AD22151YR-REEL Analog Devices Inc, AD22151YR-REEL Datasheet - Page 6

• Manufacturer Part Number: AD22151YR-REEL
• Description: IC MAGNETIC FIELD SNSR LIN 8SOIC
• Manufacturer: Analog Devices Inc
• Type: Linear - Unipolar, Bipolarr

Specifications of AD22151YR-REEL

• Rohs Status: RoHS non-compliant
• Sensing Range: Unlimited
• Voltage - Supply: 4.5 V ~ 6 V
• Current - Supply: 10mA
• Current - Output (max): 15mA
• Output Type: Analog, Ratiometric
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Features: -

AD22151
Knowing the values of R3 and R4 and noting Equation 2, the
parallel combination of R2 and R4 required is:
Thus:
NOISE
The principal noise component in the sensor is thermal noise
from the Hall cell. Clock feedthrough into the output signal is
largely suppressed with application of a supply bypass capacitor.
Figure 12 shows the power spectral density (PSD) of the output
signal for a gain of 5 mV/Gauss. The effective bandwidth of the
sensor is approximately 5.7 kHz, as shown in Figure 13. The
PSD indicates an rms noise voltage of 2.8 mV within the 3 dB
bandwidth of the sensor. A wideband measurement of 250 MHz
indicates 3.2 mV rms (see Figure 14a).
In many position sensing applications, bandwidth requirements
can be as low as 100 Hz. Passing the output signal through a
100 Hz LP filter, for example, would reduce the rms noise volt-
age to
output amplifier response by connection of a capacitor across
feedback resistor R3 as a simple means of reducing noise at the
expense of bandwidth. Figure 14b indicates the output signal of
a 5 mV/G sensor bandwidth limited to 180 Hz with a 0.01 µF
feedback capacitor.
Note: Measurements were taken with a 0.1 µF decoupling
capacitor between V
LOGMAG
5 dB/div
100 H
R
Figure 12. Power Spectral Density (5 mV/G)
1 H
2
1 mV. A dominant pole may be introduced into the
=






B MARKER
START: 64Hz
NOISE: PSD (8mV/GAUSS)



6 071
.
1
CC
k
(
85
15 1
Ω
and GND at 25°C.
64Hz



k
–
–
Ω
1



)
141 666
=
6 071
.
.
1
k
k
Ω
Ω









=
STOP: 25.6kHz
RMS: 64
6 342
.
Y: 3.351 H
k
Ω
–6–
Figure 14a. Peak-to-Peak Full Bandwidth (10 mV/Division)
Figure 13. Small Signal Gain Bandwidth vs. Gain
Figure 14b. Peak-to-Peak 180 Hz Bandwidth
(10 mV/Division)
TEK
TEK
7
6
5
4
3
2
0
1
1
STOP:
STOP:
CH2
CH2
25.0 kS/s
25.0 kS/s
2
10.0mV
10.0mV
[
[
3dB FREQUENCY (kHz)
B W
B W
GAIN – mV/Gauss
3
M2.00ms
3ACQS
M2.00ms
7ACQS
T
T
4
[
[
5
CH2 p-p
19.2mV
CH2 p-p
4.4mV
REV. A
6