IF LOW NOISE AMPLIFIER/MIXER

www.DataSheet4U.com RF3334 0 Typical Applications • Cable Set Top Box • General Purpose Downconverter • Commercial and Consumer Systems IF LOW NOISE AMPLIFIER/MIXER Product Description The RF3334 is an IF LNA/Mixer suitable for downconversion of forward channel control data in a set-top box application. It consists of a single-ended 75Ω terminated LNA, followed by a differential gain control stage with 30dB of analog gain control and a double-balanced mixer. The mixer load is available via pins 10 and 11 should an external filter be required. The mixer output is connected to an IF amplifier that can be configured from 10dB to 40dB gain with an external resistor. The amplifier is capable of 6V pk-pk output into a 1kΩ load. -A- 2 PLCS 0.10 C A 0.05 C 4.00 SQ. 2.00 TYP 0.10 C B 2 PLCS 0.70 0.65 0.90 0.85 0.05 0.00 12° MAX 0.10 C B 2 PLCS -B-C- 1.87 TYP 3.75 SQ 0.10 C A 2 PLCS SEATING PLANE Shaded lead is pin 1. Dimensions in mm. 0.10 M C A B 0.60 0.24 TYP 0.35 0.23 Pin 1 ID 0.20 R 2.25 SQ. 1.95 0.75 TYP 0.50 0.65 Optimum Technology Matching® Applied Si BJT Si Bi-CMOS InGaP/HBT GaAs HBT SiGe HBT GaN HEMT GaAs MESFET Si CMOS SiGe Bi-CMOS Package Style: QFN, 16-Pin, 4x4 Features • 30dB RF Gain Control • 40dB IF Gain Control RFVCC GND LOB • 5dB Max. Noise Figure SSB • LNA Input Internally Matched to 75Ω 12 RFAGC 16 RFDEC 1 15 14 13 LO • Single 5V Supply RFIN 2 11 MIXLOAD GND 3 IF AMP 10 MIXLOADB Ordering Information 9 GND 6 7 IFOUT 8 IFOUTB RF3334 RF3334 PCBA LNA Mixer Fully Assembled Evaluation Board IFVCC 4 5 IFSET IFSETB Functional Block Diagram RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com Rev A5 031020 8-457 RF3334 Absolute Maximum Ratings Parameter Supply Voltage IF Input Level Operating Ambient Temperature Storage Temperature Rating -0.5 to 7.0 500 -40 to +85 -40 to +150 Unit VDC mVpp °C °C Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Parameter DC Specifications Supply Voltage Supply Current RFAGC Control Voltage RFAGC Input Impedance Specification Min. Typ. Max. 4.75 20 0.5 5 24 5.25 4.5 300 Unit V mA V kΩ Condition 0.5V=Minimum Gain 4.5V=Maximum Gain AC Specifications LNA+AGC+Mixer RF Frequency Range 0 to 700 MHz On-chip signal path is DC-coupled, minimum frequency depends on external AC coupling components. On-chip signal path is DC-coupled, minimum frequency depends on external AC coupling components. At 100MHz Defined by on-chip first-order low-pass filter Differential At 100MHz RFAGC=4.5V RFAGC=0.5V Maximum Gain LNA Input to Mixer Output LNA Input to Mixer Output SSB, Cascaded LNA, AGC & Mixer RF Input 3dB Bandwidth 700 MHz Ω MHz Ω dB dB dBµV(rms) dBµV(rms) dBµV(rms) dB MHz Ω dBuV MHz dB dB RF Input Impedance RF Input VSWR Mixer Output 3dB Bandwidth Mixer Output Impedance Mixer Output VSWR Maximum Gain Minimum Gain Output 1dB Compression Input IP3, Maximum Gain Input IP3, Minimum Gain Noise Figure 27 75 1.4 100 300 1.2 30 -2 90 78 79 5 0 to 800 75 1.6:1 LO LO Frequency Range LO Input Impedance LO Input VSWR LO Input Level LO Bandwidth LO Rejection to RF Input LO Rejection to Input of IF