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DAC53401 Datasheet(PDF) 36 Page - Texas Instruments

No. de Pieza. DAC53401
Descripción  DACx3401 10-Bit and 8-Bit, Voltage-Output Digital-to-Analog Converters With Nonvolatile Memory and PMBus™ Compatible I2C Interface in Tiny 2 × 2 WSON
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

DAC53401 Datasheet(HTML) 36 Page - Texas Instruments

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+
±
DACx3401
5 V
TLV342S
+
±
5 V
LM158
±5 V
2 k
2 k
1 k
20 k
0.1 µF
DACx3401
SHDN
36
DAC53401, DAC43401
SLASES7 – JULY 2019
www.ti.com
Product Folder Links: DAC53401 DAC43401
Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
Typical Applications (continued)
9.2.3 Medical Alarm Generation
All medical devices implementing an alarm system shall comply to IEC60601-1-8 standard for medical alarms (as
per IEC60601-1 Ed 3.1). The regulatory tests are done at a system level; therefore, system level acoustics play a
major role in the compliance. A medical alarm is a common functional block in many medical devices. A portable
implementation is needed that can also be customized to fit mechanical and audio or acoustic requirements. The
DACx3401-based design is aimed at providing a programmable, standalone, and robust implementation at a very
low cost.
There are three types of alarms with different timing requirements: low priority, medium priority, and high priority.
Usually, for easy identification, different timings are employed for different equipment. Medical device
manufacturers prefer using their signature melodies within the limits of the standard.
Figure 20. Medical Alarm
9.2.3.1 Design Requirements
Generate pulse envelope for each of the three alarm priorities, upon trigger
Generate the programmable pulse frequency
Mix the envelope and the pulse to create the burst pattern
Drive a speaker with the selected alarm tone
9.2.3.2 Detailed Design Procedure
Two DACx3401 devices are required: one device to generate the pulse envelope and the burst, and the second
device to generate the pulse frequency. As shown in Figure 20, both these signals are mixed together using the
TLV342S amplifier with shutdown. The combined signal is then fed to a power amplifier, such as the LM158, to
drive the speaker. This design provides a gain of 2 at the speaker amplifier. The actual gain required in a system
depends on the acoustic output requirements from the speaker. The RC high-pass filter, designed for a cut-off
frequency of approximately 80 Hz at the input of LM158, removes the dc component from the signal so that this
signal can be applied to the speaker directly. As per the medical alarm standard, the pulse frequency must be
above 150 Hz. As a result of the square-wave pulse frequency and the mixing done by TLV342S, the speaker
output has multiple harmonics of the fundamental pulse frequency, thus fulfilling the requirement of the medical
alarm standard. The DACx3401 provide various options to program the pulse frequency and envelope timings.
See the Medical Alarm Generation Mode section for the alarm configuration options. The frequency of a square
wave can be calculated using Equation 3. The square wave function has a limited number of frequencies
because this function is programmed by the SLEW_RATE bit alone. To get a higher number of frequencies,
generate a triangular waveform with comparator mode output. The triangular waveform can be generated using
Equation 4. The DAC output can be set to comparator mode by fixing the VFB pin to the midscale of the DAC
using a resistive voltage divider from VDD. Select VDD as the reference in this case using the
GENERAL_CONFIG register.


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