LT5546 데이터 시트보기 (PDF) - Linear Technology
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LT5546 Datasheet PDF : 12 Pages
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LT5546
APPLICATIO S I FOR ATIO
Evaluation Board
The evaluation circuit schematic is drawn in Figure 6. The
components associated with buffers U2 and U3 are in-
cluded to drive a 50Ω load for evaluation purposes only.
There is a unity voltage gain relationship for AC signals
between the evaluation board outputs (I and Q) and the
IOUT+, IOUT– or QOUT+ and QOUT– outputs of the LT5546
when the evaluation board outputs are terminated in 50Ω.
Figure 7. Component Side Silkscreen of Evaluation Board
Figure 8. Component Side Layout of Evaluation Board
Figure 9. Bottom Side Silkscreen of Evaluation Board
Figure 10. Bottom Side Layout of Evaluation Board
15nH
RX INPUT:
2.4GHz TO 2.5GHz
280MHz
10pF
2
IF SAW BP FILTER
RX
FRONT END
1ST LO,
2.12GHz
TO 2.22GHz
15nH
3
MAIN
SYNTHESIZER
AUX
SYNTHESIZER
2ND LO,
560MHz
–10dBm
3.3pF
11
39nH
10
3.3pF
1µF
VGA
f/2
1.8V
1nF
VCC 5, 8
HARD
I-MIXER
LPF
CLIPPER
16
15 I-OUTPUTS
0°
7 IF DET
6 VCTRL
Q-MIXER
14
13 Q-OUTPUTS
90° LPF HARD
CLIPPER
1,4,17
12
LT5546 9
BASEBAND
PROCESSOR
A/D
A/D
D/A
A/D
STBY
EN
5546 F11
Figure 11. 2.4GHz to 2.5GHz Receiver Application (RX IF = 280MHz)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
5546f
11
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