1 Features

? Programmable data rate:

– Up to 400 kSPS (wideband filter)

– Up to 1.067 MSPS (low-latency filter)

? Selectable digital filter:

– Wideband or low-latency

? AC accuracy with dc precision:

– Dynamic range: 111.5 dB (200 kSPS)

– THD: –120 dB

– INL: 0.9 ppm of FS

– Offset drift: 50 nV/°C

– Gain drift: 0.6 ppm/°C

? Power-scalable architecture:

– High-speed mode: 400 kSPS, 18.6 mW

– Low-speed mode: 50 kSPS, 3.3 mW

? Input and reference precharge buffers

? Internal or external clock

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

2 Applications

? Test and measurement:

– Data acquisition (DAQ)

– Shock and vibration instruments

– Acoustics and dynamic strain gauges

? Factory automation and control:

– Condition monitoring

? Aerospace and defense:

– SONAR

? Medical:

– Electroencephalogram (EEG)

? Grid Infrastructure:

– Power quality analyzer

3 Description

The ADS127L11 is a 24-bit, delta-sigma (ΔΣ), analogto-

digital converter (ADC) with data rates up to

400 kSPS using the wideband filter and up to

1067 kSPS using the low-latency filter. The device

offers an excellent combination of ac performance

and dc precision with low power consumption

(18.6 mW in high-speed mode).

The device integrates input and reference buffers

to reduce signal loading. The low-drift modulator

achieves excellent dc precision with low in-band noise

for outstanding ac performance. The power-scalable

architecture provides two speed modes to optimize

data rate, resolution, and power consumption.

The digital filter is configurable for wideband or lowlatency

operation, allowing wideband ac performance

or data throughput for dc signals to be optimized, all in

one device.

The serial interface features daisy-chain capability to

reduce the SPI I/O over an isolation barrier. Input and

output data and register settings are validated by a

cyclic-redundancy check (CRC) feature to enhance

operational reliability.

The small 3-mm × 3-mm WQFN and 6.5-mm × 4.4-

mm TSSOP packages are designed for limited space

applications. The device is fully specified for operation

over the –40°C to +125°C temperature range.