Amplifier Differential 80 800 50 65 IF Amplifier IF Frequency Range Input Impedance Output Impedance Differential Voltage Gain Gain Set Resistor=2500Ω Gain Set Resistor=140Ω Gain Set Resistor=5Ω IF 3dB Bandwidth Equivalent Input Noise Output Swing Output 1dB Compression Output IP3 0 to 120 4000 10 10 31 40 140 1.5 6 127 137 8 MHz Ω Ω dB dB dB MHz µVrms VP-P dBµV(rms) dBµV(rms) Differential Differential R1=1kΩ R1=1kΩ R1=1kΩ Gain Set=5Ω Gain Set=140Ω Into 1kΩ load, at 50MHz Into 1kΩ load, at 50MHz Into 1kΩ load, at 50MHz 8-458 Rev A5 031020 RF3334 Parameter Thermal ThetaJC Maximum Measured Junction Temperature at DC Bias Conditions 65 95 °C/W °C Specification Min. Typ. Max. Unit Condition VCC =5.25V, VRFAGC=4.5V, ICC =29mA, PDISS =154mW TAMB =+85°C Rev A5 031020 8-459 RF3334 Pin 1 Function RFDEC Description External decoupling capacitor for RF single-ended to differential converter. Interface Schematic VCC 100 Ω RFDEC 2 RF LNA Input, Internally matched to 75Ω. Should be AC-coupled. VBIAS RF 3 4 5 GND IFVCC IFSET Ground. 5V supply for IF section. IF Gain select. The resistance between this pin and pin 6 (IFSETB) determines the gain of the IF amplifier. Maximum gain is achieved by placing a short circuit between the pins. Larger values of resistance will reduce the IF gain according to the following equation where R is the value of resistance between pins 5 and 6. IFGain=20log(1600/(R=75))15. Complementary IF Gain select. IFSET IFSETB 6 IFSETB IFSET IFSETB 7 IFOUT IF Amplifier Output. Differential output of the IF amplifier. The differential load across this pin and pin 8 (IFOUTB) should be 1kΩ or greater for optimal performance. The differential output impedance across this pin and pin 8 in 10Ω. VBIAS VCC IF OUT 8 IFOUTB Complementary IF Amplifier Output. VCC VBIAS IF OUTB 9 10 GND MIXLOADB Ground. Complementary Mixer load. MIXLOAD MIXLOADB 11 MIXLOAD Differential output of the RF mixer. A resonant load should be applied to this pin and pin 10 (MIXLOADB) that will act as a bandpass filter at the desired IF frequency. VCC should be supplied to this pin via an inductor or a resistor. Use of a resistor will degrade intermodulation performance. MIXLOAD MIXLOADB 8-460 Rev A5 031020 RF3334 Pin 12 Function RFAGC Description RF Gain select voltage input. The voltage applied to this pin sets the gain of the RF amplifier. The voltage applied to this pin should be between 0.5V and 4.5V. The RF gain characteristic is such that 0.5V yields a gain of -2dB and 4.5V yields a gain of +30dB as measured from the input of the LNA to the output of the mixer stage. Differential LO Input. This pin and pin 14 (LOB) are the differential LO inputs. This input should be AC-coupled. The differential input impedance across pins 13 and 14 is 75Ω. The LO may be driven single ended but will require a higher drive level. If a single ended LO is applied, pin 14 should be AC-coupled to ground. Interface Schematic 100 kΩ RFAGC 10 kΩ VREF 13 LO LOB 300 Ω VBIAS 300 Ω LO 75 Ω 14 LOB Complementary LO Input. Should be AC-coupled. LOB 300 Ω VBIAS 300 Ω LO 75 Ω 15 16 GND GND RFVCC Paddle Ground. 