ML3371 ML3372 Low Power Narrowband FM IF Legacy Device: Motorola MC3371, MC3372 The ML3371 and ML3372 perform single conversion FM reception and consist of an oscillator, mixer, limiting IF amplifier, quadrature discriminator, active filter, squelch switch, and meter drive circuitry. These devices are designed for use in FM dual conversion communication equipment. The ML3371/ML3372 are similar to the Motorola MC3361/MC3357 FM IFs, except that a signal strength indicator replaces the scan function controlling driver which is in the MC3361/MC3357. The ML3371 is designed for the use of parallel LC components, while the ML3372 is designed for use with either a 455 kHz ceramic discriminator, or parallel LC components. These devices also require fewer external parts than earlier products. The ML3371 and ML3372 are available in dual–in–line and surface mount packaging. • Wide Operating Supply Voltage Range: VCC = 2.0 to 9.0 V • Input Limiting Voltage Sensitivity of –3.0 dB • Low Drain Current: ICC = 3.2 mA, @ VCC = 4.0 V, Squelch Off • Minimal Drain Current Increase When Squelched • Signal Strength Indicator: 60 dB Dynamic Range • Mixer Operating Frequency Up to 100 MHz • Fewer External Parts Required than Earlier Devices • Operating Temperature Range TA = –30° to +70°C 16 1 P DIP 16 = EP PLASTIC PACKAGE CASE 648 16 1 SO 16 = -5P PLASTIC PACKAGE CASE 751B (SO–16) CROSS REFERENCE/ORDERING INFORMATION MOTOROLA PACKAGE LANSDALE P DIP 16 MC3371P ML3371EP SO 16 MC3371D ML3371-5P P DIP 16 MC3372P ML3372EP SO 16 MC3372D ML3372-5P Note: Lansdale lead free (Pb) product, as it becomes available, will be identified by a part number prefix change from ML to MLE. MAXIMUM RATINGS Rating Power Supply Voltage RF Input Voltage (VCC 4.0 Vdc) Pin Symbol Value 4 VCC(max) V16 10 Vdc 1.0 Vrms 16 Unit Detector Input Voltage 8 V8 1.0 Vpp Squelch Input Voltage (VCC 4.0 Vdc) 12 V12 6.0 Vdc Mute Function 14 14 V14 l14 –0.7 to 10 Mute Sink Current 50 Vpk mA Junction Temperature – 150 °C Storage Temperature Range – –65 to +150 °C TJ Tstg NOTES: 1. Devices should not be operated at these values. The “Recommended Operating Conditions” table provides conditions for actual device operation. PIN CONNECTIONS 1 16 Mixer Input 2 15 Gnd Mixer Output 3 14 Mute VCC 4 Limiter Input 5 13 Meter Drive Crystal Osc Decoupling 12 Squelch Input 6 11 Filter Output 7 10 Filter Input Quad Coil 8 Page 1 of 19 ML3371 (Top View) 1 16 Mixer Input 2 15 Gnd Mixer Output 3 14 Mute Crystal Osc 9 Recovered Audio VCC 4 Limiter Input 5 Decoupling 6 Limiter Output 7 Quad Input 8 www.lansdale.com ML3372 (Top View) 13 Meter Drive 12 Squelch Input 11 Filter Output 10 Filter Input 9 Recovered Audio Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. RECOMMENDED OPERATING CONDITIONS Rating Pin Symbol Value Unit Supply Voltage (@ TA = 25°C) ( –30°C TA +75°C) 4 VCC 2.0 to 9.0 2.4 to 9.0 Vdc RF Input Voltage 16 0.0005 to 10 mVrms RF Input Frequency 16 Vrf frf 0.1 to 100 MHz Oscillator Input Voltage 1 80 to 400 mVrms Intermediate Frequency – Vlocal fif 455 kHz Limiter Amp Input Voltage 5 Filter Amp Input Voltage 10 Squelch Input Voltage 12 Mute Sink Current 14 Ambient Temperature Range – Vif Vfa Vsq lsq TA 0 to 400 mVrms 0.1 to 300 mVrms 0 or 2 