2. Envelope Detector Characteristics: pin 8

The LA6529M includes an on-chip playback signal envelope detector circuit used to achieve automatic tracking

adjustment with essentially linear characteristics.

Envelope Detector Characteristics (design target values) f = 4 MHz

3. Record Amplifier Gain Control

The LA6529M achieves an adjustment-free record current by adding an AGC circuit in the record amplifier block. The

record current can be modified using the circuit shown below.

(1) REC Current.Adj2: When open

Design values: RO1: 1.5 kΩ = 15.6 mAp-p (SP) (per channel)

= 12.3 mAp-p (EP)

(2) REC Current.Adj2: When used

The value determined by RO1 can be adjusted from –6.0 dB to +3.5 dB by applying a control DC level (1 to 4 V) to pin 13.

(Reference)

The circuit below can be used to apply the DC control level to pin 13.

This allows 9 modes (1 to 4 V) to be applied.

No. 5647-6/12

LA7415

SP + external 18 kΩ resistor

Pin 10 playback amplifier output level (mVp-p)

Pin 8 + external 18 kΩ resistor

Design values

Microcontroller