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PDF TUA6012XS Data sheet ( Hoja de datos )
| Número de pieza | TUA6012XS | |
| Descripción | Components for Entertainment Electronics | |
| Fabricantes | Siemens Semiconductor Group | |
| Logotipo |  |
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Components
for Entertainment Electronics
2 Band TV Tuner
TUA 6012, TUA 6014
Mixer-Oscillator-PLL
Data Sheet 1998-09-01
1 page  
2 Band TV Tuner
Mixer-Oscillator-PLL
TUA 6012
TUA 6014
1 Overview
1.1 Features
General
• Suitable for NTSC and PAL tuners
• Full ESD protection
Mixer/Oscillator
• High impedance mixer input for VHF
• Low impedance mixer input for UHF
• 4 pin oscillator for VHF
• 4 pin oscillator for UHF
PLL
• PLL with short lock-in time;
no asynchronous divider stage
• High voltage VCO tuning output
• Fast I2C Bus
• 4 NPN bandswitch buffers
• Internal VHF/UHF switch
• Lock-in flag
• Power-down reset
• Programmable reference divider ratio (64, 80, 128)
• Programmable charge pump current
BIPOLAR
P-TSSOP-28-1
Type
TUA 6012XS
TUA 6014XS
TUA 6014-K
TUA 6014-S
Semiconductor Group
Ordering Code
Q67006-A5234-A701
Q67036-A1001-A701
Q67036-A1006-A702
Q67036-A1020-A701
5
Package
P-TSSOP-28-1
P-TSSOP-28-1
P-TSSOP-28-1
P-TSSOP-28-1
1998-09-01
5 Page 
TUA 6012
TUA 6014
2 Circuit Description
2.1 Mixer-Oscillator Block
The mixer oscillator section includes two balanced mixers (double balanced mixer), two
balanced oscillators for VHF low and/or VHF high band and UHF, a reference voltage
source and a band switch.
Filters between tuner input and IC separate the TV frequency signals into two bands.
The band switching in the tuner front-end is done by using two, three or four port outputs.
In the selected band the signal passes a tuner input stage with MOSFET amplifier, a
double-tuned bandpass filter and is then fed to the balanced mixer input of the IC which
has in case of VHF low/VHF high a high-impedance input and in case of UHF a low-
impedance input. The VHF low/VHF high input can be used unsymmetrically by
capacitively grounding one of the input pins. The input signal is mixed there with the
signal from the activated on chip oscillator to the IF frequency and is available at the
balanced high-impedance output pair (IFout/IFout).
2.2 PLL Block
The mixer-oscillator signal VCO/VCO is internally DC-coupled as a differential signal at
the programmable divider inputs. The signal subsequently passes through a
programmable divider with ratio N = 256 through 32767 and is then compared in a digital
frequency/phase detector to a reference frequency fref = 4 MHz / reference divider ratio
(fref = 31.25 kHz, 50 kHz or 62.5 kHz). This frequency is derived from a unbalanced, low-
impedance 4 MHz crystal oscillator (pin Q) divided by reference divider ratio
(programmable reference divider ratio = 128, 80 or 64).
The phase detector has two outputs, UP and DOWN that drive two current sources I+
and I- of a charge pump. If the negative edge of the divided VCO signal appears prior to
the negative edge of the reference signal, the I+ current source pulses for the duration
of the phase difference. In the reverse case the I- current source pulses. If the two
signals are in phase, the charge pump output (CHGPMP) goes into the high-impedance
state (PLL is locked). An active low-pass filter integrates the current pulses to generate
the tuning voltage for the VCO (internal amplifier, external pullup resistor at TUNE and
external RC circuitry). The charge pump output is also switched into the high-impedance
state when the control bit T0 = 1. Here it should be noted, however, that the tuning
voltage can alter over a long period in the high-impedance state as a result of self-
discharge in the peripheral circuity. TUNE may be switched off by the control bit OS to
allow external adjustments.
If the VCO is not working the PLL locks to a tuning voltage of 33 V.
By means of control bit 5I the pump current can be switched between two values by
software. This programmability permits alteration of the control response of the PLL in
the locked-in state. In this way different VCO gains can be compensated, for example.
Semiconductor Group
11
1998-09-01
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TUA6012XS.PDF ] | |
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