CXA3050

CXA3050M NICAM and SMATV RF MODULATOR/PLL Description Fully synthesized I2C controlled UHF/VHF TV RF Modulator compatible with PAL and NTSC video formats. Features • Minimal adjustment of external components • For use on VHF and UHF TV Frequencies • Video RF carrier frequency programmable in 125kHz steps • Accepts NICAM 6.552MHz QPSK input signal • Accepts FM Stereo input signal • I2C control of: a. Video RF Carrier Frequency b. Sound Carrier Frequency c. Modulation Depth (±2% Typ.) d. FM Deviation (±8% Typ.) e. P/S ratio (±1dB Typ.) f. Nicam output enable to sleep g. Video RF carrier enable to sleep • On chip Regulator 3.1V Block Diagram Analog GND Analog VCC NICAM-in OSC VCC 24 pin SOP (Plastic) Structure Bipolar silicon monolithic IC Applications • PAL and NTSC System VCR • Satellite Receiver • Set Top Box • SMATV Recommended Operating Voltages (Ta = 25°C) • Supply voltage VCC 5.0 ± 0.5 V • Supply for VCO Varactor 30 ± 0.5 V • Operating Temperature –10 to +80 °C RF-OUT OSC GND OSC4 OSC1 OSC2 PDout 14 PLL 11 OSC3 24 23 22 21 20 19 18 17 16 15 13 AMP NICAM MIXER VIDEO MIXER AMP VCO AMP TPSG W/C-CLAMP FM-OSC REG PLL OSC PLL I2C-Interface 1 2 3 4 5 6 7 8 9 10 12 Vreg Digital-VCC Mod-adj Digital GND Audio-Loop filter Video-in Audio-in SCL Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. FM-Tank –1– SDA Xtal NC EF E96331A66-ST Multi-standard RF Modulator Audio Loop Audio Filter Tank SMATV Nicam in Analog VCC Ground Digital VCC Digital Ground Audio in NTSC Amp FM Mod PLL B RF Amp Mixer and Adder P/S control NICAM Mixer Switch Audio in PAL 62.5kHz RF Output A B Modulation depth Video in video limiter Modulation depth Video clamp Buffer ×2 OSC C D A Loop Filter Loop filter B –2– divide 8 Memory Latch CCT divide M Phase detector Regulator V Reg SDA I2C divide 25 4MHz OSC XTAL 4MHz B A 62.5kHz 250kHz SCL B 4MHz CXA3050M Fig. 1 CXA3050M Functional Description of RF Modulator System A block diagram of the RF modulator is shown in Fig. 1. The composite video signal passes through an amplitude limiting circuit and a digitally controlled modulation depth adjustment circuit. By means of three allocated I2C control bits it is possible to adjust the modulation depth from a nominal 74% to 86% in 2.0% steps. Modulation depth can also be controlled externally by addition of an external resistor on pin3. The video signal is then passed through to the mixer. In the mixer stage, both the video composite signal and FM sound carrier amplitude modulate the RF carrier from the UHF OSC, and the issuing signal is fed to the output via an RF amplifier. The audio signals enter the chip via pin4. The FM Voltage Controlled Oscillator is band-switched to the approximate centre frequencies of the four sound carrier frequencies 4.5MHz (NTSC) or 5.5, 6.0, 6.5MHz (PAL). The required correct audio carrier frequency is fine tuned by the adjustment of fsound via I2C, where upon the FM phase locked loop will lock the VCO onto the exact centre frequency. Minimum distortion of