M193 Datasheet | SGS

- It DS INTEGRATED CIRCUITS M 193 M 193A ELECTRONIC PROGRAM MEMORY - ONE CHIP SOLUTION INCLUDING CONTROL AND NON VOLATILE MEMORY FOR 16 PROGRAMS - 10YEARS MEMORY RETENTION - UNLIMITED NUMBERS OF READ CYCLES - AUTOMATIC AND MANUAL STATION SEARCH - EXTERNALLY ADJUSTABLE SEARCH SPEED - FINE TUNING IN 8 STEPS, STORABLE FOR EACH PROGRAM SEPARATELY - MUTE OUTPUT it 4.43 MHz QUARTZ or LC REFERENCE FREQUENCY The M 193 is a monol ith ic integrated circuit constructed in N-channel sil icon gate technology, designed to control digitally via a D/A converter, with a resolution of 8192 steps, a TV or Radio varicap tuner. It also contains a 17 bit x 16 words NVRAM, whose control timing is internally generated, and after having been externally buffered, is returned to the integrated circuit to drive the memory. Each memory word contains information for 1 program, i.e. band (2 bit), tuning voltage (12 bit) and fine tuning offset (3 bit). The circuit is able to operate either in automatic or manual search. The ,earch speed is externally con- trolled by a simple RC network. In the automatic mode the M193 works in conjunction with the TDA 4431, which provides TV station recognition and converts the AFC-S-curve into a digital - mand. This mand controls the 13 bit up/down counter in the M193, whose position determines the tuning voltage. A mute output is provided to avoid noise on the audio during automatic search, program change or when the supply voltage is switched on/off. The circuit accepts standard program selection on 4 bus lines. 7-segment program display is possible by using the M192 circuit connected at the same lines. A serial information output is provided to display on the screen, via the M191 integrated circuit, the varicap voltage in the form of a linear tuning bar and the band. The M193 is available in a 28 lead dual in-line plastic package. Two different types are available which differ as specified below. "'193 - Standard type. M193A - As M 193 but the fine tuning is...