AD7983 Analog Devices, AD7983 Datasheet
AD7983
Specifications of AD7983
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AD7983 Summary of contents
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... It is compatible with 1 logic, using the separate supply VIO. The AD7983 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C. 250 kSPS 400 kSPS to 500 kSPS ...
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... CS Mode, 3-Wire with Busy Indicator .................................... 18 CS Mode, 4-Wire Without Busy Indicator ............................. 19 CS Mode, 4-Wire with Busy Indicator .................................... 20 Chain Mode Without Busy Indicator ...................................... 21 Chain Mode with Busy Indicator ............................................. 22 Application Hints ........................................................................... 23 Layout .......................................................................................... 23 Evaluating the Performance of the AD7983 ............................... 23 Outline Dimensions ....................................................................... 24 Ordering Guide .......................................................................... 24 Rev Page ...
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... Conditions IN+ − IN− IN+ IN− 100 kHz IN Acquisition phase VDD = 2.5 V ± 5% Full-scale step kHz kHz kHz kHz IN Rev Page AD7983 Min Typ Max Unit 16 Bits REF −0 0.1 V REF −0.1 +0 See the Analog Inputs section ...
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... AD7983 VDD = 2.5 V, VIO = 2 5.5 V, REF = Table 3. Parameter Conditions REFERENCE Voltage Range Load Current 1.33 MSPS SAMPLING DYNAMICS −3 dB Input Bandwidth Aperture Delay DIGITAL INPUTS Logic Levels V VIO > VIO > VIO ≤ VIO ≤ DIGITAL OUTPUTS ...
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... HSDISCK t DSDOSDI 1 Y% VIO 1 t DELAY DELAY AND MAXIMUM V USED. SEE DIGITAL INPUTS IH IL Figure 3. Voltage Levels for Timing AD7983 Max Unit 500 9 ...
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... AD7983 ABSOLUTE MAXIMUM RATINGS Table 5. Parameter Rating Analog Inputs 1 1 IN+, IN− to GND −0 Supply Voltage REF, VIO to GND −0 VDD to GND −0 VDD to VIO + −6 V Digital Inputs to GND −0 VIO + 0.3 V Digital Outputs to GND − ...
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... AI = analog input digital input digital output, and P = power. VIO SDI SCK SDO CNV . REF Rev Page REF 1 10 VIO VDD 2 9 SDI AD7983 IN SCK TOP VIEW (Not to Scale) IN– SDO GND 5 6 CNV Figure 5. 10-Lead QFN (LFCSP) Pin Configuration AD7983 ...
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... AD7983 TYPICAL PERFORMANCE CHARACTERISTICS VDD = 2.5 V, REF = 5 V, VIO = 3.3 V, unless otherwise noted. 1.25 POSITIVE INL: 0.30LSB NEGATIVE INL: –0.37LSB 1.00 0.75 0.50 0.25 0 –0.25 –0.50 –0.75 –1.00 –1.25 0 16384 32768 CODE Figure 6. Integral Nonlinearity vs. Code 120k 96765 100k 80k 60k 40k 17590 16604 20k ...
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... Figure 16. SNR, SINAD, and ENOB vs. Reference Voltage –70 –75 –80 –85 –90 –95 –100 –105 –110 –115 –120 1000 Rev Page AD7983 –35 – 105 TEMPERATURE (°C) Figure 15. SNR vs. Temperature ENOB SNR SINAD 3.0 3.5 4.0 4.5 5.0 REFERENCE VOLTAGE ( ...
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... AD7983 2.5 I VDD 2.0 1.5 1.0 I REF 0.5 I VIO 0 2.375 2.425 2.475 2.525 V VOLTAGE (V) DD Figure 18. Operating Currents vs. Supply 2.5 I VDD 2.0 1.5 1.0 I REF 0.5 I VIO 0 –55 –35 – TEMPERATURE (°C) Figure 19. Operating Currents vs. Temperature 2.575 2.625 65 85 105 125 Rev Page 1.5 1.4 1.3 1 VDD VIO 1.1 1.0 0.9 0.8 0.7 0.6 0.5 –55 –35 –15 ...
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... It is the time between the rising edge of the CNV input and when the input signal is held for a conversion. Transient Response Transient response is the time required for the ADC to accurately acquire its input after a full-scale step function is applied. N /Peak-to-Peak Noise) Rev Page AD7983 N (2 /RMS Input Noise) 2 ...