the FM signal occurs when the centre frequency of the oscillator coincides with a mid-rail control voltage (to 2.0V). Hence fine adjustment capacitors are also integrated on the chip, which tag into account any capacitance variations from one batch to another. This is achieved by fine adjustment of Delta fsound via I2C control. The design of the FM modulator eliminates the need for an external varactor. The amplitude of the FM signal is varied via I2C by a digitally controlled logarithmic gain stage, which controls the picture to sound power ratio (P/S). This signal is then fed into the RF amp. Hence at the RF output the P/S ratio can be programmed in 1dB steps between the range 10dB and 17dB (see Electrical Characteristics). Audio sensitivity can be programmed in 8% steps between the range –32% and +24%. The UHF is phase locked to the reference frequency by means of the UHF phase locked loop. The VCO output passes through a prescaler (≈8) followed by an I2C controlled programmable divider (≈M), and then phase compared with that of a reference signal at 15.625kHz. The reference signal is derived from a 4MHz crystal oscillator feeding a –256 divider. The UHF oscillator covers the frequency range 471MHz to 855MHz in frequency steps of 125kHz. This is adequate for the UHF NTSC and PAL TV channels (471.25MHz (CH21) to 855.25MHz (CH69)). By adjustment of the external components around the oscillator and some adjustment to output matching the RF modulator can also achieve range of frequencies in the VHF range. The Nicam input (pin 22) accepts the 6.522MHz Nicam signal subcarrier QPSK at 728K bits/s data. This is then buffered and feed into a separate mixer (controlled via VCO). This then feeds to the RF amp with the composite video and audio. The I2C control will switch the Nicam signal output off or on. –3– CXA3050M I2C Interface Data Format Modulator Address Data 1 Data 2 Data 3 Data 4 1 PD M12 M4 X 1 ADJ1 M11 M3 NIC 0 ADJ0 M10 M2 FM2 0 S1 M9 M1 FM1 1 S0 M8 M0 FM0 0 over mod M7 MD2 PS2 0 X M6 MD1 PS1 R/W X M5 MD0 PS0 ask ask ask ask ask Sound Carrier Course Adjust S1 0 0 1 1 S0 0 1 0 1 Sound Carrier Frequency 4.5MHz 5.5MHz 6.0MHz 6.5MHz TV System (Pre-emphasis) NTSC PAL PAL PAL Sound Carrier Fine Adjust ADJ1 0 0 1 1 ADJ0 0 1 0 1 df Adjust –f Normal +f +f on chip capacitance 6.4pF 3.2pF 1.6pF 0 1 bit 1 bit 13 bits 2 bits 2 bits 3 bits 3 bits 3 bits 1 bit PD RF Power on (RF Amp & OSC) OVM Over Modulation Test M12–MO Main divider control data S1–S0 Sound carrier frequency selection ADJ1–ADJ0 Sound carrier frequency adjust (0 to 6.4RF) MD2–MD0 Modulation Depth PS2–PS0 Picture/Sound control FM FM deviation adjust NIC Nicam Enable M12 MO Main UHF PLL Divider MSB LSB 8191 to 2 Video Carrier frequency calculated from = 125 (M + 2) kHz –4– CXA3050M Software Application Notes The minimum requirement to drive the CXA3050 and I2C bus drive is a 386/486 with 4M bytes hard disk space, 16MHz clock speed and running DOS5.00 or above. Insert the disc into the drive and