clc1201 Cadeka Microcircuits LLC., clc1201 Datasheet - Page 12

• Manufacturer Part Number: clc1201
• Description: Instrumentation Amplifer
• Manufacturer: Cadeka Microcircuits LLC.

Data Sheet
Pressure Measurement Applications
The CLC1201 is especially suitable for higher resistance
pressure sensors powered at lower voltages where small
size and low power become more significant.
Figure 3 shows a 3kΩ pressure transducer bridge
powered from 5V. In such a circuit, the bridge consumes
only 1.7mA. Adding the CLC1201 and a buffered voltage
divider allows the signal to be conditioned for only 3.8mA
of total supply current.
Small size and low cost make the CLC1201 especially
attractive for voltage output pressure transducers.
Since it delivers low noise and drift, it will also serve
applications such as diagnostic noninvasive blood pressure
measurement.
©2011 CADEKA Microcircuits LLC
Patient
1.7mA
3k
3k
5V
Figure 3: Pressure Monitoring Circuits Operating on a Single 5V Supply
3k
3k
Figure 4: Typical Circuit for ECG Monitor Applications
G = 100
C1
499
CLCxxx
1M
R4
1.3mA
10k
_
+
R1
+
_
CLC1200
24.9k
24.9k
R3
R2
5V
REF
0.1mA
8.25k
5V
Medical ECG
The CLC1201 is perfect for ECG monitors because of
its low current noise. A typical applicaiton is shown in
Figure 4. The CLC1201’s low power, low supply voltage
requirements, and space-saving 8-lead SOIC package
offerings make it an excellent choice for battery-powered
data recorders.
Furthermore, the low bias currents and low current noise,
coupled with the low voltage noise of the CLC1201,
improve the dynamic range for better performance.
The value of capacitor C1 is chosen to maintain stability
of the right leg drive loop. Proper safeguards, such as
isolation, must be added to this circuit to protect the
patient from possible harm.
20k
10k
20k
+
_
CLC1200
G = 7
-3V
3V
CLCxxx
+
_
5V
0.03Hz
High-Pass
Filter
Ref
IN
AGND
Digital
Data
Output
G = 143
www.cadeka.com
Output
1V/mV
12