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參數(shù)資料
| 型號： | 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)： | 3/48頁 |
| 文件大小： | 245K |
| 代理商： | TDA8046H |
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1996 Nov 19
3
Philips Semiconductors
Product specification
Multi-mode QAM demodulator
TDA8046
1
FEATURES
Different modulation schemes: 4, 16, 32,
64 and 256-QAM
Digital demodulator and square root raised cosine
Nyquist filter with roll-off of 15% or 20%
High performance adaptive equalizer (no training
sequence needed)
Digital detectors for generation of required control
voltages for carrier recovery, clock recovery and AGC
Digital-to-analog converters and operational amplifiers
allowing high flexibility for selection of the (PLL) loop
time constants
High maximum symbol rate (r
s
) of 7 Msymbols/s
Input format: Straight binary or 2’s complement
(up to 9 bits, TTL compatible)
Output format: 8-bit wide bus (CMOS compatible)
I
2
C-bus interface to initialize and monitor the
demodulator. When no I
2
C-bus usage; 64-QAM,
20% roll-off factor in default mode
5 V peripheral and analog supply voltage
3.3 V core supply voltage
Boundary scan test.
2
APPLICATION
Demodulation for digital cable TV and cable modem.
3
QUICK REFERENCE DATA
Notes
1.
2.
The supply currents are specified for the maximum symbol frequency.
The implementation loss (IL) of the demodulator is defined as the distance between the measured and theoretical
BER curve as function of signal-to-noise ratio at a BER = 10
6
for a back-to-back measurement at the IF frequency.
This performance depends on the chosen loop parameters (see Application notes).
4
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
DDD(core)
V
DDD
V
DDA
I
DDD(core)
I
DDD
I
DDA
r
s
IL
α
SNR
lock
core supply voltage
digital peripheral supply voltage
analog supply voltage
core supply current
digital peripheral supply current
analog supply current
symbol rate
implementation loss
Nyquist roll-off (programmable)
signal-to-noise ratio for locking a
64-QAM constellation
signal-to-noise ratio for locking a
256-QAM constellation
3.00
4.75
4.75
21
3.30
5.00
5.00
100
14
16
0.7
15 or 20
3.60
5.25
5.25
7
V
V
V
mA
mA
mA
Msym/s
dB
%
dB
V
DDD(core)
= 3.3 V; note 1
V
DDD
= 5 V; note 1
V
DDA
= 5 V; note 1
note 2
27
dB
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA8046H
QFP64
plastic quad flat package; 64 leads (lead length 1.95 mm);
body 14
×
20
×
2.8 mm
SOT319-2
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