ADS1278 八路、144kHz、24 位同步采样 Σ-Δ ADC | 德州仪器

ADS1278 (正在供货)

八路、144kHz、24 位同步采样 Σ-Δ ADC

八路、144kHz、24 位同步采样 Σ-Δ ADC - ADS1278


Based on the single-channel ADS1271, the ADS1274 (quad) and ADS1278 (octal) are 24-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with data rates up to 144k samples per second (SPS), allowing simultaneous sampling of four or eight channels. The devices are offered in identical packages, permitting drop-in expandability.

Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they 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 respective industrial counterparts. The ADS1274 and ADS1278 combine these types of converters, allowing high-precision industrial measurement with excellent dc and ac specifications.

The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. These ADCs provide a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005dB of ripple.

Four operating modes allow for optimization of speed, resolution, and power. All operations are controlled directly by pins; there are no registers to program. The devices are fully specified over the extended industrial range (–40°C to +105°C) and are available in an HTQFP-64 PowerPAD™ package.


  • Simultaneously Measure Four/Eight Channels
  • Up to 144kSPS Data Rate
  • AC Performance:
    70kHz Bandwidth
    111dB SNR (High-Resolution Mode)
    –108dB THD
  • DC Accuracy:
    0.8µV/°C Offset Drift
    1.3ppm/°C Gain Drift
  • Selectable Operating Modes:
    High-Speed: 144kSPS, 106dB SNR
    High-Resolution: 52kSPS, 111dB SNR
    Low-Power: 52kSPS, 31mW/ch
    Low-Speed: 10kSPS, 7mW/ch
  • Linear Phase Digital Filter
  • SPI™ or Frame-Sync Serial Interface
  • Low Sampling Aperture Error
  • Modulator Output Option (digital filter bypass)
  • Analog Supply: 5V
  • Digital Core: 1.8V
  • I/O Supply: 1.8V to 3.3V
    • Vibration/Modal Analysis
    • Multi-Channel Data Acquisition
    • Acoustics/Dynamic Strain Gauges
    • Pressure Sensors

    PowerPAD is a trademark of Texas Instruments, Inc.
    SPI is a trademark of Motorola, Inc.
    All other trademarks are the property of their respective owners.


    参数 与其它产品相比 精密 ADCs (<=10MSPS)

    Resolution (Bits)
    Sample Rate (Max) (kSPS)
    # Input Channels
    Operating Temperature Range (C)
    Package Group
    Approx. Price (US$)
    Power Consumption (Typ) (mW)
    Package Size: mm2:W x L (PKG)
    Input Type
    Multi-Channel Configuration
    Reference Mode
    Input Range (Max) (V)
    Input Range (Min) (V)
    Analog Voltage AVDD (Min) (V)
    Analog Voltage AVDD (Max) (V)
    Digital Supply (Min) (V)
    Digital Supply (Max) (V)
    INL (Max) (+/-LSB)
    SINAD (dB)
    SNR (dB)
    THD (Typ) (dB)
    Sample Rate (Max) (MSPS)
    ADS1278 ADS1174 ADS1178 ADS1271 ADS1274 ADS127L01
    24     16     16     24     24     24    
    144     52     52     105     144     512    
    8     4     8     1     4     1    
    SPI     SPI     SPI     SPI     SPI     SPI    
    -40 to 105     -40 to 85     -40 to 85     -40 to 105     -40 to 125     -40 to 125    
    HTQFP     HTQFP     HTQFP     TSSOP     HTQFP     TQFP    
    25.15 | 1ku     6.30 | 1ku     8.80 | 1ku     6.31 | 1ku     14.65 | 1ku     6.95 | 1ku    
    530     135     245     92     275     7    
    64HTQFP: 144 mm2: 12 x 12(HTQFP)     64HTQFP: 144 mm2: 12 x 12(HTQFP)     64HTQFP: 144 mm2: 12 x 12(HTQFP)     16TSSOP: 32 mm2: 6.4 x 5(TSSOP)     64HTQFP: 144 mm2: 12 x 12(HTQFP)     32TQFP: 49 mm2: 7 x 7(TQFP)    
    Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
    Differential     Differential
    Differential     Differential     Differential    
    Simultaneous Sampling     Simultaneous Sampling     Simultaneous Sampling     N/A     Simultaneous Sampling     N/A    
    Ext     Ext     Ext     Ext     Ext     Ext    
    Daisy-Chainable     Daisy-Chainable     Daisy-Chainable     Daisy-Chainable     Daisy-Chainable     Daisy-Chainable    
    5.25     5.25     5.25     5.25     5.25     3    
    0     0     0     0     0     0    
    4.75     4.75     4.75     4.75     4.75     2.7    
    5.25     5.25     5.25     5.25     5.25     3.6    
    1.65     1.65     1.65     1.65     1.65     1.7    
    2.2     1.95     1.95     3.6     2.2     3.6    
    201.4     0.0045     1     251.7     201.4