7
dc2496aaf
DEMO MANUAL
DC2496A-A/DC2496A-B
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Quick start proceDure
Demo Circuit 2496A-A can be set up to evaluate the per-
formance of the LTC6432-15. Refer to Figure 7 for proper
equipment connections and follow the procedure below:
Two-Tone Measurement:
Connect all test equipment as suggested in Figure 7.
1. The power labels of “VCC 4.75V-5.25V” and GND di-
rectly correspond to the power supply. Typical current
consumption of the LTC6432-15 is about 166mA.
2. Apply two independent signals f1 and f2 from signal
generator 1 and signal generator 2 at 5MHz and 5.2MHz,
while setting the amplitude to –13dBm/tone at the demo
board input (J1).
3. Monitor the output tone level on the spectrum ana-
lyzer. Adjust the signal generator levels such that the
output power me2dBm/tone at the amplifier
output J4, after correcting for external cable losses
and attenuations.
4. Change the spectrum analyzer’s center frequency and
observe the two IM3 tones at 0.2 MHz below and above
the input frequencies. The frequencies of IM3
_LOW
and
IM3
_HIGH
are 4.8MHz and 5.4MHz, respectively. The
measurement levels should be approximately –102dBc;
+ 53dBm is typical OIP3 performance for the DC2496A-A
demo board at 5 MHz.
The OIP3 calculation is:
OIP3 = P
OUT
+ ∆IMD3/2
Where:
P
OUT
is the lower of the two fundamental output signal
products.
∆IMD3 = P
OUT
– P
IM3
; P
IM3
is the higher of the two
third-order intermodulation products.
Single-Tone Measurement:
5. Continue with step 4 above, turn off one signal source
to measure gain and harmonic distortions.
ADDITIONAl DOCUMENTATION
Refer to the demo board link from the LTC6432-15 prod-
uct page for BOM, PCB, Gerber, Check Plots and full
unabridged schematic.
Figure 7. Proper Measurement Equipment Setup
AMPLIFIER
(MINI-CIRCUITS, ZHL-32A-S+
OR EQUIVALENT)
LOW-PASS FILTER
SIGNAL
GENERATOR 1
AMPLIFIER
(MINI-CIRCUITS, ZHL-32A-S+
OR EQUIVALENT)
WERLATONE
H-6278-10
SIGNAL
GENERATOR 2 (HP8644A)
DC2496 F01
SPECTRUM
ANALYZER
V
CC
= 4.75V TO 5.25V
ROHDE & SCHWARZ
FSU8
15dB ATTENUATION PAD
3dB ATTENUATION PAD
6dB ATTENUATION PAD
(OPTIONAL)
6dB ATTENUATION PAD
(OPTIONAL)
LOW-PASS FILTER
DC POWER SUPPLY
V+ GND
(HP8644A)
