ADS127L21
24-bit, 512-kSPS wide-bandwidth delta-sigma ADC with programmable IIR and FIR filters
ADS127L21
- Programmable FIR filter
- Programmable IIR filter
- Wideband or low-latency filter modes
- Programmable data rates:
- Wideband filter: 512kSPS
- Low-latency filter: 1.365MSPS
- Conversion latency (low-latency filter): 3µs
- AC accuracy with dc precision:
- Dynamic range (200kSPS): 111.5dB (typical)
- THD: –125dB (typical)
- INL: 0.4ppm of FS (typical)
- Offset drift: 50nV/°C (typical)
- Gain drift: 0.5ppm/°C (typical)
- Power-scalable speed ranges:
- Max speed: 512kSPS, 33mW (typical)
- High speed: 400kSPS, 26mW (typical)
- Mid speed: 200kSPS, 14mW (typical)
- Low speed: 50kSPS, 4.3mW (typical)
- Input range: ±VREF or ±2VREF
- Buffered inputs
- Internal or external clock operation
- Functional Safety-Capable
The ADS127L21 is a 24-bit, delta-sigma (ΔΣ), analog-to-digital converter (ADC) featuring a programmable digital filter. This digital filter has data rates up to 512kSPS using the wideband filter and up to 1365kSPS using the low-latency filter. The device offers an excellent combination of ac performance and dc precision with low power consumption.
Programmable infinite and finite impulse response (IIR and FIR) digital filters allow custom filter profiles, such as A-weighting compensation and frequency notch filters. The wideband or low-latency filter option optimize ac-signal performance or data throughput of dc signals, all in one device.
The low-drift modulator achieves excellent dc precision with low wideband noise for outstanding ac performance. The power-scalable architecture features four speed modes to optimize data rate, resolution, and power consumption. Signal and reference input buffers reduce driver loading for increased accuracy.
The serial interface features daisy-chain capability to reduce the number of signal lines over an isolation barrier. SPI input data and register memory contents are validated by cyclic-redundancy check (CRC) to enhance operational reliability.
The small 3mm × 3mm WQFN package is designed for space-limited applications. The device is fully specified for operation over the –40°C to +125°C temperature range.
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Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | ADS127L21 512kSPS, Programmable Filter, 24-Bit, Wideband Delta-Sigma ADC datasheet (Rev. B) | PDF | HTML | 16 Apr 2024 |
Functional safety information | ADS1x7Lx1x Functional Safety FIT Rate, FMD and Pin FMA (Rev. C) | PDF | HTML | 26 Sep 2024 | |
Application note | Achieve High SNR with the PGA855, Fully Differential Programmable-Gain Amplifier | PDF | HTML | 21 Mar 2024 | |
Application brief | Benefits of Integrated FIR and IIR Filters in Delta-Sigma ADCs | PDF | HTML | 11 May 2023 | |
Application note | Four Channel Analog to Digital Interface with Sitara AM243x MCU+ | PDF | HTML | 20 Apr 2023 | |
Application note | Digital Filter Types in Delta-Sigma ADCs (Rev. A) | PDF | HTML | 29 Mar 2023 | |
EVM User's guide | ADS127L21EVM-PDK Evaluation Module | PDF | HTML | 08 Feb 2023 | |
Certificate | ADS127L21EVM-PDK EU RoHS Declaration of Conformity (DoC) | 24 Jan 2023 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
ADS127L21EVM-PDK — ADS127L21 evaluation module for ADC with easy-to-drive inputs and wideband or low-latency filters
ADC-DESIGN-CALC — Online design calculator tool for TI Precision ADCs
Supported products & hardware
Products
Precision ADCs
Isolated ADCs
ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
Supported products & hardware
Products
Precision op amps (Vos<1mV)
General-purpose op amps
Audio op amps
Transimpedance amplifiers
High-speed op amps (GBW ≥ 50 MHz)
Power op amps
Video amplifiers
Line drivers
Transconductance amplifiers & laser drivers
Fully differential amplifiers
Precision ADCs
Biosensing AFEs
High-speed ADCs (≥10 MSPS)
Receivers
Touchscreen controllers
Difference amplifiers
Instrumentation amplifiers
Audio line receivers
Analog current-sense amplifiers
Digital power monitors
Analog current-sense amplifiers with integrated shunt resistor
Digital power monitors with integrated shunt resistor
Die & wafer services
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
TINA-TI — SPICE-based analog simulation program
TIDA-010945 — Precision signal chain for digital multimeters reference design
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
WQFN (RUK) | 20 | Ultra Librarian |
Ordering & quality
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