DATA SHEET
D
LNDSP16-3a/b
Portable Three Terminal Heart Rate Monitor with
AGC, Fast Capture & Diagnostic Quality Filters
GENERAL DESCRIPTION
The LNDSP16 is a diagnostic quality heart rate monitor with
unique features making it uniquely suited for portable heart
rate aquisition in dynamic environments.
The LNDSP16 is capable of acquiring heart rate from the arm
only, using three (3) electrode leads. The device includes a
high gain instrumentation amplifier with extremely low offset
(<20uV) with a termination scheme offering 123db of common
mode rejection. The device includes an automatic gain
control (AGC) feature, time constant accelerator, and
dynamic common mode drive to enable fast capture of the
baseline and heart rate waveform. The LNDSP16-3b
includes an interface to an accelerometer allowing capture of
heart rate images during movement (patents pending).
The LNDSP16-3a/b operates from 5V, but draws extremely
low current, making it ideal for portable device operation. The
device also utilizes high order Bessel filters which have been
shown to be least disruptive to diagnostic results, as well as
advanced Hilbert & STC transform identification algorithms
capable of dealing with HRV.
FEATURES
Three Electrode Interface
Low Power for Portable Applications
Capable of Arm Only Acquisition
<20uV Total Input Offset Error
123db CMRR Termination
Automatic Signal Acquisition:
Automatic Gain Control (AGC)
Time Constant Accelerator for
Quick Baseline Recapture
Common Mode Driver Terminal
AC Only Feedback
Diagnostic Quality Filters
Advanced Capture Algorithms
50/60 Hz Interference Elimination
Optional Accelerometer & Algorithms
Diagnostic Capture During Movement
APPLICATIONS
Portable Heart Rate Equipment
Portable Fitness & Wellness Products
Non-Critical Diagnostics
PIN DESCRIPTION
Pin
Number
1
2
3
4
5
Description
Postive Electrode (V
PE
)
CM Electrode (V
CM
)
Negative Electrode (V
NE
)
Ground (GND)
Supply Voltage (V
DD
)
Figure 1 – 3-Electrode Heart Rate Waveform from the Arm
Linear Dimensions Semiconductor Inc.
22620 Ricardo Rd, Cupertino CA 95014 USA
tel 312.321.1810
fax 312.321.1830
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
