Internal circuitry, Tfa9812, Nxp semiconductors – NXP Semiconductors TFA9812 User Manual
Page 39
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
Y
Output power limit level control
Y
Y
PWM signal frequency selection
Y
Thermal foldback threshold temperature control
Y
N
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
3
V
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