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AD9901KQ bảng dữ liệu(PDF) 4 Page - Analog Devices |
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4 / 8 page AD9901 REV. B –4– TTL/CMOS MODE FUNCTIONAL PIN DESCRIPTIONS GROUND Ground connections for AD9901. Connect all grounds together and to low impedance ground plane as close to the device as possible. +VS Positive supply connection; nominally +5.0 V for TTL operation. BIAS Connect to +VS (+5 V) for TTL operation. VCO INPUT TTL compatible input; normally connected to the VCO output signal. VCO INPUT and REFERENCE INPUT are equivalent to one another. OUTPUT The noninverted output. In TTL/CMOS mode, the output swing is approximately +3.2 V to +5 V. RSET External RSET connection. The current through the RSET resistor is equal to the maxi- mum full-scale output current. RSET should be connected to ground through an external resistor in TTL mode. ISET = 0.47 V/RSET = ILOAD (max). OUTPUT The inverted output. In TTL/CMOS mode, the output swing is approximately +3.2 V to +5 V. REFERENCE TTL compatible input, normally connected INPUT to the reference input signal. The VCO INPUT and the REFERENCE INPUT are equivalent. REG RSET AD9901 R1 OUTPUT R2 +VS +VS REFERENCE OUTPUT OUTPUT +VS VCO INPUT BIAS +VS +VS R3 Figure 1. TTL Mode (Based on DIP Pinouts) ECL MODE FUNCTIONAL PIN DESCRIPTIONS –VS Negative supply connection, nominally –5.2 V for ECL operation. BIAS Connect to –5.2 V for ECL operation. VCO INPUT Inverted side of ECL compatible differential input, normally connected to the VCO output signal. VCO INPUT Noninverted side of ECL-compatible differential input, normally connected to the VCO output signal. OUTPUT The noninverted output. In ECL mode, the output swing is approximately 0 V to –1.8 V. GROUND Ground connections for AD9901. Connect all grounds together and to low-impedance ground plane as close to the device as possible. RSET External RSET connection. The current through the RSET resistor is equal to the maxi- mum full-scale output current. RSET should be connected to –VS through an external resistor in ECL mode. ISET = 0.47 V/RSET = ILOAD (max). OUTPUT The inverted output. In ECL mode, the out- put swing is approximately 0 V to –1.8 V. REFERENCE Noninverted side of ECL-compatible INPUT differential input, normally connected to the reference input signal. The VCO INPUT and the REFERENCE INPUT are equivalent to one another. REFERENCE Inverted side of ECL-compatible differential INPUT input, normally connected to the reference input signal. The VCO INPUT and the REFERENCE INPUT are equivalent. REG RSET AD9901 R1 OUTPUT R2 –VS REFERENCE INPUT OUTPUT VCO INPUT BIAS R3 REFERENCE INPUT –VS –VS VCO INPUT –VS Figure 2. ECL Mode (Based on DIP Pinouts) |
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