Datasheet LT6604-5 (Analog Devices) - 9
| 制造商 | Analog Devices |
| 描述 | Dual Very Low Noise, Differential Amplifier and 5MHz Lowpass Filter |
| 页数 / 页 | 16 / 9 — APPLICATIONS INFORMATION. Interfacing to the LT6604-5. Figure 1. Figure … |
| 文件格式/大小 | PDF / 192 Kb |
| 文件语言 | 英语 |
APPLICATIONS INFORMATION. Interfacing to the LT6604-5. Figure 1. Figure 2. Figure 3
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LT6604-5
APPLICATIONS INFORMATION Interfacing to the LT6604-5
gain; the input signal is DC-coupled. The common mode input voltage is 0.5V, and the differential input voltage is Note: The LT6604-5 contains two identical fi lters. The fol- 2V lowing applications information only refers to one fi lter. P-P. The common mode output voltage is 1.65V, and the differential output voltage is 2V The two fi lters are independent except that they share the P-P for frequencies below 5MHz. The common mode output voltage is determined same negative supply voltage V–. The two fi lters can be by the voltage at V used simultaneously by replicating the example circuits. OCM. Since VOCM is shorted to VMID, the output common mode is the mid supply voltage. In The referenced pin numbers correspond to the A channel addition, the common mode input voltage can be equal fi lter. to the mid supply voltage of VMID. Each LT6604-5 channel requires two equal external re- Figure 2 shows how to AC couple signals into the LT6604-5. sistors, RIN, to set the differential gain to 806Ω/RIN. The In this instance, the input is a single-ended signal. AC-cou- inputs to the fi lter are the voltages V + – IN and VIN presented pling allows the processing of single-ended or differential to these external components, Figure 1. The difference signals with arbitrary common mode levels. The 0.1μF between V + – IN and VIN is the differential input voltage. coupling capacitor and the 806Ω gain setting resistor form The average of V + – IN and VIN is the common mode input a high pass fi lter, attenuating signals below 2kHz. Larger voltage. Similarly, the voltages V + – OUT and VOUT appearing values of coupling capacitors will proportionally reduce at Pins 27 and 29 of the LT6604-5 are the fi lter outputs. this highpass 3dB frequency. The difference between V + – OUT and VOUT is the differential output voltage. The average of V + – OUT and VOUT is the com- In Figure 3 the LT6604-5 is providing 12dB of gain. The mon mode output voltage. Figure 1 illustrates the LT6604-5 gain resistor has an optional 62pF in parallel to improve operating with a single 3.3V supply and unity passband the passband fl atness near 5MHz. The common mode output voltage is set to 2V. 3.3V 0.1μF V V 25 3 806Ω – 3 4 VIN – 27 34 + V + + 1/2 OUT V 2 2 OUT LT6604-5 6 V + – IN 0.01μF – V 1 OUT + 2 – VOUT 1 V 29 IN + 806Ω 0 t 7 0 t – 66045 F01 VIN
Figure 1
3.3V 0.1μF V V 0.1μF 25 806Ω 2 4 – 3 34 1/2 + 27 V + OUT V + OUT 1 LT6604-5 2 6 V + 0.1μF IN 0.01μF – – VOUT 0 t + 2 – VOUT 1 V 29 IN + 806Ω 7 –1 0 t 66045 F02
Figure 2
62pF 5V 0.1μF V V 25 200Ω – 4 3 3 VIN – + + 34 1/2 + 27 VOUT VOUT 2 LT6604-5 2 6 0.01μF – – VOUT 500mVP-P (DIFF) + 2 – VOUT 1 1 V 29 IN + V + 200Ω IN 7 0 t – + 0 t V 66045 F03 IN – 2V 62pF
Figure 3
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APPLICATIONS INFORMATION Interfacing to the LT6604-5
gain; the input signal is DC-coupled. The common mode input voltage is 0.5V, and the differential input voltage is Note: The LT6604-5 contains two identical fi lters. The fol- 2V lowing applications information only refers to one fi lter. P-P. The common mode output voltage is 1.65V, and the differential output voltage is 2V The two fi lters are independent except that they share the P-P for frequencies below 5MHz. The common mode output voltage is determined same negative supply voltage V–. The two fi lters can be by the voltage at V used simultaneously by replicating the example circuits. OCM. Since VOCM is shorted to VMID, the output common mode is the mid supply voltage. In The referenced pin numbers correspond to the A channel addition, the common mode input voltage can be equal fi lter. to the mid supply voltage of VMID. Each LT6604-5 channel requires two equal external re- Figure 2 shows how to AC couple signals into the LT6604-5. sistors, RIN, to set the differential gain to 806Ω/RIN. The In this instance, the input is a single-ended signal. AC-cou- inputs to the fi lter are the voltages V + – IN and VIN presented pling allows the processing of single-ended or differential to these external components, Figure 1. The difference signals with arbitrary common mode levels. The 0.1μF between V + – IN and VIN is the differential input voltage. coupling capacitor and the 806Ω gain setting resistor form The average of V + – IN and VIN is the common mode input a high pass fi lter, attenuating signals below 2kHz. Larger voltage. Similarly, the voltages V + – OUT and VOUT appearing values of coupling capacitors will proportionally reduce at Pins 27 and 29 of the LT6604-5 are the fi lter outputs. this highpass 3dB frequency. The difference between V + – OUT and VOUT is the differential output voltage. The average of V + – OUT and VOUT is the com- In Figure 3 the LT6604-5 is providing 12dB of gain. The mon mode output voltage. Figure 1 illustrates the LT6604-5 gain resistor has an optional 62pF in parallel to improve operating with a single 3.3V supply and unity passband the passband fl atness near 5MHz. The common mode output voltage is set to 2V. 3.3V 0.1μF V V 25 3 806Ω – 3 4 VIN – 27 34 + V + + 1/2 OUT V 2 2 OUT LT6604-5 6 V + – IN 0.01μF – V 1 OUT + 2 – VOUT 1 V 29 IN + 806Ω 0 t 7 0 t – 66045 F01 VIN
Figure 1
3.3V 0.1μF V V 0.1μF 25 806Ω 2 4 – 3 34 1/2 + 27 V + OUT V + OUT 1 LT6604-5 2 6 V + 0.1μF IN 0.01μF – – VOUT 0 t + 2 – VOUT 1 V 29 IN + 806Ω 7 –1 0 t 66045 F02
Figure 2
62pF 5V 0.1μF V V 25 200Ω – 4 3 3 VIN – + + 34 1/2 + 27 VOUT VOUT 2 LT6604-5 2 6 0.01μF – – VOUT 500mVP-P (DIFF) + 2 – VOUT 1 1 V 29 IN + V + 200Ω IN 7 0 t – + 0 t V 66045 F03 IN – 2V 62pF
Figure 3
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