MAX1108 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs

19-1399; Rev 0; 10/98
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
General Description
The MAX1108/MAX1109 low-power, 8-bit, dual-channel,
analog-to-digital converters (ADCs) feature an internal
track/hold (T/H) voltage reference, clock, and serial inter-
face. The MAX1108 is specified from +2.7V to +3.6V and
consumes only 105µA. The MAX1109 is specified from
+4.5V to +5.5V and consumes only 130µA. The analog
inputs are software configurable, allowing unipolar/bipolar
and single-ended/differential operation; battery monitor-
ing capability is also included.
The full-scale analog input range is determined by the
internal reference of +2.048V (MAX1108) or +4.096V
(MAX1109), or by an externally applied reference rang-
ing from 1V to V_DD. The MAX1108/MAX1109 also feature
a software power-down mode that reduces power con-
sumption to 0.5µA when the device is not in use. The
4-wire serial interface directly connects to SPI™, QSPI™,
and MICROWIRE™ devices without external logic.
Conversions up to 50ksps are performed using either the
internal clock or an external serial-interface clock.
The MAX1108 and MAX1109 are available in a 10-pin
µMAX package with a footprint that is just 20% of an
8-pin plastic DIP.
Applications
Portable Data Logging
Hand-Held Measurement Devices
Medical Instruments
System Diagnostics
Solar-Powered Remote Systems
4–20mA-Powered Remote Systems
Receive-Signal Strength Indicators
Pin Configuration
Features
o Single Supply: +2.7V to +3.6V (MAX1108)
+4.5V to +5.5V (MAX1109)
o Low Power: 105µA at +3V and 50ksps
0.5µA in Power-Down Mode
o Software-Configurable Unipolar or Bipolar Inputs
o Input Voltage Range: 0 to V_DD
o Internal Track/Hold
o Internal Reference: +2.048V (MAX1108)
+4.096V (MAX1109)
o Reference Input Range: 1V to V_DD
o SPI/QSPI/MICROWIRE-Compatible Serial Interface
o V_DD Monitoring Mode
o Small 10-Pin µMAX Package
PART
MAX1108CUB
MAX1108EUB
MAX1109CUB
MAX1109EUB
Ordering Information
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
10 µMAX
Functional Diagram
CS
SCLK
DIN
INPUT
SHIFT
REGISTER
V_DD
OUTPUT
SHIFT
REGISTER
DOUT
TOP VIEW
V_DD 1
CH0 2
CH1 3
GND 4
REF 5
MAX1108
MAX1109
µMAX
10 SCLK
9 DOUT
8 DIN
7 CS
6 COM
MAX1108
MAX1109
CONTROL
LOGIC
INTERNAL
OSCILLATOR
CH0
ANALOG
T/H
SAR
CH1
INPUT
MUX
COM
CHARGE
INTERNAL
REFERENCE
REDISTRIBUTION
DAC
REF
GND
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
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