MAX192 Maxim, MAX192 Datasheet - Page 9

• Manufacturer Part Number: MAX192
• Description: Low-Power / 8-Channel / Serial 10-Bit ADC
• Manufacturer: Maxim

Table 2. Channel Selection in Differential Mode (SGL/DIF = 0)
Table 3. Control-Byte Format
SEL2
Bit 7
(MSB)
START
Bit
7(MSB)
6
5
4
3
2
1
0(LSB)
0
0
0
0
1
1
1
1
SEL1
0
0
1
1
0
0
1
1
SEL2
Bit 6
Name
START
SEL2
SEL1
SEL0
UNI/BIP
SGL/DIF
PD1
PD0
_______________________________________________________________________________________
SEL0
0
1
0
1
0
1
0
1
Description
The first logic “1” bit after CS goes low defines the beginning of the control byte.
These three bits select which of the eight channels are used for the conversion.
See Tables 1 and 2.
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.
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.
Selects clock and power-down modes.
PD1
0
0
1
1
SEL1
Bit 5
CH0
+
–
PD0
0
1
0
1
CH1
+
–
SEL0
Bit 4
Mode
Full power-down (I
Fast power-down (I
Internal clock mode
External clock mode
CH2
+
–
Low-Power, 8-Channel,
UNI/BIP
Bit 3
CH3
+
–
Q
Q
= 2µA)
= 30µA)
Serial 10-Bit ADC
CH4
+
–
SGL/DIF
Bit 2
CH5
+
–
Bit 1
PD1
CH6
+
–
CH7
+
–
Bit 0
(LSB)
PD0
9