Datasheet

Gain Coefficient
48
Select
Output
N
28
48
Gain Coefficient
48
28
48
Output
Select
Output
N
1, 2, 3, 4, 5, or 6
Gain Coefficient
48
Select
Output
N
28
48
Gain Coefficient
48
28
48
Output
Select
Output
N
7 or 8
48
Gain Coefficient
48
Select
Output
N
28
M0011-02
TAS5508C
www.ti.com SLES257–SEPTEMBER 2010
Figure 2-18. Output Mixers
2.12 PWM
The TAS5508C has eight 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 TAS5508C device uses noise-shaping and sophisticated, error-correction algorithms
to achieve high power efficiency and high-performance digital audio reproduction. The TAS5508C uses an
AD1 PWM modulation scheme combined with a fifth-order noise shaper to provide a 102-dB SNR from
20 Hz to 20 kHz.
The PWM section accepts 32-bit PCM data from the DAP and outputs eight PWM audio output channels
configurable as either:
• Six channels to drive power stages and two channels to drive a differential-input active filter to provide
a separately controllable stereo lineout
• Eight channels to drive power stages
The TAS5508C PWM section output supports both single-ended and bridge-tied loads.
The PWM section provides a headphone PWM output to drive an external differential amplifier like the
TPA112. The headphone circuit uses the PWM modulator for channels 1 and 2. The headphone does not
operate while the six or eight back-end drive channels are operating. The headphone is enabled via a
headphone-select terminal or I
2
C command.
The PWM section has individual channel dc blocking filters that can be enabled and disabled. The filter
cutoff frequency is less than 1 Hz.
The PWM section has individual channel de-emphasis filters for 32, 44.1, and 48 kHz that can be enabled
and disabled.
Copyright © 2010, Texas Instruments Incorporated Description 39
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