CH1788 Cermetek Microelectronics, CH1788 Datasheet - Page 21

• Manufacturer Part Number: CH1788
• Manufacturer: Cermetek Microelectronics

Specifications of CH1788

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Cermetek Microelectronics, Inc.
Asynchronous
Asynchronous
Speed Range
Asynchronous
Format
Telephone
Interface
Transmit level
Self Test Pattern
Generator
Transmit
Frequencies V.22
bis, V.22, 212A
Bell 103
2006 Cermetek Microelectronics, Inc.
Parameter
Carrier
Line
2400,
asynchronous.
300 bps asynchronous
TXD may differ +/-2.5% from
modem output.
corrected by adding/ deleting stop
bits.
10 bits, including start, stop,
parity.
Two-wire full duplex over public
switched network. On-chip hybrid
and billing delay timers.
V.22 bis, 16 point QAM at 600
baud.
DPSK at 600 baud. 103 Binary
phase coherent FSK.
Alternate ‘ones’ and ‘zeros’ and
error detector, to be used along
with most loopbacks. A number
indicating the bit errors detected
is sent to DTE.
Originate 1200Hz ± .01%
Answer
Originate ’space’ 1070Hz ± .01%
Originate ‘mark’
Answer
Answer
Table 7. CH1788 System Data Mode Compatibility Specifications.
V.22 and 212A, 4 point
1200
Specification
‘space’ 2020Hz ± .01%
‘mark’
2400Hz ± .01%
bps
1270Hz ± .01%
Offsets will be
2225Hz ± .01%
character
Page 21
Receive Carrier
Frequencies
V.22 bis, V.22,
212A
Bell 103
Receiver
Sensitivity
Billing Delay
Power
Line
Equalization
Diagnostic
Available
Call Progress
Tones Detected
Computer
Interface
Parameter
CH1788 Surface Mount PLCC 2400bps Modem
Originate 2400Hz ± 7Hz
Answer
Answer
Answer
Originate ’space’ 1070Hz ± 7Hz
Originate ‘mark’
Carrier detect ON threshold
-43dBm
Carrier detect OFF threshold
-48dBm
2.0 to 3.0 seconds
-9.6dB max-QAM
-7.4dB max.-DPSK
-5.3dB max-FSK
Fixed compromise equalization,
transmit.
DPSK/QAM, receive.
Local analog loopback.
Local analog loopback.
Remote digital loopback.
Request remote digital loopback.
Local interface loopback modem
with self-test.
With speaker or quiet screen
messages (No dial tone, busy,
ring-back, modem answer tone
and voice).
Document No. 607-0018 Revision A6 (01/06)
‘space’ 2020Hz ± 7Hz
‘mark’
Specification
1200Hz ± 7Hz
Adaptive equalizer for
2225Hz ± 7Hz
1270Hz ± 7Hz