MC44BC375UADEVK

Document Number: MC44BC375U Rev 3, 8/2006 Freescale Semiconductor Data Sheet PLL Tuned VHF (Channel 3 / 4) Audio / Video Modulator MC44BC375U MC44BC375UA The MC44BC375U and MC44BC375UA are audio/video RF modulators for use in VCRs, set-top boxes, and similar devices. They are designed for applications requiring National Television System Committee, NTSC, channel 3 or channel 4, RF outputs. The difference between the two modulators is the RF output power level. The nominal RFOUT level for the MC44BC375U is 76 dBµV (typical) and the RFOUT level for the MC44BC375UA is 80 dBµV (typical). A programmable Phase-Locked Loop (PLL) tunes the modulator, and the desired channel 3 or 4 frequency isselected using the external package pin, Channel Selection (CHS). No external tank circuit components are required, reducing the sensitivity of the PCB design and the need for external adjustments. The PLL obtains its reference from a 4.0 MHz crystal oscillator. The modulators incorporate a sound subcarrier oscillator and use a second programmable PLL to derive subcarrier frequencies. The 4.5 MHz or 5.5 MHz sound carrier frequency is selectable via the package pin, Sound Frequency Selection (SFS). The Picture to Sound subcarrier ratio is also selectable by the pin, Picture to Sound Selection (PSS), to choose either a 14 dB or 16 dB ratio. A low-power standby mode is selectable via the pin, Psave/LO, which turns off all internal VCOs and mixers and simultaneously switches ON an output pin, Logic Output Port (LOP), which may be used as an antenna switch driver. PLL TUNED VHF (CHANNEL 3 / 4) AUDIO / VIDEO MODULATOR D or EF SUFFIX SOIC 16 PACKAGE CASE 751B-05 Features • • • • • • • • • • • Two RF output power levels offered: • MC44BC375U has typical RFOUT power of 76 dBµV • MC44BC375UA has typical RFOUT power of 80 dBµV U.S. broadcast frequency for Channel 3 or 4 operation is selected by CHS pin Programmable VHF oscillator and sound subcarrier oscillator. No external varicaps, diodes/inductors, or tuned components required. Programmable Picture/Sound Carrier Ratio (14 dB or 16 dB) is selected by PSS pin Programmable Sound Subcarrier Oscillator (4.5 or 5.5 MHz) is selected by SFS pin) Peak White Clip Low-power standby mode is selected by the Psave/LO pin Logic Output Port is selected by Psave/LO pin (Antenna Switch Driver) Transient output inhibit during PLL Lock-up at power-ON Available in Pb-free, RoHS compliant, narrow body SOIC 16 package Also available, for a limited time, in the standard Pb package with the D suffix MC44BC375U/UA Video In Mixer Clamp Clip ORDERING INFORMATION VCO Σ Crystal Audio In AM/FM Audio TVOUT Device Temp. Range RoHS MC44BC375UEF, R2 -20°C to +85°C Yes MC44BC375UAEF, R2 -20°C to +85°C Yes MC44BC375UD, R2 -20°C to +85°C No MC44BC375UAD, R2 -20°C to +85°C No Mixer Control Note: For tape and reel, add the R2 suffix. Channel 3/4 © Freescale Semiconductor, Inc., 2006. All rights reserved. PIN DESCRIPTIONS CHS 1 16 PSS 2 15 PLLFLT LOP XTAL 3 14 TVOVCC 4 13 TVOUT GND 5 12 GND PREEM 6 11 VCCA AUDIO 7 10 VIDEO SPLFLT 8 9 SFS PSave/LO SOIC16 pin package Figure 1. Pin Connections Table 1. Package Pin Descriptions Pin number Pin Name 1 CHS Channel select (Low = channel 4, High = channel 3) 2 PSS Picture-to-Sound ratio select (Low = 14 dB, High = 16 dB) 3 LOP Logical output port controlled by pin 9 4 XTAL Crystal / oscillator input 5 GND Ground 6 