參數(shù)資料
型號(hào): L64777
英文描述: L64777 DVB QAM Modulator technical manual 6/00
中文描述: L64777的DVB QAM調(diào)制器技術(shù)手冊(cè)6 / 00
文件頁(yè)數(shù): 21/124頁(yè)
文件大?。?/td> 988K
代理商: L64777
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I/O
2-7
Figure 2.4
Analog I/Q Output Interface Diagram
The differential outputs terminate externally (the external components
must provide termination to both differential lines, and the DAC achieves
maximum linearity in differential mode).
The L64777 I and Q component outputs are available in 10-bit digital
format. The related clock depends on the PLL mode: OCLK is used in
Mode 1; PCLK is used in Mode 2. The output format can be programmed
either as a two’s complement, or as a sign magnitude representation.
The analog I- and Q-modulated output signals are at a sampling rate of
OCLK, which is four times the QAM symbol rate. The input to the
digital-to-analog conversion is available also in a digital format at the
DIG_I and DIG_Q bus pins.
AVDD1/COMP1
VREF1
VREF2
10-Bit DAC
10
AVSS2
AVDD2/COMP2
Differential Q Output
QAM_Q, QAM_Qn
Differential I Output
QAM_I, QAM_In
VSS
AVSS1
R
VDDX1
3
On-Chip
Off-Chip
Q Filter Output
I Filter Output
Functional
Test Bus
(Test mode is
selected using
FT mode pins)
VDDX2
10
10-Bit DAC
R
3
2
10
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