SL2035 High Performance Broadband Downconverter Preliminary Information DS5117 Issue 2.1 October 1999 Features ● ● ● ● ● Ordering Information Single Chip Broadband Solution Wide Dynamic Range RF Input Low Phase Noise Balanced Internal Local Oscillator High Frequency Range: 1 to 1·3 GHz ESD Protection 2kV min., MIL-STD-883B Method 3015 Cat.1 (Normal ESD handling procedures should be observed) Applications ● ● ● ● Double Conversion Tuners Digital Terrestrial Tuners Data Transmit Systems Data Communications Systems The SL2035 is a bipolar, broadband wide dynamic range mixer oscillator, optimised for applications as the downconverter in double conversion tuner systems. It also has application in any system where a wide dynamic range broadband frequency converter is required. SL2035/IG/MP1S (Tubes) SL2035/IG/MP1T (Tape and Reel) The output of the preamplifier is fed to the mixer section which is optimised for low radiation application. In this stage the RF signal is mixed with the local oscillator frequency, which is generated by an on-chip oscillator. The oscillator block uses an external tuneable network and is optimised for low phase noise. A typical application is shown in Figure 5. This block also contains a buffer-amplifier to interface with an external PLL to allow for frequency synthesis of the local oscillator. The IF output can be loaded either differentially or singleended. It is recommended that the differential load as in Figure 5 is applied as this gives best noise performance. If the output is loaded single-ended the noise figure will be degraded. The approximate model of the IF output is shown in Figure 4. The SL2035 is a single chip containing all necessary active circuitry and simply requires an external tuneable resonant network for the local oscillator. The block diagram is shown in Figure 1 and pin connections are shown in Figure 2. In application care should be taken to achieve symmetric balance to the IF outputs to maximise intermodulation performance. In normal application the signal from the high IF output is connected to the RFIN and RFIN inputs. The RF input preamplifier of the device is designed for low noise figure within the operating region and for high intermodulation distortion intercept so offering good signal to noise plus composite distortion spurious performance. Absolute Maximum Ratings The preamplifier also provides gain to the mixer section and back isolation from the local oscillator section. The approximate model of the RF input is shown in Figure 3. Supply voltage, VCC RF differential input voltage All I/O port DC offset Storage temperature Junction temperature Package thermal resistance Chip to ambient, θJA Chip to case, θJC RFIN IF1 RFIN IF2 LO2 PRSC1 LO1 Figure 1 SL2035 block diagram 20·3V to 17V 2·5V 20·3 to VCC 10·3V 255°C to 1150°C 1150°C 20°C/W 80°C/W SL2035 IF2 1 16 IF1 NC GND 2 15 3 14 NC VCC/VCO GND GND 4 GND RFIN RFIN 12 LO2 LO1 6 11 VCC/VCO 7 10 8 9 PRSC1 VCC/LNA 5 SL 2035 13 MP16 Figure 2 Pin connections - top view Quick Reference Data All data applies with circuit component values given in Table 1 Characteristic RF input operating frequency range Input noise Figure, SSB Conversion gain IIP3 input referred P1dB input referred LO phase noise at 10 kHz offset, fRF 1 to 1·3GHz, application as in Figure 5 Value Units 1000-1300 12 11 118 106 ,290 MHz dB dB dBµV dBc dBc/Hz Electrical Characteristics Tamb = 240°C to 185°C, VCC = 5V 65%, VEE = 0V. These characteristics are guaranteed by either production test or design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated. Value Characteristic Supply current Input frequency range Composite peak input signal Input impedance Input return loss Input noise figure Conversion gain Pin Min. Typ. 9,11,14 7,8 7,8 7,8 7,8 1000 97 27 9 10 8 11 Gain variation within channel Through gain 116 IIP3 LO operating range 12,13 0·9 295 LO phase noise, 10kHz offset LO phase noise floor 30 IF output frequency range 1,16 118 290 Max. Conditions Units 99 mA 1300 MHz dBµV IF output pins 1 and 16 will be nominally connected to VCC through