Datasheet LT6600-15 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | Very Low Noise, Differential Amplifier and 15MHz Lowpass Filter |
| Seiten / Seite | 12 / 7 — APPLICATIONS INFORMATION. Interfacing to the LT6600-15. Figure 1. Figure … |
| Dateiformat / Größe | PDF / 162 Kb |
| Dokumentensprache | Englisch |
APPLICATIONS INFORMATION. Interfacing to the LT6600-15. Figure 1. Figure 2. Figure 3
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LT6600-15
APPLICATIONS INFORMATION Interfacing to the LT6600-15
output voltage is 1.65V, and the differential output voltage is 2V The LT6600-15 requires two equal external resistors, R P-P for frequencies below 15MHz. The common mode IN, output voltage is determined by the voltage at Pin 2. Since to set the differential gain to 536Ω/RIN. The inputs to the Pin 2 is shorted to Pin 7, the output common mode is the fi lter are the voltages V + – IN and VIN presented to these mid-supply voltage. In addition, the common mode input external components, Figure 1. The difference between voltage can be equal to the mid-supply voltage of Pin 7 V + – IN and VIN is the differential input voltage. The aver- (see the Distortion vs Input Common Mode Level graphs age of V + – IN and VIN is the common mode input voltage. in the Typical Performance Characteristics section). Similarly, the voltages V + – OUT and VOUT appearing at Pins 4 and 5 of the LT6600-15 are the fi lter outputs. The differ- Figure 2 shows how to AC couple signals into the ence between V + – OUT and VOUT is the differential output LT6600-15. In this instance, the input is a single-ended voltage. The average of V + – OUT and VOUT is the common signal. AC coupling allows the processing of single-ended mode output voltage. or differential signals with arbitrary common mode levels. The 0.1μF coupling capacitor and the 536Ω gain setting Figure 1 illustrates the LT6600-15 operating with a single resistor form a high pass fi lter, attenuating signals below 3.3V supply and unity passband gain; the input signal is 3kHz. Larger values of coupling capacitors will proportion- DC coupled. The common mode input voltage is 0.5V, and ally reduce this highpass 3dB frequency. the differential input voltage is 2VP-P. The common mode 3.3V 0.1μF V V 3 536Ω 3 – 1 3 VIN – 4 + 7 + V + OUT V 2 2 OUT LT6600-15 2 V + – IN 0.01μF – V 1 OUT + 8 – VOUT 1 V 5 IN + 536Ω 6 0 t 0 t – 660015 F01 VIN
Figure 1
3.3V 0.1μF V V 0.1μF 536Ω 3 2 1 – 3 + 7 + 4 VOUT V + 1 LT6600-15 OUT 2 2 V + 0.1μF IN 0.01μF – – VOUT 0 t + 8 – VOUT 1 V 5 IN + 536Ω 6 –1 0 660015 F02
Figure 2
62pF 5V 0.1μF V V 133Ω 3 – 1 3 3 VIN – + + 7 + 4 VOUT VOUT LT6600-15 2 2 2 0.01μF – – VOUT 500mVP-P (DIFF) + 8 – VOUT 1 1 V 5 IN + V + 133Ω IN 6 0 t – + 0 t V 660015 F03 IN – 2V 62pF
Figure 3
660015fb 7
APPLICATIONS INFORMATION Interfacing to the LT6600-15
output voltage is 1.65V, and the differential output voltage is 2V The LT6600-15 requires two equal external resistors, R P-P for frequencies below 15MHz. The common mode IN, output voltage is determined by the voltage at Pin 2. Since to set the differential gain to 536Ω/RIN. The inputs to the Pin 2 is shorted to Pin 7, the output common mode is the fi lter are the voltages V + – IN and VIN presented to these mid-supply voltage. In addition, the common mode input external components, Figure 1. The difference between voltage can be equal to the mid-supply voltage of Pin 7 V + – IN and VIN is the differential input voltage. The aver- (see the Distortion vs Input Common Mode Level graphs age of V + – IN and VIN is the common mode input voltage. in the Typical Performance Characteristics section). Similarly, the voltages V + – OUT and VOUT appearing at Pins 4 and 5 of the LT6600-15 are the fi lter outputs. The differ- Figure 2 shows how to AC couple signals into the ence between V + – OUT and VOUT is the differential output LT6600-15. In this instance, the input is a single-ended voltage. The average of V + – OUT and VOUT is the common signal. AC coupling allows the processing of single-ended mode output voltage. or differential signals with arbitrary common mode levels. The 0.1μF coupling capacitor and the 536Ω gain setting Figure 1 illustrates the LT6600-15 operating with a single resistor form a high pass fi lter, attenuating signals below 3.3V supply and unity passband gain; the input signal is 3kHz. Larger values of coupling capacitors will proportion- DC coupled. The common mode input voltage is 0.5V, and ally reduce this highpass 3dB frequency. the differential input voltage is 2VP-P. The common mode 3.3V 0.1μF V V 3 536Ω 3 – 1 3 VIN – 4 + 7 + V + OUT V 2 2 OUT LT6600-15 2 V + – IN 0.01μF – V 1 OUT + 8 – VOUT 1 V 5 IN + 536Ω 6 0 t 0 t – 660015 F01 VIN
Figure 1
3.3V 0.1μF V V 0.1μF 536Ω 3 2 1 – 3 + 7 + 4 VOUT V + 1 LT6600-15 OUT 2 2 V + 0.1μF IN 0.01μF – – VOUT 0 t + 8 – VOUT 1 V 5 IN + 536Ω 6 –1 0 660015 F02
Figure 2
62pF 5V 0.1μF V V 133Ω 3 – 1 3 3 VIN – + + 7 + 4 VOUT VOUT LT6600-15 2 2 2 0.01μF – – VOUT 500mVP-P (DIFF) + 8 – VOUT 1 1 V 5 IN + V + 133Ω IN 6 0 t – + 0 t V 660015 F03 IN – 2V 62pF
Figure 3
660015fb 7