Philips Semiconductors Linear Products

Product specification

NE/SA/SE5521

LVDT signal conditioner

August 31, 1994

904

DEFINITION OF TERMS

Oscillator Output

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

A measure of how the oscillator amplitude varies with ambient temperature as that

temperature deviates from a 25

°C ambient.

Tempco of Oscillator Frequency

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

deviates from +10V.

Min OSC (OSC) Load

Minimum load impedance for which distortion is guaranteed to be less than 5%.

Linearity Error

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

OSC frequency

+

V

V

Figure 1. Device Power Dissipation vs OSC – OSC Load at +25

°C

2000

1000

800

700

600

500

400

300

200

100

0.2

0.4

0.6

0.8

1 2

3

OSC–OSC LOAD (k

Ω)

5V

15V

10V

VREF = V+ = 20V

PDMAX (SO PACKAGE)

PDMAX (N PACKAGE)

AT TA = 70°C, TJ(MAX) = +150°C

AT TA = +85°C, TJ(MAX) = +150°C

PDMAX (F PACKAGE)

PDMAX (F PACKAGE)

AT TA = +125°C, TJ(MAX) = +165°C

AT TA = +125°C, TJ(MAX) = +150°C