MAX11156 Datasheet, PDF (1/27 Pages) Maxim Integrated Products – 18-Bit, 500ksps, ±5V SAR ADC with Internal Reference in TDFN

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 excel-
lent AC and DC performance with true bipolar input range,
small size, and internal reference. The MAX11156 mea-
sures a ±5V (10V_P-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 6ppm/°C reference with
internal buffer, saving the cost and space of an external
reference.
The MAX11156 produces 94.6dB SNR and -105dB THD
(typ). The MAX11156 guarantees 18-bit no-missing codes.
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 tem-
perature 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
Features
● High DC and AC Accuracy
● 18-Bit Resolution with No Missing Codes
● SNR: 94.6dB
● THD: -105dB at 10kHz
● ±2.5 LSB INL (typ)
● ±0.4 LSB DNL (typ)
● Internal Reference and Reference Buffer Save Cost
and Board Space
● 6ppm/°C (typ)
● Tiny 12-Pin 3mm x 3mm TDFN Package
● Bipolar ±5V Analog Input Range Saves External
Signal Conditioning
● Single-Supply ADC with Low Power
● 5V Analog Supply
● 2.3V to 5V Digital Supply
● 26.5mW at 500ksps
● Shutdown Mode
● 500ksps Throughput Rate
● No Pipeline Delay/Latency
● Flexible Industry-Standard Serial Interface Saves I/O
Pins
● SPI/QSPI™/MICROWIRE^®/DSP-Compatible
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corporation.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX11156.related.
50Ω
AIN+
±5V
MAX9632
500pF
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
GND
SCLK
DIN
DOUT
CNVST
REFIO
HOST
CONTROLLER
0.1µF
19-6622; Rev 0; 3/13