Ordering number: EN 729E Monalithic Linear IC LA1140 FM IF System for Car Radio Package Dimensions Overview The LA1140 is an IF system IC designed for FM car stereo receivers. It features versatile muting characteristics and allows receiver designers to realize the muting performance according to their design concept. Since the muting characteristics can be varied with a switch or a semi-fixed resistor, DX-Local switching will be accomplished with ease. unit : mm 3020A-SIP16 [LA1140] Functions . IF amplification/limiter . Quadrature detector . AF preamplifier . AFC output . Signal meter output . AGC output . Muting bandwidth . Muting under weak signal strength SANYO : SIP16 Features . Versatile muting a) When muting operation is performed under a weak signal strength, an attenuation slope of the audio output against the input signal strength variations can be set at any given value. b) Maximum muting attenuation can be selected to be approximately 6 to 40 dB. c) Input signal strength level which actuates the muting circuit can be set freely. High limiting sensitivity (25 dBµ typ. with muting off) provides a fine quieting characteristic. High S/N (78 dB typ.) Low distortion (0.05% typ.) avaiable if used with double-tuned circuits. Good AMR (63 dB typ. with 6 stages of differential IF amplifiers). Signal meter drive output proportional to the input signal strength in dB (suitable to control multiplex IC LA3370). Clamped (±VBE) AFC output, bandwidth adjustable. Delayed AGC output for front end circuit. Small space factor due to single-ended package employed. 3 mm pitch of pin terminals permitting ease-to-write PC board pattern. . . . . . . . . . SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 93097HA(II)/D0994JN/N257TA/4105MW/3233KI,TS O090KI No.729-1/15 LA1140 Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Maximum supply voltage VCC max Pin 12 16 V Maximum supply current ICC max Pin 12 40 mA Allowable power dissipation Pd max Input voltage VIN Flow-in current Flow-out current Conditions Ratings Unit Ta = 25°C 640 mW Ta = 70°C 460 mW Pin 1 to 2 ±1 Vp-p I2 Pin 2 ±0.2 mA I3 Pin 3 ±0.2 mA I6 Pin 6 2 mA I5 Pin 5 1 mA I13 Pin 13 2 mA I14 Pin 14 2 mA I15 Pin 15 1 mA I16 Pin 16 1 mA Operating temperature Topr –20 to +70 °C Storage temperature Tstg –40 to +125 °C Ratings Unit Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage Operating voltage range Conditions VCC VCC op 8 V 7.5 to 16 V Operating Characteristics at Ta = 25°C, VCC = 8 V, f = 10.7 MHz, See specified Test Circuit Parameter Quiescent current Current drain Demodulation output Total harmonic distortion Signal-to-noise ratio Input limiting voltage Muting sensitivity Symbol ICCO ICC VO THD S/N VIN (lim) VIN (Mute) Muting attenuation (1) Mute (ACC) Muting attenuation (2) Mute (ACC) Muting bandwidth BW (Mute) AM rejection ratio AMR Muting drive output Muting drive output Signal meter output Signal meter output Signal meter output Signal meter output AGC output (1) AGC output (2) Offset voltage (1) Offset voltage (2) (1) (2) (3) (4) V14-0 V14-100 V15-0 V15-50 V15-70 V15-100 V16-0 V16-100 V7-13 V8-13 Conditions Quiescent VIN = 100 dBµ VIN = 100 dBµ, 400 Hz 100% mod. VIN = 100 dBµ, 400 Hz 100% mod. VIN = 100 dBµ, 400 Hz 100% mod. VO: 3 dB down, 400 Hz 100% mod. V14 = 2.0 V V6 = 2.0 V (22 kΩ), VIN = 100 dBµ, 400 Hz 100% mod. V6 = 5.0 V (22 kΩ), VIN = 100 dBµ, 400 Hz 100% mod. VIN = 100 dBµ, V14 = 2.0 V VIN = 100 dBµ, FM 400 Hz 100% mod., AM 1 kHz 30% mod. Quiescent VIN = 100 dBµ Quiescent VIN = 50 dBµ VIN = 70 dBµ VIN = 100 dBµ Quiescent VIN = 100 dBµ Quiescent, pin 7 to 13 Quiescent, pin 8 to 13 min 15 20 200 22 typ 21 25 260 0.05 78 25 26 10 15 20 dB 24 28 32 dB 140 210 370 kHz 50 63 3.5 0 0 0.8 1.6 4.5 3.5 0 –0.25 –0.5 4.2 0 0.1 1.4 2.4 5.3 4.1 0.02 0 0 72 max Unit 27 mA 30 mA 320 mVrms 0.2 % dB 29 dBµ 32 dBµ dB 5.0 0.3 0.3 2.0 3.2 6.0 4.5 0.3 +0.25 +0.5 V V V V V V V V V V No. 729-2/15 LA1140 Equivalent Circuit Block Diagram AC Test Circuit T1: CBTKAC-24782 AUO (Toko Co.) T2: CBTKAE-24783X (Toko Co.) 22µH: S-220J (Korin Co.) Input signal strength is an actual input at