24-Bit, 512kSPS, Delta-Sigma ADC - ADS127L01

ADS127L01 (ACTIVE)

24-Bit, 512kSPS, Delta-Sigma ADC

 

Description

The ADS127L01 is a 24-bit, delta-sigma (ΔΣ), analog-to-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 low-latency 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).

Features

  • 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

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Parametrics Compare all products in Precision ADCs (<=10MSPS)

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Type
Power Consumption (Typ) (mW)
Input Range (Min) (V)
Input Range (Max) (V)
Interface
Integrated Features
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Architecture
Operating Temperature Range (C)
Pin/Package
THD (Typ) (dB)
SNR (dB)
Reference Mode
ADS127L01 ADS1271 ADS1274 ADS1278
24    24    24    24   
512kSPS    105kSPS    144kSPS    144kSPS   
1    1    4    8   
Differential    Differential    Differential    Differential   
7    92    275    530   
0    0    0    0   
3    5.25    5.25    5.25   
SPI    SPI    SPI    SPI   
Daisy-Chainable    Daisy-Chainable    Daisy-Chainable    Daisy-Chainable   
2.7    4.75    4.75    4.75   
3.6    5.25    5.25    5.25   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 125    -40 to 105    -40 to 125    -40 to 105   
32TQFP    16TSSOP    64HTQFP    64HTQFP   
-126    -105    -108    -108   
115.5    109    111    111   
Ext    Ext    Ext    Ext   

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