(ACTIVE) 12-Bit 1MSPS Ultra-Low-Power Ultra-Small-Size SAR ADC With SPI Interface


Functional Diagram


The ADS7042 is a 12-bit, 1-MSPS, analog-to-digital converter (ADC). The device supports a wide analog input voltage range (1.65 V to 3.6 V) and includes a capacitor-based, successive-approximation register (SAR) ADC with an inherent sample-and-hold circuit. The SPI-compatible serial interface is controlled by the CS and SCLK signals. The input signal is sampled with the CS falling edge and SCLK is used for conversion and serial data output. The device supports a wide digital supply range (1.65 V to 3.6 V), enabling direct interface to a variety of host controllers. The ADS7042 complies with the JESD8-7A standard for normal DVDD range (1.65 V to 1.95 V).

The ADS7042 is available in 8-pin, miniature, leaded, and X2QFN packages and is specified for operation from –40°C to 125°C. Miniature form-factor and extremely low-power consumption make this device suitable for space-constrained, battery-powered applications.


  • Industry’s First SAR ADC with Nanowatt Power Consumption:
    • 234 µW at 1 MSPS with 1.8-V AVDD
    • 690 µW at 1 MSPS with 3-V AVDD
    • 69 µW at 100 kSPS with 3-V AVDD
    • Less than 1 µW at 1 kSPS with 3-V AVDD
  • Industry’s Smallest SAR ADC:
    • X2QFN-8 Package with 2.25-mm2 Footprint
  • 1-MSPS Throughput with Zero Data Latency
  • Wide Operating Range:
    • AVDD: 1.65 V to 3.6 V
    • DVDD: 1.65 V to 3.6 V (Independent of AVDD)
    • Temperature Range: –40°C to 125°C
  • Excellent Performance:
    • 12-Bit Resolution with NMC
    • ±1-LSB (Max) DNL and INL
    • 70-dB SNR with 3-V AVDD
    • –80-dB THD with 3-V AVDD
  • Unipolar Input Range: 0 V to AVDD
  • Integrated Offset Calibration
  • SPI™-Compatible Serial Interface: 16 MHz
  • JESD8-7A Compliant Digital I/O


Resolution (Bits) 12    
Sample Rate (Max) (kSPS) 1000    
Number of input channels 1    
Interface SPI    
Operating Temperature Range (C) -40 to 125    
Package Group VSSOP|8^X2QFN|8    
Approx. Price (US$) 0.99 | 1ku    
Power Consumption (Typ) (mW) 0.234    
Package Size: mm2:W x L (PKG) 8VSSOP: 6 mm2: 3.1 x 2 (VSSOP|8)^8X2QFN: 2 mm2: 1.5 x 1.5 (X2QFN|8)    
Architecture SAR    
Input Type Single-Ended    
Multi-Channel Configuration N/A    
Reference Mode Supply    
Features Small Size    
Input Range (Max) (V) 3.6    
Input Range (Min) (V) 0    
Analog Voltage AVDD (Min) (V) 1.65    
Analog Voltage AVDD (Max) (V) 3.6    
Digital Supply (Min) (V) 1.65    
Digital Supply (Max) (V) 3.6    
INL (Max) (+/-LSB) 1    
SINAD (dB) 69.5    
SNR (dB) 70    
THD (Typ) (dB) -80    
Rating Catalog    
Sample Rate (Max) (MSPS) 1    

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