TLC320AD50C-I Datasheet, PDF (28/53 Pages) Texas Instruments – SIGMA-DELTA ANALOG INTERFACE CIRCUITS WITH MASTER-SLAVE FUNCTION

ADC input. These input sources are selected by bits D4 and D5 of control register 1. The default condition self biases
the input since the register default value selects INP and INM as the source for both the ADC and monitor amplifier
input (see Figure 2–16). A simple single-pole antialias filter with low output impedance must be connected to INP and
INM (also AUXP and AUXM, if used).
VINP
VINM
INP
35 kΩ
2.5 V
35 kΩ
INM
Figure 2–16. INP and INM Internal Self-Biased (2.5 V) Circuit
2.9.1 Analog Output
The OUTP and OUTM are differential outputs and can drive a typical 600 Ω load directly. Figure 2–17 shows the circuit
when load is ground referenced.
10 kΩ
OUTM
OUTP
10 kΩ
10 kΩ
10 kΩ
5V
+
_
TLE2062
–5 V
Load
Figure 2–17. Differential Output Drive (Ground Referenced)
OUTP (Solid Line)
4V
(Virtual 0) 2.5 V
1V
OUTM (Dashed Line)
Digital Input Code
(+FS) 0111 1111 1111 1111
(Virtual 0) 0000 0000 0000 0000
(–FS) 1000 0000 0000 0000
Analog Output Voltage
OUT +
OUT –
4V
1V
2.5 V
2.5 V
1V
4V
Figure 2–18. Digital Input Code vs. Analog Output Voltage
2–12