Linear Technology DC2460A Demo Manual

DESCRIPTION
Demonstration circuit 2460A is optimized for evaluation
of the LTC 5566 dual programmable gain downconverting
®
mixer. Each channel incorporates an active mixer and a
digital IF VGA with 15.5dB gain control range. The IF gain
of each channel is independently programmable through
the SPI in 0.5dB steps. Its single-ended RF ports are tun-
able via the SPI or parallel control lines and have a range
from 300MHz to 6GHz. The LO port is always matched to
50Ω from 150MHz to 6GHz with 10dB return loss. The
differential IF port is usable from 1MHz to 500MHz. There
is a reduced power mode available through the SPI, which
lowers the total current consumption by 25%.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2460A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
BOARD LAYOUT
DEMO MANUAL DC2460A
300MHz to 6GHz Dual Programmable
Gain Downconverting Mixer
ABSOLUTE MAXIMUM
INPUT RATINGS
Supply Voltage
EN1, EN2, T0, T1 Input Voltages ......–0.3V to V
LO
RF1, RF2 Input Power (300MHz to 6GHz) ..........+20dBm
LO
IF DVGA Peak Differential Input Voltage ....................±4V
SDI, CLK, CSB, PS Input Voltages .... –0.3V to V
SDO Output Current ............................................. ±10mA
Operating Temperature Range (T
Junction Temperature (T
Storage Temperature Range .................. –65°C to 150°C
Caution: This part is sensitive to electrostatic discharge
(ESD). Observe proper ESD precautions when handling
the LTC5566.
Figure 1. DC2460A
+
(V , V , V , IF1 , IF1
DD CC1 CC2
+ –
, LO Input Power (150MHz to 6GHz) .......... +10dBm
+ –
, LO Input DC Voltage .....................................±0.5V
) .................................... 150°C
J
LTC5566
– + –
, IF2 , IF2 ) ..................4V
+ 0.3V
CC
+0.3V
DD
)........ –40°C to 105°C
C
dc2460af
1