Vdc 0.1 to 30 mA –30 to +70 °C AC ELECTRICAL CHARACTERISTICS (VCC = 4.0 Vdc, fo = 58.1125 MHz, df = ±3.0 kHz, fmod = 1.0 kHz, 50 Ω source, flocal = 57.6575 MHz, Vlocal = 0 dBm, TA = 25°C, unless otherwise noted) Characteristic Pin Symbol Input for 12 dB SINAD Matched Input – (See Figures 11, 12 and 13) Unmatched Input – (See Figures 1 and 2) – VSIN Input for 20 dB NQS – VNQS Recovered Audio Output Voltage Vrf = –30 dBm – AFO Recovered Audio Drop Voltage Loss Vrf = –30 dBm, VCC = 4.0 V to 2.0 V – Meter Drive Output Voltage (No Modulation) Vrf = –100 dBm Vrf = –70 dBm Vrf = –40 dBm 13 Filter Amp Gain Rs = 600 Ω , fs = 10 kHz, Vfa = 1.0 mVrms – Mixer Conversion Gain Vrf = –40 dBm, RL = 1.8 kΩ – Signal to Noise Ratio Vrf = –30 dBm – Total Harmonic Distortion Vrf = –30 dBm, BW = 400 Hz to 30 kHz – Detector Output Impedance 9 ZO Detector Output Voltage (No Modulation) Vrf = –30 dBm 9 DVO Meter Drive Vrf = –100 to –40 dBm 13 Meter Drive Dynamic Range RFIn IFIn (455 kHz) 13 Mixer Third Order Input Intercept Point f1 = 58.125 MHz f2 = 58.1375 MHz – Mixer Input Resistance 16 Mixer Input Capacitance 16 Page 2 of 19 www.lansdale.com Min Typ Max – – 1.0 5.0 – 15 – 3.5 – µVrms mVrms 120 200 320 –8.0 –1.5 – – 1.1 2.0 0.3 1.5 2.5 0.5 1.9 3.1 47 50 – 14 20 – 36 67 – – 0.6 3.4 – 450 – AFloss MDrv MV1 MV2 MV3 Unit µVrms dB Vdc AV(Amp) dB AV(Mix) dB s/n dB THD % Ω Vdc – 1.45 – – 0.8 – – – 60 80 – – µA/dB MO MVD dB ITOMix dBm – –22 – Rin – 3.3 – kΩ Cin – 2.2 – pF Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. DC ELECTRICAL CHARACTERISTICS (VCC = 4.0 Vdc, TA = 25°C, unless otherwise noted) Pin Characteristic Drain Current (No Input Signal) Squelch Off, Vsq = 2.0 Vdc Squelch On, Vsq = 0 Vdc Squelch Off, VCC = 2.0 to 9.0 V 4 Detector Output (No Input Signal) DC Voltage, V8 = VCC 9 Filter Output (No Input Signal) DC Voltage Voltage Change, VCC = 2.0 to 9.0 V 11 Trigger Hysteresis – Symbol Min Typ Max lcc1 lcc2 dlcc1 – – – 3.2 3.6 1.0 4.2 4.8 2.0 0.9 1.6 2.3 V11 dV11 1.5 2.0 2.5 5.0 3.5 8.0 Hys 34 57 80 Unit mA V9 Vdc Vdc mV Figure 1. ML3371 Functional Block Diagram and Test Fixture Schematic RSSI Output RF Input VCC = 4.0 Vdc FilterIn 0.1 51 k C1 0.01 SqIn 1.0 µF FilterOut 51 1.0 µF 14 15 0.01 510 k Mute 16 470 13 12 11 8.2 k 10 9 Filter – Amp + Squelch Trigger with Hysteresis AF Out to Audio Power Amp AF Amp Demodulator 10 Mixer Limiter Amp 51 k 1.8 k Oscillator 1 53 k 2 3 4 5 6 7 8 15 57.6575 MHz 22 0.1 0.33 Quad Coil TOKO 2A6597 HK (10 mm) or 7MC–8128Z (7 mm) 0.1 20 k 0.001 muRata CFU455D2 or equivalent Page 3 of 19 www.lansdale.com 0.1 Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. Figure 2. ML3372 Functional Block Diagram and Test Fixture Schematic RSSI Output RF Input VCC = 4.0 Vdc FilterIn 0.1 51 k C1 0.01 SqIn 1.0 µF FilterOut 51 1.0 µF 14 15 0.01 510 k Mute 16 470 13 12 11 8.2 k 10 Filter – Amp + Squelch Trigger with Hysteresis AF Out to Audio Power Amp 9 AF Amp Demodulator 10 Mixer Limiter Amp 53 k Oscillator 1 2 3 4 15 57.6575 MHz 22 5 6 R10 1.8 k 0.33 C12 0.1 7 C13 0.1 R11 51 k 8 C14 27 R12 4.3 k muRata CDB455C16 0.001 muRata CFU455D2 or equivalent Page 4 of 19 Ceramic Resonator www.lansdale.com C15 0.1 Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. TYPICAL