AN7280S

AN7280S PANASONIC | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 7

Technical content

The AN7280S is an FM front-end IC designed for DTS except RF amp. of car radio. It features built-in local oscil- lation frequency buffer output, PIN diode driver for anten- na damping and SSC (search stop control). n Features

• High sensitivity, high S/N ratio
• Good IM characteristics at strong input
• Available for two loop AGC (keyed AGC)
• Pre IF amp. gain variable
• PIN diode driver (ADX) built-in AN7280S FM Front-end IC for Car Radio Unit : mm 0.1–0.1 1.5–0.2 0.3 0.65 0.15 0.4 1 0.4–0.251.27 12.6–0.3 5.4–0.3 7.7–0.3 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 ADX Mixer Buffer Buffer OSC Det. AGC Amp. IF Amp. V REG SSC GND GND V CC n Block Diagram 20-Lead SOP Package (SOP020-P-0300B)

AN7280S ICs for FM/AM T uner V C C IC C PD Topr Tstg Supply V oltage Supply C urrent Pow er D issipation O perating A m bient Tem perature Storage Tem perature V m A m W Param eter Sym bol R ating U nit n Absolute M axim um R atings (Ta=25˚C ) 9.2 460 –40 ~ + 85 –55 ~ + 150 n R ecom m ended O perating R ange (Ta=25˚C ) Param eter Sym bol R ange O perating Supply V oltage R ange V C C 6.8V ~ 9.2V Param eter Sym bol C ondition m in. typ. m ax. U nit n Electrical C haracteristics (Ta=25˚C ) S/N R atio Local O scillation Level IF O utput Level A G C Level (L) A G C Level (H ) N O U T V O SC V O U T V A G C (L) V A G C (H ) V C C = 8V , V in=17dB µN o m odulation H ow ever, S= output at 400H z, 30% m odulation V C C = 8V , fO SC = 108.7M H z M easured by Pin4, N o signal input V C C = 8V , V in= 51dB µ V C C = 8V , V in= 67dB µ V C C = 8V , V in= 53dB µ 219 384 0.05 6.5 435 0.5 dB m V m V V V n Characteristics Curve Level · D iagram Level (dB ) V C C =8V fin=98M H z M od.=22.5kH z fm =1kH z IF : A N 7256 400H z H PF O N Input/O utput C haracteristics Frequency C hange –20 –40 –60 –80 V in (dB µV ) A FO U T (dB ) 400 20 8060 24.5 13.5 8.5 43.5 (m ax.) –10 –15 f in (M H z) V in (dB µV ) 98969088 9492 106 108104102100 V C C =8V fin=1kH z M od.=22.5kH z IF : A N 7256 M ix. IF O U T 0.01µF M S3080 IN IFT 330Ω IF–A m p. 16.0 (m in.) Practical Sensitivity (S/N =30dB ) Lim iting Sensitivity R esidual N oise

ICs for FM/AM T uner AN7280S N o Input IF-Am p. G ain Adjustm ent Pin13 A djusting R esistance (Ω ) G ain (dB ) 0 1k ∞10K V C C = 8V fin = 18M H z R adj. is Piny external resistance (A G C Start Point V ariable) AG C O N Level 110 100 Pin7 V cont in (V ) V in (dB µV ) 2.20 1.41 1.8 4 R adj.= ∞ N o Input Supply Voltage D ependence V C C (V ) Itot (m A ) V ref (V ) 60 2 4 12108 Supply Voltage C hange 110 100 V C C (V ) V in (dB µV ) 86 7 109 V C C = 8V fin = 98M H z N o A djustm ent Pin7 = H IG H Pin9 = H igh Pin9 = Low Local O scillation Level A G C O N Level Practical Sensitivity Lim iting Sensitivity Total G ain Tem perature C haracteristics –10 Ta (˚C ) Total G ain (dB ) 20 400–40 –20 10060 80 0dB = 43.5dB V ref Itot Supply Voltage D ependence V C C (V ) A G C O U T V t (V ) SSC O N Level (V ) 85 6 7 11 12109 SSC O N Level V t IC for IF/D ET is norm al tem perature M ixer+IF–A m p. V C C = 8V Tem perature C haracteristics Ta (˚C ) V in (dB µV ) 0–60 –40 –20 60 80 1004020 Practical Sensitivity (S/N =30dB ) Lim iting Sensitivity A G C O N Level (m ax. G ain) AG C Start Point Tem perature C haracteristics 105 100 Ta (˚C ) V in (dB µV ) 20 400–40 –20 10060 80 Pin7=1V Pin6=G N D Pin9=O PEN Pin7=H IG H Pin6=G N D Pin9=O PEN Pin7=H IG H Pin6=O PEN Pin9=5V Pin7=H IG H Pin6=O PEN Pin9=O PEN f=10.7M H z IF A m p.Input O utput 330Ω 27dB R adj.= 0Ω Am p. G ain Adjustm ent w ith AG C110 100 Pin6 A djusting R esistance (Ω ) A G C O N Level (dB µV ) 0 1k ∞10K

