M51348FP

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MITSUBISHI ICs (TV) . POCKET TV IF SYSTEM DESCRIPTION PIN CONFIGURATION (TOP VIEW) The M51348 is a low supply voltage, low power semiconductor IC for compact TV sets which includes Video Intermediate Ly " IF AGC control Frequency (VIFI, Sound Intermediate Frequency (SIF), and IF AGC filter { fe Be Ace oat Synchronous Separation (Sync. Sep.) functions. RF AGC output E] = {2 Syretronaus separation input An IF amplifier, video detector (with simultaneous sound RF AGC control &] 2 [2] AFT coil detector), IF AGC, RF AGC (forward type), AFT, SIF limiter MIF - Voc a g Ee | video detector coil amplifier, FM detector, electronic volume, and synchronous IF input { 2B Fil Video output separation function are provided. Vir GND fg 3 AFT output - A Y SIF - Vec B 6] Limiter output The package is of the 24-pin mini-flat type. SIF input [2] Fa] FM astscter input T The M51348AFP has better DG and DP but less VIF input DC - feedback [1] [14] Electronic volume sensitivity than the M51348FP. SIF - GND [2] [13] Audio output line 24P2-C FEATURES Outlin @ This IC can be used with very low supply voltage and low power and it comes in a miniflat package to suit . the compact TV or compact TV tuner. @ The AGC works fast because of the 2-stage AGC filter. Consuming current AGC noise canceller, dessssesneeee TEMA(WhHEN used with 4.5V supply voltage) @ Emitter input circuit is used in Sync. Sep. Output is taken Current automatically decreases to ensure power saving from the Sync. positive polarity. when a strong signal is received, when the AFT is not in use, i.e., when mute switch is ON, and when the APPLICATION electronic volume control is at its lowest. Portable B/W, color TV @ There are separate GND pins for the VIF/Sync. Sep. circuit and for the SIF circuit so that cross-interference is reduced. | RECOMMENDED OPERATING CONDITIONS @ It is possible to adjust the video detector output amplitude Supply voltage range ....vcsscsssssseneesensseeesseen 3,0~6,0V BLOCK DIAGRAM vito SMpernion'™ Siparatoe” arr Spree video AFT Limiter GeteetorEtctronie srexten maxtor a rn wie, Se Ste Sas trol ti con Sepwrton PL EM detector (VR) (5 Ave, —_ | IE AGC I} amt ig age amplifier IF ace ie t | filter RF AGC RF AGC VIF- > VIF- SIF- ‘SIF DC-feedback output control Veco IF input GND vec input er MITSUBISHI a iees 2-127 a

MITSUBISHI ICs (TV) POCKET TV IF SYSTEM ABSOLUTE MAXIMUM RATINGS Ratings Veco (5) Supply Voltage (1) 75 Vee (9) Supply Voltage (2) 75 | Ps | Power Dissipation 500 = 20~75 = 40~125 ELECTRICAL CHARACTERISTICS (Ta = 25°C, unless otherwise noted) VIF SECTION fem [vse acest omr mance [orf on | || h on SG1 | Input tevel when output amplituce 45 50 ir SG1_| input level when output amplitude} 90 | 109 Vin mex | Maximum allowable input ® | varsote| reaches 3 aB more than Vo cet | (95) (114) BW is defined as f1-f2 when BW Video frequency characteristic @ | SG2 | output amplitude reaches-3 dB 7 MHz less than that when f1-f2= IMHz. , SG4 | Output DC voltage with 4.5V fa [ream wm | Pete] er rs nm is asa geme mm) | 0) we || fs [army | Dom SG5 | Output DC voltage with OV in Vui7 | DC voltage at AFT mute ON | @ |e, ® 225| 25] v fe farce fe] [SRO os al as] | Video detector output at high or low] Output amplitude with 6.0V | 0.95 | 1.25 | 1.55 | Vp-p voltage 20dBu} or _3.0V in © [03s [os [oss | 1" Note: () indicates vaiue for the MS1348AFP. MITSUBISHI 2 - 128 oes

MITSUBISHI ICs (TV) ° POCKET TV IF SYSTEM ee)

