FX949 datasheet(20/25 Pages) CMLMICRO

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CDPD Wireless Modem Data Pump

FX949

D/949/5

Operating Characteristics

For the following conditions unless otherwise specified:

Xtal Frequency = 4.9152MHz, Bit Rate = 19.2k bits/sec,

VDD = 3.3V to 5.0V, Tamb = -40°C to +85°C.

Notes

Min.

Typ.

Max.

Units

DC Parameters

IDD (powersaved)

(VDD = 5.0V)

1, 10

1.3

2.0

IDD (all enabled)

(VDD = 5.0V)

1, 10

5.0

7.0

IDD (powersaved)

(VDD = 3.0V)

1, 10

0.5

1.0

IDD (all enabled)

(VDD = 3.0V)

1, 10

2.0

3.0

AC Parameters

Tx Output

Tx O/P Impedance (Tx enabled)

1.0

2.5

Ω

Tx O/P Impedance (powersaved)

300

500

Ω

Output Signal Level

0.9

1.0

1.1

Vpk-pk

Power up to Tx O/P Stable

bits

Rx Input

Rx I/P Impedance (at 100Hz)

Ω

Rx I/P Amp Voltage Gain (I/P = 1mVrms at 100Hz)

500

V/V

Input Signal Level

0.7

1.0

1.3

Vpk-pk

Xtal/Clock Input

'High' Pulse Width

'Low' Pulse Width

Input Impedance (at 100Hz)

Ω

Gain (I/P = 1mV rms at 100Hz)

µP Interface

Input Logic "1" Level

4, 5

70%

VDD

Input Logic "0" Level

4, 5

30%

VDD

Input Leakage Current (Vin = 0 to VDD)

4, 5

−

5.0

+5.0

µA

Input Capacitance

4, 5

10.0

Output Logic "1" Level (lOH = 120µA)

90%

VDD

Output Logic "0" Level (lOL = 360µA)

5, 6

10%

VDD

'Off' State Leakage Current (Vout = VDD)

µA

Notes:

Not including any current drawn from the modem pins by external circuitry.

Small signal impedance, at VDD = 5.0V and Tamb = 25°C.

Timing for an external input to the CLOCK/XTAL pin.

WRN, RDN, CSN, A0 - A6 pins.

D0 - D7 pins.

IRQN pin.

For 1111000011110000.. bit sequence, at VDD = 5.0V and Tamb = 25°C.

(output level is proportional to VDD).

Measured between setting PSTX to "'0" and TXSIGNAL becoming stable.

For optimum performance, measured at RX SIGNAL FEEDBACK pin,

for a '...11110000...' bit sequence, at VDD = 5.0V and Tamb = 25°C.

10. At Tamb = 25°C only.

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