EVALUATION KIT AVAILABLE
MAX11156
18-Bit, 500ksps, ±5V SAR ADC
with Internal Reference in TDFN
General Description
The MAX11156 18-bit, 500ksps, SAR ADC offers excellent
AC and DC performance with true bipolar input range,
small size, and internal reference. The MAX11156 measures
a ±5V (10VP-P) input range while operating from a
single 5V supply. A patented charge-pump architecture
allows direct sampling of high-impedance sources. The
MAX11156 integrates an optional internal reference and
buffer, saving additional cost and space.
This ADC achieves 94.6dB SNR and -101.4dB THD (typ).
The MAX11156 guarantees 18-bit no-missing codes and
±2.8 LSB INL (typ).
The MAX11156 communicates using an SPI-compatible
serial interface at 2.5V, 3V, 3.3V, or 5V logic. The serial
interface can be used to daisy-chain multiple ADCs in
parallel for multichannel applications and provides a busy
indicator option for simplified system synchronization and
timing.
The MAX11156 is offered in a 12-pin, 3mm x 3mm,
TDFN package and is specified over the -40°C to +85°C
temperature range.
Applications
● Data Acquisition Systems
● Industrial Control Systems/Process Control
● Medical Instrumentation
● Automatic Test Equipment
Selector Guide and Ordering Information appear at end of
data sheet.
Typical Operating Circuit
10Ω
±5V
MAX9632
4.7nF
AIN+
AIN-
REF
10µF
1µF VDD
(5V)
18-BIT ADC
MAX11156
REF
BUF
AGNDS
1µF OVDD
(2.3V TO 5V)
INTERFACE
AND CONTROL
CONFIGURATION REGISTER
INTERNAL REFERENCE
SCLK
DIN
DOUT
CNVST
HOST
CONTROLLER
REFIO
GND 0.1µF
Benefits and Features
● High DC/AC Accuracy Improves Measurementuality
• 18-Bit Resolution with No Missing Codes
• 500ksps Throughput Rate Without Pipeline Delay/
Latency
• 94.6dB SNR and -101.4dB THD at 10kHz
• 1.6 LSBRMS Transition Noise
• ±0.5 LSB DNL (typ) and ±2.8 LSB INL (typ)
● Highly Integrated ADC Saves Cost and Space
• 6ppm/°C (typ) Internal Reference
• Internal Reference Buffer
• ±5V Bipolar Analog Input Range
● Wide Supply Range and Low Power Simplify
Power-Supply Design
• 5V Analog Supply
• 2.3V to 5V Digital Supply
• 25.8mW Power Consumption at 500ksps
• 10µA in Shutdown Mode
● Multi-Industry Standard Serial Interface and
Small Package Reduce Size
• SPI/QSPI™/MICROWIRE®/DSP-Compatible Serial
Interface
• 3mm x 3mm Tiny 12-Pin TDFN Package
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corporation.
14-Bit to 18-Bit SAR ADC Family
14-BIT
16-BIT
500ksps 250ksps
16-BIT
500ksps
18-BIT
500ksps
±5V Input
Internal
Reference
0 to 5V Input
Internal
Reference
—
—
MAX11167 MAX11166 MAX11156
MAX11169 MAX11168 MAX11158
MAX11161 MAX11160 MAX11150
MAX11165 MAX11164 MAX11154
0 to 5V Input
External MAX11262 MAX11163 MAX11162 MAX11152
Reference
19-6622; Rev 2; 10/15
