AMR4020 MULTIDIMENSION | Alldatasheet
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Technical content
High Accuracy Analog Magnetic Scale Sensor AMR4020, AMR4050 Phase A (V1+) - (V1-) Phase B (V2+) - (V2-)
Description
The AMR40X 0 series magnetic grate sensors integrate two push-pull Wheatstone bridges, each of which contains four high-sensitivity anisotropic magnetoresistance (AMR) sensing elements. Such a design effectively compensates temperature drift to ensure high accuracy under wide temperature range. As the AMR40X 0 moves along the magnetic scale, sensor outputs two orthogonal sets of analog voltage signals (sine and cosine), the period of which corresponds to the scale’s magnetic pole pitch. The relative displacement of the sensor and the scale can be accurately determined by calculating the two sets of analog voltage signals. The AMR40X0 series have been designed with internal sensor elements close to the surface of the package to reduce limitations on airgap. Combined with the already small DFN12L (6 mm × 2 mm × 0.75 mm) package, the AMR40 X0 series give greater responsibility to system design and ease of assembly in tight spaces. Features and benefits
- Anisotropic magnetoresistance (AMR) technology
- Wide range supply voltages
- Large airgap tolerance
- Low saturation field
- Phase A and phase B analog output
- Excellent temperature stability
- High tolerance to external magnetic field interference
- RoHS & REACH compliant
Applications
- Incremental or absolute encoder
- Linear or angular displacement encoder
- Magnetic scale and magnetic encoder DFN12L Datasheet MultiDimension Technology Co., Ltd. http://www.dowaytech.com/en/ Version 2.0.1
Part Number Magnetic Pole Pitch Output Channel Operating Ambient Temperature Package Packing Form AMR4020D 2 mm 2 -40 °C to 125 °C DFN12L Tape & Reel AMR4050D 5 mm 2 -40 °C to 125 °C DFN12L Tape & Reel Catalogue AMR40x0 MultiDimension Technology Co., Ltd. http://www.dowaytech.com/en/ High Accuracy Analog Magnetic Scale Sensor
Table 1. The AMR4020D pin configuration
1 NA -
2 V2- Phase B signal negative output
3 V1- Phase A signal negative output
4 GND Ground
5 VCC Power supply
6 V2+ Phase B signal positive output
7 V1+ Phase A signal positive output
8 NA -
9 NA [1]
10 NA -
11 NA -
12 NA [1]
Note: Pin 9, pin 12 and EP are connected inside the sensor. Table 2. The AMR4050D pin configuration
1 VCC2 Phase B power supply
5 VCC1 Phase A power supply
6 V1+ Phase A signal positive output
7 V2+ Phase B signal positive output
MultiDimension Technology Co., Ltd.
- Absolute Maximum Ratings Parameters Symbol Min. Max. Unit Applicable Part Number Supply voltage VCC -9 9 V All parts Magnetic flux density B - 1500 Gs All parts Operating ambient temperature TA -40 125 °C All parts Storage ambient temperature TSTG -40 150 °C All parts 5. Electrical Specifications VCC = 5 V, TA = 25 °C, a 0.1 μF capacitor is connected between VCC and GND Parameter Symbol Condition Min. Typ. Max. Unit Applicable Part Number Supply voltage VCC Operating - 5 9 V All parts Bridge resistance RB B = 0 Gs, TA = 25 °C - 2.8 - kΩ AMR4020D - 2.4 - kΩ AMR4050D Temperature coefficient of bridge resistance 3) TCRB T1 = -40 °C, T2 = +125 °C - 0.23 - %/°C All parts Output amplitude VPEAK VCC = 5 V, TA = 25 °C 9 11 13 mV/V All parts Temperature coefficient of output amplitude 5) TCVPEAK T1 = -40 °C, T2 = +125 °C - -0.4 - %/°C All parts Offset VOFFSET VCC = 5 V, TA = 25 °C -1 0 +1 mV/V All parts Temperature coefficient of offset 7) TCO T1 = -40 °C, T2 = +125 °C -5 0 +5 μV/V/°C All parts Note: 1 Gauss in air = 0.1 millitesla = 79.8 A/m1) RB (T2) - RB (T1) VPEAK (T2) - VPEAK (T1) VOFF (T2) - VOFF (T1)7) TCO TCVPEAK = T2 - T1 TCRB VPEAK VOFFSET = × 100% 2) Resistance between V1+ and V1-. Resistance between V2+ and V2-. Resistances can be customized upon request. 3) RB (T1) × (T2-T1) 4) VMAX - VMIN VMAX + VMIN 26) = V2MAX V2MIN Output voltage (V) Displacement (mm) AMR40x0 MultiDimension Technology Co., Ltd. http://www.dowaytech.com/en/ High Accuracy Analog Magnetic Scale Sensor
6.1 Application and Output Voltage Amplitude
Figure 5. Operational amplifier that converts signal from single channel differential output signal
6.2 Installation Requirements and Measurement Accuracy
field at sensor surface ≥ 200 Gs). Figure 6. Relative position of the AMR40X0 and magnetic scale accuracy of 10 μm to 50 μm is a realistic goal for system design. MultiDimension Technology Co., Ltd.
Figure 7. DFN12L package outline of AMR4020 (unit: mm) MultiDimension Technology Co., Ltd.
Figure 8. DFN12L package outline of AMR4050 (unit: mm) MultiDimension Technology Co., Ltd.
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