FX919B Datasheet, PDF (42/47 Pages) CML Microcircuits – Excellent Radio Fading Performance

4-Level FSK Modem Data Pump
Operating Characteristics
For the following conditions unless otherwise specified:
Xtal Frequency = 4.9152MHz, Symbol Rate = 4800 symbols/sec,
Noise Bandwidth = 0 to 9600Hz, V_DD = 3.3V to 5.0V, Tamb = - 40°C to +85°C.
DC Parameters
I_DD (V_DD = 5.0V)
I_DD (V_DD = 3.3V)
I_DD (Powersave Mode V_DD = 5.0V)
I_DD (Powersave ModeV_DD = 3.3V)
Notes
1
1
1
1
AC Parameters
Tx Output
TXOP Impedance
2
Signal Level TXIMP = 0
3
Signal Level TXIMP = 1
3
Output DC Offset wrt V_DD/2
4
Rx Input
RXIN Impedance (at 100Hz)
RXIN Amp Voltage Gain (I/P = 1mVrms at 100Hz)
Input Signal Level
5
DC Offset wrt V_DD/2
5
Xtal/Clock Input
'High' Pulse Width
6
'Low' Pulse Width
6
Input Impedance (at 100Hz)
Inverter Gain (I/P = 1mVrms at 100Hz)
Min.
0.8
0.88
-0.25
0.7
-0.5
40
40
10.0
20
Typ.
4.0
2.5
1.5
0.6
1.0
1.0
1.1
10.0
300
1.0
Max.
10.0
6.3
2.5
1.2
1.32
+0.25
1.3
+0.5
µC Interface
Input Logic "1" Level
Input Logic "0" Level
Input Leakage Current (Vin = 0 to V_DD)
Input Capacitance
Output Logic "1" Level (l_OH = 120µA)
Output Logic "0" Level (l_OL = 360µA)
'Off' State Leakage Current (Vout = V_DD)
7, 8 70%
7, 8
7, 8
5.0
7, 8
10.0
8
92%
8,9
9
30%
+5.0
8%
10
FX919B
Units
mA
mA
mA
mA
kΩ
V pk-pk
V pk-pk
V
MΩ
V/V
V pk-pk
V
ns
ns
MΩ
dB
V_DD
V_DD
µA
pF
V_DD
V_DD
µA
Notes:
1. At 25°C. Not including any current drawn from the modem pins by external circuitry other than
the Xtal oscillator.
2. Small signal impedance, at V_DD = 5.0V and Tamb = 25°C.
3. Measured after the external RC filter (R4/C5) for a "+3 +3 -3 -3...." symbol sequence, at V_DD
= 5.0V and Tamb = 25°C (Tx output level is proportional to V_DD).
4. Measured at the TXOP pin with the modem in the Tx idle mode.
5. For optimum performance, measured at RXFB pin, for a "...+3 +3 -3 -3..." symbol sequence,
at V_DD = 5.0V and Tamb = 25°C, TXIMP = 0 or 1. The optimum level and DC offset values are
proportional to V_DD.
6. Timing for an external input to the CLOCK/XTAL pin.
7. WRN, RDN, CSN, A0 and A1 pins.
8. D0 - D7 pins.
9. IRQN pin.
© 1997 Consumer Microcircuits Limited
42
D/919B/1