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參數(shù)資料
| 型號(hào)： | TDA8060ATS |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 衰減器 |
| 英文描述： | Satellite ZERO-IF QPSK down-converter |
| 中文描述： | RF/MICROWAVE DOWN CONVERTER |
| 封裝： | PLASTIC, SSOP-24 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大小： | 87K |
| 代理商： | TDA8060ATS |
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2000 Nov 10
10
Philips Semiconductors
Product specification
Satellite ZERO-IF QPSK down-converter
TDA8060ATS
handbook, full pagewidth
FCE414
RF
SOURCE
Vi (dB)
50
50
RF
SOURCE
50
1.5 pF
1.5 pF
RFB
RFA
TDA8060ATS
IOUT
QOUT
Vo (dB)
high
impedance
probe
Fig.5 Gain control diagram for asymmetrical RF input.
APPLICATION INFORMATION
Close attention should be paid to the design of the external
tank circuit of the VCO so that it covers the
920 to 2200 MHz frequency range. Both series 6
resistors kill all parasitic oscillations that could alter this
frequency range. The BB835 Siemens varicap diodes are
mentioned because they provide the highest C
max
/C
min
ratio as well as the least parasitic elements in our
frequencyrange. The U-shapedinductance can beprinted
with a total length of approximately 20 mm.
Filters LP1 and LP2 are not detailed in this data sheet
because their design only depends on the global system.
As the TDA8060ATS has been designed to be compatible
with DVB, DSS and Asian DVB, the cut-off frequencies
and the tolerance in group delay, the orders of the filters
cannot be globally established.
Nevertheless, the TDA8060ATS internally filters the
basebandat 100 MHzand thenominallevelsatinputsand
outputs mentioned in the characteristics table should be
respected. The input impedance of LP1 and LP2 must
exceed 400
to avoid signal distortion.
The converter outputs (pin IOUT and pin QOUT) must be
AC-coupled via the low-pass filter to the baseband
amplifiers inputs (pin IBBIN and pin QBBIN). Because of
the high impedance at pin IQBBIN, a 100 nF capacitor
gives a high-pass frequency of 160 Hz.
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