ELECTRICAL CHARACTERISTICS

SIF SECTION _ [Min Tyo. [Wax [ist | Cireuit current | © |_| Input current with 45V in © fim [rowinws nen foie imaramnmer=| | a) las] Red 8 ee where Vane AMR | AM rejection ratio jenotes output amplitude. I90dB | _ ‘Vo ar (mVrms)’ LI AMR = 20 los (eS mms} ) j Scs fire [em mc Electronie volume control ‘SGB | Ratio of cutout amoltude and Ve ar| 3.3 | 3.75 | 4.2 | cB | characteristic [90GB | when @ is changed from 40v to tv. | — 63 | - 52] dB_| fre [ome Lf nr enn] 8 a | Detector output voltage at high or ‘SG6 | Output amplitude with 6.OV | 380 | 430 | 480 |mVrms| low voltage J90dBu} or 3.0V_ in © [53 [64 | 75 [mvims] Note: © indicates measuring circuit. PRECAUTIONS CONCERNING ELECTRICAL CHARACTERISTICS SG7_ fo=4.5MHz AM30% fm=400Hz 1.Voltage supplied (pins © and @) is 4.5V unless otherwise SG8_ fo=4.S5MHz+200kHz FM7.5kHz dev noted in the conditions column. fm=400Hz 2.VIF input amplitude (Vin) is the amplitude of VIF IN in SG9 fo=4.5MHz FM7.5kHz dev — fm=400Hz the circuit below. Feed SG1 90dBu signal into the circuit below, and measure the DC voltage V2 at @. Set the 4. Adjustment of LLD coil circuit for AC voltage measurement and adjust the input —‘1)Feed SG5 Vi=90dBy into VIF IN. amplitude, monitoring DC voltage at @, until it reaches 2)AFT coil must be shifted to detuned condition. the level of V2. 90dBy is defined as the input amplitude at that time. 3)Feed outside voltage to @ and check tank response at ® as shown in the figure below. ©O—O)—® 4)Adjust LLD coil so that peak comes at 58.75MHz. 0.01 uw VIF nO i 0.01 u Soe ih 58.75MHz Vis O.6VP-P OC level with no signal 3.input signals are shown below. SG1 fo=58.75MHz fm=20kHz 77.8%AM SG2_f1=68.75MHz Vi=90dBH CW) dg oi —— f2=53+5MHz Vi=70dB CW } 9 SG3_fo=58.75MHz LINEARITY 10step signal (87.5%Video modulation) SG4 fo=58.75MHz cw SG5 fo=58.75:5MHz CW (Sweep) SG6 fo=4.5MHz FM25kHz dev fm=400Hz

4 MITSUBISHI

MITSUBISHI ICs (TV) POCKET TV IF SYSTEM ——s 5.Adjustment of AFT coil BW\\s): Bandwidth “BWis)” 1)Feed SG5 Vi=90dBy in VIF IN. First, define Vooen FM as the output amplitude when 2)Measure the voltage at pin ® and adjust AFT coil as the signal fo=4.5MHz, fm=400Hz and faev=%7.5kHzis given shown in the figure below. to SIF IN. 58.75MHz Second, decrease and increase the frequency fo until the output amplitude reaches -3dB than VooenFM. These are defined as foi, and fox, respectively. Bandwidth is 225v defined as BW(s)=for-for. Viz M:AFT detector sensitivity “1” . AS ~--4\\--- 2.25V wiz ac SV. f 58.75MHz ___1500mV HS FelkHe—falkHa), . where fa denotes a frequency at A and Fa at B. TEST CIRCUIT 80 390k 0.01 un 0.07]u @) ie 0.0.1 2 (0 fe) 820p/470 ) id @) oD 4.7K 1202 24 _[e3]_fee]_ fer] feo) fis] fis] fir] fre] fis] fig] fig] Tee eee oe ee @ © lo.01 my # rae a Ex $34I500) VIF IN SIF IN Units Resistance: Q Capacitance: F TS oases 2 - 130 ELECTRIC

