MAX1338 Datasheet, PDF (11/24 Pages) Maxim Integrated Products – 14-Bit, 4-Channel, Software-Programmable, Multiranging, Simultaneous-Sampling ADC

14-Bit, 4-Channel, Software-Programmable,
Multiranging, Simultaneous-Sampling ADC
PIN
1, 7, 9, 17,
19
2
3
4
5
6, 8, 14, 16,
18, 20, 28
10
11
12
13
15
21
22
23
24
25
26
27
29
30
31
32
33
34
35
36
37
38
39
40
Pin Description
NAME
AV_DD
AIN0+
AIN0-
AIN1+
AIN1-
FUNCTION
Analog Power Input. AV_DD is the power input for the analog section of the converter. Connect a
+4.75V to +5.25V power supply to AV_DD. Bypass each AV_DD to AGND with a 0.1µF capacitor very
close to the device. Bypass AV_DD to AGND with a bulk capacitor of at least 4.7µF where power enters
the board. Connect all AV_DD pins to the same potential.
Channel 0 Differential Analog Input
Channel 0 Differential Analog Input
Channel 1 Differential Analog Input
Channel 1 Differential Analog Input
AGND Analog Ground. AGND is the power return for AV_DD. Connect all AGNDs to the same potential.
AIN2+
AIN2-
AIN3+
AIN3-
INTCLK/
EXTCLK
REFADC
REFP1
REFP2
COM1
COM2
REFN1
REFN2
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
Channel 2 Differential Analog Input
Channel 2 Differential Analog Input
Channel 3 Differential Analog Input
Channel 3 Differential Analog Input
Clock-Select Input. Force INTCLK/EXTCLK high for internal clock mode. Force INTCLK/EXTCLK low
for external clock mode.
ADC Reference Bypass or Input. REFADC is the bypass point for an internally generated reference
voltage. Bypass REFADC with a 1.0nF capacitor to AGND. REFADC can be driven externally by a
precision external voltage reference. See the Reference section and the Typical Operating Circuit.
Positive Differential Reference Bypass Point 1. Connect REFP1 to REFP2.
Positive Differential Reference Bypass Point 2. Connect REFP2 to REFP1. Bypass REFP2 with a 0.1µF
capacitor to AGND. Also bypass REFP2 to REFN2 with a 0.1µF capacitor.
Common-Mode Voltage Bypass Point 1. Connect COM1 to COM2.
Common-Mode Voltage Bypass Point 2. Connect COM2 to COM1. Connect a 1.0µF capacitor from
COM2 to AGND.
Negative Differential Reference Bypass Point 1. Connect REFN1 to REFN2.
Negative Differential Reference Bypass Point 2. Connect REFN2 to REFN1. Bypass REFN2 with a
0.1µF capacitor to AGND. Also bypass REFN2 to REFP2 with a 0.1µF capacitor.
Data Input/Output Bit 0 (LSB)
Data Input/Output Bit 1
Data Input/Output Bit 2
Data Input/Output Bit 3
Data Input/Output Bit 4
Data Input/Output Bit 5
Data Input/Output Bit 6
Data Input/Output Bit 7
Data Output Bit 8
Data Output Bit 9
Data Output Bit 10
Data Output Bit 11
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