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THS4221 Datasheet(PDF) 17 Page - Texas Instruments |
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THS4221 Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 40 page  THS4221, THS4225 THS4222, THS4226 SLOS399G − AUGUST 2002 − REVISED JANUARY 2004 www.ti.com 17 APPLICATION CIRCUITS Driving an Analog-to-Digital Converter With the THS4222 The THS4222 can be used to drive high-performance analog-to-digital converters. Two example circuits are presented below. The first circuit uses a wideband transformer to convert a single-ended input signal into a differential signal. The differential signal is then amplified and filtered by two THS4222 amplifiers. This circuit provides low intermodulation distortion, suppressed even-order distortion, 14 dB of voltage gain, a 50-Ω input impedance, and a single-pole filter at 25 MHz. For applications without signal content at dc, this method of driving ADCs can be very useful. Where dc information content is required, the THS4500 family of fully differential amplifiers may be applicable. _ + THS4222 50 Ω Source 1.3 kΩ _ + THS4222 −5 V 649 Ω 4.7 pF 1.3 kΩ 649 Ω 24.9 Ω 4.7 pF 12-Bit, 53 Msps ADS807 (1:4 Ω) 1:2 5 V 24.9 Ω 237 Ω Figure 32. A Linear, Low Noise, High Gain ADC Preamplifier The second circuit depicts single-ended ADC drive. While not recommended for optimum performance using converters with differential inputs, satisfactory performance can sometimes be achieved with single-ended input drive. An example circuit is shown here for reference. _ + THS4222 1.3 kΩ ADS807 12-Bit, 53 Msps Rf +5 V 1.3 kΩ 49.9 Ω VI Rg −5 V 50 Ω Source RISO 0.1 µF 16.5 Ω 68 pf 0.1 µF IN IN CM 1.82 kΩ RT NOTE: For best performance, high-speed ADCs should be driven differentially. See the THS4500 family of devices for more information. Figure 33. Driving an ADC With a Single-Ended Input Active Filtering With the THS4222 High-frequency active filtering with the THS4222 is achievable due to the amplifier’s high slew rate, wide bandwidth, and voltage feedback architecture. Several options are available for high-pass, low-pass, bandpass, and bandstop filters of varying orders. A simple two-pole low pass filter is presented here as an example, with two poles at about 25 MHz. _ + THS4222 49.9 Ω 50 Ω Source 1.3 kΩ 4.7 pF 5 V −5 V 120 pF VO 1.3 kΩ 52.3 Ω VI Figure 34. A Two-Pole Active Filter With Two Poles at about 25 MHz |
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