MITSUBISHI ICs (TV) M51348FP/AFP . POCKET TV IF SYSTEM POET TY SYST TYPICAL CHARACTERISTICS THERMAL DERATING (MAXIMUM RATING) IF AGC CHARACTERISTICS (M51348FP) 08 5.0 [TT yt ty isa rp nl | ae s ZAP eC Zoot] | i g iP REAL Fo | IN, | 5 aot TTT AL § oo NE SC oe a eee Sof + | | tf * EEE ao. | | | IJ @LLErrrrt -20 0 25 50 75 100 125 030 40 50 60 70 80 90 100110 AMBIENT TEMPERATURE Ta (©) INPUT (dB y) AGC CHARACTERISTICS (M51348FP) AFT BROADBAND CHARACTERISTICS 2.0 7 ~h s (44a espe] 8 SEER 2s —t i, & ‘Oye roo 5,11 1 TTT ee ae ee a eee § ol LEE 5 of g ost_4 oe s Uy T TTT TT BO CCeccecee wit ttt tl -3LL1 CET T] 30 40 50 60 70 80 90 100110 -5-4-3-2-10 be 345 (88.75MH:; INPUT (dB 0) FREQUENCY DEVIATION (MHz) SOUND DETECTOR OUTPUT DETUNING AGC CHARACTERISTICS (M51348AFP) CHARACTERISTICS 400 2 . 8 ? i a Se er T 15 g 33 SSC ee 7 ieeeens 8 ese ke

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MITSUBISHI ICs (TV) M51348FP/AFP POCKET TV IF SYSTEM POCKET TV IF SYSTEM IF AGC CHARACTERISTICS (M51348AFP) 5.0, eranaes

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) 50 100 150 AUDIO INPUT (dB ) SOUND OUTPUT ELECTRONIC VOLUME CONTROL CHARACTERISTICS 400 77> G5Mne EEL £ 300 WWia,= 8068 eat 7 | I 2 200 7 et Ald fe} is} 100 “LZ | % 1 2 3 3.6 CONTROL VOLTAGE (V) eee 2 - 192 oe tee ‘

MITSUBISHI ICs (TV) POCKET TV IF SYSTEM sees APPLICATION EXAMPLE Video — chroma, 120 circuit 50 4.5MHz trap 5602 Ee on Se “ia O01 fscriminetor 100 aT at 3905 loon Ht 50k Audio $47 ex ry 24302 output 20k rg 08 390k iP ra70.8 nr wh gra cere [ea] __ [23] i] _f2o]_frg]_ fra] fie]___fi5] [13] Qe a3 “o4 3 Video detector coil 3 3 B3 83 2e 2g ge gf gB OB EB g gf G2 35 8 uf e é & 3 ka 33 3 3s 3 é go & 8 2 Ey 5 F 9 2 € uw ‘ o IF_AGC filter es &8 5 IF input 5 id fa 8 a TT 7 eee ale Baw] 001 [eC 4 oe Tok , " as 50k S a 22um & 45MHez filter Sk RF AGC output 1

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MITSUBISHI ICs (TV) M51348FP/AFP - POCKET TV IF SYSTEM ee _ DESCRIPTION OF PIN Audio output [13} {12} 40k 50k - Electronk 14] 1 Zit volume 40k T a bs} oi SIF input == ios 5k Tk fa os E T 36k 8 H as output ria Bias vieo TBST ie 4 - a = BEL ow

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oot! GL yet 24 4] pale Bias RF AGC “lh 25k control 7 . 7 Die] = i Syne. Sep. RF AGC output Com I ae ‘output 27k 10k al IF AGC 19% m1 a control Units Resistance: Q Capacitance: F Pe 2 - 134 ELECTRIC eae

MITSUBISHI ICs (TV) M51348FP/AFP POCKET TV IF SYSTEM PRECAUTIONS FOR APPLICATION 1. Operating supply voltage This IC can be used with 3~6V. Within this range, the higher the supply voltage is, the greater the current dissipation is and the higher the performance is. However, VIF input sensitivity reaches @ high level with high Vcc, so care must be taken with amplifier oscillation. Separate power supplies may be used for VIF and SIF.. 2.AFT operation The AFT coil pin should be grounded (Pin @) if AFT circuit is not in use. This reduces current dissipation of the AFT block. 3.1F AGC control (Pin @) This pin has 0.9Vee voltage with no connection. The lower the outside voltage to Pin @ is, the higher the detector . output becomes. 4.FM detector circuit (Pin ©, ©) The following circuit is recommended if a coil is used. © 8 339 ® 5.Electronic volume control (Pin @) This pin has Vcc/2 voltage inside. Detector output and circuit current change from max. to min. corresponding to outside voltage change from Vcc to OV. Input Vec or leave Pin @ open when electronic volume control is not in use. 6.DG/DP The M51348FP and AFP, and 10k coil and 5k coil types have standard differences as follows: LLD, AFT Coil Example 5k 4turn 47pF Q=75 Pe Mee ELECTRIC 2 - 135 a