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AD8620 датащи(PDF) 21 Page - Analog Devices |
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AD8620 датащи(HTML) 21 Page - Analog Devices |
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21 / 24 page ![]() AD8610/AD8620 High Speed, Low Noise Differential Driver The AD8620 is a perfect candidate as a low noise differential driver for many popular ADCs. There are also other applica tions (such as balanced lines) that require differential drivers. The circuit of Figure 70 is a unique line driver widely used in industrial applications. With ±13 V supplies, the line driver can deliver a differential signal of 23 V p-p into a 1 kΩ load. The high slew rate and wide bandwidth of the AD8620 combine to yield a full power bandwidth of 145 kHz while the low noise front end produces a referred-to-input noise voltage spectral density of 6 nV/√Hz. The design is a balanced transmission system without transformers, where output common-mode rejection of noise is of paramount importance. Like the transformer-based design, either output can be shorted to ground for unbalanced line driver applications without changing the circuit gain of 1. This allows the design to be easily set to noninverting, invert ing, or differential operation. VO1 VO2 3 2 V– 3 2 V– V+ 5 6 V+ 1/2 AD8620 U2 AD8610 1/2 AD8620 U3 6 7 0 1 0 R3 1kΩ R4 1kΩ R13 1kΩ R5 1kΩ R6 10kΩ R7 1kΩ R1 1kΩ R12 1kΩ R2 1kΩ R10 50Ω R11 50Ω R8 1kΩ R9 1kΩ VO2 – VO1 = VIN V– V+ Figure 70. Differential Driver Rev. E | Page 21 of 24 |
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