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LTC5590 Datasheet(PDF) 10 Page - Linear Technology |
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LTC5590 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LTC5592 10 5592f PIN FUNCTIONS RFA, RFB (Pins 1, 6): Single-Ended RF Inputs for Chan- nels A and B. These pins are internally connected to the primary sides of the RF input transformers, which have low DC resistance to ground. Series DC-blocking capaci- tors should be used to avoid damage to the integrated transformer when DC voltage is present at the RF inputs. The RF inputs are impedance matched when the LO input is driven with a 0±6dBm source between 1.7GHz and 2.5GHz and the channels are enabled. CTA, CTB (Pins 2, 5): RF Transformer Secondary Center- Tap on Channels A and B. These pins may require bypass capacitors to ground to optimize IIP3 performance. Each pin has an internally generated bias voltage of 1.2V and must be DC-isolated from ground and VCC. GND (Pins 3, 4, 7, 13, 15, 24, Exposed Pad Pin 25): 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. IFGNDB, IFGNDA (Pins 8, 23): DC Ground Returns for the IF Amplifiers. These pins must be connected to ground to complete the DC current paths for the IF amplifiers. Chip inductors may be used to tune LO-IF and RF-IF leakage. Typical DC current is 101mA for each pin. IFB+, IFB–, IFA–, IFA+ (Pins 9, 10, 21, 22): Open-Collector Differential Outputs for the IF Amplifiers of Channels B and A. These pins must be connected to a DC supply through impedance matching inductors, or transformer center-taps. Typical DC current consumption is 50.5mA into each pin. IFBB, IFBA (Pins 11, 20): Bias Adjust Pins for the IF Amplifiers. These pins allow independent adjustment of the internal IF buffer currents for channels B and A, respectively. The typical DC voltage on these pins is 2.2V. If not used, these pins must be DC isolated from ground and VCC. VCCB and VCCA (Pins 12, 19): Power Supply Pins for the LO Buffers and Bias Circuits. These pins must be con- nected to a regulated 3.3V supply with bypass capacitors located close to the pins. Typical current consumption is 99.5mA per pin. ENB, ENA (Pins 14, 17): Enable Pins. These pins allow Channels B and A, respectively, to be independently en- abled. An applied voltage of greater than 2.5V activates the associated channel while a voltage of less than 0.3V disables the channel. Typical input current is less than 10μA. These pins must not be allowed to float. LO (Pin 16): Single-Ended Local Oscillator Input. This pin is internally connected to the primary side of the LO input transformer and has a low DC resistance to ground. Series DC-blocking capacitors should be used to avoid damage to the integrated transformer when DC voltage present at LO input. The LO input is internally matched to 50Ω for all states of ENA and ENB. ISEL (Pin 18): Low Power Select Pin. When this pin is pulled low (<0.3V), both mixer channels are biased at the normal current level for best RF performance. When greater than 2.5V is applied, both channels operate at reduced current, which provides reasonable performance at lower power consumption. This pin must not be allowed to float. |
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Similar Description - LTC5590 |
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