Datasheet

MAX192

Low-Power, 8-Channel,

Serial 10-Bit ADC

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Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(MSB) (LSB)

START SEL2 SEL1 SEL0 UNI/BIP SGL/DIF PD1 PD0

Bit Name Description

7(MSB) START The first logic “1” bit after CS goes low defines the beginning of the control byte.

6 SEL2 These three bits select which of the eight channels are used for the conversion.

5 SEL1 See Tables 1 and 2.

4 SEL0

3 UNI/BIP 1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar

mode, an analog input signal from 0V to VREF can be converted; in differential bipolar

mode, the differential signal can range from -VREF / 2 to +VREF / 2. Select differential

operation if bipolar mode is used.

2 SGL/DIF 1 = single ended, 0 = differential. Selects single-ended or differential conversions. In

single-ended mode, input signal voltages are referred to AGND. In differential mode,

the voltage difference between two channels is measured. Select unipolar operation

if single-ended mode is used. See Tables 1 and 2.

1 PD1 Selects clock and power-down modes.

0(LSB) PD0 PD1

PD0 Mode

0 0 Full power-down (I

= 2µA)

0 1 Fast power-down (I

= 30µA)

1 0 Internal clock mode

1 1 External clock mode

Table 3. Control-Byte Format

Table 2. Channel Selection in Differential Mode (SGL/DIF = 0)

SEL2 SEL1 SEL0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7

0 0 0 + –

0 0 1 + –

0 1 0 + –

0 1 1 + –

1 0 0 – +

1 0 1 – +

1 1 0 – +

1 1 1 – +