AS3421 datasheet(31/61 Pages) AMSCO

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AS3421 AS3422

Datasheet - R e g i s t e r D e s c r i p t i o n

Table 18. LINE_IN Register

Name

Base

Default

LINE_IN

2-wire serial

00h

Offset: 0Ah

Line Input Register

Configures the attenuation for the line input, defines the line input operation mode and enables register

0Ah. This register is reset at POR.

Bit

Bit Name

Default

Access

Bit Description

LIN_REG_ON

R/W

Defines which source is used for the line input settings.

0: settings of register 33h and VOL pin are used

1: register 0Ah is used

LINE_GAIN_+3dB

R/W

Selects the line input operating gain range. If this bit is set the gain range of

the line input amplifiers is shifted by +3dB.

0: Line Input gain range from -46.5dB...0dB

1: Line Input gain range from -43.5dB...+3dB

5:0

LIN_VOL<5:0>

00 0000

R/W

Volume settings for line input, adjustable in 63 steps of 0.75dB. the following

gain settings are valid if LINE_GAIN_+3dB bit is set to ‘0’.

00 0000: MUTE

00 0001:-46.5dB gain

00 0010:-45.75dB gain

11 1110:-0.75dB gain

11 1111:.0 dB gain

Volume settings for line input, adjustable in 63 steps of 0.75dB. the following

gain settings are valid if LINE_GAIN_+3dB bit is set to ‘1’.

00 0000: MUTE

00 0001:-43.5dB gain

00 0010:-42.75dB gain

11 1110:+2.25dB gain

11 1111:+3 dB gain

Table 19. GP_OP_L Register

Name

Base

Default

GP_OP_L

2-wire serial

00h

Offset: 0Bh

Left General Purpose Operational Amplifier Register

Enables the left opamp stages, defines opamp 2 mode and gain and sets the HP input multiplexer. This

Bit

Bit Name

Default

Access

Bit Description

7:6

HP_MUX<1:0>

R/W

Multiplexes the analog audio signal to HP amp

00: MIC: selects QMICL/R output

01: OP1: selects QOP1L/R outputs

10:OP2: selects QOP2L/R output

11: open: no signal mixed together with the line input signal

5:2

OP2L<3:0>

0000

R/W

Mode and volume settings for left OP2, adjustable in 15 steps of 0.75dB

0000: OP2L in inverting mode

0001: 0 dB gain, OP2L in non inverting mode

0001: 0.75 dB gain, non inverting

..,

1110: 9.75dB gain, non inverting

1111:.10.5 dB gain, non inverting

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