AN7280S ICs for FM/AM T uner IF Am p. O utput Saturation Level Tem perature C haracteristics Ta (˚C ) IF A m p. O utput Saturation Level (dB ) 20 400–40 –20 10060 80 V C C =8V SSC O N Level Tem perature C haracteristics Ta (˚C ) Pino V oltage (V ) 20 400–40 –20 10060 80 SSC Input Pin G N D PIN D A G C R F IN Pass C on. M ix O U T M ix O U T IF IN IF G ain A dj Pass C on. IF O U T E B Pass C O SC O U T A G C

2 Loop

K V C –1340 120kΩ 3pF 12pF 56pF 56pF 0.01µF 0.001µF 1µF 0.01µF 180kΩ 0.01µF To IF 0.01µF 0.01µF 4pF 470Ω 330Ω C –F 0.01µF 1kΩ 0.001µF 15pF 0.01µF 12pF 820Ω 22Ω330Ω 100kΩ 100kΩ 82kΩ 18pF 3SK 1311 K V C –1340 100kΩ 18pF0.001µF M A 551 A N T K V C –1340 100kΩ V T 0V0V 5V 5V C ontrol V oltage A t Search A t N orm al Produced by M A TSU SH ITA IFT : ZIF–5EF021B V C C n Application Circuit

ICs for FM/AM T uner AN7280S n Pin D escriptions Equivalent C ircuitPin N am ePin N o. D escription

1 O SC Em itter Local oscillation transistor em itter pin

2 O SC B ase Local oscillation transistor base pin

3 O SC B y-pass

4 O SC B uffer O utput Pin for output O SC signal to pre-scaler

5 Level D etection O utput

6 A G C – A m p. G ain A djustm ent

7 C ontrol Signal Input

8 G N D

9 SSC Input

10 V C C

A G C signal output pin for R F-A m p. secondary gate Pin for adjusting A G C A m p. gain by external resistance Pin for adjusting A G C -A m p. gain through input of control signal from IF section Pin for adjusting A G C -A m p. gain through input of control signal from m icrocom puter V ref by-pass pin for m ixer,O SC buffer,O SC section V ref V ref 750Ω V C C .70µA 5.6kΩ 1.5kΩ 1.5V V ref 70kΩ 39kΩ

AN7280S ICs for FM/AM T uner n Pin D escriptions (C ont.) Equivalent C ircuitPin N am ePin N o. D escription 12 IF-A m p. B y-pass IF-A m p. by-pass pin 14 IF-A m p. Input IF-A m p. input pin 11 IF-A m p. IF-A m p. output pin M ix. O utput

19 A D X O utput

20 G N D O scillator G N D

PIN diode driver output pin D eterm ine m axim um current to PIN diode by Pin19 external resistance value. 17 M ix. B y-pass M ixer by-pass pin 18 M ix. Input M ixer input pin 13 IF-A m p. G ain A djustm ent Pin for adjusting IF-A m p. gain by external resistance M ixer output pin V C C 240Ω 3kΩ ZO U T.300Ω 330Ω 12kΩ 340Ω 15 16 2.2kΩ 2.2kΩ

ICs for FM/AM T uner AN7280S n O perational D escription

• Loop AG C The A N 7280S uses 2Loop A G C for A G C circuit. 2Loop A G C controls A G C output by using m ixer output (IFT first side) signal and FM –IF control voltage (level m eter output), w hich is a very favorable system for disturbance characteristics, etc. R F–A m p. M ixer IFT IF–A m p. C ontrol V oltage O utput To N .C .
• A G C start point (M ixer input level at V A G C < 3V ) changes in proportion to Pin6 external resistance (follow ing R 1) , Pin 7 applied voltage (D eterm ine IF control voltage by R 2, R 3 resistance division) SSC O N /O FF
• V ariable w idth at R 1 28dB (how ever, V 7 ‡3V , V 9 = 0V )
• V ariable w idth at R 7 40dB (how ever, R 1= ∞ , V 9= 0V )
• V ariable w idth at R 9 10dB (how ever, R 1= ∞ , V 7 ‡3V ) V A G C about 4.7V 5 6 7 9 R 1 R 2 R 3 V R EF A G C O utput A G C –A dj V cont IN SSC IN from m icrocom puter FM –IF C ontrol voltage
• SSC C hange A G C start point by m icrocom puter control signal at seek/reception tim e. * SSC is designed as precondition for sw itching operation at m icrocom puter control signal. FM –IF A G C A m p. A G C D et.