LT5504 Просмотр технического описания (PDF) - Linear Technology
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LT5504 Datasheet PDF : 8 Pages
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LT5504
APPLICATIO S I FOR ATIO
to 400µA/CL. For example, the slew rate is reduced to 4V/
µs when CL = 100pF.
VCC
400µA
CC
+
–
VOUT
OUTPUT CURRENTS
FROM RF AND IF
DETECTORS
5504 F04
Figure 4. Simplified Circuit Schematic of the Output Interface
Applications
The LT5504 can be used as a self-standing signal strength-
measuring receiver (RSSI) for a wide range of input
signals from – 75dBm to +5dBm, for frequencies from
800MHz to 2.7GHz.
The LT5504 can be used as a demodulator for AM and ASK
modulated signals with data rates up to 5MHz. Depending
on specific application needs, the RSSI output can be split
into two branches, providing AC coupled data output, and
DC coupled, RSSI output for signal strength measure-
ments and AGC. Refer to Figure 5.
The LT5504 can also be used as a wide range RF power
detector for transmit power control.
TYPICAL APPLICATIO S
C2
C3
100pF
1nF
RF C1
INPUT 100pF
C4
R1
1nF
82Ω
T1
TOKO
617DB-1022
1
VCC
8
VCC
2
LT5504
RF+
VOUT
7
3 RF–
6
LO
4
GND
5
EN
VCC
R3
10k
JUMPER
R2
200Ω
C7
100pF
R5
R4
500k 20k
VOUT
LO
INPUT
5504 F04
Figure 5. LT5504 Evaluation Board Circuit Schematic
Figure 6.Component Side Silkscreen of Evaluation Board
Figure 7. Component Side
Layout of Evaluation Board
Figure 8.Bottom Side
Silkscreen of Evaluation Board
Figure 9. Bottom Side Layout
of Evaluation Board
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.
5504f
7
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