MAX1280 Maxim, MAX1280 Datasheet - Page 14

• Manufacturer Part Number: MAX1280
• Description: MAX1280 Evaluation System
• Manufacturer: Maxim

Serial 12-Bit ADCs with Internal Reference
Table 1. Control-Byte Format
Table 2. Channel Selection in Single-Ended Mode (SGL/DIF = 1)
Table 3. Channel Selection in Psuedo-Differential Mode (SGL/DIF = 0)
14
SEL2
SEL2
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
BIT 7
(MSB)
START
BIT
7 (MSB)
6
5
4
3
2
1
0 (LSB)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
______________________________________________________________________________________
SEL1
SEL1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
NAME
START
SEL2
SEL1
SEL0
UNI/BIP
SGL/DIF
PD1
PD0
BIT 6
SEL2
SEL0
SEL0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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 (Tables 2 and 3).
1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, an
analog input signal from 0 to V
range from -V
1 = single ended, 0 = differential. Selects single-ended or differential conversions. In single-
ended mode, input signal voltages are referred to COM. In differential mode, the voltage
difference between two channels is measured (Tables 2 and 3).
Select operating mode.
PD1
0
0
1
1
BIT 5
SEL1
CH0
CH0
+
+
–
PD0
0
1
0
1
CH1
CH1
+
REF
+
–
/2 to +V
BIT 4
SEL0
Mode
Full power-down
Fast power-down
Reduced Power
Normal Operation
CH2
+
REF
CH2
+
–
/2.
REF
can be converted; in bipolar mode, the differential signal can
CH3
DESCRIPTION
+
BIT 3
UNI/BIP
CH3
+
–
CH4
+
CH4
+
–
BIT 2
SGL/DIF
CH5
+
CH5
+
–
CH6
+
BIT 1
PD1
CH6
+
–
CH7
+
CH7
+
BIT 0
(LSB)
PD0
–
COM
–
–
–
–
–
–
–
–