Datasheet

MAX9924–MAX9927
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
CC
= 5V, V
GND
= 0V, MAX9925/MAX9927 gain setting = 1V/V. All values are at T
A
= +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)
V
CM
= 2.5V
f
IN
= 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
V
CM
= 0 TO 5V
INPUT SIGNAL vs. COUT WITH
WATCHDOG TIMER EXPIRED
MAX9924 toc12
20ms/div
V
BIAS
5V
f
IN
= 5Hz
COUT
INPUT SIGNAL
INPUT SIGNAL vs. COUT WITH
WATCHDOG TIMER EXPIRED
MAX9924 toc13
100μs/div
V
BIAS
5V
f
IN
= 1kHz
COUT
INPUT SIGNAL
833mV
MAX9924 toc14
100
μ
s/div
OVERDRIVEN INPUT VOLTAGES
(MAX9924)
MAX9924 toc15
200μs/div
DIRN OPERATION
(MAX9924)
MAX9924 toc16
INPUT REFERRED NOISE DENSITY
vs. FREQUENCY
10
20
60
40
80
100
10 1k100 10k 100k 1M
FREQUENCY (Hz)
INPUT VOLTAGE NOISE (nV/ Hz)