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LTC1402C Datasheet(PDF) 10 Page - Linear Technology |
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LTC1402C Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  10 LTC1402 APPLICATIONS INFORMATION DRIVING THE ANALOG INPUT The differential analog inputs of the LTC1402 are easy to drive. The inputs may be driven differentially or as a single- ended input (i.e., the AIN– input is grounded). The AIN+ and AIN– inputs are sampled at the same instant. Any unwanted signal that is common to both inputs will be reduced by the common mode rejection of the sample-and-hold circuit. The inputs draw only one small current spike while charg- ing the sample-and-hold capacitors at the end of conver- sion. During conversion, the analog inputs draw only a small leakage current. If the source impedance of the driving circuit is low, then the LTC1402 inputs can be driven directly. As source impedance increases, so will acquisition time (see Figure 1). For minimum acquisition time with high source impedance, a buffer amplifier must be used. The only 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 50ns for full throughput rate). Figure 1. Acquisition Time vs Source Resistance in Bipolar and Unipolar Modes SOURCE RESISTANCE ( Ω) 300 900 1100 1000 1300 1500 200 100 800 500 700 600 400 1200 1400 10 1k 10k 5V 100k 1402 F01 0 100 ±5V 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 LTC1402 will depend 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 LTC1402. More detailed information is avail- able in the Linear Technology Databooks and on the LinearView TM CD-ROM. LT ®1206: 60MHz Current Feedback Amplifier with Shut- down Pin (Amplifier Draws 200 µA While in Shutdown). ±5V to ±15V supplies. Distortion is –80dB to 1MHz (2VP-P into 30Ω). Good for AC applications. Dual avail- able with shutdown as LT1207. Output swings to within 2VBE of the supply rails. LT1223: 100MHz Video Current Feedback Amplifier. 6mA supply current. ±5V to ±15V supplies. Low distortion at frequencies above 400kHz. Low noise. Good for AC appli- cations. LT1227: 140MHz Video Current Feedback Amplifier. 10mA supply current; has shutdown pin (draws 120 µA while in shutdown). ±5V to ±15V supplies. Lowest distortion (– 92dB) at frequencies above 400kHz. Low noise. Best for AC applications. LT1229/LT1230: Dual and Quad 100MHz Current Feed- back Amplifiers. ±2V to ±15V supplies. Low noise. Good AC specifications, 6mA supply current each amplifier. LT1360: 50MHz Voltage Feedback Amplifier. 3.8mA sup- ply current. ±5V to ±15V supplies. Good AC and DC specifications. 70ns settling to 0.5LSB. LT1363: 70MHz, 1000V/ µs Op Amps. 6.3mA supply cur- rent. Good AC and DC specifications. 60ns settling to 0.5LSB. LT1364/LT1365: Dual and Quad 70MHz, 1000V/ µs Op Amps. 6.3mA supply current per amplifier. 60ns settling to 0.5LSB. LinearView is a trademark of Linear Technology Corporation. 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 |
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