LTC5530ES6TR Linear Technology, LTC5530ES6TR Datasheet - Page 9

• Manufacturer Part Number: LTC5530ES6TR
• Manufacturer: Linear Technology

Specifications of LTC5530ES6TR

• Pin Count: 6
• Screening Level: Industrial
• Package Type: TSOT-23
• Lead Free Status / Rohs Status: Not Compliant

APPLICATIO S I FOR ATIO
Operation
The LTC5530 RF detector integrates several functions to
provide RF power detection over frequencies ranging from
300MHz to 7GHz. These functions include an internal fre-
quency compensated buffer amplifier, an RF Schottky di-
ode peak detector and level shift amplifier to convert the RF
input signal to DC and a delay circuit to avoid voltage tran-
sients at V
shutdown and gain setting capabilities.
Buffer Amplifier
The output buffer amplifier is capable of supplying typi-
cally 4mA into a load. The negative terminal V
out to a pin for gain selection. External resistors connected
between V
the amplifier gain.
The amplifier is unity gain stable; however a minimum gain
of two is recommended to improve low output voltage
accuracy. The amplifier bandwidth is 2MHz for a gain of 2.
For increased gain applications, the bandwidth is reduced
according to the formula:
GAIN
OUT
OUT
1
and V
when powering up. The LTC5530 has both
R
R
A
B
U
M
(R
A
) and V
U
M
to ground (R
W
RF
SHDN
IN
V
CC
R1
(OPT)
22k
R2
M
39pF
C4
is brought
U
B
) will set
Demo Board Schematic
1
2
3
LTC5530ES6
RF
GND
SHDN
IN
V
V
OUT
V
CC
M
6
5
4
A capacitor can be placed across the feedback resistor RA
to shape the frequency response. In addition the amplifier
can be used as a comparator. V
reference voltage. When the internal detector voltage
(which is connected to the positive input of the buffer
amplifier) exceeds the external voltage of V
switch high.
RF Detector
The internal RF Schottky diode peak detector and level
shift amplifier converts the RF input signal to a low
frequency signal. The detector demonstrates excellent
efficiency and linearity over a wide range of input power.
The Schottky diode is biased at about 55 A and drives a
25pF internal peak detector capacitor.
Shutdown
The part is in shutdown mode when SHDN is low. The
supply current is reduced to < 2 A and V
ground via a 280 resistor. When SHDN is asserted high,
the part is enabled after about 8 s.
BANDWIDTH
R3
10k
R4
10k
C2
100pF
C3
(OPT)
C1
0.1 F
V
2.7V TO 6V
V
CC
OUT
5530 DB
(
4
GAIN
MHz
)
4
MHz
M
can be connected to a
•
(
R
LTC5530
A
OUT
R
B
R
is shorted to
M
B
, V
)
OUT
9
will
5530f