pin 1 Signal strength Ind. Unit (resistance: Ω, capacitance: F) Muting Characteristic AF output AF output The muting operation in the LA1140 is performed by an AF preamplifier, the gain of which varies continuously with control current, and a muting drive output circuit which supplies the control current. The gain of the AF preamplifier decreases with increasing gain control current applied to pin 6. However, the gain does not decrease further when the control current reaches approximately 120 µA or greater. The lower limit of the gain under this condition depends upon a resistor connected between pin 5 and GND, and the higher the resistance the lower the gain (the higher the attenuation). Thus the maximum muting attenuation will be set by connecting the resistor between pin 5 and GND. R5-G (lower) 20 kΩ R5-G (higher) 100 kΩ No. 729-3/15 LA1140 Since the muting control input pin 6 is connected to the base of the emitter grounded transistor (through a protection resistor of 500 Ω in series), the voltage between pin 6 and GND is about 0.6 V when the control current is applied. In actual cases, the muting operation is accomplished by applying a voltage drive type muting drive output (pin 14 to pin 6 through a high resistance (up to 20 kΩ)). Unit (resistance: Ω) The muting drive output comes in three types: 1) Hole detector output which develops a voltage when C/N (carrier-to-noise ratio) lowers under weak signal input conditions. 2) A reversed output of the signal strength indicating output (output at pin 15) 3) A bandwidth limited muting drive output which develops a voltage when the AFC output becomes higher than ±VBE during tuning-off operation. All these outputs are led to an OR circuit and the processed output is developed at pin 14. Of the above muting drive outputs, descriptions on the hole detector output and the bandwidth limited muting drive output will be omitted, since they are the same as those used in conventional quadrature detector ICs (such as LA1230, LA1231N). The inverted output of the signal strength indication output is obtained as illustrated below. Inverter Inverter Inverter (AGC output) (Signal meter output) (Offset) (Muting drive output) By referring to the illustration, V14 is given by the formula: V14 = Vr – (IO + I1 – aI2)RL – VBE. Conditions are: Vr ≅ 4.9 V, IO ≅ 0.2 mA, a ≅ 2, RL = 22 kΩ, VBE ≅ 0.6 V, I1 = V15/R15-G, I2 = V16/R16-G where V16 is a constant equal to 4.1 V (typ) for medium or lower signal input levels, where the muting drive output is required. Since the V15 increases proportionally to the increase of the input signal strength, I1 will also increase. Therefore the V14 will decrease with increasing signal strength. Thus the required muting drive output can be obtained by selecting proper values of R15-G and R16-G. For example, the muting drive output moves toward strong input signal level if the R16-G is decreased, or the muting drive output becomes zero due to the offset current IO under a weak signal input condition, if the R16-G is increased to infinity (namely pin 16 is opened). However the muting drive output caused by a whole detector still exists in this case. Increasing R15-G decreases the slope of the curve for the muting drive output vs. antenna signal input level, or decreasing the R15-G increases the slope of the curve. Furthermore, varying the value of a resistor connected between the muting drive output (pin 14) and the muting control input (pin 6) changes the value of ANT Input the muting control current required to obtain the same muting drive output, accordingly the slope of the curve for muting attenuation vs. antenna signal input level is also changed. These characteristics investigated by using an actual receiver are shown on the curves below. The general method to adjust the muting circuit of the LA1140 is: to set the signal input level required to actuate the muting circuit with the R16-G, to adjust the slope of the curve for the muting attenuation vs. antenna signal input with the R15-G, and to adjust the maximum muting attenuation (determined by setting the noise level