Operating Modes; Enable Mode; Shutdown Mode - Analog Devices DC353A Quick Start Manual

Connect the load between the V
measurements are being
DC353A is designed to demonstrate the low noise performance of the LTC1928-5 as well
as its shutdown and current-drive capabilities.

Enable Mode

The device is enabled when the SHDN signal is at 0V. V
5.1V. Noise measurements can be performed as outlined in the LTC1928-5 data sheet.
Loads should be applied between the V
avoid ground loops. Ground loops could result in excessive noise generation. A variable
resistor or current source can be applied to the V
current drive capabilities.

Shutdown Mode

The 2N7002 FET is required to place the LTC1928-5 in shutdown. Shutdown is achieved
by applying five volts to the SHDN terminal which turns the 2N7002 on. The 50Ω
termination resistor at the SHDN terminal minimizes ringing when the user controls
and GND terminals directly at the board if noise
OUT
performed.sdfsdfasdf
+
–
+
+
–
–
Figure 1. DC353 Test and Measurement Setup

OPERATING MODES

OUT
LTC1928S6-5
DEMO CIRCUIT 353A
LOW NOISE BOOST
DC/DC CONVERTER
VIN
GND
VOUT
+
– +
+
–
–
LOAD
+
–
will be between 4.9V and
OUT
and the GND terminals on the demo board to
terminal to characterize the output
OUT
SHDN