Linear Technology LTC2997 Demo Manual

DESCRIPTION
Demonstration circuit 1767 features the LTC
accuracy, analog output, temperature sensor.
DC1767 is designed to allow easy evaluation of the LTC2997.
QUICK START PROCEDURE
Jumper Settings
D+/D–: These jumpers select which temperature input con-
nects to the LTC2997. INT uses the internal temperature
sensor, EXT uses an off-board sensor connected to the
D+/D– analog inputs, and Q1 uses the transistor stuffed
in Q1 (the MMBT3904 by default).
Analog Connections
Analog signal connections are made via the row of turret
posts along the edges of the board.
GND: (2 turrets) These turrets connect directly to the
internal ground planes.
EXTERNAL DIODES
CONNECTED HERE
2997, a high
®
INPUTS
Figure 1. Proper Measurement Equipment Setup
DEMO MANUAL DC1767
Remote/Internal
Temperature Sensor
Design files for this circuit board are available at
http://www.linear.com/demo
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.
VCC: Connect a 2.25V to 5.5V power supply to this turret.
D+/D–: Should be set to EXT. This is where the external
diode should be connected.
VREF: Output Only. 1.8V ouput that can drive up to ±200μA
of load.
VPTAT: The voltage on this turret is proportional to the
sensor's absolute temperature, with a slope of 4mV/K.
VPTAT can drive up to a ±200μA load and up to 1000pF
capacitive load.
1.8V REFERENCE OUTPUT
ANALOG VOLTAGE OUTPUT, 4mV/k
LTC2997
dc1767f
1