Datasheet

MAX3543 Evaluation Kit
Evaluates: MAX3543
6 ______________________________________________________________________________________
Gain Measurement to the IFOUT_ATV
Port in PAL-B/G Mode
1) Connect the IFOUT_ATV output (J4) to a spectrum
analyzer.
2) Adjust the RFVGC voltage to approximately +3V.
3) Load the predefined factory settings for PAL-B/G
mode by selecting the Factory Settings → PAL/
SECAM B/G/D/K/I (IFOUT2 output) menu item.
4) Enter the desired RF frequency (e.g., 506MHz) into
the RF FREQ text box in the RF Top tab.
5) Set the RF signal generator to the desired RF fre-
quency and a -60dBm power level. Enable the RF
signal generator’s output.
6) Set the center frequency of the spectrum analyzer to
36.15MHz and the span to 1MHz. Set the reference
level to 0dBm. Increase the input power of the sig-
nal generator until the output level reaches -28dBm.
This is the output level that corresponds to approxi-
mately 0.5V
P-P
output at the IC's IFOUT2 pin. The
voltage gain of the receiver can be calculated by
taking the difference in dB between the input and
output power and applying correction factors to
compensate for the 50ω-to-75ω min loss pad at the
input (R10 and R11), and R13 500ω series resistor
at the output.
Voltage gain can be calculated from:
A
V
= 3.96dB + 20 LOG(V
OUT,RMS
/V
IN,RMS
)
+ 20.83dB
or
A
V
= (P
OUT
- P
IN
) + 24.8dB
where:
3.96dB is the voltage loss due to the input min
loss pad,
( )
IN
IN,RMS
P dBm 30
V 50x10
10
 
−
=
 
 
is the input RMS voltage calculated from the input
power P
IN
(i.e., power from the RF signal genera-
tor),
( )
OUT
OUT,RMS
P dBm 30
V 50x10
10
 
−
=
 
 
is the output RMS voltage calculated from the
output power P
OUT
(i.e., power at the spectrum
analyzer input),
20.83dB (i.e., 20 LOG(550/50)) is the voltage loss
due to R13 series resistor.
The calculated voltage gain should be approxi-
mately 44dB.
Connecting the MAX3543 to Digital and
Analog Demodulators
The EV kit includes additional input and output
connectors to allow for quick and easy evaluation of the
IC's performance with digital and analog demodulators.
The differential input of the digital (or digital + analog)
demodulator can be connected to the DTV 3-pin header
on the EV kit. The IFAGC output of the demodulator
should be connected to the IFVGC terminal on the EV kit.
The IC controls its RF gain autonomously, so the RFVGC
terminal on the EV kit should be left unconnected.
Older analog demodulators with single-ended input and
built-in IF gain-control stage can be connected using the
ATV 2-pin header on the EV kit. The RFVGC terminal on
the EV kit should be left unconnected.
The device also provides the buffered reference clock
output that can be used by demodulators. Use the
REFOUT 2-pin header to connect the clock output to the
demodulator reference clock inputs.
Layout Considerations
Contact Maxim to obtain the MAX3543's reference
design layout to use as a starting point for PCB designs.
Refer to the Layout Recommendations section in the
MAX3543 IC data sheet for more information.