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LTC1401C Datasheet(PDF) 9 Page - Linear Technology |
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LTC1401C Datasheet(HTML) 9 Page - Linear Technology |
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9 / 20 page  9 LTC1401 APPLICATIONS INFORMATION Driving the Analog Input The analog input of the LTC1401 is easy to drive. It draws only one small current spike while charging the sample- and-hold capacitor at the end of a conversion. During conversion, the analog input draws only a small leakage current. The only requirement is that the amplifier driving the analog input must settle after the small current spike before the next conversion starts. Any op amp that settles in 315ns to small load current transients will allow maxi- mum speed operation. If a slower op amp is used, more settling time can be provided by increasing the time between conversions. Suitable devices capable of driving the ADC’s AIN input include the LT ® 1498 and the LT1630 op amps. The following list is a summary of the op amps that are suitable for driving the LTC1401, more detailed informa- tion is available in the Linear Technology databooks and the LinearView TM CD-ROM. LT1215/LT1216: Dual and quad 23MHz, 50V/ µs single supply op amps. Single 5V to ±15V supplies, 6.6mA specifications, 90ns settling to 0.5LSB. LT1229/LT1230: Dual and quad 100MHz current feedback amplifiers. ±2V to ±15V supplies, 6mA supply current each amplifier. Low noise. Good AC specs. LT1498/LT1499: Dual or quad 10MHz, 6V/ µs, single 2.2V to ±15V supplies, 1.7mA supply current per ampli- fier, input/output swings rail-to-rail. Excellent AC and DC specs. LT1630: Dual or quad 30MHz, 10V/ µs, single 2.7V to ±15V supplies, 3.5mA supply current per amplifier, input/output swings rail-to-rail. Good AC and DC specs. Internal Reference The LTC1401 has an on-chip, temperature compensated, curvature corrected, bandgap reference, which is factory trimmed to 1.20V. It is internally connected to the DAC and ence frequencies of mfa ±nfb, where m and n = 0, 1, 2, 3, etc. For example, the 2nd order IMD terms include (fa + fb) and (fa – fb) while 3rd order IMD terms includes (2fa + fb), (2fa – fb), (fa + 2fb) and (fa – 2fb). If the two input sine waves are equal in magnitude, the value (in decibels) of the 2nd order IMD products can be expressed by the following formula. IMD fa fb fa fb ± () = ± 20log Amplitude at ( ) Amplitude at fa Figure 5 shows the IMD performance at a 50kHz input. Figure 5. Intermodulation Distortion Plot FREQUENCY (kHz) 020 40 50 70 90 10 30 60 80 100 LTC1401 • F05 0 –10 –20 –30 –40 –50 – 60 –70 –80 –90 –100 –110 –120 fSAMPLE = 200kHz fa = 49.853kHz fb = 53.076kHz TA = 25°C fa fb 3fa 2fb – fa 2fa + fb 2fa – fb 2fb + fa 2fa 3fb fa + fb 2fb fb – fa Peak Harmonic or Spurious Noise The peak harmonic or spurious noise is the largest spec- tral component excluding the input signal and DC. This value is expressed in decibels relative to the RMS value of a full-scale input signal. Full Power and Full Linear Bandwidth The full power bandwidth is the input frequency at which the amplitude of the reconstructed fundamental is reduced by 3dB for a full-scale input signal. The full linear bandwidth is the input frequency at which the S/(N+D) has dropped to 68dB (11 effective bits). LinearView is a trademark of Linear Technology Corporation. |
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