|
|
PDF TDA9829T Data sheet ( Hoja de datos )
| Número de pieza | TDA9829T | |
| Descripción | Downconverter for DVB | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de TDA9829T (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
INTEGRATED CIRCUITS
DATA SHEET
TDA9829T
Downconverter for DVB
Product specification
File under Integrated Circuits, IC02
1998 Nov 09
1 page  
Philips Semiconductors
Downconverter for DVB
Product specification
TDA9829T
FUNCTIONAL DESCRIPTION
Vision IF amplifier
The vision IF amplifier consists of three AC-coupled
differential amplifier stages. Each differential stage
comprises a feedback network controlled by emitter
degeneration to control the IF gain.
VCO, Travelling Wave Divider (TWD) and AFC
The VCO operates with a resonance circuit (with L and C
in parallel) at double the IF frequency plus symbol
frequency. The VCO is controlled by integrated variable
capacitors. The control voltage required to tune the VCO
from its free-running frequency to its actual frequency is
fed to the capacitors. This control voltage is amplified and
converted into a current which represents the AFC output
signal. At centre frequency the AFC output current is equal
to zero.
The oscillator signal is divided-by-two with a TWD which
generates a differential output signal for downconverting
the IF signal.
DVB mixer
The gain controlled DVB-IF signal is downconverted to the
symbol frequency by use of a four quadrant multiplier.
The conversion signal is provided by the VCO and TWD.
DVB AGC and tuner AGC
The AGC detector charges/discharges the AGC capacitor
to the required voltage for setting the IF and tuner gain in
order to keep the DVB signal at a constant level.
A peak detector is used for the DVB AGC. The peak value
of (digital) the QAM signal is detected and controlled to a
constant value by the variable gain IF amplifier.
The detector bandwidth is adapted to the symbol
frequency (3 to 11 MHz). The external AGC time constant
is given by the IF AGC capacitor at pin 18.
The AGC capacitor voltage is transferred to an internal IF
control signal, and is fed to the tuner AGC to generate the
tuner AGC output current (open-collector output).
The tuner AGC takeover point can be adjusted. This
allows the tuner and the SWIF filter to be matched to
achieve the optimum IF input level.
The DVB output signal (VoDVB) can be adjusted in a range
of ±3 dB by a control voltage (∆Vadj) at pin 9. The internal
AGC can be switched off at pin 6 and the IF gain can be
controlled by an external voltage at pin 8. The tuner AGC
is active in both instances.
DVB output amplifier
The output amplifier for the DVB signal has a high
bandwidth and delivers a 2 V (p-p) signal. The amplifier
can be switched to a mute state forced by the signal at
pin 20.
Internal voltage stabilizer
A band gap circuit internally generates a voltage of
approximately 1.25 V, independent of supply voltage and
temperature. A voltage regulator circuit, connected to this
voltage, produces a constant voltage of 3.6 V which is
used as an internal reference voltage.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
VP
Vn
tsc(max)
V12
Tstg
Tamb
Ves
PARAMETER
supply voltage (pin 19)
voltage at pins
1 to 10, 13, 14 and 18 to 20
maximum short-circuit time
tuner AGC output voltage
storage temperature
operating ambient temperature
electrostatic handling voltage
CONDITIONS
MIN.
maximum chip temperature of 125 °C 0
0
MAX. UNIT
5.5 V
VP V
machine model class B
−
0
−25
−20
−300
10
13.2
+150
+70
+300
s
V
°C
°C
V
1998 Nov 09
5
5 Page 
Philips Semiconductors
Downconverter for DVB
Product specification
TDA9829T
89
handbook, full pagewidth
fVCO
(MHz)
88
MHA662
87
86
85
84
83
01 234
L1 = 248 nH and C1 = 5.6 pF.
Fig.7 VCO control characteristic for DVB (Europe).
V10 (V)
5
1998 Nov 09
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TDA9829T.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| TDA9829T | Downconverter for DVB | NXP Semiconductors |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |