Datasheet

Channel-6 Processing Section
B0050-01
0x21
0x0D
BQ1(G)
0x23
Gain-
Compensated
Biquad
0x24
Low-
Pass
Biquad
VOL
10dB
BassManagement
Ch1–5
Ch6Sub
FromDownmix(L’+R’)/2
S
BQ1 BQ2
MUX
PWM Section
TAS5086
SLES131C – FEBRUARY 2005 – REVISED JUNE 2008 ................................................................................................................................................... www.ti.com
Channel 6 has processing features that are directly applicable to the subwoofer channel.
Figure 7. Channel-6 Processing Block Diagram
The TAS5086 has six channels of high-performance digital PWM modulators that are designed to drive switching
output stages (back ends) in both single-ended (SE) and H-bridge (bridge-tied load) configurations. The
TAS5086 device uses noise-shaping and sophisticated error correction algorithms to achieve high power
efficiency and high-performance digital audio reproduction. The TAS5086 uses a fourth-order noise shaper to
provide >105-dB SNR performance from 20 Hz to 20 kHz.
The TAS5086 PWM interface is described by using the following notation:
PN + V
where
P = number of PWM signals per channel
N = number of channels
V = total number of valid signals used to reset the power stage
For example, the TAS5086 initial interface format means that there is 1 PWM signal per channel (N = 6) and 1
valid signal is used to reset the power stages. The shorthand notation to describe this is 1N+1.
The PWM section accepts 24-bit PCM data from the serial data interface and outputs six PWM audio output
channels to drive 1N+1 single-ended and BTL power stages.
The PWM interface supports:
• TAS5186 in BTL or SE mode without any external glue logic, uses 1N+1 signaling.
• TAS5142 in BTL or SE mode without any external glue logic, uses 1N+1 signaling.
• TAS5111 SE without any external glue logic, and with a pulldown on the output, uses 1N+1 signaling.
• TAS5111 BTL or TAS5112 BTL with one inverter per BTL channel of glue logic and a pulldown on the output,
uses 1N+1 signaling from TAS5086, 2N+1 input to TAS5111/12.
• TAS5112 SE (with external glue logic)
See the application schematics for an example of the TAS5086 with the TAS5186 and the TAS5086 with
TAS5112 SE and TAS5111 SE.
The TAS5086 has input multiplexers that allow any of the input channels to be routed to any PWM channel and
output multiplexers to enable any PWM output to be routed to any PWM output pin.
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Product Folder Link(s): TAS5086