Ordering number : EN3044A Monolithic Linear IC LA1061M Antenna Switching Controller Overview Package Dimensions The LA1061M is an antenna switching controller for mobile radio equipment. The LA1061M uses a number of inputs from the receiver circuitry to select the main antenna or sub-antenna according to signal strength and quality. Weak and strong signals are detected with the S-meter DC voltage and F.E. AGC voltage, respectively. Multi-path distortion is detected from the AC component of the IF output, using the same high-sensitivity counter circuit as in Sanyo's earlier LA1060 device. An auxiliary circuit keeps the main antenna selected for a fixed time period when reception conditions outside a moving vehicle are changing rapidly. The LA1061M is available in surface-mount 8-pin DIPs, facilitating construction of compact equipment. It operates from a single 7 to 12V power supply. unit: mm 3111-MFP14S [LA1061M] SANYO: MFP14S Features • Uses Sanyo's proprietary AGC amplifier and detector, providing accurate detection of multi-path distortion. • High-current Main and Sub-antenna switching outputs. • Antenna switching frequency limiting circuit. • On-board comparators for F.E AGC (strong signal) and S-meter DC (weak signal) detection. • Surface-mount 14-pin MFP. Specifications Maximum Ratings at Ta=25°C Parameter Maximum supply voltage Allowable power dissipation Symbol Conditions VCC max Pd max Ratings Unit 14 V 182 mW Operating temperature Topr –30 to +80 °C Storage temperature Tstg –40 to +125 °C Maximum flow-out current I4 I5 I6 Pin 4 1 mA Pin 5 10 mA Pin 6 10 mA I9 I10 Pin 9 2 mA Pin 10 5 mA I12 V13 Pin 12 2 mA Pin 13 V14 Pin 14 VCC VCC Maximum apply voltage V V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 82997HA (KT)/9070TA/6019TA, TS No.3044-1/8 LA1061M Operating Conditions at Ta=25°C Parameter Symbol Recommended supply voltage VCC Operating voltage range VCC op Conditions Ratings Unit 8 V 7 to 12 V Operation Characteristics at Ta=25°C, VCC=8V, f=100kHz sine wave Parameter Current drain Symbol Conditions Ratings min typ max Unit No input, I5 and I6 are not included. 4.5 7 12 mA Pin 5 ‘H’-level voltage ICC V5 1kΩ to ground 5.0 6.0 7.0 V Pin 6 ‘H’-level voltage V6 1kΩ to ground 5.0 6.0 7.0 V Noise amp gain Gv1 VIN=3mVrms, f=100kHz 33 36 39 dB Gv2 VIN=100mVrms, f=100kHz 10 13 16 dB Noise detection sensitivity NDS Noise AGC off 9 12 15 mVrms Noise count number NCN VIN=30mVrms, f=100kHz, sine wave Gate time 1 tG1 Noise AGC off 120 150 180 µs Pin 9 voltage V9 VIN=100mVrms, f=100kHz, 7.0 7.7 8.0 V Strong signal comparator Vth14 0.8 1.0 1.2 V Vth13 1.8 2.0 2.2 V 10 R9=300kΩ threshold Weak signal comparator threshold Gate time 2 tG2 2 4 6 ms Gate time3 tG3 13 23 40 ms Switching frequency HCN 15 limit maximum count Equivalent Circuit Block Diagram Unit (resistance : Ω) No.3044-2/8 LA1061M Operating Characteristic Test Circuit Sample Application Circuit Unit (resistance : Ω, capacitance : F) Unit (resistance : Ω, capacitance : F) Sample Printed Circuit Pattern No.3044-3/8 LA1061M Functional Description General Operation The LA1061M has two inputs for weak and strong signal detection, and one for multi-path distortion detection. It has two outputs for Main and Sub-antenna selection, one of which is selected according to the state of the inputs. Both outputs can directly drive an antenna switching pin diode. Signal Strength Detection Each signal strength detection input has a built-in comparator. The weak signal comparator (pin 13) is driven by the S-meter DC voltage and has a threshold of approximately 2V. The antenna switching logic selects the Main antenna when the voltage on this pin is lower than the threshold, regardless of the state of the other inputs. The strong signal detector (pin 14) is driven by the F.E. AGC voltage and has a