- STS086 FRONT KEYBOARD CONTROL AND DISPLAY.
- STB021 MAIN SUPPLY / DEFLECTION / SYNCH / EHT
- STD071 IF VIDEO
- STCC071 AUDIO IF DISCR
- STEE71 with TDA2840
- STEI71 WITH TBA120U AUDIO IF
- STY071E RGB AMPLIFIER
- STU073D REMOTE CONTROL UNIT DRIVING + 2ND PROGR MEMORY WITH SAA1251 +ER1400
- STM071C ST-BY SUPPLY
- STC075C WITH AY-3-8203A
AY3-8203
AY3-8203
Miscellaneous Digital Circuit - ECONOMEGA/16ch Digital Tuning System.
General Semiconductor, Inc.
Vsup(-) Nom.(V) Neg.Sup.Volt.=0
Vsup(+) Nom.(V) Pos.Sup.Volt.=12
Status=Discontinued
Package=N/A
Pins=N/A
Military=N
Technology=MOS.
FEATURES:
8/12/16 Programs
3/4 Bands
10 bit Coarse-Tune
4 bit Fine-Tune
Non-Volatile Memory without battery
Auto or Manual Tuning
Auto or Manual Band switching.
DESCRIPTION
The
ECONOMEGA Digital Tuning system is a three chip voltage synthesizer.
The first chip (AY-5-8203) is an n-channel control chip which interfaces
the remote control system, memory and D/A converter. The second chip
(ER1400) is a non-volatile EAROM memory which stores the tuning and band
information for 16 programs. The third chip is a CMOS Buffer
amplifier/switch. This amplifies the converter output from the control
chip to a fixed reference voltage and also contains the switch circuitry
for the fine time slot. For detailsor] the MEM4956 D/A converier
circuit and the ER1400 EAROM, refer to the separate data sheet in this
section.
NOTE: 10 bits of coarse time and 4bits of fine tune does not
mean the resolution is 14 bits (described later). The overall
resolution is: Band 3 - 11 bits Bands 1, 2, & 4 - 10 bits.
OPERATION
1. Coarse Tune
The coarse tune resolution is 10 bits with a predominant output ripple at 3.9kHz.
2. Fine Tune
The
fine tune resolution is 4 bits with an output ripple at 15.6kHz. The
fine tune steps twice per second related to system clock; it does not
wrap around or overflow into coarse tune. During scanning it is reset to
mid range.
3. Scanning
The actual tuning rates are fixed by the Tuning Clock and may be
adjusted over wide limits. Typical figures are shown below.
(a) Normal Mode
Operation of a band button initiates scanning on the
selected band, typical scan rates are as follows:
Band
Scan Time
1
0.8 sec.
2
1.6 sec.
3
8.0 sec.
4
1.6 sec.
(b) Constant Time Scan Mode
Operation of a band button initiates scanning on the selected band. The scan rate is a constant 8 seconds for each band.
(c) Auto Band Switching Mode
At the end of each scan the band is automatically changed in the sequence 1, 2, 3, 4. In the 3 band mode, band 4 is omitted.
4. Auto Stop and Validate
In
the Normal Mode a stop is executed immediately on a positive going
input transition. If validate goes positive within 256 msec the system
stops, if not the scan will restart (See Fig. 1 for a suggested validate
circuit). At the end ot' a band the tuning voltage goes back to zero
and after a delay of 256 msec scanning restarts. In the Constant Time
Scan mode in Band 3, the stop is executed on a negative going
transition.
5. Manual Operation
In the Normal Mode Stop and Validate can be linked to the Band Inputs to give full manual control of the tuning operation.
6. Muting
The
Muting output is active from the time that a Scan is initiated until
the Validate input goes positive after a Stop command. When a program
change is made the Muting output is activated. for 256 msec.
7. Tuning Procedure:
(a) 1. Select required program number (1 to 16).
