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LT6600IDF-2.5-PBF Datasheet(PDF) 11 Page - Linear Technology |
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LT6600IDF-2.5-PBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LT6600-2.5 11 660025fb APPLICATIONS INFORMATION VMID can be allowed to float, but it must be bypassed to an AC ground with a 0.01μF capacitor or some instability maybe observed. VMID can be driven from a low impedance source, provided it remains at least 1.5V above V– and at least 1.5V below V+. An internal resistor divider sets the voltage of VMID. While the internal 11k resistors are well matched, their absolute value can vary by ±20%. This should be taken into consideration when connecting an external resistor network to alter the voltage of VMID. VOCM can be shorted to VMID for simplicity. If a different common mode output voltage is required, connect VOCM to a voltage source or resistor network. For 3V and 3.3V supplies the voltage at VOCM must be less than or equal to the mid supply level. For example, voltage (VOCM) ≤ 1.65V on a single 3.3V supply. For power supply voltages higher than 3.3V the voltage at VOCM can be set above mid supply, as shown in Table 1. The voltage on VOCM should not exceed 1V below the voltage on VMID. VOCM is a high impedance input. Table 1. Output Common Range for Various Supplies SUPPLY VOLTAGE DIFFERENTIAL OUT VOLTAGE SWING OUTPUT COMMON MODE RANGE FOR LOW DISTORTION 3V 4VP-P 1.4V ≤ VOCM ≤ 1.6V 2VP-P 1V ≤ VOCM ≤ 1.6V 1VP-P 0.75V ≤ VOCM ≤ 1.6V 5V 8VP-P 2.4V ≤ VOCM ≤ 2.6V 4VP-P 1.5V ≤ VOCM ≤ 3.5V 2VP-P 1V ≤ VOCM ≤ 3.75V 1VP-P 0.75V ≤ VOCM ≤ 3.75V ±5V 9VP-P –2V ≤ VOCM ≤ 2V 4VP-P –3.5V ≤ VOCM ≤ 3.5V 2VP-P –3.75V ≤ VOCM ≤ 3.75V 1VP-P –4.25V ≤ VOCM ≤ 3.75V NOTE: VOCM is set by the voltage at this RIN. The voltage at VOCM should not exceed 1V below the voltage at VMID. To achieve some of the output common mode ranges shown in the table, the voltage at VMID must be set externally to a value below mid supply. The LT6600-2.5 was designed to process a variety of input signals including signals centered around the mid-sup- ply voltage and signals that swing between ground and a positive voltage in a single supply system (Figure 1). The range of allowable input common mode voltage (the average of VIN+ and VIN– in Figure 1) is determined by the power supply level and gain setting (see “Electrical Characteristics”). Common Mode DC Currents InapplicationslikeFigure1andFigure3wheretheLT6600-2.5 not only provides lowpass filtering but also level shifts the common mode voltage of the input signal, DC currents will be generated through the DC path between input and output terminals. Minimize these currents to decrease power dissipation and distortion. Consider the application in Figure 3. VMID sets the output common mode voltage of the 1st differential amplifier inside the LT6600-2.5 (see the “Block Diagram” section)at 2.5V. Since the input common mode voltage is near 0V, there will be approximately a total of 2.5V drop across the series combination of the internal 1580Ω feedback resistor and the external 402Ω input resistor. The resulting 1.25mA common mode DC current in each input path,must be absorbed by the sources VIN+ and VIN–. VOCM sets the common mode output voltage of the 2nd differential amplifier inside the LT6600-2.5, and therefore sets the common mode output voltage of the filter. Since, in the example of Figure 3, VOCM differs from VMID by 0.5V, an additional 625μA (312μA per side) of DC current will flow in the resistors coupling the 1st differential amplifier output stage to filter output. Thus, a total of 3.125mA is used to translate the common mode voltages. A simple modification to Figure 3 will reduce the DC com- mon mode currents by 36%. If VMID is shorted toVOCM the common mode output voltage of both op amp stages will be 2V and the resulting DC current will be 2mA. Of course, by AC coupling the inputs of Figure 3, the common mode DC current can be reduced to 625μA. |
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