at no signal) with the R5-G. The slope of the curve for the muting attenuation vs. antenna signal input level can also be adjusted by the resistor connected between pins 14 and 6 in addition to R15-G, however, selecting a resistor too high does not allow the muting control current flowing into pin 6 to reach 120 µA even through the maximum muting drive output (V14) is applied, namely the muting attenuation does not reach its maximum value. Accordingly a recommended value of the resistor between pins 14 and 6 is about 22 kΩ. No. 729-4/15 Allowable power dissipation, Pd max – mW AF Output LA1140 R15-G higher AF Output ANT Input Muting by varying R15-G R14-6 lower Ambient temperature, Ta – °C f = 10.7 MHz, non-modulation Pin voltage V14, V15, V16 – V Demodulation output VO, distortion THD,– dB AM rejection AMR, Noise NO ANT Input Muting by varying R14-6 Noise Muting = OFF Input voltage, VIN (pin 1) – dBµ Muting attenuation, Mute (Att) – dB Demodulation output, VO – dB Input voltage, VIN (pin 1) – dBµ fO = 10.7 MHz VIN = 100 dBµ Pins 7 – 13 = 5.1 kΩ Frequency detuned, ∆f – kHz V6 through 22 kΩ – V Current drain, ICC – mA Bandwidth muting drive output, V14 – V Resistance between pin 5 and GND – Ω VCC = 8 V Resistance between pin 5 and GND is 100 kΩ 1 Tuned, muting OFF 2 – 200 kHz detuned, muting OFF 3 – 200 kHz detuned, muting ON Input voltage, VIN (Pin 1) – dBµ No. 729-5/15 Muting drive output, V14 – V Muting bandwidth, BW (Mute) – kHz LA1140 Resistance between pins 7 and 13, R7-13 – Ω Demodulation output, VO – mVrms Input limiting voltage, VIN(lim) – dBµ Quadrature signal, V11 – dBµ Ambient temperature, Ta – °C VCC = 8 V, f = 10.7 MHz Non-modulation VCC = 8 V, f = 10.7 MHz Non-modulation Quiescent current, ICCO – mA Current drain, ICC Muting sensitivity, VIN(Mute) – dBµ Ambient temperature, Ta – °C Ambient temperature, Ta – °C VCC = 8 V, VIN = 100 dBµ Non-modulation Ambient temperature, Ta – °C ICCO (quiescent) Ambient temperature, Ta – °C Muting attenuation, Mute (Att) – dB Muting bandwidth, BW (Mute) – kHz f = 10.7 MHz, non-modulation VCC = 8 V Ambient temperature, Ta – °C No. 729-6/15 VCC = 8 V, f = 10.7 MHz Non-modulation Quiescent Signal meter output, V15 – V Muting drive output, V14 – V LA1140 VCC = 8 V f = 10.7 MHz Non-modulation Quiescent Ambient temperature, Ta – °C AGC output, V16 – V VCC = 8 V, f = 10.7 MHz Non-modulation Quiescent AM rejection ratio, AMR – dB Ambient temperature, Ta – °C Ambient temperature, Ta – °C Tuning error, ∆fO – kHz VIN = 100 dBµ, non-modulation V7 to 13 = 0 Demodulation output, VO – mVrms Ambient temperature, Ta – °C Supply voltage, VCC – V Muting sensitivity, VIN(Mute) – dBµ Input limiting voltage, VIN(lim) – dBµ Supply voltage, VCC – V Supply voltage, VCC – V f = 10.7 MHz Non-modulation Supply voltage, VCC – V No. 729-7/15 AM rejection ratio, AMR – dB Signal to noise ratio, S/N – dB LA1140 Supply voltage, VCC – V Muting attenuation, Mute (Att) – dB Muting bandwidth, BW (Mute) – kHz Supply voltage, VCC – V f = 10.7 MHz Non-modulation ICCO (quiescent) Supply voltage, VCC – V Muting drive output, V14 – V Quiescent current, ICCO – mA Current drain, ICC Supply voltage, VCC – V VIN = 100 dBµ Non-modulation Quiescent f = 10.7 MHz Non-modulation Supply voltage, VCC – V Supply voltage, VCC – V f = 10.7 MHz Non-modulation AGC output, V16 – V Signal meter output, V15 – V f = 10.7 MHz Non-modulation Quiescent Quiescent Supply voltage, VCC – V Supply voltage, VCC – V No. 729-8/15 LA1140 Proper cares in using LA1140 1) 2) 3) The detector transformers should be designed to develop a quadrature signal (pin 11) of higher than 175 mVrms (approximately 105 dBµ) under high antenna signal input. If the quadrature signal strength is less than 125 mVrms, the muting drive output (V14) cannot decrease to zero even in a strong signal strength. Furthermore, when the quadrature signal strength lies between 125 mV and 175 mV, the muting drive output may move from zero to plus under high temperature conditions. When designing a PC board, special care should be given to the ground pattern layout by referring to that of the recommend