Datasheet LT6600-5 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | Very Low Noise, Differential Amplifier and 5MHz Lowpass Filter |
| Seiten / Seite | 12 / 7 — APPLICATIONS INFORMATION. Interfacing to the LT6600-5. Figure 1. Figure … |
| Dateiformat / Größe | PDF / 158 Kb |
| Dokumentensprache | Englisch |
APPLICATIONS INFORMATION. Interfacing to the LT6600-5. Figure 1. Figure 2. Figure 3
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LT6600-5
APPLICATIONS INFORMATION Interfacing to the LT6600-5
is 2VP-P for frequencies below 5MHz. The common mode output voltage is determined by the voltage at Pin 2. Since The LT6600-5 requires 2 equal external resistors, RIN, to Pin 2 is shorted to Pin 7, the output common mode is the set the differential gain to 806Ω/RIN. The inputs to the mid-supply voltage. In addition, the common mode input fi lter are the voltages V + – IN and VIN presented to these voltage can be equal to the mid-supply voltage of Pin 7 external components, Figure 1. The difference between (refer to the Distortion vs Input Common Mode Level V + – IN and VIN is the differential input voltage. The aver- graphs in the Typical Performance Characteristics). age of V + – IN and VIN is the common mode input voltage. Similarly, the voltages V + – OUT and VOUT appearing at Pins 4 Figure 2 shows how to AC couple signals into the LT6600-5. and 5 of the LT6600-5 are the fi lter outputs. The differ- In this instance, the input is a single-ended signal. AC ence between V + – OUT and VOUT is the differential output coupling allows the processing of single-ended or dif- voltage. The average of V + – OUT and VOUT is the common ferential signals with arbitrary common mode levels. The mode output voltage. 0.1μF coupling capacitor and the 806Ω gain setting resistor form a high pass fi lter, attenuating signals below 2kHz. Figure 1 illustrates the LT6600-5 operating with a single Larger values of coupling capacitors will proportionally 3.3V supply and unity passband gain; the input signal is reduce this highpass 3dB frequency. DC coupled. The common mode input voltage is 0.5V and the differential input voltage is 2VP-P. The common mode In Figure 3 the LT6600-5 is providing 12dB of gain. The output voltage is 1.65V and the differential output voltage gain resistor has an optional 62pF in parallel to improve 3.3V 0.1μF V V 3 806Ω 3 – 1 3 VIN – 4 + 7 + V + OUT V 2 2 OUT LT6600-5 2 V + – IN 0.01μF – V 1 OUT + 8 – VOUT 1 V 5 IN + 806Ω 6 0 t 0 t – 66005 F01 VIN
Figure 1
3.3V 0.1μF V V 0.1μF 806Ω 3 2 1 – 3 + 7 + 4 VOUT V + OUT 1 LT6600-5 2 2 V + 0.1μF IN 0.01μF – – VOUT 0 t + 8 – VOUT 1 V 5 IN + 806Ω 6 –1 0 66005 F02
Figure 2
62pF 5V 0.1μF V V 200Ω 3 – 1 3 3 VIN – + + 7 + 4 VOUT VOUT 2 LT6600-5 2 2 0.01μF – – VOUT 500mVP-P (DIFF) + 8 – VOUT 1 1 V 5 IN + V + 200Ω IN 6 0 t – + 0 t V 66005 F03 IN – 2V 0.01μF 62pF
Figure 3
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APPLICATIONS INFORMATION Interfacing to the LT6600-5
is 2VP-P for frequencies below 5MHz. The common mode output voltage is determined by the voltage at Pin 2. Since The LT6600-5 requires 2 equal external resistors, RIN, to Pin 2 is shorted to Pin 7, the output common mode is the set the differential gain to 806Ω/RIN. The inputs to the mid-supply voltage. In addition, the common mode input fi lter are the voltages V + – IN and VIN presented to these voltage can be equal to the mid-supply voltage of Pin 7 external components, Figure 1. The difference between (refer to the Distortion vs Input Common Mode Level V + – IN and VIN is the differential input voltage. The aver- graphs in the Typical Performance Characteristics). age of V + – IN and VIN is the common mode input voltage. Similarly, the voltages V + – OUT and VOUT appearing at Pins 4 Figure 2 shows how to AC couple signals into the LT6600-5. and 5 of the LT6600-5 are the fi lter outputs. The differ- In this instance, the input is a single-ended signal. AC ence between V + – OUT and VOUT is the differential output coupling allows the processing of single-ended or dif- voltage. The average of V + – OUT and VOUT is the common ferential signals with arbitrary common mode levels. The mode output voltage. 0.1μF coupling capacitor and the 806Ω gain setting resistor form a high pass fi lter, attenuating signals below 2kHz. Figure 1 illustrates the LT6600-5 operating with a single Larger values of coupling capacitors will proportionally 3.3V supply and unity passband gain; the input signal is reduce this highpass 3dB frequency. DC coupled. The common mode input voltage is 0.5V and the differential input voltage is 2VP-P. The common mode In Figure 3 the LT6600-5 is providing 12dB of gain. The output voltage is 1.65V and the differential output voltage gain resistor has an optional 62pF in parallel to improve 3.3V 0.1μF V V 3 806Ω 3 – 1 3 VIN – 4 + 7 + V + OUT V 2 2 OUT LT6600-5 2 V + – IN 0.01μF – V 1 OUT + 8 – VOUT 1 V 5 IN + 806Ω 6 0 t 0 t – 66005 F01 VIN
Figure 1
3.3V 0.1μF V V 0.1μF 806Ω 3 2 1 – 3 + 7 + 4 VOUT V + OUT 1 LT6600-5 2 2 V + 0.1μF IN 0.01μF – – VOUT 0 t + 8 – VOUT 1 V 5 IN + 806Ω 6 –1 0 66005 F02
Figure 2
62pF 5V 0.1μF V V 200Ω 3 – 1 3 3 VIN – + + 7 + 4 VOUT VOUT 2 LT6600-5 2 2 0.01μF – – VOUT 500mVP-P (DIFF) + 8 – VOUT 1 1 V 5 IN + V + 200Ω IN 6 0 t – + 0 t V 66005 F03 IN – 2V 0.01μF 62pF
Figure 3
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