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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 I
2
C 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 V
rms
. 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
1200 pF
0.47 µF
0.47 µF
1
1
0.47 µF
0.47 µF
1
1
2
2
1 Analog Inputs − Use 0.47 µF for 20-Hz Cutoff
2
Anti-Alias Capacitors for f
S
= 48 kHz
Input Select Command
From Internal Controller
3 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 V
rms
. It is referenced to VCOM which is approximately
1.5 Vdc. VCOM must be decoupled with the network shown in Figure 3−2.