CXA1484M

The CXA1484M is a low current consumption FM IF amplifiers which employ the newest bipolar process. It is suitable for double conversion pagers for overseas through built-in second mixer.

Features of the CXA1484M are:(1)low current consumption  1.4mA (typ. at Vcc=1.5V);(2)built-in second mixer oscillator;(3)low voltage operation   Vcc=1.0 to 4.0V;(4)few external parts for needless of IF decoupling capacitor;(5)built-in  reference  power  supply  for  operational amplifier and comparator;(6)small package 20-pin VSOP.In order to hasten the rising time from when power is turned on or when reception standby, the CXA1484M features a quick charge circuit.Therefore, the quick charge circuit eliminates the need to insert capacitor between the detector output and the LPF as is the case with conventional ICs, but connects capacitor to Pin 6 to determine the average signal level during steady-state reception.

The absolute maximum ratings of the CXA1484M can be summarized as:(1)supply voltage:12.0V;(2)operating temperature:-20 to +75°C;(3)storage temperature:-65 to +150°C.COMP is the NRZ comparator. Coupling on conventional system is performed by placing a capacitor between the detector buffer and the LPF operational amplifier, matching of DC is not performed .Thus, this matching capacitor must be charged when restoring the system from reception standby mode to reception mode, within which time signals from the comparator appear at the NRZ output.To shorten this rise time, as shown in Fig.8 the CXA1484 adds feedback loop from the comparator input to the input circuit of output. This equalizes the average value of the comparator input voltage to the reference voltage, with the quick charge circuit of CHG being set inside the feedback loop. Switching the current of quick change circuit enables reduction of the rise time.

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