DB929B datasheet(45/51 Pages) CMLMICRO

45 / 51 page

4-Level FSK Modem Data Pump

Page 45 of 50

MX929B PRELIMINARY INFORMATION

www.mxcom.com Tel: 800 638 5577 336 744 5050

Fax: 336 744 5054

Doc. # 20480171.003

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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6.1.3

Operating Characteristics

For the following conditions unless otherwise specified:

Xtal Frequency = 4.9152MHz, Symbol Rate = 4800 symbols/sec (9600bps),

Noise Bandwidth = 0 to 9600Hz, VDD = 3.3V to 5.0V @ TAMB = 25°C

Notes

Min.

Typ.

Max.

Units

DC Parameters

IDD

4.0

10.0

IDD (VDD = 3.3V)

2.5

6.3

IDD (Powersave Mode)

1.5

IDD (Powersave Mode, VDD = 3.3V)

0.6

AC Parameters

Tx Output

TXOUT Impedance

1.0

2.5

Signal Level

TXIMP = 0

0.8

1.0

1.2

VP-P

TXIMP = 1

0.88

1.1

1.32

VP-P

Output DC Offset with respect to VDD /2

-0.25

0.25

Rx Input

RXIN Impedance (at 100Hz)

10.0

RXIN Amp Voltage Gain (input = 1mVRMS at 100Hz)

300

V/V

Input Signal Level

0.7

1.0

1.3

VP-P

DC Offset with respect to VDD /2

-0.5

0.5

Xtal/Clock Input

'High' Pulse Width

'Low' Pulse Width

Input Impedance (at 100Hz)

10.0

Inverter Gain (input = 1 mVRMS at 100Hz)

µC Interface

Input Logic "1" Level

7, 8

70%

VDD

Input Logic "0" Level

7, 8

30%

VDD

Input Leakage Current (VIN = 0 to VDD)

7, 8

5.0

µA

Input Capacitance

7, 8

10.0

Output Logic "1" Level (lOH = 120µA)

92%

VDD

Output Logic "0" Level (lOL = 360µA)

8, 9

VDD

'Off' State Leakage Current (VOUT = VDD)

10.0

µA

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