AMC7836 Datasheet, PDF (25/88 Pages) Texas Instruments – AMC7836 High-Density, 12-Bit Analog Monitor and Control Solution With Multichannel ADC, Bipolar DACs, Temperature Sensor, and GPIO Ports

www.ti.com
AMC7836
SLAS986C – NOVEMBER 2014 – REVISED APRIL 2016
7.3 Feature Description
7.3.1 Digital-to-Analog Converters (DACs)
The AMC7836 device features an analog-control system centered on sixteen 12-bit DACs that operate from the
internal reference of the device. Each DAC core consists of a string DAC and output-voltage buffer.
The resistor-string structure consists of a series of resistors, each with a value of R. The code loaded to the DAC
determines at which node on the string the voltage is tapped off to be fed into the output amplifier. The voltage is
tapped off by closing one of the switches connecting the string to the amplifier (see Figure 48). This architecture
has inherent monotonicity, voltage output, and low glitch. This architecture is also linear because all the resistors
are of equal value.
R
R
R
To Output
Amplifier
R
R
Figure 48. DAC Resistor String
7.3.1.1 DAC Output Range and Clamp Configuration
The 16 DACs are split into four groups, each with four DACs. All of the DACs in a given group share the same
output range and clamp voltage value, however, these settings can be set independently for each DAC group.
After power-on or a reset event the following actions take place: the DAC outputs are directed automatically to
the corresponding clamp value; the DAC groups output ranges are set by the auto-range detector and; all DAC
data registers and data latches are set to the default values. Figure 49 shows a high level block diagram of each
DAC in the AMC7836 device.
Copyright © 2014–2016, Texas Instruments Incorporated
Product Folder Links: AMC7836
Submit Documentation Feedback
25