CURVES (Unmatched Input) Figure 4. RSSI versus RF Input 5.0 70 VCC = 4.0 Vdc RF Input = –30 dBm fo = 10.7 MHz 4.0 50 3.0 2.0 TA = –30°C 40 TA = 25°C 30 VCC = 4.0 Vdc fo = 10.7 MHz 20 1.0 10 0 –55 –35 –15 5.0 25 45 85 65 TA, AMBIENT TEMPERATURE (°C) 105 TA = 75°C 0 –140 –120 125 –100 TA = –30°C –80 –60 –40 Figure 5. RSSI Output versus Temperature –30 dBm MIXER OUTPUT (dBm) VCC = 4.0 Vdc fo = 10.7 MHz 42 36 30 –70 dBm 24 100 MHz Desired Products –10 18 –20 100 MHz 3rd Order Products –30 –40 –50 12 VCC = 4.0 Vdc TA = 27°C –60 6.0 –110 dBm 0 –55 –35 –15 25 45 65 5.0 85 TA, AMBIENT TEMPERATURE (°C) 105 –70 – 70 125 – 60 – 50 – 40 – 30 – 20 – 10 0 10 RF INPUT (dBm) Figure 7. Mixer Gain versus Supply Voltage 30 27 Figure 8. Mixer Gain versus Frequency 40 TA = 75°C VCC = 4.0 Vdc TA = 27°C RFin = –40 dBm 21 TA = –30°C MIXER GAIN (dB) 24 RSSI OUTPUT ( µ A) 20 Figure 6. Mixer Output versus RF Input 48 TA = 25°C 18 15 12 fo = 10.7 MHz RFin –40 dBm 1.8 kΩ Load 9.0 6.0 30 –10 dBm 20 –15 dBm –20 dBm 10 5.0 dBm 0 dBm 3.0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 0 1.0 –5.0 dBm 10 100 1000 f, FREQUENCY (MHz) VCC, SUPPLY VOLTAGE (V) Page 5 of 19 0 0 54 0 –20 RF INPUT (dBm) 60 RSSI OUTPUT ( µ A) TA = 75°C 60 RSSI OUT (µ A) THD, TOTAL HARMONIC DISTORTION (%) Figure 3. Total Harmonic Distortion versus Temperature www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. ML3371 PIN FUNCTION DESCRIPTION OPERATING CONDITIONS VCC = 4.0 Vdc, RFIn = 100 µV, fmod = 1.0 kHz, fdev = 3.0 kHz. ML3371 at f RF = 10.7 MHz (see Figure 11). Pin Symbol 1 OSC1 Internal Equivalent Circuit Description Waveform The base of the Colpitts oscillator. Use a high impedance and low capacitance probe or a “sniffer” to view the wave– form without altering the frequency. Typical level is 450 mVpp. VCC 1 15 k OSC1 2 2 OSC2 The emitter of the Colpitts oscillator. Typical signal level is 200 mVpp. Note that the signal is somewhat distorted compared to that on Pin 1. OSC2 200 µA 3 MXOut VCC 3 4 MixerOut Output of the Mixer. Riding on the 455 kHz is the RF carrier component. The typical level is approximately 60 mVpp. 15k 1.5 4 VCC Supply Voltage –2.0 to 9.0 Vdc is the operating range. VCC is decoupled to ground. 100 µA 5 IFIn 5 IFIn 1.8 k 6 53 k Input to the IF amplifier after passing through the 455 kHz ceramic filter. The signal is attenuated by the filter. The typical level is approximately 50 mVpp. DEC1 7 6 7 DEC1 DEC2 8 Quad Coil 51 k DEC2 60 µA 8 Quad Coil VCC IF Decoupling. External 0.1 µF capacitors connected to VCC. Quadrature Tuning Coil. Composite (not yet demodulated) 455 kHz IF signal is present. The typical level is 500 mVpp. 10 50 µA Page 6 of 19 www.lansdale.com Issue A ML3371, ML3372 Page 7 of 19 LANSDALE Semiconductor, Inc. www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. ML3371 PIN FUNCTION DESCRIPTION (continued) OPERATING CONDITIONS VCC = 4.0 Vdc, RFIn = 100 µV, fmod = 1.0 kHz, fdev = 3.0 kHz. ML3371 at f RF = 10.7 MHz (see Figure 11). Pin Symbol 13 RSSI Internal Equivalent Circuit VCC 1.8 k Bias Description Waveform RSSI Output. Referred to as the Received Signal Strength Indicator or RSSI. The chip sources up to 60 µA over the linear 60 dB range. This pin may be used many ways, such as: AGC, meter drive and carrier triggered squelch circuit. 