MAX11905：20-Bit, 1.6Msps, Low-Power, Fully Differential SAR ADC

Fastest and Lowest Power 20-Bit SAR ADC

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 performance with best-in-class power consumption that directly scales with throughput. The device has a unipolar differential ±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, guarantees 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.

Key Features

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
High Sampling Rate SAR Architecture Enables Fast Settling and Acquisition
- 1.6Msps Throughput with No Pipeline Delay
Integration Simplifies Design
- Integrated Reference Buffers, VREF = 2.5V to 3.6V
- ±VREF Unipolar Differential Analog Input Range
Scalable Ultra-Low Power Supply Reduces Power Consumption
- 9mW at 1.6Msps
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
Flexible, Industry-Standard Serial Interface and Small Package Reduce Size
- SPI-/QSPI™-/MICROWIRE®/DSP-Compatible
- 20-Pin, 4mm x 4mm, TQFN Package

MAX11905: Functional Diagram

Applications/Uses

Automatic Test Equipment
Battery-Powered Equipment
Data Acquisition Systems
Medical Instrumentation
Process Control and Industrial Automation
Telecommunications
Test and Measurement

DataSheet

title	Download file
MAX11905 Data Sheet	MAX11905.pdf

Parametrics

Part Number	Resolution (bits)	Input Chan.	Conv. Rate (ksps)	ADC Architecture	Data Bus	Diff/S.E. Input	External V_REF (V)	External V_REF (V)	Unipolar V_IN (V)	SNR (dB)	THD (dB)	INL (±LSB)	Package/Pins	Budgetary Price
Part Number	ADC	Input Chan.	max	ADC Architecture	Data Bus	Diff/S.E. Input	min	max	max	SNR (dB)	THD (dB)	INL (±LSB)	Package/Pins	See Notes
MAX11905	20	1	1600	SAR	DSP-Compatible Serial Microwire QSPI SPI	Diff. Only	2.5	3.6	3.6	98.3	-123	6	TQFN/20	$29.90 @1k