Rainbow Electronics MAX1338 - Manual (Page 11)

MAX1338
14-Bit, 4-Channel, Software-Programmable,
Multiranging, Simultaneous-Sampling ADC
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Pin Description
PIN NAME FUNCTION
1, 7, 9, 17,
19
AV DD
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.
2 AIN0+ Channel 0 Differential Analog Input
3 AIN0- Channel 0 Differential Analog Input
4 AIN1+ Channel 1 Differential Analog Input
5 AIN1- Channel 1 Differential Analog Input
6, 8, 14, 16,
18, 20, 28
AGND Analog Ground. AGND is the power return for AV DD . Connect all AGNDs to the same potential.
10 AIN2+ Channel 2 Differential Analog Input
11 AIN2- Channel 2 Differential Analog Input
12 AIN3+ Channel 3 Differential Analog Input
13 AIN3- Channel 3 Differential Analog Input
15
INTCLK/
EXTCLK Clock-Select Input. Force INTCLK/EXTCLK high for internal clock mode. Force INTCLK/EXTCLK low
for external clock mode.
21 REFADC
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.
22 REFP1 Positive Differential Reference Bypass Point 1. Connect REFP1 to REFP2.
23 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.
24 COM1 Common-Mode Voltage Bypass Point 1. Connect COM1 to COM2.
25 COM2
Common-Mode Voltage Bypass Point 2. Connect COM2 to COM1. Connect a 1.0µF capacitor from
COM2 to AGND.
26 REFN1 Negative Differential Reference Bypass Point 1. Connect REFN1 to REFN2.
27 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.
29 D0 Data Input/Output Bit 0 (LSB)
30 D1 Data Input/Output Bit 1
31 D2 Data Input/Output Bit 2
32 D3 Data Input/Output Bit 3
33 D4 Data Input/Output Bit 4
34 D5 Data Input/Output Bit 5
35 D6 Data Input/Output Bit 6
36 D7 Data Input/Output Bit 7
37 D8 Data Output Bit 8
38 D9 Data Output Bit 9
39 D10 Data Output Bit 10
40 D11 Data Output Bit 11