13 RSSIOut 14 MUTE 14 Mute or SqOut Mute Output. See discussion in application text. 40 k 15 Gnd Gnd 16 MIXIn Ground. The ground area should be continuous and unbroken. In a two– sided layout, the component side has the ground plane. In a one–sided layout, the ground plane fills around the traces on the circuit side of the board and is not interrupted. 15 VCC 16 Mixer Input – Series Input Impedance: @ 10 MHz: 309 – j33 Ω @ 45 MHz: 200 – j13 Ω MixerIn 3.3 k 10 k *Other pins are the same as pins in MC3371. Page 8 of 19 www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. ML3372 PIN FUNCTION DESCRIPTION OPERATING CONDITIONS VCC = 4.0 Vdc, RFIn = 100 µV, fmod = 1.0 kHz, fdev = 3.0 kHz. ML3372 at f RF = 45 MHz (see Figure 13). Pin Symbol 5 IFIn Internal Equivalent Circuit Description Waveform IF Amplifier Input 5 IFIn 53 k 6 6 DEC1 DEC 60 µA 7 IFOut VCC IF Decoupling. External 0.1 µF capacitors connected to VCC. IF Amplifier Output Signal level is typically 300 mVpp. 7 IFOut 50 µA 120 µA 8 QuadIn Quadrature Detector Input. Signal level is typically 150 mVpp. 8 QuadIn VCC 10 9 50 µA RA Recovered Audio. This is a composite FM demodulated output having signal and carrier components. Typical level is 800 mVpp. VCC 200 9 100 µA Page 9 of 19 RAOut The filtered recovered audio has the carrier signal removed and is typically 500 mVpp. www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. Figure 9. ML3371 Circuit Schematic MixerOut 3 MixerIn 16 4 VCC Meter Out 13 FilterIn 10 12 Squelch In 1 11 FilterOut OSC1 2 X X Y OSC2 100 µA Bias 8 4 10 5 DEC1 Squelch Out 15 Gnd VCC 1.8 k 6 14 Bias 200 µA IFIn – + QuadIn X Y X Y 200 9 RAOut 53 k 51 k 7 DEC2 100 µA Figure 10. ML3372 Circuit Schematic MixerIn 16 4 VCC MixerOut 3 Meter Out 13 FilterIn 10 12 Squelch In 1 11 FilterOut OSC1 2 X X Y OSC2 100 µA Bias 8 4 QuadIn 10 5 IFIn IFOut Squelch Out 15 Gnd VCC 6 14 Bias 200 µA DEC – + X Y X Y 200 9 RAOut 53 k 7 100 µA Page 10 of 19 www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. CIRCUIT DESCRIPTION The ML3371 and ML3372 are low power narrowband FM receivers with an operating frequency of up to 60 MHz. Its low voltage design provides low power drain, excellent sensitivity, and good image rejection in narrowband voice and data link applications. This part combines a mixer, an IF (intermediate frequency) limiter with a logarithmic response signal strength indicator, a quadrature detector, an active filter and a squelch trigger circuit. In a typical application, the mixer amplifier converts an RF input signal to a 455 kHz IF signal. Passing through an external bandpass filter, the IF signal is fed into a limiting amplifier and detection circuit where the audio signal is recovered. A conventional quadrature detector is used. The absence of an input signal is indicated by the presence of noise above the desired audio frequencies. This “noise band” is monitored by an active filter and a detector. A squelch switch is used to mute the audio when noise or a tone is present. The input signal level is monitored by a meter drive circuit which detects the amount of IF signal in the limiting amplifier. LEGACY APPLICATIONS INFORMATION The