CH2100 데이터 시트보기 (PDF) - Cermetek Microelectronics

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CH2100

Super Small 2400bps Modem Module

Cermetek Microelectronics 

Table 6. CH2100 System Data Mode Compatibility Specifications

Parameter

Specification

Parameter

Specification

Asynchronous

2400, 1200, 600 bps character

asynchronous. 0-300 bps asynchronous

Receive Carrier Frequencies Originate

V.22 bis, V.22, 212A

Answer

2400Hz + 7Hz

1200Hz + 7Hz

Asynchronous

Speed Range

TxD may differ +1%, -2.5% from modem

output. Offsets will be corrected by

adding/deleting stop bits.

Bell 103

Answer 'space'

Answer 'mark'

Original 'space'

Original 'mark'

2020Hz + 7Hz

2225Hz + 7Hz

1070Hz + 7Hz

1270Hz + 7Hz

Telephone Line

Interface

Two-wire full duplex over public switched

network. On-chip hybrid and billing delay

timers.

Billing Delay

2.0 to 3.0 seconds (Ta=25OC)

Modulation

V.22 bis, 16 point QAM at 600 baud. V.22

and 2212A, 4 point, DPSK at 600 baud.

103 binary phase coherent FSK.

Hysteresis

2 dB 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.22 bis, V.22,

212A

Originate 1200Hz+.01%

Answer 2400Hz +.01%

Diagnostics

Available

Local analog loopback.

Local digital loopback.

Remote digital loopback.

Request remote digital loopback.

Local interface loopback modem with

self test.

Bell 103 mode

Originate 'space'

Originate 'mark'

Answer 'space'

Answer 'mark'

1070Hz +.01%

1270Hz +.01%

2020Hz +.01%

2225Hz +.01%

Call Progress

Tones Detected

Computer Interface

With speaker or quiet screen

messages

(no dial tone, busy, ring-back, modem

answer tone and voice).

IBM PC/XT/AT bus compatible with an

8250/16450/16550A UART as a serial

controller.

Table 7. CH2100 Electrical Specifications

Ta=25oC

Symbol

Vcc

Icc

V OL

V OH

V IL

V IH

IIN

CP

C haracteristic

Supply voltage

Supply Current

Off hook operating current

On hook operating current

Power down operating current

Output Low Voltage

(IOL=20mA) RI

(IOL=2.0mA) RI.

RXD (IOL=1.6mA)

Output High Voltage

(IOH=-20mA) RI

(IOH=-2.0mA) RI

RXD (IOL=-100mA)

Input Low Voltage

RST

TXD

Input High Voltage

RST

TXD

Input Leakage Current

RST, TXD, RXD

Capacitive Load

RST, TXD, RXD

M in .

4.75

Ty p .

5.0

Max.

5.25

U nits

V

40

mA

32

mA

7

mA

0.10

V

0.1

0.26

V

0.40

V

4.40 4.50

V

4.18 4.37

V

2.40

V

-0.30

-0.30

0.80

V

0.80

V

3.5

V

2.0

V

100.0

uA

10.0

pF

1999 Cermetek Microelectronics, Inc.

Document No. 607-2100 Rev. C (8/99) 8

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