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LTC2351-12 数据表(PDF) 13 Page - Linear Technology |
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LTC2351-12 数据表(HTML) 13 Page - Linear Technology |
13 / 20 page 13 LTC2351-12 235112f LTC1566-1: Low Noise 2.3MHz Continuous Time Lowpass Filter. LT ®1630: 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 AC applications where rail-to-rail performance is desired. Quad version is available as LT1633. LT1801: 80MHz GBWP, –75dBc at 500kHz, 2mA/ampli- fier, 8.5nV/ √Hz. LT1806/LT1807: 325MHz GBWP, –80dBc distortion at 5MHz, unity gain stable, rail-to-rail in and out, 10mA/amplifier, 3.5nV/ √Hz. LT1810: 180MHz GBWP, –90dBc distortion at 5MHz, unity gain stable, rail-to-rail 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, rail-to-rail in and out, 15mA/amplifier, 0.95nV/ √Hz. LT6203: 100MHz GBWP, –80dBc distortion at 1MHz, unity gain stable, rail-to-rail in and out, 3mA/amplifier, 1.9nV/ √Hz. LT6600: Amplifier/Filter Differential In/Out with 10MHz Cutoff Frequency. source impedance of the driving circuit is low, then the LTC2351-12 inputs can be driven directly. As source impedance increases, so will acquisition time. For mini- mum 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 (the time allowed for settling must be at least 39ns for full throughput rate). Also keep in mind while choosing 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 voltage spike seen by the amplifier from charging the sampling capacitor, choose an amplifier that has a low output impedance (< 100 Ω) at the closed-loop bandwidth frequency. For example, if an amplifier is used in 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 LTC2351-12 depends on the application. Generally, applications fall into two catego- ries: 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 LTC2351-12. (More detailed information is available in the Linear Technology Databooks and on the website at www.linear.com.) APPLICATIO S I FOR ATIO LinearView is a trademark of Linear Technology Corporation. |
类似零件编号 - LTC2351-12 |
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类似说明 - LTC2351-12 |
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