¡ Semiconductor

MSM7716

4/22

PIN AND FUNCTIONAL DESCRIPTIONS

MAIN, MAO

Transmit microphone input and the level adjustment.

MAIN is connected to the noninverting input of the op-amp, and MAO is connected to the output

of the op-amp. The level adjustment should be configured as shown below.

During power saving and power down modes, the MAO output is in high impedance state.

–

+

MAIN

C1

Microphone input

R1 : variable

R2 > 20 kW

C1 > 1/(2 ¥ 3.14 ¥ 30 ¥ R1) (F)

Gain = R2/R1 < 63

R2

MAO

R1

SG

PBIN, PBO

Transmit handset input and the level adjustment.

PBIN is connected to the noninverting input of the op-amp, and PBO is connected to the output

of the op-amp. The level adjustment should be configured as shown below.

During power saving and power down, the PBO output is in high impedance state.

Power supply pin for +2.7 to 3.6 V (Typically 3.0 V).

AG

Analog signal ground.

DG

Ground pin for the digital signal circuits.

This ground is separated from the analog signal ground in this device. The DG pin must be

connected to the AG pin on the printed circuit board.

–

+

PBIN

C2

R3 : variable

R4 > 20 kW

C2 > 1/(2 ¥ 3.14 ¥ 30 ¥ R3) (F)

Gain = R4/R3 < 63

R4

PBO

R3

SG

Handset

microphone input