CH1787 データシートの表示（PDF） - Cermetek Microelectronics

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CH1787

Small Footprint Hardware Controllable 2400bps Modem

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

CH1787 Small Footprint Hardware Controllable 2400bps Modem

Symbol

VCC

ICC

VOL

VOH

VIL

VIH

VT+

VT-

Table 5. CH1787 Electrical Specifications.

Ta=25°C

Characteristic

Min.

Typ.

Supply voltage

4.75

5.0

Supply Current

Off hook operating current

50

On hook operating current

40

Power down operating current

16

Output Low voltage

(IOL=0.4mA) CON

(IOL=5.0mA) DIR

(IOL=1.6mA) SLEEP, DSR, DCD, HS, RXD

(IOL=4mA) V/D

Output High Voltage

(IOH=0.2mA) CON, DIR

(IHL=-100uA) SLEEP, DSR, DCD, HS, RXD

(IOL=0.4mA) V/D

Input Low Voltage

4.45

2.4

4.18

TST, ORG, ORA, HNG, AAR, ANS

DTR, TXD

Input High Voltage

TST, ORG, ORA, HNG, AAR, ANS

3.3

DTR, TXD

2.4

Positive Hysteresis Thresold for Reset Pin

2.7

Negative Hysteresis Thresold for Reset Pin

1.6

Max.

5.25

75

0.3

0.3

0.4

0.26

0.95

0.8

Units

V

mA

mA

mA

V

V

V

V

V

V

V

V

V

V

V

V

V

Parameter

Ring Voltage Loop

Return Loss @ 1000 Hz

Ring Frequencies

Transmit Level

Command Mode After Reset

Inter Character Delay

Command Delay

Minimum Reset Pulse

Table 6. CH1787 Electrical Specifications.

Minimum Typical Maximum Units

Comments

40

VRMS

17

dB 600Ω

15.3

68

Hz

-11

dBm 600Ω – Data Mode

5

sec Delay

20

msec Between all command characters

100

msec Between all AT commands

5

msec If user supplied

Table 7. Other Performance Specifications.

Parameter

Minimum Typical Maximum Units

DTMF Twist (Balance)

3

dB

DTMF Tone Duration

50

255

ms

Pulse Dialing Rate

10

20

pps

Pulse Dialing Make/Break

39/61

%

Pulse Dialing Make/Break

33/67

%

Pulse Interdigit Interval

700

3000

ms

Call Progress Passband Frequency

120

620

Hz

Wait Time for Dial Tone

2

255

sec

Comments

95ms default

10pps default

US, Canada default

UK, Hong Kong

789ms default

Two second default

Model

CH1787

CH1787ET

Table 8. Product Family Summary.

Feature Summary

FCC Part 68 Approved, UL1459 Registered

FCC Part 68 Approved, UL1459 Registered

Operating Temperature

0°C to +70°C

-40°C to +85°C

2002 Cermetek Microelectronics, Inc.

Page 13

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

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