type TESTS and at the prompt type iic. At this there should appear a single list of user friendly functional tests that can be changed by keyboard manipulation. As an aid the test list is written below. Note Page up increments the status, page down decrements the status. Function RF Output Power Delta Sound Nominal Status 1/0 1 Comments Turns RF Amp, OSC on/off Fine tune audio carrier Course adjust for 4.5MHz (0) 5.5MHz (1) 6.0MHz (2) 6.5MHz (3) Check listing on page 10 for frequency to hex conversation Ranges mod depth from 72% to 86%, 80% (4) Sensitivity adjustable Programmable in 8 steps of 1dB Nicam Mixer on Increase Video modulation ratio Fsound 0 Frequency mode Mod depth FM Deviation P/S Ratio Nicam on/off Over Mod on/off 2 to 8191 4 4 4 1/0 1/0 –5– CXA3050M Pin Description Pin No. Reference Pin Voltage Typical DC Equivalent circuit Vcc Description 1 Video-in 2.5V 1 Video input Vcc 2 Vreg 3.1V 2 Chip voltage supply regulator MIXER FMOSC 3 Mod-Adj 2.5V 3 External Adjust Mod depth. 4 Audio-in 10mA 4 Audio input 5 5 FM-Tank 4.0V Sound Carrier oscillator tank –6– CXA3050M Pin No. Reference Pin Voltage Typical DC Equivalent circuit Vcc Description 6 AudioLoop filter 2.02V 6 Sound Carrier FM tank loop filter. See page 2 for set up note Vcc 8 Xtal 1.5V 8 4MHz input crystal frequency 10 SCL 5/0 V 10 I2C Clocking signal input 11 11 SDA 5/0 V I2C Data signal input 13 EF 0.7V 13 Charge pump output –7– CXA3050M Pin No. Reference Pin Voltage Typical DC Equivalent circuit Description 14 14 PDout 2.1V Phase detector output 15 16 17 18 19 20 OSC GND OSC1 OSC2 OSC3 OSC4 OSC VCC 0V 2.5V 1.7V 1.7V 2.5V 5V 19 18 17 16 20 VCO Ground UHF OSC 15 Oscillator supply Voltage 5V 22 22 Nicam-in 2V NICAM or FM carrier input 24 MIXER 24 RF-OUT 3.4V RF output. Must be terminated with 75Ω. Application Circuit Notes 1. RF output pin 24 should be connected to a 75Ω load in oder to measure accurate input level. Also note pin 24 has 2.7kΩ to GND. The output is measured using a spectrum analyzer. 2. After turning the device on, tune the variable inductor FM Tank so at the 6.5MHz setting (set by I2C control) the voltage on pin 6 should read 2.02V. Set Fsound = 3 Delta Fsound = 1 –8– CXA3050M Specifications Parameter Operating temperature range Modulation Index Diff. Gain 80 to 87.5% modulation Diff. Gain 80 to 87.5% modulation Deviation range (audio) NICAM input level NICAM input resistance Picture/sound ratio adj Video modulation adj Audio FM sensitivity Picture/Sound ratio Inter carrier accuracy New Specification –10 to 80°C 77.5 to 90% ±6.5% ±6.5 degree ±10kHz to ±100kHz 79dBµV 1kΩ 1dB × 7steps 2% × 7steps 8% × 7steps 1dB × 7steps ±1kHz Parameter Current consumption Full operation VCC = 5.0V DC Supply operating range Operating temperature range Input level Output level Input resistance Bit error rate Eye-height degradation Analog digital OSC Condition Min. 40 20 9.6 4.5 –10 Typ. 50 25 12 5.0 Max. 61.3 30.6 14.6 7 75 Unit mA mA mA Vdc °C dBµV 79 Conversion, Loss = 30dB –20 –22 