TLC320AC02IPM datasheet(49/84 Pages) TI

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4–1

Parameter Measurement Information

IN + or AUX IN +

IN – or AUX IN –

To Multiplexer

Rfb

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

Ω nominal

Figure 4 – 1. IN + and IN – Gain-Control Circuitry

Table 4 – 1. Gain Control (Analog Input Signal Required for

Full-Scale Bipolar A /D-Conversion 2s Complement)†

INPUT CONFIGURATION

CONTROL REGISTER 4

ANALOG INPUT‡

A /D CONVERSION

INPUT CONFIGURATION

DS03

DS02

ANALOG INPUT‡

RESULT

All

Squelch

Differential configuration

Analog input = IN +

VID = ± 3 V

±Full scale

Analog input = IN + – IN –

= AUX IN + – AUX IN –

VID = ± 1.5 V

±Full scale

AUX IN +

AUX IN

VID = ± 0.75 V

±Full scale

All

Squelch

Single-ended configuration§

Analog input

IN +

VI = ± 1.5 V

±Half scale

Analog input = IN + – VMID

= AUX IN + – VMID

VI = ± 1.5 V

±Full scale

= AUX IN +

VMID

VI = ± 0.75 V

±Full scale

† VDD = 5 V

‡ VID = differential input voltage, VI = input voltage referenced to ADC VMID with IN– or AUX IN– 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.

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