Datasheet LT6604-15 (Analog Devices) - 9
| 制造商 | Analog Devices |
| 描述 | Dual Very Low Noise, Differential Amplifier and 15MHz Lowpass Filter |
| 页数 / 页 | 16 / 9 — APPLICATIONS INFORMATION. Interfacing to the LT6604-15. Figure 1. Figure 2 |
| 文件格式/大小 | PDF / 213 Kb |
| 文件语言 | 英语 |
APPLICATIONS INFORMATION. Interfacing to the LT6604-15. Figure 1. Figure 2
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LT6604-15
APPLICATIONS INFORMATION Interfacing to the LT6604-15
mode output voltage. Figure 1 illustrates the LT6604-15 operating with a single 3.3V supply and unity passband Note: The LT6604-15 contains two identical fi lters. The gain; the input signal is DC coupled. The common mode following applications information only refers to one fi lter. input voltage is 0.5V, and the differential input voltage is The two fi lters are independent except that they share the 2V same negative supply voltage V–. The two fi lters can be P-P. The common mode output voltage is 1.65V, and the differential output voltage is 2V used simultaneously by replicating the example circuits. P-P for frequencies below 15MHz. The common mode output voltage is determined The referenced pin numbers correspond to the A channel by the voltage at V fi lter OCM. Since VOCM is shorted to VMID, the output common mode is the mid-supply voltage. In The LT6604-15 channel requires two equal external re- addition, the common mode input voltage can be equal sistors, RIN, to set the differential gain to 536Ω/RIN. The to the mid-supply voltage of VMID. inputs to the fi lter are the voltages V + – IN and VIN presented Figure 2 shows how to AC couple signals into the LT6604-15. to these external components, Figure 1. The difference In this instance, the input is a single-ended signal. AC cou- between V + – IN and VIN is the differential input voltage. The pling allows the processing of single-ended or differential average of V + – IN and VIN is the common mode input voltage. signals with arbitrary common mode levels. The 0.1μF Similarly, the voltages V + – OUT and VOUT appearing at Pins coupling capacitor and the 536Ω gain setting resistor 27 and 29 of the LT6604-15 are the fi lter outputs. The dif- form a high pass fi lter, attenuating signals below 3kHz. ference between V + – OUT and VOUT is the differential output Larger values of coupling capacitors will proportionally voltage. The average of V + – OUT and VOUT is the common reduce this highpass 3dB frequency. 3.3V 0.1μF V V 3 536Ω 25 – 4 3 VIN – 27 + 34 1/2 + V + OUT V 2 2 OUT LT6604-15 6 V + – IN 0.01μF – V 1 OUT + 2 – VOUT 1 V 29 IN + 536Ω 7 0 t 0 t – 660415 F01 VIN
Figure 1
3.3V 0.1μF V V 0.1μF 25 536Ω 2 4 – 3 27 1/2 + 34 + VOUT V + OUT 1 LT6604-15 2 6 V + 0.1μF IN 0.01μF – – VOUT 0 t + 2 – VOUT 1 V 29 IN + 536Ω 7 –1 0 660415 F02
Figure 2
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APPLICATIONS INFORMATION Interfacing to the LT6604-15
mode output voltage. Figure 1 illustrates the LT6604-15 operating with a single 3.3V supply and unity passband Note: The LT6604-15 contains two identical fi lters. The gain; the input signal is DC coupled. The common mode following applications information only refers to one fi lter. input voltage is 0.5V, and the differential input voltage is The two fi lters are independent except that they share the 2V same negative supply voltage V–. The two fi lters can be P-P. The common mode output voltage is 1.65V, and the differential output voltage is 2V used simultaneously by replicating the example circuits. P-P for frequencies below 15MHz. The common mode output voltage is determined The referenced pin numbers correspond to the A channel by the voltage at V fi lter OCM. Since VOCM is shorted to VMID, the output common mode is the mid-supply voltage. In The LT6604-15 channel requires two equal external re- addition, the common mode input voltage can be equal sistors, RIN, to set the differential gain to 536Ω/RIN. The to the mid-supply voltage of VMID. inputs to the fi lter are the voltages V + – IN and VIN presented Figure 2 shows how to AC couple signals into the LT6604-15. to these external components, Figure 1. The difference In this instance, the input is a single-ended signal. AC cou- between V + – IN and VIN is the differential input voltage. The pling allows the processing of single-ended or differential average of V + – IN and VIN is the common mode input voltage. signals with arbitrary common mode levels. The 0.1μF Similarly, the voltages V + – OUT and VOUT appearing at Pins coupling capacitor and the 536Ω gain setting resistor 27 and 29 of the LT6604-15 are the fi lter outputs. The dif- form a high pass fi lter, attenuating signals below 3kHz. ference between V + – OUT and VOUT is the differential output Larger values of coupling capacitors will proportionally voltage. The average of V + – OUT and VOUT is the common reduce this highpass 3dB frequency. 3.3V 0.1μF V V 3 536Ω 25 – 4 3 VIN – 27 + 34 1/2 + V + OUT V 2 2 OUT LT6604-15 6 V + – IN 0.01μF – V 1 OUT + 2 – VOUT 1 V 29 IN + 536Ω 7 0 t 0 t – 660415 F01 VIN
Figure 1
3.3V 0.1μF V V 0.1μF 25 536Ω 2 4 – 3 27 1/2 + 34 + VOUT V + OUT 1 LT6604-15 2 6 V + 0.1μF IN 0.01μF – – VOUT 0 t + 2 – VOUT 1 V 29 IN + 536Ω 7 –1 0 660415 F02
Figure 2
660415fb 9