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1402 Datasheet(PDF) 11 Page - Linear Technology |
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1402 Datasheet(HTML) 11 Page - Linear Technology |
11 / 24 page 11 LTC1402 APPLICATIONS INFORMATION less susceptible to both problems. When high amplitude unwanted signals are close in frequency to the desired signal frequency, a multiple pole filter is required. Figure 3 shows a simple implementation using an LTC1560-1, a fifth order elliptic continuous-time 1MHz filter. BIPOLAR AND UNIPOLAR INPUT RANGES The ±2V bipolar input range of the LTC1402 is optimized for low noise and low distortion. Most op amps also perform best over this same range, allowing direct cou- pling to the analog inputs and eliminating the need for special translation circuitry. The inputs of the LTC1402 may also be driven fully differential in bipolar mode with a single supply. Each input should not swing more than 2VP-P individually to get the best performance from single supply amplifiers. The 0V to 4V range is ideal for single ended input use with single supply applications. LTC1402 AIN + AIN – VREF AGND1 AGND2 GAIN 1402 F02 3 4 2 6 5 7 10 µF 68pF 51 Ω ANALOG INPUT Figure 2. RC Input Filter LTC1560-1 1 2 3 4 8 7 6 5 0.1 µF 5V 0.1 µF –5V VIN LTC1402 AIN + AIN – VREF AGND1 AGND2 GAIN 1402 F03 3 4 2 6 5 7 10 µF Figure 3. 1MHz Fifth Order Elliptic Lowpass Filter LT1630: 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. LT1813: Dual 100MHz 750V/ µs 3mA Voltage Feedback Amplifier. 5V to ±5V supplies. Distortion is – 86dB to 100kHz and – 77dB to 1MHz with ±5V supplies (2VP-P into 500 Ω). Excellent part for fast AC applications with ±5V supplies. INPUT FILTERING AND SOURCE IMPEDANCE The noise and the distortion of the input amplifier and other circuitry must be considered since they will add to the LTC1402 noise and distortion. The small-signal band- width of the sample-and-hold circuit is 80MHz. 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 many applications. For example, Figure 2 shows a 68pF capacitor from AIN+ to ground and a 51Ω source resistor to limit the input bandwidth to 47MHz. The 68pF capacitor also acts as a charge reservoir for the input sample-and- hold and isolates the ADC input from sampling glitch- sensitive circuitry. High quality capacitors and resistors should be used since these components can add distortion. NPO and silver mica type dielectric capacitors have excellent linearity. Carbon surface mount resistors can generate distortion from self heating and from damage that may occur during soldering. Metal film surface mount resistors are much |
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