NJM2294

The NJM2294 has the following features including Low Operating Voltage(1.1-4.OV);RSSI (Received Signal Strength Indicator);FSK wave shaper;Battery  check alarm function (Alarm Voltage=1.1 V typ.);Battery saving function;A high output current voltage regurator with an external transistor ( I.l V typ.);A ceramic discriminator Is avadable;Package Outline SSOP16;Bipolar Technology.

NJM2294 is a super low current FM IF IC for pagers. NJM2294 includes almost all functions of the pacing IF system. In those functions, the RSSI function can be used for automatic gain control. When the electric field SII'ength IS high, the RSSI output signal can control the attenuation of an RF amplifier to improve the received condition.When the demodulated FSK signal is weak or noisy, the micro computer may ftil to read data.The wave shaping circuit (comparator) will change those signals to the correct logical signal to prevent the readerror.The DC voltage of the FSK-REF terminal is equal to that of the demodulated FSK signal. When the battery saving state turns into the ordinary state, the FSK-REF terminal voltage will be late to come up to the reference voltage by the time constant of an external capacitor and an internal resistor,and the wave shaped data may be failed. This circuit will charge/discharge the external capacitor quickly to prevent the error.When the DC level of the FM demudulated voltage output changes in the operation mode of this function, the FSK-REF terminal follows to the FSK demodulated output DC voltage, and the FSK output duty ratio can be constant.

The NJM2294 described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for any use that includes fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for any use where chance of failure is intolerable (i.e., submersible repeater and artificial satellite).