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參數(shù)資料
| 型號(hào)： | TDA8046H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Multi-mode QAM demodulator |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 文件頁數(shù)： | 8/48頁 |
| 文件大?。?/td> | 245K |
| 代理商： | TDA8046H |
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1996 Nov 19
8
Philips Semiconductors
Product specification
Multi-mode QAM demodulator
TDA8046
7
FUNCTIONAL DESCRIPTION
Figure 3 shows the application of the TDA8046
multi-mode QAM demodulator. The frequency of the IF
signal (IF
QAM
) is down converted to a frequency that
equals the symbol rate (r
s
) by a mixer which is driven from
a local oscillator with a frequency of f
CAR
= f
IF
+ r
s
.
After low pass filtering this baseband signal is applied to an
external 8 or 9-bit ADC.
For 256-QAM, a 9-bit ADC is preferred, for the other
modes an 8-bit ADC is sufficient.
The multi-mode QAM demodulator has digital detectors for
AGC, carrier recovery and clock recovery. The on-chip
DACs translate the detector values to analog control
currents which are then integrated by a loop filter.
To perform this loop filtering, an operational amplifier is
integrated after each DAC.
The carrier recovery consists of a two-loop system.
The outer loop is shown in Fig.3, and controls both phase
and frequency at a low speed. The inner loop controls the
carrier phase at a high speed (wide loop bandwidth).
The AGC also consists of two loops; the outer loop is the
coarse AGC and one inner loop is the fine AGC.
The recovered symbols are converted into bits according
to a demapping scheme and represented at the output in
an 8-bit parallel output format. The QAM demodulator can
be initialized and monitored by the I
2
C-bus interface.
Fig.3 Application with multi-mode QAM demodulator.
handbook, full pagewidth
MGG167
LPF
ADC
fCAR = fIF
+
rs
clock recovery
carrier recovery
AGC
DO7 to DO0
CLKOUT
CLKSDV
8 or 9 bits
IFQAM
SAW
TUNER
RF
signal
fclk
TDA8046
I
2
C-BUS
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