MAX1294 Datasheet, PDF (8/20 Pages) Maxim Integrated Products – 420ksps, +5V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface

420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
PIN
MAX1294 MAX1296
25
21
26
22
27
23
28
24
NAME
REF
V_DD
D11
D10
Pin Description (continued)
FUNCTION
Bandgap Reference Buffer Output/External Reference Input. Add a 4.7µF capacitor
to GND when using the internal reference.
Analog +5V Power Supply. Bypass with a 0.1µF capacitor to GND.
Three-State Digital Output (D11)
Three-State Digital Output (D10)
(CH5)
(CH4)
(CH3)
(CH2)
CH1
CH0
COM
CLK
ANALOG
INPUT
MULTIPLEXER
CLOCK
REF
REFADJ
17k
A_V =
1.22V
2.05
REFERENCE
T/H
CHARGE REDISTRIBUTION
12-BIT DAC
12
SUCCESSIVE-
APPROXIMATION
REGISTER
COMP
CS
WR
CONTROL LOGIC
&
RD
LATCHES
INT
MAX1294
MAX1296
12
V_DD
THREE-STATE, BIDIRECTIONAL
GND
I/O INTERFACE
D0–D11
12-BIT DATA BUS
( ) ARE FOR MAX1294 ONLY.
Figure 2. Simplified Functional Diagram
_______________Detailed Description
Converter Operation
The MAX1294/MAX1296 ADCs use a successive-approx-
imation (SAR) conversion technique and an input
track/hold (T/H) stage to convert an analog input signal to
a 12-bit digital output. This output format provides easy
interface to standard microprocessors (µPs). Figure 2
shows the simplified internal architecture of the MAX1294/
MAX1296.
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