Analog Front-End. AFE4300 Datasheet

AFE4300 Front-End. Datasheet pdf. Equivalent

Part AFE4300
Description Integrated Analog Front-End
Feature Product Folder Order Now Technical Documents Tools & Software Support & Community AFE4300 Low-C.
Manufacture etcTI
Datasheet
Download AFE4300 Datasheet



AFE4300
Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
AFE4300 Low-Cost, Integrated Analog Front-End
for Weight-Scale and Body Composition Measurement
AFE4300
SBAS506 – AUGUST 2019
1 Features
1 Weight-scale front-end:
– Supports up to four load cell inputs
– On-chip load cell 1.7-V excitation voltage for
ratiometric measurement
– 68-nVrms Input-Referred noise
(0.1 Hz to 2 Hz)
– Best-fit linearity: 0.01% of full-scale
– Weight-scale measurement : 540 µA
• Body composition front-end:
– Supports up to three tetra-polar complex
impedance measurements
– 6-Bit, 1-MSPS sine-wave generation digital-to-
analog converter (DAC)
– 247.5-µArms, ±20% Excitation source
– 0.1-Ω Measurement RMS noise in 2-Hz BW
– Body composition measurement : 970 µA
• Analog-to-digital converter (ADC):
– 16 Bits, 860 SPS
– Supply current: 110 µA
2 Applications
Weight scales with body composition
measurements
3 Description
The AFE4300 is a low-cost analog front-end
incorporating two separate signal chains: one chain
for weight-scale (WS) measurement and the other for
body composition measurement (BCM) analysis. A
16-bit, 860-SPS analog-to-digital converter (ADC) is
multiplexed between both chains. The weight
measurement chain includes an instrumentation
amplifier (INA) with the gain set by an external
resistor, followed by a 6-bit digital-to-analog converter
(DAC) for offset correction, and a circuit to drive the
external bridge/load cell with a fixed 1.7 V for
ratiometric measurements.
The AFE4300 can also measure body composition by
applying a sinusoidal current into the body. The
sinusoidal current is generated with an internal
pattern generator and a 6-bit, 1-MSPS DAC. A
voltage-to-current converter applies this sinusoidal
current into the body, between two terminals. The
voltage created across these two terminals as a
result of the impedance of the body is measured back
with a differential amplifier, rectified, and the
amplitude is extracted and measured by the 16-bit
ADC.
The AFE4300 operates from 2 V to 3.6 V, is specified
from 0°C to +70°C, and is available in a LQFP-80
package.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
AFE4300
LQFP (80)
12.00 mm × 12.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Functional Block Diagram
INPx
INMx
RG
VLDO
MUX
A1
+
offset
A2
OUTx_FILT
CLK
AVDD
y
Patient
&
ESD
Protection
VSENSEPx
VSENSEMx
MUX
A3
Full Wave
Rectifier
MUX
ADC
(16bit, 860SPS)
SPI
STE
SDIN
SDOUT
SCLK
RDY
IOUTPx
I/Q
Patient
Demodulator
&
Zs ESD
MUX
Protection
IOUTMx
0.9V
VDAC_FILT_IN
1.5k +/- 20%
VDACOUT
DAC
(6bit)
CLK
DDS
(10bits)
Reference
LDO
AUXx
VREF VLDO
AVSS
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



AFE4300
AFE4300
SBAS506 – AUGUST 2019
4 Device and Documentation Support
www.ti.com
4.1 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
4.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
4.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
4.4 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
4.5 Glossary
SLYZ022 TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
5 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
2 Submit Documentation Feedback
Product Folder Links: AFE4300
Copyright © 2019, Texas Instruments Incorporated





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)