5V supply for RF section. Backside of package should be connected to ground. Rev A5 031020 8-461 RF3334 Pin-Out RFVCC GND LOB 16 RFDEC 1 15 14 13 12 RFAGC LO 11 MIXLOAD 10 MIXLOADB 9 GND 8 IFOUTB RFIN 2 GND 3 IFVCC 4 5 IFSET 6 IFSETB 7 IFOUT 8-462 Rev A5 031020 RF3334 Application Schematic LOB LO VCC 10 nF 10 nF 1 kΩ RFAGC 10 nF + 1 uF 1 nF 10 pF 16 15 14 13 12 C 10 nF 1 L RFIN 10 nF 3 VCC 4 10 n 5 6 7 8 IF AMP 2 11 R L 10 C VCC 9 IFOUT IFOUTB R* Rev A5 031020 8-463 RF3334 Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) T1 50 Ω µstrip J2 LO TTWB-1-A R1 1 kΩ RFAGC C4 10 nF VCC + C1 1 uF C10 1 nF C2 10 nF 1 J3 RF IN 50 Ω µstrip 2 C3 10 nF 3 IF AMP C11 10 pF 16 15 14 13 12 C5 82 pF L1 120 nH R6 750 Ω L2 120 nH C8 82 pF 11 VCC 10 VCC C6 10 nF J1 J1-1 1 2 J1-3 3 CON3 VCC GND RF AGC 4 5 6 7 8 9 R3 475 Ω R2 140 Ω R4 475 Ω R5 100 Ω C7 10 n C9 10 n J4 IFOUT J5 IFOUTB 8-464 Rev A5 031020 RF3334 Evaluation Board Layout Board Size 2.0” x 2.0” Board Thickness 0.032”, Board Material FR-4, Multi-layer Rev A5 031020 8-465 RF3334 RF Input, Temp = +25°C 1.0 0.6 Swp Max 0.2GHz LO Input, Temp = +25°C 1.0 0.6 Swp Max 0.2GHz 2.0 0.8 2. 0 3.0 0.2 0.8 0. 4 10.0 10.0 0.2 0.4 0.6 0.8 1.0 2.0 3.0 4.0 5.0 0.2 0.4 0.6 0.8 1.0 2.0 3.0 4.0 5.0 0 0 -0 .4 .0 -2 -0. -0.8 Swp Min 0.05GHz -0. .0 -2 6 6 -1.0 -0.8 8-466 -1.0 Rev A5 031020 -3 .0 -3 . .4 -0 Swp Min 0.05GHz -4. 0 -5.0 -4 . 0 -5.0 -0.2 0 -0.2 -10.0 -10.0 0. 4 0 3. 4.0 5.0 4.0 5. 0 0.2 10.0 10.0 RF3334 35.0 LNA + AGC + Mixer Gain versus Control Voltage over Temperature (Freq = 100 MHz, VCC = 5.0 V) 90.0 88.0 86.0 LNA + AGC + Mixer + IF AMP - IIP3 versus Gain over Temperature (Freq = 100 MHz, VCC = 5.0 V) 30.0 25.0 84.0 15.0 IIP3 (dBµV) 20.0 Gain (dB) 82.0 80.0 78.0 76.0 10.0 5.0 -40°C 0.0 +25°C +85°C -5.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 70.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 74.0 72.0 -40°C +25°C +85°C RFAGC (V) Gain (dB) 35.0 SSB, Cascaded Noise Figure versus Gain over Temperature (Freq = 100 MHz, VCC = 5.0 V) -40°C +25°C RF Input VSWR versus Frequency Across Temperature 1.40 1.38 1.36 1.34 (VCC = 5.0 V) 30.0 +85°C 25.0 Noise Figure (dB) RF Input VSWR 20.0 1.32 1.30 1.28 1.26 1.24 -40°C +25°C +85°C 15.0 10.0 5.0 1.22 0.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 1.20 70.00 80.00 90.00 100.00 110.00 120.00 130.00 Gain (dB) Frequency (MHz) 1.75 LO Input VSWR versus Temperature Across Temperature (VCC = 5.0 V) 1.70 LO Input VSWR 1.65 1.60 1.55 -40°C +25°C +85°C 1.50 118.00 128.00 138.00 148.00 158.00 168.00 178.00 Frequency (MHz) Rev A5 031020 8-467 RF3334 PCB Design Requirements PCB Surface Finish The PCB surface finish used for RFMD’s qualification process is electroless nickel, immersion gold. Typical thickness is 3µinch to 8µinch gold over 180µinch nickel. PCB Land Pattern Recommendation PCB land patterns are based on IPC-SM-782 standards when possible. The pad pattern shown has been developed and tested for optimized assembly at RFMD; however, it may require some modifications to address company specific assembly processes. The PCB land pattern has b