threshold of approximately 1V. The antenna switching logic selects the Sub-antenna if the voltage on this pin is lower than the threshold, the weak signal comparator is off, and the multi-path distortion detector is not already on. Pin Description Pin No. 1 Function Multi-path Distortion Detection The IF output signal is high-pass filtered and the resulting noise signal input through a coupling capacitor to pin 1, the LA1061M amplifies this signal and applies AGC to it. The AGC amplifier is designed to detect multi-path distortion without amplifying noise due to a weak IF signal. The number of noise pulses within the period set by the time constant on pin 4 is counted. If it exceeds a certain limit, and the strong signal detector is not already on, the antenna switching logic selects the Main antenna. Switching Frequency Detection The LA1061M counts the number of antenna changes within the time interval set by the time constant on pin 12. The internal D/A converter outputs a current on pin 11, which is converted to a voltage by the resistor connected to this pin. If this voltage exceeds a certain value, that is, the switching frequency is too high, the Main antenna is selected for the period set by the time constant on pin 10. The Main antenna is selected for this time regardless of the state of the other inputs. Unit (resistance : Ω, capacitance : F) External circuits Isolate noise components present in the IF output signal with a high-pass filter, and input via a decoupling capacitor. Notes The input impedance of the LA 1061M varies with input level. The minimum value is 10kΩ. Noise input Continued on next page. No.3044-4/8 LA1061M Unit (resistance : Ω, capacitance : F) Continued from preceding page. Pin No. Function 2 H.P.F 3 AGC 4 Mono-stable multi-vibrator 1 External circuits Notes Highpass filter Pin 6 is for MAIN, pin 5 is for SUB. 5 6 Antenna switching outputs 7 GND 8 VCC Continued on next page. No.3044-5/8 LA1061M Unit (resistance : Ω, capacitance : F) Continued from preceding page. Pin No. 9 Function External circuits Notes AGC Voltage output 10 Mono-stable multi-vibrator 3 11 D/A converter 12 Mono-stable multi-vibrator 2 The LA1061M counts antenna switches for the time interval generated by multi-vibrator 2. The internal D/A converter outputs a current on pin 11, which is converted to a voltage by the resistor connected to this pin. If this voltage exceeds a certain value, that is, the switching frequency is too high , multi-vibrator 3 operates to hold the antenna switching outputs at Main for the time set by multi-vibrator 3. The threshold level is set at approximately 2V. 13 Weak signal comparator The threshold level is set at approximately 1V. 14 Strong signal comparator No.3044-6/8 Voltage gain, VG – dB Voltage gain, VG – dB LA1061M Pin 1 Input voltage, VIN1 – dBµ Gate time, tG – µs Gate time, tG – µs Frequency, f – Hz Resistance, R – kΩ Weak Field Detection Level, hy – VCC Resistance,R6 – Ω Comparate Level, hy – Ta Switching frequency detection time – ms Supply Voltage, VCC – V Switching Frequency Detection Time – C12 Hysteresis, hy – dB Comparate level – V Ambient temperature, Ta – °C Hysteresis, hy – dB Pin 6 voltage, V6(H) – V Weak field detection level – V Pin 4 capacity, C4 – nF Pin 12 capacity, C12 – nF No.3044-7/8 LA1061M Antenna Hold Time – C10 Antenna hold time – s Switching frequency detection time – ms Switching Frequency Detection Time – R Resistance, R – kΩ Pin 10 capacity, C10 – µF Antenna hold time – s Antenna Hold Time – R Resistance, R – kΩ 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 lose. 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 responsibilty 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 August, 1997. Specifications and information herein are subject to change without notice. No.3044-8/8