1 10e–9 10e–6 10 –24 dBc KΩ % –9– CXA3050M RF Characteristics Parameter Output impedance Output return loss RF Output level RF Frequency respone Picture/Sound ratio VHF1 Frequency range VHF2 Frequency range UHF Frequency range 1 UHF Frequency range 2 RF Accuracy Inter-carrier frequency range Inter-carrier accuracy RF Carrier phase noise Sound carrier phase noise Hum modulation Chroma beat C/N Ratio RF Harmonics Sub-carrier harmonics NICAM Beat Reference spurious frequency. Spurious output level 15.625kHz –60 1/2 Video band offset –78 –63 4.5, 5.5, 6.0, 6.5 4.5, 5.5, 6.0, 6.5 10kHz offset frequency 10kHz offset frequency 4.5 0 –84.7 –84.7 Using attached application 700MHz 75Ω termination Using attached application 10 50 170 470 670 –7 79 ±2.5 ±1 17 120 230 860 800 ±50 6.5 ±1 –80 –80 –60 –65 –60 –15 –60 –65 –55 –65 Condition Min. Typ. 75 Max. Unit Ω dB dBµV dB dBc MHz MHz MHz MHz kHz MHz kHz dBc/Hz dBc/Hz dB dBc dB dBc dBc dBc dBc dBc – 10 – CXA3050M Video Characteristics Parameter Input resistance Input voltage % Modulation Clipping I2C control index Modulation flatness Modulation Modulation stability by temperature Field time distortion Line time distortion S/N K Factor Video frequency response Weighted With 2T pulse Per standard 0 7 steps Band Limited (46CH to 60CH) 0.55p-p input (mod Adja) mp (Ta = –10 to 80°C) –mp (Ta = 25°C) 0 0 0.5 0.5 73 80 2 80% Modulation Condition Min. 30 Typ. 100 0.55 97 ±0.4 ±1.4 87 ±3 2 2 –60 2 ±0.5 Max. Unit KΩ Vp-p % % % % % IRE IRE dB % dB Audio Characteristics Parameter Input voltage Input resistance Deviation range Audio distribution 4.5MHz System M 4.5MHz ± 25kHz = 100% = 0dB System B/G 5.5MHz ± 50kHz = 100% = 0dB System I 6MHz ± 50kHz = 100% = 0dB System D/K 6.5MHz ± 50kHz = 100% = 0dB Audio SNR Harmonic distortion Frequency response FM Hum and noise Quasi-Parallel, Detection 50 to 100%, Deviation 50 to 15kHz 25 to 75kHz, Deviation –1 Condition @50kHz, Deviation Min. 0.1 20 ±10 0 0.5 0.33 0.404 0.404 –60 1 +1 ±5 ±100 ±15 Typ. Max. Unit Vp-p KΩ kHz % kHz/mV kHz/mV kHz/mV kHz/mV dB % dB kHz Deviation sensitivity – 11 – Application Circuit 1 GND GND RF OUT C11 22pF C21 1nF C19 220pF C22 1nF R11 20k 21 20 16 19 18 17 15 14 13 C24 0.01µF Q1 C27 20pF C13 220pF C14 6pF C16 2pF C18 6pF 1T363 R10 330 L2 25nH R8 20k C25 1nF C23 0.047µF R12 300 R16 56k GND NICAM VCC Analog C7 1nF R9 20k R6 10 C6 22pF VCC OSC C1 22pF R1 2.7k R2 75 C5 1nF P1 24 23 22 EF OSC4 OSC2 RFOUT A-GND VCO3 OSC1 NICAM-IN OSC-VCC ANALOG-V OSC-GND PDOUT R13 200 C26 1nF R15 2k C28 1nF VREG AUDIO ALF XTAL SCL VIDEO MOD-ADJ TANK D-GND D-VCC SDA NC – 12 – 4 7 C17 27pF 8 C10 0.01µF C9 22pF R7 240 C12 47µF C15 22nF 4MHz-Xtal C20 0.1µF R5 180k L1 17µH 5 6 9 10 11 12 AUDIO GND VCC SCL SDA R14 200 1 2 3 +30V R3 100k R4 22k C2 0.33µF C4 22µF C3 22pF C8 330pF VIDEO CXA3050M Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. Application Circuit 2 Dual-OSC RF OUT L = 14nH C7 1nF 1T363 R6 10 1T363 L2 14nH C14 6pF C20 220pF R11 20k 15 14 13 16 C17 3pF C19 6pF C23 1nF