Quick Start Procedure - Analog Devices LTC5597 Manual

DEMO MANUAL DC3129A-KIT
NOTES ON TEST EQUIPMENT AND SETUP
Use a high performance signal generator with accu-
n
rate output power levels up to 70GHz, such as Agilent
E8257D.
DC3129A-KIT includes Linduino DC2026C, and the
n
demo board DC3128A assembled with1.85mm con-
nector for best performance up to 70GHz.

QUICK START PROCEDURE

1. Remove the DC3129A-KIT from its protective packag-
ing in an ESD-safe working area, connect USB cable
to PC(see Figure 1).
2. Set JP1 which provides the 3.3V to V
regulator.
3. Download and install
4. The Eval Kit comes with a Linduino board pre-loaded
with firmware. Follow Figure 2 to re-load the firmware
if necessary, which can be downloaded from www.
analog.com.
5. Follow instruction from QuikEval which will automati-
cally update the GUI.
6. Connect USB cable from PC to Linduino board. Con-
nect the RF input to the signal generator at the 1.85mm
connector, J1.
DEMO BOARD USAGE NOTES
1. Evaluation DC3129A-KIT has provisions for inter-stage
filter cap. Additional capacitor (C3) can be added to
slow down the transient response to reduce the output
ripple. The range for C3 is 10pF to 1nF.
2. Output power is calculated using slope and intercept.
2
by the on board
CC
QuikEval if it's not yet installed.
Connecting cable for RF signal should be rated up to
n
70GHz for the best performance.
Optional input attenuation can be used to improve
n
return loss, but also shifts the log intercept point
accordingly.
7. Set the frequency and power level (less than +10dBm)
of the signal generator.
8. Open QuikEval, and set the frequency of signal to be
measured. Push "READ" to measure RF power. Using
the default calibration would be loading the nominal
slope and intercept from LTC5597 data sheet values.
See Figure 3.
9. For higher accuracy, Calibration can be performed using
the GUI at various frequency with two point calibration.
Set input power level to the corresponding calibration
points on the GUI, and calibrate accordingly by clicking
the corresponding button.
10. Read RF power using the GUI.
3. ADC count • 4.9mV/slope + intercept = output power.
Slope is derived from two point calibration in the linear
region of transfer function.
4. A minimum two point calibration is necessary for most
applications. Additional calibration points will improve
the accuracy of the power detection.
Rev. 0