AD7922 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 12-Bit A/D Converter

The AD7912/AD7922 are 10-bit and 12-bit, high speed, low power, 2-channel, successive-approximation ADCs respectively. The parts operate from a single 2.35 V to 5.25 V power supply and feature through put rates up to 1 MSPS. The parts contain a low-noise, wide bandwidth track/hold amplifier, which can handle input frequencies in excess of 6 MHz.

The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. There are no pipeline delays associated with the part.

The channel to be converted is selected through the DIN pin and the mode of operation is controlled by CS. The serial data stream from the DOUT pin has a channel identifier bit and a mode identifier bit, which provide information about the channel converted and the current mode of operation.

As a result of the Daisy Chain mode of operation, several AD7912/AD7922 can be connected together in Daisy Chain configuration. The Daisy Chain mode allows the user to read the conversion result from the ADCs contained in the chain.

The AD7912/AD7922 use advanced design techniques to achieve very low power dissipation at high throughput rates.

The reference for the part is taken internally from VDD. This allows the widest dynamic input range to the ADC. Thus the analog input range for the part is 0 to VDD. The conversion rate is determined by the SCLK signal.

Features and Benefits
  • Fast Throughput Rate: 1 MSPS
  • Specified for VDD of 2.35 V to 5.25 V
  • Low Power:
    4.8 mW typ at 1 MSPS with 3 V Supplies
    15.5 mW typ at 1 MSPS with 5 V Supplies
  • Wide Input Bandwidth:
    71.4 dB min SNR at 100 kHz Input Frequency
  • Flexible Power/Serial Clock Speed Management
  • No Pipeline Delays
  • High Speed Serial Interface SPI®/QSPI™ /MICROWIRE™ /DSP Compatible
  • Standby Mode: 1 µA max
  • Daisy Chain Mode
  • 8-Lead TSOT Package
  • 8-Lead MSOP Package
Analog to Digital Converters
Software & Systems Requirements
Data Sheets
Documentnote
AD7912/AD7922: 2-Channel, 2.35 V to 5.25 V 1MSPS, 10-/12-Bit ADCs Data Sheet (Rev. 0)PDF 386 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7922ARMZ Production8 ld MSOPOTH 50-40 to 85C6.255.25Y
AD7922ARMZ-REEL Production8 ld MSOPREEL 3000-40 to 85C05.25Y
AD7922ARMZ-REEL7 Production8 ld MSOPREEL 1000-40 to 85C05.25Y
AD7922AUJZ-REEL7 Production8 ld TSOTREEL 3000-40 to 85C05.25Y
Reference Materials
AD7912/AD7922: 2-Channel, 2.35 V to 5.25 V 1MSPS, 10-/12-Bit ADCs Data Sheet (Rev. 0) ad7912
AD7912/AD7922 Evaluation Board Software (zip, 3.60MB) ad7912
MS-2210:高速ADC的电源设计 ad9861