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AD9101AR Arkusz danych(PDF) 7 Page - Analog Devices |
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AD9101AR Arkusz danych(HTML) 7 Page - Analog Devices |
7 / 12 page AD9101 –7– REV. 0 provides a good example. It operates on a single negative supply with the input range from 0 V to –2 V. By connecting Pins 1 and 2 (RTN) to a +0.33 V level, rather than its usual ground connection, a bipolar ±0.25 V input is shifted to 0 V to –2 V at the AD9101’s output (see Figure 3 in the Applications section.) APPLICATIONS Because of its rapid acquisition and low distortion, the AD9101 is useful in a wide range of signal processing. Choosing Between the AD9100 and AD9101 The first obvious difference between the AD9100 and AD9101 is sample rate. Simplistically, any high resolution system (12–16 bits) operating below 25 MSPS will use the AD9100 and 8–12 bit systems operating above 25 MSPS will use the AD9101. There are, however, some subtle characteristics of these high performance track-and-hold amplifiers that create some excep- tions to these guidelines. The typical curve entitled “Dynamic Range vs. Analog Frequency” should be considered when choosing between these two high performance track-and-holds. When speed is critical, the AD9101 should receive strong con- sideration, even in high resolution systems. Using a reduced sig- nal amplitude through the AD9100 greatly reduces slew limiting effects and should also be considered when converting high fre- quency (up to 70 MHz) analog signals with encode rates below 25 MSPS. Sampler for Flash ADC Flash ADCs typically suffer degradation of dynamic range as signal frequency increases. The AD9101 was designed specifi- cally for the purpose of boosting this performance and allowing users to obtain maximum performance with flash ADCs. Figure 3 shows the block diagram and timing relationship for an 8-bit, 125 MSPS converter. CLOCK 1 CLOCK 2 + – 1k 3k 1k 0.33V 0.1µF +5V AD9002 40 Ω AD9101 AC RTN HOLD 3.5 ns 4.5 ns HOLD TRACK HOLD TRACK HOLD 3.5 ns 4.5 ns 3.5 ns CLOCK 2 (AD9002) TRACK TRACK HOLD TRACK 3.6 ns 4.4 ns 3.6 ns 44 ns 3.6 ns CLOCK 1 (AD9101) 1.6 ns Figure 3. AD9101 with 8-Bit, 125 MSPS Flash Figure 4 contrasts performance of the flash converter alone vs. the circuit of Figure 3. Figures 5 and 6 show the block diagrams and dynamic range improvement when the AD9101 is used ahead of an 10-bit, 75 MSPS flash converter. The AD9630 is not required if the input frequency is limited to 40 MHz. –70 –50 –30 1 10 100 –45 –40 –35 –55 –60 –65 MHz WITH AD9101 ENCODE = 125 MSPS WORST HARMONIC SNR W/HARMONICS WITH AD9101 Figure 4. AD9002 Dynamic Range With and Without AD9101 8 ns 8.5 ns 8 ns 8.5 ns 8.5 ns "TRACK" "HOLD" "TRACK" "HOLD" "TRACK" CLOCK 1 8.25 ns 8.25 ns 8.25 ns 8.25 ns 8.25 ns "HOLD" "TRACK" "HOLD" "TRACK" "HOLD" CLOCK 2 AD9101 AD9630 AD9060 27 Ω CLOCK 1 CLOCK 2 2.5 ns Figure 5. AD9101 with 10-Bit, 75 MSPS ADC –70 –50 –30 1 10 100 –45 –40 –35 –55 –60 –65 WITH AD9101 MHz ENCODE = 60 MSPS WITH AD9101 WORST HARMONIC SNR W/ HARMONICS Figure 6. AD9060 Dynamic Performance With and With- out AD9101 |
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