AD7693 Analog Devices, AD7693 Datasheet
AD7693
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AD7693 Summary of contents
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... ADCs on a single 3-wire bus and provides an optional busy indicator compatible with 1 logic, using the separate VIO supply. The AD7693 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C. 65536 49152 One Technology Way, P ...
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... CS Mode, 3-Wire Without Busy Indicator ............................. 17 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 AD7693 Performance............................................. 23 Outline Dimensions ....................................................................... 24 Ordering Guide .......................................................................... 24 Rev Page ...
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... AD7693 Unit Bits kSPS ns Bits LSB 2 LSB LSB LSB ppm/°C LSB ppm/°C ppm ...
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... AD7693 VDD = 4 5.5 V, VIO = 2 VDD, V Table 3. Parameter REFERENCE Voltage Range Load Current SAMPLING DYNAMICS −3 dB Input Bandwidth Aperture Delay DIGITAL INPUTS Logic Levels DIGITAL OUTPUTS Data Format 1 Pipeline Delay POWER SUPPLIES VDD VIO VIO Range ...
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... CYC t CNVH t SCK t SCK t SCKL t SCKH t HSDO t DSDO DIS t SSDICNV t HSDICNV t SSCKCNV t HSCKCNV t SSDISCK t HSDISCK t DSDOSDI Rev Page AD7693 , unless otherwise noted. Min Typ Max 0.5 1.6 400 2 Unit μ ...
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... AD7693 ABSOLUTE MAXIMUM RATINGS Table 5. Parameter Rating Analog Inputs 1 1 IN+, IN− GND − 0 VDD + 0 ±130 mA REF GND − 0 VDD + 0.3 V Supply Voltages VDD, VIO to GND −0 VDD to VIO ±7 V Digital Inputs to GND −0 VIO + 0.3 V Digital Outputs to GND − ...
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... Rev Page REF 1 10 VIO VDD 2 9 SDI AD7693 IN SCK TOP VIEW IN– SDO (Not to Scale) GND 5 6 CNV NOTES 1. THE EXPOSED PAD IS CONNECTED TO GND. THIS CONNECTION IS NOT REQUIRED TO MEET THE ELECTRICAL PERFORMANCES. Figure 6. 10-Lead QFN (LFCSP) Pin Configuration AD7693 ...
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... AD7693 TERMINOLOGY Least Significant Bit (LSB) The LSB is the smallest increment that can be represented by a converter. For a differential analog-to-digital converter with N bits of resolution, the LSB expressed in volts (V) = REF LSB N 2 Integral Nonlinearity Error (INL) INL refers to the deviation of each individual code from a line drawn from negative full scale through positive full scale. The point used as negative full scale occurs ½ ...
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... A B CODE IN HEX Figure 11. Histogram Input at the Code Transition SNR THD –8 –6 –4 –2 INPUT LEVEL (dB) Figure 12. SNR, THD vs. Input Level AD7693 65536 –80 –85 –90 –95 –100 –105 –110 –115 –120 –125 –130 0 ...
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... AD7693 100 SNR, SINAD ENOB 91 90 2.0 2.5 3.0 3.5 4.0 REFERENCE VOLTAGE (V) Figure 13. SNR, SINAD, and ENOB vs. Reference Voltage 100 SNR, SINAD ENOB 91 90 –55 –35 – TEMPERATURE (°C) Figure 14. SNR, SINAD, and ENOB vs. Temperature 100 ...
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... TEMPERATURE (°C) Figure 22. Power-Down Currents vs. Temperature ZERO ERROR GAIN ERROR –35 – TEMPERATURE (°C) VDD = 5V, 85°C VDD = 5V, 25° 100 SDO CAPACITIVE LOAD (pF) Delay vs. Capacitance Load and Supply DSDO AD7693 125 105 125 120 ...
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... The AD7693 provides the user with an on-chip track-and-hold and does not exhibit pipeline delay or latency, making it ideal for multiple multiplexed channel applications. The AD7693 is specified from 4 5.5 V and can be interfaced to any 1 digital logic family housed in a 10-lead MSOP or a tiny 10-lead QFN (LFCSP) that combines space savings and allows flexible configurations ...
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... Transfer Functions The ideal transfer characteristic for the AD7693 is shown in Figure 26 and Table 7. 011...111 011...110 011...101 100...010 100...001 100...000 –FSR –FSR + 1LSB –FSR + 0.5LSB +FSR – 1.5LSB ANALOG INPUT Figure 26. ADC Ideal Transfer Function V+ V+ ...
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... AD7693. The noise coming from the driver is filtered by the AD7693 analog input circuit’s 1-pole, low-pass filter made by R external filter, if one is used. Because the typical noise of the AD7693 is 56 μV rms, the SNR degradation due to the amplifier is SNR 1000 ...
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... REF and GND pins. POWER SUPPLY The AD7693 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 VDD. To reduce the supplies needed, the VIO and VDD pins can be tied together ...
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... However, due to the possibility of performance degradation, digital activity should only occur during the first quarter of the conversion phase because the AD7693 provides error correction circuitry that can correct for an incorrect bit during this time. The user should initiate the busy indicator if desired during this time ...
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... CS MODE, 3-WIRE WITHOUT BUSY INDICATOR This mode is usually used when a single AD7693 is connected to an SPI-compatible digital host. The connection diagram is shown in Figure 34, and the corresponding timing is given in Figure 35. 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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... AD7693 CS MODE, 3-WIRE WITH BUSY INDICATOR This mode is usually used when a single AD7693 is connected to an SPI-compatible digital host having an interrupt input. The connection diagram is shown in Figure 36, and the corresponding timing is given in Figure 37. 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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... SCK falling edge will allow a faster reading rate, provided it has an acceptable hold time. After the th 16 SCK falling edge or when SDI goes high (whichever occurs first), SDO returns to high impedance and another AD7693 can be read. CNV CNV AD7693 ...
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... AD7693 CS MODE, 4-WIRE WITH BUSY INDICATOR This mode is usually used when a single AD7693 is connected to an SPI-compatible digital host with an interrupt input and 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 AD7693s 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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... D C completed their conversions, the SDO pin of the ADC closest to the digital host (see the AD7693 ADC labeled C in Figure 44) is driven high. This transition on SDO can be used as a busy indicator to trigger the data readback controlled by the digital host. The AD7693 then enters the acquisition phase and powers down ...
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... The pinout of the AD7693, 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 AD7693 is used as a shield ...
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... ORDERING GUIDE Model 1 Notes Temperature Range AD7693BCPZRL −40°C to +85°C AD7693BCPZRL7 −40°C to +85°C AD7693BRMZ −40°C to +85°C AD7693BRMZRL7 −40°C to +85°C EVAL-AD7693CBZ 2 3 EVAL-CONTROL BRD2 3 EVAL-CONTROL BRD3 RoHS Compliant Part. 2 This board can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL BRDx for evaluation/demonstration purposes. ...