TDA8046 Datasheet, PDF (36/48 Pages) NXP Semiconductors – Multi-mode QAM demodulator

Philips Semiconductors
Multi-mode QAM demodulator
Product specification
TDA8046
8 LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
V_DDD
V_max
P_tot
T_stg
T_amb
digital supply voltage
maximum voltage on all pins
total power dissipation
storage temperature
operating ambient temperature
CONDITIONS MIN.
−0.3
0
T_amb = 70 °C −
−55
0
MAX.
6.0
V_DDD
1.4
+150
70
UNIT
V
V
W
°C
°C
9 THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
R_{th j-a}
thermal resistance from junction to ambient
CONDITIONS
in free air
VALUE
50
UNIT
K/W
10 DEMODULATOR AND HALF NYQUIST FILTER CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS MIN. TYP. MAX.
α
roll-off
pass-band ripple
−
15 or 20 −
−
0.05 −
stop-band ripple
see Figs 5 and 6
ISI_power
power inter-symbol interference (15% roll-off filter) note 1
power inter-symbol interference (20% roll-off filter) note 1
−
−43
−
−
−44
−
UNIT
%
dB
dB
dB
Note
1. Definition of the power inter-symbol interference:
( N_conv – 1) ⁄ 2
2×
∑
C_conv(4k) ²
ISI_power (dB) = 10 log -------------------^k----C⁼----^1c--_o---_n--_v---(--0---)----₂----------------------
Where N_conv is the number of coefficients C_conv. C_conv(k) represent the coefficient resulting from the convolution of
the transmission and reception filters (K indicates the K^th coefficient).
The power ISI specified in Table 1 has been calculated on a filter resulting from the convolution of the TDA8046 filters
and a truncated half-Nyquist filter with 57 T/4 taps for the 15% roll-off filter and 41 T/4 taps for the 20% roll-of filter
(see “Application note AN96048” - Appendix B).
1996 Nov 19
36