19-1155; Rev 3; 3/10
KIT
ATION
EVALU
BLE
AVAILA
+2.7V, Low-Power,
12-Bit Serial ADCs in 8-Pin SO
________________________________Features
♦
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 DIP/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
__________________General Description
The MAX1240/MAX1241 low-power, 12-bit analog-to-
digital converters (ADCs) are available in 8-pin pack-
ages. 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 ser-
ial interface.
Power consumption is only 37mW (V
DD
= 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 V
REF
, and the reference
input range includes the positive supply rail. An exter-
nal 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 com-
bined with ease of use and small package size make
these converters ideal for remote-sensor and data-
acquisition applications, or for other circuits with
demanding power consumption and space require-
ments. The MAX1240/MAX1241 are available in 8-pin
PDIP and SO packages.
MAX1240/MAX1241
Ordering Information
PART*
MAX1240ACPA+
MAX1240BCPA+
MAX1240CCPA+
MAX1240ACSA+
MAX1240BCSA+
MAX1240CCSA+
MAX1240BC/DDD
MAX1240AESA/V+**
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
PIN-
PACKAGE
8 PDIP
8 PDIP
8 PDIP
8 SO
8 SO
8 SO
Dice*
8 SO
INL
(LSB)
±1/2
±1
±1
±1
±1/2
±1
±1
±1/2
Applications
Battery-Powered Systems
Portable Data Logging
Isolated Data Acquisition
Process Control
Instrumentation
MAX1240BESA/V+** -40°C to +85°C 8 SO
±1
Ordering Information continued at end of data sheet.
*Dice
are specified at T
A
= +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.
Functional Diagram
V
DD
1
Pin Configuration
TOP VIEW
V
DD
AIN
1
2
8
7
SCLK
CS
DOUT
GND
CS
SCLK
SHDN
7
8
3
CONTROL
LOGIC
INT
CLOCK
OUTPUT
SHIFT
REGISTER
6
DOUT
SHDN 3
REF 4
MAX1240
MAX1241
6
5
AIN
2
T/H
2.5V REFERENCE
(MAX1240 ONLY)
12-BIT
SAR
REF
4
MAX1240
MAX1241
5
GND
DIP/SO
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
