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SL2035
High Performance Broadband Downconverter Preliminary Information
DS5117 Issue 2.1 October 1999
Features
G G G G G
Ordering Information
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. In application care should be taken to achieve symmetric balance to the IF outputs to maximise intermodulation performance.
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
G G G G
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. 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 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. 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.
Absolute Maximum Ratings
Supply voltage, VCC RF differential input voltage All I/O port DC offset Storage temperature Junction temperature Package thermal resistance Chip to ambient, JA Chip to case, JC 20*3V to 17V 2*5V 20*3 to VCC 10*3V 255C to 1150C 1150C 20C/W 80C/W
RFIN RFIN LO2
IF1 IF2
PRSC1 LO1
Figure 1 SL2035 block diagram
SL2035
IF2 NC GND GND GND GND RFIN RFIN
1 2 3 4 5 6 7 8
16 15 14
IF1 NC VCC/VCO LO2 LO1 VCC/VCO PRSC1 VCC/LNA
SL 2035
13 12 11 10 9
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 1000-1300 12 11 118 106 ,290 Units MHz dB dB dBV dBc dBc/Hz
Electrical Characteristics
Tamb = 240C to 185C, 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 Pin 9,11,14 Min. Typ. Max. 99 Units mA Conditions IF output pins 1 and 16 will be nominally connected to VCC through the differential balun load as in Figure 5
Input frequency range Composite peak input signal Input impedance Input return loss Input noise figure
7,8 7,8 7,8 7,8
1000 97 27 9
1300
10
Conversion gain
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
Operating condition only See Figure 3 dB See Note 1 221 dB TAMB = 27C, with input matching network 13 as in Figure 5. dB With differential load 12 Differential voltage gain to 50 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 dBV 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 cont...
MHz dBV
NOTES 1. Any two tones within RF operating range at 92dBV with output load as in Figure 5. 2. Use low side LO injection.
2
SL2035 Electrical Characteristics (continued)
Value Characteristic LO and harmonic leakage to RF input Fundamental 2nd harmonic LO Prescaler output swing LO Prescaler output impedance IF output impedance
6 PIN 7 3*3p 6 PIN 8 820
PIN 16 PIN 1 2p 325
Pin
Min.
Typ.
Max.
Units
Conditions
7,8 7,8 10 10 1,16
72 92 95 25 75
dBV dBV dBV
To device input To device input Into 50 load See Figure 4
Figure 3 Approximate model of RF input
Figure 4 Approximate model of IF output
Application Notes
Figure 5 shows the SL2035 in a typical downconverter application. 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 50 characteristic impedance. The network connected to the IF output pin 1 and pin 16 is a narrow band tuned balun centred typically on 40MHz. This matches the device output impedance of nominally 400 (balanced) to 50 (unbalanced). 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. 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 C4
VCC1
L7 C52 L6 C53 L3 C54 C11
J2 POWER 1 5V DEVICE SUPPLY 2 GND
VCC2 VCC3 L10 C15 C14 L8 IF2
1 2 16 15 14
C5
L11 C6
VCC3
VCC2 IF1 C17 VCC/VCO LO2 LO1 VCC/VCO PRSC1 VCC/LNA C3 C8 C10 C13 D1 C37 NC C19
S1 RESONATOR
C9
C23
GND GND GND SKT1 RFIN L5 C2 C1 GND RFIN RFIN
3 4 5 6 7 8
SL 2035
13 12 11 10 9
R10
SKT4 EXTERNAL VARACTOR DRIVE (REMOVE R9)
VCC1 C18
C21
R12
R9
C22
SKT2
130V NOTE: Refer to Table 1 for component values
C4 L9
C42 C31 R7 CP X1 C30 XTAL
1 2 3 4 5 6 7 8 16 15 14
R8
DRIVE VEE RF I/P RF I/P VCC ADC C43 P0 P1 R11 C24
T1 BCW31 30V
15V
REF/COMP 15V J3 SCL5 5V SDA5
3 4 5 6
J1 POWER 1 30V SYNTHESISER C34
2 3
ADDRESS SDA SCL P3 P2
SP 5659
13 12 11 10 9
GND 5V SYNTHESISER
5V C46 C41
I2C BUS
C47
C38
Figure 5 SL2035 upconverter application
4
SL2035
Component 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
Value/type 1nF 1nF 1 nF 10nF 56pF 100pF 100pF 100pF 10F 100nF 100nF 100pF 100nF 100nF 2pF 1nF 33nF 47pF 1nF 18pF 330nF 100nF 56pF NC 100nF
Component C41 C42 C43 C46 C47 D1 L3 L5 L6 L7 L8 L9 L10 L11 R7 R8 R9 R10 R11 R12 S1 T1 X1
Value/type 4*7F 3*3nF 100nF 100pF 100pF IT397 220nH 1*8nH 220nH 220nH 1H 220nH 680nH 680nH 15k 22k 15k 1k 4*7k 50 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
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