SA5521D [NXP]
LVDT signal conditioner; LVDT信号调节器
| 型号： | SA5521D |
| 厂家： | 
NXP |
| 描述： | LVDT signal conditioner |
| 文件： | 总5页 (文件大小：73K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
Philips Semiconductors Linear Products
Product specification
LVDT signal conditioner
NE/SA/SE5521
BLOCK DIAGRAM
V
REF
16
15
13
FEEDBACK
10k
10k
17
–
+
–
+
SINE
OSC
C
R
OSC
T
T
CONV
11
18
3
14
12
OSC
/2
10k
V
V+
REF
10k
7
4
GND/V–
AUX AMP
–IN
+IN
–
+
LVDT IN
2
1
SYNCHRONOUS
DEMODULATOR
6
SYNC
AMP
OUT
5
DOMOD OUT
NOTE:
Pin numbers are for F, N packages.
PIN DEFINITIONS FOR D, F AND N PACKAGES
PIN NO.
SYMBOL
DEFINITION
D
1
2
3
4
5
F, N
1
Amp Out
+IN
Auxiliary Amplifier Out.
2
Auxiliary Amplifier non-inverting input.
Auxiliary Amplifier inverting input.
3
–IN
4
LVDT IN
DEMOD OUT
Input to Synchronous Demodulator from the LVDT/RVDT secondary.
5
Pulsating DC output from the Synchronous Demodulator output. This voltage should be filtered before
use.
6
6
SYNC
Synchronizing input for the Synchronizing Demodulator. This input should be connected to the OSC or
OSC output. Sync is referenced to V
/2.
REF
7
8
7
8
GND
NC
Device return. Should be connected to system ground or to the negative supply.
No internal connection.
--
9
NC
No internal connection.
--
10
11
12
NC
No internal connection.
9
R
T
A temperature stable 18kΩ resistor should be connected between this pin and Pin 7.
10
V
/2
A high impedance source of one half the potential applied to V
. The LVDT/RVDT secondary return
REF
REF
should be to this point. A bypass capacitor with low impedance at the oscillator frequency should also be
connected between this pin and ground.
11
12
13
14
15
16
13
14
15
16
17
18
OSC
OSC
Oscillator sine wave output that is 180° out of phase with the OSC signal. The LVDT/RVDT primary is
usually connected between OSC and OSC pins.
Oscillator sine wave output. The LVDT/RVDT primaries are usually connected between OSC and OSC
pins.
FEEDBACK
Usually connected to the OSC output for unity gain, a resistor between this pin and OSC, and one be-
tween this pin and ground can provide for a change in the oscillator output pin amplitudes.
V
REF
Reference voltage input for the oscillator and sine converter. This voltage MUST be stable and must not
exceed +V supply voltage.
C
Oscillator frequency-determining capacitor. The capacitor connected between this pin and ground should
be a temperature-stable type.
T
+V
Positive supply connection.
902
August 31, 1994
Philips Semiconductors Linear Products
Product specification
LVDT signal conditioner
NE/SA/SE5521
DC ELECTRICAL CHARACTERISTICS
V+ = V
= 10V, T = 0 to 70°C for NE5521, T = –55 to +125°C for SE5521, T = –40 to 85°C for SA5521, Frequency = 1kHz, unless
REF
A A A
otherwise noted.
NE5521
Typ
SA/SE5521
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
Min
Max
20
Min
Typ
12.9
5.3
Max
18
V
CC
Supply current
12.9
mA
mA
V
I
Reference current
Reference voltage range
Power dissipation
5.3
8
8
REF
V
REF
5
V+
280
5
V+
260
P
D
182
182
mW
Oscillator Section
VREF
8.8
VREF
Oscillator output
R = 10kΩ
V
RMS
L
8.8
1.5
THD
Sine wave distortion
No load
1.5
0.4
%
%
Initial amplitude error
Tempco of amplitude
T = 25°C
A
±3
0.4
±3
0.005 0.01
0.005 0.01
%/°C
%
Init. accuracy of oscillator freq.
