M65818AFP

Rev.1.00, Sep.04.2003, page 25 of 38

Table (6-1-1b). Limit Value [In the case of 5bit mode System2 mode:bit17(NSOBIT)="H"]

DSLMT1

DSLMT2

Limit Value of Gain

PWM Output Value (Limit Value from

∆Σ

∆Σ

∆Σ

∆Σ Block)

L

L

±0.90625

31 values (±15)

H

L

±0.875

31 values (±15)

L

H

±0.84375

29 values (±14)

H

H

±0.8125

29 values (±14)

• Channel Selection for Gain Control Block (bit7,bit8:GCONT1 ,GCONT2 )

These bit selection enable to control gain data "L/R common" or "L/R independence".

GCONT1 :"L"…L/Rch common, "H"…L/Rch independence.

GCONT2 :"L"…Rch only, "H"…Lch only.

Bit8 is available only the case of `bit7 = "H"`.

• The index and Mantissa part of Gain Data. (bit12 -bit24,: GAIN0 -GAIN12 )

The Gain value is set from bit12 to bit24.

Index part: bit12 (MSB) to bit16(LSB)

Mantissa part: bit17 (MSB) to bit24 (LSB)

The Gain Data is assigned 13bits, composed of Index part 5bits and of Mantissa part 8bits,

The range of Index parts is following statements.

Index part: 10100b(16.0) to 10000b(1.0) to 00000b( 2

The range of mantissa part is following as statement.

Index part; 10100b to 00001b: Mantissa part; 11111111b to 10000000b (128 step/1 Index).

Index part;00000b: Mantissa part; 11111111b to00000000b (256 step).

Initial value: Index part: 10000b Mantissa part:10000000b

infinity zero: Index part: 00000b Mantissa part:00000000b

# Notice of GAIN value Setting continuously

In the case of GAIN value Setting continuously, for example of Setting L/Rch independently, please take the interval

time (pulse interval time of SCLATCH signal) more than 1/fso.For example, in the case of fso=48kHz, please take the

interval time more than 21µsec.

• The Gain Data and Audio Output Level.

Gain data consists of 13bits (Index part; 5bit, Mantissa part; 8bit ).

e.g. 10000b(1.0)/10000000b(0.5) means 0.5(0dB).