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LTC5541IUHPBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC5541IUHPBF Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  LTC5541 8 5541f PIN FUNCTIONS NC (Pin 1): This pin is not connected internally. It can be left floating, connected to ground or to VCC. RF (Pin 2): Single-Ended Input for the RF Signal. This pin is internally connected to the primary side of the RF input transformer, which has low DC resistance to ground. A series DC-blocking capacitor should be used to avoid damage to the integrated transformer. The RF input is impedance matched, as long as the selected LO input is driven with a 0dBm ±6dB source between 1.4GHz and 2GHz. CT (Pin 3): RF Transformer Secondary Center-Tap. This pin may require a bypass capacitor to ground. See the Applications Information section. This pin has an internally generated bias voltage of 1.2V. It must be DC-isolated from ground and VCC. GND (Pins 4, 10, 12, 13, 17, Exposed Pad Pin 21): Ground. These pins must be soldered to the RF ground plane on the circuit board. The exposed pad metal of the package provides both electrical contact to ground and good thermal contact to the printed circuit board. SHDN (Pin 5): Shutdown Pin. When the input voltage is less than 0.3V, the internal circuits supplied through pins 6, 8, 14, 18 and 19 are enabled. When the input voltage is greater than 3V, all circuits are disabled. Typical input current is less than 10μA. This pin must not be allowed to float. VCC2 (Pin 6) and VCC1 (Pin 8): Power Supply Pins for the LO Buffer and Bias Circuits. These pins are internally connected and must be externally connected to a regulated 3.3V supply, with bypass capacitors located close to the pin. Typical current consumption is 92mA. LOBIAS (Pin 7): This Pin Allows Adjustment of the LO Buffer Current. Typical DC voltage is 2.2V. LOSEL (Pin 9): LO1/LO2 Select Pin. When the input voltage is less than 0.3V, the LO1 port is selected. When the input voltage is greater than 3V, the LO2 port is selected. Typical input current is 11μA for LOSEL = 3.3V. This pin must not be allowed to float. LO1 (Pin 11) and LO2 (Pin 15): Single-Ended Inputs for the Local Oscillators. These pins are internally biased at 0V and require external DC blocking capacitors. Both inputs are internally matched to 50Ω, even when the chip is disabled (SHDN = high). VCC3 (Pin 14): Power Supply Pin for the LO Switch. This pin must be connected to a regulated 3.3V supply and bypassed to ground with a capacitor near the pin. Typical DC current consumption is less than 100μA. IFGND (Pin 16): DC Ground Return for the IF Amplifier. This pin must be connected to ground to complete the IF amplifier’s DC current path. Typical DC current is 100mA. IF– (Pin 18) and IF+ (Pin 19): Open-Collector Differential Outputs for the IF Amplifier. These pins must be connected to a DC supply through impedance matching inductors, or a transformer center-tap. Typical DC current consumption is 50mA into each pin. IFBIAS(Pin20):ThisPinAllowsAdjustmentoftheIFAmplifier Current. Typical DC voltage is 2.1V. |
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