5 V Single Supply a 14-Bit 400 kSPS ADC AD7899 FEATURES FUNCTIONAL BLOCK DIAGRAM Fast (2.2 s) 14-Bit ADC V V AVDD REF DRIVE 400 kSPS Throughput Rate 0.3 s Track/Hold Acquisition Time 6k 2.5V STBY Single Supply Operation REFERENCE AD7899 Selection of Input Ranges: 10 V, 5 V and 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 DB13 Low Power, 80 mW Typ V INA SIGNAL OUTPUT 14-BIT Power-Saving Mode, 20 W Typ SCALING LATCH ADC V INB DB0 Overvoltage Protection on Analog Inputs Power-Down Mode via STBY Pin CS CONVERSION INT/EXT INT BUSY/EOC CONTROL CLOCK CLOCK SELECT LOGIC 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 s) ADC allowing through- operates from a single 5 V supply. The part contains a 2.2 s 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. 3. The part offers a high-speed parallel interface. The interface Overvoltage protection on the analog input for the part allows can operate in 3 V and 5 V mode allowing for easy connec- the input voltage to be exceeded without damaging the parts. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties that Tel: 781/329-4700 www.analog.com may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781/326-8703 Analog Devices, Inc., 2001(V = 5 V 5%, AGND = DGND = 0 V, V = Internal. Clock = Internal, all specifications DD REF T to T and valid for V = 3 V 5% and 5 V 5% unless otherwise noted.) AD7899SPECIFICATIONS MIN MAX DRIVE ABS 1 1 1 Parameter Version Version Version Unit Test Conditions/Comments SAMPLE AND HOLD 0.1 dB Full Power Bandwidth 500 500 500 kHz typ 3 dB Full Power Bandwidth 4.5 4.5 4.5 MHz typ Aperture Delay 20 20 20 ns max Aperture Jitter 25 25 25 ps typ 2 DYNAMIC PERFORMANCE f = 100 kHz, f = 400 kSPS IN S AD7899-1 Signal to (Noise + Distortion) 3 Ratio 25 C 78 78 78 dB min T to T 78 78 77 dB min MIN MAX 3 Total Harmonic Distortion 84 84 82 dB max 3 Peak Harmonic or Spurious Noise 86 86 85 dB max AD7899-2 Signal to (Noise + Distortion) 3 Ratio 25 C 78 dB min T to T 77 dB min MIN MAX 3 Total Harmonic Distortion 82 dB max 3 Peak Harmonic or Spurious Noise 82 dB max AD7899-3 Signal to (Noise + Distortion) 3 Ratio 25 C 78 78 dB min T to T 77 77 dB min MIN MAX 3 Total Harmonic Distortion 84 84 dB max 3 Peak Harmonic or Spurious Noise 86 86 dB max 3 Intermodulation Distortion fa = 49 kHz, fb = 50 kHz 2nd Order Terms 89 89 89 dB typ 3rd Order Terms 89 89 89 dB typ DC ACCURACY Resolution 14 14 14 Bits 3 Relative Accuracy (INL) 2 1.5 2 LSB max 3 Differential Nonlinearity (DNL) 1 1 1 LSB max No Missing Codes Guaranteed AD7899-1 Input Voltage Range 5, 10 5, 10 Volts Input Current 0.8, 0.8 0.8, 0.8 mA max V = 5 V and 10 V Respectively IN 3 Positive Gain Error 10 8 12 LSB max 3 Negative Gain Error 10 8 12 LSB max Bipolar Zero Error 12 8 12 LSB max AD7899-2 Input Voltage Range 0 to 2.5 Volts 0 to 5 Input Current 0.4, 800 A max V = 2.5 V, V = 5 V IN IN 3 Positive Gain Error 14 LSB max 3 Offset Error 10 LSB max AD7899-3 Input Voltage Range 2.5 2.5 Volts Input Current 0.8 0.8 mA max V = 2.5 V IN 3 Positive Gain Error 14 12 LSB max 3 Negative Gain Error 14 12 LSB max Bipolar Zero Error 14 12 LSB max REFERENCE INPUT/OUTPUT V IN Input Voltage Range 2.375/2.625 2.375/2.625 2.375/2.625 V /V 2.5 V 5% REF MIN MAX 4 V IN Input Capacitance 10 10 10 pF max REF V OUT Output Voltage 2.5 2.5 2.5 V nom REF V OUT Error 25 C 10 10 10 mV max REF V OUT Error T to T 20 20 25 mV max REF MIN MAX V OUT Temperature Coefficient 25 25 25 ppm/ C typ REF V OUT Output Impedance 6 6 6 k typ See Reference Section REF 2 REV. 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