92hd90 Integrated Device Technology, 92hd90 Datasheet - Page 279

• Manufacturer Part Number: 92hd90
• Description: Single Chip Pc Audio System Codec+speaker Amplifier+capless Hp+ldo+i2s
• Manufacturer: Integrated Device Technology

92HD90
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
IDT CONFIDENTIAL
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
These 8-bit registers set the timer values between incrementing/decrementing the Compressor attenuation values. There is
one register each for Attack, Hold, and Release times, the configuration parameters are the same for all three and are
shown in the table below.
verb F87/787
verb F88/788
verb F89/789
verb F8A/78A
Register Address
Register Address
Register Address
Register Address
7.29.1.14. PWM0 Register
7.29.1.15. LMTCTRL Register
Control operation of the volume Limiter (Compressor).
7.29.1.16. LMTATKTIME (0x19), LMTHOLDTIME (0x1A), LMTRELTIME (0x1B) Registers
7:6
5
4
3
2
1
0
7:4
3
2:1
0
7
6:0
7
6:0
Bit
Bit
Bit
Bit
PhaseOffset
clk320mode
roundup
bfclr
fourthorder
add3_sel
Btl_test_mode
–
zerocross
stepsize
limiter_en
ATK10ms
LMTAT[6:0]
HOLD10ms
LMTHT[6:0]
Label
Label
Label
Label
RW
RW
RW
R
RW
RW
RW
RW
RO
RW
RW
RW
RW
RW
RW
Type Default
Type Default
Type Default
Type
01
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Default
279
1 = value in bits 6:0 is in 10ms units, otherwise 1ms units.
Timer value in units of 1 or 10ms.
PWM ch1 offset from ch0 at 8x sample rate by:
00 = 0 degrees
01 = 90 degrees
10 = 180 degrees
11 = NA
1 = PCA clock 320 mode
0 = PCA clock 294 mode
1 = disable binomial filter
1 = fourth order binomial filter, 0 = 3rd order binomial filter
1 = 24-bit Noise Shaper output (pre-quantizer), 0 = 8/9/10-bit
quantizer output
1 = power stage test mode
1= roundup, 0 = truncate for quantizer
Reserved for future use.
1 = only change limiter gain value on zero cross.
Gain stepsize when incrementing or decrementing:
0 - 0.75 dB, 1 - 1.5 dB, 2 - 3.0 dB, 3 - 6.0 dB
1 = enable limiter (compressor)
1 = value in bits 6:0 is in 10ms units, otherwise 1ms units.
Timer value in units of 1 or 10ms.
Description
Description
Description
Description
V 0.91 10/10
92HD90