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LT5522 Datasheet(PDF) 9 Page - Linear Technology |
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LT5522 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  LT5575 9 5575f BLOCK DIAGRAM PIN FUNCTIONS GND (Pins 1, 3, 4, 9, 11): Ground pin. RF (Pin 2): RF Input Pin. This is a single-ended 50Ω ter- minated input. No external matching network is required for the high frequency band. An external series capacitor (and/or shunt capacitor) may be required for impedance transformation to 50Ω in the low frequency band from 800MHz to 1.5GHz (see Figure 4). If the RF source is not DC blocked, a series blocking capacitor should be used. Otherwise, damage to the IC may result. VCC (Pins 6, 7, 8, 12): Power Supply Pins. These pins should be decoupled using 1000pF and 0.1µF capacitors. EN (Pin 5): Enable Pin. When the input voltage is higher than 2.0V, the circuit is completely turned on. When the enable pin voltage is less than 1.0V, the circuit is turned off. Under no conditions should the voltage at the EN pin exceed VCC + 0.3V. Otherwise, damage to the IC may result. If the Enable function is not needed, then the EN pin should be tied to VCC. LO (Pin 10): Local Oscillator Input Pin. This is a single- ended 50Ω terminated input. No external matching net- work is required in the high frequency band. An external shunt capacitor (and/or series capacitor) may be required for impedance transformation to 50Ω for the low frequency band from 800MHz to 1.5GHz (see Figure 6). If the LO source is not DC blocked, a series blocking capacitor must be used. Otherwise, damage to the IC may result. QOUT –, Q OUT + (Pins 13, 14): Differential Baseband Output Pins of the Q Channel. The internal DC bias voltage is VCC – 1.1V for each pin. IOUT –, I OUT + (Pins 15, 16): Differential Baseband Output Pins of the I Channel. The internal DC bias voltage is VCC – 1.1V for each pin. Exposed Pad (Pin 17): Ground Return for the Entire IC. This pin must be soldered to the printed circuit board ground plane. RF IOUT + LO GND 0 °/90° 16 IOUT – 15 QOUT + 14 QOUT – 13 LO BUFFERS LPF I-MIXER LPF Q-MIXER EXPOSED PAD 6 VCC BIAS 5 EN 1 GND 7 VCC 8 4 VCC 12 VCC GND 5575 BD 9 17 RF AMP RF AMP 2 3 11 10 |
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