Datasheet AD7899 (Analog Devices)

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5 V Single Supply 14-Bit 400 kSPS ADC AD7899 FEATURES FUNCTIONAL BLOCK DIAGRAM Fast (2.2
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s) 14-Bit ADC AVDD VREF VDRIVE 400 kSPS Throughput Rate 0.3
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s Track/Hold Acquisition Time 6k
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2.5V Single Supply Operation STBY REFERENCE AD7899 Selection of Input Ranges:
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10 V,
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5 V and
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2.5 V + 0 V to 2.5 V and 0 V to 5 V – RD High-Speed Parallel Interface which Also Allows Interfacing to 3 V Processors TRACK/HOLD Low Power, 80 mW Typ V DB13 INA SIGNAL 14-BIT OUTPUT Power-Saving Mode, 20
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W Typ SCALING LATCH V ADC INB DB0 Overvoltage Protection on Analog Inputs Power-Down Mode via STBY Pin CS CONVERSION INT/EXT INT BUSY/EOC CONTROL CLOCK CLOCK LOGIC SELECT CONVST CLKIN GND OPGND GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD7899 is a fast, low-power, 14-bit A/D converter that 1. The AD7899 features a fast (2.2 µs) ADC allowing through- operates from a single 5 V supply. The part contains a 2.2 µs put rates of up to 400 kSPS. successive-approximation ADC, a track/hold amplifier, 2.5 V 2. The AD7899 operates from a single 5 V supply and con- reference, on-chip clock oscillator, signal conditioning circuitry, sumes only 80 mW typ making it ideal for low power and and a high-speed parallel interface. The part accepts analog input portable applications. ranges of ± 10 V, ± 5 V, ± 2.5 V, 0 V to 2.5 V, and 0 V to 5 V. Overvoltage protection on the analog input for the part allows 3. The part offers a high-speed parallel interface. The interface the input voltage to be exceeded without damaging the parts. can operate in 3 V and 5 V mode allowing for easy connec- tion to 3 V or 5 V microprocessors, microcontrollers, and Speed of conversion can be controlled either by an internally digital signal processors. trimmed clock oscillator or by an external clock. 4. The part is offered in three versions with different analog A conversion start signal (CONVST) places the track/hold into input ranges. The AD7899-1 offers the standard industrial hold mode and initiates conversion. The BUSY/EOC signal ranges of ± 10 V and ± 5 V; the AD7899-2 offers a unipolar indicates the end of the conversion. range of 0 V to 2.5 or 0 V to 5 V, and the AD7899-3 has an Data is read from the part via a 14-bit parallel data bus using the input range of ± 2.5 V. standard CS and RD signals. Maximum throughput for the AD7899 is 400 kSPS. The AD7899 is available in a 28-lead SOIC and SSOP packages. REV. A 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 that
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