PREEMP Pre-emphasis capacitor 7 AUDIOIN Audio input 8 SPLFLT Sound PLL loop filter Description 9 PSAVE/LO 10 VIDEOIN Power save mode and LO control 11 VCC Main analog supply voltage 12 GND Analog ground Video input 13 RFOUT 14 RFOVCC RF output signal RFoutput stage supply voltage 15 PLLFLT RF PLL loop filter 16 SFS Sound frequency select (Low = 5.5 MHz, High = MHz 4.5 MHz) MC44BC375U 2 Application Specific Products Freescale Semiconductor FUNCTIONAL OVERVIEW Figure 2 shows a simplified block diagram of the MC44BS375U and MC33BS375UA devices. There are two main sections: 1. A PLL section to synthesize the VHF output channel frequency for channel 3 or channel 4. RFOVCC LOP Video Modulator 13 Sound Freq Select — SFS 16 SPLLFLT 10 8 MODULATOR SECTION Clamp Sound Oscillator and FM Modulator Sound PFD LPF Prog. Divider LPF 9 VIDEOIN 31.25 kHz 3 Power save Psave/ LOP A modulator section which accepts audio and video inputs and modulates the VHF carrier. The high frequency BiCMOS technology allows integration of the VHF tank circuit and certain filtering functions eliminating the need for a number of external components. Peak White Clip 14 75Ω RFOUT 2. LPF Audio Amplifier ALC Sound Modulator VHF Divider ÷8 7 AUDIOIN 6 PREEM 11 VCC 5 GND 2 Picture-Sound Select — PSS VCO & PLL SECTION UHF OSC. Prescaler ÷8 Channel Select — CHS Prog. Divider 1 12 GND Phase Comp. 31.25 kHz Ref Divider ÷128 15 PLLFLT 4 MHz XCO 4 XTAL Figure 2. MC44BS375U/UA Simplified Block Diagram POWER SUPPLY The two device VCCS (pins 11 and 14) must be applied at the same time to ensure all internal blocks are correctly biased. Do NOT bias any other pin before VCC is applied to the device. STANDBY MODES During standby mode, the modulator is switched to low power consumption. The sound oscillator, UHF oscillator and VHF dividers, video and sound modulator sections bias are internally turned OFF. The modulator is programmed in standby mode when pin 9, PSave/LO, is set to a “LO” level (see “Pin Selection” on page 4). LOGIC OUTPUT PORT The Logic Output Port is used to control an external switch (such as an antenna switch or an attenuator). This pin is an open collector transistor able to sink up to 15 mA at a low voltage. The LOP output is switched between a “HI” and “LO” level with pin 9, Psave/LO (see “Pin Selection” on page 4). MC44BC375U Application Specific Products Freescale Semiconductor 3 TRANSIENT OUTPUT INHIBIT To minimize the risk of interference to other channels while the UHF PLL is acquiring a lock on the desired frequency, the Sound and Video modulators are turned OFF at power-ON (i.e., VCC is switched from 0 V to 5.0 V or device is switched from “Standby mode” to “Normal operation”). There is a time-out of 263 ms until the output is enabled. This allows the UHF PLL to settle to its programmed frequency. During the 263 ms time-out, the sound PLL current source is set to 10 µA typical to speed up the locking time. After the 263 ms time-out, the current source is switched to 1.0 µA. Use care when selecting loop filter components to ensure the loop transient does not exceed this delay. VIDEO SECTION The modulator requires a composite video input with negative going sync pulses and a nominal level of 1.0 V(pp). This signal is AC coupled to the video input where the sync tip level is clamped. The video modulation depth typical value is given for 1.0 VCBVS input level. It can be adjusted to any