CXA2561Q View Datasheet(PDF) - Sony Semiconductor

Part Name

Description

Manufacturer

CXA2561Q

Dolby B-C Type Noise Reduction System with Playback Equalizer Amplifier

Sony Semiconductor 

CXA2561Q

5. Operating mode control method

The CXA2561Q has a Dolby NR mode select switch (NRMODE), Dolby NR switch (NRSW), mute switch

(MUTE SW), playback equalizer amplifier select switch (TAPESW), head input select switch (DRSW), music

sensor mode select switch (MSMODE) and music sensor switch (MSSW).

The operating modes for each switch are shown in the following table.

Pin No.

Pin name

15 NRMODE

16 NRSW

17 MUTESW

18 TAPESW

19 DRSW

20 MSMODE

21 MSSW

Pin voltage

Low (OPEN)

Dolby B type NR

Dolby NR OFF

MUTE OFF

70µs

PBIN FORWARD

G1

MS ON

High

Dolby C type NR

Dolby NR ON

MUTE ON

120µs

PBIN REVERSE

G2

MS OFF

Notes on Operation

1. DIREF pin resistance

The current on DIREF (Pin 25) is the reference for the Dolby NR static characteristic, playback equalizer

amplifier resistor 7kΩ/12kΩ and the comparator threshold value of the music sensor.

Use the resistor with high accuracy for connecting to the DIREF pin.

(The resistance accuracy of 2% <metal-oxide> is recommended.)

2. Dolby NR

The Dolby NR attack/recovery time is determined by the capacitance connected to TCH (Pins 8 and 23),

and TCL (Pin 9 and 22).

Use the parts, connected to these pins, with high accuracy and small temperature characteristics.

(The capacitance accuracy of 10% <film> is recommended.)

3. Playback equalizer amplifier

The playback equalizer amplifier characteristics are determined by the resistor connected between the IC

internal resistor and PBFB (Pins 31 and 40) and the capacitor connected between PBFB and PBTC (Pins 1

and 30). Use the parts which satisfies the accuracy required for the playback equalizer amplifier.

4. Music sensor

The resistance and capacitance connected to G2FB (Pin 11) and G1FB (Pin 12) determine the detection

level and high-frequency cut-off.

The response time is determined by the resistance and capacitance connected to MSTC (Pin 13).

Use the parts which satisfies the accuracy required for the music sensor.

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