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参数资料
| 型号： | ADM209 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | +5 V Powered CMOS RS-232 Drivers/Receivers(CMOS RS-232驱动器/接收器) |
| 中文描述： | 5伏的CMOS技术的RS - 232驱动器/接收（的CMOS的RS - 232驱动器/接收器） |
| 文件页数： | 7/12页 |
| 文件大小： | 224K |
| 代理商： | ADM209 |
3209
AND
3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
www.allegromicro.com
7
FUNCTIONAL DESCRIPTION
Low Average Power.
Internal timing circuitry activates the
sensor for 60
μ
s and deactivates it for the remainder of the
period (480
μ
s for the A3209Ex and 60 ms for the A3210Ex).
A short "awake" time allows for stabilization prior to the sensor
sampling and data latching on the falling edge of the timing
pulse. The output during the "sleep" time is latched in the last
sampled state. The supply current is not affected by the output
state.
Chopper-Stabilized Technique.
The Hall element can be
considered as a resistor array similar to a Wheatstone bridge. A
large portion of the offset is a result of the mismatching of these
resistors. These devices use a proprietary dynamic offset
cancellation technique, with an internal high-frequency clock to
reduce the residual offset voltage of the Hall element that is
normally caused by device overmolding, temperature dependen-
cies, and thermal stress. The chopper-stabilizing technique
cancels the mismatching of the resistor circuit by changing the
direction of the current flowing through the Hall plate using
CMOS switches and Hall voltage measurement taps, while
maintaing the Hall-voltage signal that is induced by the external
magnetic flux. The signal is then captured by a sample-and-
hold circuit and further processed using low-offset bipolar
circuitry. This technique produces devices that have an
extremely stable quiescent Hall output voltage, are immune to
thermal stress, and have precise recoverability after temperature
cycling. This technique will also slightly degrade the device
output repeatability. A relatively high sampling frequency is
used in order that faster signals can be processed.
More detailed descriptions of the circuit operation can be
found in: Technical Paper STP 97-10,
Monolithic Magnetic
Hall Sensor Using Dynamic Quadrature Offset Cancellation
and Technical Paper STP 99-1,
Chopper-Stabilized Amplifiers
With A Track-and-Hold Signal Demodulator
.
Dwg. WH-017-1
0
PERIOD
60
μ
s - "AWAKE"
"SLEEP"
I
DD(EN)
I
DD(DIS)
SAMPLE &
OUTPUT LATCHED
Dwg. EH-012-1
S
&
X
+V
+V
HALL
VOLTAGE
B
+
—
Dwg. AH-011-2
Operation.
The output of this device switches low (turns on)
when a magnetic field perpendicular to the Hall sensor exceeds
the operate point B
OPS
(or is less than B
OPN
). After turn-on, the
output is capable of sinking up to 1 mA and the output voltage
is V
OUT(ON)
. When the magnetic field is reduced below the
release point B
RPS
(or increased above B
RPN
), the device output
switches high (turns off). The difference in the magnetic
operate and release points is the hysteresis (B
hys
) of the device.
This built-in hysteresis allows clean switching of the output
even in the presence of external mechanical vibration and
electrical noise.
As used here, negative flux densities are defined as less
than zero (algebraic convention) and -50 G is less than +10 G.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM209AN | 制造商:Analog Devices 功能描述:Triple Transmitter Quint Receiver RS-232 24-Pin PDIP 制造商:Analog Devices 功能描述:LINE TRANSMITTER/RCVR 3TR 3TX 5RX 24PDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:O.1UF LINE DRIVER - I.C. - Bulk |
| ADM209ANZ | 制造商:Analog Devices 功能描述:Triple Transmitter Quint Receiver RS-232 24-Pin PDIP 制造商:Analog Devices 功能描述:LINE TRANSMITTER/RCVR 3TR 3TX 5RX 24PDIP - Rail/Tube |
| ADM209AR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADM209AR-REEL | 制造商:Analog Devices 功能描述:Triple Transmitter Quint Receiver RS-232 24-Pin SOIC W T/R 制造商:Analog Devices 功能描述:LINE TRANSMITTER/RCVR 3TR 3TX 5RX 24SOIC W - Tape and Reel |
| ADM209ARS | 制造商:Analog Devices 功能描述:Triple Transmitter Quint Receiver RS-232 24-Pin SSOP 制造商:Analog Devices 功能描述:LINE TRANSMITTER/RCVR 3TR 3TX 5RX 24SSOP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:O.1UF LINE DRIVER - I.C. - Bulk |
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