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LTC1419CG Datasheet(PDF) 10 Page - Linear Technology |
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LTC1419CG Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  10 LTC1419 1419fb that the amplifier driving the analog input(s) must settle after the small current spike before the next conversion starts (settling time must be 200ns for full throughput rate). APPLICATIONS INFORMATION LT ®1220: 30MHz unity-gain bandwidth voltage feedback amplifier. ±5V to ±15V supplies. Excellent DC specifica- tions. LT1223: 100MHz video current feedback amplifier. ±5V to ±15V supplies, 6mA supply current. Low distortion at frequencies above 400kHz. Low noise. Good for AC applications. LT1227: 140MHz video current feedback amplifier. ±5V to ±15V supplies, 10mA supply current. Lowest distor- tion at frequencies above 400kHz. Low noise. Best for AC applications. LT1229/LT1230: Dual/quad 100MHz current feedback amplifiers. ±2V to ±15V supplies, 6mA supply current each amplifier. Low noise. Good AC specs. LT1360: 50MHz voltage feedback amplifier. ±5V to ±15V supplies, 3.8mA supply current. Good AC and DC specs. LT1363: 70MHz, 1000V/ µs op amps, 6.3mA supply cur- rent. Good AC and DC specs. LT1364/LT1365: Dual and quad 70MHz, 1000V/ µs op amps. 6.3mA supply current per amplifier. Input Filtering The noise and the distortion of the input amplifier and other circuitry must be considered since they will add to the LTC1419 noise and distortion. The small-signal band- width of the sample-and-hold circuit is 20MHz. Any noise or distortion products that are present at the analog inputs will be summed over this entire bandwidth. Noisy input circuitry should be filtered prior to the analog inputs to minimize noise. A simple 1-pole RC filter is sufficient for SOURCE RESISTANCE (k Ω) 0.01 1 1419 F06 0.1 0.01 0.1 110 100 10 Figure 6. tACQ vs Source Resistance 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 band- width 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 should be less than 100 Ω. The second requirement is that the closed-loop bandwidth must be greater than 20MHz to ensure adequate small-signal settling for full throughput rate. If slower op amps are used, more settling time can be provided by increasing the time between conversions. The best choice for an op amp to drive the LTC1419 will depend on the application. Generally applications fall into two categories: AC applications where dynamic specifi- cations 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 LTC1419. More detailed informa- tion is available in the Linear Technology databooks, the LinearView TM CD-ROM and on our web site at www.linear- tech. com. Figure 7. RC Input Filter LTC1419 +AIN –AIN VREF REFCOMP AGND 1419 F07 1 2 3 4 5 10 µF 1000pF 50 Ω ANALOG INPUT LinearView is a trademark of Linear Technology Corporation. |
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