Texas Instruments AMC1311, User Manual

Page: 3 / 15

Copyright © 2017, Texas Instruments Incorporated
4 1 + 4 2 + 4 3 =
8
62 1
F 8
+02
8
+02
T 4 4
www.ti.com
Analog Interface
3 SLAU745 – November 2017
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
AMC1311EVM Users Guide
With user installed resistor options R1 through R3, an external voltage source can be applied between
TP1 and GND1 via J1.2 or TP2. As depicted in
Figure 1 , with R4 installed as 10 k Ω , resistors R1 through
R3 can be chosen according to Equation 1 :
(1)
2.2 Shutdown
The AMC1311 features a shutdown option which is an active high input. Shunt jumper SH-J7 is installed
by default and allows for normal operation of the AMC1311 device. When the shunt jumper is removed,
the AMC1311 enters into a low power mode by means of an internal pullup resistor for battery or other
power sensitive applications. For external shutdown operation, J1.3 provides access to the SHTDN pin
when shunt SH-J7 is removed.
2.3 Analog Output
The analog output from the AMC1311EVM board is a fully differential signal centered at 1.44 V. The
differential output of U1 is available on the two screw terminals of J2 as shown below in
Figure 2 . U4 and
U5 provide the user with a single-ended version of the analog output on J6 pin 1. U5 is designed to
provide bias voltage to the difference amplifier configuration of U4. The single ended output provides unity
gain with an output voltage swing from 0.5 V to 2.5 V. If a different bias voltage is desired, the shunt on J8
can be moved to cover pins 2-3 and an external voltage source may be applied to TP4 referenced to
GND2 via TP3.
Figure 2. AMC1311EVM Schematic – Analog Output Section