_______________Detailed Description

The MAX115/MAX116 use a successive-approximation

conversion technique and four simultaneous-sampling

track/hold (T/H) amplifiers to convert analog signals into

12-bit digital outputs. Each T/H has two multiplexed

inputs, allowing a total of eight inputs. Each T/H output

is converted and stored in memory to be accessed

sequentially by the parallel interface with successive

read cycles. The MAX115/MAX116 internal micro-

sequencer can be programmed to digitize one, two,

three, or four inputs sampled simultaneously from either

of the two banks of four inputs (Figure 2). The

MAX115/MAX116 can operate with either an external or

internal clock. For internal operation, connect CLK to

2x4-Channel, Simultaneous-Sampling

12-Bit ADCs

6

_______________________________________________________________________________________

______________________________________________________________Pin Description

Figure 1. Load Circuit for Access Time and Bus Relinquish Time

TO OUTPUT

PIN

120pF

1.0mA

1.6mA

1.6V

Channel 3 Multiplexed Inputs (single-ended)

CH3A, CH3B

34, 35

Channel 4 Multiplexed Inputs (single-ended)

CH4A, CH4B

32, 33

Analog Supply Voltage

31

Interrupt output. Falling edge indicates the end of a conversion sequence.

INT

30

Conversion-Start input. Rising edge initiates sampling and conversion sequence.

CONVST

29

Read Input (active-low)

RD

28

Write Input (active-low)

WR

27

Digital Ground

DGND

18

Data Bits

D3, D2

19, 20

Bidirectional Data Bits/Address Bits

D1/A3, D0/A2

21, 22

CLK

25

Chip-Select Input (active-low)

CS

26

Reference-Buffer output. Bypass with a 4.7µF capacitor to AGND.

REFOUT

7

Analog ground. Both pins must be connected to ground.

AGND

8, 36

Data Bits. D11 = MSB.

D11–D4

9–16

Digital Supply Voltage

17

External reference input/internal reference output. Bypass with a 0.1µF capacitor to AGND.

REFIN

6

Analog Supply Voltage

5

PIN

Channel 1 Multiplexed Inputs (single-ended)

CH1B, CH1A

3, 4

Channel 2 Multiplexed Inputs (single-ended)

CH2B, CH2A

1, 2

FUNCTION

NAME

Address Bits

A1, A0

23, 24