EVAL-AD7622CBZ Analog Devices Inc, EVAL-AD7622CBZ Datasheet
EVAL-AD7622CBZ
Specifications of EVAL-AD7622CBZ
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EVAL-AD7622CBZ Summary of contents
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FEATURES Throughput 2 MSPS (wideband warp and warp mode) 1.5 MSPS (normal mode) INL: ±0.5 LSB typical, ±1.5 LSB maximum (±23 ppm of FSR) 16-bit resolution with no missing codes Dynamic range: 92.5 dB typical SINAD minimum @ ...
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... Initial Version Multiplexed Inputs ..................................................................... 17 Driver Amplifier Choice ........................................................... 18 Voltage Reference Input ............................................................ 19 Power Supply............................................................................... 20 Conversion Control ................................................................... 20 Interfaces.......................................................................................... 21 Digital Interface.......................................................................... 21 Parallel Interface......................................................................... 21 Serial interface ............................................................................ 22 Master Serial Interface............................................................... 22 Slave Serial Interface .................................................................. 24 Microprocessor Interfacing....................................................... 26 Application Hints ........................................................................... 27 Layout .......................................................................................... 27 Evaluating the AD7622 Performance ...................................... 27 Outline Dimensions ....................................................................... 28 Ordering Guide .......................................................................... 28 Rev Page ...
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SPECIFICATIONS AVDD = DVDD = 2.5 V; OVDD = 2 3 Table 2. Parameter RESOLUTION ANALOG INPUT Voltage Range Operating Input Voltage Analog Input CMRR Input Current 2 Input Impedance THROUGHPUT SPEED Complete Cycle Throughput Rate ...
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AD7622 Parameter REFBUFIN Output Voltage REFBUFIN Output Resistance EXTERNAL REFERENCE Voltage Range Current Drain REFERENCE BUFFER REFBUFIN Input Voltage Range REFBUFIN Input Current TEMPERATURE PIN Voltage Output Temperature Sensitivity Output Resistance DIGITAL INPUTS Logic Levels ...
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TIMING SPECIFICATIONS AVDD = DVDD = 2.5 V; OVDD = 2 3 Table 3. Parameter CONVERSION AND RESET (Refer to Figure 31 and Figure 32) Convert Pulse Width Time Between Conversions (Warp Mode CNVST Low to ...
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AD7622 1 See the Conversion Control section. 2 All timings for wideband warp mode are the same as warp mode warp mode only, the maximum time between conversions is 1 ms; otherwise, there is no required maximum time. ...
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ABSOLUTE MAXIMUM RATINGS Table 5. Parameter Analog Inputs/Outputs 1 IN+ , IN−, REF, REFBUFIN, TEMP, INGND, REFGND to AGND Ground Voltage Differences AGND, DGND, OGND Supply Voltages AVDD, DVDD OVDD AVDD to DVDD AVDD, DVDD to OVDD Digital Inputs 2 ...
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AD7622 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 6. Pin Function Descriptions Pin No. Mnemonic Type 1 Description 1, 36, AGND P Analog Power Ground. 41 AVDD P Input Analog Power Pins. Nominally 2 DGND P ...
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Pin 1 No. Mnemonic Type Description 14 D5 DI/O When SER/PAR = low, this output is used as Bit 5 of the parallel port data output bus. or INVSYNC When SER/PAR = high, invert sync select. In serial master mode ...
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AD7622 Pin 1 No. Mnemonic Type Description Read Data. When CS and RD are both low, the interface parallel or serial output bus is enabled Chip Select. When CS and RD are both low, ...
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TERMINOLOGY Integral Nonlinearity Error (INL) Linearity error 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 LSB before the first ...
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AD7622 TYPICAL PERFORMANCE CHARACTERISTICS 1.50 1.00 0.50 0 –0.50 –1.00 –1.50 0 16384 32768 CODE Figure 6. Integral Nonlinearity vs. Code 250000 196433 200000 150000 100000 50000 27695 7FF8 7FF9 7FFA 7FFB 7FFC 7FFD 7FFE 7FFF ...
