UPD9930 datasheet(9/78 Pages) NEC

9 / 78 page

µPD9930

to Vref

XAUXI–

XAUXO

(0 to 10 dB)

(to XACOMO)

MICI+

MICI–

(15 to 33 dB)

MICO

MIXI

Accessory input amplifier

Microphone

amplifier

–

Pre-filter +

mixer

0 or –3 dB

2. BLOCK FUNCTIONS

2.1 CODEC

2.1.1 Audio Codec

Audio analog signal and linear code conversion.

•

Input/output format: 16 bits (2's complement)

•

Accuracy: 13 bits

2.1.2 Audio Analog Input

Includes microphone input and accessory input.

(1) Microphone amplifier

Amplifiers differential input signals from the microphone to the required gain.

(2) Accessory input amplifier

Amplifiers the accessory input signal to the required gain.

(3) Pre-filter + mixer

Selects the output signal of microphone amplifier and accessory input amplifier, and inputs these to A/D converter

after controlled gain.

Table 2-1 Analog Input Function

Function

Gain setting method

External resistor

Microcontroller

command

Gain setting range

15 to 33 dB

0 to 10 dB

0 or –3 dB

20 log

(dB)

20 log

(dB)

Minimum resistive load

50 k

Ω

300 k

Ω

—

(Including gain setting resistance)

Maximum capacitive load

20 pF

—

Maximum output level

0.6 V0-p

—

Figure 2-1 Analog Input Block

Amplifier

Microphone Amplifier

Accessory Input Amplifier

Pre-filter + Mixer

UPD9930 Datasheet(PDF) 9 Page - NEC

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