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TLC320AC02C Datasheet, PDF (49/84 Pages) Texas Instruments – Single-Supply Analog Interface Circuit | |||
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4 Parameter Measurement Information
R
IN + or AUX IN +
R
IN â or AUX IN â
Rfb
_
+
_
+
Rfb
To Multiplexer
Rfb = R for DS03 = 0 and DS02 = 1
Rfb = 2R for DS03 = 1 and DS02 = 0
Rfb = 4R for DS03 = 1 and DS02 = 1
R = 100 k⦠nominal
Figure 4 â 1. IN + and IN â Gain-Control Circuitry
Table 4 â 1. Gain Control (Analog Input Signal Required for
Full-Scale Bipolar A /D-Conversion 2s Complement)â
INPUT CONFIGURATION
CONTROL REGISTER 4
ANALOG INPUTâ¡
DS03
DS02
A /D CONVERSION
RESULT
0
0
All
Squelch
Differential configuration
Analog input = IN + â IN â
0
1
VID = ± 3 V
± Full scale
= AUX IN + â AUX IN â
1
0
VID = ± 1.5 V
± Full scale
1
1
VID = ± 0.75 V
± Full scale
0
0
All
Squelch
Single-ended configuration§
Analog input = IN + â VMID
= AUX IN + â VMID
0
1
VI = ± 1.5 V
± Half scale
1
0
VI = ± 1.5 V
± Full scale
1
1
VI = ± 0.75 V
± Full scale
â VDD = 5 V
â¡ VID = differential input voltage, VI = input voltage referenced to ADC VMID with IN â or AUX IN â connected to
ADC VMID. In order to minimize distortion, it is recommended that the analog input not exceed 0.1 dB below full scale.
§ For single-ended inputs, the analog input voltage should not exceed the supply rails. All single-ended inputs should be
referenced to the internal reference voltage, ADC VMID, for best common-mode performance.
4â1
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