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... The AD7983 can be interfaced to any 1 digital logic family available in a 10-lead MSOP or a tiny 10-lead QFN (LFCSP) that allows space savings and flexible configurations. ...
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... Transfer Functions The ideal transfer characteristic for the AD7983 is shown in Figure 22 and Table 7. 111 ... 111 111 ... 110 111 ... 101 000 ... 010 000 ... 001 000 ... 000 –FSR –FSR + 1LSB –FSR + 0.5LSB ANALOG INPUT Figure 22. ADC Ideal Transfer Function VREF V– ...
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... AD7983. The noise coming from the driver is filtered by the AD7983 analog input circuit’s 1-pole, low-pass filter made by R filter, if one is used. Because the typical noise of the AD7983 is 39.7 μV rms, the SNR degradation due to the amplifier is C where: ...
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... REF and GND pins. POWER SUPPLY The AD7983 uses two power supply pins: a core supply (VDD) and a digital input/output interface supply (VIO). VIO allows direct interface with any logic between 1.8 V and 5 reduce the number of supplies needed, VIO and VDD can be tied together ...
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... AD7983 DIGITAL INTERFACE Though the AD7983 has a reduced number of pins, it offers flexibility in its serial interface modes. When in CS mode, the AD7983 is compatible with SPI, QSPI, and digital hosts. This interface can use either a 3-wire or a 4-wire interface. A 3-wire interface using the CNV, SCK, and SDO signals minimizes wiring connections useful, for instance, in isolated applications ...
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... CS MODE, 3-WIRE WITHOUT BUSY INDICATOR This mode is usually used when a single AD7983 is connected to an SPI-compatible digital host. The connection diagram is shown in Figure 26, and the corresponding timing is given in Figure 27. With SDI tied to VIO, a rising edge on CNV initiates a conversion, selects the CS mode, and forces SDO to high impedance ...
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... AD7983 CS MODE, 3-WIRE WITH BUSY INDICATOR This mode is usually used when a single AD7983 is connected to an SPI-compatible digital host that has an interrupt input. The connection diagram is shown in Figure 28, and the corresponding timing is given in Figure 29. With SDI tied to VIO, a rising edge on CNV initiates a conversion, selects the CS mode, and forces SDO to high impedance ...
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... CS MODE, 4-WIRE WITHOUT BUSY INDICATOR This mode is usually used when multiple AD7983s are connected to an SPI-compatible digital host. A connection diagram example using two AD7983s is shown in Figure 30, and the corresponding timing is given in Figure 31. With SDI high, a rising edge on CNV initiates a conversion, selects the CS mode, and forces SDO to high impedance. In this ...
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... AD7983 CS MODE, 4-WIRE WITH BUSY INDICATOR This mode is usually used when a single AD7983 is connected to an SPI-compatible digital host that has an interrupt input, and when it is desired to keep CNV, which is used to sample the analog input, independent of the signal used to select the data reading. This requirement is particularly important in applications where low jitter on CNV is desired ...
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... CHAIN MODE WITHOUT BUSY INDICATOR This mode can be used to daisy-chain multiple AD7983s on a 3-wire serial interface. This feature is useful for reducing component count and wiring connections, for example, in isolated multiconverter applications or for systems with a limited interfacing capacity. Data readback is analogous to clocking a shift register. ...
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... When all ADCs in the chain have completed their conversions, the SDO pin of the ADC closest to the digital host (see the AD7983 ADC labeled C in Figure 36) is driven high. This transition on SDO can be used as a busy indicator to trigger the data readback controlled by the digital host ...
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... The pinout of the AD7983, with all its analog signals on the left side and all its digital signals on the right side, eases this task. Avoid running digital lines under the device because these couple noise onto the die, unless a ground plane under the AD7983 is used as a shield ...
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... Temperature Range AD7983BRMZ −40°C to +85°C AD7983BRMZRL7 −40°C to +85°C AD7983BCPZ-R2 −40°C to +85°C AD7983BCPZ-RL −40°C to +85°C AD7983BCPZ-RL7 −40°C to +85°C 2 EVAL-AD7983CBZ 3 EVAL-CONTROL BRD RoHS Compliant Part. 2 This board can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL BRD3 for evaluation/demonstration purposes. ...