lower value by simply adding a resistive divider at video input, resulting in a lower signal seen by the video input stage. The video signal is then passed to a peak white clip circuit whose function is to soft clip the top of the video waveform if the amplitude from the sync tip to peak white goes too high. In this way, over-modulation of the carrier by the video is avoided. The clipping function is always engaged. SOUND SECTION The multivibrator oscillator is fully integrated and does not require any external components. An internal low pass filter and matched structure give a very low harmonics level. The sound modulator system consists of an FM modulator incorporating the sound subcarrier oscillator. The audio input signal is AC coupled into the amplifier which then drives the modulator. The audio pre-emphasis circuit is a high-pass filter with an external capacitor C1 and an internal resistor (100 kΩ typical). The recommended capacitor value (750 pF) is for M/N standards, time constant is 75 µs and it is 470 pF for B/G standards (50 µs). The audio bandwidth specification is for 50 Hz to 15 KHz range, with pre-emphasis circuit engaged. Without this preemphasis circuit, it is possible to extend the audio bandwidth to high frequencies, as there is no internal frequency limitation (stereo application). PLL SECTION — DIVIDERS The reference divider is a fixed ÷128 resulting in a reference frequency of 31.25 KHz with a 4.0 MHz crystal. The 31.25 KHz reference frequency is used for both the UHF and Sound PLLs. The prescaler is a fixed ÷8 and is permanently engaged. The VHF divider is also a fixed ÷8. The programmable divider’s division ratio is controlled by the CHS pin voltage in order to select channel 3 or channel 4. PIN SELECTION Pins CHS, PSS, and SFS are internally pulled up to 5.0 V. By default (open condition), all pins are “HI”. Table 2. Configuration Pin Settings Pin No Pin Name LO (grounded) HI (open or +5.0 V) 1 CHS CH4 CH3 2 PSS 14 dB 16 dB 9 PSave/ LOP Power save Mode LOP pin LO (Low voltage) Normal Operation LOP pin HI (High impedance) 16 SFS 5.5 MHz 4.5 MHz MC44BC375U 4 Application Specific Products Freescale Semiconductor ELECTRICAL SPECIFICATIONS Table 3. Absolute Maximum Ratings Absolute maximum continuous ratings are those maximum values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation at absolutemaximum-rated conditions is not implied. Characteristic Symbol Min Max Units Supply Voltage VCC -0.3 +6.0 V Any Input Voltage Vin -0.3 VCC + 0.3 V Storage Temperature Range Tstg -65 +150 °C TJ — +150 °C Junction Temperature Table 4. General Specifications Characteristic Symbol Min Typ max Units ESD Protection (Machine Model) MM 200 500 — V ESD Protection (Human Body Model)(1) HBM 4000 6000 — V Thermal resistance from Junction to Ambient RΘJA — 140 — °C/W 1. MIL STD 883C method 3015-7. Table 5. Recommended Operating Conditions and DC Characteristics Characteristic Supply Voltage Symbol Min Typ Max Units VCC +4.5 +5.0 +5.5 V Total supply current (all sections active) MC44BC375U MC44BC375UA ICC ICC 40 40 47 50 55 57 mA mA Total standby mode supply current MC44BC375U MC44BC375UA ICC ICC 3.0 3.0 5.0 6.0 7.0 8.0 mA mA 7.0 0.7 10 1.0 12 1.5 µA µA RF comparator charge pump current 60 100 150 µA Crystal oscillator stability-negative resistance 1.0 — —- KΩ Vth — 2.1 —- V VOL Ileackage — — 210 — 300 1.0 mV µA TA -20 — +85 °C Sound comparator charge