CH1788ET 데이터 시트보기 (PDF) - Cermetek Microelectronics

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CH1788ET

Surface Mount PLCC 2400bps Modem

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

CH1788 Surface Mount PLCC 2400bps Modem

Parameter

Asynchronous

Asynchronous

Speed Range

Asynchronous

Format

Telephone Line

Interface

Transmit level

Self Test Pattern

Generator

Transmit Carrier

Frequencies V.22

bis, V.22, 212A

Bell 103

Table 7. CH1788 System Data Mode Compatibility Specifications.

Specification

Parameter

Specification

2400, 1200 bps character Receive Carrier Originate 2400Hz ± 7Hz

asynchronous.

Frequencies

Answer 1200Hz ± 7Hz

300 bps asynchronous

V.22 bis, V.22,

212A

TXD may differ +/-2.5% from Bell 103

Answer ‘space’ 2020Hz ± 7Hz

modem output. Offsets will be

Answer ‘mark’ 2225Hz ± 7Hz

corrected by adding/ deleting stop

Originate ’space’ 1070Hz ± 7Hz

bits.

Originate ‘mark’ 1270Hz ± 7Hz

10 bits, including start, stop, Receiver

Carrier detect ON threshold

parity.

Sensitivity

-43dBm

Carrier detect OFF threshold

-48dBm

Two-wire full duplex over public Billing Delay

2.0 to 3.0 seconds

switched network. On-chip hybrid

and billing delay timers.

V.22 bis, 16 point QAM at 600 Power

-9.6dB max-QAM

baud. V.22 and 212A, 4 point

-7.4dB max.-DPSK

DPSK at 600 baud. 103 Binary

-5.3dB max-FSK

phase coherent FSK.

Alternate ‘ones’ and ‘zeros’ and Line

Fixed compromise equalization,

error detector, to be used along Equalization

transmit. Adaptive equalizer for

with most loopbacks. A number

DPSK/QAM, receive.

indicating the bit errors detected

is sent to DTE.

Originate 1200Hz ± .01%

Diagnostic

Local analog loopback.

Answer 2400Hz ± .01%

Available

Local analog loopback.

Remote digital loopback.

Request remote digital loopback.

Local interface loopback modem

with self-test.

Originate ’space’ 1070Hz ± .01% Call Progress

With speaker or quiet screen

Originate ‘mark’ 1270Hz ± .01% Tones Detected messages (No dial tone, busy,

Answer ‘space’ 2020Hz ± .01%

ring-back, modem answer tone

Answer ‘mark’ 2225Hz ± .01%

and voice).

Computer

Interface

2003 Cermetek Microelectronics, Inc.

Page 21

Document No. 607-0018 Revision A2 (07/03)

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