Dual Conversion AM Receiver 1 Overview 1.1 Features • • • • • • • • • • • • • TDA 4360X High flexibility with an external preamplifier stage Sym. or asym. mixer input 2-pin oscillator for the 1. LO 1. LO with LC tank circuit 1. LO at 100 MHz range P-DSO-28-1 Low narrow band noise Divider for 1. LO by 10 for the 100 kHz … 2 MHz range and by 8 for the 2 MHz … 6 MHz range Integrated AGC generation Strictly symmetrical RF path Decoupled counter output 2. LO with quartz or external source Output for gain controlled 2. IF Switchable AGC time constant Type Ordering Code Package TDA 4360X Q67000-A5181 P-DSO-28-1 1.2 Application The TDA 4360X is an integrated dual conversion AM receiver for use in car radios. The input signal passes a linear mixer for conversion into the 1. IF (~ 10 MHz). Via an external bandpass filter (CER filter, quartz filter) the 1. IF is converted in a second linear mixer to the 2. IF (~ 460 kHz). After an external narrowband selectivity (CER filter) the 2. IF passes an automatic gain controlled (AGC) amplifier and is then demodulated to the AF. The AGC time constant can be switched with a ratio of 20. For counter controlled search tuning stop (STS) the frequencies of the 1. LO and the 2. IF are available. Semiconductor Group 1 04.96 TDA 4360X 1.3 Pin Configuration (top view) P-DSO-28-1 Figure 1 Semiconductor Group 2 04.96 TDA 4360X 1.4 Pin Definitions and Functions Pin No. Function 1, 2 3 Sym. Input for the AM signal in the frequency range of 100 kHz (SW) to 6.2 MHz (49m-Band) sym. application is recommended, asym. application is possible DC voltage alters the threshold voltage of the prestage AGC circuit. 4 GROUND: All DC values are referred to this pin 5 Buffered output for the by n divided (n = 8 or 10) oscillator frequency 6 Output for the internal reference voltage. This pin is to be blocked with a ceramic capacitor to ground. The ext. LC circuit between pin 7 and pin 8 determines the oscillator frequency. Supply voltage. This point is to be blocked to ground for AF and for RF signals. 7, 8 9 10 Buffered output for the oscillator frequency 11 Input for the frequency divider. Low voltage to pin 11 divides the oscillator frequency by 8, high voltage or open input divides by10. 12 Blocking capacitor for the IF AGC circuit to suppress AF frequencies 13 Input to select the fast or slow AGC time constant 14 Buffered AF output Buffered output for the limited lower IF frequency. This signal is necessary for an IF Counter Tuning System. Buffered output for the AGC controlled lower IF signal. This pin is connected 16 to the AM stereo decoder. 17, 18, 19 Input pins for the DC coupled AGC amplifier 15 20 Open collector output of mixer for the lower IF (~ 450 MHz). A DC connection to the tank circuit to Vref is recommended. 21, 22 Sym. mixer 2 input for the upper IF (~ 10.7 MHz). Asym. operation is possible. The input signal is converted to the lower IF corresponding the equation fLIF = fUIF – f2.LO. Input for the 2. local oscillator (LO). The pins can be connected via a quartz or the oscillator is to be forced with an ext. signal. Blocking capacitor for the prestage AGC 23, 24 25 26 27, 28 A capacitor to ground determines the AGC time constant. The DC potential at this pin can be used for controlling the FET in the ext. prestage. Sym. collector output of the mixer 1. The external tank circuit is tuned to the upper IF. Semiconductor Group 3 04.96 TDA 4360X 1.5 Functional Block Diagram Figure 2 Block Diagram Semiconductor Group 4 04.96 TDA 4360X 2 Circuit Description The integrated circuit includes an 2-pin oscillator (1. LO) with sym. input, buffered output and a double balanced mixer with sym. input. These stages convert the AM input signal to a 1. IF which is much higher (~ 10 MHz) than the input frequencies. The 1. LO operates as a LC varactor oscillator in the same 100 MHz range like the FM tuner oscillator (e.g. TUA 4310X). So the same peripheral elements can be used. Depending on the signal strength the prestage AGC controls MOSFET prestage amplifiers. The 1. IF passes an external selectivity and is then converted in a sym. double balanced mixer to the 2. IF. The 2. LO