CH1847/D Data Access Arrangement Module
V.34bis High Speed DAA Module with Output Squelch
INTRODUCTION
FEATURES
The Cermetek CH1847/D Data Access Arrangement
(DAA) product family is an FCC Approved DAA. The
user does not need to register this DAA when properly
designed in. Registration is convey to the user. A
FCC label is provided with each unit for monitoring on
the outside of the users product.
The device is
designed to meet the performance requirements of
sets.
33.6Kbps modems, such as V.34bis, for embedded
applications. The CH1847/D meets or exceeds the
requirements for V.34 and can be used in lower speed
applications as well. The isolation voltage and surge
protection meets, as a minimum, meet UL60950
Revision 1 (USA) and CSA C22.2 950 (Canada)
Compliant. See UL File E104957.
requirements. Further, the CH1847/D is FCC Part 68
(TIA/EIA/IS-968) and Industry Canada (IC) CS-03 Part
I approved.
The CH1847/D is compatible with all popular V.32bis
FAX chip sets. Application examples are included in
this datasheet.
The CH1847/D offers a Quick-to-
and V.22.
Market DAA solution with its conveyed FCC Part 68
approval.
US:B46MMO1BCH1847.
The CH1847/D is exceptionally well suited for voice-
over-data (VoIP) and other internet-based telephony
and data communication applications and is pin
compatible with the CH1840 product family.
Figure 1. CH1847/D Functional Block Diagram.
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0021 Revision A (04/05)
Cermetek Microelectronics, Inc.
CH1847/D Data Access Arrangement Module
DESCRIPTION OF FUNCTIONAL BLOCKS
connected to power. This can be handy for designs in
AND DISCUSSION OF BASIC OPERATIONS
which power consumption is of concern.
When
Figure 1 contains a functional block drawing of the
circuited in this manner, there is virtually no current
CH1847/D. Each CH1847/D product consists of:
draw until a ring signal is present. Refer to Figure 3.
1. Isolation Barrier.
2. Ring Detection.
RI Output:
Opt coupler, 30K Ω pull-up, Active
3. Phone Line Control/Off-Hook Switch.
LOW
4. PSTN Line Surge and High Voltage Protection
Square wave 15-68HZ (TIP. 20Hz)
circuitry.
Sensitivity: 38Vrms across TIP and RING
5. 2-to-4 Wire Conversion circuit.
6. Caller ID (CID).
Phone Line Control/Hook Switch. The OFFHK input
7. XMIT Squelch.
is used to toggle the CH1847/D from On-Hook to Off-
Hook and back to On-Hook. When the OFFHK input is
Ring Detection. To announce an incoming call, the
TTL Low, the CH1847/D is On-Hook. The On-Hook
telephone company’s central office (CO) applies an
state indicates to the CO that the CH1847/D is ready
AC ringing signal to the PSTN line. The CH1847/D is
to receive calls.
designed to detect this signal. The CH1847/D uses
the AC ring signal to produce a square wave pulse
When the OFFHK input is TTL High, the CH1847/D is
train output at the CH1847/D RI pin. This pulse train is
Off-Hook. The Off-Hook state indicates to the CO that
the same frequency as the incoming AC ring signal
the CH1847/D is either answering a call or preparing
and is typically 20 Hz.
Figure 3 shows external
to place a call.
filtering which may be employed to provide an
envelope indication of the ring signal using the
CH1847/D RI output. The ring detection circuit in the
OFFHK Input:
Active HIGH
CH1847/D family is designed to deter false indications
OFFHK active Current: 5mA
caused by pulse dialing or noise on the PSTN line.
2-Wire to 4-Wire Hybrid Converter. This circuit block
Additionally, the RI output of the CH1847/D is diode
performs two functions:
protected thereby allowing an external pull-up resistor
1. It applies the XMIT signal to the PSTN line, and
(R>100k ohms) to +5V to be utilized to activate the
2. It subtracts the XMIT signal from the total signal
ring detection circuit when the CH1847/D is not
present on the PSTN line thereby deriving the
RCV signal.
Figure 2. Typical Application.
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CH1847/D Data Access Arrangement Module
the XMIT(+) pin must be connected to GND through a
0.1 µ F capacitor.