PC board example as shown below. Do not connect a capacitor directly between pin 16 and ground. If the signal intensity of IF input varies in the vicinity of 90 dBµ, the voltage at pin 16 varies. Thus, charging/discharging current flows into the capacitor and goes to the muting drive output (pin 14) through the inverter inside the IC, thereby causing the muting to malfunction. Sample Application Circuit 1 Front end TOKO higher [Maximum Att. Adj.] lower [Muting ON level Adj.] [Slope Adj.] [Slope Adj.] Unit (resistance: Ω, capacitance: F) No. 729-9/15 LA1140 Sample Printed Circuit Pattern (Cu-foiled side 45 × 75 mm2) connected between pin 16 and GND varied. (Muting threshold level adjustment) Demodulation output, Noise – dB . Variations of muting characteristics with a resistor Demodulation output Mute OFF Mute ON Noise ANT Input – dBµ ANT Input – dBµ No. 729-10/15 . Variation of muting characteristics with a resistor connected between pin 15 and GND varied. (Slope adjustment 1 of the curve for muting attenuation vs. antenna signal input level) Demodulation output, Noise – dB LA1140 Mute OFF R15 – GND = 22 k Adjustment output Mute ON Noise ANT input – dBµ Unit (resistance: Ω, capacitance: F) . Variations of muting characteristics with a resistor connected between pins 14 and 6 varied. (Slope adjustment 2 of the curve for muting attenuation vs. antenna signal input level) Demonstration output, Noise – dB ANT input – dBµ Demodulation output Mute OFF Mute ON Noise ANT input – dBµ Unit (resistance: Ω, capacitance: F) ANT input – dBµ No. 729-11/15 . Variations of muting characteristics with a resistor connected between pin 5 and GND varied. (Adjustment of the maximum muting attenuation) Demodulation output, Noise – dB LA1140 R5 – GND = 200k Demodulation output Noise ANT input – dBµ Unit (resistance: Ω, capacitance: F) ANT input – dBµ Sample Application Circuit 2 High Frequency Section of Car Radio and Car Stereo with Noise Canceller and FM Stereo Multiplexer Almost all noise under a medium and lower input signal strength can be rejected by processing the muting characteristic of the LA1140, the stereo noise control (SNC) characteristic and the high cut control characteristic of the LA3370. These examples are as follows: Front end Sample application of LA1140, LA3370 No. 729-12/15 LA1140 Circuit Diagram Separation adjustment Oscilloscope Pilot cancel Ceramic oscillator Unit (resistance: Ω, capacitance: F) No. 729-13/15 LA1140 SNC Characteristic VO, NO – ANT IN Demodulation output, Noise – dB LA1140 signal meter output, V15 – V Signal Meter Output V15 – ANT IN Stereo Monaural ANT input – dBµ HCC Characteristics VO – ANT IN Stereo separation – dB Demodulation output, Noise – dB ANT input – dBµ Demodulation output, Noise – dB Demodulation output – dB ANT input = 10 dBµ Stereo Monaural Separation, Sep – dB Signal meter output, V15 – V Muting ANT input – dBµ Modulation frequency – Hz Separation Hcc ON ANT input – dBµ Overall muting characteristic by SNC, HCC ANT input – dBµ Frequency characteristic of demodulation output by HCC Signal meter output Hcc OFF, monaural ANT input – dBµ No. 729-14/15 LA1140 Item Manufacturer Double tuning Toko Sumida Single tuning Type Number Pri. CBTKAC-24782AUO Sec. CBTKAE-24783X Pri. 0232-702-066 Sec. 0232-702-067 Package Fixed Inductor Damping Resistor 10 mm sq. 10 mm sq. 22 µH 10 kΩ 2.7 kΩ 7 mm sq. 7 mm sq. 22 µH 10 kΩ 2.7 kΩ Toko 119AC-14086Z MTKAC-25639Z 7 mm sq. 10 mm sq. 22 µH 22 µH 10 kΩ 10 kΩ Korin 57-1011-01 59-1167-04 7 mm sq. 10 mm sq. 22 µH (22 µH*) 22 kΩ 5.6 kΩ Sumida 24M-190-268 24M-190-267 7 mm sq. 10 mm sq. 22 µH 22 µH 5.6 kΩ 5.6 kΩ Sankyo DC-11 7 mm sq. (22 µH*) 10 kΩ Note *:Included *:Included 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. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 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: 2 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. 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 provides information as of September, 1997. Specifications and information herein are subject to change without notice. No. 729-15/15