operates as a quartz controlled oscillator or as an amplifier for an external signal. The 2. IF signal passes an automatic gain controlled (AGC) IF amplifier and is then demodulated to the AF in a quasi-synchronous demodulator. The AGC time constant can be switched with a ratio of 20. For fine tuning the decoupled 2. IF frequency is available. The TDA 4360X is prepared to work with a PLL in the 100 MHz range. When applied with a standard AM-PLL the oscillator frequency divided by 8 or 10 has to be used. In this case a higher phase noise is to be expected. Semiconductor Group 5 04.96 TDA 4360X 3 Electrical Characteristics 3.1 Absolute Maximum Ratings TA = – 40 °C to 85 °C Parameter ESD Supply voltage Mixer 1 output Mixer 2 output Mixer 2 input AGC threshold Mixer 1 input fOSC/n fOSC Divide by n VRef IRef 2. LO AGC amplifier input IF counter AM stereo output AF output IF AGC Symbol VESD VS V27, V28 V20 V21, 22 V3 V1, 2 V5 V10 V11 V6 I6, 0 V23, 24 V17 … 19 V15 V16 V14 V12 Limit Values Unit Remarks HBM min. max. –4 +4 kV 0 13.2 V 0 13.2 V 0 13.2 V 0 13.2 V V 0 5 V 0 5 V 0 13 V 0 13 V 0 5 V 0 5 V 0 3 mA 0 5 V 0 5 V 0 13.2 V 0 13.2 V 0 13.2 V 0 13.2 V 1.5 kΩ, 100 pF Note: Maximum ratings are absolute ratings; exceeding only one of these values may cause irreversible damage to the integrated circuit. Semiconductor Group 6 04.96 TDA 4360X 3.2 Operating Range Parameter Symbol Limit Values VS TA Supply voltage Ambient temperature Unit min. max. 7.5 13.2 V – 40 + 85 °C Note: In the operating range the functions given in the circuit description are fulfilled. 3.3 AC/DC Characteristics VS = 10 V, TA = + 25 °C, fIF1 = 10.7 MHz, fIF2 = 456 kHz, fi = 1MHz Parameter Symbol Limit Values min. IS typ. Unit Test Condition max. 55 mA Intercept point 3. order 110 dBµV Vi ≥ 100 mVrms Mixer gain 5 dB Vin = 10 mV, Current consumption Test Circuit Mixer 1 1.8 kΩ load Max. input voltage Vi 600 mVpp Noise figure (10 MHz) F 10 dB 140 MHz 1. LO Frequency range f1.LO Counter output VC Semiconductor Group 100 100 mVpp 7 04.96 TDA 4360X 3.3 AC/DC Characteristics (cont’d) VS = 10 V, TA = + 25 °C, fIF1 = 10.7 MHz, fIF2 = 456 kHz, fi = 1MHz Parameter Symbol Limit Values min. Divided counter output typ. Output impedance 2.4 RC Test Circuit mVpp 0.7 Divide by 10 Test Condition max. 100 Divide by 8 Unit V V 330 Ω 3 dB Mixer 2 Mixer gain Vin = 10 mV, 1.5 kΩ load Noise figure F 10 dB 2. LO Frequency range f2.LO 15 MHz External force voltage 30 mVrms Prestage AGC Output AGC voltage VAGC1 5.8 7.2 V AGC voltage VAGC1 0 0.5 V VDC = 2 V; Vi = 100 mVrms VDC = 4 V; Vi = 100 mVrms AGC Amplifier AGC range AGC voltage Reg. output voltage Input sensitivity 66 VAGC2 VIF V– 3dB Semiconductor Group 2.0 dB 4.8 V 1 V18 = 0/100 mVrms 1 30 mVrms 1 50 µVrms 1 8 04.96 TDA 4360X 3.3 AC/DC Characteristics (cont’d) VS = 10 V, TA = + 25 °C, fIF1 = 10.7 MHz, fIF2 = 456 kHz, fi = 1MHz Parameter Symbol Limit Values min. typ. Unit Test Condition Test Circuit V18 = 10 mVrms, V13 ≥ 2.4 V V18 = 10 mVrms, V13 ≤ 0.7 V 1 max. AGC current IAGC – 500 µA AGC current IAGC – 25 µA AF output voltage VAudio 180 mVrms Vi = 10 mV, m = 0.3 1 AF output voltage VAudio 480 mVrms Vi = 10 mV, m = 0.8 1 Total harm. distortion k 1 % Input voltage for S + N/N = 6 dB Vi 10 µVrms m = 0.3 1 Input voltage for Vi S + N/N = 26 dB 60 µVrms m = 0.3 1 S + N/N 60 dB Vi = 10 mV, m = 0.8 1 dB 100 µV/100 mV 1 Demodulator AF linearity ∆VAudio 3 Vi = 10 mV, m = 0.8 1 1 IF Counter IF counter output VC voltage 100 mVrms 1 Note: The listed characteristics are ensured over the operating range of the integrated circuit. Typical characteristics specify mean values expected over the production spread. If not otherwise specified, typical characteristics apply at TA = 25 °C and the given supply voltage. Semiconductor Group 9 04.96 TDA 4360X Figure 3 Test Circuit Semiconductor Group 10 04.96 TDA 4360X Figure 4 Application Circuit Semiconductor Group 11 04.96 TDA 4360X 4 Package Outlines GPS05123 P-DSO-28-1 (Plastic Dual Small Outline Package) Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book “Package Information”. SMD = Surface Mounted Device Semiconductor Group 12 Dimensions in mm 04.96