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AD7676 Dataheets PDF



Part Number AD7676
Manufacturers Analog Devices
Logo Analog Devices
Description Differential ADC
Datasheet AD7676 DatasheetAD7676 Datasheet (PDF)

a FEATURES Throughput: 500 kSPS INL: ؎1 LSB Max (؎ 0.0015% of Full-Scale) 16 Bits Resolution with No Missing Codes S/(N+D): 94 dB Typ @ 45 kHz THD: –110 dB Typ @ 45 kHz Differential Input Range: ؎ 2.5 V Both AC and DC Specifications No Pipeline Delay Parallel (8/16 Bits) and Serial 5 V/3 V Interface SPI™/QSPI™/MICROWIRE™/DSP Compatible Single 5 V Supply Operation 67 mW Typical Power Dissipation, 15 ␮W @ 100 SPS Power-Down Mode: 7 ␮ W Max Package: 48-Lead Quad Flat Pack (LQFP) Pin-to-Pin Compatib.

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a FEATURES Throughput: 500 kSPS INL: ؎1 LSB Max (؎ 0.0015% of Full-Scale) 16 Bits Resolution with No Missing Codes S/(N+D): 94 dB Typ @ 45 kHz THD: –110 dB Typ @ 45 kHz Differential Input Range: ؎ 2.5 V Both AC and DC Specifications No Pipeline Delay Parallel (8/16 Bits) and Serial 5 V/3 V Interface SPI™/QSPI™/MICROWIRE™/DSP Compatible Single 5 V Supply Operation 67 mW Typical Power Dissipation, 15 ␮W @ 100 SPS Power-Down Mode: 7 ␮ W Max Package: 48-Lead Quad Flat Pack (LQFP) Pin-to-Pin Compatible with the AD7675 APPLICATIONS CT Scanners Data Acquisition Instrumentation Spectrum Analysis Medical Instruments Battery-Powered Systems Process Control GENERAL DESCRIPTION 16-Bit, ؎1 LSB INL, 500 kSPS, Differential ADC AD7676* FUNCTIONAL BLOCK DIAGRAM AVDD AGND REF REFGND DVDD DGND OVDD AD7676 IN+ IN– SERIAL PORT SWITCHED CAP DAC 16 OGND SER/PAR BUSY DATA[15:0] CLOCK PD RESET PARALLEL INTERFACE CS RD OB/2C BYTESWAP CONTROL LOGIC AND CALIBRATION CIRCUITRY CNVST PRODUCT HIGHLIGHTS The AD7676 is a 16-bit, 500 kSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates from a single 5 V power supply. The part contains a high-speed 16-bit sampling ADC, an internal conversion clock, error correction circuits, and both serial and parallel system interface ports. The AD7676 is hardware factory calibrated and is comprehensively tested to ensure such ac parameters as signal-to-noise ratio (SNR) and total harmonic distortion (THD), in addition to the more traditional dc parameters of gain, offset, and linearity. It is fabricated using Analog Devices’ high-performance, 0.6 micron CMOS process and is available in a 48-lead LQFP with operation specified from –40°C to +85°C. 1. Excellent INL The AD7676 has a maximum integral nonlinearity of 1.0 LSB with no missing 16-bit code. 2. Superior AC Performances The AD7676 has a minimum dynamic of 92 dB, 94 dB typical. 3. Fast Throughput The AD7676 is a 500 kSPS, charge redistribution, 16-bit SAR ADC with internal error correction circuitry. 4. Single-Supply Operation The AD7676 operates from a single 5 V supply and typically dissipates only 67 mW. It consumes 7 µW maximum when in power-down. 5. Serial or Parallel Interface Versatile parallel (8 or 16 bits) or 2-wire serial interface arrangement compatible with either 3 V or 5 V logic. *Patent pending SPI and QSPI are trademarks of Motorola Inc. MICROWIRE is a trademark of National Semiconductor Inc. REV. 0 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 may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 AD7676–SPECIFICATIONS (–40؇C to +85؇C, AVDD = DVDD = 5 V, OVDD = 2.7 V to 5.25 V, unless otherwise noted.) Parameter RESOLUTION ANALOG INPUT Voltage Range Operating Input Voltage Analog Input CMRR Input Current Input Impedance THROUGHPUT SPEED Complete Cycle Throughput Rate DC ACCURACY Integral Linearity Error No Missing Codes Transition Noise +Full-Scale Error2 –Full-Scale Error2 Zero Error2 Power Supply Sensitivity AC ACCURACY Signal-to-Noise Spurious Free Dynamic Range Total Harmonic Distortion Signal-to-(Noise+Distortion) –3 dB Input Bandwidth SAMPLING DYNAMICS Aperture Delay Aperture Jitter Transient Response REFERENCE External Reference Voltage Range External Reference Current Drain DIGITAL INPUTS Logic Levels VIL VIH IIL IIH DIGITAL OUTPUTS Data Format Pipeline Delay VOL VOH POWER SUPPLIES Specified Performance AVDD DVDD OVDD Operating Current AVDD DVDD4 OVDD4 Power Dissipation4 In Power-Down Mode5 TEMPERATURE RANGE6 Specified Performance VIN+ – VIN– VIN+, VIN– to AGND fIN = 10 kHz 500 kSPS Throughput Conditions Min 16 –VREF –0.1 79 5 See Analog Input Section 1 500 +1 0.35 –22 –22 –8 +22 +22 +8 µs kSPS LSB1 Bits LSB LSB LSB LSB LSB dB3 dB3 dB3 dB3 dB3 dB3 dB3 dB3 dB3 MHz ns ps rms µs V µA +VREF +3 Typ Max Unit Bits V V dB µA 0 –1 16 AVDD = 5 V ± 5% fIN = 20 kHz fIN = 45 kHz fIN = 20 kHz fIN = 45 kHz fIN = 20 kHz fIN = 45 kHz fIN = 20 kHz fIN = 45 kHz fIN = 45 kHz, –60 dB Input ± 0.7 94 94 110 110 –110 –110 94 94 34 3.9 2 5 92 104.5 –103.5 92 Full-Scale Step 2.3 500 kSPS Throughput 2.5 170 750 AVDD – 1.85 –0.3 +2.0 –1 –1 +0.8 OVDD + 0.3 +1 +1 V V µA µA ISINK = 1.6 mA ISOURCE = –100 µA Parallel or Serial 16-Bit Conversion Results Available Immediately After Completed Conversion 0.4 OVDD – 0.6 V V 4.75 4.75 2.7 500 kSPS Throughput 5 5 9.5 3.9 37 67 15 5.25 5.25 5.25 V V V mA mA µA mW µW µW °C 500 kSPS Throughput 100 SPS Throughput 74 7 TMIN to TMAX –40 +85 NOTES 1 LSB means Least Significant Bit. With the ± 2.5 V input range, one LSB is 76.3 µV. 2 See Definition of Spe.


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