FX614 Consumer Microcircuits Limited, FX614 Datasheet - Page 15

• Manufacturer Part Number: FX614
• Description: Bell 202 Compatible Modem Fx614
• Manufacturer: Consumer Microcircuits Limited

Bell 202 Compatible Modem
Tx 5bits/sec (M1 = '1', M0 = '0').
Data and Mode Timing
Input Amplifier
XTAL/CLOCK Input
Notes:
1997 Consumer Microcircuits Limited
Bit Rate
Mark (Logical '1') Frequency
Space (Logical '0') Frequency
Rx Data Delay (RXIN to RXD)
Tx Data Delay (TXD to TXOP)
Mode ZP to Tx or Rx
Mode Tx1200 to Rx1200
Mode Rx1200 to Tx1200
Impedance (RXIN Pin)
Voltage Gain
'High' Pulse Width
'Low' Pulse Width
1. At 25 C, not including any current drawn from the FX614 pins by external circuitry other than
2. TXD, RXEQ and CLK inputs at V
3. Measured at the Rx Input Amplifier output (pin RXFB) for 1200Hz and V
4. Flat noise in 200 - 3200Hz band.
5. Relative to 775mVrms at V
6. TXOP held at approximately V
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.
X1, C1 and C2.
The internal threshold levels are proportional to V
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
DD
= 5.0V for load resistances greater than 40k .
DD
SS
/2.
, M0 and M1 inputs at V
15
Notes
10
10
10
6
9
9
7
7
8
8
DD
10.0
Min.
385
100
100
0
-
-
-
-
-
-
-
. To cater for other supply voltages or
DD
Typ.
2.55
.
500
5.0
0.1
0
-
-
-
-
-
-
-
DD
Max.
389
5.1
4.0
0.2
20
= 5.0V.
-
-
-
-
-
-
-
Units
Baud
D/614/4
M
V/V
FX614
ms
ms
ms
ms
ms
Hz
Hz
ns
ns