MAX1110 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – +2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs

19-1194; Rev 2; 10/98
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+2.7V, Low-Power, Multichannel,
Serial 8-Bit ADCs
General Description
The MAX1110/MAX1111 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 +2.7V to +5.5V
supply and consume only 85µA while sampling at rates
up to 50ksps. The MAX1110’s 8 analog inputs and the
MAX1111’s 4 analog inputs are software-configurable,
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 2.048V 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 MAX1110/MAX1111 have a software-program-
mable, 2µA automatic power-down mode to minimize
power consumption. Using power-down, the supply
current is reduced to 6µA at 1ksps, and only 52µA at
10ksps. Power-down can also be controlled using the
SHDN input pin. Accessing the serial interface automat-
ically powers up the device.
The MAX1110 is available in 20-pin SSOP and DIP
packages. The MAX1111 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
Pin Configurations appear at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
____________________________Features
o +2.7V to +5.5V Single Supply
o Low Power: 85µA at 50ksps
6µA at 1ksps
o 8-Channel Single-Ended or 4-Channel Differential
Inputs (MAX1110)
o 4-Channel Single-Ended or 2-Channel Differential
Inputs (MAX1111)
o Internal Track/Hold; 50kHz Sampling Rate
o Internal 2.048V Reference
o SPI/QSPI/MICROWIRE-Compatible Serial Interface
o Software-Configurable Unipolar or Bipolar Inputs
o Total Unadjusted Error: ±1LSB max
±0.3LSB typ
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX1110CPP
0°C to +70°C
20 Plastic DIP
MAX1110CAP
0°C to +70°C
20 SSOP
MAX1110C/D
0°C to +70°C
Dice*
*Dice are specified at T_A = +25°C, DC parameters only.
Ordering Information continued at end of data sheet.
________________Functional Diagram
CS
SCLK
DIN
SHDN
CH0
CH1
CH2
CH3
CH4*
CH5*
CH6*
CH7*
COM
REFOUT
REFIN
INPUT
SHIFT
REGISTER
CONTROL
LOGIC
INT
CLOCK
ANALOG
INPUT
T/H
MUX
+2.048V
REFERENCE
OUTPUT
SHIFT
REGISTER
CLOCK
IN
8-BIT
SAR ADC
OUT
REF
MAX1110
MAX1111
DOUT
SSTRB
V_DD
DGND
AGND
*MAX1110 ONLY
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