ADS7924 12-Bit 4-Ch MUX-Input SAR ADC With Intelligent System Power Control | TI.com

ADS7924 (ACTIVE)

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

 

Description

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.

Features

  • 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) (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)
SINAD (dB)
SNR (dB)
THD (Typ) (dB)
Rating
ADS7924 ADS7056 ADS7142 ADS7950
12     14     12
16    
12    
100     2500     140     1000    
4     1     2     4    
I2C     SPI     I2C     SPI    
-40 to 85     -40 to 125     -40 to 125     -40 to 125    
WQFN | 16     X2QFN | 8     X2QFN | 10     TSSOP | 30
VQFN | 24    
1.25 | 1ku     2.00 | 1ku     0.85 | 1ku     2.30 | 1ku    
0.5     3.5     0.0009     11.5    
16WQFN: 9 mm2: 3 x 3 (WQFN | 16)     8X2QFN: 2 mm2: 1.5 x 1.5 (X2QFN | 8)     10X2QFN: 3 mm2: 2 x 1.5 (X2QFN | 10)     30TSSOP: 50 mm2: 6.4 x 7.8 (TSSOP | 30)
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)    
SAR     SAR     SAR     SAR    
Single-Ended     Single-Ended     Pseudo-Differential
Single-Ended    
Single-Ended    
Multiplexed    
   
Multiplexed     Multiplexed    
Supply     Supply     Supply     Ext    
Oscillator
Small Size    
Small Size     Comparator
Oscillator
Small Size    
   
5.5     3.6     3.6     5.25    
0     0     0     0    
2.2     2.35     1.65     2.7    
5.5     3.6     3.6     5.25    
1.65     1.65     1.65     1.7    
5.5     3.6     3.6     5.25    
1.5     3     1     1    
  74.5     71     71.3    
  74.9     71.5     71.7    
  -85     -80     -82    
Catalog     Catalog     Catalog     Catalog