CH1847. The CH1847 attenuates the transmit signal
by 9dBm before it applies the signal across TIP and
RING. Therefore, a transmit signal of 0dBm applied
between XMIT(-) and XMIT(+) will comply with the
FCC Part 68 TIP and RING maximum data output
requirement of –9dBm.
CH1847D.
The CH1847D does not attenuate the
transmit signal before it applies the signal across TIP
and RING.
Therefore, a transmit signal of –9dBm
applied between XMIT(-) and XMIT(+) will comply with
the FCC Part 68 TIP and RING maximum data output
requirement of –9dBm.
Figure 3. Low Power Ring Detection Circuit.
The accuracy of the RCV signal derivation depends on
RECEIVE SIGNALS
how closely the impedance of the PSTN line matches
The incoming analog signal appears across TIP and
an ideal 600 Ohms. Generally, a small amount of the
RING. The CH1847/D does not amplify the receive
XMIT signal will appear at RCV due to the non-ideal
signal. Receive signals can vary from a maximum
nature of the PSTN line impedance. The ratio of the
strength of -9dBm to below -50dBm for data and from
applied XMIT signal to the received XMIT signal is
0dBm to below -50dBm for incoming DTMF tones and
called Trans-Hybrid Rejection, or Trans-Hybrid Loss.
voice.
Isolation
Barrier/PSTN
Line
Isolation
and
RCV. The CH1847/D derives the incoming signal and
Surge/Peak Voltage Protection.
The
Public
presents it at RCV with respect to GND. The user
Switched Telephone Network (PSTN) line isolation
must AC couple RCV through a 0.1 µ F capacitor as
barrier circuitry provides isolation and the required
indicated in Figure 3.
surge and high voltage protection.
This circuitry
effectively isolates the user’s equipment from both the
Attenuation:
0.0dBm
PSTN line and the CO.
The CH1847/D has been
designed to meet both FCC Part 68 (USA) and
Input Impedance:
150K Ω
Industry Canada CSA CS-03 Part I (Canada) isolation
Typical Input Signal:
0dBm or 0.775Vrms with the
and surge requirements when circuited as indicated in
Signal referenced to GND and
Figure 5. Among the more critical parameters, the
AC coupled
PSTN isolation barrier will provide at least 1500VAC
RMS isolation and 2122V peak surge protection. The
CH1847/D is also UL60950 Revision 1 listed and
CALLER ID
meets CSA C22-950 test conditions when connected
The CH1847/D will detect Caller ID (i.e., CID)
as indicated in Figure 5.
information. CID data, when supplied by the local
telephone service provider, is present between the
Caller ID (CID).
The CID circuit maintains the
first and second incoming ring signals.
required Isolation Barrier, PSTN Line Isolation and
Surge/Peak Voltage Protection while providing the
Setup.
CID does not require additional external
encoded CID signal to the user via the RCV pin.
circuitry to access the encoded CID data but it does
require external circuitry to process the encoded
signal.
TRANSMIT SIGNALS
For differential operation, the outgoing analog signal is
Operation. The CID signal is always provided by the
applied between XMIT(-) and XMIT(+).
This signal
CH1847/D when supplied by the PSTN.
The
must be AC coupled through a 0.1 µ F capacitor
encoded CID data will appear on RCV relative to
present on both the XMIT(-) and XMIT(+) pins as
GND. The user must decode the data. Refer to
shown in Figure 2.
Application Note # 176, Caller ID Feature for
CH1847/D DAA, for details concerning CID signal
For single-ended operation, the outgoing analog signal
decoding.
is applied to the XMIT(-) pin with respect to GND. This
signal must be AC coupled using a 0.1 µ F capacitor as
shown in Figure 2. In single ended signal operation,
2005 Cermetek Microelectronics, Inc.
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CH1847/D Data Access Arrangement Module
UL RECOGNITION
HANDLING
AND
ASSEMBLY
To further protect the end product containing the
RECOMMENDATIONS
CH1847/D from field failures caused by large
The CH1847/D DAA Module contains static-sensitive
transients present on poor quality PSTN lines and to
components and should only be handled by personnel
maintain UL recognition, an additional level of external
and in areas that are properly protected against static
transient protection is required. Refer to Figure 5 for
discharge.
Industry standard ESD and EOS
mandatory additional protection circuitry.
procedures and precautions should be observed when
handling CH1847/D products.
