Philips Semiconductors Linear Products
Product specification
LVDT signal conditioner
NE/SA/SE5521
DESCRIPTION
PIN CONFIGURATIONS
The NE/SA/SE5521 is a signal conditioning circuit for use with
Linear Variable Differential Transformers (LVDTs) and Rotary
Variable Differential Transformers (RVDTs). The chip includes a low
distortion, amplitude-stable sine wave oscillator with programmable
frequency to drive the primary of the LVDT/RVDT, a synchronous
demodulator to convert the LVDT/RVDT output amplitude and phase
to position information, and an output amplifier to provide
amplification and filtering of the demodulated signal.
F, N Packages
1
2
3
4
5
6
7
8
9
AMP OUT
+IN
18 V+
17
16
15
C
V
T
–IN
REF
LVDT IN
FEEDBACK
DEMOD OUT
14 OSC
13 OSC
SYNC
GND
N.C.
12
11
10
V
REF/2
FEATURES
• Low distortion
R
T
N.C.
N.C.
• Single supply 5V to 20V, or dual supply ±2.5V to ±10V
• Oscillator frequency 1kHz to 20kHz
TOP VIEW
1
• Capable of ratiometric operation
D Package
• Low power consumption (182mV typ)
AMP OUT
+IN
V+
1
2
3
4
5
6
7
8
16
15
14
C
T
–IN
APPLICATIONS
V
REF
LVDT IN
13 FEEDBACK
• LVDT signal conditioning
DEMOD OUT
OSC
12
• RVDT signal conditioning
• LPDT signal conditioning
• Bridge circuits
SYNC
GND
N.C.
OSC
11
10
9
V
REF/2
R
T
TOP VIEW
NOTE:
1. SOL — released in large SO package only.
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
0 to +70°C
ORDER CODE
NE5521N
NE5521D
SA5521N
SE5521F
DWG #
0407A
0171B
0407A
0583A
0582B
18-Pin Plastic Dual In-Line Package (DIP)
16-Pin Small Outline Large (SOL) Package
18-Pin Plastic Dual In-Line Package (DIP)
18-Pin Ceramic Dual In-Line Package (CERDIP)
16-Pin Ceramic Dual In-Line Package (CERDIP)
0 to +70°C
–40 to +85°C
–55 to +125°C
–40 to +85°C
SA5521D
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
UNIT
V
V
CC
Supply voltage
+20
Split supply voltage
±10
V
Operating temperature range
NE5521
SA5521
SE5521
0 to 70
–40 to +85
–55 to +125
°C
°C
°C
T
A
T
Storage temperature range
–65 to +125
910
°C
STG
1
P
Power dissipation
mW
D
NOTES:
1. For derating, see typical power dissipation versus load curves (Figure 1).
901
August 31, 1994
853-0043 13721