IC DGTL AUDIO PWM PROC 64-TQFP

TAS5508APAG

Manufacturer Part NumberTAS5508APAG
DescriptionIC DGTL AUDIO PWM PROC 64-TQFP
ManufacturerTexas Instruments
TypePWM Processor
TAS5508APAG datasheet
 


Specifications of TAS5508APAG

ApplicationsDVDMounting TypeSurface Mount
Package / Case64-TQFP, 64-VQFPFor Use WithTAS5342DDV6EVM - TAS5342DDV6EVMTAS5508-5142K7EVM - EVAL MODULE FOR TAS5508B/TAS5142TAS5508-5122C6EVM - EVAL MODULE FOR TAS5508B/TAS5122TAS5508-5121K8EVM - EVAL MODULE FOR TAS5508B/TAS5121
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names296-17475
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TAS5508A
8-Channel Digital Audio PWM Processor
SLES119A – FEBRUARY 2004 – REVISED JULY 2009
The PWM section also contains the power-supply volume control (PSVC) PWM.
The interpolator, noise shaper, and PWM sections provide a PWM output with the following features:
Up to 8 oversampling
– 8 at F
= 44.1 kHz, 48 kHz, 32 kHz, 38 kHz
S
– 4 at F
= 88.2 kHz, 96 kHz
S
– 2 at F
= 176.4 kHz, 192 kHz
S
Fifth-order noise shaping
100-dB dynamic range 0–20 kHz (TAS5508A + TAS5111 system measured at speaker terminals)
THD < 0.01%
Adjustable maximum modulation limit of 93.8% to 99.2%
3.3-V digital signal
2.12.1 DC Blocking (High-Pass Enable/Disable)
Each input channel incorporates a first-order, digital, high-pass filter to block potential dc components. The
filter –3-dB point is approximately 0.89-Hz at the 44.1-kHz sampling rate. The high-pass filter can be
enabled and disabled via the I
2.12.2 De-Emphasis Filter
For audio sources that have been pre-emphasized, a precision 50- s/15- s de-emphasis filter is provided
to support the sampling rates of 32 kHz, 44.1 kHz, and 48 kHz.
de-emphasis filtering characteristics. De-emphasis is set using two bits in the system control register.
0
−10
Figure 2-19. De-Emphasis Filter Characteristics
2.12.3 Power-Supply Volume Control (PSVC)
The TAS5508A supports volume control both by conventional digital gain/attenuation and by a
combination of digital and analog gain/attenuation. Varying the H-bridge power-supply voltage performs
the analog volume control function. The benefits of using power-supply volume control (PSVC) are
reduced idle channel noise, improved signal resolution at low volumes, increased dynamic range, and
reduced radio frequency emissions at reduced power levels. The PSVC is enabled via I
the PSCV provides a PWM output that is filtered to provide a reference voltage for the power supply. The
power-supply adjustment range can be set for –12.04, –18.06, or –24.08 dB, to accommodate a range of
variable power-supply designs.
Figure 2-20
and
Figure 2-21
The volume biquad (0xCF) can be used to implement a low-pass filter in the digital volume control to
match the PSVC volume transfer function.
40
Description
2
C interface.
3.18 (50 s)
10.6 (15 s)
f – Frequency – kHz
show how power-supply and digital gains can be used together.
www.ti.com
Figure 2-19
shows a graph of the
De-emphasis
M0015-01
2
C. When enabled,
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