12-Bit 4-Ch MUX-Input SAR ADC With Intelligent System Power Control

12-Bit 4-Ch MUX-Input SAR ADC With Intelligent System Power Control - ADS7924


The ADS7924 is a four-channel, 12-bit, analog-to-digital converter (ADC) with an I2C™ interface. With its low-power ADC core, support for low-supply operation, and a flexible measurement sequencer that essentially eliminates power consumption between conversions, the ADS7924 forms a complete monitoring system for power-critical applications such as battery-powered equipment and energy harvesting systems.

The ADS7924 features dedicated data registers and onboard programmable digital threshold comparators for each input. Alarm conditions can be programmed that generate an interrupt. The combination of data buffering, programmable threshold comparisons, and alarm interrupts minimize the host microcontroller time needed to supervise the ADS7924.

The four-channel input multiplexer (MUX) is routed through external pins to allow a common signal conditioning circuit to be used between the MUX and ADC, thereby reducing overall component count. The low-power ADC uses the analog supply as its reference and can acquire and convert signals in only 10 µs. An onboard oscillator eliminates the need to supply a master clock.

The ADS7924 is offered in a small 3-mm × 3-mm WQFN and is fully specified for operation over the industrial temperature range of –40°C to 85°C.


  • Intelligent Monitoring:
    • Auto-Sequencing of 4-Channel Multiplexer
    • Individual Alarm Thresholds for Each Channel
    • Programmable Scan Rate
  • MicroPOWER™ Monitoring:
    • Four-Channel Scanning:
      • Every 1 ms → 25 µW
      • Every 10 ms → 5 µW
      • < 1 µA of Power-Down Current
    • Programmable Interrupt Pin Controls Shutdown/Wakeup of the Microcontroller
    • Auto Power-Down Control
    • PWRCON Pin Allows Shutdown of External Operational Amplifiers
  • Wide Supply Range:
    • Analog Supply: 2.2 V to 5.5 V
    • Digital Supply: 1.65 V to 5.5 V
  • Small Footprint: 3-mm × 3-mm WQFN

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

Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Multi-Channel Configuration
Input Type
Power Consumption (Typ) (mW)
Input Range (Min) (V)
Input Range (Max) (V)
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Operating Temperature Range (C)
THD (Typ) (dB)
SNR (dB)
Reference Mode
ADS7924 ADS7042 ADS7056 ADS7142 ADS7950
12    12    14    12
100000    1000000    2500000    140000    1000000   
4    1    1    2    4   
Multiplexed    N/A    N/A    Multiplexed    Multiplexed   
Single-Ended    Single-Ended    Single-Ended    Pseudo-Differential
0.5    0.234    3.5    0.0009    11.5   
0    0    0    0    0   
5.5    3.6    3.6    3.6    5.25   
I2C    SPI    SPI    I2C    SPI   
Oscillator    N/A    N/A    Comparator
2.2    1.65    2.35    1.65    2.7   
5.5    3.6    3.6    3.6    5.25   
SAR    SAR    SAR    SAR    SAR   
-40 to 85    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
8X2QFN    10X2QFN    24VQFN
N/A    -80    -85    -80    -82   
  70    74.9    71.5    71.7   
Supply    Supply    Supply    Supply    Ext