ADS1626 18 Bit, 1.25MSPS Single Channel Delta-Sigma ADC Single with an adjustable FIFO |

ADS1626 (ACTIVE) 18 Bit, 1.25MSPS Single Channel Delta-Sigma ADC Single with an adjustable FIFO

18 Bit, 1.25MSPS Single Channel Delta-Sigma ADC Single with an adjustable FIFO - ADS1626


The ADS1625 and ADS1626 are high-speed, high-precision, delta-sigma analog-to-digital converters (ADCs) with 18-bit resolution. The data rate is 1.25 mega samples per second (MSPS), the bandwidth (-3dB) is 615kHz, and passband ripple is less than ±0.0025dB (to 550kHz). Both devices offer the same outstanding performance at these speeds with a signal-to-noise ratio up to 93dB, total harmonic distortion down to -101dB, and a spurious-free dynamic range up to 103dB. The ADS1626 includes an adjustable first-in, first-out buffer (FIFO) for the output data.

The input signal is measured against a voltage reference that can be generated on-chip or supplied externally. The digital output data is provided over a simple parallel interface that easily connects to digital signal processors (DSPs). An out-of-range monitor reports when the input range has been exceeded. The ADS1625/6 operate from a +5V analog supply (AVDD) and +3V digital supply (DVDD). The digital I/O supply (IOVDD) operates from +2.7 to +5.25V, enabling the digital interface to support a range of logic families. The analog power dissipation is set by an external resistor and can be reduced when operating at slower speeds. A power-down mode, activated by a digital I/O pin, shuts down all circuitry. The ADS1625/6 are offered in a TQFP-64 package using TI PowerPAD™ technology.

The ADS1625 and ADS1626, along with their 16-bit, 5MSPS counterparts, the ADS1605 and ADS1606, are well-suited for the demanding measurement requirements of scientific instrumentation, automated test equipment, data acquisition, and medical imaging.


  • Data Rate: 1.25MSPS
  • Signal-to-Noise Ratio: 93dB
  • Total Harmonic Distortion: –101dB
  • Spurious-Free Dynamic Range: 103dB
  • Linear Phase with 615kHz Bandwidth
  • Passband Ripple: ±0.0025dB
  • Adjustable FIFO Output Buffer (ADS1626 only)
  • Selectable On-Chip Reference
  • Directly Connects to TMS320C6000 DSPs
  • Adjustable Power Dissipation: 150 to 515mW
  • Power Down Mode
  • Supplies:
       Analog         +5V
       Digital          +3V
       Digital I/O    +2.7 to +5.25V
    • Scientific Instruments
    • Automated Test Equipment
    • Data Acquisition
    • Medical Imaging
    • Vibration Analysis

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

WEBENCH® Designer ADS1626


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Part number Order Resolution (Bits) Sample rate (Max) (kSPS) Number of input channels Interface Operating temperature range (C) Package Group Approx. price (US$) Power consumption (Typ) (mW) Package size: mm2:W x L (PKG) Architecture Input type Multi-channel configuration Reference mode Features 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) SNR (dB) THD (Typ) (dB) Rating
ADS1626 Order now 18     1250     1     Parallel     -40 to 105     HTQFP | 64     15.53 | 1ku     520     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     Delta-Sigma     Differential         Ext
    4.8     0     4.75     5.25     2.7     5.25     3.5     93     -101     Catalog