2. Press required band button, scanning commences
from the station currently tuned, scanning stops at the
next station.
3. Fine tune if required.
4. Store Data.
(b) Alternatively using the circuitry shown in Fig. 2, the
following procedure is available:
1. Press Band or Start.
2. Press Store.
3. Press required program.
8. Fine Tune Resolution
When
the MEM4956 D/A is used to combine the Coarse and Fine Data the
relationship between Coarse Tune and Fine Tune is as follOWS:
Band 1
Band 2. 4
Band 3
1 FT step = 7.5 CT steps
1 FT step = 2.5 CT steps
1 FT step = 0.5 CT steps.
9. Additional Fine Tune Information
The
fine tune output is a rectangular waveform with a frequency of 15.6kHz
(system clock +128). The mark/space ratio defines the fine tune level.
16 steps being possible. The following diagram relates the binary number
within the fine tune store to the output waveform. Bit width is
approximately 3.8,Js for a 15.6kHz output waveform.
10. Additional Coarse Tune fnformatlon
The
Coarse tune output is a rectangular waveform with a predominant ripple
frequency of 3.9kHz (system clock +512). The mark/space ratio indicates
the coarse tune level. The addition of a coarse tune bit increases the
mark period by approx. 1.0pS for a 2.0MHz clock. There are thus 256 bits
within the 3.9kHz period. This accounts for8 of the 10 coarse tune
bits. The information from the remaining 2 bits (LS .Bits) is used to
add O. 1. 2. or 3 extra bit periods (1.0ps) over 4 periods of the basic
waveform. The complete coarse tune waveform repeats every 1 ms.
11. MEM 4956 Buller
This
buffer combines coarse and fine data under the control of the Fine Time
slot output from the control chip. The fine time slot controls the CMOS
switch and hence the times the coarse tune or fine tune information are
routed to the output filter. Note the fine tune waveform is filtered
before being routed to the switch.
+ UAA1008A + MC14011UB + ER1440
it's the famous Tuning memory from MOTOROLA in the 70's and was the most reliable and efficient VST Tuning System basically bugless and was quite sophisticated since was a mix of digital tech + analog tech.
MOTOROLA UAA1008A-DP TUNING MEMORY SYSTEM LINEAR PROCESSOR CIRCUIT
The
UAA1008A provides the interfacing between the digital section of the
tuning memory system and the TV set. In addition, it supplies the
necessary functions and stabilized voltages for operating the complete
system.
When used in conjunction with the MC14425f29 and MC14426 it will perform the following:
• D/A conversion of varicap voltage
• 34 Volt regulation
• 5 volt regulation for supply of all VOO external lines
• Supply voltage supervisory control
• BAND decoding and driver (35 mAl
• TV station capture control with help of fly·back, video, and AFC signals.
The power supply here is even unique.
It use instead of a switching transistor on primary side a switching THYRISTOR like RCA ITR17011 + another thyristor for phase regulator stage at 100HZ Freq. , stabilisation and protection features.
All functions are featured by a SALORA HYBRID ASIC LF0D151154 .
TDA2541 IF AMPLIFIER WITH DEMODULATOR AND AFC
DESCRIPTION
The TDA2540 and 2541 are IF amplifier and A.M.
demodulator circuits for colour and black and white
television receivers using PNP or NPN tuners. They
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
play back).
.SUPPLYVOLTAGE : 12V TYP
.SUPPLYCURRENT : 50mATYP
.I.F. INPUT VOLTAGE SENSITIVITY AT
F = 38.9MHz : 85mVRMS TYP
.VIDEO OUTPUT VOLTAGE (white at 10% of
top synchro) : 2.7VPP TYP
.I.F. VOLTAGE GAIN CONTROL RANGE :
64dB TYP .SIGNAL TO NOISE RATIO AT VI = 10mV :
58dB TYP
.A.F.C. OUTPUT VOLTAGE SWING FOR
Df = 100kHz : 10V TYP
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