Datasheet AD7621 (Analog Devices)

16-Bit, 2 LSB INL, 3 MSPS PulSAR® ADC AD7621 FEATURES FUNCTIONAL BLOCK DIAGRAM Throughput TEMP REFBUFIN REF REFGND DVDD DGND 3 MSPS (wideband warp and warp mode) AGND 2 MSPS (normal mode) AD7621 OVDD AVDD 1.25 MSPS (impulse mode) OGND REF 2.048 V internal reference REF AMP SERIAL PORT Differential input range: ±V 16 IN+ REF (VREF up to 2.5 V) SWITCHED D[15:0] CAP DAC INL: ±2 LSB maximum, ±1 LSB typical IN– SER/PAR PARALLEL 16-bit resolution with no missing codes INTERFACE BUSY SINAD: 89 dB typical @ 100 kHz PDREF CLOCK RD PDBUF CS THD: −101 dB typical @ 100 kHz CONTROL LOGIC AND PD CALIBRATION CIRCUITRY OB/2C No pipeline delay (SAR architecture) RESET BYTESWAP Parallel (16- or 8-bit bus) and serial 5 V/3.3 V/2.5 V interface
001
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible WARP IMPULSE CNVST
04565-
2.5 V single-supply operation
Figure 1.
Power dissipation: 65 mW typical @ 3 MSPS Table 1. PulSAR Selection 48-lead LQFP and 48-lead LFCSP_VQ packages 800 to Speed upgrade of the AD7677 Type/kSPS 100 to 250 500 to 570 1000 >1000 APPLICATIONS
Pseudo AD7651 AD7650/52 AD7653 Differential AD7660/61 AD7664/66 AD7667
Medical instruments
True Bipolar AD7663 AD7665 AD7671
High speed data acquisition
True
Digital signal processing
Differential AD7675 AD7676 AD7677 AD7621
Communications
18-Bit AD7678 AD7679 AD7674 AD7641
Instrumentation
Multichannel/
Spectrum analysis
Simultaneous AD7654 AD7655
ATE GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD7621 is a 16-bit, 3 MSPS, charge redistribution SAR, 1. Fast Throughput. fully differential analog-to-digital converter (ADC) that The AD7621 is a 3 MSPS, charge redistribution, operates from a single 2.5 V power supply. It contains a high 16-bit SAR ADC. speed 16-bit sampling ADC, an internal conversion clock, an 2. Superior Linearity. internal reference (and buffer), error correction circuits, and The AD7621 has no missing 16-bit code. both serial and parallel system interface ports. It features two 3. Internal Reference. very high sampling rate modes (wideband warp and warp), a The AD7621 has a 2.048 V internal reference with a fast mode (normal) for asynchronous rate applications, and a typical drift of ±7 ppm/°C. reduced power mode (impulse) for low power applications 4. Single-Supply Operation. where the power is scaled with the throughput. Operation is The AD7621 operates from a 2.5 V single supply and specified from −40°C to +85°C. typically dissipates 65 mW. In impulse mode, its power dissipation decreases with t e h throughput. 5. Serial or Parallel Interface. Versatile parallel (16- or 8-bit bus) or 2-wire serial interface arrangement compatible with 2.5 V, 3.3 V, or 5 V logic.
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. Specifications subject to change without notice. No license is granted by implication One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. or otherwise under any patent or patent rights of Analog Devices. Trademarks and Tel: 781.329.4700 www.analog.com registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2005 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS SPECIFICATIONS TIMING SPECIFICATIONS SERIAL CLOCK TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION MODES OF OPERATION TRANSFER FUNCTIONS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE Single-to-Differential Driver VOLTAGE REFERENCE INPUT Internal Reference External 1.2 V Reference and Internal Buffer External Reference Reference Decoupling Temperature Sensor POWER SUPPLY Power Sequencing Power-Up POWER DISSIPATION VS. THROUGHPUT CONVERSION CONTROL INTERFACES DIGITAL INTERFACE RESET PARALLEL INTERFACE Master Parallel Interface Slave Parallel Interface 8-Bit Interface (Master or Slave) SERIAL INTERFACE MASTER SERIAL INTERFACE Internal Clock SLAVE SERIAL INTERFACE External Clock External Discontinuous Clock Data Read After Conversion External Clock Data Read During Previous Conversion MICROPROCESSOR INTERFACING SPI Interface (ADSP-219x) APPLICATION LAYOUT EVALUATING THE AD7621 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE