MC92314 Datasheet, PDF (89/100 Pages) Motorola, Inc – DVB-T Single Chip Demodulator Application Note

Freescale Semiconductor, Inc.
Electrical Characteristics
SECTION 6
ELECTRICAL CHARACTERISTICS
6.1 MC92314 Electrical Considerations
The power consumption of the device at full operation is app. 1.7 W in a typical DVB-T
application, details are given below.
The supply voltage for the MC92314 is 3.3 V.
Using two samples of the MC92314 the current consumption in different modes of operation was
measured. The supply voltage was 3.3 V. The results are given in Table 6-1 and Figure 6-1
n below:
tio ^{Table 6-1. Current and Power Ponsumption at different datarates}
ma _{CONFIGURATION}
Infor ^{QPSK, coderate 2/}₃^{, G.I. 1/}₃₂
y _{16-QAM, coderate} 2_{/3, G.I.} 1_/32
ar _{64-QAM, coderate 2/3, G.I. 1/32}
in _{64-QAM, coderate 7/8, G.I. 1/32}
USEFUL
DATARATE
(MBit/s)
SAMPLE 1
CURRENT POWER
(mA)
(W)
8.04
460
1.52
16.09
485
1.60
24.13
510
1.68
31.67
530
1.75
SAMPLE 2
CURRENT
(mA)
470
POWER
(W)
1.55
490
1.62
520
1.72
535
1.77
lim _NOTE
Pre ^{The figures for the useful datarate are taken from the DVB-T}
specifictaion reference [1-1], they give the datarate of the MPEG-2
transport stream at the output of the MC92314.
It can be seen that the maximum supply current in the mode with the highest datarate doesn’t
exceed 535 mA, leading to a power consumption of about 1.77 W.
In the figure below the mean value of both samples is drawn versus the useful datarate:
Single Chip DVB-T Demodulator - Rev. 1.3 (11/27/98)
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MOTOROLA
6-1