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CH1787

Small Footprint Hardware Controllable 2400bps Modem

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

CH1787 Small Footprint Hardware Controllable 2400bps Modem

Parameter

Table 4. CH1787 System Data Mode Compatibility Specifications.

Specification

Parameter

Specification

Asynchronous

2400, 1200, 600bps character Receive Carrier Originate+HZ 2400Hz +7Hz

asynchronous.

0-300bps Frequencies Answer

1200Hz +7Hz

asynchronous

V.22bis, V.22, 212A

Asynchronous

Speed Range

TxD may differ +1%, -25% from

modem output. Offsets will be

corrected by adding/deleting stop

bits.

Bell 103

Answer ‘space’ 2025Hz +7Hz

Answer ‘mark’ 2225Hz +7Hz

Originate ‘space’ 1070Hz +7Hz

Originate ‘mark’ 1370Hz +7Hz

Asynchronous 8, 9, 10bits, including start, stop, Receiver Sensitivity OFF to ON threshold -43 dam

Format

parity

On to OFF threshold -48 dam

Telephone Line

Interface

Two-wire full duplex over public

switched network. On-chip hybrid

and billing delay timers.

Modulation

V.22bis, 16 point QAM at

600baud. V.22 and 2212A, 4

point, DPSK at 600baud. 103

binary phase coherent FSK.

Hysteresis

2dB minimum

Self Test Pattern

Generator

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.

Line Equalization

Fixed compromise equalization,

transmit. Adaptive equalizer for

PSK/QAM, receive.

Transmit Carrier

Frequencies

V.22bis, V.22,

212A

Originate 1200Hz +.01%

Answer 2400Hz +.01%

Diagnostics

Available

Local analog loopback.

Local digital loopback.

Request remote digital loopback.

Local interface loopback modem

with self-test.

Bell 103 mode

Originate ‘space’ 1070Hz +.01%

Originate ‘mark’ 1270Hz +.01%

Answer ‘space’ 2025Hz +.01%

Answer ‘mark’ 2225Hz +.01%

Call Progress Tones With speaker or quiet screen

Detected

messages (no dial tone, busy,

ring-back, modem answer tone

and voice).

Computer Interface IBM PX/XT/AT bus compatible

with an 8250/16450/16550A

UART as a serial controller.

2002 Cermetek Microelectronics, Inc.

Page 12

Document No. 607-0002 Revision B (03/02)

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