oscillator is an internally biased Colpitts type with the collector, base, and emitter connections at Pins 4, 1 and 2 respectively. This oscillator can be run under crystal control. For fundamental mode crystals use crystal characterized parallel resonant for 32 pF load. For higher frequencies, use 3rd overtone series mode type crystals. The coil (L2) and resistor RD (R13) are needed to ensure proper and stable operation at the LO frequency (see Figure 13, 45 MHz application circuit). The mixer is doubly balanced to reduce spurious radiation. Conversion gain stated in the AC Electrical Characteristic stable is typically 20 dB. This power gain measurement was made under stable conditions using a 50 Ω source at the input and an external load provided by a 455 kHz ceramic filter at the mixer output which is connected to the VCC (Pin 4) and IF input (Pin 5). The filter impedance closely matches the1.8 kΩ internal load resistance at Pin 3 (mixer output). Since the input impedance at Pin 16 is strongly influenced by a 3.3 kΩ internal biasing resistor and has a low capacitance, the useful gain is actually much higher than shown by the standard power gain measurement. The Smith Chart plot in Figure 17 shows the measured mixer input impedance versus input frequency with the mixer input matched to a 50Ω source impedance at the given frequencies. In order to assure stable operation under matched conditions, it is necessary to provide a shunt resistor to ground. Figures 11, 12 and 13 show the input networks used to derive the mixer input impedance data. Following the mixer, a ceramic bandpass filter is recommended for IF filtering (i.e. 455 kHz types having a bandwidth of ±2.0 kHz to ±15 kHz with an input and output impedance from 1.5 kΩ to 2.0 kΩ). The 6 stage limiting IF amplifier has approximately 92 dB of gain. The MC3371 and MC3372 are Page 11 of 19 different in the limiter and quadrature detector circuits. The MC3371 has a 1.8 kΩ and a 51 kΩ resistor providing internal dc biasing and the output of the limiter is internally connected, both directly and through a 10 pF capacitor to the quadrature detector; whereas, in the MC3372 these components are not provided internally. Thus, in the MC3371, no external components are necessary to match the 455 kHz ceramic filter, while in the MC3372, external 1.8 kΩ and 51 kΩ biasing resistors are needed between Pins 5 and 7, respectively (see Figures 12 and 13). In the MC3371, a parallel LCR quadrature tank circuit is connected externally from Pin 8 to VCC (similar to the MC3361). In the MC3372, a quadrature capacitor is needed externally from Pin 7 to Pin 8 and a parallel LC or a ceramic discriminator with a damping resistor is also needed from Pin 8 to VCC (similar to the MC3357). The above external quadrature circuitry provides 90° phase shift at the IF center frequency and enables recovered audio. The damping resistor determines the peak separation of the detector and is somewhat critical. As the resistor is decreased, the separation and the bandwidth is increased but the recovered audio is decreased. Receiver sensitivity is dependent on the value of this resistor and the bandwidth ofthe 455 kHz ceramic filter. On the chip the composite