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LTC1565-31CS8 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1565-31CS8 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LTC1565-31 APPLICATIONS INFORMATION Output Drive Pin 7 and Pin 8 can drive a 1k Ω or 300pF load connected to AC ground with a ±0.5V signal (corresponding to a 2VP-P differential signal). For differential loads (loads connected from Pin 7 to Pin 8) the outputs can produce a 2VP-P differential signal across 2kΩ or 150pF. For smaller signal amplitudes the outputs can drive corre- spondingly larger loads. Noise The wideband noise of the filter is the RMS value of the device’s output noise spectral density. The wideband noise data is used to determine the operating signal-to- noise at a given distortion level. Most of the noise is concentrated in the filter passband and cannot be removed with post filtering (Table 1). Table 2 lists the typical change in wideband noise with supply voltage. Table 1. Wideband Noise vs Bandwidth, Single 5V Supply BANDWIDTH TOTAL INTEGRATED NOISE DC to fCUTOFF 104 µVRMS DC to 2 • fCUTOFF 118 µVRMS Table 2. Wideband Noise vs Supply Voltage, fCUTOFF = 650kHz TOTAL INTEGRATED NOISE POWER SUPPLY DC TO 2 • fCUTOFF 5V 118 µVRMS ±5V 120 µVRMS TYPICAL APPLICATIO S + – A1 LT ®1809 4 6 0.1 µF 10 µF 2.49k 7 5V 2 3 4.99k 4.99k A3 LT1809 4 6 0.1 µF 2.49k 7 5V 2 3 4.99k 4.99k A2 LT1809 4 6 0.1 µF +VIN/2 + VCM –VIN/2 + VCM 0.1 µF 0.1 µF 5V +IN –IN GND V– +OUT –OUT LTC1565-31 V+ SHDN 1 2 3 4 8 7 6 5 10 µF 4.99k 2.49k VCM VIN 7 5V 2 3 4.99k 2.49k A4 LT1809 4 6 0.1 µF VOUT (SINGLE ENDED) 2.49k 2.49k 7 5V 2 3 4.99k 4.99k A5 LT1812 4 6 0.1 µF 0.1 µF V+/2 2.2 µF 19k 0.01 µF 7 2 3 1k 5V 20 Ω 1k AMPLIFIERS A1, A2 AND A3 ALLOW THE USE OF A GROUND- REFERENCED SINGLE-ENDED AC SOURCE AS THE INPUT SIGNAL AND A SEPARATE GROUND-REFERENCED DC SOURCE TO PROVIDE THE INPUT DC COMMON MODE VOLTAGE AMPLIFIERS A4 AND A5 ALLOW MONITORING/MEASURING THE DIFFERENTIAL OUTPUT WITH A SINGLE-ENDED, GROUND- REFERENCED INSTRUMENT 1565-31 TA08 Test Circuit for Single 5V Supply Operation |
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