1 Features

1• Data Rates: Up to 512 kSPS

• AC + DC Performance:

– Passband: Up to 230 kHz

– SNR: Up to 115.5 dB

– THD: Down to -129 dB

– DC Accuracy:

– Offset Drift: 1.5 μV/°C

– Gain Drift: 0.2 ppm/°C

• Operating Modes:

– High-resolution (128 kSPS at 26 mW)

– Low-power (128 kSPS at 15 mW)

– Very-low Power: 105 dB SNR (128 kSPS at 9

mW)

• Digital Filter Options:

– Low-latency Filter: Sinc Frequency Response

– Wideband 1 Filter:

(0.45 to 0.55) × fDATA Transition Band

– Wideband 2 Filter:

(0.40 to 0.50) × fDATA Transition Band

• SPI™ or Frame-Sync Serial Interface

– Daisy-Chain Compatible

• Analog Supply: 2.7 V to 3.6 V

• Digital Supply: 1.7 V to 3.6 V

• Operating Temperature: –40°C to +125°C

2 Applications

• Vibration and Modal Analysis

• Data Acquisition Systems

• Acoustics and Dynamic Strain Gauges

• Power Quality Analysis

3 Description

The ADS127L01 is a 24-bit, delta-sigma (ΔΣ), analogto-

digital converter (ADC) with data rates up to 512

kSPS. This device offers a unique combination of

excellent dc accuracy and outstanding ac

performance. The high-order, chopper-stabilized

modulator achieves very low drift with low in-band

noise. The integrated decimation filter suppresses

modulator out-of-band noise. In addition to al lowlatency

filter, the ADS127L01 provides multiple

Wideband filters with less than ±0.00004 dB of ripple,

and an option for –116-dB stop-band attenuation at

the Nyquist rate.

Traditionally, industrial delta-sigma ADCs that offer

good drift performance use digital filters with large

passband droop. As a result, industrial delta-sigma

ADCs have limited signal bandwidth and are mostly

suited for dc measurements. High-resolution ADCs in

audio applications offer larger usable bandwidths, but

the offset and drift specifications are significantly

weaker than industrial counterparts. The ADS127L01

combines these converters, providing high-precision

industrial measurement with excellent dc and ac

specifications over an extended industrial

temperature range of –40°C to +125°C.

A variety of operating modes allow for optimization of

speed, resolution, and power. A programmable serial

interface with one of three options (SPI, frame-sync

slave, or frame-sync master) provides convenient

interfacing across isolation barriers to

microcontrollers or digital signal processors (DSPs).