AD7450ARMZ Analog Devices Inc, AD7450ARMZ Datasheet
AD7450ARMZ
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AD7450ARMZ Summary of contents
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FEATURES Fast Throughput Rate: 1 MSPS Specified for and Low Power at Max Throughput Rate: 3.75 mW Max at 833 kSPS with 3 V Supplies 9 mW Max at 1 MSPS with ...
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AD7450–SPECIFICATIONS MHz SCLK S Parameter DYNAMIC PERFORMANCE Signal-to-(Noise + Distortion) Ratio 3 (SINAD) 3 Total Harmonic Distortion (THD) 3 Peak Harmonic or Spurious Noise 3 Intermodulation Distortion (IMD) ...
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Parameter Conditions/Comments CONVERSION RATE Conversion Time 888 ns with an 18 MHz SCLK 1.07 µs with a 15 MHz SCLK Track-and-Hold Sine Wave Input 3, 8 Acquisition Time 9 Throughput Rate V V POWER REQUIREMENTS Range ± 10%; ...
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AD7450 1, 2 TIMING SPECIFICATIONS MHz MSPS 2 SCLK S REF Limit MIN MAX Parameter SCLK 15 18 ...
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ABSOLUTE MAXIMUM RATINGS (T = 25°C, unless otherwise noted GND . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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AD7450 Pin Number Mnemonic 1 V REF IN– 4 GND SDATA 7 SCLK PIN CONFIGURATION REF AD7450 V SCLK 2 7 IN+ TOP VIEW ...
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TERMINOLOGY Signal-to-(Noise + Distortion) Ratio This is the measured ratio of signal-to-(noise + distortion) at the output of the ADC. The signal is the rms amplitude of the fundamental. Noise is the sum of all nonfundamental signals up to half ...
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AD7450–Typical Performance Characteristics (Default Conditions 8192 POINT FFT f = 1MSPS SAMPLE – 300kHz IN SINAD = 71.7dB THD = –82.8dB –40 PK NOISE = –85.3dB –60 –80 –100 –120 0 50 ...
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POSITIVE INL 0.5 0 –0.5 NEGATIVE INL –1.0 –1.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 V REF TPC 10. Change in INL vs. Reference Voltage 10,000 10,000 9,000 CODES 8,000 V ...
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AD7450 CIRCUIT INFORMATION The AD7450 is a fast, low power, single-supply, 12-bit successive approximation analog-to-digital converter (ADC). It can operate with and 3 V power supply and is capable of throughput rates MSPS and ...
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p-p CM* V REF IN+ AD7450 SDATA V p-p CM* V REF IN– V REF 1.25V/2.5V V REF 0.1 F *CM = COMMON-MODE VOLTAGE Figure 6. Typical Connection Diagram THE ANALOG INPUT The ...
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AD7450 REFERENCE = 1.25V V IN COMMON-MODE (CM 0.625V MIN CM = 4.42V V MAX IN REFERENCE = 2. COMMON-MODE (CM 1.25V MIN CM = 3.75V MAX V IN Figure 10. Examples of the ...
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GND –2.5V *MOUNT AS CLOSE TO THE AD7450 AS POSSIBLE AND ENSURE HIGH PRECISION Rs AND Cs ARE USED Rs – 50R; C – 1nF; Rg1 = Rf1 = Rf2 = 499R; Rg2 = 523R Figure 14. Using the ...
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AD7450 The circuit configuration shown in Figure 15b converts a unipolar, single-ended signal into a differential signal. 220 2 V p-p REF V+ 390 VREF GND V– 220 220 V+ A V– 10k Figure 15b. Dual Op Amp Circuit to ...
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SINGLE-ENDED OPERATION When supplied with power supply, the AD7450 can handle a single-ended input. The design of this part is optimized for differential operation, so with a single-ended input, performance will degrade. Linearity will typically degrade by ...
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AD7450 SCLK SDATA LEADING ZEROS 10ns SCLK 1 2 MODES OF OPERATION The mode of operation of the AD7450 is selected by controlling the logic state ...
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SCLK SDATA Figure 22. Entering Power-Down Mode Once CS has been brought high in this window of SCLKs, the part will enter power-down, the conversion that was initiated by the falling edge of CS will be terminated, ...
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AD7450 POWER VERSUS THROUGHPUT RATE By using the power-down mode on the AD7450 when not converting, the average power consumption of the ADC decreases at lower throughput rates. Figure 24 shows how, as the throughput rate is reduced, the device ...
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AD7450 to TMS320C5x/C54x The serial interface on the TMS320C5x/C54x uses a continuous serial clock and frame synchronization signals to synchronize the data transfer operations with peripheral devices, such as the AD7450. The CS input allows easy interfacing between the TMS320C5x/C54x ...
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AD7450 EVALUATING THE AD7450 PERFORMANCE The evaluation board package includes a fully assembled and tested evaluation board, documentation, and software for controlling the board from a PC via the Evaluation Board Controller. The Evaluation Board Controller can be used in ...