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AD9625BBPZRL-2.5 Datasheet(PDF) 33 Page - Analog Devices |
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AD9625BBPZRL-2.5 Datasheet(HTML) 33 Page - Analog Devices |
33 / 74 page Data Sheet AD9625 Rev. C | Page 31 of 72 Figure 80 uses a 1:2 impedance transformer to provide the 100 Ω input impedance of the ADA4961 with a matched input. The open collector outputs of the ADA4961 are biased through the two 560 nH inductors. The two 0.1 μF capacitors on the outputs decouple the 5 V inductor voltage from the input common-mode voltage of the ADA4961. The two 50 Ω resistors in parallel with the 100 Ω input impedance of the AD9625 provide the 50 Ω load to the ADA4961, whose gain is load dependent. The 2 nH inductors and the 1.5 pF internal capacitance of the AD9625 constitute a 1 GHz low-pass filter to −1 dB. The two 10 Ω isolation resistors suppress any switching currents from the AD9625 sample-and-hold circuitry. The circuit depicted in Figure 80 provides variable gain, isolation, filtering and source matching for the AD9625. By using this circuit with the ADA4961 in a gain of 15 dB (maximum gain) an SNRFS of 55 dB and an SFDR performance of 77 dBc are achieved with a 1 GHz input as shown in Figure 80. 0 –120 –100 –80 –60 –40 –20 FREQUENCY (MHz) 2500MSPS 1003.8MHz AT –1.0dBFS SNR = 53.83dB SFDR = 77.354dBc 0 150 5 23 6 + 300 450 600 750 900 1050 1200 4 Figure 77. Measured Single-Tone Performance of the Circuit Shown in Figure 80 for a 1 GHz Input Signal Using Maximum Gain (15 dB) The two-tone 1 GHz IMD of two 0.55 V p-p signals have an SFDR of greater than 75 dBc, as shown in Figure 78. 0 –120 –100 –80 –60 –40 –20 FREQUENCY (MHz) 2500MSPS fIN1 = 1022.3MHz AT –7.0dBFS fIN2 = 1012.3MHz AT –7.0dBFS SFDR = 75.8dBc 0 150 F2 – F1 F1 + F2 2F2 + F1 2F1 + F2 2F1 – F2 2F2 – F1 300 450 600 750 900 1050 1200 Figure 78. Measured Two-Tone Performance of the Circuit Shown in Figure 80 for a 1 GHz input Signal Using Maximum Gain (15 dB) 10 –25 –20 –15 –10 –5 0 5 10 100 1000 10000 FREQUENCY (MHz) Figure 79. Measured Frequency Response of the AD9625 Interface with ADA4961 Depicted in Figure 80 AD9625 VCM 10Ω 10Ω 50Ω 50Ω 1.5pF 100Ω MARKI BAL-0006GSMG 1:2 + VIN+ VIN– 2nH 2nH 0.1µF 0.1µF 0.1µF 0.1µF 5.0V 0.5nH 5.0V 5.0V 0.5nH DIGITAL INTERFACE ADA4961 50Ω BANDPASS FILTER AC Figure 80. Configuration for Driving the AD9625 with ADA4961 |
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