UNISONIC TECHNOLOGIES CO., LTD ULA1145 Preliminary CMOS IC FM TUNER IF SYSTEM DESCRIPTION The UTC ULA1145 is a high integrated IC for FM tuner IF stage, special in car radio. FEATURES * Built-in IF count buffer circuit and microprocessor-controlled switch circuit for ETR * High S/N * Wide range output * More simplifies design: - Built-in SD circuit—regulable sensitivity independently of soft mute characteristics - Variable S-meter gradient—output with three pins ORDERING INFORMATION Ordering Number ULA1145G-N20-R Package HTSSOP-20 Packing Tape Reel MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 10 QW-R106-006.a ULA1145 Preliminary PIN CONFIGURATION NC 1 CMOS IC 20 NC 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 PIN DESCRIPTION PIN NO. 1, 20 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 PIN NAME NC IFIN IFBIAS IFGND Msc MGC MAC AFOUT AFCOUT IFOUT QIN VREG VCC IFCT GND MDRI SOUT SDCT SDOUT DESCRIPTION IF input IF amp bias IF amp GND Mute start control Mute gradient control Mute attenuation control AF output AFC output IF output Quadrature detection input Voltage regulator output VCC IF count output, control GND for detection circuit Mute driver S-meter output SD sensitivity control SD output UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 10 QW-R106-006.a ULA1145 Preliminary CMOS IC PIN FUNCTIONS PIN NO. Function 2 IF input 3 Bias pin 4 GND 5 Soft mute start point control Internal Equivalent Circuit Notes 2 IF limiting amp GND For setting the soft mute starting point. 5 6 Can be used for S-meter output. For setting the mute gradient from the soft mute starting point to the noise finishing point. Soft muting gradient control pin 6 7 For setting amount of mute attenuation. The demodulation level changes when the external resistance value is varied. Mute Att 7 8 FM-AF output 9 AFC input UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 10 QW-R106-006.a ULA1145 Preliminary CMOS IC PIN FUNCTIONS(Cont.) PIN NO. Function 10 IF output Internal Equivalent Circuit Notes Output to the phase circuit IF input via the phase shift circuit. The mute circuit malfunctions and demodulation output decreases if the voltage level at this pin drops below 180mV. 11 IF input 12 Vref 4.8V 13 VCC Supply voltage 7.5~14V 14 IF buffer output 15 GND 16 Mute driver 17 S-meter output 18 SD sensitivity setting 19 SD output UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Amount of mute attenuation depends on and is controlled by the voltage at this pin. PNP open collector output Can be used for S-meter output High active 4 of 10 QW-R106-006.a ULA1145 Preliminary CMOS IC BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 10 QW-R106-006.a ULA1145 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING (TA=25°C) PARAMETER SYMBOL RATINGS Maximum Supply Voltage Pin 13 VCC 14 Maximum Supply Current Pin 13 ICC 45 TA=70°C, Mounted On PC Board 630 Allowable Power TA=25°C, Mounted On PC Board, PD 630 Dissipation Independent IC TA=70°C, Independent IC 360 Operating Temperature TOPR -20~+70 Storage Temperature TSTG -40~+125 Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. mW mW °C °C OPERATING CONDITIONS (TA=25°C) PARAMETER Recommended Supply Voltage Operating Voltage Range UNIT V mA mW SYMBOL VCC VCC op RATINGS 8 7.5~14 UNIT V V ELECTRICAL CHARACTERISTICS (TA=25°C, VCC=8V, fin=10.7MHz) PARAMETER Quiescent Current Current Drain Demodulation Output Total Harmonic Distortion Signal-to-Noise Ratio Input Limiting Voltage Muting Sensitivity Muting Bandwidth Muting Attenuation Signal Strength Indication Output Muting Drive Output AM Rejection Ratio Offset Voltage SD Sensitivity IF Count Output Level SYMBOL TEST CONDITIONS ICCO VIN=0dBμ ICC VIN=100dBμ VO VIN=100dBμ, 400Hz Tone, 100% VIN=100dBμ, 400Hz Tone, 100%, Single THD Tuning Coil S/N VIN=100dBμ, 400Hz Tone, 100% VIN (lim) 400Hz Tone, 100%, Soft Mute ON VIN (mute) V16=2V BW(mute) VIN=100dBμ, V19≤0.3V VIN=100dBμ, V16=2V, 400Hz Tone, mute(1) 100% VIN=100dBμ, V16=4V, 400Hz Tone, mute(2) 100% V17-0 VIN=0dBμ, R16=10kΩ, Pin 17 V17-50 VIN=50dBμ, R16=10kΩ, Pin 17 V17-70 VIN=70dBμ, R16=10kΩ, Pin 