Datasheet AD7623 (Analog Devices)

16-Bit, 1.33 MSPS PulSAR® ADC AD7623 FEATURES FUNCTIONAL BLOCK DIAGRAM Throughput: 1.33 MSPS TEMP REFBUFIN REF REFGND DVDD DGND 2.048 V internal reference AGND Differential input range: ±VREF (VREF up to 2.5 V) AD7623 OVDD AVDD INL: ±1 LSB typical OGND REF 16-bit resolution with no missing codes REF AMP SERIAL SINAD: 88 dB typical @ 100 kHz PORT IN+ 16 SWITCHED D[15:0] THD: −97 dB typical @ 100 kHz IN– CAP DAC SER/PAR PARALLEL No pipeline delay (SAR architecture) INTERFACE BUSY Parallel (16- or 8-bit bus) and serial 5 V/3.3 V/2.5 V interface PDREF CLOCK RD SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible PDBUF CS CONTROL LOGIC AND 2.5 V single-supply operation PD CALIBRATION CIRCUITRY OB/2C Power dissipation: 45 mW typical @ 1.33 MSPS RESET BYTESWAP 48-lead LQFP and LFCSP_VQ packages
001
Speed upgrade of the AD7677 CNVST
05574- Figure 1.
APPLICATIONS Table 1. PulSAR Selection Medical instruments 800 to High speed data acquisition Type/kSPS 100 to 250 500 to 570 1000 >1000 Digital signal processing
Pseudo AD7651 AD7650/52 AD7653
Communications
Differential AD7660/61 AD7664/66 AD7667
Instrumentation
True Bipolar AD7663 AD7665 AD7671
Spectrum analysis
True AD7675 AD7676 AD7677 AD7621
ATE
Differential AD7623 18-Bit AD7678 AD7679 AD7674 AD7641 Multichannel/ AD7654 AD7655 Simultaneous
GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD7623 is a 16-bit, 1.33 MSPS, charge redistribution SAR, 1. Fast Throughput. fully differential analog-to-digital converter (ADC) that The AD7623 is a 1.33 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 AD7623 has no missing 16-bit code. both serial and parallel system interface ports. Power consump- 3. Internal Reference. tion is automatically scaled with throughput, making it ideal The AD7623 has a 2.048 V internal reference with a for battery-powered applications. It is available in 48-lead, low typical drift of ±7 ppm/°C. profile quad flat package (LQFP) and a lead frame chip-scale (LFCSP_VQ) package. Operation is specified from 4. Single-Supply Operation. −40°C to +85°C. The AD7623 operates from a 2.5 V single supply and typically dissipates 45 mW. Its power dissipation decreases with the 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.
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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 TRANSFER FUNCTIONS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE Single-to-Differential Driver VOLTAGE REFERENCE INPUT Internal Reference (PDBUF = Low, PDREF = Low) External 1.2 V Reference and Internal Buffer (PDREF = High, PBBUF = Low) External Reference (PDBUF = High, PRBUF = High) 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 AD7623 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE