AK7755EN_16 Datasheet, PDF (91/109 Pages) Asahi Kasei Microsystems – DSP with Mono ADC Stereo CODEC + Mic/Lineout Amp

[AK7755]
code dB code dB code dB code dB code dB code dB code DB code dB
00h 12.0 20h -4.0 40h -20.0 60h -36.0 80h -52.0 A0h -68.0 C0h -84.0 E0h -100.0
01h 11.5 21h -4.5 41h -20.5 61h -36.5 81h -52.5 A1h -68.5 C1h -84.5 E1h -100.5
02h 11.0 22h -5.0 42h -21.0 62h -37.0 82h -53.0 A2h -69.0 C2h -85.0 E2h -101.0
03h 10.5 23h -5.5 43h -21.5 63h -37.5 83h -53.5 A3h -69.5 C3h -85.5 E3h -101.5
04h 10.0 24h -.6.0 44h -22.0 64h -38.0 84h -54.0 A4h -70.0 C4h -86.0 E4h -102.0
05h 9.5 25h -6.5 45h -22.5 65h -38.5 85h -54.5 A5h -70.5 C5h -86.5 E5h -102.5
06h 9.0 26h -7.0 46h -23.0 66h -39.0 86h -55.0 A6h -71.0 C6h -87.0 E6h -103.0
07h 8.5 27h -7.5 47h -23.5 67h -39.5 87h -55.5 A7h -71.5 C7h -87.5 E7h -103.5
08h 8.0 28h -8.0 48h -24.0 68h -40.0 88h -56.0 A8h -72.0 C8h -88.0 E8h -104.0
09h 7.5 29h -8.5 49h -24.5 69h -40.5 89h -56.5 A9h -72.5 C9h -88.5 E9h -104.5
0Ah 7.0 2Ah -9.0 4Ah -25.0 6Ah -41.0 8Ah -57.0 AAh -73.0 CAh -89.0 EAh -105.0
0Bh 6.5 2Bh -9.5 4Bh -25.5 6Bh -41.5 8Bh -57.5 ABh -73.5 CBh -89.5 EBh -105.5
0Ch 6.0 2Ch -10.0 4Ch -26.0 6Ch -42.0 8Ch -58.0 ACh -74.0 CCh -90.0 ECh -106.0
0Dh 5.5 2Dh -10.5 4Dh -26.5 6Dh -42.5 8Dh -58.5 ADh -74.5 CDh -90.5 EDh -106.5
0Eh 5.0 2Eh -11.0 4Eh -27.0 6Eh -43.0 8Eh -59.0 AEh -75.0 CEh -91.0 EEh -107.0
0Fh 4.5 2Fh -11.5 4Fh -27.5 6Fh -43.5 8Fh -59.5 AFh -75.5 CFh -91.5 EFh -107.5
10h 4.0 30h -12.0 50h -28.0 70h -44.0 90h -60.0 B0h -76.0 D0h -92.0 F0h -108.0
11h 3.5 31h -12.5 51h -28.5 71h -44.5 91h -60.5 B1h -76.5 D1h -92.5 F1h -108.5
12h 3.0 32h -13.0 52h -29.0 72h -45.0 92h -61.0 B2h -77.0 D2h -93.0 F2h -109.0
13h 2.5 33h -13.5 53h -29.5 73h -45.5 93h -61.5 B3h -77.5 D3h -93.5 F3h -109.5
14h 2.0 34h -14.0 54h -30.0 74h -46.0 94h -62.0 B4h -78.0 D4h -94.0 F4h -110.0
15h 1.5 35h -14.5 55h -30.5 75h -46.5 95h -62.5 B5h -78.5 D5h -94.5 F5h -110.5
16h 1.0 36h -15.0 56h -31.0 76h -47.0 96h -63.0 B6h -79.0 D6h -95.0 F6h -111.0
17h 0.5 37h -15.5 57h -31.5 77h -47.5 97h -63.5 B7h -79.5 D7h -95.5 F7h -111.5
18h 0.0 38h -16.0 58h -32.0 78h -48.0 98h -64.0 B8h -80.0 D8h -96.0 F8h -112.0
19h -0.5 39h -16.5 59h -32.5 79h -48.5 99h -64.5 B9h -80.5 D9h -96.5 F9h -112.5
1Ah -1.0 3Ah -17.0 5Ah -33.0 7Ah -49.0 9Ah -65.0 BAh -81.0 DAh -97.0 FAh -113.0
1Bh -1.5 3Bh -17.5 5Bh -33.5 7Bh -49.5 9Bh -65.5 BBh -81.5 DBh -97.5 FBh -113.5
1Ch -2.0 3Ch -18.0 5Ch -34.0 7Ch -50.0 9Ch -66.0 BCh -82.0 DCh -98.0 FCh -114.0
1Dh -2.5 3Dh -18.5 5Dh -34.5 7Dh -50.5 9Dh -66.5 BDh -82.5 DDh -98.5 FDh -114.5
1Eh -3.0 3Eh -19.0 5Eh -35.0 7Eh -51.0 9Eh -67.0 BEh -83.0 DEh -99.0 FEh -115.0
1Fh -3.5 3Fh -19.5 5Fh -35.5 7Fh -51.5 9Fh -67.5 BFh -83.5 DFh -99.5 FFh Mute
Table 10. DAC Digital Volume Setting List
3. DAC Soft Mute
The DAC block has a digital soft mute circuit. The soft mute operation is performed in the digital
domain. The input signal is attenuated to -∞ in “DAC Digital Volume Level x ATT transition time”
from the current DAC Digital Volume Setting Level by setting DAMUTE bit (CONT1A: D5) to “1”.
When the DAMUTE bit is returned to “0”, the mute is cancelled and the input attenuation gradually
changes to DAC Digital Volume Setting Level in “DAC Digital Volume Level x ATT transition
time”. If the soft mute is cancelled before attenuating to -∞ after starting the operation, the attenuation
is discontinued and returned to DAC Digital Volume Setting Level by the same cycle. The soft mute is
effective for changing the signal source without stopping the signal transmission. The soft mute
function works when the DAC is in operation. Since the DAC block is in reset state, there is a
possibility that a click noise occurs by a reset and a reset release when CRESETN bit (CONT0F: D3)
= “0” and PMDAL/R bit (CONT0E: D0/D1) = “0”. This click noise should be muted externally. The
attenuation value is initialized by the PDN pin = “L”.
DAMUTE Register
Attenuation
0dB
-∞dB
(Setting+2)/fs(max)
GD
(Setting+2)/fs(max)
GD
Output Image
014006643-E-00
Soft Mute Operation
Figure 73. DAC Soft Mute Operation
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