Rainbow-electronics MAX1338 User Manual download pdf (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,

Analog Power Input. AV

is the power input for the analog section of the converter. Connect a

+4.75V to +5.25V power supply to AV

. Bypass each AV

to AGND with a 0.1µF capacitor very

close to the device. Bypass AV

to AGND with a bulk capacitor of at least 4.7µF where power enters

the board. Connect all AV

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

. 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

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

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 23 24

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Rainbow-electronics MAX1338 User Manual Page 11

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