17 V17-100 VIN=100dBμ, R16=10kΩ, Pin 17 V16-0 VIN=0dBμ, Pin 16 V16-100 VIN=100dBμ, Pin 16 AMR VIN=100dBμ, 1kHz Tone, 30% AM V8-12 VIN=0dBμ, Pins 8 to 12 VIN=0dBμ, Pins 9 to 12 V9-12 VSD Pin 19 VIF-ON VIN=100dBμ, Pin 14, CL=10pF VIF-OFF VIN=100dBμ, Pin 14, CL=10pF UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 18 20 300 TYP 26 29 400 MAX UNIT 36 mA 40 mA 520 mVrms 0.3 0.8 % 75 34 30 140 85 40 36 190 46 42 280 dB dBμ dBμ kHz 10 15 20 dB 25 29 33 dB 0 1.4 2.5 5.0 4.0 0 57 -0.25 -0.5 50 110 0.1 2.3 4.5 5.5 4.8 0 70 0 0 58 180 1 0.6 3.2 5.5 6.0 5.5 0.3 V V V V V dB dB +0.25 V +0.5 V 66 dBμ 280 mVrms 3 mVrms 6 of 10 QW-R106-006.a ULA1145 Preliminary CMOS IC SD OUTPUT CIRCUIT 1. Hole detector Mute driver 16 Signal meter Bandmute 19 SD output Comparator Exhibit hysteresis 18 As shown, the SD output is the logical AND of the band mute and S-meter comparator outputs. 2. Signal search using the SD output circuit 2-1 The transition response characteristics of the SD output circuit depends on the time constants of pins 16, 17, 18 and 9. As the SD output transition response characteristics are determined by the pin with the largest time constant, erroneous stopping will result when a search time is less than the largest one. 2-2 Band mute range circuit time constant (pin 9) An equivalent circuit to the band circuit is shown below. VREF 12 RAFC 9 C Mute switch circuit UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 10 QW-R106-006.a ULA1145 Preliminary CMOS IC SD OUTPUT CIRCUIT(Cont.) (1) Current path during detuning 12 RAFC 12 9 RAFC 9 C C (2) Current return path from detuning 12 9 RAFC C I=0 As can be seen from the above circuit diagrams, the time constant during detuning is determined by the internal PNP resistance, the NPN collector resistance and the capacitance of the externally-mounted capacitor. This time constant is determined by the external resistance RAFC and capacitor C. This time constant, τ = RAFC×C, must be set depending on the required search time. 3. Narrow-band SD output circuit An IF count circuit is provided for equipment compatibility for the European marketplace. However, if the band is made narrow using only the SD circuit, there is a tendency for the number of erroneous stops caused by an undesired signal to increase. To prevent this, two threshold voltages should be used to control the SD circuit. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 10 QW-R106-006.a ULA1145 Preliminary CMOS IC SOFT MUTE CHARACTERISTICS 1. Control The S/N setting (C/N) for weak inputs and the -3dB limiting sensitivity can be controlled by obtaining the proper value for the un-soft muted input/output signal characteristic. However, usable sensitivity cannot be controlled as this is determined by the front end and IF design which are unrelated to soft muting. 2. Soft mute setting Soft mute operation depends on the S-meter circuit voltage and the hole detection circuit voltage. As shown in the graph on the right, the degree of soft muting correlates with the mute drive voltage, V15. The control signal line of the mute drive voltage switches before and after the 10dBμ ANT divergence point. When adjusting the soft mute with a weak signal which does not affect the S-meter, first adjust it using the hole detection input signal. However, as the S-meter output will readjust the soft mute level, also adjust the soft mute using the S-meter output. At this point, the hole detection output adjusts the gain up to the IF input, causing a variance. Also, the S-meter output is varied by the value of R16. (Mute attenuation) Mute drive voltage V15 Hole detector S-meter (Adjust R4, R5) ANT input level (dBµ) 3. Soft mute transition response characteristic The degree of soft muting automatically varies according to the change in input field strength. Omitting the influence of the front end wideband AGC circuit, the UTC ULA1145’s response speed is dependent on the time constant at pins 16 and 17. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 10 QW-R106-006.a ULA1145 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 10 QW-R106-006.a