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AM6012D 데이터시트(PDF) 7 Page - NXP Semiconductors |
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7 / 11 page Philips Semiconductors Linear Products Product specification AM6012 12-Bit multiplying D/A converter August 31, 1994 782 FREQUENCY MHz Figure 2. REFERENCE CONFIGURATION R14 R15 RIN CC IREF Positive reference VR+ 0V N/C 0.01 µF VR+/R14 Negative reference 0V VR– N/C 0.01 µF –VR–/R14 Lo impedance bipolar reference VR+ 0V VIN1 (VR+/R14) + (VIN/RIN)2 Hi impedance bipolar reference VR+ VIN N/C1 (VR+ – RIN) / R143 Pulsed reference4 VR+ 0V VIN (VR+/R14) + (VIN/RIN) No Cap NOTES: 1. The compensation capacitor is a function of the impedance seen at the +VREF input and must be at least 5pF x R14(eq) in kΩ. For R14 < 800Ω no capacitor is necessary. 2. For negative values of VIN, VR+ / R14 must be greater than –VIN max / RIN so that the amplifier is not turned off. 3. For positive values of VIN, VR+ must be greater than –VIN max so the amplifier is not turned off. 4. For pulsed operation, VR+ provides a DC offset and may be set to zero in some cases. The impedance at Pin 14 should be 800Ω or less. 5. For optimum settling time, decouple V– with 20 Ω and bypass with 22µF tantalum capacitor. 6. Reference current and reference resistor — there is a 1-to-4 scale factor between the reference current (IREF) and the full-scale output current (IFS). If VREF = +10V and IFS = 4mA, the value of the R14 is: R 14 + 4 x 10V 4 mA + 10kW R 14 + R 15 a. Reference Amplifier Biasing b. Reference Amplifier Frequency Response Minimum Size Compensation Capacitor (IFS = 4mA, IREF = 1.0mA) R14(EQ) (kΩ) CC (pF) 10 5 2 1 .5 50 25 10 5 0 NOTE: A 0.01 µF capacitor is recommended for fixed reference operation. 14 15 REFERENCE AMPLIFIER AM6012 18 19 FOR ALL INPUT CODES COMP 0.1 20 (NOTE 5) IO + IO = IFS IO IO V– V+ V– I15 IREF VIN RIN R14 R15 VR+ VR– 22 µF TANTALUM R15 = R14 = RIN VIN CC 0.1 6 4 2 0 –2 –4 –6 –8 .01 0.1 1.0 10 LARGE SIGNAL = 50% MODULATION OF 4mA FULL SCALE CURRENT SMALL SIGNAL = 1% MODULATION OF 2mA FULL SCALE CURRENT R14 (EQ) = 2kΩ CC = 10pF |
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