Bell 202 Compatible Modem

FX614

© 1997 Consumer Microcircuits Limited

15

D/614/4

Notes

Min.

Typ.

Max.

Units

Tx 5bits/sec (M1 = '1', M0 = '0').

Bit Rate

0

5.0

5.1

Baud

Mark (Logical '1') Frequency

385

-

389

Hz

Space (Logical '0') Frequency

6

-

0

-

Hz

Data and Mode Timing

Rx Data Delay (RXIN to RXD)

9

-

2.55

-

ms

Tx Data Delay (TXD to TXOP)

9

-

0.1

-

ms

Mode ZP to Tx or Rx

10

-

-

20

ms

Mode Tx1200 to Rx1200

10

-

-

4.0

ms

Mode Rx1200 to Tx1200

10

-

-

0.2

ms

Input Amplifier

Impedance (RXIN Pin)

7

10.0

-

-

M

Ω

Voltage Gain

7

-

500

-

V/V

XTAL/CLOCK Input

'High' Pulse Width

8

100

-

-

ns

'Low' Pulse Width

8

100

-

-

ns

Notes:

1.

At 25

°C, not including any current drawn from the FX614 pins by external circuitry other than

X1, C1 and C2.

2.

3.

different signal level ranges the voltage gain of the Rx Input Amplifier should be adjusted by

selecting the appropriate external components as described in section 1.6.1

4.

Flat noise in 200 - 3200Hz band.

5.

6.

7.

Open loop, small signal low frequency measurements.

8.

Timing for an external input to the XTAL/CLOCK pin.

9.

Assuming data retiming is not enabled.

10. Delay from mode change to reliable data at TXOP or RXD pins.