ADS127L21 Series

24-bit, 512-kSPS wide-bandwidth delta-sigma ADC with programmable IIR and FIR filters

Catalog

24-bit, 512-kSPS wide-bandwidth delta-sigma ADC with programmable IIR and FIR filters

Part	Supplier Device Package	Ratio - S/H:ADC	Architecture	Number of Inputs	Mounting Type	Configuration	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Package / Case	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Features	Number of Bits	Number of A/D Converters	Input Type	Sampling Rate (Per Second)	Reference Type	Data Interface
Texas Instruments ADS127L21IRUKT	20-WQFN (3x3)	0:1	Sigma-Delta	1 2	Surface Mount	ADC	5.5 V	1.65 V	20-WFQFN Exposed Pad	-40 °C	125 °C	2.85 V	5.5 V	Internal Oscillator Programmable Filter	24	1	Differential Single Ended	1.365 M	External	SPI
Texas Instruments ADS127L21IRUKR	20-WQFN (3x3)	0:1	Sigma-Delta	1 2	Surface Mount	ADC	5.5 V	1.65 V	20-WFQFN Exposed Pad	-40 °C	125 °C	2.85 V	5.5 V	Internal Oscillator Programmable Filter	24	1	Differential Single Ended	1.365 M	External	SPI

Catalog

24-bit, 512-kSPS wide-bandwidth delta-sigma ADC with programmable IIR and FIR filters

Key Features

• Programmable FIR filterProgrammable IIR filterWideband or low-latency filter modesProgrammable data rates:Wideband filter: 512kSPSLow-latency filter: 1.365MSPSConversion latency (low-latency filter): 3µsAC 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 ±2VREFBuffered inputsInternal or external clock operationFunctional Safety-CapableDocumentation available to aid functional safety system designProgrammable FIR filterProgrammable IIR filterWideband or low-latency filter modesProgrammable data rates:Wideband filter: 512kSPSLow-latency filter: 1.365MSPSConversion latency (low-latency filter): 3µsAC 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 ±2VREFBuffered inputsInternal or external clock operationFunctional Safety-CapableDocumentation available to aid functional safety system design

Description

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. 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.