AK8858 Datasheet, PDF (79/96 Pages) Asahi Kasei Microsystems – PS/SD Multi Format Video Decoder

[9.1.15] PGA1 Control Register (R/W) [Sub Address 0x0E]
PGA1 gain control register setting.
[AK8858]
Sub Address: 0x0E
bit 7
bit 6
APGA1_1 APGA1_0
Default Value
0
1
bit 5
DPGA1_5
0
bit 4
DPGA1_4
1
bit 3
DPGA1_3
0
bit 2
DPGA1_2
1
Default Value: 0x54
bit 1
bit 0
DPGA1_1 DPGA1_0
0
0
BIT Register Name
bit 0 DPGA1_0
~
~
bit 5 DPGA1_5
bit 6 APGA1_0
~
~
bit 7 APGA1_1
Digital PGA1 Control
Analog PGA1 Control
R/W Definition
R/W
Digital PGA1 gain setting.
PGA gain is set by following equation.
Analog PGA1 gain setting.
[00]: −3dB
R/W [01]: 0dB
[10]: +3dB
[11]: +6dB
Digital PGA gain equation:
Gain(dB) = 20LOG_⎜⎛ ^{(5× PGA)+ 497} _⎟⎞
⎝ ⁵¹² ⎠
*PGA: PGA1 or PGA2 register value (Decimal)
Default gain setting is 0x54(HEX)=1.3dB. (Analog:0dB + Digital:1.3dB)
[9.1.16]PGA2 Control Register (R/W) [Sub Address 0x0F]
PGA2 gain control register setting.
Sub Address: 0x0F
bit 7
bit 6
APGA2_1 APGA2_0
Default Value
0
1
bit 5
DPGA2_5
0
bit 4
DPGA2_4
1
bit 3
DPGA2_3
0
bit 2
DPGA2_2
1
Default Value: 0x54
bit 1
bit 0
DPGA2_1 DPGA2_0
0
0
BIT Register Name
bit 0 DPGA2_0
~
~
bit 5 DPGA2_5
bit 6 APGA2_0
~
~
bit 7 APGA2_1
Digital PGA1 Control
Analog PGA1 Control
R/W Definition
R/W
Digital PGA2 gain setting.
PGA gain is set by above equation.
Analog PGA2 gain setting.
[00]: −3dB
R/W [01]: 0dB
[10]: +3dB
[11]: +6dB
MS1230-E-00
- 79 -
2010/9