MAX1261 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – 250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface

19-2719; Rev 0; 04/03
250ksps, +3V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
General Description
The MAX1261/MAX1263 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 MAX1261/
MAX1263 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 MAX1261 has
eight input channels and the MAX1263 has four input
channels (four and two 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 MAX1261 is available in a 28-pin QSOP package,
while the MAX1263 is available in a 24-pin QSOP. For
pin-compatible +5V, 12-bit versions, refer to the
MAX1262/MAX1264 data sheet.
Industrial Control Systems
Energy Management
Data-Acquisition Systems
Applications
Data Logging
Patient Monitoring
Touch Screens
Ordering Information
PART
MAX1261ACEI
MAX1261BCEI
MAX1261AEEI
MAX1261BEEI
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
Ordering Information continued at end of data sheet.
Features
o 12-Bit Resolution, ±0.5 LSB 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 (MAX1261)
4-Channel Single Ended/
2-Channel Pseudo-Differential (MAX1263)
o Software-Configurable, Unipolar/Bipolar Inputs
o Low Power
1.9mA (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 (MAX1261)
24-Pin QSOP (MAX1263)
Pin Configurations
TOP VIEW
HBEN 1
D7 2
D6 3
D5 4
D4 5
D3/D11 6
D2/D10 7
D1/D9 8
D0/D8 9
INT 10
RD 11
WR 12
CLK 13
CS 14
MAX1261
28 V_LOGIC
27 V_DD
26 REF
25 REFADJ
24 GND
23 COM
22 CH0
21 CH1
20 CH2
19 CH3
18 CH4
17 CH5
16 CH6
15 CH7
QSOP
Pin Configurations continued at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.