FX614 Datasheet, PDF (15/17 Pages) CML Microcircuits – Optional Line Equalisation

Bell 202 Compatible Modem
Tx 5bits/sec (M1 = '1', M0 = '0').
Bit Rate
Mark (Logical '1') Frequency
Space (Logical '0') Frequency
Data and Mode Timing
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
Input Amplifier
Impedance (RXIN Pin)
Voltage Gain
XTAL/CLOCK Input
'High' Pulse Width
'Low' Pulse Width
FX614
Notes
6
Min.
0
385
-
9
-
9
-
10
-
10
-
10
-
7
10.0
7
-
8
100
8
100
Typ.
5.0
-
0
2.55
0.1
-
-
-
-
500
-
-
Max.
5.1
389
-
Units
Baud
Hz
Hz
-
ms
-
ms
20
ms
4.0
ms
0.2
ms
-
MΩ
-
V/V
-
ns
-
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. TXD, RXEQ and CLK inputs at V_SS, M0 and M1 inputs at V_DD.
3. Measured at the Rx Input Amplifier output (pin RXFB) for 1200Hz and V_DD= 5.0V.
The internal threshold levels are proportional to V_DD. To cater for other supply voltages or
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. Relative to 775mVrms at V_DD= 5.0V for load resistances greater than 40kΩ.
6. TXOP held at approximately V_DD/2.
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.
© 1997 Consumer Microcircuits Limited
15
D/614/4