recovered audio, consisting of carrier component and modulating signal, is passed through a low pass filter amplifier to reduce the carrier component and then is fed to Pin 9 which has an output impedance of 450Ω. The signal still requires further filtering to eliminate the carrier component, deemphasis, volume control, and further amplification before driving a loudspeaker. The relative level of the composite recovered audio signal at Pin 9 should be considered for proper interaction with an audio post amplifier and a given load element. The MC13060 is recommended as a low power audio amplifier. The meter output indicates the strength of the IF level and the output current is proportional to the logarithm of the IF input signal amplitude. A maximum source current of 60 µA is available and can be used to drive a meter and to detect a carrier presence. This is referred to as a Received Strength Signal Indicator (RSSI). The output at Pin 13 provides a current source. Thus, a resistor to ground yields a voltage proportional to the input carrier signal level. The value of this resistor is estimated by (VCC(Vdc) – 1.0 V)/60 µA; so for VCC = 4.0 Vdc, the resistor is approximately 50 kΩ and provides a maximum voltage swing of about 3.0 V. A simple inverting op amp has an output at Pin 11 and the inverting input at Pin 10. The noninverting input is connected to 2.5 V. The op amp may be used as a noise triggered squelch or as an active noise filter. The bandpass filter is designed with external impedance elements to discriminate between frequencies. With an external AM detector, the filtered audio signal is checked for a tone signal or for the presence of noise above the normal audio band. This information is applied to Pin 12. www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. Legacy Applications Information An external positive bias to Pin 12 sets up the squelch trigger circuit such that the audio mute (Pin 14) is open or connected to ground. If Pin 12 is pulled down to 0.9 V or below by the noise or tone detector, Pin 14 is internally shorted to ground. There is about 57 mV of hyteresis at Pin 12 to prevent jitter. Audio muting is accomplished by connecting Pin 14 to the appropriate point in the audio path between Pin 9 and an audio amplifier. The voltage at Pin 14 should not be lower than –0.7 V; this can be assured by connecting Pin 14 to the point that has no DC component. Another possible application of the squelch switch may be as a carrier level triggered squelch circuit, similar to the MC3362/MC3363 FM receivers. In this case the meter output can be used directly to trigger the squelch switch when the RF input at the input frequency falls below the desired level. The level at which this occurs is determined by the resistor placed between the meter drive output (Pin 13) and ground (Pin 15). Figure 11b shows a typical application using the ML145170/ML145170 PLL device to obtain multiple channel operation. Figure 11a. Typical Application for ML3371 at 10.7 MHz V CC = 4.0 Vdc + RSSI Output R2 10 k 1st IF 10.7 MHz from Input Front End C9 10 R3 100 k C15 91 8.2 µH L2 + C2 4.7 µF L1 TKANS9443HM 6.8 µH ±6% R11 560 R1 51 k C1 0.01 R4 1.0 k D1 1N5817 R5 VR1 (Squelch