Datasheet AD7819 (Analog Devices)

a
2.7 V to 5.5 V, 200 kSPS 8-Bit Sampling ADC AD7819 FEATURES FUNCTIONAL BLOCK DIAGRAM 8-Bit ADC with 4.5 s Conversion Time V On-Chip Track and Hold DD AGND VREF Operating Supply Range: 2.7 V to 5.5 V Specifications at 2.7 V – 3.6 V and 5 V 10% AD7819 DB7 CHARGE 8-Bit Parallel Interface REDISTRIBUTION THREE- 8-Bit Read DAC STATE DRIVERS Power Performance CLOCK DB0 Normal Operation OSC 10.5 mW, VDD = 3 V Automatic Power-Down CONTROL COMP T/H LOGIC V 57.75 W @ 1 kSPS, V IN DD = 3 V Analog Input Range: 0 V to VREF Reference Input Range: 1.2 V to VDD BUSY CS RD CONVST GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD7819 is a high speed, microprocessor-compatible, 8-bit 1. Low Power, Single Supply Operation analog-to-digital converter with a maximum throughput of The AD7819 operates from a single 2.7 V to 5.5 V supply 200 kSPS. The converter operates off a single 2.7 V to 5.5 V and typically consumes only 10.5 mW of power. The power supply and contains a 4.5 µs successive approximation A/D dissipation can be significantly reduced at lower through- converter, track/hold circuitry, on-chip clock oscillator and 8-bit put rates by using the automatic power-down mode. wide parallel interface. The parallel interface is designed to 2. Automatic Power-Down allow easy interfacing to microprocessors and DSPs. Using only The automatic power-down mode, whereby the AD7819 address decoding logic the AD7819 is easily mapped into the goes into power-down mode at the end of a conversion and microprocessor address space. powers up before the next conversion, means the AD7819 When used in its power-down mode, the AD7819 automatically is ideal for battery powered applications; e.g., 57.75 µW powers down at the end of a conversion and powers up at the @ 1 kSPS. (See Power vs. Throughput Rate section.) start of a new conversion. This feature significantly reduces the 3. Parallel Interface power consumption of the part at lower throughput rates. The An easy to use 8-bit wide parallel interface allows interfacing AD7819 can also operate in a high speed mode where the part is to most popular microprocessors and DSPs with minimal not powered down between conversions. In this mode of opera- external circuitry. tion the part is capable of providing 200 kSPS throughput. 4. Dynamic Specifications for DSP Users The part is available in a small, 16-lead 0.3" wide, plastic dual- In addition to the traditional ADC specifications, the AD7819 in-line package (DIP); in a 16-lead, 0.15" wide, narrow body is specified for ac parameters, including signal-to-noise ratio small outline IC (SOIC) and in a 16-lead, narrow body, thin and distortion. shrink small outline package (TSSOP). REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
which may result from its use. No license is granted by implication or
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
otherwise under any patent or patent rights of Analog Devices.
Fax: 781/326-8703 © Analog Devices, Inc., 2000