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AD7864:  High Speed, Low Power, 4-channel Simultaneous Sampling, 12-Bit ADC

Product Details


The AD7864 is a high speed, low power, 4-channel, simulta-neous sampling 12-bit analog-to-digital converter (ADC) that operates from a single 5 V supply. The part contains a 1.65 μs successive approximation ADC, four track-and-hold amplifiers, a 2.5 V reference, an on-chip clock oscillator, signal conditioning circuitry, and a high speed parallel interface. The input signals on four channels sample simultaneously preserving the relative phase information of the signals on the four analog inputs. The part accepts analog input ranges of ±10 V, ±5 V (AD7864-1), 0 V to +2.5 V, 0 V to +5 V (AD7864-2), and ±2.5 V (AD7864-3).

Any subset of the four channels can be converted to maximize the throughput rate on the selected sequence. Select the channels to convert via hardware (channel select input pins) or software (programming the channel select register).

A single conversion start signal (CONVST) simultaneously places all the track-and-holds into hold and initiates a conversion sequence for the selected channels. The EOC signal indicates the end of each individual conversion in the selected conversion sequence. The BUSY signal indicates the end of the conversion sequence.

Data is read from the part by a 12-bit parallel data bus using the standard CS and RD signals. Maximum throughput for a single channel is 500 kSPS. For all four channels, the maximum throughput is 130 kSPS for the read-during-conversion sequence operation. The throughput rate for the read-after-conversion sequence operation depends on the read cycle time of the processor. See the Timing and Control section. The AD7864 is available in a small (0.3 square inch area) 44-lead MQFP.

FEATURES and BENEFITS

  • High speed (1.65 μs) 12-bit ADC
  • 4 simultaneously sampled inputs
  • 4 track-and-hold amplifiers
    0.35 μs track-and-hold acquisition time
    1.65 μs conversion time per channel
  • HW/SW select of channel sequence for conversion
  • Single-supply operation
  • Selection of input ranges
    ±10 V, ±5 V for AD7864-1
    ±2.5 V for AD7864-3 0 V to 2.5 V, 0 V to 5 V for AD7864-2
  • High speed parallel interface that allows
    Interfacing to 3 V processors
  • See data sheet for additional features

AD7864 Functional Block Diagram

Documentation

Title Content Type File Type
AD7864: 4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC Data Sheet (Rev D, 02/2009) (pdf, 413 kB) Data Sheets PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Compensate for Loading Effects on Power Lines with a DSP-Controlled Active Shunt Filter
(Analog Dialogue, Vol. 33, No. 9, October, 1999)
Analog Dialogue HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

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

AD7864 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7864ASZ-1 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $16.19 $13.81 Y  Material Info PCN Purchase Sample
AD7864ASZ-1REEL Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Reel, 800 - $13.81 Y  Material Info PCN Purchase
AD7864ASZ-2 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $16.19 $13.81 Y  Material Info PCN Purchase
AD7864ASZ-2REEL Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Reel, 800 - $13.81 Y  Material Info PCN Purchase
AD7864ASZ-3 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $16.19 $13.81 Y  Material Info PCN Purchase
AD7864ASZ-3REEL Status: Last Time Buy 44 ld MQFP (13.90mm wide) 44 Ind Reel, 800 - $13.81 Y  Material Info PCN/PDN Purchase
AD7864BSZ-1 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $21.05 $17.86 Y  Material Info PCN Purchase
AD7864BSZ-1REEL Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Reel, 800 - $17.86 Y  Material Info PCN Purchase
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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