ICs for FM/AM Tuner ANS FM Front-end Circuit for Car Radio Overview The ANS is an FM front-end IC designed for DTS except RF amp. of car radio. It is built-in local oscillation frequency buffer output and PIN diode (ADX) driver for antenna damping. Features High sensitivity High S/N ratio Good IM characteristics at strong input Timing for input level is variable. Built-in pre-if-amp. having negative (positive) temperature characteristics to RF amp. Block Diagram GND..±.. 9 ADX Driver OSC Buffer Buffer Mix. & Det..±...±..±. 9...±. -Lead SOP Package (SOP-P-) IF-Amp..±. Unit : mm includes following four Product lifecycle stage. VCC
ANS ICs for FM/AM Tuner Absolute Maximum Ratings (Ta= C) Parameter Symbol Rating Unit Supply Voltage Supply Current Power Dissipation Operating Ambient Temperature Storage Temperature V CC I CC P D T opr T stg Recommended Operating Range (Ta= C) Parameter Symbol Range Operating Supply Voltage Range V CC.V ~ 9.V V in =dbµ no conversion However, S= output at Hz %conversion f OSC =.MHz Measured by Pin, No signal No modulation, V in = dbµ Input level at V = V V in = dbµ V in = dbµ At S ON, difference between input level at V = V and maximum sensitivity V in = dbµ V in = dbµ 9. V ma mw ~ + C ~ + C Electrical Characteristics (V CC = V, f in = 9MHz, Hz %Modulation, S : Open, Ta= C) S/N Ratio Parameter Symbol Condition min. typ. max. Unit Local Oscillation Output Level IF Output Level Maximum Sensitivity Level (L) Level (H) Sensitivity Variable Range ADX Drive Current ADX Leak Current Characteristics Curve Itot (ma) I tot V CC N OUT V OSC V OUT S V (L) V (H) I X(max.) I X(leak). IF OUT (dbµ) IF Amp. Input/Output Characteristics.µF IF IF IN ANS OUT.µF Ω I (V).. Start Point Variable Axis.V Adj. R = Adj. R = includes following four Product lifecycle stage. db mv mv dbµ V V db ma µa IF IN (MHz) 9
ICs for FM/AM Tuner ANS Start Point (dbµ) OSCOUT (dbµ) DTotal G (db) 9 Freq. Characteristics 9 9 fosc =.MHz VCC =V Input Frequency fin (MHz) OSC OUT f OSC Input dbµv from SG to Pin Pin OPEN C =pf C =pf ANS.µF OSC OUT SG C 9 9 fosc (MHz) Mixer + IF Amp. Total Gain Temperature Characteristics VCC =V Total Gain =db at Ta = C T ( C) ON LEVEL (dbµ) V (H) (V) Adj. R ON Level Adj R (Ω) V (H) Supply Voltage Characteristics ON Level Temperature Characteristics 9 Ω +Ω ON LEVEL T ( C) ANS R Adj = ON LEVEL Adj. R R Adj = Ω VADX (V) Saturation Level (mvrms) I ADX V ADX 9 IADX (ma) IF Amp. Saturation Level ON Level V CC Dependence ON LEVEL R Adj = includes following four Product lifecycle stage. ON LEVEL R Adj = Ω
ANS ICs for FM/AM Tuner OSC Buff OUT V CC Dependence Input/Output Characteristics Example Limiting Sensitivity, Usable Sensitivity V CC Dependence (.V) IF : ANS SD (dbµ) 9 9 IF : ANS Limiting Sensitivity, Usable Sensitivity, Temperature Characteristics T ( C) IM Characteristics () fd =9MHz, CW fud=9mhz± fud khz, %Mod. fud=9mhz± fud, CW HzHPF, khz LPF ON IFT CF Matching R To IFT Ω To CF Ω Set SUD and SUD up with the same level, Measure SD level (Referred to Mix. In) which can obtain S/N (db). OSC Buff OUT Usable Sensitivity Limiting Sensitivity Ω Sp F : S Ω Ω AN SUD.µF S SUD To F fud = + Hz, + Hz fud = Hz, + Hz 9 Mixer SUD, SUD (dbµ) Vo (dbµ) VCC = V fin= 9MHz fm = khz, % Mod. Hz HPF khz LPF ON Limiting Sensitivity, Usable Sensitivity, Frequency Characteristics Usable Sensitivity Limiting Sensitivity 9 9 fin (MHz) SUD (dbµ) 9 Usable Sensitivity Limiting Sensitivity IM Characteristics () fd= 9MHz, CW fud= 9MHz + fud khz, % Mod. fud= 9MHz + fud, CW dbµ Measure SUD level (Referred to Mix. In) which can obtain S/N= db IF is ANS Sp SUD SUD SD = dbµ SD = dbµ Mixer.µF AN S fud (MHz) includes following four Product lifecycle stage.
ICs for FM/AM Tuner ANS Application Circuit IFT : EA (MATSUSHITA) Ω Ω.µF kω Ω pf VC kω kω pf VC 9pF 9pF ANS.µF OSC OUT µf 9 Adj. IF OUT pf Ω ANT. Ω pf kω SK kω pf pf kω pf pf pf Pin Diode VVC VC Note) VC ~ VC TOKO KVA kω kω pf IFT Above application circuit and circuit constant indicate only an example. It is not assure the design as mass production set..µf VCC (V) includes following four Product lifecycle stage.
ANS ICs for FM/AM Tuner Pin Descriptions Pin No. Pin Name Typ. Waveform Description Equivalent Circuit Oscillation Emitter.MHz Oscillation transistor's emitter pin Oscillation Base Oscillation transistor's base pin.mhz DC V CC V Main circuit V CC OSC Output Output 9 -Amp. Gain Adjustment IF Amp. Output IF Amp. By-pass IF Amp. Input.V.MHz.MHz.MHz V DC.V Output oscillation signal to microcomputer through buffer. Output signal according to Mix. output dimensions. Adjust -Amp. gain by external resistance. (Refer to P. circuit.) IF signal (.MHz) output pin Z out Ω DC.V IF amp. by-pass control IF signal (.MHz) input pin.mhz Convert RF signal to IF signal and Mix. Output output..mhz Note) Typical waveform frequency is the value when tuning receiving frequency to 9.MHz. + VCC µa includes following four Product lifecycle stage. 9 Ω
ICs for FM/AM Tuner ANS Pin Descriptions (Cont.) Pin No. Pin Name Typ. Waveform Description Equivalent Circuit VCC PIN Diode Driver Output.V.V Drive PIN diode for input attenuate of RF-Amp. Determine drive current by Pin external resistance. Mix.Output Input signal from RF Amp. RF GND Main circuit GND Note) Typical waveform frequency is the value when tuning receiving frequency 9. MHz. Supplementary Explanation used at the ANS uses mixer output (IFT primary side) signal and controls output. RF Amp. + Mixer Amp. Det. IFT V, V V IN (RF) IF Amp. Voltage (V) VCC= V Variable S RAdj. (S variable) includes following four Product lifecycle stage. V V.kΩ.kΩ VIN (RF) (dbµ)
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