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SL1935 Dataheets PDF



Part Number SL1935
Manufacturers ETC
Logo ETC
Description Single Chip Synthesized Zero IF Tuner
Datasheet SL1935 DatasheetSL1935 Datasheet (PDF)

SL1935 Single Chip Synthesized Zero IF Tuner April 2004 Features • • • • • • • • • Single chip synthesised tuner solution for quadrature down conversion, L-band to Zero IF. DVB compliant, operating dynamic range -70 to -20dBm. Compatible with DSS and DVB variable symbol rate applications. Selectable baseband path, programmable through I2C bus. Excellent quadrature balance up to 30MHz baseband Excellent immunity to spurious second harmonic (RF and LO) mixing effects. Low oscillator phase noise .

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SL1935 Single Chip Synthesized Zero IF Tuner April 2004 Features • • • • • • • • • Single chip synthesised tuner solution for quadrature down conversion, L-band to Zero IF. DVB compliant, operating dynamic range -70 to -20dBm. Compatible with DSS and DVB variable symbol rate applications. Selectable baseband path, programmable through I2C bus. Excellent quadrature balance up to 30MHz baseband Excellent immunity to spurious second harmonic (RF and LO) mixing effects. Low oscillator phase noise and reradiation. High output referred linearity for low distortion and multi channel application. Integral fast mode compliant I2C bus controlled PLL frequency synthesiser, designed for high comparison frequencies and low phase noise performance. Buffered crystal output for clocking QPSK demodulator. ESD protection (Normal ESD handling procedures should be observed). Ordering Information SL1935D/KG/NP1P (Tubes) 36 pin SSOP SL1935D/KG/NP1Q (Tape and Reel) 36 pin SSOP Description The SL1935 is a complete single chip I2C bus controlled Zero IF tuner and operates from 950 to 2150MHz. It includes an on-board low phase noise PLL frequency synthesiser and low noise LNA/AGC. The SL1935 is intended primarily for application in digital satellite Network Interface Modules and performs the complete tuner function. The device contains all elements necessary, with the exception of local oscillator tuning network and crystal reference, to produce a high performance I(n-phase) & Q(uadrature) downconversion tuner function. Due to the high signal handling design the device does not require any front end tracking filters. The SL1935 includes selectable baseband signal paths, allowing application with two externally definable filter bandwidths, facilitating application in variable symbol rate and simulcast systems. The SL1935 is optimised to interface with the VP310 (ADC/QPSK/FEC) Satellite Channel Decoder, available from Zarlink Semiconductor and offers a full front end solution. • • Applications • • Satellite receiver systems. Data communications systems. XTALCAP XTAL SDA SCL BUFREF VCCD VCC RF RFB VCC IFIA IFIB VCC OFIA OFIB VEE IOUT ADD 1 36 18 19 PUMP DRIVE PORT P0 VEE TANKS TANKSB VEE TANKV TANKVB VEE IFQA IFQB VCC OFQA OFQB VEE QOUT AGCCONT Figure 1. Pin connections 1 Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 2003 - 2004, Zarlink Semiconductor Inc. All Rights Reserved. SL1935 RFB RF 8 9 AGCCONT 19 23 OFQA AGC Sender 22 OFQB 26 IFQA 25 IFQB 20 QOUT 90deg BS 17 IOUT RF Section VCC 7,10,13,24 VCCD 6 VEE 16,21,27,30,33 TANKV 29 TANKVB 28 VCOV TANKS 32 TANKSB 31 VCOS 15 bit Programmab le Divider Fpd Charge Pump Divide by 2 RF section PLL section Frequency Agile Phase Splitter 11 IFIA 12 IFIB 0deg 14 OFIA 15 OFIB 36 PUMP 35 DRIVE PLL Section VS BS SDA 3 SCL 4 ADD 18 REF OSC I2C Bus Interface 34 POR T P0 Fpd/2 Reference Divider 5 BUFREF Fcomp XTAL 2 XTALCAP 1 Figure 2. Block diagram 2 SL1935 Table 1. Quick Reference Data Characteristic Value Units MHz dBm dB dB dB dBm dBm dBm V dB deg dB dBc/Hz dBm dBc dBc MHz dBc/Hz 950 to 2150 Operating range -75 to -15 Input dynamic range 10 VSWR with input match Input NF 10 @ -70dBm operating sensitivity 15 @ -60dBm operating sensitivity +5 IPIP3 @ -20dBm operating sensitivity +20 IPIP2@ -20dBm operating sensitivity -5 IPP1dB@ -20dBm operating sensitivity 2.0 Baseband output limit voltage 0.2 Gain match up to 22MHz 0.7 Phase match up to 22MHz 1 Gain flatness up to 30MHz Local oscillator phase noise -80 SSB at 10kHz offset <-70 In band LO reradiation from RF input -55 LO second harmonic interference level at input level of -20dBm per carrier -35 LNA second harmonic interference level at input level of -25dBm per carrier 4 PLL maximum comparison frequency -152 PLL phase noise at phase detector Note: ` 6dB interstage filter loss assumed in external base band paths. ` dBm assumes 75Ω characteristic impedance. Functional Description General The SL1935 is a complete wideband direct conversion tuner incorporating an on board frequency synthesiser and LNA/AGC, optimised for application in digital satellite receiver systems. The device offers a highly integrated solution to a satellite tuner function, incorporating an I2C bus interface controller, a low phase noise PLL frequency synthesiser and all tuner analogue functionality. The analogue blocks include the reference oscillator, consisting of two independent oscillators, a phase splitter, RF preamplifier with AGC facility, channel mixers and baseband amplifiers incorporating two selectable baseband paths, allowing for two externally definable bandwidths. In this application two varactor tuned tanks, a reference crystal and baseband filtering components are required to complete the tuner system. A buffered crystal frequency output is available to clock the QPSK demodulator and powers up in the active state. The I2C bus interface controls the frequ.


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