Datasheet AD7676 (Analog Devices)

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16-Bit, 1 LSB INL, 500 kSPS, Differential ADC AD7676 FEATURES FUNCTIONAL BLOCK DIAGRAM Throughput: 500 kSPS AVDD AGND REF REFGND DVDD DGND INL: 1 LSB Max ( 0.0015% of Full Scale) 16-Bit Resolution with No Missing Codes OVDD S/(N+D): 94 dB Typ @ 45 kHz AD7676 OGND THD: –110 dB Typ @ 45 kHz SERIAL Differential Input Range: PORT 2.5 V IN+ SWITCHED SER/PAR Both AC and DC Specifications IN– CAP DAC BUSY No Pipeline Delay 16 Parallel (8 Bits/16 Bits) and Serial 5 V/3 V Interface D[15:0] SPI™/QSPI™/MICROWIRE™/DSP Compatible CLOCK PARALLEL CS INTERFACE PD Single 5 V Supply Operation CONTROL LOGIC AND RD RESET CALIBRATION CIRCUITRY 67 mW Typical Power Dissipation, 15 W @ 100 SPS OB/2C Power-Down Mode: 7 W Max BYTESWAP Packages: 48-Lead Quad Flatpack (LQFP) CNVST 48-Lead Frame Chip Scale (LFCSP) Pin-to-Pin Compatible with the AD7675 Table I. PulSAR Selection APPLICATIONS CT Scanners Type/kSPS 100–250 500–570 800–1000 Data Acquisition
Pseudo Differential AD7660 AD7650
Instrumentation
AD7664
Spectrum Analysis Medical Instruments
True Bipolar AD7663 AD7665 AD7671
Battery-Powered Systems
True Differential AD7675 AD7676 AD7677
Process Control
18-Bit AD7678 AD7679 AD7674 Simultaneous/ AD7654
GENERAL DESCRIPTION
Multichannel The AD7676 is a 16-bit, 500 kSPS, charge redistribution SAR, fully differential analog-to-digital converter (ADC) that oper- ates from a single 5 V power supply. The part contains a high
PRODUCT HIGHLIGHTS
speed 16-bit sampling ADC, an internal conversion clock, 1. Excellent INL error correction circuits, and both serial and parallel system The AD7676 has a maximum integral nonlinearity of 1.0 LSB interface ports. with no missing 16-bit code. The AD7676 is hardware factory-calibrated and is comprehen- 2. Superior AC Performances sively tested to ensure such ac parameters as signal-to-noise ratio The AD7676 has a minimum dynamic of 92 dB, 94 dB typical. (SNR) and total harmonic distortion (THD), in addition to the 3. Fast Throughput more traditional dc parameters of gain, offset, and linearity. The AD7676 is a 500 kSPS, charge redistribution, 16-bit It is fabricated using Analog Devices’ high performance, 0.6 micron SAR ADC with internal error correction circuitry. CMOS process and is available in a 48-lead LQFP or a tiny 4. Single-Supply Operation 48-lead LFCSP with operation specified from –40°C to +85°C. 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 SPI and QSPI are trademarks of Motorola, Inc. Versatile parallel (8 bits or 16 bits) or 2-wire serial interface MIRCOWIRE is a trademark of National Semiconductor Corporation. arrangement compatible with either 3 V or 5 V logic. 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 that
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS SPECIFICATIONS RESOLUTION ANALOG INPUT THROUGHPUT SPEED DC ACCURACY AC ACCURACY SAMPLING DYNAMICS REFERENCE DIGITAL INPUTS DIGITAL OUTPUTS POWER SUPPLIES TEMPERATURE RANGE TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ORDERING GUIDE PIN FUNCTION DESCRIPTIONS PIN FUNCTION DESCRIPTIONS (continued) PIN CONFIGURATION DEFINITION OF SPECIFICATIONS Integral Nonlinearity Error (INL) Differential Nonlinearity Error (DNL) +Full-Scale Error –Full-Scale Error Bipolar Zero Error Spurious-Free Dynamic Range (SFDR) Effective Number of Bits (ENOB) Total Harmonic Distortion (THD) Signal-to-Noise Ratio (SNR) Signal-to-(Noise + Distortion) Ratio (S/[N+D]) Aperture Delay Transient Response Typical Performance Characteristics CIRCUIT INFORMATION CONVERTER OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM Analog Inputs Single-to-Differential Driver Driver Amplifier Choice Voltage Reference Input Power Supply POWER DISSIPATION CONVERSION CONTROL DIGITAL INTERFACE PARALLEL INTERFACE SERIAL INTERFACE MASTER SERIAL INTERFACE Internal Clock SLAVE SERIAL INTERFACE External Clock External Discontinuous Clock Data Read after Conversion External Clock Data Read During Conversion MICROPROCESSOR INTERFACING SPI Interface (MC68HC11) ADSP-21065L in Master Serial Interface APPLICATION HINTS Layout Evaluating the AD7676 Performance OUTLINE DIMENSIONS Revision History