MAX1240 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – +2.7V, Low-Power, 12-Bit Serial ADCs in 8-Pin SO

19-1155; Rev 2; 11/98
EVAALVUAAILTAIOBNLEKIT
+2.7V, Low-Power,
12-Bit Serial ADCs in 8-Pin SO
__________________General Description
The MAX1240/MAX1241 are low-power, 12-bit analog-
to-digital converters (ADCs) 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
DIP and SO packages.
Battery-Powered Systems
Portable Data Logging
Isolated Data Acquisition
Process Control
Instrumentation
Applications
Pin Configuration
TOP VIEW
V_{DD 1}
AIN 2
SHDN 3
REF 4
MAX1240
MAX1241
8 SCLK
7 CS
6 DOUT
5 GND
DIP/SO
________________________________Features
o Single-Supply Operation:
+2.7V to +3.6V (MAX1240)
+2.7V to +5.25V (MAX1241)
o 12-Bit Resolution
o Internal 2.5V Reference (MAX1240)
o Small Footprint: 8-Pin DIP/SO Packages
o Low Power: 3.7µW (73ksps, MAX1240)
3mW (73ksps, MAX1241)
66µW (1ksps, MAX1241)
5µW (power-down mode)
o Internal Track/Hold
o SPI/QSPI/MICROWIRE 3-Wire Serial Interface
o Internal Clock
Ordering Information
PART
MAX1240ACPA
MAX1240BCPA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-
PACKAGE
8 Plastic DIP
8 Plastic DIP
INL
(LSB)
±¹/2
±1
MAX1240CCPA 0°C to +70°C 8 Plastic DIP ±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
MAX1240BC/D 0°C to +70°C Dice*
±1
Ordering Information continued at end of data sheet.
*Dice are specified at T_A = +25°C, DC parameters only.
CS ⁷
SCLK ⁸
SHDN ³
AIN ²
4
REF
Functional Diagram
V_DD
1
CONTROL
LOGIC
T/H
2.5V REFERENCE
(MAX1240 ONLY)
INT
CLOCK
12-BIT
SAR
OUTPUT
SHIFT
REGISTER
6
DOUT
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 free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].