19-1532; Rev 0; 9/99
KIT
ATION
EVALU
BLE
AVAILA
250ksps, +3V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
General Description
The MAX1291/MAX1293 low-power, 12-bit analog-to-
digital converters (ADCs) feature a successive-approxi-
mation ADC, automatic power-down, fast wake-up
(2µs), an on-chip clock, +2.5V internal reference, and a
high-speed, byte-wide parallel interface. They operate
with a single +3V analog supply and feature a V
LOGIC
pin that allows them to interface directly with a +1.8V to
+5.5V digital supply.
Power consumption is only 5.7mW (V
DD
= V
LOGIC
) at
the maximum sampling rate of 250ksps. Two software-
selectable power-down modes enable the MAX1291/
MAX1293 to be shut down between conversions;
accessing the parallel interface returns them to normal
operation. Powering down between conversions can
cut supply current to under 10µA at reduced sampling
rates.
Both devices offer software-configurable analog inputs
for unipolar/bipolar and single-ended/pseudo-differen-
tial operation. In single-ended mode, the MAX1291 has
8 input channels and the MAX1293 has 4 input chan-
nels (4 and 2 input channels, respectively, when in
pseudo-differential mode).
Excellent dynamic performance and low power com-
bined with ease of use and small package size make
these converters ideal for battery-powered and data-
acquisition applications or for other circuits with demand-
ing power consumption and space requirements.
The MAX1291 is available in a 28-pin QSOP package,
while the MAX1293 is available in a 24-pin QSOP. For
pin-compatible +5V, 12-bit versions, refer to the
MAX1290/MAX1292 data sheet.
o
12-Bit Resolution, ±0.5LSB Linearity
o
+3V Single Operation
o
User-Adjustable Logic Level (+1.8V to +3.6V)
o
Internal +2.5V Reference
o
Software-Configurable, Analog Input Multiplexer
8-Channel Single-Ended/
4-Channel Pseudo-Differential (MAX1291)
4-Channel Single-Ended/
2-Channel Pseudo-Differential (MAX1293)
o
Software-Configurable, Unipolar/Bipolar Inputs
o
Low Power: 1.7mA (250ksps)
1.0mA (100ksps)
400µA (10ksps)
2µA (Shutdown)
o
Internal 3MHz Full-Power Bandwidth Track/Hold
o
Byte-Wide Parallel (8+4) Interface
o
Small Footprint: 28-Pin QSOP (MAX1291)
24-Pin QSOP (MAX1293)
Features
MAX1291/MAX1293
Pin Configurations
TOP VIEW
HBEN 1
D7 2
D6 3
D5 4
28 V
LOGIC
27 V
DD
26 REF
25 REFADJ
24 GND
Applications
Industrial Control Systems
Energy Management
Data-Acquisition Systems
Data Logging
Patient Monitoring
Touch Screens
D4 5
D3/D11 6
D2/D10 7
D1/D9 8
D0/D8 9
MAX1291
23 COM
22 CH0
21 CH1
20 CH2
19 CH3
18 CH4
17 CH5
16 CH6
15 CH7
Ordering Information
PART
MAX1291ACEI
MAX1291BCEI
MAX1291AEEI
MAX1291BEEI
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
28 QSOP
28 QSOP
INL
(LSB)
±0.5
±1
±0.5
±1
INT 10
RD 11
WR 12
CLK 13
CS 14
QSOP
Pin Configurations continued at end of data sheet.
Ordering Information continued at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
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