Datasheet
_______________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
DV
DD
.
MAX115/MAX116
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, CH3B34, 35
Channel 4 Multiplexed Inputs (single-ended)CH4A, CH4B32, 33
Analog Supply VoltageAV
SS
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 GroundDGND18
Data BitsD3, D219, 20
Bidirectional Data Bits/Address BitsD1/A3, D0/A221, 22
Clock Input (duty cycle must be 30% to 70%). Connect CLK to DV
DD
to activate internal clock.CLK25
Chip-Select Input (active-low)
CS
26
Reference-Buffer output. Bypass with a 4.7µF capacitor to AGND.REFOUT7
Analog ground. Both pins must be connected to ground.AGND8, 36
Data Bits. D11 = MSB.D11–D49–16
Digital Supply VoltageDV
DD
17
External reference input/internal reference output. Bypass with a 0.1µF capacitor to AGND.REFIN6
Analog Supply VoltageAV
DD
5
PIN
Channel 1 Multiplexed Inputs (single-ended)CH1B, CH1A3, 4
Channel 2 Multiplexed Inputs (single-ended)CH2B, CH2A1, 2
FUNCTIONNAME
Address BitsA1, A023, 24