2 EVM Connections
2.1 Connection Diagram
2-CH Arbitrary
Func
on Generator
1.3V ± 0.2V
High-Quality Signal
Generator
800MHz, +6dBm
Power Supply
2.5V, 2A
4-CH High Speed
Oscilloscope
50
50
GND
50
GND
50
GND
Signal Analyzer
Balun
50
GND
50
50
50
50
50
50
50
GND
50
50
GND
PC with TICS Pro
and device pro
le
installed
50-
termina
ons on unused outputs are op
onal.
Unused outputs can be disabled in so ware.
Figure 2-1. EVM Connection Diagram
2.2 Power Supply
Apply 2.5 V to the J27 header. The acceptable supply voltage range at the board is 2.4 V to 2.6 V, and the
device can draw up to 1.3 A during operation, so IR drop in supply cables can be non-negligible. Furthermore,
enabling or disabling various system functions can change the device current by 50% or more. It may be helpful
to attach a multimeter or remote supply sensing leads to the supply voltage test points TP2 and TP3 to ensure
the board voltage is within the acceptable range during operation.
2.3 Reference Clock
Connect the CLKINP SMA connector to a high-quality signal source such as an SMA100B signal generator. Both
CLKIN inputs are terminated internally with 50 Ω to AC-GND (that is, GND connection is formed by an internal
capacitor), so no external termination is required or recommended. The other CLKINN SMA connector may be
optionally installed beforehand so the input can be driven differentially, provided a suitable balun or differential
clock source is available.
The default EVM profile configures the device to evaluate the buffer, multiplier, and divider modes with an
800-MHz CLKIN. This frequency can be modified per the operating range of each functional element if desired.
This EVM setup guide and related plots assume 800-MHz CLKIN.
If a suitable input source is available, connect the SYSREF input SMAs to a differential output source such
as an arbitrary function generator. The EVM connections for the SYSREF input are DC-coupled and provide
EVM Connections
4
LMX1204EVM User's Guide
SNAU266 – JULY 2021
Copyright © 2021 Texas Instruments Incorporated
