Rainbow Electronics MAX1113 - Manual

General Description
The MAX1112/MAX1113 are low-power, 8-bit, 8-chan-
nel analog-to-digital converters (ADCs) that feature an
internal track/hold, voltage reference, clock, and serial
interface. They operate from a single +4.5V to +5.5V
supply and consume only 135µA while sampling at
rates up to 50ksps. The MAX1112’s 8 analog inputs
and the MAX1113’s 4 analog inputs are software-con-
figurable, allowing unipolar/bipolar and single-
ended/differential operation.
Successive-approximation conversions are performed
using either the internal clock or an external serial-inter-
face clock. The full-scale analog input range is deter-
mined by the 4.096V internal reference, or by an
externally applied reference ranging from 1V to V
DD .
The 4-wire serial interface is compatible with the SPI™,
QSPI™, and MICROWIRE™ serial-interface standards.
A serial-strobe output provides the end-of-conversion
signal for interrupt-driven processors.
The MAX1112/MAX1113 have a software-program-
mable, 2µA automatic power-down mode to minimize
power consumption. Using power-down, the supply
current is reduced to 13µA at 1ksps, and only 82µA at
10ksps. Power-down can also be controlled using the
SHDN input pin. Accessing the serial interface automat-
ically powers up the device.
The MAX1112 is available in 20-pin SSOP and DIP
packages. The MAX1113 is available in small 16-pin
QSOP and DIP packages.
________________________Applications
Portable Data Logging
Hand-Held Measurement Devices
Medical Instruments
System Diagnostics
Solar-Powered Remote Systems
4–20mA-Powered Remote
Data-Acquisition Systems
____________________________Features
♦ +4.5V to +5.5V Single Supply
♦ Low Power: 135µA at 50ksps
13µA at 1ksps
♦ 8-Channel Single-Ended or 4-Channel Differential
Inputs (MAX1112)
♦ 4-Channel Single-Ended or 2-Channel Differential
Inputs (MAX1113)
♦ Internal Track/Hold; 50kHz Sampling Rate
♦ Internal 4.096V Reference
♦ SPI/QSPI/MICROWIRE-Compatible Serial Interface
♦ Software-Configurable Unipolar or Bipolar Inputs
♦ Total Unadjusted Error: ±1LSB (max)
±0.3LSB (typ)
MAX1112/MAX1113
+5V, Low-Power, Multi-Channel,
Serial 8-Bit ADCs
________________________________________________________________ Maxim Integrated Products 1
INPUT
SHIFT
REGISTER CONTROL
LOGIC
INT
CLOCK
OUTPUT
SHIFT
REGISTER
+4.096V
REFERENCE
T/H
ANALOG
INPUT
MUX
8-BIT
SAR ADC
IN
DOUT
SSTRB
V DD
DGND
AGND
SCLK
DIN
CH0
CH1
CH3
CH2
CH7*
CH6*
CH5*
CH4*
COM
REFOUT
*MAX1112 ONLY
REFIN
OUT
REF
CLOCK
MAX1112
MAX1113
CS
SHDN
Functional Diagram
19-1231; Rev 1; 10/98
PART
MAX1112 CPP
MAX1112CAP 0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
20 Plastic DIP
20 SSOP
EVALUATION KIT
AVAILABLE
Ordering Information
Ordering Information continued at end of data sheet.
* Dice are specified at T A = +25°C, DC parameters only.
Pin Configurations appear at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
MAX1112C/D 0°C to +70°C Dice*
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.