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LTC1864 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1864 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 22 page  LTC1403-1/LTC1403A-1 11 14031fc APPLICATIONS INFORMATION DRIVING THE ANALOG INPUT ThedifferentialanaloginputsoftheLTC1403-1/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). Bothdifferentialanaloginputs,AIN+withAIN–,aresampled at the same instant. Any unwanted signal that is common to both inputs of each input pair will be reduced by the common mode rejection of the sample-and-hold circuit. Theinputsdrawonlyonesmallcurrentspikewhilecharging 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 impedance increases, so will acquisition time. For minimum acquisition 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 choos- ing an input amplifier, the amount of noise and harmonic 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 voltagespikeseenbytheamplifierfromchargingthesampling capacitor, choose an amplifier that has a low output imped- ance (<100Ω) at the closed-loop bandwidth frequency. For example, if an amplifier is used with a gain of 1 and has a unity-gainbandwidthof50MHz,thentheoutputimpedance at 50MHz must be less than 100Ω. The second require- ment 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-1 will depend on the ap- plication. Generally, 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 Technology 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-P into 1kΩ, VS = 5V), making the part excellent for AC applications (to 1/3 Nyquist) where rail-to-rail perfor- mance 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 applications 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 ACapplicationswhererail-to-railperformanceisdesired. 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/Ampli- fier, 8.5nV/√Hz. LT1806/LT1807: 325MHz GBWP, –80dBc Distortion at 5MHz, Unity-Gain Stable, R-R In and Out, 10mA/Ampli- fier, 3.5nV/√Hz. LT1810: 180MHz GBWP, –90dBc Distortion at 5MHz, Unity-Gain Stable, R-R In and Out, 15mA/Amplifier, 16nV/√Hz. LT1818/LT1819: 400MHz, 2500V/µs,9mA, Single/Dual Voltage 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/FilterDifferentialIn/Outwith10MHz Cutoff. |
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