AMC1204_15 Datasheet, PDF (24/37 Pages) Texas Instruments – AMC1204 20-MHz, Second-Order, Isolated Delta-Sigma Modulator

AMC1204, AMC1204B
SBAS512E – APRIL 2011 – REVISED SEPTEMBER 2015
www.ti.com
Typical Application (continued)
8.2.2 Example of a Resolver-Based Motor Control Analog Front End
Figure 51 shows an example of two AMC1204 and AMC1204B devices and one ADS1209 (a dual-channel, 10-
MHz, non-isolated modulator) connected to an AMC1210, building the entire analog front end of a resolver-based
motor control application.
For detailed information on the ADS1209 and AMC1210, visit the respective device product folders at
www.ti.com.
Resolver
PWM1
PWM2
ADS1209
IN1
CLK1
IN2
Filter Module 1
Comparator
Filter
Input
Control
Sinc Filter/
Integrator
Time
Measurement
Current
Shunt
Resistor
CLK2
IN3
AMC1204,
AMC1204B ^CLK3
Current
Shunt
Resistor
AMC1204,
AMC1204B
IN4
CLK4
Filter
Module 2
Filter
Module 3
Filter
Module 4
Control Module
Signal
Generator
AMC1210
Interrupt
Unit
Register
Map
Interface
Module
CLK
RST
INT
ACK
CS
ALE
RD
WR
M0
M1
AD0
AD7
Figure 51. Example of a Resolver-Based Motor Control Analog Front End Schematic
8.2.3 Isolated Voltage Sensing
The AMC1204 is optimized for current-sensing applications using low-impedance shunts. However, the device
can also be used in isolated voltage-sensing applications if the impact of the (usually higher) impedance of the
resistor used in this case is considered. Figure 52 shows a simplified circuit typically used in high-voltage sensing
applications.
L1
R₁
R₂
R_IN
L2
Figure 52. Voltage Measurement Application
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