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AD8052 Datasheet(PDF) 19 Page - Analog Devices |
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AD8052 Datasheet(HTML) 19 Page - Analog Devices |
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19 / 24 page  AD8051/AD8052/AD8054 Rev. G | Page 19 of 24 AD8051 +5V VREF AVDD SELECT INA-I 10pF CLOCK SLEEP D9 D1 D2 D3 D4 D5 D6 D7 D0 DVDD AVSS REFSENSE AD9201 DVSS CHIP–SELECT INB-I REFT-I REFB-I REFB-Q REFT-Q INB-Q INA-Q D8 DATA OUT 10pF –5V 10pF 10pF 15 16 17 18 19 20 21 22 23 24 25 26 27 28 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0.1µF 10µF +5V +VDD 10µF 0.1µF 0.1µF 0.1µF 10µF 0.1µF 10µF 0.1µF 10µF 0.1µF 0.1µF 0.1µF +5V 22Ω 22Ω 22Ω 22Ω 22Ω 1kΩ 1kΩ 0.33µF 0.01µF 1kΩ 10µF 0.1µF 10µF 0.1µF 50Ω 3 2 7 4 6 Figure 48. The AD8051 Driving an AD9201, a 10-Bit, 20 MSPS A/D Converter The AD9201 has differential inputs for each channel. These are designated the A and B inputs. The B inputs of each channel are connected to VREF (Pin 22), which supplies a positive reference of 2.5 V. Each of the B inputs has a small low-pass filter that also helps to reduce distortion. Figure 49 shows the FFT response of the A/D for the case of a 1 MHz analog input. The SFDR is 71.66 dB, and the A/D is producing 8.8 ENOB (effective number of bits). When the analog frequency was raised to 9.5 MHz, the SFDR was reduced to −60.18 dB and the A/D operated with 8.46 ENOBs as shown in Figure 50. The inclusion of the AD8051 in the circuit did not worsen the distortion performance of the The output of the op amp is ac-coupled into INA-I (Pin 16) via two parallel capacitors to provide good high frequency and low frequency coupling. The 1 kΩ resistor references the signal to VREF that is applied to INB-I. Thus, INA-I swings both positive and negative with respect to the bias voltage applied to INB-I. AD9201. PART# 0 FCLK FUND VIN THD SNR SINAD ENOB SFDR 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH FFTSIZE 8192 20.0MHz 9.5MHz –0.44dB –57.08 54.65 52.69 8.46 60.18 –60.18 –60.23 –82.01 –78.83 –81.28 –77.28 –84.54 –92.78 10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 FREQUENCY (MHz) 0 1 2 3 45 67 8 9 10 FUND 2ND 5TH 6TH 7TH 8TH 4TH 3RD PART# 0 FCLK FUND VIN THD SNR SINAD ENOB SFDR 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH FFTSIZE 8192 20.0MHz 998.5kHz –0.51dB –68.13 54.97 54.76 8.80 71.66 –74.53 –76.06 –76.35 –79.05 –80.36 –75.08 –88.12 –77.87 10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 FREQUENCY (MHz) 0 1 2 3 45 67 8 9 10 FUND 2ND 5TH 6TH 7TH 8TH 9TH 4TH 3RD Figure 50. FFT Plot for AD8051 Driving the AD9201 at 9.5 MHz SYNC STRIPPER Synchronizing pulses are sometimes carried on video signals so as not to require a separate channel to carry the synchronizing information. However, for some functions, such as A/D conversion, it is not desirable to have the sync pulses on the video signal. These pulses reduce the dynamic range of the video signal and do not provide any useful information for such a function. Figure 49. FFT Plot for AD8051 Driving the AD9201 at 1 MHz With the sampling clock running at 20 MSPS, the A/D output was analyzed with a digital analyzer. Two input frequencies were used, 1 MHz and 9.5 MHz, which is just short of the Nyquist frequency. These signals were well filtered to minimize any harmonics. |
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