Datasheet LT6600-2.5 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | Very Low Noise, Differential Amplifi er and 2.5MHz Lowpass Filter |
| Pages / Page | 16 / 8 — APPLICATIONS INFORMATION. Interfacing to the LT6600-2.5. Figure 1. (S8 … |
| File Format / Size | PDF / 233 Kb |
| Document Language | English |
APPLICATIONS INFORMATION. Interfacing to the LT6600-2.5. Figure 1. (S8 Pin Numbers). Figure 2. (S8 Pin Numbers)
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LT6600-2.5
APPLICATIONS INFORMATION Interfacing to the LT6600-2.5
DC-coupled. The common mode input voltage is 0.5V, and the differential input voltage is 2V Note: The referenced pin numbers correspond to the S8 P-P. The common mode output voltage is 1.65V, and the differential output voltage package. See the Pin Functions for the equivalent DFN-12 is 2V package pin numbers. P-P for frequencies below 2.5MHz. The common mode output voltage is determined by the voltage at VOCM. Since The LT6600-2.5 requires two equal external resistors, RIN, VOCM is shorted to VMID, the output common mode is the to set the differential gain to 1580Ω/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 the see voltage can be equal to the mid-supply voltage of VMID. external components, Figure 1. The difference between Figure 2 shows how to AC couple signals into the LT6600-2.5. V + – IN and VIN is the differential input voltage. The aver- In this instance, the input is a single-ended signal. age of V + – IN and VIN is the common mode input voltage. AC-coupling allows the processing of single-ended or Similarly, the voltages V + – OUT and VOUT appearing at Pins 4 differential signals with arbitrary common mode levels. and 5 of the LT6600-2.5 are the fi lter outputs. The differ- The 0.1μF coupling capacitor and the 1580Ω gain set- ence between V + – OUT and VOUT is the differential output ting resistor form a highpass fi lter, attenuating signals voltage. The average of V + – OUT and VOUT is the common below 1kHz. Larger values of coupling capacitors will mode output voltage. proportionally reduce this highpass 3dB frequency. Figure 1 illustrates the LT6600-2.5 operating with a single In Figure 3 the LT6600-2.5 is providing 12dB of gain. The 3.3V supply and unity passband gain; the input signal is common mode output voltage is set to 2V. 3.3V 0.1μF V V 3 1580Ω 3 – 1 3 VIN – 4 + 7 + V + OUT V 2 2 OUT LT6600-2.5 2 V + – IN 0.01μF – V 1 OUT + 8 – VOUT 1 V 5 IN + 1580Ω 6 0 t 0 t – 660025 F01 VIN
Figure 1. (S8 Pin Numbers)
3.3V 0.1μF V V 0.1μF 1580Ω 3 2 1 – 3 + 7 + 4 VOUT V + 1 LT6600-2.5 OUT 2 2 V + 0.1μF IN 0.01μF – – VOUT 0 t + 8 – VOUT 1 V 5 IN + 1580Ω 6 –1 0 t 660025 F02
Figure 2. (S8 Pin Numbers)
5V 0.1μF V V 402Ω 3 – 1 3 3 VIN – + + 7 + 4 VOUT VOUT LT6600-2.5 2 2 2 0.01μF – – VOUT 500mVP-P (DIFF) + 8 – VOUT 1 1 V 5 IN + V + 402Ω IN 6 0 t – + 0 t V 660025 F03 IN – 2V
Figure 3. (S8 Pin Numbers)
660025fe 8
APPLICATIONS INFORMATION Interfacing to the LT6600-2.5
DC-coupled. The common mode input voltage is 0.5V, and the differential input voltage is 2V Note: The referenced pin numbers correspond to the S8 P-P. The common mode output voltage is 1.65V, and the differential output voltage package. See the Pin Functions for the equivalent DFN-12 is 2V package pin numbers. P-P for frequencies below 2.5MHz. The common mode output voltage is determined by the voltage at VOCM. Since The LT6600-2.5 requires two equal external resistors, RIN, VOCM is shorted to VMID, the output common mode is the to set the differential gain to 1580Ω/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 the see voltage can be equal to the mid-supply voltage of VMID. external components, Figure 1. The difference between Figure 2 shows how to AC couple signals into the LT6600-2.5. V + – IN and VIN is the differential input voltage. The aver- In this instance, the input is a single-ended signal. age of V + – IN and VIN is the common mode input voltage. AC-coupling allows the processing of single-ended or Similarly, the voltages V + – OUT and VOUT appearing at Pins 4 differential signals with arbitrary common mode levels. and 5 of the LT6600-2.5 are the fi lter outputs. The differ- The 0.1μF coupling capacitor and the 1580Ω gain set- ence between V + – OUT and VOUT is the differential output ting resistor form a highpass fi lter, attenuating signals voltage. The average of V + – OUT and VOUT is the common below 1kHz. Larger values of coupling capacitors will mode output voltage. proportionally reduce this highpass 3dB frequency. Figure 1 illustrates the LT6600-2.5 operating with a single In Figure 3 the LT6600-2.5 is providing 12dB of gain. The 3.3V supply and unity passband gain; the input signal is common mode output voltage is set to 2V. 3.3V 0.1μF V V 3 1580Ω 3 – 1 3 VIN – 4 + 7 + V + OUT V 2 2 OUT LT6600-2.5 2 V + – IN 0.01μF – V 1 OUT + 8 – VOUT 1 V 5 IN + 1580Ω 6 0 t 0 t – 660025 F01 VIN
Figure 1. (S8 Pin Numbers)
3.3V 0.1μF V V 0.1μF 1580Ω 3 2 1 – 3 + 7 + 4 VOUT V + 1 LT6600-2.5 OUT 2 2 V + 0.1μF IN 0.01μF – – VOUT 0 t + 8 – VOUT 1 V 5 IN + 1580Ω 6 –1 0 t 660025 F02
Figure 2. (S8 Pin Numbers)
5V 0.1μF V V 402Ω 3 – 1 3 3 VIN – + + 7 + 4 VOUT VOUT LT6600-2.5 2 2 2 0.01μF – – VOUT 500mVP-P (DIFF) + 8 – VOUT 1 1 V 5 IN + V + 402Ω IN 6 0 t – + 0 t V 660025 F03 IN – 2V
Figure 3. (S8 Pin Numbers)
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