the differential balun load as in Figure 5 Operating condition only See Figure 3 dB See Note 1 221 dB TAMB = 27°C, with input matching network 13 as in Figure 5. dB With differential load 12 Differential voltage gain to 50Ω load on 14 output of impedance transformer as in Figure 5 dB Channel bandwidth 8MHz within operating 0·5 frequency range dB 995-1305MHz 220 125 dBµV See Note 1 GHz Application as Figure 5. See Note 2 1·4 288 dBc/Hz Application as Figure 5 TBA dBc/Hz Application as Figure 5 MHz Compatible with all standard IF frequencies, 60 determined by application NOTES 1. Any two tones within RF operating range at 92dBµV with output load as in Figure 5. 2. Use low side LO injection. 2 cont… SL2035 Electrical Characteristics (continued) Value Characteristic Pin LO and harmonic leakage to RF input Fundamental 2nd harmonic LO Prescaler output swing LO Prescaler output impedance IF output impedance 7,8 7,8 10 10 1,16 Min. Typ. Max. 72 92 95 25 75 Units dBµV dBµV dBµV Ω Ω Conditions To device input To device input Into 50Ω load See Figure 4 6 PIN 1 PIN 7 3·3p 6 2p 820 PIN 8 Figure 3 Approximate model of RF input 325 PIN 16 Figure 4 Approximate model of IF output Application Notes Figure 5 shows the SL2035 in a typical downconverter application. This matches the device output impedance of nominally 400Ω (balanced) to 50Ω (unbalanced). The network connected to RF input pin 7 and pin 8 is to improve the matching between the device input and the source. The source would normally be from the 1·1MHz IF output of the upconverter (SL2030) via passive BPF and gain stage all designed for 50Ω characteristic impedance. The network connected to the LO pin 12 and pin 13 is a varactor diode loaded resonant microstrip line resonator. Fine adjustment of the tuning range can be achieved by physically moving C19 (see Figure 5) closer to the LO pins. This extends the bottom end of the tuning range. The network connected to the IF output pin 1 and pin 16 is a narrow band tuned balun centred typically on 40MHz. It is important to provide good decoupling on the 5V supplies and to use a layout which provides some isolation between the RF, IF and LO ports. 3 SL2035 IF OUT SKT3 C52 C4 L6 VCC2 VCC3 C5 L11 L10 C15 GND GND GND SKT1 GND C1 RFIN RFIN RFIN L5 L3 C54 C11 C14 L8 IF2 C53 VCC3 C6 J2 POWER 1 5V DEVICE SUPPLY 2 GND L7 VCC1 VCC2 1 16 2 15 3 14 4 SL 2035 5 C17 7 10 8 9 C23 VCC/VCO R10 C19 LO1 12 11 C9 LO2 13 6 C2 IF1 S1 RESONATOR SKT4 EXTERNAL VARACTOR DRIVE (REMOVE R9) VCC/VCO C10 PRSC1 C13 VCC/LNA D1 VCC1 C3 C18 C37 NC C8 C21 R9 R12 C22 SKT2 130V C4 NOTE: Refer to Table 1 for component values L9 C42 R8 C31 R7 CP X1 C30 XTAL REF/COMP 15V ADDRESS SDA J3 SCL5 3 SCL 5V 4 P3 5 P2 SDA5 1 16 2 15 3 14 4 5 6 SP 5659 13 12 11 7 10 8 9 DRIVE T1 BCW31 VEE RF I/P RF I/P 30V C24 5V ADC C43 C46 P0 R11 6 I2C BUS C47 C38 Figure 5 SL2035 upconverter application 4 C34 2 GND 3 5V SYNTHESISER 15V VCC P1 J1 POWER 1 30V SYNTHESISER C41 SL2035 Component Value/type Component Value/type C1 C2 C3 C4 C5 C8 C9 C10 C11 C13 C14 C15 C17 C18 C19 C21 C22 C23 C24 C30 C31 C34 C36 C37 C38 1nF 1nF 1 nF 10nF 56pF 100pF 100pF 100pF 10µF 100nF 100nF 100pF 100nF 100nF 2pF 1nF 33nF 47pF 1nF 18pF 330nF 100nF 56pF NC 100nF C41 C42 C43 C46 C47 D1 L3 L5 L6 L7 L8 L9 L10 L11 R7 R8 R9 R10 R11 R12 S1 T1 X1 4·7µF 3·3nF 100nF 100pF 100pF IT397 220nH 1·8nH 220nH 220nH 1µH 220nH 680nH 680nH 15kΩ 22kΩ 15kΩ 1kΩ 4·7kΩ 50Ω Resonator (Figure 6) BCW31 4MHz crystal Table 1 Component values for Figure 5 0·5 0·5 1·5 1·0 1·5 0·5 3 3 3 Figure 6 Microstrip resonator (dimensions are in mm) 5 http://www.mitelsemi.com World Headquarters - Canada Tel: +1 (613) 592 2122 Fax: +1 (613) 592 6909 North America Tel: +1 (770) 486 0194 Fax: +1 (770) 631 8213 Asia/Pacific Tel: +65 333 6193 Fax: +65 333 6192 Europe, Middle East, and Africa (EMEA) Tel: +44 (0) 1793 518528 Fax: +44 (0) 1793 518581 Information relating to products and services furnished herein by Mitel Corporation or its subsidiaries (collectively “Mitel”) is believed to be reliable. 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