C25 0.01µF Q1 C16 5pF L3 14nH R10 20k C6 22pF C9 22pF C13 220pF 19 18 17 21 20 R8 20k C22 1nF R12 300 C26 1nF C24 0.047µF R16 56k GND NICAM VCC Analog R9 20k C30 220pF GND GND VCC OSC C1 22pF R1 2.7k R2 75 C5 1nF P1 24 23 22 C29 20pF EF OSC4 OSC2 RFOUT A-GND VCO3 OSC1 NICAM-IN OSC-VCC ANALOG-V OSC-GND PDOUT R13 200 C27 1nF R15 2k C28 1nF VREG AUDIO ALF XTAL SCL VIDEO MOD-ADJ TANK D-GND D-VCC SDA NC – 13 – 4 7 C18 27pF 8 C11 0.01µF C10 22pF R7 240 C12 47µF C15 22nF 4MHz-Xtal C21 0.1µF R5 180k L1 17µH 5 6 9 10 AUDIO GND VCC SCL R14 200 1 2 3 11 12 +30V R3 100k R4 22k C2 0.33µF C4 22µF C3 22pF C8 330pF VIDEO SDA CXA3050M Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. Application Circuit 3 VHF-Band GND GND RF OUT R12 300 GND NICAM VCC Analog C7 1nF VCC OSC R10 20k C22 1nF C20 330pF C23 1nF R11 20k 21 20 16 19 18 17 15 14 13 C25 0.01µF Q1 C26 1nF C24 0.047µF C19 1nF R6 10 1T363 C6 22pF C14 120pF C16 47pF C18 120pF R9 510 L2 1µH R8 C11 20k 22pF C13 330pF C1 22pF R1 2.7k R2 75 C5 1nF 24 23 22 OSC4 OSC2 RFOUT A-GND VCO3 OSC1 PDOUT EF R16 56k NICAM-IN OSC-VCC OSC-GND ANALOG-V P1 R13 200 C27 1nF C29 20pF R15 2k VREG AUDIO ALF XTAL SCL VIDEO MOD-ADJ TANK D-GND D-VCC SDA NC – 14 – 4 7 C17 27pF 8 C10 0.01µF C9 22pF R7 240 L1 17µH 5 6 9 10 R5 180k C12 47µF C15 22nF 4MHz-Xtal C21 0.1µF AUDIO GND VCC SCL 1 2 3 11 12 C28 1nF R3 100k R4 22k C2 0.33µF C4 22µF R14 200 C3 22pF C8 330pF +30V VIDEO SDA CXA3050M Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. CXA3050M Example of Representative Characteristics 80 82 79 81 78 Video modulation [%] RF out [dBµV] 80 77 79 76 78 4 5 Vcc [V] 6 4 5 Vcc [V] 6 0.6 20 19 A : 4.5M A 18 17 B 16 15 14 B : 5.5M FM Sencitivity [kHz/mw] 6 0.5 P/S Ratio [dB] 0.4 0.3 4 5 Vcc [V] 4 5 Vcc [V] 6 3.3 95 3.2 Video modulation [%] 90 Video max. Video 0.55Vp-p Regulatar out [V] 3.1 85 3.0 80 2.9 75 4 5 Vcc [V] 6 600 700 800 900 RF Frequency [MHz] – 15 – CXA3050M 0.40 0.35 Without video Video 87.5% 69 68 Audio dist [%] 0.30 0.25 0.20 0.15 Audio S/N [dB] 67 66 65 64 4 5 Vcc [V] 6 4 5 Vcc [V] 6 3.0 2.5 0 –1 1.5 1.0 0.5 0 3.5 D.P [degree] 4 4.5 5 Vcc [V] 5.5 6 6.5 2.0 DG [%] –2 –3 4 5 Vcc [V] 6 1.0 0.5 1.0 0.5 Video out [dB] Audio out [dB] 0 –0.5 –1.0 –1.5 –2.0 0 5 10 15 20 25 Video f response [MHz] 0 –0.5 –1.0 –1.5 –2.0 0 100 Audio f response [kHz] 200 – 16 – CXA3050M 82 81 Video modulation [%] 80 79 78 77 76 –40 –20 0 20 40 60 80 100 Temperature [degree] 0 Over mod test = OFF Video 0.8Vp-p 20 Video modulation [%] 40 60 80 100 0 64µsec 0 Over mod test = ON Video 0.8Vp-p 20 Video modulation [%] 40 60 80 100 0 64µsec – 17 – CXA3050M Package Outline Unit: mm 24PIN SOP (PLASTIC) + 0.4 15.0 – 0.1 24 13 + 0.4 1.85 – 0.15 0.15 + 0.3 5.3 – 0.1 7.9 ± 0.4 + 0.2 0.1 – 0.05 0.45 ± 0.1 1.27 + 0.1 0.2 – 0.05 ± 0.12 M PACKAGE STRUCTURE MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SOP-24P-L01 ∗SOP024-P-0300-A LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY/PHENOL RESIN SOLDER PLATING COPPER ALLOY / 42ALLOY 0.3g – 18 – 0.5 ± 0.2 1 12 6.9