STA381BWSTR STMicroelectronics, STA381BWSTR Datasheet - Page 107

• Manufacturer Part Number: STA381BWSTR
• Description: Audio DSPs Sound Terminal 2.1 High EFF Dig Audio
• Manufacturer: STMicroelectronics

Specifications of STA381BWSTR

• Product Category: Audio DSPs
• Rohs: yes
• Operating Supply Voltage: 4.5 V to 25.5 V
• Operating Temperature Range: 0 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: VQFN-48
• Snr: 100 dB

STA381BWS
7.1.2
7.1.3
Interpolation ratio select
Table 103. Internal interpolation ratio
The STA381BWS has variable interpolation (oversampling) settings such that internal
processing and FFX output rates remain consistent. The first processing block interpolates
by either 3 times (see
downsample. The oversampling ratio of this interpolation is determined by the IR bits.
Table 104. IR bit settings as a function of the input sampling rate
Fault-detect recovery bypass
Table 105. Fault-detect recovery bypass
The on-chip STA381BWS power output block provides feedback to the digital controller
using inputs to the power control block. The FAULT input is used to indicate a fault condition
(either overcurrent or thermal). When FAULT is asserted (set to 0), the power control block
attempts a recovery from the fault by asserting the tri-state output (setting it to 0 which
directs the power output block to begin recovery), holds it at 0 for period of time in the range
of 0.1 ms to 1 second as defined by the fault-detect recovery constant register (FDRC
registers 0x2B-0x2C), then toggles it back to 1. This sequence is repeated as long as the
fault indication exists. This feature is enabled by default, but can be bypassed by setting the
FDRB control bit to 1.
Bit
Bit
4:3
7
Input sampling rate fs (kHz)
R/W
R/W
R/W
R/W
176.4
44.1
88.2
192
32
48
96
RST
RST
0
00
Section
IR [1:0]
Name
Doc ID 018937 Rev 6
4.2), 2 times or 1 time (pass-through) or provides a 2 times
Name
FDRB
Register description: Sound Terminal compatibility
00
00
00
01
01
10
10
IR
Selects internal interpolation ratio based on input I
sampling frequency
0: fault-detect recovery enabled
1: fault-detect recovery disabled
1st stage interpolation ratio
2-times downsampling
2-times downsampling
2-times oversampling
2-times oversampling
2-times oversampling
Description
Pass-through
Pass-through
Description
2
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