DESIGN CONSIDERATIONS
The CH1847/D DAA includes circuitry that couples the
MOUNTING THE DAA
modem signals to the PSTN line and provides the FCC
There are two mounting techniques recommended for
required voltage isolation and surge protection when
physically connecting the CH1847/D DAA to a PCB:
circuited per Figure 5 herein.
Cermetek offers the
1. Direct soldering.
following
end
product
design
guidelines
as
2. Sockets.
suggestions only. These guidelines are intended to
facilitate the usage of Cermetek DAA modules and to
Direct Soldering.
The CH1847/D may be wave
assist the user with FCC certification of their end
soldered onto a circuit card. All CH1847/D products
product.
are hermetically sealed and will not be harmed by
industry standard wave soldering processes.
1. Mount the DAA in the final assembly so that it is
isolated from exposure to any hazardous voltages
To avoid the problems of flux contamination, hand
within the assembly.
Adequate separation and
soldering is preferred to wave soldering.
When
restraint of cables and cords must be provided.
cleaning, use only demonized water.
2. Connect to the PSTN line through a standard FCC
Socketing.
The socketing approach to mounting
approved RJ-11C jack or equivalent. For RJ-11,
eliminates cleaning and desoldering concerns. When
use the two center pins .
the socket is used, it must make a solid connection to
all pins.
Failure to do so will cause unreliable or
3. All PCB traces from the CH1847/D TIP and RING
intermittent operation.
pins must be at least 0.1 inch spacing from all
other traces or other conducting material.
The
When using sockets, steps should be taken to assure
purpose for this spacing is to maintain 1500 VC
that the DAA module remains tightly seated in the
isolation between the incoming PSTN line and the
socket after the end product is shipped.
It is
other traces. PSTN related PCB Traces should
recommended that some type of mechanical restraint
have a width of 0.020 inches or greater.
be provided to keep the CH1847/D seated to avoid
any possibility that the CH1847/D works loose during
4. TIP and RING PCB traces should be as short as
shipment. See Application Note # 130, Summary of
possible and should be oriented to prevent direct
Recommended Suppliers for a list of recommended
or induced coupling with other signals present on
socket manufacturers.
the PCB.
5. The CH1847/D processes signals in the millivolt
FCC (USA) AND IC (INDUSTRY CANADA)
range. Even though the CH1847/D is designed to
REGISTRATION
handle noise in the power supply, steps should be
The CH1847/D has been approved by the FCC (USA)
taken to assure that the noise level does not
and the IC (Industry Canada). The user is assigned
exceed 50 mV peak-to-peak. Particular attention
the registration upon purchase of the CH1847/D.
should be paid to both the power supply and the
However, because Cermetek does not have influence
ground line PCB traces.
over nor knowledge of the specific user application
environment, the user assumes all risk for maintaining
6. For data calls, FCC Part 68 rules require silence
compliance to registration for FCC and IC Approved or
on the PSTN line for at least 2 seconds after a
Approvable end products .
data call has been completed to allow central
offices to exchange billing information. Further,
The
PSTN
interface
connectivity
requirements
Part 68 specifies that the transmit level must not
specified in Figure 5 should be adequate to maintain
exceed -9dBm.
FCC and IC Approval for most applications, but, as
applications vary, the user is encouraged to submit the
7. For voice calls, the FCC rules require that the end
end product or system to a reputable independent test
product must meet the requirements of Part 68 for
facility for evaluation and approval verification. The
Out-of-Band Energy, and DTMF Transmit Levels.
2005 Cermetek Microelectronics, Inc.
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CH1847/D Data Access Arrangement Module
test/evaluation process involves testing the end
Telephone Company Procedures. The goal of the
system and reviewing the resultant data.
telephone company is to provide you with the best
service it can. In order to do this, it may occasionally
be necessary for them to make changes in their
MAINTAINING FCC REGISTRATION
equipment, operations or procedures.
If theses
All CH1847 products are registered with the FCC
changes might affect your service or the operation of
(Federal Communications Commission) under Part 68
your equipment, the telephone company will give you
and IC (Industry Canada) CS-03 Part I. To maintain
notice, in writing, to allow you to make any changes
the validity of the registration, the end product
necessary to maintain uninterrupted service.
manufacturer must serve notice to the end user of its
products of several restrictions the FCC places on the
In certain circumstances, it may be necessary for the
DAA and its use.
telephone company to request information from you
concerning the equipment which you have connected
In addition to restriction notification, the FCC requires
to your telephone line. Upon request of the telephone
that Cermetek make all repairs to all products in the
company, provide the FCC registration number and
CH1847 family.
