The MAX11270 is a 24-bit delta-sigma ADC that achieves excellent 130dB SNR while dissipating an ultra-low 10mW. Sample rates up to 64ksps allow both precision DC and AC measurements. Integral nonlinearity is guaranteed to 4ppm maximum. The THD is -122dB. The MAX11270 communicates via an SPI-compatible serial interface and is available in a small 24-pin TSSOP package.

The MAX11270 offers a 6.5nV/

noise programmable gain amplifier with gain settings between 1x to 128x. Optional buffers are also included to provide isolation of the signal inputs from the switched capacitor sampling network. This allows the MAX11270 to be used with high-impedance sources without compromising available dynamic range.

The MAX11270 operates from a single 2.7V to 3.6V analog supply, or split ±1.8V analog supplies, allowing the analog input to be sampled below ground. The digital supply range is 2.0V to 3.6V, allowing communication with 2.5V, 3V, or 3.3V logic.

MAX11270: Typical Application Circuit

Enlarge+

Key Features

High Resolution for Instrumentation Applications that Require a Wide Dynamic Range
- 130dB SNR at 1.9sps
- 112dB SNR at 1000sps
- 20.4-Bit Noise-Free Resolution at 1.9sps
- 17.4-Bit Noise-Free Resolution at 1000sps
Longer Battery Life for Portable Applications
- 2.4mA Operating Mode Current
- 4.4mA PGA Low-Noise Mode Current
- 1µA Sleep Current
High Accuracy for DC Measurements
- 1ppm INL (typ), 4ppm (max)
Single or Split Analog Supplies Provide Input Voltage Range Flexibility
- 2.7V to 3.6V (Single Supply) or ±1.8V (Split Supplies)
Flexible High-Performance Filter Architecture Simplifies Design
- Programmable SINC Filter
Enables System Integration
- Low-Noise PGA with Gains of 1, 2, 4, 8, 16, 32, 64, 128
- Signal Buffer Optional
- 3 General-Purpose I/Os
Enables Integrated Part and System Calibration for Gain and Offset
Robust 24-Pin TSSOP Packaging

Applications/Uses

ATE
High-Precision Portable Sensors
Medical Equipment
Scientific Instrumentation

Key Specs

Part Number

Resolution
(bits)

Input Chan.

Conv. Rate
(ksps)

ADC Architecture

Data Bus

Diff/S.E. Input

External V_REF
(V)

Unipolar V_IN
(V)

Bipolar V_IN
(±V)

Package/Pins

Budgetary
Price

ADC

max

min

max

See Notes

MAX11270

Sigma-Delta

SPI

Both

3.6

1.8

TSSOP/24

$6.00 @1k

See All Precision ADCs (< 5Msps) (471)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

MAX11270EVKIT: Evaluation Kit for the MAX11270

Quality and Environmental Data

Product Reliability Reports: MAX11270.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

MAX11270 IBIS Model

Software
MAX11270 EV Kit

Order

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