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MAX11905 Datasheet, PDF (1/29 Pages) Maxim Integrated Products – 20-Bit, 1.6Msps, Low-Power, Fully Differential | |||
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MAX11905
EVALUATION KIT AVAILABLE
20-Bit, 1.6Msps, Low-Power, Fully Differential
SAR ADC
General Description
The MAX11905 is a 20-bit, 1.6Msps, single-channel, fully
differential SAR ADC with internal reference buffers. The
MAX11905 provides excellent static and dynamic perfor-
mance with best-in-class power consumption that directly
scales with throughput. The device has a unipolar differ-
ential ±VREF input range. Supplies include a 3.3V supply
for the reference buffers, a 1.8V analog supply, a 1.8V
digital supply, and a 1.5V to 3.6V digital interface supply.
This ADC achieves 98.3dB SNR and -123dB THD, guar-
antees 20-bit resolution with no-missing codes and 6 LSB
INL (max).
The MAX11905 communicates data using a SPI-
compatible serial interface. The MAX11905 is offered in a
20-pin, 4mm x 4mm, TQFN package and is specified over
the -40°C to +85°C operating temperature range.
Applications
ââ Test and Measurement
ââ Automatic Test Equipment
ââ Medical Instrumentation
ââ Process Control and Industrial Automation
ââ Data Acquisition Systems
ââ Telecommunications
ââ Battery-Powered Equipment
Benefits and Features
ââ High DC/AC Accuracy Provides Better Measurement
Quality
⢠20-Bit Resolution with No Missing Codes
⢠±6 LSB INL and ±1 LSB DNL Maximum at 20 Bits
⢠98.3dB SNR and 98.1dB SINAD at fIN = 10kHz
⢠-123dB THD at fIN = 10kHz
ââ High Sampling Rate SAR Architecture Enables Fast
Settling and Acquisition
⢠1.6Msps Throughput with No Pipeline Delay
ââ Integration Simplifies Design
⢠Integrated Reference Buffers, VREF = 2.5V to 3.6V
⢠±VREF Unipolar Differential Analog Input Range
ââ Scalable Ultra-Low Power Supply Reduces Power
Consumption
⢠9mW at 1.6Msps
ââ Flexible Low-Voltage Supplies Save Cost
⢠1.8V Analog and Digital Core Supply
⢠1.5V to 3.6V Digital Interface Supply
⢠3.3V REFVDD Reference Buffer Supply
ââ Flexible, Industry-Standard Serial Interface and Small
Package Reduce Size
⢠SPI-/QSPIâ¢-/MICROWIRE®/DSP-Compatible
⢠20-Pin, 4mm x 4mm, TQFN Package
Application Diagram
0 TO 3.3V
3.3V TO 0V
7.5â¦
1nF
COG
7.5â¦
1.5 TO
3.3V
3.6V 1.8V 1.8V 3.6V
REFVDD AVDD DVDD OVDD
REFIN
AIN+
DIN
MAX11905
SCLK
DOUT
AIN-
CNVST
REF REFGND AGND DGND
3.3V
10µF
4-WIRE
SPI
INTERFACE
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corporation.
Ordering Information and Selector Guide appears at end of
data sheet.
16-Bit to 20-Bit SAR ADC Family
1.6Msps
1Msps
16-BIT
MAX11901
MAX11900
18-BIT
MAX11903
MAX11902
20-BIT
MAX11905
MAX11904
19-6860; Rev 3; 6/16
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