pump current: During locking When locked Threshold level on pins: CHS, PSS, SFS, Psave/LO Logic Output Port: Saturation voltage at I OL = 15 mA Leakage current Ambient Temperature MC44BC375U Application Specific Products Freescale Semiconductor 5 PERFORMANCE CHARACTERISTICS Unless otherwise stated, all performance characteristics are for: • Power Supply, VCC = 5.0 V • Ambient Temperature, TA = 25o C • Video Input 1.0 Vp-p, 10-step grayscale. • RF inputs/outputs into 75 Ω load. NOTE: Specifications only valid for envelope demodulation. The parameters listed are based on the type of test conditions found in the column Type. • A = 100% tested • B = 100% Correlation tested • C = Characterized on samples • D = Design parameter See the “Characterization Measurement Conditions” on page 8 for each C type parameter. Table 6. High Frequency Characteristics Test Conditions(1) Device Min Typ Max Unit Type RFOUT output level Output signal from modulator section MC44BC375U MC44BC375UA 74 78 76 80 79 83 dBµV B Sound subcarrier harmonics (Fp+n∗Fs) Reference picture carrier MC44BC375U MC44BC375UA — — .73 -72 -65 .65 dBc C Second harmonic of chroma subcarrier Using red EBU bar MC44BC375U MC44BC375UA — — -65 — -55 -60 dBc C Chroma/Sound intermodulation: Fp+ (Fsnd - Fchr) Using red EBU bar MC44BC375U MC44BC375UA — — -65 — -60 -60 dBc C Fo (picture carrier) harmonics(2) 2nd harmonic MC44BC375U MC44BC375UA — — 30 — 42 46 dBµV C 3rd harmonic: MC44BC375U MC44BC375UA — — 66 — 69 73 dBµV C Out band (picture carrier) spurious 1/2∗Fo - 1/4∗Fo 3/2∗Fo - 3/4∗Fo MC44BC375U MC44BC375UA — — — — 27 32 dBµV C In band spurious (Fo @ 5.0 MHz) No video sound modulation MC44BC375U MC44BC375UA — — -70 — -62 -60 dBc C 4.0 MHz Crystal spurious (Fo ± 4.0 MHz) No video sound modulation MC44BC375U MC44BC375UA — — -82 — -75 -75 dBc C Parameter 1. See Performance Measurement Test Set-ups, Table 9. 2. Picture carrier harmonics are highly dependant on PCB layout and decoupling capacitors. Table 7. Video Performance Characteristics Test Conditions(1) Min Typ Max Unit Type Video bandwidth Reference 0 dB at 100 KHz, measured at 5.0 MHz -1.5 -0.5 — dB C Video input level 75 Ω load — — 1.5 Vcvbs D Video input current — 0.2 1.0 µA A Video input impedance — 500 — KΩ A Weighted 56 60 — dB C Unweighted 49 52 — — C Differential Phase On line 17 in M standard (FCC) — ±1.0 — deg C Differential Gain On line 17 in M standard (FCC) — 1.0 5.0 % C Luma/Sync ratio Input ratio 7.0:3.0 6.8/3.2 — 7.2/2.8 — B Video modulation depth Video input level = 1.0 VCVBS 80 85 90 % B Peak White Clip Video Modulation depth for video = 1.4 VCVBS 90.5 95 99.5 % B Parameter Video S/N 1. See Performance Measurement Test Set-ups, Table 9. MC44BC375U 6 Application Specific Products Freescale Semiconductor Table 8. Audio Performance Characteristics Test Conditions(1) Parameter Min Typ Max Unit Type Picture-to-Sound ratio PSS pin = High PSS pin = Low 14 12 16 14 18 14 dB B Picture to Sound ratio difference between PSS = HI and PSS = LO 1.5 2.0 2.5 dB B Audio modulation depth Using specific pre-emphasis circuit, Audio input = 1.0 KHz @ 205 mVrms Fs = 4.5 MHz (100% modulation = ±25 KHz FM deviation) 75 85 95 % B Fs = 5.5 MHz (100% modulation = ±50 KHz FM deviation) 75 85 95 % B 45 55 61 KΩ A -2.5 — +2.0 dB C — 0.3 1.0 % C 50 53 — dB C Audio input resistance Audio Frequency response Reference 0 dB at 1.0 KHz, Measure from 50 Hz to 15 KHz Depends on