AD7607 Analog Devices, AD7607 Datasheet
AD7607
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AD7607 Summary of contents
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... AD7606-6 6 AD7606-4 4 AD7607 8 REFCAPB REFCAPA REFIN/REFOUT REF SELECT 2.5V REF AGND OUT SERIAL D B OUT PARALLEL/ RD/SCLK SERIAL CS INTERFACE PAR/SER/BYTE SEL V DRIVE PARALLEL DB[15:0] CLK OSC BUSY CONTROL INPUTS FRSTDATA ©2010-2012 Analog Devices, Inc. All rights reserved. AD7607 www.analog.com ...
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... AD7607 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 General Description ......................................................................... 3 Specifications ..................................................................................... 4 Timing Specifications .................................................................. 6 Absolute Maximum Ratings .......................................................... 10 Thermal Resistance .................................................................... 10 ESD Caution ................................................................................ 10 Pin Configuration and Function Descriptions ........................... 11 Typical Performance Characteristics ........................................... 14 Terminology .................................................................................... 18 Theory of Operation ...................................................................... 19 Converter Details........................................................................ 19 Analog Input ............................................................................... 19 REVISION HISTORY 1/12—Rev Rev. B Changes to Analog Input Ranges Section .................................... 19 7/10— ...
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... V reference and reference buffer; and high speed serial and parallel interfaces. The AD7607 operates from a single 5 V supply and can accom- modate ±10 V and ±5 V true bipolar input signals while sampling at throughput rates 200 kSPS for all channels. The input 1 Patent pending ...
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... AD7607 SPECIFICATIONS V = 2.5 V external/internal 4. 5. REF CC Table 2. Parameter DYNAMIC PERFORMANCE Signal-to-(Noise + Distortion) (SINAD) Signal-to-Noise Ratio (SNR) 2 Total Harmonic Distortion (THD) 2 Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) 2 Second-Order Terms Third-Order Terms Channel-to-Channel Isolation 2 ANALOG INPUT FILTER ...
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... Test Conditions/Comments REF SELECT = 1 REFIN/REFOUT I = 100 µA SOURCE I = 100 µA SINK Twos complement All eight channels included; see Table 3 All eight channels included Digital inputs = DRIVE Rev Page AD7607 Min Typ Max Unit 2.475 2.5 2.525 V ±1 µA 7.5 pF 2.49/ V 2.505 ± ...
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... AD7607 TIMING SPECIFICATIONS DRIVE Table 3. Limit at T Parameter Min PARALLEL/SERIAL/BYTE MODE t CYCLE t CONV 3.45 7.87 16. 133 257 t WAKE-UP STANDBY t WAKE-UP SHUTDOWN Internal Reference External Reference t 50 RESET t 20 OS_SETUP t 20 OS_HOLD ...
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... DRIVE above 2.3 V DRIVE Delay from RD falling edge to FRSTDATA high above 4.75 V DRIVE above 3.3 V DRIVE above 2.7 V DRIVE above 2.3 V DRIVE Rev Page A/D B three-state disabled/delay from CS OUT OUT A/D B valid hold time OUT OUT A/D B three-state enabled OUT OUT AD7607 ...
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... AD7607 Limit at T Parameter Min Sample tested during initial release to ensure compliance. All input signals are specified with t 2 The delay between the CONVST x signals was measured as the maximum time allowed while ensuring a <3 LSB performance matching between channel sets. ...
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... HIGH LOW INVALID BYTE V1 BYTE Figure 7. BYTE Mode Read Operation Rev Page DB1 DB0 HIGH LOW BYTE V8 BYTE AD7607 ...
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... AD7607 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 4. Parameter AV to AGND AGND DRIVE Analog Input Voltage to AGND 1 Digital Input Voltage to AGND Digital Output Voltage to AGND REFIN to AGND Input Current to Any Pin Except Supplies 1 Operating Temperature Range B Version Storage Temperature Range ...
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... Table 8). DB14 is used as the HBEN pin. DB[7:0] transfer the 16-bit conversion results in two RD operations, with DB0 as the LSB of the data transfers. Standby Mode Input. This pin is used to place the AD7607 into one of two power-down modes: standby mode or shutdown mode. The power-down mode entered depends on the state of the RANGE pin, as shown in Table 7 ...
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... When the CONVST A or CONVST B pin transitions from low to high, the front-end track-and-hold circuitry for their respective analog inputs is set to hold. Reset Input. When set to logic high, the rising edge of RESET resets the AD7607. The part should receive a RESET pulse after power-up. The RESET high pulse should typically wide RESET pulse is applied during a conversion, the conversion is aborted ...
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... DB14 of the conversion result, which is a sign extended bit of the MSB, DB13. When PAR/SER/BYTE SEL = 1 and DB15/BYTE SEL = 1, the AD7607 operates in parallel byte interface mode, in which the HBEN pin is used to select if the most significant byte (MSB) or the least significant byte (LSB) of the conversion result is output first ...
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... AD7607 TYPICAL PERFORMANCE CHARACTERISTICS 0 AV INTERNAL REFERENCE –20 f SAMPLE T A ±10V RANGE –40 SNR: 85.07dB THD: –107.33dB 16,384 POINT FFT – –80 –100 –120 –140 –160 INPUT FREQUENCY (kHz) Figure 9. FFT ± Range 0 AV INTERNAL REFERENCE – ...
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... INPUT FREQUENCY (Hz) Figure 19. SNR vs. Input Frequency ± Range AVCC = VDRIVE = 5V INTERNAL REFERENCE f = 200kSPS SAMPLE 25°C A ±10V RANGE ALL 8 CHANNELS 80 10 100 1k 10k INPUT FREQUENCY (Hz) Figure 20. SNR vs. Input Frequency ± Range AD7607 100k 120k = 5V 100k 100k ...
