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LTC1051CN8 Datasheet(PDF) 9 Page - Linear Technology |
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LTC1051CN8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 16 page 9 LTC1051/LTC1053 10513fa 2. If we arbitrarily accept that “aliasing” occurs when output alias signals reach an amplitude of 0.01% or more of the output signal, then: the approximate minimum frequency of an AC input signal which will cause aliasing is equal to the internal clock frequency multiplied by the square root of the op amp feedback factor. For instance, with closed-loop gain of –10, the feedback factor is 1/11 and if fCLK = 2.6kHz, alias signals can be detected when the frequency of the input signal exceeds 750Hz to 800Hz (Figure 5a). 3. The number of alias signals increases when the input signal frequency increases (Figure 5b). 4. When the frequency, fIN, of the input signal is less than fCLOCK, the alias signal(s) amplitude(s) directly scale with the amplitude of the incoming signal. The output “signal to alias ratio” cannot be increased by just boosting the input signal amplitude. However, when the input AC signal frequency well exceeds the clock frequency, the amplitude of the alias signals does not directly scale with the input amplitude. The “signal to alias ratio” increases when the output swings closely to the rails. (See Figure 5b and Figure 7.) It is important to note that the LTC1051/ LTC1053 op amps, under light loads (RL ≥ 10k), swing closely to the supply rails without generating harmonic distortion (Figure 8). B: MAG RANGE: 9dBV STATUS: PAUSED RMS: 25 13dBV 15dB /DIV –107 CENTER: 2 625Hz X: 2535Hz BW: 19.097Hz Y: – 74.16dBV SPAN: 2 000Hz fIN = 2.685kHz fCLK 2fCLK – fIN 83.5dB – + 1/2 LTC1051 1051/53 F05a 10k 10k 0.1µF 0.1µF 50pF 5V –5V NOTE: THE fCLK – fIN = 85Hz ALIAS FREQUENCY IS 95dB DOWN FROM THE OUTPUT LEVEL VIN = 10kHz 8VP-P Figure 6b. Output Voltage Spectrum of 1/2 LTC1051 Operating as a Unity-Gain Inverting Amplifier. VS = ±5V, RL = 10k, CL = 50pF, VIN = 8VP-P, 10kHz Figure 6a. Output Voltage Spectrum of 1/2 LTC1051 Operating as a Unity-Gain Inverting Amplifier. VS = ±5V, RL = 10k, CL = 50pF, VIN = 8VP-P, 2.685kHz B: MAG RANGE: 9dBV STATUS: PAUSED RMS: 50 13dBV 15dB /DIV –107 CENTER: 10 000Hz X: 10000Hz BW: 95.485Hz Y: 7.98dBV SPAN: 10 000Hz fIN = 10kHz fIN – fCLK 2 • fCLK 6fCLK – fIN 80dB 15dB 1kHz 5fCLK – fIN fIN – 2fCLK NOTE: ALL ALIAS FREQUENCY 80dB TO 84dB DOWN FROM OUTPUT APPLICATIO S I FOR ATIO |
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