QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 821
300MHZ TO 11GHZ PRECISION DUAL RF POWER DETECTOR
LTC5533
DESCRIPTION
Demonstration circuit 821 is a precision dual RF
power detector featuring the LTC
®
5533.
The LTC5533 is a dual channel RF power detector for
RF applications operating in the 300MHz to 11GHz
range. Two independent temperature compensated
Schottky diode peak detectors and buffer amplifiers
are combined in a small 4mm x 3mm DFN package.
The RF input voltage is peak detected using on-chip
Schottky diodes. The detected voltage is buffered
and supplied to the V
OUT
pins. A power saving shut-
down mode reduces current to less than
2µA/channel. The initial output starting voltages of
130mV±35mV can be precisely adjusted using the
V
OS
pins.
The LTC5533 operates with input power levels from
-32dBm to 12dBm.
Design files for this circuit board are available. Call
the LTC factory.
LTC is a trademark of Linear Technology Corporation
Table 1. Typical Performance Summary (V
CC
= 3.6V,
SHDN
= 3V, T
A
= 25°C, source impedance = 50Ω, unless otherwise noted.
Ω
Test circuit shown in Figure 2.)
PARAMETER
V
CC
Operating Voltage
I
VCC
Operating Current, per channel
I
VCC
Shutdown Current, per channel
SHDN
Voltage, Chip Disabled
SHDN
Voltage, Chip Enabled
SHDN
Input Current, per channel
CONDITION
I
VOUT
= 0mA
SHDN
= LO
VALUE
2.7V to 6V
0.45mA
0.01µA
0.35V max
1.4V min
22µA
300MHz to 11GHz
-32dBm to 12dBm
45dB
0V to 1V
-0.5µA to 0.5µA
110mV to 150mV
1mV
4mA
33pF max
2MHz
3V/µs
1mV
P-P
8µs
V
CC
= 2.7V to 6V
V
CC
= 2.7V to 6V
SHDN
= 3.6V
RF
IN
Input Frequency Range
RF
IN
Input Power Range
Channel to Channel Isolation
V
OS
Voltage Range
V
OS
Input Current
V
OUT
Start Voltage (No RF Input)
V
OUT
Output Current
V
OUT
Load Capacitance
V
OUT
Bandwidth
V
OUT
Slew Rate
V
OUT
Noise
V
OUT
Enable Time
C
LOAD
= 33pF, R
LOAD
= 2kΩ
V
RFIN
= 1V Step, C
LOAD
= 33pF, R
LOAD
= 2kΩ
V
CC
= 3V, Noise BW = 1.5MHz, 50Ω RF Input Termination
SHDN
= LO to HI, C
LOAD
= 33pF, R
LOAD
= 2k
RF Frequency = 300MHz to 7GHz, V
CC
= 2.7V to 6V
f = 2GHz
V
OS
= 1V
R
LOAD
= 2kΩ, V
OS
= 0V
SHDN
= LO
V
OUT
= 1.75V, V
CC
= 2.7V,
∆V
OUT
< 10mV
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 821
300MHZ TO 11GHZ PRECISION DUAL RF POWER DETECTOR
QUICK START PROCEDURE
Demonstration circuit 821 is easy to set up to evalu-
ate the performance of the LTC5533. Refer to Figure
1 for proper measurement equipment setup and fol-
low the procedure below:
1.
2.
5.
6.
Connect voltmeters’ positive (+) leads to the demo
board Vout test points (E2 and E7).
Connect RF signal generators’ outputs to demo
board RF in ports (SMA connectors J1 and J2) via
coaxial cables.
Using jumper cables, connect demo board V
CC
test
points (E1 and E6) to
SHDN
test points (E4 and
E8). Now both the detectors are enabled (on) and
are ready for measurement.
NOTE:
Make sure that the power is not applied to the
SHDN
test points before it is applied to the V
CC
test
points. The voltages on the
SHDN
test points must
Connect all DC power supplies’ negative (-) outputs
to demo board Gnd test points (E5 and E10).
Connect V
CC
DC power supplies’ positive (+) out-
puts (2.7V to 6V) to demo board V
CC
test points
(E1 and E6).
NOTE:
Do
7.
not exceed 6.5V, the absolute maximum
supply voltage.
3.
Connect V
OS
DC power supplies’ positive (+) out-
puts (0V to 1V) to demo board V
OS
test points (E3
and E9).
Connect voltmeters’ negative (-) leads to demo
board Gnd test points (E5 and E10).
never exceed V
CC
.
8.
4.
Apply RF input signals and measure Vout DC volt-
ages.
not exceed +12dBm, the absolute maxi-
mum RF input power.
NOTE:
Do
Figure 1. Proper Measurement Equipment Setup
2
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