CH1837A Datasheet, PDF (1/9 Pages) List of Unclassifed Manufacturers – CH1837A/7F/8A Data Access Arrangement Module V.34bis High Speed DAA Module

CH1837A/7F/8A Data Access Arrangement Module
V.34bis High Speed DAA Module
INTRODUCTION
The Cermetek CH1837A/F Data Access Arrangement
(DAA) is designed to meet the performance
requirements of 33.6Kbps modems, such as V.34bis,
for embedded applications. The CH1837A/F 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, North
American UL1950 Edition 3 (USA) and CSA C22.2
950 (Canada) requirements. Further, the CH1837A/F
has been tested to meet FCC Part 68 and is Canadian
DOT CSA CS-03 Part I approvable.
The CH1837A/F is compatible with all popular V.34bis
modem/fax chip sets. Application examples are
included in this datasheet. The CH1837A/F offers a
Quick-to-Market DAA solution for high performance
modem designs.
The CH1837A/F is exceptionally well suited for voice-
over-data (VoIP) and other internet-based telephony
and data communication applications.
For those applications not requiring a two to four wire
hybrid converter circuit, the CH1838A provides all the
features of the CH1837A/F (except the hybrid
converter) while offering some cost savings. Note that
the CH1838A is a special order product only. Consult
Cermetek for availability and delivery.
FEATURES
• Low Profile
• Complete DAA function
• Compatible with most popular V.34bis modem chip
sets
• Ring detection circuitry included
• Built-in 2-wire to 4-wire conversion circuitry
(CH1837A/F only)
• UL1950 Edition 3 Listed and CSA C22.2 950
Compliant
• 1500 VAC RMS Isolation
• 2122V peak surge protection
• +5V low power operation
• Differential transmission, VoIP applications
• Compatible with V.34bis, V.32bis, V.32, V.22bis,
and V.22
• FCC Part 68 (USA) and DOT CSA CS-03 Part I
(Canada) Approvable
DESCRIPTION OF FUNCTIONAL BLOCKS
AND DISCUSSION OF BASIC OPERATIONS
Figure 1 contains a functional block drawing of the
CH1837A/F. Each CH1837A/F product consists of:
1) Isolation barrier.
2) Off-Hook Switch/Ring Detect circuit.
3) PSTN Line Surge and High Voltage Protection
circuitry.
4) 2-to-4 Wire Conversion circuit.
V_cc
VND
ISOLATION
XMIT+
XMIT-
RCV
RI
OFFHK
T1
T2
HYBRID
2W/4W
CONVERTER
SURGE AND
PROTECTION
CIRCUITRY
TIP
RING
OFF HOOK
SWITCH
RING DET.
Figure 1. Function Block Diagram of CH1837A/F.
Figure 2 contains a functional block drawing of the
CH1838A. Each CH1838A product consists of:
1) Isolation Barrier.
2) Off-hook Switch/Ring Detect circuit.
3) PSTN Line surge and High Voltage Protection
Circuitry.
V_cc
VND
ISOLATION
SURGE AND
PROTECTION
CIRCUITRY
TIP
RING
T2
N/C
N/C
T1
RI
OFFHK
OFF HOOK
SWITCH
RING DET.
Figure 2. Function Block Diagram of CH1838A.
2002 Cermetek Microelectronics, Inc.
Page 1
Document No. 607-0014 Revision C2 (12/02)