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AD7927:  8-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 20-Lead TSSOP

Product Details


The AD7927 is a 12-bit, high speed, low power, 8-channel, successive approximation ADC. The part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 200 kSPS. The part contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 8 MHz.

The conversion process and data acquisition are controlled         using CS and the serial clock signal, allowing the device to easily 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 AD7927 uses advanced design techniques to achieve very low power dissipation at maximum throughput rates. At maximum throughput rates, the AD7927 consumes 1.2 mA maximum with 3 V supplies; with 5 V supplies, the current consumption is 1.5 mA maximum.

Through the configuration of the control register, the analog input range for the part can be selected as 0 V to REFIN or 0 V to 2 × REFIN, with either straight binary or twos complement output coding. The AD7927 features eight single-ended analog inputs with a channel sequencer to allow a preprogrammed selection of channels to be converted sequentially.

The conversion time for the AD7927 is determined by the SCLK frequency, as this is also used as the master clock to control the conversion. The conversion time may be as short as 800 ns with a 20 MHz SCLK.

Product Highlights

  • High Throughput with Low Power Consumption. The AD7927 offers up to 200 kSPS throughput rates. At the maximum throughput rate with 3 V supplies, the AD7927 dissipates 3.6 mW of power maximum.
  • Eight Single-Ended Inputs with a Channel Sequencer. A consecutive sequence of channels can be selected on which the ADC cycles and converts.
  • Single-Supply Operation with VDRIVE Function. The AD7927 operates from a single 2.7 V to 5.25 V supply. The VDRIVE function allows the serial interface to connect directly to either 3 V or 5 V processor systems independent of AVDD.
  • Flexible Power/Serial Clock Speed Management. The conversion rate is determined by the serial clock, allowing the conversion time to be reduced through the serial clock speed increase. The part also features various shutdown modes to maximize power efficiency at lower throughput rates. Current consumption is 0.5 μA maxi-mum when in full shutdown.
  • No Pipeline Delay. The part features a standard successive approximation ADC with a CS input pin, which allows for accurate control of each sampling instant.

FEATURES and BENEFITS

  • Fast throughput rate: 200 kSPS
  • Specified for AVDD of 2.7V to 5.25V
  • Low power
    3.6 mW maximum at 200 kSPS with 3 V supply
    7.5 mW maximum at 200 kSPS with 5 V supply
  • 8 (single-ended) inputs with sequencer
  • Flexible power/serial clock speed management
  • Wide input bandwidth
    70 dB minimum SINAD at 50 kHz input frequency
  • No pipeline delays
  • High speed serial interface SPI™-, QSPI™-, MICROWIRE™-, DSP-compatible
  • Shutdown mode: 0.5 μA maximum
  • 20-lead TSSOP
  • Qualified for Automotive

AD7927 Functional Block Diagram

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Documentation

Title Content Type File Type
AD7927: 8-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 20-Lead TSSOP Data Sheet (Rev D, 06/2013) (pdf, 1418 kB) Data Sheets PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
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RAQs index Rarely Asked Questions HTML
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Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

AD7927 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7927BRU Status: Production 20 ld TSSOP 20 Ind Tube, 75 $3.84 $3.28 N  Material Info PCN Purchase
AD7927BRU-REEL Status: Contact ADI 20 ld TSSOP 20 Ind Reel, 2500 - - N  Material Info PCN/PDN Contact ADI
AD7927BRUZ Status: Production 20 ld TSSOP 20 Ind Tube, 75 $3.33 $2.83 Y  Material Info PCN Purchase Sample
AD7927BRUZ-REEL Status: Production 20 ld TSSOP 20 Ind Reel, 2500 - $2.83 Y  Material Info PCN Purchase
AD7927BRUZ-REEL7 Status: Production 20 ld TSSOP 20 Ind Reel, 1000 - $2.83 Y  Material Info PCN Purchase
AD7927WYRUZ-REEL7 Status: Production TSSOP 4.4 MM 20 Ind Reel, 1000 - $3.02 Y  Material Info PCN Purchase Sample
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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