MSM7716 データシートの表示（PDF） - Oki Electric Industry

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MSM7716

Single Rail Linear CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7716

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.

Microphone input

MAO

C1

R2 MAIN –

R1

+

SG

R1 : variable

R2 > 20 kW

C1 > 1/(2 ¥ 3.14 ¥ 30 ¥ R1) (F)

Gain = R2/R1 < 63

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.

Handset

microphone input

R4 PBO

C2

PBIN –

R3

+

SG

R3 : variable

R4 > 20 kW

C2 > 1/(2 ¥ 3.14 ¥ 30 ¥ R3) (F)

Gain = R4/R3 < 63

VDD

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.

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