Datasheet

MAX9924–MAX9927
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
4 _______________________________________________________________________________________
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
EXT
Mode B, T
A
= +125°C 1.5
V
CC
- 1.1
EXT Voltage Range V
EXT
Mode C, T
A
= +125°C 0.14
V
CC
- 1.1
V
Input Current to EXT I
EXT
Mode B, V
EXT
> V
BIAS
; and Mode C 10 µA
DIRN (MAX9926 Only)
Output Low Voltage 0.2 V
INT_THRS, ZERO_EN
Low Input V
IL
0.3 x
V
CC
V
High Input V
IH
0.7 x
V
CC
V
Input Leakage I
LEAK
1µA
Input Current ZERO_EN I
SINK
Pullup resistor = 10kΩ,
V
ZERO_EN
= V
GND
500 800 µA
Switching Time Between Modes
A1, A2, and Modes B, C
t
SW
With INT_THRS = GND, auto peak-
detect is disabled, and EXT_THRS is
active
3µs
BIAS
Input Current to BIAS I
BIAS
Modes A1, A2, B, C 1 µA
Modes A1, B, T
A
= +125°C 1.5
V
CC
- 1.1
BIAS Voltage Range V
BIAS
Mode C, T
A
= +125°C 0.2
V
CC
- 1.1
V
Internal BIAS Reference Voltage V
INT_BIAS
Mode A2 (MAX9924/MAX9926) 2.46 V
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, V
GND
= 0V, MAX9925/MAX9927 gain setting = 1V/V, Mode A1, V
BIAS
= 2.5V, V
PULLUP
= 5V, R
PULLUP
= 1kΩ, C
COUT
=
50pF. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
Note 2: Specifications are 100% tested at T
A
= +125°C, unless otherwise noted. All temperature limits are guaranteed by design.
Note 3: Inferred from functional PSRR.
Note 4: CMOS inputs.
Note 5: Guaranteed by design.
Note 6: Includes effect of V
OS
of internal op amp and comparator.