MAX1204 Maxim, MAX1204 Datasheet - Page 11

• Manufacturer Part Number: MAX1204
• Description: 5v / 8-cHANNEL / sERIAL / 10-bIT adc WITH 3v dIGITAL iNTERFACE
• Manufacturer: Maxim

Table 3. Channel Selection in Single-Ended Mode (SGL/DIF = 1)
Table 4. Channel Selection in Differential Mode (SGL/DIF = 0)
Table 2. Control-Byte Format
SEL2
0
1
0
1
0
1
0
1
SEL2
7 (MSB)
0 (LSB)
START
(MSB)
0
0
0
0
1
1
1
1
Bit 7
Bit
6
5
4
3
2
1
SEL1
0
0
0
0
1
1
1
1
SEL1
0
0
1
1
0
0
1
1
SEL0
______________________________________________________________________________________
0
0
1
1
0
0
1
1
SGL/DIF
UNI/BIP
START
Name
SEL 2
SEL2
SEL1
SEL0
Bit 6
PD1
PD0
CH0
SEL0
+
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 is used for the conversion
(Tables 3 and 4).
1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, an
analog input signal from 0V to V
from -V
1 = single ended, 0 = differential. Selects single-ended or differential conversions. In single-
ended mode, input signal voltages are referred to GND. In differential mode, the voltage dif-
ference between two channels is measured. (Tables 3 and 4.)
Selects clock and power-down modes.
PD1
0
0
1
1
SEL 1
Bit 5
5V, 8-Channel, Serial, 10-Bit ADC
CH1
+
CH0
REF
+
–
PD0
0
1
0
1
/ 2 to +V
CH2
+
CH1
+
SEL 0
–
REF
Bit 4
Mode
Full power-down (I
Fast power-down (I
Internal clock mode
External clock mode
/ 2.
with 3V Digital Interface
CH3
+
CH2
+
–
REF
UNI/BIP
Bit 3
can be converted; in bipolar mode, the signal can range
CH4
+
Description
DD
CH3
DD
+
–
= 2µA, internal reference)
= 30µA, internal reference)
CH5
SGL/DIF
+
Bit 2
CH4
+
–
CH6
+
CH5
+
–
Bit 1
PD1
CH7
+
CH6
+
–
(LSB)
Bit 0
PD0
GND
CH7
–
–
–
–
–
–
–
–
+
–
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