L M X 2 5 3 1 L Q 1 9 1 0 E E V A L U A T I O N B O A R D O P E R A T I N G I N S T R U C T I O N S
General Description
The LMX2531LQ1910E Evaluation Board simplifies evaluation of the LMX2531LQ1910E PLL/VCO
synthesizer system. The board enables all performance measurements with no additional support
circuitry. The evaluation board consists of a LMX2531LQ1910E device, and a cable assembly.
The cable assembly is bundled with the evaluation board for connecting to a PC through the parallel
printer port. By means of
MICROWIRE
TM
serial port emulation, the
CodeLoader
software included can
be run on a PC to facilitate the LMX2531LQ1910E internal register programming for the evaluation and
measurement. In addition to this cable assembly, there is a microwire buffer board that ensures that
the proper voltage levels are provided to the microwire inputs and also this reduces digital noise from
computers through the parallel port.
Loop Filter
Phase Margin
34.4 deg
K
φ
90 uA
Loop Bandwidth
6.8 kHz
Fcomp
2.5 MHz
Crystal Frequency
10 MHz
Output Frequency
1834 – 2028 MHz (DIV2=0)
917 – 1014 MHz (DIV2=1)
Supply Voltage
3.0 Volts
VCO Gain
11 MHz/Volt
VCO
CPout
47
pF
2.7 n
F
47
K
Ω
100 pF
100 pF
40 K
Ω
40 K
Ω
Vtune
3
