Linear Technology 1464 Quick Start Manual page 2

DEMO CIRCUIT DC1464 QUICK START GUIDE FOR LTC6412
Table 1. DC1464 SMA Connector Descriptions
CONNECTOR FUNCTION
Differential input connected to input balun for single-ended operation.
J1 (+IN)
Drive from a 50 Ohm signal source. No external termination needed.
Differential output connected to output balun for single-ended operation.
J2 (+OUT)
Impedance matched to 50 Ohms for direct connection to a 50 Ohm network/spectrum analyzer input.
J3 (-IN) Differential input. Not connected by default. Resistor R9 can be removed to drive the input balun differentially.
J4 (-OUT) Differential output. Not connected by default. Capacitor at C21 can be moved to C9 to drive the differential outputs.
SMA terminal. Default connected in parallel with –VG turret to the –VG pin of LTC6412. Used to apply fast control
J5 (VGAIN)
signals. Move jumper R15 to location R14 and jumper R19 to location R18 to configure for +V
J6 (TEST IN)
Cascaded 1:1 balun thru connection. Used to estimate the loss of the input balun at the frequency of interest.
J7 (TEST OUT)
Figure 1. Picture of DC1464 Top Silkscreen with recommended
default measurement setup connections shown in maroon.
2
control.
G