T = 25°C
A
±0.9
0.05
2.5
±5
±0.9
0.05
3.3
±5
1
Temperature coeff. of frequency
Voltage coeff. of frequency
%/°C
%/V(V
)
REF
2
Min OSC (OSC) Load
300
170
300
170
Ω
Demodulator Section
Linearity error
5V
P-P
input
±0.05 ±0.1
±0.05 ±0.1
%FS
r
VREF
2
VREF
2
Maximum demodulator input
V
P-P
V
Demodulator offset voltage
Demodulator offset voltage drift
Demodulator input current
±1.4
±5
±1.4
±5
mV
OS
5
TCV
5
25
5
25
µV/ C
OS
BIAS
I
–600 –234
–500 –234
nA
%
V
R/2
accuracy
±0.1
±1
±5
50
±0.1
±1
±5
50
Auxiliary Output Amplifier
V
OS
Input offset voltage
Input bias current
Input offset current
Gain
±0.5
–600 –210
10
±0.5
–500 –210
10
mV
nA
I
BIAS
I
nA
OS
A
100
385
1.3
1.6
8.2
100
385
1.3
1.6
8.2
V/mV
V/µs
MHz
V
V
SR
Slew rate
GBW
Unity gain bandwidth product
Output voltage swing
Output short circuit current to
A = 1
V
R = 10kΩ
L
7
7
T = 25°C
A
42
100
42
100
mA
ground or to V
CC
NOTES:
1. This is temperature coefficient of frequency for the device only. It is assumed that C and R are fixed in value and C leakage is fixed over
T
T
T
the operating temperature range.
2. Minimum load impedance for which distortion is guaranteed to be less than 5%.
903
August 31, 1994
Philips Semiconductors Linear Products
Product specification
LVDT signal conditioner
NE/SA/SE5521
DEFINITION OF TERMS
Oscillator Output
RMS value of the AC voltage at the oscillator output pin. This output is referenced to V
REF/2
and is a function of V
.
REF
Sine Wave Distortion
The Total Harmonic Distortion (THD) of the oscillator output with no load. This is not a
critical specification in LVDT/RVDT systems. This figure could be 15% or more without
affecting system performance.
Initial Amplitude Error
A measure of the interchangeability of NE/SA/SE5521 parts, not a characteristic of any one
part. It is the degree to which the oscillator output of a number of NE/SA/SE5521 samples
will vary from the median of that sample.
Initial Accuracy of Oscillator Frequency
Another measure of the interchangeability of individual NE/SA/SE5521 parts. This is the
degree to which the oscillator frequency of a number of NE/SA/SE5521 samples will vary
from the median of that sample with a given timing capacitor.
Tempco of Oscillator Amplitude
Tempco of Oscillator Frequency
A measure of how the oscillator amplitude varies with ambient temperature as that
temperature deviates from a 25°C ambient.
A measure of how the oscillator frequency varies with ambient temperature as that
temperature deviates from a 25°C ambient.
Voltage Coefficient of Oscillator Frequency The degree to which the oscillator frequency will vary as the reference voltage (V
)
REF
deviates from +10V.
Min OSC (OSC) Load
Linearity Error
Minimum load impedance for which distortion is guaranteed to be less than 5%.
The degree to which the DC output of the demodulator/amplifier combination matches a
change in the AC signal at the demodulator input. It is measured as the worst case
nonlinearity from a straight line drawn between positive and negative fullscale end points.
Maximum Demodulator Input
The maximum signal that can be applied to the demodulator input without exceeding the
specified linearity error.
APPLICATION INFORMATION
VREF * 1.3V
OSC frequency +
VREF (RT ) 1.5k) CT
2000
1000
800
700
600
500
400
300
200
100
PD
(N PACKAGE)
MAX
AT T = 70°C, T
= +150°C
= +150°C
A
J(MAX)
(SO PACKAGE)
PD
MAX
AT T = +85°C, T
A
J(MAX)
V
= V+ = 20V
PD
(F PACKAGE)
REF
MAX
AT T = +125°C, T
= +165°C
= +150°C
A
J(MAX)
PD
(F PACKAGE)
15V
MAX
AT T = +125°C, T
A
J(MAX)
10V
5V
0.2
0.4
0.6
0.8
1
2
3
OSC–OSC LOAD (kΩ)
Figure 1. Device Power Dissipation vs OSC – OSC Load at +25°C
904
August 31, 1994
Philips Semiconductors Linear Products
Product specification
LVDT signal conditioner
NE/SA/SE5521
16
8
16
14
12
10
8
I
CC
∆f
OSC
(%)
0
–8
6
I
REF
–16
4
5
8
10 12 14
= V (V)
16 18
20
–55 –40
0
25
70 85 125
V
CC
REF
T
(°C)
A
Figure 4. I
and I vs Temperature
CC
REF
Figure 2. Oscillator Frequency Variation With Voltage
(V
= V = 10V)
CC
REF
(Normalized to V
= V = 10V) T = +25°C
CC A
REF
20
15
10
5
I
I
CC
REF
0
5
10
15
20
25
V
= V (V)
REF
CC
Figure 3. I
and I vs Voltage (T = +25°C)
CC A
REF
905
August 31, 1994
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