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LTC6401-20 Datasheet(PDF) 11 Page - Linear Integrated Systems |
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LTC6401-20 Datasheet(HTML) 11 Page - Linear Integrated Systems |
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11 / 16 page  LTC6401-14 11 640114f FREQUENCY (MHz) 0 –40 –90 –80 –70 –60 –50 –100 –110 20 40 60 80 100 120 140 160 180 640114 F08 200 SINGLE-ENDED INPUT FS = 122.8Msps DRIVER VOUT = 2VP-P COMPOSITE Figure 6. LTC6401-14 Modified 165MHz for Bandpass Filtering (Three External Capacitors, One External Inductor) only a few components as shown in Figure 6. Three 39pF capacitors and a 16nH inductor create a bandpass filter with 165MHz center frequency, –3dB frequencies at 138MHz and 200MHz. Figure 7. Single-Ended Input to LTC6401-14 and LTC2208 Figure 8. IMD3 for the Combination of LTC6401-14 and LTC2208 Output Common Mode Adjustment The LTC6401-14’s output common mode voltage is set by the VOCM pin, which is a high impedance input. The output common mode voltage is capable of tracking VOCM in a range from 1V to 1.6V. Bandwidth of VOCM control is typically 14MHz, which is dominated by a low pass filter connected to the VOCM pin and is aimed to reduce com- mon mode noise generation at the outputs. The internal common mode feedback loop has a –3dB bandwidth around 400MHz, allowing fast rejection of any common mode output voltage disturbance. The VOCM pin should be tied to a DC bias voltage with a 0.1μF bypass capaci- tor. When interfacing with 3V A/D converters such as the LT22xx families, the VOCM pin can be connected to the VCM pin of the ADC. Driving A/D Converters The LTC6401-14 has been specifically designed to interface directly with high speed A/D converters. Figure 7 shows the LTC6401-14 with single-ended input driving the LTC2208, which is a 16-bit, 130Msps ADC. Two external 5Ω resistors help eliminate potential resonance associated with bond wires of either the ADC input or the driver output. VOCM of the LTC6401-14 is connected to VCM of the LTC2208 at 1.25V. Alternatively, an input single-ended signal can be converted to differential signal via a balun and fed to the input of the LTC6401-14. Figure 8 summarizes the IMD3 performance of the whole system as shown in Figure 7. APPLICATIONS INFORMATION 640114 F06 IN+ OUT– IN– OUT+ 200 Ω 12.5 Ω 500 Ω LTC6401-14 LTC2208 200 Ω 500 Ω 12.5 Ω 10 Ω 10 Ω 4.99 Ω 4.99 Ω 50 Ω 50 Ω 13 14 15 16 7 5 6 8 39pF 16nH 39pF +OUT +OUTF –OUTF –OUT +IN +IN –IN –IN 1.7pF 39pF 29 Ω 68.5 Ω 0.1 μF 0.1 μF 640114 F07 LTC6401-14 VOCM ENABLE LTC2208 4.99 Ω 0.1 μF LTC2208 130Msps 16-Bit ADC 1.25V 4.99 Ω 8dB GAIN +OUT +OUTF –OUTF –OUT AIN– AIN+ VCM –IN +IN IF IN |
Similar Part No. - LTC6401-20 |
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Similar Description - LTC6401-20 |
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