19-1155; Rev 5; 8/10
KIT
ATION
EVALU
BLE
AVAILA
+2.7V, Low-Power,
12-Bit Serial ADCs in 8-Pin SO
________________________________Features
The MAX1240/MAX1241 low-power, 12-bit analog-todigital converters (ADCs) are available in 8-pin packages. The MAX1240 operates with a single +2.7V to
+3.6V supply, and the MAX1241 operates with a single
+2.7V to +5.25V supply. Both devices feature a 7.5µs
successive-approximation ADC, a fast track/hold
(1.5µs), an on-chip clock, and a high-speed, 3-wire serial interface.
Power consumption is only 37mW (VDD = 3V) at the
73ksps maximum sampling speed. A 2µA shutdown
mode reduces power at slower throughput rates.
The MAX1240 has an internal 2.5V reference, while the
MAX1241 requires an external reference. The MAX1241
accepts signals from 0V to VREF, and the reference
input range includes the positive supply rail. An external clock accesses data from the 3-wire interface,
which connects directly to standard microcontroller I/O
ports. The interface is compatible with SPI™, QSPI™,
and MICROWIRE™.
Excellent AC characteristics and very low power combined with ease of use and small package size make
these converters ideal for remote-sensor and dataacquisition applications, or for other circuits with
demanding power consumption and space requirements. The MAX1240/MAX1241 are available in 8-pin
PDIP and SO packages.
♦ Single-Supply Operation:
+2.7V to +3.6V (MAX1240)
+2.7V to +5.25V (MAX1241)
♦ 12-Bit Resolution
♦ Internal 2.5V Reference (MAX1240)
♦ Small Footprint: 8-Pin PDIP/SO Packages
♦ Low Power: 3.7µW (73ksps, MAX1240)
3mW (73ksps, MAX1241)
66µW (1ksps, MAX1241)
5µW (power-down mode)
♦ Internal Track/Hold
♦ SPI/QSPI/MICROWIRE 3-Wire Serial Interface
♦ Internal Clock
Ordering Information
PART*
TEMP RANGE
Battery-Powered Systems
Portable Data Logging
Isolated Data Acquisition
INL
(LSB)
MAX1240ACPA+
0°C to +70°C
8 PDIP
±1/2
MAX1240BCPA+
0°C to +70°C
8 PDIP
±1
MAX1240CCPA+
0°C to +70°C
8 PDIP
±1
MAX1240ACSA+
0°C to +70°C
8 SO
±1/2
MAX1240BCSA+
0°C to +70°C
8 SO
±1
MAX1240CCSA+
0°C to +70°C
8 SO
±1
0°C to +70°C
Dice*
±1
-40°C to +85°C
8 SO
±1/2
MAX1240CC/D
MAX1240AESA/V+**
Applications
PINPACKAGE
MAX1240BESA/V+
-40°C to +85°C 8 SO
±1
Ordering Information continued at end of data sheet.
*Dice are specified at TA = +25°C, DC parameters only.
**Future product—contact factory for availability.
/V denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Process Control
Functional Diagram
Instrumentation
VDD
1
Pin Configuration
CS
SCLK
TOP VIEW
SHDN
VDD
1
AIN
2
SHDN 3
8
DOUT
5
REF 4
CS
6
3
GND
AIN
REF
PDIP/SO
8
INT
CLOCK
CONTROL
LOGIC
SCLK
7
MAX1240
MAX1241
7
2
4
T/H
OUTPUT
SHIFT
REGISTER
6
DOUT
12-BIT
SAR
2.5V REFERENCE
(MAX1240 ONLY)
MAX1240
MAX1241
5
GND
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX1240/MAX1241
__________________General Description