Control) 10 k 4.7 k R6 C3 0.1 C17 0.1 C4 0.001 C5 0.001 R9 560 R8 R7 3.3 k C7 0.022 4.7 k VR2 10 k 510 k 16 15 14 13 12 11 Squelch Trigger with Hysteresis Mixer 1 Oscillator 2 3 9 10 AF Filter – Amp Amp + Demodulator Limiter Amp 4 5 1.8 k 6 51 k 10 53 k 7 8 C8 0.22 AF Out to Audio Power Amp C10 10.245 MHz 68 C12 0.1 C11 220 C13 0.1 muRata CFU455D2 or equivalent Page 12 of 19 www.lansdale.com R10 39 k T2: Toko 2A6597 HK (10 mm) or 7MC–8128Z (7 mm) C14 0.1 Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. Figure 11b. Typical Application using PLL ML145170 Device Allowing Multiple Channel Operation. R SSI V2 5V +V C2 1nF ML3371 L3 1uH C10 1nF D2 MV209 xtal xtalP1 P2 mixoutP3 vcc P4 liminP5 decP6 decP7 quadP8 C3 47pF L1 1uH C23 C21 1uF .1uF C14 R13 .001uF 4.7k R14 510k .001uF C22 P16 mixin P15 gnd P14 mute P13 rssi P12 sqin P11 filout P10 filin P9 recaudio 51k R3 P1 R5 100k D1 1N914 C 11 .1uF C1 15pF R15 1k C4 33pF 33pF 10k R10 C8 C5 C20 .1uF R8 10k R12 3.3kk R9 3.3k C12 .22uF Volume C13 R2 10k 40% U1 1uH L2 C7 .1uF .1uF R1 20k C6 150pF V1 10V +V U2 C9 .1uF 455 Khz ceramic filter P16 Vdd phsV P15 phsR P14 P13 PDout P12 Vss P11 LD P10 Fv P9 Fr C19 .1uF U3 oscinP1 oscout P2 REFoutP3 FinP4 DinP5 enbP6 clkP7 DoutP8 MC145170 C18 1nF R7 2.7k R4 10k 40% .022uF cerfil V3 5V C15 +V .1uF Squelch R11 4.7k SPI J2 XTAL2 1.000MHZ 1Meg R6 C17 27pF Page 13 of 19 C16 27pF www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. Legacy Applications Information Figure 12. Typical Application for ML3372 at 10.7 MHz VCC = 4.0 Vdc + RSSI Output R2 10 k 1st IF 10.7 MHz from Input Front End C9 10 8.2 µH L2 + C2 4.7 µF C16 91 L1 TKANS9443HM 6.8 µH ± 6% R13 560 R1 51 k C1 0.01 R4 1.0 k D1 1N5817 R5 VR1 (Squelch Control) 10 k 4.7 k R6 C3 0.1 C6 0.1 560 C4 0.001 R8 R7 3.3 k C7 0.022 4.7 k C5 0.001 C8 0.22 R9 16 15 14 13 510 k 10 11 – Filter Amp + 12 Squelch Trigger with Hysteresis Oscillator 2 3 Limiter Amp 4 C10 10.245 MHz 68 5 6 R10 1.8k C2 220 C12 0.1 10 53 k 7 C13 0.1 R11 51 k muRata CFU455D2 or equivalent Page 13 of 19 9 AF Amp AF Out to Audio Power Amp Demodulator Mixer 1 VR2 10 k www.lansdale.com 8 C14 27p R12 4.3 k muRata CDB455C16 C15 0.1 Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. Legacy Applications Information Figure 13. Typical Application for ML3372 at 45 MHz RSSI Output to Meter (Triplett – 100 kV) VCC = 4.0 Vdc + C9 10 R3 100 k RF Input 45 MHz C17 120 + C2 4.7 C18 75 R2 12 k L1 0.245 µH Coilcraft 150–07J08 D1 C3 0.1 16 C5 0.001 15 14 13 12 Oscillator 2 3 4 5 6 C10 44.545 MHz 560 R7 R10 1.8 k C11 5.0 30 L2 0.84 µH C12 0.1 7 R11 51 k R12 4.3 k R13 1.0 k muRata CDB455C16 Figure 15. RSSI Output versus RF Input 3.0 RSSI OUTPUT (Vdc) 3.0 2.5 2.0 fRF = 10.7 MHz VCC = 4.0 Vdc Reference Figure 11 1.0 AF Out to Audio Power Amp C15 0.1 3.5 1.5 VR2 10 k C14 27 Figure 14. RSSI Output versus RF Input RSSI OUTPUT (Vdc) C8 0.22 C7 0.022 C13 0.1 3.5 0.5 Page 14 of 19 3.3 k 8 muRata CFU455D2 or equivalent 0 –120 R8 4.7 k R9 Mixer 1 VR1 (Squelch Control) 10 k 510 k 11 10 9 – AF Filter Amp Amp + Demodulator 10 Limiter Amp 53 k Squelch Trigger with Hysteresis Coilcraft 143–13J12 C4 0.001 R1 470 C1 0.01 C16 0.01 1N5817 R5 4.7 k R6 C6 0.1 R14 51 k R4 1.0 k 2.5 2.0 1.5 fRF = 45 MHz VCC = 4.0 Vdc