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SNR = 92dB –40 THD = –117dB SFDR = 103dB –60 SINAD = 92dB –80 –100 –120 –140 –160 –180 0 100 200 300 400 500 600 700 FREQUENCY (kHz) Figure 12. FFT 20 kHz 95 ...
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AD7622 93.0 SNR 92.5 SINAD 92.0 91.5 91.0 –60 –50 –40 –30 INPUT LEVEL (dB) Figure 18. SNR and SINAD vs. Input Level (Referred to Full Scale –55 –35 –15 5 ...
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APPLICATIONS INFORMATION IN+ MSB 32,768C 16,384C REF REFGND 32,768C 16,384C MSB IN– CIRCUIT INFORMATION The AD7622 is a very fast, low power, single-supply, precise 16-bit ADC using successive approximation architecture. The AD7622 features different modes to optimize performances according to ...
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AD7622 TRANSFER FUNCTIONS Using the OB/ 2C digital input, the AD7622 offers two output codings: straight binary and twos complement. The LSB size with V = 2.048 × 65536 which is 62.5 μV. Refer to ...
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TYPICAL CONNECTION DIAGRAM Figure 24 shows a typical connection diagram for the AD7622. Different circuitry shown in this diagram is optional and is discussed in the following sections. ANALOG INPUTS Figure 25 shows an equivalent circuit of the input structure ...
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AD7622 DRIVER AMPLIFIER CHOICE Although the AD7622 is easy to drive, the driver amplifier needs to meet the following requirements: • For multichannel, multiplexed applications, the driver amplifier and the AD7622 analog input circuit must be able to settle for ...
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VOLTAGE REFERENCE INPUT The AD7622 allows the choice of either a very low temperature drift internal voltage reference, an external 1.2 V reference that can be buffered using the internal reference buffer external reference. Unlike many ADCs with ...
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AD7622 Temperature Sensor The TEMP pin measures the temperature of the AD7622. To improve the calibration accuracy over the temperature range, the output of the TEMP pin is applied to one of the inputs of the analog switch (such as, ...
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INTERFACES DIGITAL INTERFACE The AD7622 has a versatile digital interface that can be set up as either a serial or a parallel interface with the host system. The serial interface is multiplexed on the parallel data bus. The AD7622 digital ...
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AD7622 8-Bit Interface (Master or Slave) The BYTESWAP pin allows a glueless interface to an 8-bit bus. As shown in Figure 36, when BYTESWAP is low, the LSB byte is output on D[7:0] and the MSB is output on D[15:8]. ...
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EXT/INT = 0 CS CNVST BUSY t 29 SYNC SCLK t 15 SDOUT D15 Figure 37. Master Serial Data Timing for Reading (Read After Convert) EXT/INT = 0 ...
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AD7622 SLAVE SERIAL INTERFACE External Clock The AD7622 is configured to accept an externally supplied serial data clock on the SCLK pin when the EXT/ INT pin is held high. In this mode, several methods can be used to read ...
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EXT/INT = 1 CS BUSY SCLK D15 D14 SDOUT SDIN X15 X14 t 33 Figure 40. Slave Serial Data Timing for Reading ...
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AD7622 MICROPROCESSOR INTERFACING The AD7622 is ideally suited for traditional dc measurement applications supporting a microprocessor, and ac signal processing applications interfacing to a digital signal processor. The AD7622 is designed to interface with a parallel 8-bit or 16-bit wide ...
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... EVALUATING THE AD7622 PERFORMANCE A recommended layout for the AD7622 is outlined in the documentation of the EVAL-AD7622-CB evaluation board for the AD7622. The evaluation board package includes a fully assembled and tested evaluation board, documentation, and software for controlling the board from a PC via the CONTROL BRD3 ...
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... This board can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL BRD3 for evaluation/demonstration purposes. 3 This board allows control and communicate with all Analog Devices, Inc. evaluation boards ending in the CB designators. ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners ...