
MAX9924–MAX9927
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
6
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Typical Operating Characteristics (continued)
(VCC = 5V, VGND = 0V, MAX9925/MAX9927 gain setting = 1V/V. All values are at TA = +25°C, unless otherwise noted.)
-5
5
0
15
10
25
20
30
-50
0
25
-25
50
75
100
125
MINIMUM AND ZERO-CROSSING
THRESHOLD vs. TEMPERATURE
MAX9924
toc10
TEMPERATURE (
°C)
THRESHOLD
(mV)
VCM = 2.5V
fIN = 5Hz
ZERO CROSSING
AT 5Hz
MINIMUM THRESHOLD
ZERO CROSSING
AT 1Hz
0
25
50
75
100
CMRR vs. TEMPERATURE
MAX9924
toc11
TEMPERATURE (
°C)
CMRR
(dB)
-50
25
50
-25
0
75
100
125
MAX9924
VCM = 0 TO 5V
INPUT SIGNAL vs. COUT WITH
WATCHDOG TIMER EXPIRED
MAX9924 toc12
20ms/div
VBIAS
5V
fIN = 5Hz
COUT
INPUT SIGNAL
INPUT SIGNAL vs. COUT WITH
WATCHDOG TIMER EXPIRED
MAX9924 toc13
100
μs/div
VBIAS
5V
fIN = 1kHz
COUT
INPUT SIGNAL
833mV
MAX9924 toc14
100
μs/div
OVERDRIVEN INPUT VOLTAGES
(MAX9924)
MAX9924 toc15
200
μs/div
DIRN OPERATION
(MAX9924)
MAX9924 toc16
INPUT REFERRED NOISE DENSITY
vs. FREQUENCY
10
20
60
40
80
100
10
1k
100
10k
100k
1M
FREQUENCY (Hz)
INPUT
VOLTAGE
NOISE
(nV/
Hz)