Reference Figure 13 1.0 0.5 –100 –80 –60 –40 –20 0 –120 www.lansdale.com –100 –80 –60 RF INPUT (dBm) –40 –20 Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. Legacy Applications Information Figure 16. S + N, N, AMR versus Input 10 S+N S + N, N, AMR (dB) 0 –10 fRF = 10.7 MHz VCC = 4.0 V TA = 25°C –20 –30 S + N 30% AM –40 –50 N –60 –130 –110 –90 –70 –50 –30 –10 RF INPUT (dBm) * Reference Figures 11, 12 and 13 Figure 17. Mixer Input Impedance versus Frequency +j50 +j25 +j100 +j150 +j10 VCC = 4.0 Vdc RF Input = –40 dBm +j250 +j500 0 10 25 50 100 150 250 500 45 MHz 10.7 MHz –j500 –j250 –j10 –j150 –j100 –j25 –j50 Page 15 of 19 www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. Legacy Applications Information Figure 18. MC3371 PC Board Component View with Matched Input at 10.7 MHz COMPONENT SIDE VCC GND CUT .325 C9 J3 C14 CFU VCC 455D 2 C13 C12 R10 J2 C10 BNC MC3371 IF 10.7 MHZ FRONT END MC3371 VR2 R8 CUT .325 GND C11 T2 AF OUT + XTAL 10.245 MHZ J1 C16 C15 INPUT IF 10.7 MHZ C1 C2 C R9 C3 C8 R7 5 C7 C4 D1 R6 R5 VR1 R3 R2 J3 L2 + R11 L1 J4 CUT .325 R4 R1 C17 BNC METER OUT VCC Figure 19. MC3371 PC Board Circuit or Solder Side as Viewed through Component Side SOLDER SIDE Above PC Board is laid out for the circuit in Figure 11. Page 16 of 19 www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. Legacy Applications Information Figure 20. MC3372P PC Board Component View with Matched Input at 10.7 MHz COMPONENT SIDE VCC GND CUT .325 C9 BNC GND R10 VCC C11 CFU455D2 C INPUT IF C10 XTAL 1 CDB 10.7 MHZ 10.245 3 455 MHZ C16 J1 C17 C14 R12 J2 MC3372 C16 VR2 C1 R8 R9 BNC C2 L2 C + C3 C8 L1 5 R13 C7 R7 C4 J4 CUT D1 R6 .325 R5 R4 C6 R1 METER VR1 R3 OUT R2 J3 C15 AF OUT + CUT .325 R 1 1 C12 MC3372 IF 10.7 MHZ FRONT END J3 VCC Figure 21. MC3372P PC Board Circuit or Solder Side as Viewed through Component Side SOLDER SIDE Above PC Board is laid out for the circuit in Figure 12. Page 17 of 19 www.lansdale.com Issue A ML3371, ML3372 LANSDALE Semiconductor, Inc. OUTLINE DIMENSIONS P DIP 16 = EP PLASTIC PACKAGE (ML3371EP, ML3372EP) CASE 648–08 ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. –A– 16 9 1 8 B F C L S SEATING PLANE –T– K H G D M J 16 PL 0.25 (0.010) M T A M 16 9 1 8 –B– P 8 PL 0.25 (0.010) M B R K S F X 45 C SEATING PLANE M 16 PL 0.25 (0.010) MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0 10 0.51 1.01 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. G D INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0 10 0.020 0.040 SO 16 = -5P PLASTIC PACKAGE (ML3371-5P, ML3372-5P) CASE 751B–05 (SO–16) ISSUE J –A– –T– DIM A B C D F G H J K L M S M T B S A S J DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0 7 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0 7 0.229 0.244 0.010 0.019 Lansdale Semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Lansdale does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. “Typical” parameters which may be provided in Lansdale data sheets and/or specifications can vary in different applications, and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by the customer’s technical experts. Lansdale Semiconductor is a registered trademark of Lansdale Semiconductor, Inc. Page 19 of 19 www.lansdale.com Issue A