V.23 Compatible Modem
FX604
Notes
Min.
Typ.
Max.
Units
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
8
8
9
9
9
-
-
-
-
-
2.55
0.1
-
-
-
-
-
ms
ms
ms
ms
ms
20
4.0
0.2
Input Amplifier
Impedance (RXIN Pin)
Voltage Gain
6
6
10.0
-
-
-
-
MW
V/V
500
XTAL/CLOCK Input
'High' Pulse Width
'Low' Pulse Width
7
7
100
100
-
-
-
-
ns
ns
Notes: 1. At 25°C, not including any current drawn from the FX604 pins by external circuitry other than
X1, C1 and C2.
2. TXD, RXEQ and CLK inputs at VSS, M0 and M1 inputs at VDD
.
3. Measured at the Rx Input Amplifier output (pin RXFB) for 1300Hz and VDD= 5.0V.
The internal threshold levels are proportional to VDD. 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 300-3400Hz band.
5. Relative to 775mVrms at VDD= 5.0V for load resistances greater than 40kW.
6. Open loop, small signal low frequency measurements.
7. Timing for an external input to the XTAL/CLOCK pin.
8. Assuming data retiming is not enabled.
9. Delay from mode change to reliable data at TXOP or RXD pins.
ã 1996 Consumer Microcircuits Limited
15
D/604/3
CMLMICRO [ CML MICROCIRCUITS ]
