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PDF MAX9924 Data sheet ( Hoja de datos )
| Número de pieza | MAX9924 | |
| Descripción | (MAX9924 - MAX9927) Variable Reluctance Sensor Interfaces | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX9924 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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19-4283; Rev 0; 10/08
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
www.datasheet4u.com
General Description
The MAX9924–MAX9927 variable reluctance (VR or mag-
netic coil) sensor interface devices are ideal for position
and speed sensing for automotive crankshafts,
camshafts, transmission shafts, etc. These devices inte-
grate a precision amplifier and comparator with selectable
adaptive peak threshold and zero-crossing circuit blocks
that generate robust output pulses even in the presence
of substantial system noise or extremely weak VR signals.
The MAX9926/MAX9927 are dual versions of the
MAX9924/MAX9925, respectively. The MAX9924/
MAX9926 combine matched resistors with a CMOS input
precision operational amplifier to give high CMRR over a
wide range of input frequencies and temperatures. The
MAX9924/MAX9926 differential amplifiers provide a fixed
gain of 1V/V. The MAX9925/MAX9927 make all three ter-
minals of the internal operational amplifier available,
allowing greater flexibility for gain. The MAX9926 also
provides a direction output that is useful for quadrature-
connected VR sensors that are used in certain high-per-
formance engines. These devices interface with both
new-generation differential VR sensors as well as legacy
single-ended VR sensors.
The MAX9924/MAX9925 are available in the 10-pin
µMAX® package, while the MAX9926/MAX9927 are
available in the 16-pin QSOP package. All devices are
specified over the -40°C to +125°C automotive temper-
ature range.
Applications
Camshaft VRS Interfaces
Crankshaft VRS Interfaces
Vehicle Speed VRS Interfaces
Features
♦ Differential Input Stage Provides Enhanced Noise
Immunity
♦ Precision Amplifier and Comparator Allows
Small-Signal Detection
♦ User-Enabled Internal Adaptive Peak Threshold or
Flexible External Threshold
♦ Zero-Crossing Detection Provides Accurate
Phase Information
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9924UAUB+
-40°C to +125°C
10 µMAX
MAX9925AUB+
-40°C to +125°C
10 µMAX
MAX9926UAEE+* -40°C to +125°C
16 QSOP
MAX9927AEE+*
-40°C to +125°C
16 QSOP
+Denotes a lead-free/RoHS-compliant package.
*Future product—contact factory for availability.
Selector Guide
PART
MAX9924UAUB
MAX9925AUB
MAX9926UAEE
MAX9927AEE
AMPLIFIER
1 x Differential
1 x Operational
2 x Differential
2 x Operational
GAIN
1V/V
Externally Set
1V/V
Externally Set
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Simplified Block Diagram
ENGINE BLOCK
VR SENSOR
DIFFERENTIAL
AMPLIFIER
MAX9924
ADAPTIVE/MINIMUM
AND
ZERO-CROSSING
THRESHOLDS
INTERNAL/EXTERNAL
BIAS VOLTAGE
μC
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
www.datasheet4u.com
Typical Operating Characteristics
(VCC = 5V, VGND = 0, MAX9925/MAX9927 gain setting = 1V/V. All values are at TA = +25°C, unless otherwise noted.)
INPUT OFFSET VOLTAGE DISTRIBUTION
20
VCM = 0
BIN SIZE = 250
15
10
5
0
-2000 -1000
0 1000 2000 3000
-1500 -500 500 1500 2500
INPUT OFFSET VOLTAGE (μV)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
-10 VRIPPLE = 100mVP-P
-20
VBIAS = VOUT = 2.5V
INPUTS COUPLED TO GND
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
1
10 100 1k 10k 100k
FREQUENCY (Hz)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
0.6
VOUT = 2.5V
MAX9925
0.5
0.4
0.3
VCM = 2.5V
0.2
VCM = 0
0.1
0
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE
0.5
0.4
0.3
0.2
0.1
0
-0.5
VOUT = 2.5V
MAX9925
0.5 1.5 2.5 3.5 4.5 5.5
INPUT COMMON-MODE VOLTAGE (V)
OPEN LOOP FREQUENCY
RESPONSE
125
VCC = 5V
VBIAS = 2.5V
100 VOUT = 2VP-P
MAX9925
75
50
25
0
0.001 0.1 10
FREQUENCY (kHz)
ADAPTIVE THRESHOLD AND RATIO
vs. SIGNAL LEVEL
900
800
700
600
500
400
300
200
100
0
0
fIN = 1kHz
MAX9924
0.5 1.0 1.5 2.0
SIGNAL LEVEL (VP)
2.5
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
120
100
80
60
40
20 VBIAS = VOUT = 2.5V
VCM = 2VP-P
CMRR = 20log(ADM/ACM)
0
1 10 100 1k
FREQUENCY (Hz)
10k
100k
VOL AND VOH vs. TEMPERATURE
40
35
30
25
VCC - VOH
20
15 VOL
10
5
0
-50
400
-25 0 25 50 75 100
TEMPERATURE (°C)
ADAPTIVE THRESHOLD
vs. TEMPERATURE
125
350
300
250
200
150
100
50
0
-50 -25
VIN = 2VP-P
fIN = 1kHz
MAX9924
0 25 50 75 100 125
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
www.datasheet4u.com
Functional Diagrams (continued)
OUT1
VCC
IN1-
VCC
IN1+
OP AMP
MAX9927
VCC
GND
COMPARATOR
85ms
WATCHDOG
COUT1
BIAS1
BUFFER
IN2-
IN2+
BIAS2
VCC
VCC
30%
PEAK
DETECTOR
VMIN
THRESHOLD
OP AMP
BUFFER
COMPARATOR
85ms
WATCHDOG
EXT1
OUT1
COUT2
30%
PEAK
DETECTOR
VMIN
THRESHOLD
MODE
LOGIC
INT_THRS1
INT_THRS2
EXT2
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAX9924.PDF ] | |
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