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LT6600CS8-10 Datasheet(PDF) 8 Page - Linear Technology |
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LT6600CS8-10 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page LT6600-10 8 6600f APPLICATIO S I FOR ATIO the passband flatness near 10MHz. The common mode output voltage is set to 2V. Use Figure 4 to determine the interface between the LT6600-10 and a current output DAC. The gain, or “trans- impedance”, is defined as A = VOUT/IIN Ω. To compute the transimpedance, use the following equation: A R RR = + Ω 402 1 12 • By setting R1 + R2 = 402 Ω, the gain equation reduces to A = R1 Ω. The voltage at the pins of the DAC is determined by R1, R2, the voltage on Pin 7 and the DAC output current (IIN+ or IIN–). Consider Figure 4 with R1 = 49.9Ω and R2 = 348 Ω. The voltage at Pin 7 is 1.65V. The voltage at the DAC pins is given by: VV R RR I RR RR mV I DAC PIN IN IN = ++ + + =+ Ω 7 1 1 2 402 12 12 103 43 6 • • . IIN is IIN– or IIN+.The transimpedance in this example is 50.4 Ω. Figure 5 is a laboratory setup that can be used to charac- terize the LT6600-10 using single-ended instruments with 50 Ω source impedance and 50Ω input impedance. For a unity gain configuration the LT6600-10 requires a 402 Ω source resistance yet the network analyzer output is calibrated for a 50 Ω load resistance. The 1:1 transformer, 53.6 Ω and 388Ω resistors satisfy the two constraints above. The transformer converts the single-ended source into a differential stimulus. Similarly, the output the LT6600-10 will have lower distortion with larger load resistance yet the analyzer input is typically 50 Ω. The 4:1 turns (16:1 impedance) transformer and the two 402 Ω resistors of Figure 5, present the output of the LT6600-10 with a 1600 Ω differential load, or the equivalent of 800Ω to ground at each output. The impedance seen by the network analyzer input is still 50 Ω, reducing reflections in the cabling between the transformer and analyzer input. Figure 5 – + 0.1 µF 0.01 µF 3.3V – + LT6600-10 3 4 VOUT + IIN + IIN – VOUT – 1 7 2 8 5 6 6600 F04 CURRENT OUTPUT DAC R1 R1 R2 R2 Figure 4 Evaluating the LT6600-10 The low impedance levels and high frequency operation of the LT6600-10 require some attention to the matching networks between the LT6600-10 and other devices. The previous examples assume an ideal (0 Ω) source imped- ance and a large (1k Ω) load resistance. Among practical examples where impedance must be considered is the evaluation of the LT6600-10 with a network analyzer. – + 0.1 µF 0.1 µF 2.5V – 2.5V – + LT6600-10 3 4 1 7 2 8 5 6 6600 F05 402 Ω 402 Ω NETWORK ANALYZER INPUT 50 Ω COILCRAFT TTWB-16A 4:1 NETWORK ANALYZER SOURCE COILCRAFT TTWB-1010 1:1 50 Ω 53.6 Ω 388 Ω 388 Ω Differential and Common Mode Voltage Ranges The differential amplifiers inside the LT6600-10 contain circuitry to limit the maximum peak-to-peak differential voltage through the filter. This limiting function prevents excessive power dissipation in the internal circuitry and provides output short-circuit protection. The limiting function begins to take effect at output signal levels above 2VP-P and it becomes noticeable above 3.5VP-P. This is illustrated in Figure 6; the LTC6600-10 was configured with unity passband gain and the input of the filter was driven with a 1MHz signal. Because this voltage limiting takes place well before the output stage of the filter reaches the supply rails, the input/output behavior of the IC shown in Figure 6 is relatively independent of the power supply voltage. |
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