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AD8610BR Datasheet(PDF) 16 Page - Analog Devices |
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AD8610BR Datasheet(HTML) 16 Page - Analog Devices |
16 / 20 page REV. D –16– 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 applications, such as balanced lines, that require differential drivers. The circuit of Figure 30 is a unique line driver widely used in industrial applica- tions. With ±13 V supplies, the line driver can deliver a differential signal of 23 V p-p into a 1 k Ω 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 transformerless, balanced transmission system 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, inverting, or differential operation. 3 2 V– 3 2 V– V+ 5 6 1k R8 V+ R10 50 1/2 OF AD8620 R1 1k 1k R9 1k R4 1k R3 AD8610 1/2 OF AD8620 6 R2 1k 7 U3 U2 R13 1k R5 1k R6 10k R7 1k R12 1k R11 50 VO2 VO1 V– V+ 0 1 VO2 – VO1 = VIN 0 Figure 30. Differential Driver |
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