NJU8721V 查看數據表（PDF） - Japan Radio Corporation

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NJU8721V

CLASS D HEADPHONE AMPLIFIER FOR DIGITAL AUDIO

Japan Radio Corporation  

NJU8721

(6) System Control

(6-1) Standby

Standby functions by “L” level input to the STBY terminal. In busy of Standby, conditions of digital audio

format set, attenuation level, de-emphasis, and attenuator operation time are kept and output terminals of

OUTL and OUTR are high-impedance.

(6-2) Control Mode Set

A control mode as shown below is selected by the MODE terminal.

MODE

0

1

Control Method

Parallel

Serial

Function

Digital Audio interface Format Set

Control Register serial data input

Terminals

F0, F1, F2

DATA, REQ, SCK

Parallel

Serial

: Digital Audio Interface Format is set directly by using F0, F1, and F2 terminals.

: NJU8721 is controlled serial input data by 3-wire serial interface using DATA, REQ, and

SCK terminals

By this setting, the function of F0/DATA, F1/REQ, and F2/SCK are changed.

Refer to  (8-5)F0,F1,F2  about function of F0, F1, and F2 terminals.

Refer to  (8)Control Register  about function of DATA, REQ, and SCK terminals.

(6-3) Mute

Mute functions by “L” signal into the MUTE terminal. In busy of mute, a current attenuation value

becomes -∞ by internal digital attenuator. And MUTE is stopped by “H” signal into the MUTE terminal, the

attenuation value returns from -∞ to previous value.

MUTE

0

1

Attenuation Level

-∞

Set Value

MUTE

MCK

Attenuation Value

Set Value

1024/fS

-∞

1024/fS

Set Value

-∞

Figure 2. Mute Timing

-4-

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