TAS3002 datasheet(21/74 Pages) TI

21 / 74 page

3–1

3 Analog Input/Output

The TAS3002 device contains a stereo 24-bit ADC with two single-ended inputs per channel. Selection of the A or

B analog input is accomplished by setting a bit in the analog control register (ACR) by an I2C command. Additionally,

the TAS3002 device has a stereo 24-bit digital-to-analog converter (DAC).

3.1

Analog Input

Figure 3–1 shows the technique and components required for analog input to the TAS3002 device. The maximum

input signal must not exceed 0.7 Vrms. Selection of the above component values gives a frequency response from

20 Hz to 20 kHz at a sampling frequency of 48 kHz without alias frequency problems.

AINRP

AINRM

AINLM

AINLP

24-Bit

Stereo

ADC

RINA

RINB

AINRM

AINRP

AINLM

AINLP

LINA

LINB

Reference

Voltage

1200 pF

0.47

µF

0.47

µF

0.47

µF

0.47

µF

Analog Inputs – Use 0.47

µF for 20-Hz Cutoff

Anti-Alias Capacitors for fS = 48 kHz

Input Select Command

From Internal Controller

Tie unused analog inputs to analog ground through 0.1-

µF capacitors.

Figure 3–1. Analog Input to the TAS3002 Device

3.2

Analog Output

3.2.1

Direct Analog Output

The full scale analog output from the TAS3002 device is 0.707 Vrms. It is referenced to VCOM which is approximately

1.5 Vdc. VCOM must be decoupled with the network shown in Figure 3–2.

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