If repairs are necessary after
the ringer equivalence number (REN); both of these
installation of the CH1847 in the end product and the
items are listed on the equipment label. The sum of all
end product has been delivered to the end user, the
of the REN’s on your telephone lines should be less
end product must be returned to the end product
than five in order to assure proper service from the
supplier where the CH1847 can be removed and then
telephone company. In some cases, a sum of five
forward to Cermetek for repair. The following notice is
may not be useable on given line.
Consult your
recommended and should be included in the end
telephone provider.
product’s user manual.
If Problems Arise .
If any of your telephone
equipment is not operating properly, you should
FOR YOUR USER’S MANUAL
immediately remove it from your telephone line, as it
The FCC Part 68 rules require the following (or
may cause harm to the telephone network.
If the
equivalent) be provided to the end user of equipment
telephone company notes a problem, they may
containing a DAA.
temporarily discontinue service. When practical, they
will notify you in advance of this disconnection.
If
Type of Service . The (insert end product name) is
advance notice is not feasible, you will be notified as
designed to be used on standard device telephone
soon as possible.
lines. It connects to the telephone line by means of a
standard jack called the USOC RJ-11C (or USOC
When you are notified, you will be given the
RJ45S). Connection to telephone-company-provided
opportunity to correct the problem and informed of
coin service (central office implemented systems) is
your right to file a complaint with the FCC. Contact
prohibited. Connection to party lines service is subject
your local telephone service provider if you have nay
to state tariffs.
questions about your phone line.
Changes in Attestation Procedure for Plugs and
In the event repairs are ever needed on the (insert
Jacks. (Name of applicant) attests that the network
your product name), they should be performed by
interface plugs or jacks used on this equipment comply
(insert your company name) or an authorized
with and will continue to comply with the mechanical
representative of (insert your company name). For
requirements specified in Part 68, sub-part F,
information contact: (insert your company address).
specifically the dimensions, tolerances and metallic
plating requirements.
The compliance of these
connectors will be assured by purchase specifications
and incoming inspection.
Documentation of such
specifications and/ or inspections will be provided to
the FCC within 30 days of their request for the same.
2005 Cermetek Microelectronics, Inc.
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CH1847/D Data Access Arrangement Module
Table 1. CH1847/D Pin Descriptions.
PIN
I/O
CH1847/D
FUNCTION
1
I/O
TIP
TIP. Direct PSTN line connection.
2
I/O
RING
RING. Direct PSTN line connection.
3
---
N/C
No Pin. Pin location 3 does not contain a pin. This pin location is left blank to
provide maximum voltage isolation between TIP/RING and the rest of the
CH1847/D pins.
4
I
OFFHK
OFF-HOOK. Used to toggle CH1847/D product between On-Hook and Off-Hook.
When set LOW, CH1847/D is On-Hook. When set HIGH, CH1847/D is set Off-
Hook to answer or place a call. See Note 1.
5
O
RI
RING INDICATION. Indicates the presence of a ring signal between TIP and RING
pins. RI output is a square wave coincident with the incoming AC ring signal. The
RI square wave output can be conditioned to produce an envelope of the incoming
AC ring signal by using the circuit in Figure 4.
6
O
RCV
RECEIVE. Audio output signal with respect to GND. AC couple RCV through
0.1 µ F capacitor to eliminate any DC offset.
7
I
XMIT(-)
TRANSMIT(-). Audio input signal.
AC couple through 0.1 µ F capacitor.
The
CH1847/D can be used in differential mode with respect to XMIT(+) or in single
ended mode with respect to GND.
8
I
V CC
POWER SUPPLY. +5V ± 5%. Supply line noise should be less than 50mV peak to
peak.
9
I
XMIT(+)
TRANSMIT(+). Audio input signal for CH1847/D when used in differential mode
only. Connect to GND through 0.1 µ F capacity when CH1847/D used in single
ended input via XMIT(-).
10
I
GND
GROUND. Supply line noise should be less than 50mV peak to peak.
Note:
When answering incoming calls in response to a ring indication on RI, internal component degradation may
result if OFFHK is set HIGH before RI returns to its HIGH state.
