MM1102 データシートの表示（PDF） - Mitsumi

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MM1102

Compander IC

Mitsumi 

MITSUMI

Compander IC MM1102

About Application Circuits

1. Mike amp

The compressor unit mike amp is exposed to circuits outside the IC via positive and negative input pins.

The positive input pin is connected to C.Vref by a bias resistance of 100kΩ, so that no external bias is

needed.

he internal configuration appears in Fig. 1. When pin 4 is open the gain is lowest, and an input voltage of

approx. 13.5mVrms is the reference level. When the external resistance is 0Ω, the gain is maximum. The

internal configuration appears in Fig. 1.

2. Rectifier circuit unit (rectifier)

The product of the external capacitance and the internal resistance (10kΩ) determines the time constants

for the attack and release times.

3. Compressor amp

The compressor amp requires that the DC gain be unity and the AC gain be infinite. In order to satisfy this

requirement, AC feedback is eliminated and only DC feedback is used. In order that only DC feedback be

present, a capacitor to eliminate AC components is connected to pin 8. The cutoff frequency is determined

by the product with the internal resistance (10kΩ).

4. Compressor data amp

The data amp uses an inverting amp. The internal input resistance is 100kΩ, and the DC bias voltage is

1.3V. The compressor mute switch at pin 15 is used to switch between data signals and audio signals.

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