Datasheet

Maxim Integrated │ 103
MAX98090 Ultra-Low Power Stereo Audio Codec
www.maximintegrated.com
Record Path Digital Gain and Level Control
The stereo record path DSP includes a digital gain
and level control stage. The settings can be configured
independently by channel, and are primarily used when
adjusting the record level for digital microphones. The
coarse digital gain adjustment can be set from 0dB to
+42dB in 6dB increments, and the fine adjust level control
gain can be set from -12dB to +3dB in 1dB increments
(Tables 32 and 33).
Table 33. Right Record Path Digital Gain Configuration Register
Table 32. Left Record Path Digital Gain Configuration Register
ADDRESS: 0x18
DESCRIPTION
BIT NAME TYPE POR
7 — — — —
6
AVRG[2:0] R/W
0
Right Record Path Digital Coarse Gain Conguration
000 : 0dB 010 : +12dB 100 : +24dB 110 : +36dB
001 : +6dB 011 : +18dB 101 : +30dB 111 : +42dB
5 0
4 0
3
AVR[3:0] R/W
0
Right Record Path Digital Fine Adjust Gain Conguration
0x0: +3dB 0x4: -1dB 0x8: -5dB 0xC: -9dB
0x1: +2dB 0x5: -2dB 0x9: -6dB 0xD: -10dB
0x2: +1dB 0x6: -3dB 0xA: -7dB 0xE: -11dB
0x3: +0dB 0x7: -4dB 0xB: -8dB 0xF: -12dB
2 0
1 1
0 1
ADDRESS: 0x17
DESCRIPTION
BIT NAME TYPE POR
7 — — — —
6
AVLG[2:0] R/W
0
Left Record Path Digital Coarse Gain Conguration
000 : 0dB 010 : +12dB 100 : +24dB 110 : +36dB
001 : +6dB 011 : +18dB 101 : +30dB 111 : +42dB
5 0
4 0
3
AVL[3:0] R/W
0
Left Record Path Digital Fine Adjust Gain Conguration
0x0: +3dB 0x4: -1dB 0x8: -5dB 0xC: -9dB
0x1: +2dB 0x5: -2dB 0x9: -6dB 0xD: -10dB
0x2: +1dB 0x6: -3dB 0xA: -7dB 0xE: -11dB
0x3: +0dB 0x7: -4dB 0xB: -8dB 0xF: -12dB
2 0
1 1
0 1