loop filter components Audio Distortion FM (THD only) At 1.0 KHz, 100% modulation (±50 KHz) No video Audio S/N with Sync Buzz FM 1. See Performance Measurement Test Set-ups, Table 9. MC44BC375U Application Specific Products Freescale Semiconductor 7 CHARACTERIZATION MEASUREMENT CONDITIONS • • • Device default configuration unless otherwise specified: Sound subcarrier frequency = 5.5 MHz Picture-to-sound carrier ratio = 14 dB CH3 and CH4 frequencies • • • RF Inputs / Output into 75 Ω Load using a 75 to 50 Ω transformation Video Input 1.0 V pk-pk Audio pre-emphasis circuit engaged Table 9. Performance Measurement Test Set-Ups Device and Signals Set-Up Measurement Set-Up RFOUT Output Level Video: 10 steps grey scale No audio Measured picture carrier in dBµV with the HP8596E Spectrum Analyzer using a 75 to 50 Ω transformation, all cables losses and transformation pads having been calibrated. Measurement is used as a reference for other tests: RFout_Ref Sound Subcarrier Harmonics Video: 10 steps grey scale No audio signal Measure in dBc second and third sound harmonics levels in reference to picture carrier (RFout_Ref). Picture carrier Sound carrier Sound 2nd harm Sound 3rd harm Fo +5.5 MHz +11 MHz +16.5 MHz Second Harmonics of Chroma Subcarrier No audio Video: a 700 mV(pp) 100 kHz sinusoidal signal is inserted on the black level of active video area. Measure in dBc, in reference to picture carrier (RFout_Ref), second harmonic of chroma at channel frequency plus 2 times chroma frequency, resulting in the following spectrum. Picture carrier Frequency Frequency 100kHz 100 kHz Chroma carrier 700 mVpkpk Sound carrier 700mV pk-pk Chroma 2nd Harmonic Fo +4.43 MHz +5.5 MHz +8.86 MHz MC44BC375U 8 Application Specific Products Freescale Semiconductor Table 9. Performance Measurement Test Set-Ups (continued) Device and Signals Set-Up Measurement Set-Up Chroma/Sound Intermodulation No audio signal Video: 700 mV(pp) 100 kHz sinusoidal signal inserted on the black level of active video area.This is generated using a Video Generator and inserting the required frequency from a RF Signal generator. Frequency Frequency 100kHz 4.43 MHz Measure in dBc, in reference to picture carrier (RFout_Ref), intermodulation product at channel frequency plus the sound carrier frequency (+5.5 MHz) minus the chroma frequency (-4.43 MHz), resulting in the following spectrum. Intermodulation product is at the channel frequency +1.07 MHz. Picture carrier Sound carrier Chroma carrier 700 mVpkpk Chroma/Sound Intermod. 700mV pk-pk Fo +1.07 MHz +4.43 MHz +5.5 MHz Picture Carrier Harmonics No video signal No audio signal Measure in dBc, in reference to picture carrier (RFout_Ref), second and third harmonic of channel frequency, resulting in the following spectrum. Picture carrier 3rd harmonic 2nd harmonic Fo 2Fo 3Fo Out of Band Spurious No video signal No audio signal Measure in dBµV spurious levels at 0.25, 0.5, 0.75 and 1.5 times channel frequency, resulting in the following spectrum. Measure from 40 MHz to 1.0 GHz. Picture carrier Spurious Fo/4 Fo/2 Fo*3/4 Fo Fo*3/2 In Band Spurious / 4 MHz Crystal Spurious No video signal No audio signal Measure in dBc, in reference to picture carrier (RFout_Ref), spurious levels falling into video bandwidth Fo+/-5.0 MHz (15.125 KHz & 31.25 KHz from reference dividers and 4 MHz from crystal). Video Bandwidth No audio The Video signal is demodulated on the spectrum