Wireless Modem Data Pump
FX909A
Operating Characteristics
For the following conditions unless otherwise specified:
Xtal Frequency = 4.096MHz, Bit Rate = 8k bits/sec, Noise Bandwidth = Bit Rate,
V
DD
= 3.3V to 5.0V, Tamb = - 40°C to +85°C.
Notes
Min.
Typ.
Max.
Units
DC Parameters
I
I
I
I
(not powersaved)
(powersaved)
(not powersaved)
(powersaved)
(V = 3.3V)
1
1
1
1
2.2
0.4
3
3.3
0.6
4.5
1.4
mA
mA
mA
mA
DD
DD
DD
DD
DD
(V = 3.3V)
DD
(V = 5.0V)
DD
(V = 5.0V)
DD
0.9
AC Parameters
Tx Output
TXOP Impedance (not powersaved)
TXOP Impedance (powersaved)
Signal Level
2
2
3
4
1.0
300
1.0
4
2.5
kW
kW
V pk-pk
bits
0.9
1.1
6
Tx Data Delay
Rx Input
RXIN Impedance (at 100Hz)
RXIN Amp Voltage Gain (I/P = 1mVrms at 100Hz)
Input Signal Level
10.0
0.7
MW
V/V
V pk-pk
bits
500
1.0
3.5
5
6
1.3
Rx Data Delay
Xtal/Clock Input
'High' Pulse Width
'Low' Pulse Width
7
7
40
40
ns
ns
Input Impedance (at 100Hz)
Gain (I/P = 1mVrms at 100Hz)
10.0
20
MW
dB
µC Interface
Input Logic "1" Level
Input Logic "0" Level
Input Leakage Current (Vin = 0 to V
Input Capacitance
8, 9
8, 9
8, 9
8, 9
9
70%
5.0
90%
V
DD
30%
+5.0
V
DD
)
DD
µA
pF
10.0
Output Logic "1" Level (l = 120µA)
V
DD
OH
Output Logic "0" Level (l = 360µA)
'Off' State Leakage Current (Vout = V
9,10
10
10%
10
V
DD
µA
OL
)
DD
Notes:
1. Not including any current drawn from the modem pins by external circuitry.
2. Small signal impedance, at V = 5.0V and Tamb = 25°C.
DD
3. For "1111000011110000.." bit sequence, at V = 5.0V and Tamb = 25°C
DD
(output level is proportional to V ).
DD
4. Measured between issuing first task after idle and the centre of the first bit at TXOP
(See Figure 7, 'The Transmit Process').
5. For optimum performance, measured at RXFB pin,
for a "...11110000..." bit sequence, at V = 5.0V and Tamb = 25°C.
DD
6. Measured between centre of last bit of an Rx single byte or Frame Sync at RXIN and an IRQ
interrupt to the host µC.
7. Timing for an external input to the CLOCK/XTAL pin.
8. WRN, RDN, CSN, A0 and A1 pins.
9. D0 - D7 pins.
10. IRQN pin.
ã 1996 Consumer Microcircuits Limited
41
D/909A/4
CMLMICRO [ CML MICROCIRCUITS ]