2005 Cermetek Microelectronics, Inc.
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CH1847/D Data Access Arrangement Module
Figure 4. Pin and Configuration Comparison Summary for CH1837, CH1837A, CH1840 and CH1847 Product
Families.
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CH1847/D Data Access Arrangement Module
Table 2. CH1847/D Electrical Specifications.
Page 1 of 2
T A = 0°C to 55°C unless otherwise specified
Parameter
Conditions
Min.
Typ.
Max.
Units
Logic
Input HIGH
2.4
V
Input LOW
0.4
V
Input Leakage HIGH
500
µ A
Input Leakage LOW
-500
µ A
Output HIGH
IOH=0.05mA
3.0
V
Output LOW
IOL=2.0mA
0.4
V
Isolation Protection
Between TIP and RING
CH1847/D
1500
VAC RMS
Surge Protection
Between TIP and RING
CH1847/D
2212
V Peak
Transmission Insertion Loss
1800Hz, 600ohms, 35mA loop current
CH1847
9.5
10
10.5
dB
CH1847D
-0.5
0.0
0.5
dB
Frequency Response
(Ref=1800Hz Transit)
200-4kHz
-0.3
+0.3
dBm
Distortion Noise-Transmit
-10dBm transmit power (600Hz)
-82
dBm
Receive Gain
Gain between PSTN line and receive output -0.5
0
+0.5
dB
at 1800Hz with 600 ohm resistive termination
(flat from 300-4kHz)
Receive Frequency Response
(Ref = 1800Hz Receive)
200-4kHz
-0.3
+0.3
dBm
2005 Cermetek Microelectronics, Inc.
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CH1847/D Data Access Arrangement Module
Table 2. CH1847/D Electrical Specifications.
Page 2 of 2
T A = 0°C to 55°C unless otherwise specified
Parameter
Conditions
Min.
Typ.
Max.
Units
Receive 2nd/3rd/4th
-10dB at TIP and RING
-82
dBm
Harmonic Distortion
Noise-Receive
400Hz-4kHz
-82
dBm
PSTN Line Input Impedance
At 1800Hz
550
600
650
Ohm
On-Hook Impedance
20
mOhms
Loop Current
48VDC from TIP to RING.
20
100
mA
Longitudinal Balance
OH=0 (On-Hook)
66
dBm
OH=1 (Off-Hook)
66
dbm
Return Loss
1kHz
25
dBm
(Zref=600ohm, 2.16 µ F)
Trans-Hybrid Loss
Attenuation between the transmitter input
22
30
dB
and receiver output at 1kHz with 600ohm
complex termination
Transmit Input Impedance
Measured at XMIT @ 1800Hz
120
150
200
kOhm
Receive Output Impedance
Measured at RCV @ 1800Hz
10
100
Ohms
Ring Select Sensitivity
AC voltage between TIP and RING
38
Vrms
Hook Switch Control Current
Drive capable of sourcing current
4
mA
Supply Current
VCC=+5VDC ± 5%, Off-Hook
8
mA
VCC=+5VDC ± 5%, On-Hook
5
mA
Ringer Equivalence
Type A
0.2A
REN
Caller ID
Single Level
-0
dB
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CH1847/D Data Access Arrangement Module
Figure 5. PSTN Line Interface.
1. Current Limiting PSTN Protection Line Device.
IMPORTANT NOTE
Current limiting devices are mandatory to meet UL
Do NOT use both D1 and D2 in the external
safety standards. The current limiting components
protection circuitry. Use either D1 (recommended
identified as F1 and F2 in dashed Box 1 must also
for typical applications) or D2 (recommended for
survive FCC Part 68 surge testing.
Refer to
severe applications).
Cermetek Application Note #126, Supplemental
PSTN Line Protection, for more details. Refer to
Application Note # 130, Summary of Recommend
4. EMI/RFI Suppression.
Suppliers, for a list of suppliers and associated part
Suppression of emitted EMI/RFI is recommended
numbers.
and is typically required to obtain FCC part 15 A
and/or B approval. EMI/RFI suppression circuitry is
A resettable/repairable fuse (rated at 0.15 amps) is
also used to suppress reception of externally
preferred because it resets automatically upon
generated EMI/RFI signals, such as strong radio
removal of the current flow. Non-resettable devices
signals which are known to adversely affect modem
are also acceptable.
