DC821A - Demo Manual

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 VOUT 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
VOS 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 (VCC = 3.6V, SHDN = 3V, TA = 25°C, source impedance = 50Ω
Ω, unless otherwise noted.
Test circuit shown in Figure 2.)
PARAMETER
CONDITION
VCC Operating Voltage
VALUE
2.7V to 6V
IVCC Operating Current, per channel
IVOUT = 0mA
0.45mA
IVCC Shutdown Current, per channel
SHDN = LO
0.01µA
SHDN Voltage, Chip Disabled
VCC = 2.7V to 6V
0.35V max
SHDN Voltage, Chip Enabled
VCC = 2.7V to 6V
1.4V min
SHDN Input Current, per channel
SHDN = 3.6V
22µA
RFIN Input Frequency Range
300MHz to 11GHz
RFIN Input Power Range
RF Frequency = 300MHz to 7GHz, VCC = 2.7V to 6V
-32dBm to 12dBm
Channel to Channel Isolation
f = 2GHz
45dB
VOS Voltage Range
VOS Input Current
VOUT Start Voltage (No RF Input)
VOUT Output Current
0V to 1V
VOS = 1V
-0.5µA to 0.5µA
RLOAD = 2kΩ, VOS = 0V
110mV to 150mV
SHDN = LO
1mV
VOUT = 1.75V, VCC = 2.7V, ∆VOUT < 10mV
4mA
VOUT Load Capacitance
VOUT Bandwidth
33pF max
CLOAD = 33pF, RLOAD = 2kΩ
2MHz
VOUT Slew Rate
VRFIN = 1V Step, CLOAD = 33pF, RLOAD = 2kΩ
3V/µs
VOUT Noise
VCC = 3V, Noise BW = 1.5MHz, 50Ω RF Input Termination
1mVP-P
VOUT Enable Time
SHDN = LO to HI, CLOAD = 33pF, RLOAD = 2k
8µs
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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 evaluate the performance of the LTC5533. Refer to Figure
1 for proper measurement equipment setup and follow the procedure below:
1.
2.
Connect all DC power supplies’ negative (-) outputs
to demo board Gnd test points (E5 and E10).
5.
Connect voltmeters’ positive (+) leads to the demo
board Vout test points (E2 and E7).
6.
Connect RF signal generators’ outputs to demo
board RF in ports (SMA connectors J1 and J2) via
coaxial cables.
7.
Using jumper cables, connect demo board VCC test
points (E1 and E6) to SHDN test points (E4 and
E8). Now both the detectors are enabled (on) and
are ready for measurement.
Connect VCC DC power supplies’ positive (+) outputs (2.7V to 6V) to demo board VCC test points
(E1 and E6).
NOTE: Do
not exceed 6.5V, the absolute maximum
supply voltage.
3.
4.
Connect VOS DC power supplies’ positive (+) outputs (0V to 1V) to demo board VOS test points (E3
and E9).
Connect voltmeters’ negative (-) leads to demo
board Gnd test points (E5 and E10).
NOTE: Make sure that the power is not applied to the
SHDN test points before it is applied to the VCC test
points. The voltages on the SHDN test points must
never exceed VCC.
8.
Apply RF input signals and measure Vout DC voltages.
NOTE: Do not exceed +12dBm, the absolute maximum RF input power.
Figure 1. Proper Measurement Equipment Setup
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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 821
300MHZ TO 11GHZ PRECISION DUAL RF POWER DETECTOR
3
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