AD8132 Analog Devices, AD8132 Datasheet
AD8132
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AD8132 Summary of contents
Page 1
... ADCs. Fast overload recovery preserves sampling accuracy. The AD8132 can also be used as a differential driver for the transmission of high-speed signals over low-cost twisted pair or coaxial cables. The feedback network can be adjusted to boost the high-frequency components of the signal ...
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... AD8132–SPECIFICATIONS otherwise noted. For 200 L,dm specifications refer to single-ended input and differential outputs unless otherwise noted.) P arameter D to OUT Specifications IN DYNAMIC PERFORMANCE –3 dB Large Signal Bandwidth –3 dB Small Signal Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time Overdrive Recovery Time ...
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... V 0.5 –66 0.985 1 1.015 2.7 11 9.4 10 –70 –60 +85 –40 AD8132 unless Unit MHz MHz MHz MHz MHz MHz V/µ dBc dBc dBc dBc dBc dBc dBc dBm nV/√Hz pA/√Hz % Degree mV µV/°C µ ...
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... AD8132–SPECIFICATIONS otherwise noted. For 200 L,dm specifications refer to single-ended input and differential outputs unless otherwise noted.) P arameter D to OUT Specifications IN DYNAMIC PERFORMANCE –3 dB Large Signal Bandwidth –3 dB Small Signal Bandwidth Bandwidth for 0.1 dB Flatness NOISE/HARMONIC PERFORMANCE Second Harmonic Third Harmonic ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD8132 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... AD8132 –Typical Performance Characteristics CF 348 348 49.9 0.1 F 499 348 24.9 348 0.0 –0 –0.2 –0 SHOWN –0 0.2V p-p O, 499 L,dm –0 100 1k FREQUENCY – MHz 3 + –40 C –1 – – p-p O, 499 –4 ...
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... FREQUENCY – MHz 49 348 , R = 249 (R = 498 ) L, 1000 , R = 499 , R = 100 200 ) L,dm AD8132 6.1 6.0 5.9 5.8 5 3V 0.2V p-p O, 200 L,dm 5 100 1k FREQUENCY – MHz R F 499 49.9 0.1 F 200 499 24 – – ...
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... AD8132 LPF – 800 L, p-p OUT,dm –50 HD3 (V = 3V) S –60 HD2 (V = 3V) –70 S –80 HD2 (V = 5V) S –90 –100 HD3 (V = 5V) S –110 FREQUENCY – MHz – 800 L,dm –50 HD3 (F = 20MHz) –60 –70 HD2 (F = 20MHz) –80 HD2 (F = 5MHz) – ...
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... HD3 (V = 5V) S –60 –70 –80 HD2 (V = 5V) S –90 –100 FREQUENCY – MHz AD8132 HD3 (F = 20MHz) HD2 (F = 20MHz) HD3 (F = 5MHz) 700 800 900 1000 R – LOAD HPF Ω – HD3 (F = 20MHz 800 –50 L,dm –60 –70 HD2 (F = 20MHz) – ...
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... AD8132 – HD3 (F = 20MHz 800 L,dm –50 HD2 (F = 20MHz) –60 –70 –80 –90 HD3 (F = 5MHz) –100 HD2 (F = 5MHz) –110 DIFFERENTIAL OUTPUT VOLTAGE – 20MHz 800 –10 L,dm –20 –30 –40 –50 –60 –70 –80 – ...
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... 40mV 5ns OUT,dm V OUT– V OUT+ V +DIN 1V 5ns C = 0pF 5pF 20pF L 5ns 400mV AD8132 300mV 5ns p-p O, 499 L,dm 2mV 5ns 5ns/DIV 0 V OUT,dm –PSRR – –20 ...
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... AD8132 348 348 249 V OUT,dm V OUT, cm 49.9 348 249 348 NOTE: RESISTORS MATCHED TO 0.01 –1V TO +1V OCM V OUT,cm 400mV 5ns 1000 100 10 1.8pA 100 1k 10k 100k 1M 10M 100M FREQUENCY – Hz – p-p IN,cm –30 –40 V OUT,cm V IN,cm –50 –60 V OUT,dm –70 ...
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... R equal-value gain resistors This circuit is diagrammed in G Figure 3. Like a conventional op amp, the AD8132 has two differential inputs that can be driven with both a differential-mode input voltage and a common-mode input voltage, V IN,dm There is another input, V ...
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... Offset voltages are assumed to be zero. While it is possible to operate the AD8132 with a purely differ- ential input, many of its applications call for a circuit that has a single-ended input with a differential output. ...
Page 15
... In this case, however, the positive input and negative output are used for the feedback network. Since a conventional op amp does not have a negative output, only its inverting input can be used for the feedback network. The AD8132 is symmetrical, so the feedback network on either side can be used to produce the same results. ...
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... PCB design. The first requirement is a good solid ground plane that covers as much of the board area around the AD8132 as possible. The only exception to this is that the two input pins (Pins 1 and 8) should be kept a few mm from the ground plane, and ground should be removed from inner layers and the opposite side of the board under the input pins ...
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... The AD8132 con- veniently performs these functions when driving the AD9203, a 10-bit, 40 MSPS A/D converter. In Figure p-p signal drives the input of an AD8132 configured for unity gain. Both the AD8132 and the AD9203 are powered from a single 3 V supply. A voltage divider biases ...
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... V Changing the connection to V OUT common-mode from low impedance to high impedance actively set to a particular voltage, the AD8132 will try OCM to force V OUT,cm impedance. All the previous analysis assumed that this output impedance is arbitrarily low enough to drive the load condition in the circuit. However, the are some applications that benefi ...
Page 19
... Such circuits are useful for measuring ac voltages and other computational tasks. Figure 19 shows the configuration of such a circuit. Each of the AD8132 outputs drives the anode 2835 Schottky diode. These Schottky diodes were chosen for their high-speed opera- tion. At lower frequencies (approximately lower than 10 MHz), a silicon signal diode, like a 1N4148 can be used ...
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... AD8132 The circuit was run at a frequency up to 300 MHz and, while it was still functional, the major harmonic that remained in the output was the second. This made it look like a sine wave at 600 MHz. Figure oscilloscope plot of the output when driven by a 100 MHz, 2.5 V p-p input. ...