analyzer, and the peak level Video: 600 mV(pp) sinusoidal signal inserted of the 100 KHz signal is measured as a reference. The frequency is then swept from 100 KHz to 5.0 MHz, and then the difference in dBc from the 100 KHz on the black level of active video area. reference level is measured. MC44BC375U Application Specific Products Freescale Semiconductor 9 Table 9. Performance Measurement Test Set-Ups (continued) Device and Signals Set-Up Measurement Set-Up Weighted Video Signal to Noise Video: 100% White video signal — 1 Vpk-pk. No audio signal This is measured using a Demodulator in B/G using a CCIR Rec. 567 weighting network, 100 KHz to 5.0 MHz band with sound trap and envelope detection, and a Video Analyzer. The Video Analyzer measures the ratio between the amplitude of the active area of the video signal (700 mV) and the noise level in Vrms on a video black level which is shown below. VideoS/N is calculated as 20 x log(700 /N) in dB. N noise level in Vrms Unweighted Video Signal to Noise Same as above with CCIR filter disabled. Same as above. Video Differential Phase Video: 5 step Grey Scale — 1 V(pp). No audio signal This is measured using a Demodulator in B/G using a CCIR Rec. 567 weighting network, 100 KHz to 5.0 MHz band with sound trap, and envelope detection, and a Video Analyzer. On line CCIR 330, the video analyzer DP measure consists of calculating the difference of the Chroma phase at the black level and the different chroma subcarrier phase angles at each step of the greyscale. The largest positive or negative difference indicates the distortion. the largest positive or negative difference DIFF PHASE = the phase at position 0 * 100% The video analyzer method takes the worst step from the first 4 steps. Video Differential Gain Video: 5 step Grey Scale — 1 V(pp). No audio signal This is measured using a Demodulator in B/G using a CCIR Rec. 567 weighting network, 100 KHz to 5.0 MHz band with sound trap and envelope detection, and a Video Analyzer. On line CCIR 330 shown below, the video analyzer DG measure consists of calculating the difference of the Chroma amplitude at the black level and the different amplitudes at each step of the greyscale. The largest positive or negative difference indicates the distortion. 0 1 2 3 4 5 5-step Greyscale with Chroma subcarrier superimposed (not to scale), line CCIR 330. DIFF GAIN = the largest positive or negative difference the amplitude at position 0 * 100% The video analyzer method takes the worst step from the first 4 steps. CCIR line 330 corresponds to FCC line 17 in NTSC/M standard. MC44BC375U 10 Application Specific Products Freescale Semiconductor Table 9. Performance Measurement Test Set-Ups (continued) Device and Signals Set-Up Measurement Set-Up Video Modulation Depth No audio signal Video: 10 step grey scale This is measured using a HP8596E Spectrum Analyzer with a TV Trigger option, allowing demodulation and triggering on any specified TV Line. The analyzer is centered on the maximum peak of the Video signal and reduced to zero Hertz span in Linear mode to demodulate the Video carrier. A ( 6-10mV) A(mV) B(mV) B (0.6 - 3mV) TV Line Demodulated by Spectrum Analyzer-BG standard The Modulation Depth is calculated as (A-B)/A x 100 in%. Picture to Sound Ratio No video signal No audio Signal “PSS” pin set Low and High Measure in dBc sound carrier in reference to picture carrier (RFout_Ref) for “PSS” = Low (PS = 14 dB typical) and for “PSS” = High (PS = 16 dB), Picture carrier Sound carrier Fo +5.5 MHz Audio Modulation Depth — FM Modulation Video Black Level The audio signal 205 mV at 1.0 KHz is supplied by the Audio Analyzer, and the FM demodulated signal deviation is indicated on the Demodulator in KHz peak. Audio signal: 1.0 KHz, 205 mVrms. This is measured using a Demodulator in B/G This value is then converted in% of FM deviation, based on specified standards. and an Audio Analyzer at 1.0 KHz. Audio Frequency Response Video Black Level Audio signal: 50 Hz to 15 KHz, 100 mVrms This is measured using a Demodulator in B/G and an Audio Analyzer. The audio signal 1.0 KHz 100 mVrms is supplied by the Audio Analyzer, demodulated by the Demodulator and the audio analyzer measures the AC amplitude of this demodulated audio signal: this value is taken as a reference (0 dB). The audio signal is then swept from 50 Hz to 15 KHz, and demodulated AC amplitude is measured in dB relative to the 1.0 KHz reference. Audio pre-emphasis and de-emphasis circuits are engaged, all audio analyzer filters are switched OFF. Audio Distortion FM Audio: 1.0 KHz, adjustable level Video Black Level This is measured using a Demodulator in B/G and an Audio Analyzer at 1.0 KHz. The output level of the Audio analyzer is varied to obtain a deviation of 50 KHz indicated on the Demodulator. The input rms detector of the Audio Analyzer converts the ac level of the combined signal + noise + distortion to dc. It then removes the fundamental signal (1.0 KHz) after having measured the frequency. The output rms detector converts the residual noise + distortion to dc. The dc voltmeter measures both dc signals and calculates the ratio in% of the two signals. ADist = ( Distorsion + Noise ) ⁄ ( Distorsion + Noise + Signal ) MC44BC375U Application Specific Products Freescale Semiconductor 11 Table 9. Performance Measurement Test Set-Ups (continued) Device and Signals Set-Up Measurement Set-Up Audio Signal to Noise Audio: 1.0 KHz, adjustable level Video: EBU Color Bars This is measured using a Demodulator in B/G and an Audio Analyzer at 1.0 KHz. The output level of the Audio analyzer is varied to obtain a Modulation Deviation of 25 KHz indicated on the AMFS Demodulator. The Audio Analyzer alternately turns ON and OFF its internal audio source to make a measure of the Audio signal plus noise and then another measure of only the noise. The measurement is made using the internal CCIR468-2 Filter of the Audio Analyzer together with the internal 30+/-2.0 KHz (60 dB/decade) Lowpass filters. The AMFS demodulator uses a quasi-parallel demodulation as is the case in a normal TV set. In this mode the Nyquist filter is bypassed and the video carrier is used without added delay to effectuate intercarrier conversion. In this mode the phase noise information fully cancels out and the true S/N can be measured. ASN ( dB ) = 20 × log ( Signal + Noise ) ⁄ ( Noise ) PIN CIRCUIT SCHEMATICS VCC VCC VCC Pin 1: CHS Pin 2: PSS Pin 16: SFS Pin 9: Psave/LO 100K 5K Pin 8: SPLLFLT VCC VCC Pin 3: LOP Pin 10: VIDEOIN 500 10K VCC 10K VCC 5K Pin 4: XTAL Pin 13: RF OUT 1.5K VCC VCC 75 Pin 14: RFOVCC Pin 6: PREM 10k 11.8k audio VCC VCC VCC 50k 100 Pin 15: PLLFLT 2K Pin 7: AUDIOIN Figure 3. Pin Schematics MC44BC375U 12 Application Specific Products Freescale Semiconductor Application Specific Products Freescale Semiconductor A B C