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TFA9812_2 © NXP B.V. 2009. All rights reserved.
Preliminary data sheet Rev. 02 — 22 January 2009 39 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplifier with I
2
S input
[1] 32 kHz, 44.1 kHz and 48 kHz supported
[2] Bypass.
[3] Special Legacy mode implementation.
[4] 10 % clip level.
[5] 400 kHz.
10. Internal circuitry
Clip level control Section 8.5.5 YD
[4]
Output power limit level control Section 8.5.6 YY
PWM signal frequency selection
Section 8.5.7 YD
[5]
Thermal foldback threshold temperature control Section 8.7.1 YN
Table 51. Functional control support in I
2
C and Legacy control modes
…continued
D = fixed control setting, determined by default I
2
C register setting; N = not supported; Y = fully
supported (i.e. all options implemented in the TFA9812).
Control function Reference I
2
C mode Legacy mode
Table 52. Internal circuitry
Pin Symbol Equivalent circuitry
1 XTALIN
32 AVOL
2 XTALOUT
3V
DDA(3V3)
40 V
DDD(3V3)
1, 32
ESD
V
SS1
, V
SS2
, REFA, REFD
Exposed die paddle
010aaa459
STABA
2
V
SS1
, V
SS2
, REFA, REFD,
Exposed die-paddle
010aaa460
ESD
V
SS1
, V
SS2
, REFA, REFD,
Exposed die-paddle
010aaa461
3, 40
ESD