STA326 STMicroelectronics, STA326 Datasheet - Page 20

• Manufacturer Part Number: STA326
• Description: DIG AUDIO SYSTEM, 2-CH, 36POWERSSOP
• Manufacturer: STMicroelectronics

Specifications of STA326

• Svhc: No SVHC (15-Dec-2010)
• No. Of Pins: 36
• Operating Temperature Range: -20°C To +85°C
• Supply Voltage Max: 36V
• Supply Voltage Min: 10V
• Termination T: RoHS Compliant
• Package / Case: PowerSO
• Interface: I2C
• Interface Type: I2C
• Rohs Compliant: Yes

Register description
20/57
bits determine the PLL factor generating the internal clock and the IR bit determines the
oversampling ratio used internally.
Table 11.
Table 12.
The STA326 has variable interpolation (re-sampling) settings such that internal processing
and DDX
times or 1 time (pass-through) or provides a down-sample by a factor of 2.
The IR bits determine the re-sampling ratio of this interpolation.
Table 13.
Table 14.
If the thermal warning adjustment is enabled (TWAB = 0), then the thermal warning
recovery will determine if the adjustment is removed when thermal warning is negative. If
TWRB = 0 and TWAB = 0, then when a thermal warning disappears the gain adjustment
determined by the thermal warning postscale (default = -3 dB) will be removed and the gain
will be added back to the system. If TWRB = 1 and TWAB = 0, then when a thermal warning
disappears the thermal warning postscale gain adjustment will remain until TWRB is
changed to zero or the device is reset.
32, 44.1, 48
88.2, 96
176.4, 192
4:3
32
44.1
48
88.2
96
176.4
192
5
Input sample rate fs (kHz)
Bit
Bit
Input sample rate
RW
R/W
RW
fs (kHz)
R/W
®
output rates remain consistent. The first processing block interpolates by either 2
IR and MCS settings for input sample rate and clock rate
Interpolation ratio select
IR bit settings as a function of input sample rate
Thermal warning recovery bypass
1
RST
00
RST
TWRB
IR[1:0]
Name
Name
00
01
1X
IR
00
00
00
01
01
10
10
Doc ID 11531 Rev 3
IR[1,0]
768 fs
384 fs
384 fs
Thermal warning recovery bypass:
0: thermal warning recovery enabled
1: thermal warning recovery disabled
Interpolation ratio select: selects internal interpolation ratio
based on input
000
2 times over-sampling
2 times over-sampling
2 times over-sampling
Pass-through
Pass-through
Down-sampling by 2
Down-sampling by 2
512 fs
256 fs
256 fs
001
I
2
S
sample frequency
384 fs
192 fs
192 fs
1
st
010
stage interpolation ratio
Description
Description
MCS[2:0]
256 fs
128 fs
128 fs
011
128 fs
64 fs
64 fs
100
576 fs
-
-
STA326
101