D MT4 MT3 J9 1 3 5 7 9 HEADER 5X2 2 4 6 8 10 J4 Video Input BNC Connector J3 Audio Input BNC Connector Automated Test Equipment Interface +5V R3 75 R4 Note 5 10K C5 100nF 8 7 6 5 4 R1 15K C9 10nF Note 7 C7 22nF 10% R5 10K +5V C4 750pF 5-10% Note 1 C1 27pF 10% R7 10K DNI for Mono Note 7 for Stereo C8 2.2uF C6 220nF 10% Notes 4,6 Y1 4.000Mz Logic Output Port 1 2 3 4 ECS Inc. ECS-40-20-1 TP1 Switch SW1 +5V 3 +5V 8 7 6 5 4 3 2 1 R8 10K R9 10K 5 4 3 VIDEO VCCA GND TVOUT TVOVCC PLLFLT SFS Date: Size A J6 SPLFLT PSAVE_LO AUDIO PREEM GND XTAL LOP PSS CHS U1 MC44BC375UA-16 +5V NOTES 1. C1 value depends on the parallel mode crystal characteristics C1 = 27pF on the Freescale evaluation board with an ECS Inc. ECS-40-20-1 crystal. 2. RF PLL loop filter components (C12, C13, R2) at pin 15 must be as close as possible to TVOVCC at pin 14. 3. Supply voltage decoupling capacitors (C17, C102, C20) must be as close as possible to the device power pins (P14, P11). 4. C4 pre-emphasis cap value depends on video standard. PAL B,G has a 50µS time constant, C4 = 470pF. PAL, NTSC M/N has a 75 µS time constant, C4 = 750 pF. STEREO APPLICATIONS: 5. The value of the audio input capacitor, C5, can be increased to 220nF to improve low frequency response. 6. The audio signal is encoded and pre-emphasis is applied in the baseband stereo encoder. It is not necessary to add pre-emphasis in the RF modulator and the pre-emphasis capacitor C4 should be removed. Sometimes it is useful to increase the FM deviation. Replace the original pre-emphasis capacitor, C4, with a 100-nF capacitor. Adding this kind of value boosts the deviation and does not create a pre-emphasis. 7. Sound loop filter C6 and C7 are in a 10:1 ratio, and should be changed to 1uF and 100nF respectively for stereo applications. R1 should also be changed to 5.6K. It is possible to peak the low audio frequencies (from 30 to 80 Hz) by adjusting the resistor, R1. A value of 4.7 K gives a peak of about 1 dB at 40 Hz and extends the low-frequency cut-off to 28 Hz. Another option for absolutly the BEST stereo performance at the cost of slow startup (1-2 seconds) is to use C8 = 2.2uF. MTHOLE MTHOLE MTHOLE MTHOLE MT2 MT1 5 J8 J7 1 +5V Note 3 J1 C22 10nF Note 3 2 1 R6 100K 2 1 C23 100nF C11 10nF R2 2.2K Note 7 Note 7 Note 6 Stereo Note 7 22nF Note 7 DNI C8 +5V C24 10uF Size 3216 RF Output F Connector J5 +5V Note 2 2 Monday, December 06, 2004 Sheet 1 1 of 1 Applications Specific Products Organization Chandler, Arizona Title Rev MC44BC375 16Pin Frequency Agile Modulator Evaluation Board 0.2 220nF 15K ohm Note 4 Mono C7 +5V Power Connector .1 inch header +5V C21 10nF C12 47nF 10% C13 22nF 10% All Resistors are 0603 size, 5% unless otherwise noted. All Capicitors are 0603 size, XR7/XR5 type unless noted, (10% type are COG/NPO) Component Changes for Stereo Mode C4 R1 C6 9 10 11 12 13 14 15 16 2 A B C D APPLICATION SCHEMATIC Figure 4. MC44BC375U/UA Application Schematic MC44BC375U 13 PACKAGE DIMENSIONS Figure 5. SOIC16 Package Dimensions MC44BC375U 14 Application Specific Products Freescale Semiconductor Figure 6. SOIC16 Package Dimensions - part 2 MC44BC375U Application Specific Products Freescale Semiconductor 15 How to Reach Us: Home Page: www.freescale.com E-mail: support@freescale.com USA/Europe or Locations Not Listed: Freescale Semiconductor Technical Information Center, CH370 1300 N. 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