MAS9191A datasheet(4/36 Pages) MAS

4 / 36 page

DA9191A.000

July 31, 1997

PIN DESCRIPTION

Pin name

Type

Function

RXACCIN

RX block extra Op Amp input

EXPOUT

Expander output. The expander ratio is 1:2.

EWCIN

Expander window comparator input. Connect a 22nF capacitor between

EWCIN and EAMPOUT.

EAMPOUT

Expander amplifier output.

EXPIN

Expander input. Connect a 22nF capacitor between EXPIN and

RBPFOUT.

VDAR

Power supply for RX audio block. Use a bypass capacitor between VDAR

and VSAR.

VSAR

Ground for RX block. Connect to system ground.

RBPFOUT

RX bandpass filter output.

RBPFIN

RX bandpass filter input. Connect a 22nF capacitor between this pin and

DEOUT

RX de-emphasis filter output. The filter has a -6dB/octave (±1dB)

frequency response in the range 300Hz...3kHz.

VREF

Reference voltage. Connect a capacitor between this pin and system

ground.

RX input from RF. This level is 100mVrms at 1kHz.

ALP

Audio loop input. Connect through a 22nF capacitor to the TX pin.

TEST2

Test input. Connect to ground during normal operation.

TEST1

Test input. Connect to ground during normal operation. If connected to

VDD and TEST2 is connected to ground, the external clock can then be

connected to XTAL1.

CLKOUT

4.8 MHz clock output from oscillator circuit.

TXCTRL

Transmission control output. If a TX collision occurs this open-collector

output is set to low. The TXCTRL will remain low until the TX block is reset

with the TXRST bit or with XRESET.

VSS

Digital ground. Connect a bypass capacitor between VSS and VDD.

XTAL2

Crystal oscillator output.

XTAL1

Crystal oscillator input or external clock input if TEST1 is high and TEST2

is low.

VDD

Power supply input for digital block.

TXON

Transmission detection for debugging. This output indicates when a

transmission is occurring.

BUSY

Busy/Idle output. Indicates the state of the busy/idle bit.

XINT

Active low interrupt output to micro controller. The interrupt is active until

status register 10HEX is read.

DACOUT3

Output of DAC 3. The DAC output is connected to ground if the DAC is in

power down mode. The output of the DAC is controlled by register 18HEX.

Enter the values in two’s complement form into the DAC register.

DACOUT2

Output of the DAC 2. The control register is located at 17HEX.

DACOUT2

Output of the DAC 1. The control register is located at 16HEX.

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