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LTC1403ACMSE-1 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1403ACMSE-1 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  10 LTC1403-1/LTC1403A-1 14031f DRIVING THE ANALOG INPUT The differential analog inputs of the LTC1403-1/LTC1403A-1 are easy to drive. The inputs may be driven differentially or as a single-ended input (i.e., the AIN– input is set to VCM). Both differential analog inputs, AIN+ with AIN–, are sampled at the same instant. Any unwanted signal that is common to both inputsofeachinputpairwillbereducedbythecommonmode rejectionofthesample-and-holdcircuit.Theinputsdrawonly one small current spike while charging the sample-and-hold capacitors at the end of conversion. During conversion, the analog inputs draw only a small leakage current. If the source impedance of the driving circuit is low, then the LTC1403-1/ LTC1403A-1 inputs can be driven directly. As source imped- ance increases, so will acquisition time. For minimum acqui- sition time with high source impedance, a buffer amplifier must be used. The main requirement is that the amplifier driving the analog input(s) must settle after the small current spike before the next conversion starts (settling time must be 39ns for full throughput rate). Also keep in mind while choosing an input amplifier, the amount of noise and har- monic distortion added by the amplifier. CHOOSING AN INPUT AMPLIFIER Choosing an input amplifier is easy if a few requirements are taken into consideration. First, to limit the magnitude of the voltage spike seen by the amplifier from charging the sam- pling capacitor, choose an amplifier that has a low output impedance(<100 Ω)attheclosed-loopbandwidthfrequency. For example, if an amplifier is used with a gain of 1 and has a unity-gain bandwidth of 50MHz, then the output impedance at 50MHz must be less than 100 Ω. The second requirement is that the closed-loop bandwidth must be greater than 40MHz to ensure adequate small-signal settling for full throughput rate. If slower op amps are used, more time for settling can be provided by increasing the time between conversions. The best choice for an op amp to drive the LTC1403-1/LTC1403A-1willdependontheapplication.Gen- erally, applications fall into two categories: AC applications where dynamic specifications are most critical and time domain applications where DC accuracy and settling time are most critical. The following list is a summary of the op amps that are suitable for driving the LTC1403-1/LTC1403A-1. (More detailed information is available in the Linear Technol- ogy Databooks and our website at www.linear.com.) LTC ®1566-1: Low Noise 2.3MHz Continuous Time Low- Pass Filter. LT1630:Dual 30MHz Rail-to-Rail Voltage FB Amplifier. 2.7V to ±15V supplies. Very high AVOL, 500µV offset and 520ns settling to 0.5LSB for a 4V swing. THD and noise are –93dB to 40kHz and below 1LSB to 320kHz (AV=1,2VP-Pinto1kΩ, VS = 5V), making the part excellent for AC applications (to 1/3 Nyquist) where rail-to-rail performance is desired. Quad version is available as LT1631. LT1632:Dual 45MHz Rail-to-Rail Voltage FB Amplifier. 2.7V to ±15V supplies. Very high AVOL, 1.5mV offset and 400ns settling to 0.5LSB for a 4V swing. It is suitable for applica- tions with a single 5V supply. THD and noise are –93dB to 40kHz and below 1LSB to 800kHz (AV = 1, 2VP-P into 1kΩ, VS = 5V), making the part excellent for AC applications where rail-to-rail performance is desired. Quad version is available as LT1633. LT1813: Dual 100MHz 750V/ µs 3mA Voltage Feedback Amplifier. 5V to ±5V supplies. Distortion is –86dB to 100kHz and –77dB to 1MHz with ±5V supplies (2VP-P into 500Ω). Excellent part for fast AC applications with ±5V supplies. LT1801: 80MHz GBWP, –75dBc at 500kHz, 2mA/Amplifier, 8.5nV/ √Hz. LT1806/LT1807:325MHzGBWP,–80dBcDistortionat5MHz, Unity-GainStable,R-RInandOut,10mA/Amplifier,3.5nV/ √Hz. LT1810: 180MHz GBWP, –90dBc Distortion at 5MHz, Unity-GainStable,R-RInandOut,15mA/Amplifier,16nV/ √Hz. LT1818/LT1819: 400MHz, 2500V/ µs,9mA,Single/DualVolt- age Mode Operational Amplifier. LT6200: 165MHz GBWP, –85dBc Distortion at 1MHz, Unity- Gain Stable, R-R In and Out, 15mA/Amplifier, 0.95nV/ √Hz. LT6203: 100MHz GBWP, –80dBc Distortion at 1MHz, Unity-Gain Stable, R-R In and Out, 3mA/Amplifier, 1.9nV/ √Hz. LT6600-10: Amplifier/Filter Differential In/Out with 10MHz Cutoff. APPLICATIO S I FOR ATIO |
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