TDA4320X

FM-IF with Counter Output, Field Strength Indicator, Noise Detector and MUTE Setting TDA 4320X 1 1.1 Overview Features 7-stage limiter amplifier Coincidence demodulator Counter output with request input Field strength output Multipath identification circuit Adjustable muting depth (with full muting ≥ 80 dB) This device is ESD protected Ordering Code Q67000-A-5000 P-DSO-16-1 Type TDA 4320X Package P-DSO-16-1 Semiconductor Group 35 04.96 TDA 4320X 1.2 Pin Configuration (top view) P-DSO-16-1 Figure 1 1.3 1 Pin Definitions and Functions Function Ground Decoupling capacitors for bias, VS and VREF Pins are to be connected directly to Pin 1 GND Pin No. Symbol 2 Multipath Multipath identification input identification input High impedance input (Ri ~ 10 kΩ). This input receives the filtered field strength output (high pass or band pass). Rectifier time constant Multipath identification output MUTE input Rectifier time constant Determines the attack and release time of the identification circuit. Multipath identification output Open npn-collector output, which is low during (V4/V1 ≤ 0.7 V) multipath interference. MUTE input For DC voltage (usually derived from field strength output voltage) which attenuates the AF output voltage by the setting muting depth (Pin 7). Max. attenuation when V5 = 0 V, no attenuation when V5 ≥ 0.5 V. AF output Demodulated FM-IF. 36 04.96 3 4 5 6 AF output Semiconductor Group TDA 4320X 1.3 7 Pin Definitions and Functi...