MAB84X1 SINGLE-CHIP 8-BIT MICROCONTROLLER
The family of microcontrollers is fabricated in NMOS. The family consists of 5 devices:
O MAB8401 - 128 bytes RAM, external program memory, with 8-bit LED-driver (10mA),
emulation of MAB/F8422/42* possible
0 MAB/MAF8421 - 2K bytes ROM/64 bytes RAM plus 8-bit LED-driver
0 MAB/MAF8441 - 4l< bytes ROM/128 bytes RAM plus 8-bit LED-driver
0 MAB/MAF8461 - 6K bytes ROM/128 bytes RAM plus 8-bit LED-driver
Each version has 20 quasi-bidirectional l/O port lines, one serial l/O line, one single-level vectored
interrupt, an 8-bit timer/event counter and on-board clock oscillator and clock circuits. Two 20-pin
versions, MAB/F8422 and MAB/F8442* are also available.
This microcontroller family is designed to be an efficient controller as well as an arithmetic processor.
The instruction set is based on that of the MAB8048. The microcontrollers have extensive bit handling
abilities and facilities for both binary and BCD arithmetic.
For detailed information see the 84XX family specification.
* See data sheet on MAB/F8422/42.
0 8-bit: CPU, ROM, RAM and I/O in a single 28-lead DIL package
0 2K, 4K or 6K ROM bytes plus a FlOM~less version
0 64 or 128 RAM bytes
O 20 quasi-bidirectional l/O port lines
0 Two testable inputs: one of which can be used to detect zero cross-over, the other is also the
external interrupt input
0 Single level vectored interrupts: external, timer/event counter, serial l/O
0 Serial I/O that can be used in single or multi-master systems (serial l/O data via an existing port line
and clock via a dedicated line)
0 8»bit programmable timer/event counter
0 Internal oscillator, generated with inductor, crystal, ceramic resonator or external source
0 Over 80 instructions (based on MAB8048) all of 1 or 2 cycles
0 Single 5 V power supply (i 10%)
0 Operating temperature ranges: O to + 70 0C MAB84X1 family
-40 to + 85 °C MAF84X1 family only
-40 to +110 UC MAF84AX1 family only
MAB8401 B: 28-lead 'Piggy-back’ package (with up to 28-pin EPROM on top).
MAB8401WP: 68-lead plastic leaded chip-carrier (PLCC) (SOT188).
MAB/MAF8421/41/61P: 28-lead DIL; plastic with internal heat spreader (SOT117).
MAF84A21/41/61P: 28~lead DIL; plastic with internal heat spreader (SOT117).
SAB3034 COMPUTER INTERFACE FOR TUNING AND CONTROL (CITAC)
The SAB3034 provides closed-loop digital tuning of TV receivers, with or without a.f.c., as required. lt
also controls up to 8 analogue functions, 4 general purpose I/O ports and 4 high-current outputs for
tuner band selection.
The IC is used in conjunction with a microcomputer from the MAB84OO family and is controlled via a two-wire, bidirectional I2 C bus.
Combined analogue and digital circuitry minimizes the number of additional interfacing components
Frequency measurement with resolution of 50 KHz
Selectable prescaler divisor of 64 or 256
32 V tuning voltage amplifier
4 high-current outputs for direct band selection
8 static digital to analogue converters (DACSI for control of analogue functions
Four general purpose input/output (l/O) ports
Tuning with control of speed and direction
Tuning with or without a.f.c.
Single-pin, 4 MHZ on-chip oscillator
I2 C bus slave transceiver
The SAB3034 is a monolithic computer interface which provides tuning and control functions and
operates in conjunction with a microcomputer via an I2 C bus.
This is performed using frequency-locked loop digital control. Data corresponding to the required tuner
frequency is stored in a 15-bit frequency buffer. The actual tuner frequency, divided by a factor of 256
(or by 64) by a prescaler, is applied via a gate to a 15-bit frequency counter. This input (FDIV) is
measured over a period controlled by a time reference counter and is compared with the contents of the frequency buffer. The result of the comparison is used to control the tuning voltage so that the tuner frequency equals the contents of the frequency buffer multiplied by 50 kHz within a programmable tuning window (TUW).
The system cycles over a period of 6,4 ms (or 2,56 ms), controlled by the time reference counter which is clocked by an on-chip 4 lVlHz reference oscillator. Regulation of the tuning voltage is performed by a charge pump frequency-locked loop system. The charge IT flowing into the tuning voltage amplifier is controlled by the tuning counter, 3-bit DAC and the charge pump circuit. The charge IT is linear with the frequency deviation Af in steps of 50
TDA2545A Quasi-split-sound circuit
GENERAL DESCRIPTION The TDA2545A is a monolithic integrated circuit for quasi-split-sound processing in television receivers. Features · 3-stage gain controlled i.f. amplifier · A.G.C. circuit · Reference amplifier and limiter amplifier for vision carrier (V.C.) processing · Linear multiplier for quadrature demodulation.
TDA2541 IF AMPLIFIER WITH DEMODULATOR AND AFC
The TDA2540 and 2541 are IF amplifier and A.M.
demodulator circuits for colour and black and white
are intended for reception of negative or positive
modulation CCIR standard.
They incorporate the following functions : .Gain controlled amplifier .Synchronous demodulator .White spot inverter .Video preamplifier with noise protection .Switchable AFC .AGC with noise gating .Tuner AGC output (NPN tuner for 2540)-(PNP
tuner for 2541) .VCR switch for video output inhibition (VCR
TDA2006 12W AUDIO AMPLIFIER
The TDA2006 is a monolithic integrated circuit in
Pentawatt package, intended for use as a low
frequency class ”AB” amplifier. At ±12V, d = 10 %
typically it provides12Woutput poweron a 4W load
and 8W on a 8W . The TDA2006 provides high
output current and has very low harmonic and
cross-over distortion. Further the device incorporates
anoriginal (and patented)short circuit protection
system comprising an arrangement for
automatically limiting the dissipated power so as to
keep the working point of the output transistors
within their safe operating area. A conventional
thermal shutdown system is also included. The
TDA2006 is pin to pin equivalent to theTDA2030.
SHORT CIRCUIT PROTECTION
The TDA2006 has an original circuit which limits
the current of the output transistors.
This function can thereforebe considered as being
peak power limiting rather than simple current limiting.
It reduces the possibility that the device gets damaged
during an accidental short circuit from AC
output to ground.
The presence of a thermal limiting circuit offers the
following advantages :
1) an overload on the output (even if it is
permanent), or an above l imi t ambient
temperature can be easily supported since the
Tj cannot be higher than 150°C.
2) the heatsink can have a smaller factor of safety
compared with that of a conventional circuit.
There is no possibility of device damage due to
high junction temperature.
If for any reason, the junction temperature increases
up to 150 °C, the thermal shutdown simply
reduces the power dissipation and the current consumption.
The maximum allowable power dissipation depends
upon the size of the external heatsink (i.e.
its thermal resistance)