Datasheet

ADAU1761
Rev. C | Page 58 of 92
R7: Record Mixer Right (Mixer 2) Control 1, 16,397 (0x400D)
This register controls the gain boost of the right channel differential PGA input and the gain for the right channel auxiliary input in the
record path. The right channel record mixer is referred to as Mixer 2.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved
RDBOOST[1:0] MX2AUXG[2:0]
Table 41. Record Mixer Right (Mixer 2) Control 1 Register
Bits Bit Name Description
[4:3] RDBOOST[1:0]
Right channel differential PGA input gain boost, input to Mixer 2. The right differential input uses the RINP
(positive signal) and RINN (negative signal) pins.
Setting Gain Boost
00 Mute (default)
01 0 dB
10
20 dB
11
Reserved
[2:0] MX2AUXG[2:0] Right single-ended auxiliary input gain from the RAUX pin in the record path, input to Mixer 2.
Setting Auxiliary Input Gain
000 Mute (default)
001 −12 dB
010
−9 dB
011
−6 dB
100
−3 dB
101
0 dB
110
3 dB
111 6 dB
R8: Left Differential Input Volume Control, 16,398 (0x400E)
This register enables the differential path and sets the volume control for the left differential PGA input.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
LDVOL[5:0]
LDMUTE LDEN
Table 42. Left Differential Input Volume Control Register
Bits Bit Name Description
[7:2] LDVOL[5:0]
Left channel differential PGA input volume control. The left differential input uses the LINP (positive signal) and
LINN (negative signal) pins. Each step corresponds to a 0.75 dB increase in gain. See Table 92 for a complete list
of the volume settings.
Setting Volume
000000 −12 dB (default)
000001 −11.25 dB
…
…
010000
0 dB
…
…
111110
34.5 dB
111111
35.25 dB
1 LDMUTE Left differential input mute control.
0 = mute (default).
1 = unmute.
0 LDEN
Left differential PGA enable. When enabled, the LINP and LINN pins are used as a full differential pair. When
disabled, these two pins are configured as two single-ended inputs with the signals routed around the PGA.
0 = disabled (default).
1 = enabled.