參數(shù)資料
型號(hào)： TAS5508BPAGR
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 37/103頁(yè)
文件大?。?/td> 1198K
代理商： TAS5508BPAGR
2.12.1 DC Blocking (High-Pass Filter 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)
TAS5508B
8-Channel Digital Audio PWM Processor
www.ti.com
SLES162C – DECEMBER 2005 – 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
S = 44.1 kHz, 48 kHz, 32 kHz, 38 kHz
–
4
× at f
S = 88.2 kHz, 96 kHz
–
2
× at f
S = 176.4 kHz, 192 kHz
Fifth-order noise shaping
100-dB dynamic range 0–20 kHz (TAS5508B + 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 system control register 1 (0x03 bit D7). The default setting is 1
(high-pass filter enabled).
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 TAS5508B 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 PSVC 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, –18, or –24 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. Note that if the PVSC function is not used, the volume biquad
should be all-pass (default).
Description
39
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參數(shù)描述
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TAS5508CPAG 功能描述:音頻 DSP 8Ch PWM Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
TAS5508CPAGR 功能描述:音頻 DSP 8Ch PWM Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
TAS5508CPAGR 制造商:Texas Instruments 功能描述:IC Digital Audio PWM Processor 64-TQFP
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