TAS5028 datasheet(30/84 Pages) TI

30 / 84 page

Introduction

SLES112 — June 2004

TAS5028

The interpolator, noise shaper, and PWM sections provide a PWM output with the following features:

•

Up to 8x over sampling.

8x at FS = 32 kHz, 38 kHz, 44.1 kHz, 48 kHz

4x at FS = 88.2 kHz, 96 kHz

2x at FS = 176.4 kHz, 192 kHz

•

5th order noise shaping

•

100-dB dynamic range 0 – 20 kHz (TAS5028 + TAS5111 system measured at speaker terminals)

•

THD < 0.01%

•

Adjustable maximum modulation limit of 93.8% to 99.2%

•

3.3-V digital signal

1.10.1

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 44.1-kHz sampling rate. The high-pass filter can be enabled and

disabled via the I2C interface.

1.10.2

De-Emphasis Filter

For audio sources that have been pre-emphasized, a precision 50

µs/15 µs de-emphasis filter is provided to

support the sampling rates of 32 kHz, 44.1 kHz, and 48 kHz. Figure 1 - 17 shows a graph of the de-emphasis

filtering characteristics. De-emphasis is set using two bits in the system control register.

-10

Frequency - kHz

3.18 (50

µs)

10.6 (15

µs)

Figure 1 - 17. De-emphasis Filter Characteristics

1.10.3

AM Interference Avoidance

Digital amplifiers can degrade AM reception as a result of their RF emissions. Texas Instruments patented AM

interference avoidance circuit provides a flexible system solution for a wide variety of digital audio

architectures. During AM reception, the TAS5028 adjusts the radiated emissions to provide an emission clear

zone for the tuned AM frequency. The inputs to the TAS5028 for this operation are the tuned AM frequency,

the IF frequency, and the sample rate. The sample rate is automatically detected.

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