Although CS-03 Part I
operation, should the end product containing the
(Canada) follows the requirements of FCC Part 68
CH1847/D be located near a source of such
(USA),
Cermetek
recommends
contacting
a
signals. Typical EMI/RFI suppression circuitry may
certified independent lab to verify compliance in the
be added as described below:
specific application.
A. To provide adequate EMI/RFI suppression, the
capacitor/inductor network contained in dashed
2. Over Voltage and Lightning Protection.
Box 4 should be located as close to the RJ-11C
The purchaser must include some form of surge
Jack as possible. Further, this network should
protection as described herein to maintain FCC
be provided with an excellent ground path to
Part 68 and CS-03 part I approval. This protection
the chassis.
MUST be provided by external circuitry. Refer to
Application Note #130 for a list of recommended
B. Capacitors C1 and C2 should not exceed
suppliers.
0.005 µ f. They must have a rating of 1.5KV and
As a minimum, the surge protection identified as D1
typically are 0.001 µ f ± 20%. Inductors L1 and
in dashed Box 2 must be provided.
L2 may be either individual inductors or a dual
inductor. Refer to Application Note #130 for a
3. Optional External Over Voltage and Lightning
complete list of recommended vendors and
Protection.
associated part numbers. For UL applications,
In most environments, the two terminal surge
choose capacitors and inductors that are UL
suppressor described above (and indicated as D1
60950 Revision 1 listed. The actual values of
in dashed Box 2) is adequate.
For severe
the components used may vary depending on
environments, use a three terminal device with an
the end product design and the nature of the
earth ground as is shown in dashed Box 3 in place
EMI/ RFI. Consult an FCC part 15 consultant if
of the two terminal device in dashed Box 2.
required.
2005 Cermetek Microelectronics, Inc.
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CH1847/D Data Access Arrangement Module
Table 3. Summary CH1847/D Family Product Features.
Model
Summary of Features
Operating Temperature
CH1847
33.6kbps DAA, -9dbm Output Attenuation, FCC Part 68 Approved
0 ° C to +70 ° C
(USA), Industry Canada (IC) CS-03 Part I Approved, UL60950 Revision
1 Listed (USA) and CSA C22.2 950 (Canada) compliant.
CH1847 ET
33.6kbps DAA, -9dbm Output Attenuation, FCC Part 68 Approved
-40 ° C to +85 ° C
(USA), Industry Canada (IC) CS-03 Part I Approved, UL60950 Revision
1 Listed (USA) and CSA C22.2 950 (Canada) compliant.
CH1847D
33.6kbps DAA, 0dbm Output Attenuation, FCC Part 68 Approved (USA),
0 ° C to +70 ° C
Industry Canada (IC) CS-03 Part I Approved, UL60950 Revision 1 Listed
(USA) and CSA C22.2 950 (Canada) compliant.
CH1847D ET 33.6kbps DAA, 0dbm Output Attenuation, FCC Part 68 Approved (USA),
-40 ° C to +85 ° C
Industry Canada (IC) CS-03 Part I Approved, UL60950 Revision 1 Listed
(USA) and CSA C22.2 950 (Canada) compliant.
Notes:
1. Pins are 0.010 inches X 0.020 inches.
*2. Nominal pin length is 0.200 inches.
3. Nominal case tolerance ± 0.02 inches.
4. Nominal pin tolerance ± 0.03 inches.
Figure 6.
CH1847/D Physical Dimensions.
Cermetek reserves the right to make changes in specifications at any time and without notice. The information furnished by
Cermetek in this publication is believed to be accurate and reliable. However, Cermetek assumes no responsibility for its use, or for
any infringements of patents or other rights of third parties resulting from its use. No license is granted under any patents or patent
rights of Cermetek.
Cermetek provides the user with a FCC (USA) and IC (Canada) Approved or device. However, Cermetek does not have influence
over nor knowledge of the specific user application environment. Therefore, for FCC and IC Approved or Approvable devices, the
user assumes all risk for maintaining compliance to registration.
Printed in U.S.A
1390 BORREGAS AVENUE | SUNNYVALE CA 94089 | LOCAL: 408-752-5000 | TOLL FREE: 1-800-882-6271 | FAX: 408-752-5004
CERMETEK WEB SITE: http://www.cermetek.com | EMAIL: sales@cermetek.com
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0021 Revision A (04/05)