|
|
PDF MM1089 Data sheet ( Hoja de datos )
| Número de pieza | MM1089 | |
| Descripción | Sensor Amplifier | |
| Fabricantes | Mitsumi Electric | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MM1089 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
|
No Preview Available !
MITSUMI
Sensor Amplifier
Monolithic IC MM1089
Sensor Amplifier MM1089
Outline
This IC is an amplifier with a high-impedance differential input, which can be used in high-CMR instrumentation.
Particularly when amplifying signals from a high-impedance or high-bias signal source, often signals are buried
in noise, making amplification difficult. This IC amplifies only the signal, and the noise is suppressed rather than
amplified, making it effective for use where noise is prominent or with high-impedance signal sources.
Features
1. Battery charge/discharge current detection
(for laptops, word processors, etc)
2. Signal amplifiers for magnetic sensors, pressure sensors, strain gauges
3. Instrumentation amps
4. Broad input range
5. Two internal channels
80dB min., 100dB typ.
Except 10MΩ
3~ 100
-0.3V~VCC+0.3V
Package
SOP-18A (MM1089XF)
Applications
1 Detection of battery charge/discharge current (for notebook computers, word processors etc)
2 Amplification of magnetic sensor, pressure sensor, strain gauge, other signals
3 Instrumentation amp
1 page  
MITSUMI
Sensor Amplifier MM1089
Gain Settings
1. By mounting appropriate external Rs and Rg resistances, a subtractive amp can easily be configured with a
gain Gv=K RS/Rg (where K=1 typ.).
Here the precision of RS and Rg affects the gain, but has no inherent effect on CMR.
However, the practical range for the gain is Gv=3 to 100.
2. To determine RS and Rg, first RS is calculated from the maximum required output voltage; then the
equation for the gain Gv=K RS/Rg is used to compute Rg.
The voltage gain coefficient K varies with the value of Rg. For approximate values of K see Fig.1. The larger
the value of RS, the larger is the output offset voltage.
If RS is made small, an advantageous offset voltage is obtained, but if it is too small, an adequate maximum
output voltage is not obtained.
As a rough estimate, when the maximum output voltage is to be 10VP-P, Rs=1000kΩ; if it is to be 5VP-P,
then Rs=500kΩ.
Recommended values: When Rs=1000 kΩ, Gv=100, Rg=9.1kΩ
When Rs=1000 kΩ, Gv=50, Rg=18kΩ
When Rs=500kΩ, Gv=50, Rg=9.1kΩ
When Rs=500kΩ, Gv=10, Rg=47kΩ
3. The output offset voltage ratings in the table of electrical characteristics are for Rg=10kΩ, Rs=1000kΩ.
When using other constants, use the following formula for the output offset:
Output offset=VIO GV+IOO RS
4. The output voltage is essentially the voltage applied to the O.COM (OUTPUT COMMON) pin, output as the
reference level. In actuality, an offset is added to the reference potential and output.
Because the O.COM pin is independent of both amps 1 and 2, offset adjustment is easily accomplished by
shifting the O.COM pin voltage by the amount of the offset.
5. If the input range switching pin is set high, the input voltage range is covered from the VCC level; by
switching it to low, the range extends from GND level.
However, the offsets are different, so care must be taken in continuous switching.
6. The O.COM pin setting voltage range and common-mode input range should be set to voltages between
the minimum and maximum values.
[Voltage gain coefficient K vs. Rg]
1.00
0.98
0.96
0.94
0.92
0.90
0.88
0.86
0.84
100
101 102
Fig. 1 Rg (kΩ)
103
MM1089
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MM1089.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MM1080 | (MM1xxx) System Reset | Mitsumi Electric |
| MM1081 | (MM1027 / MM1081) System Reset | Mitsumi Electric |
| MM1089 | Sensor Amplifier | Mitsumi Electric |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |