Datasheet

R
1
1 Fm
+
AnalogInput-
(1V )
RMS
VIN-
(1V )
RMS
R
1
1 Fm
+
AnalogInput+
(1V )
RMS
VIN+
(1V )
RMS
C
1
R
1
1.5kW
1.5kW
470pF
10 Fm
0.1 Fm
R
1
4.7kW
4.7kW
470pF
R
3
R
2
C
1
R
3
R
2
C
1
C
2
VIN-
(1V )
RMS
VIN+
(1V )
RMS
VCOMAD
AnalogInput
(2V )
RMS
+
PCM3168A
PCM3168A-Q1
SBAS452 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com
Typical interface circuits for analog input and analog output are shown in Figure 58 through Figure 63 .
R
1
= 47- Ω to 470- Ω resistor, C
1
= 0.01-pF to 0.001- µ F capacitor; f
– 3 dB
= 160 kHz.
NOTE: The signal source impedance must be low enough to apply this configuration.
Figure 58. Basic Differential Input Circuit with Anti-Aliasing LPF for Differential ADC Input
Amplifier is an NE5532A x2 or OPA2134 x2; R
1
= 1.5-k Ω resistor; R
2
= 750- Ω resistor; R
3
= 47- Ω resistor; C
1
= 3300-pF capacitor; C
2
=
0.01- µ F capacitor; Gain = 1; f
– 3 dB
= 45 kHz.
Figure 59. Single-Ended to Differential Buffer and Anti-Aliasing LPF for Differential ADC Input
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