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... AD7607 0.25 0.20 0.15 0.10 0. RANGE –0.05 –0.10 10V RANGE –0.15 200kSPS –0.20 AV EXTERNAL REFERENCE –0.25 –40 –25 – TEMPERATURE (°C) Figure 21. Bipolar Zero Code Error vs. Temperature 1.00 0.75 5V RANGE 0.50 0.25 10V RANGE 0 –0.25 –0.50 200kSPS –0.75 AV EXTERNAL REFERENCE –1.00 –40 –25 – TEMPERATURE (°C) Figure 22. Bipolar Zero Code Error Matching vs. Temperature – ...
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... OS16 OVERSAMPLING RATIO Figure 27. Supply Current vs. Oversampling Rate 140 130 120 ±10V RANGE 110 ±5V RANGE 100 DRIVE INTERNAL REFERENCE AD7607 RECOMMENDED DECOUPLING USED 200kSPS SAMPLE T = 25° 100 200 300 400 500 600 700 AV NOISE FREQUENCY (kHz) CC Figure 28 ...
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... The theoretical signal-to-(noise + distortion) ratio for an ideal N-bit converter with a sine wave input is given by Signal-to-(Noise + Distortion) = (6. 1.76) dB Thus, for a 14-bit converter, the signal-to-(noise + distortion) is 86.04 dB. Total Harmonic Distortion (THD) The ratio of the rms sum of the harmonics to the fundamental. For the AD7607 defined as THD (dB ...
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... AD7607 sampling frequency. This high analog input impedance elimi- nates the need for a driver amplifier in front of the AD7607, allowing for direct connection to the source or sensor. With the need for a driver amplifier eliminated, bipolar supplies (which are often a source of noise in a system) can be removed from the signal chain ...
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... The conversion clock for the part is internally generated, and the conversion time for all channels is 4 µs. On the AD7607, the BUSY signal returns low after all eight conversions to indicate the end of the conversion process. On the falling edge of BUSY, the track-and-hold amplifiers return to track mode. New data can ± ...
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... The AD7607 contains an on-chip 2.5 V bandgap reference. The REFIN/REFOUT pin allows access to the 2.5 V reference that generates the on-chip 4.5 V reference internally allows an external reference of 2 applied to the AD7607. An externally applied reference of 2 also gained up to 4.5 V, using the internal buffer. This 4.5 V buffered reference is the reference used by the SAR ADC ...
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... There are four AVCC supply pins on the part, and each of the four pins should be decoupled using a 100 nF capacitor at each supply pin and a 10 µF capacitor at the supply source. The AD7607 can operate with the internal reference or an externally applied reference. In this configuration, the AD7607 is configured to operate with the internal reference ...
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... OUT OUT (DB[7:0]). Simultaneously Sampling Two Sets of Channels The AD7607 also allows the analog input channels to be sampled simultaneously in two sets. This can be used in power-line protection and measurement systems to compensate for phase differences between current and voltage sensors system, this allows for up to 9° of phase compensation; and system, it allows for up to 10° ...
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... Figure 5. In this case, the data bus comes out of three-state on the falling edge The combined CS and RD signal allows the data to be clocked out of the AD7607 and to be read by the digital host. In this case used to frame the data transfer of each data channel. ...
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... OUT OUT used as a OUT READING DURING CONVERSION Data can be read from the AD7607 while BUSY is high and the conversions are in progress. This has little effect the performance B. OUT of the converter, and it allows a faster throughput rate to be achieved. A parallel, parallel byte, or serial read can be performed during conversions and when oversampling not enabled ...
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... AD7607 DIGITAL FILTER The AD7607 contains an optional first-order digital sinc filter that should be used in applications where slower throughput rates are used and digital filtering is required. The oversampling ratio of the digital filter is controlled using the oversampling pins, OS[2:0] (see Table 9 the MSB control bit, and the LSB control bit ...
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... Figure 44 to Figure 49 show the digital filter frequency profiles for the different oversampling ratios. The combination of the analog antialiasing filter and the oversampling digital filter helps to reduce the complexity of the design of the filter before the AD7607. The digital filtering combines steep roll-off and linear phase response. 0 – ...
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... AD7607 2000 1800 1600 1400 1200 1000 800 600 400 200 0 –2 –1 0 CODE Figure 50. Histogram of Codes, Oversampling the OS[2:0] pins are set to select an oversampling ratio of 8, for example, the next CONVST x rising edge takes the first sample for each channel. The remaining seven samples for all channels are taken with an internally generated sampling signal ...
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... In the case of the split plane, the digital and analog ground planes should be joined in only one place, preferably as close as possible to the AD7607. If the AD7607 system where multiple devices require analog-to-digital ground connections, the connection should still be made at only one point: a star ground point that should be established as close as possible to the AD7607 ...
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... Figure 54 shows a layout with two AD7607 devices. The AV supply plane runs to the right of both devices. The V track runs to the left of the two AD7607 devices. The reference chip is positioned between the two AD7607 devices, and the reference voltage track runs north to Pin and south to Pin ...
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... COMPLIANT TO JEDEC STANDARDS MS-026-BCD Figure 55. 64-Lead Low Profile Quad Flat Package [LQFP] (ST-64-2) Dimensions shown in millimeters Package Description 64-Lead Low Profile Quad Flat Package [LQFP] 64-Lead Low Profile Quad Flat Package [LQFP] Evaluation Board Converter Evaluation Development Rev Page AD7607 49 48 10.20 10. 0.27 0.22 ...
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... AD7607 NOTES ©2010-2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08096-0-1/12(B) Rev Page Data Sheet ...