AD7664 Analog Devices, AD7664 Datasheet
AD7664
Specifications of AD7664
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AD7664 Summary of contents
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... The AD7664 has a maximum integral nonlinearity of 2.5 LSBs with no missing 16-bit code. 3. Single-Supply Operation The AD7664 operates from a single 5 V supply and dissipates only a maximum of 115 mW. In Impulse Mode, its power dissipation decreases with the throughput to, for instance, only 21 µ 100 SPS throughput. It consumes 7 µW maximum when in power-down ...
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... AD7664 –SPECIFICATIONS Parameter RESOLUTION ANALOG INPUT Voltage Range Operating Input Voltage Analog Input CMRR Input Current Input Impedance THROUGHPUT SPEED Complete Cycle Throughput Rate Time between Conversions Complete Cycle Throughput Rate Complete Cycle Throughput Rate DC ACCURACY Integral Linearity Error Differential Linearity Error ...
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... L –3– Typ Max +85 Typ Max Note 1 25 1.5/1.75/2 2 1.5/1.75/2 1.5/1.75 25/275/525 2.75/3/3.25 1/1.25/1 pF; otherwise, the load maximum. AD7664 Unit °C Unit ns µs ns µ µ µ µs µ ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7664 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... IDENTIFIER NC 3 DGND 4 OB/2C 5 AD7664 WARP 6 TOP VIEW IMPULSE 7 (Not to Scale) SER/PAR PIN FUNCTION DESCRIPTIONS –5– AD7664 36 AGND CNVST RESET DGND 29 BUSY 28 D15 27 D14 26 D13 25 D12 ...
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... Chip Select. When CS and RD are both LOW, the interface parallel or serial output bus is enabled also used to gate the external clock. Reset Input. When set to a logic HIGH, reset the AD7664. Current conversion if any is aborted. If not used, this pin could be tied to DGND. ...
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... CNVST input to when the input signal is held for a conversion. Transient Response The time required for the AD7664 to achieve its rated accuracy after a full-scale step function is applied to its input. Overvoltage Recovery The time required for the ADC to recover to full accuracy after an analog input signal 150% of full-scale is reduced to 50% of the full-scale value ...
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... Performance Characteristics AD7664 2.5 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –2.5 0 16384 32768 CODE TPC 1. Integral Nonlinearity vs. Code 8000 7288 7148 7000 6000 5000 4000 3000 2000 753 1000 7F86 7F87 7F88 7F89 7F8A 7F8B CODE – Hexa TPC 2. Histogram of 16,384 Conversions Input ...
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... DVDD, WARP/NORMAL 1k 95 100 0 0.001 1000 0.1 1 TPC 12. Operating Currents vs. Sample Rate –9– AD7664 SNR S/(N+D) –40 –30 –20 –10 0 INPUT LEVEL – dB –96 –98 THD –100 SNR –102 –104 – 105 125 TEMPERATURE – ...
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... AD7664 10 8 FULL-SCALE ERROR –2 –4 –6 –8 –10 –55 –35 – TEMPERATURE ( C) TPC 13. Zero Error, Full-Scale Error vs. Temperature 50 OVDD = 2.7V OVDD = 5V 100 C – TPC 14. Typical Delay vs. Load Capacitance C 100 ZERO ERROR ...
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... ADC that does not exhibit any pipeline or latency, making it ideal for multiple multiplexed channel applications. The AD7664 can be operated from a single 5 V supply and interfaced to either digital logic housed in a 48-lead LQFP package or a 48-lead LFCSP package that saves space and allows flexible configurations as either a serial or parallel interface ...
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... Using the OB/2C digital input, the AD7664 offers two output codings: straight binary and twos complement. The LSB size is /65536, which is about 38.15 µV. The ideal transfer charac- V REF teristics for the AD7664 are shown in Figure 4 and Table II. 1 LSB = V /65536 REF 111...111 111 ...
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... Figure 8. THD vs. Analog Input Frequency and Source Resistance Driver Amplifier Choice Although the AD7664 is easy to drive, the driver amplifier needs to meet at least the following requirements: • The driver amplifier and the AD7664 analog input circuit must be able, together, to settle for a full-scale step of the capacitor array at a 16-bit level (0.0015%). In the amplifier’ ...
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... The AD780 can be selected with reference voltage. Power Supply The AD7664 uses three sets of power supply pins: an analog 5 V supply AVDD, a digital 5 V core supply DVDD, and a digital input/output interface supply OVDD. The OVDD supply allows direct interface with any logic working between 2 ...
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... The serial interface is multiplexed on the parallel databus. The AD7664 digital interface also accommodates both logic by simply connecting the OVDD supply pin of the AD7664 to the host system interface digital supply. Finally, by using the OB/2C input pin, either twos complement or straight binary coding can be used ...
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... Internal Clock The AD7664 is configured to generate and provide the serial data clock SCLK when the EXT/INT pin is held LOW. The AD7664 also generates a SYNC signal to indicate to the host when the serial data is valid. The serial clock SCLK and the SYNC signal can be inverted, if desired ...
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... Figure 18. Slave Serial Data Timing for Reading (Read after Convert) Because the AD7664 is used with a fast throughput, the Mas- ter Read During Conversion Mode is the most often recom- mended Serial Mode, when it can be used. In this mode, the serial clock and data toggle at appropriate instants that mini- mize potential feedthrough between digital activity and the critical conversion decisions ...
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... Figure 21 shows an interface diagram between the AD7664 and an SPI-equipped ADSP-219x. To accommodate the slower speed of the DSP, the AD7664 acts as a slave device and data must be read after conversion. This mode also allows the daisy-chain feature. The convert command can be initiated in response to an internal timer interrupt ...
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... It is recommended to avoid running digital lines under the device, because these couple noise onto the die. The analog ground plane should be allowed to run under the AD7664 to avoid noise coupling. Fast switching signals like CNVST or clocks should be shielded with digital ground to avoid radiating noise to other sections of the board and should never run near analog signal paths ...
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... AD7664 1.45 1.40 1.35 0.15 SEATING 0.05 PLANE ROTATED 90 CCW 7.00 BSC SQ PIN 1 INDICATOR TOP VIEW 1.00 12 MAX 0.85 0.80 SEATING PLANE OUTLINE DIMENSIONS 48-Lead Low Profile Quad Flat Package [LQFP] (ST-48) Dimensions shown in millimeters 0.75 1.60 0.60 MAX 0.45 1 SEATING PLANE 10 6 0.20 2 0.09 VIEW 0.08 MAX 0.50 COPLANARITY BSC VIEW A COMPLIANT TO JEDEC STANDARDS MS-026BBC 48-Lead Lead Frame Chip Scale Package [LFCSP] ...
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... Changes to Table III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Added CP- Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 11/01—Data Sheet changed from REV REV. C. Edits to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edits to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 TPC 12 replaced with new data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Edits to Voltage Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Edits to OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8/01 Revision History continued on next page REV. E –21– AD7664 Page ...
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... AD7664 Revision History Location 8/01—Data Sheet changed from REV REV. B. Edit to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edit to PRODUCT HIGHLIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edit to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Edit to Timing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Edit to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Edit to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Edit to PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Edits to TPC Edits to TPCs Edit to Figure Edit to Driver Amplifier Choice section ...
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