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参数资料
| 型号： | TAS5508PAGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 41/105页 |
| 文件大小： | 1286K |
| 代理商： | TAS5508PAGR |
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2.12.1 DC Blocking (High-Pass Enable/Disable)
2.12.2 De-Emphasis Filter
f – Frequency – kHz
3.18 (50
s)
0
10
10.6 (15
s)
De-emphasis
Response
–
dB
M0015-01
2.12.3 Power-Supply Volume Control (PSVC)
TAS5508
8-Channel Digital Audio PWM Processor
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
www.ti.com
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 FS = 44.1 kHz, 48 kHz, 32 kHz, 38 kHz
–
4
＝ at FS = 88.2 kHz, 96 kHz
–
2
＝ at FS = 176.4 kHz, 192 kHz
Fifth-order noise shaping
100-dB dynamic range 0–20 kHz (TAS5508 + TAS5111 system measured at speaker terminals)
THD < 0.01%
Adjustable maximum modulation limit of 93.8% to 99.2%
3.3-V digital signal
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 I2C interface.
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. Figure 2-19 shows a graph of the
de-emphasis filtering characteristics. De-emphasis is set using two bits in the system control register.
Figure 2-19. De-Emphasis Filter Characteristics
The TAS5508 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 I2C. When enabled, 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 show how power-supply and digital gains can be used together.
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.
Description
40
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