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| Ordering number : EN4930 Monolithic Linear IC LA8670M Double-Conversion Narrow-Band FM IF System Overview The LA8670M is a narrow band FM IF system for use in communication equipment. In addition to the functions required for FM reception, the LA8670M provides a rich set of additional functions including noise detection and field strength detection, and is thus optimal for cordless telephones. Package Dimensions unit: mm 3112-MFP24S [LA8670M] Functions * First mixer, first local oscillator, first local oscillator buffer output, second mixer, second local oscillator * IF amplifier, limiter, quadrature detector * Signal meter * Noise detector, noise amplifier, noise wave detector, Schmitt trigger Features * Low voltage operation: VCC OP = 1.8 to 6 V * Signal meter linear over a wide range (70 dB typical) * High sensitivity, high intercept point SANYO:MFP24S Specifications Maximum Ratings at Ta = 25C Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Ta 75C Conditions Ratings 7.0 150 -20 to +75 -40 to +125 Unit V mW C C Operating Conditions at Ta = 25C Parameter Recommended supply voltage Operating supply voltage Symbol VCC VCC OP Conditions Ratings 3.0 1.8 to 6.0 Unit V V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 52095TH (OT) No. 4930-1/10 LA8670M Operating Characteristics at Ta = 25C, VCC = 3 V, fC (MIX) = 49.830 MHz, fmod = 1 kHz, f = 3 kHz Parameter Quiescent current Mixer intercept point 12 dB sensitivity Demodulator output Signal-to-noise ratio AM rejection ratio Total harmonic distortion Symbol ICCO Ip3 12dB S/N VO S/N AMR THD VSM (1) Signal meter output VSM (2) VSM (3) Noise detector output VND (1) VND (2) V14 (1) V14 (2) VSH (1) VSH (2) GM1 GM2 No input First mixer No input matching Vin = 80 dB No modulation, Vin = 80 dB AM 30% modulation Vin = 80 dB Vin = 0 dB Vin = 40 dB Vin = 80 dB fi = 40 kHz, Vi = -50 dBV fi = 40 kHz, Vi = -30 dBV Schmitt on Schmitt off V14 = 0.8 V V14 = 0.2 V First mixer Second mixer 2.8 19 24 90 First mixer Second mixer First mixer Second mixer 5 330 330 2.0 520 1.10 0.53 0.33 0.05 0.60 1.05 143 60 35 Conditions min typ 7.3 -4.8 3.2 180 67 43 2.2 0.30 0.90 1.40 0.10 1.40 0.63 0.43 3.0 0.65 1.40 1.85 0.25 1.70 0.73 0.53 0.3 5.0 227 max 9.5 Unit mA dBm dB mVrms dB dB % V V V V V V V V V dB dB MHz k k Noise detector level Schmitt output level Mixer conversion gain Mixer input frequency Mixer input resistance Mixer output resistance FM detector output impedance Note: AC levels are all indicated for open (EMF) circuits. No. 4930-2/10 LA8670M Equivalent Circuit Block Diagram No. 4930-3/10 LA8670M Test Circuit No. 4930-4/10 LA8670M Sample Application Circuit No. 4930-5/10 LA8670M Pin Functions Pin No. Symbol Internal equivalent circuit Note 24 1st MIX-IN 2 First mixer inputs 1 1st MIX-IN 1 2 VCC1 Power supply for the first mixer 3 1st OSC 1 Local oscillator inputs 4 1st OSC 2 5 OSC Buffer-OUT Local oscillator buffer output 6 2nd OSC 1 Local oscillator inputs When external insertion is used, input the signal to pin 6 and leave pin 7 open. 7 2nd OSC 2 8 2nd MIX-OUT Second mixer output 9 VCC2 Power supply 10 IF-IN IF amplifier input 11 D.C IF amplifier DC feedback 12 IF-OUT Limiter amplifier output Continued on next page. No. 4930-6/10 LA8670M Continued from preceding page. Pin No. Symbol Internal equivalent circuit Note 13 Quad. Discriminator connection 14 Noise det. Noise detector 15 Schmitt-OUT Noise Schmitt output 16 Signal DET. Field strength signal output 17 AF-OUT FM detector output 18 Filter-IN Noise filter input 19 Filter-OUT Noise filter output 20 2nd MIX-IN 1 Second mixer input 21 2nd MIX-IN 2 Continued on next page. No. 4930-7/10 LA8670M Continued from preceding page. Pin No. Symbol Internal equivalent circuit Note 22 1st MIX-OUT First mixer output 23 GND Ground No. 4930-8/10 LA8670M No. 4930-9/10 LA8670M s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provide information as of May, 1995. Specifications and information herein are subject to change without notice. PS No. 4930-10/10 |
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