am8192b RLS, am8192b Datasheet - Page 6

• Manufacturer Part Number: am8192b
• Description: Angular Magnetic Encoder Ic
• Manufacturer: RLS

Data sheet
AM8192BD01_05
Issue 5, 14
CW rotation and zero position of the magnet
The arrow in Fig. 3 shows clockwise (CW) rotation of the magnet. The picture is a top view of the magnet
placed above the AM8192B. CCW is counter clockwise rotation. Fig. 4 shows a rotational zero position of the
magnet regarding to the chip. The picture is a top view of the magnet placed above the AM8192B.
Sinusoidal analogue output for monitoring
Vref is an internally generated reference voltage. It is used as a zero level for the analogue signals. The Vref
voltage is 1/2 of V
with a high impedance load. They can be used for filtering and they can be used for monitoring the signals.
Unbuffered sinusoidal outputs:
* When signal level is 1 V and connected to Vref
Fig. 5 shows the timing diagram for CW rotation of
the recommended magnet.
Sinusoidal outputs produce one period of sine and
cosine signal per turn with phase difference of 90°.
Each signal has the same amplitude and minimum
offset with respect to Vref.
Sinusoidal output parameters are factory optimized
to achieve the best possible accuracy. The
optimization is done according to the accuracy of
the digital output to eliminate small additional
errors from the interpolator. However, the specified
accuracy parameters are only valid for magnets
specified and used within alignment tolerances.
When a load is applied to the analogue outputs,
the amplitude is slightly reduced. The load must be
connected between signal pins and Vref. The load
must be the same for both channels to preserve
symmetry.
The AM8192B signal amplitude can vary from chip to chip within the same batch and at equal conditions with
a standard deviation of 20 mV.
Sinusoidal signal parameters:
* Amplitude = 1/2 of peak to peak value. The power supply voltage, the distance to the magnet and temperature are within
** Rotation of the magnet defines the frequency. The maximum frequency depends on filtering and interpolator settings.
© 2009 RLS d.o.o.
Parameter
Internal serial impedance
Short Circuit current
Parameter
Amplitude
Vref voltage
Max. frequency
tolerances. The amplitude must never exceed 1.5 V to prevent saturation of the signals.
th
January 2009
dd
Symbol
A
V
f
. Pins 3 and 4 are unbuffered sinusoidal analogue outputs and they must only be used
Max
Vref
Fig. 3: CW rotation
Symbol
R
I
0
Min.
0.5
n
Typ.
1.04
V
1000
dd
Min.
8.5
/2
Max.
1.4
Typ.
10
100
Max.
11.5
Unit
V
V
Hz
A
5
4
3
2
1
0
0
Note
*
**
Unit
kΩ
µA
Fig. 5: Timing diagram for analogue output
Fig. 4: Zero position
Note
*
90
associate company
Magnet rotation [°]
Sine
Cosine
180
A
270
Vref
6
360