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| 型号： | AD22057R-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF SNGL-SUP 8SOIC T/R |
| 标准包装： | 2,500 |
| 类型： | 传感器接口 |
| 输入类型： | 电压 |
| 输出类型： | 模拟 |
| 接口： | 差分 |
| 电流 - 电源： | 200µA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
AD22057
–6–
REV. A
To produce a full-scale output of +4 V, a gain
×40 is used, adjust-
able by
±5% to absorb the tolerance in the sense resistor. There is
sufficient headroom to allow at least a 10% overrange (to +4.4 V).
The roughly triangular voltage across the sense resistor is aver-
aged by a single-pole low-pass filter, here set with a corner fre-
quency of fC = 3.6 Hz, which provides about 30 dB of attenuation
at 100 Hz. A higher rate of attenuation can be obtained by a
two-pole filter having fC = 20 Hz, as shown in Figure 11. Al-
though this circuit uses two separate capacitors, the total capaci-
tance is less than half that needed for the single-pole filter.
AD22057
+IN
OFS +VS OUT
–IN GND A1
A2
100m
SOLENOID
LOAD
POWER
DARLINGTON
CMOS DRIVER
+VS (BATTERY)
CHASSIS
C
432k
50k
+5V
ANALOG
OUTPUT
CORNER FREQUENCY
= 1Hz- F
(0.05 F FOR fC= 20Hz)
ANALOG
COMMON
FLYBACK
DIODE
127k
C
Figure 11. Illustration of Two-Pole Low-Pass Filtering
STRAIN GAGE INTERFACE: MIDSCALE OFFSET
FEATURE
The AD22057 can be used to interface a strain gage to a subse-
quent process where only a single supply voltage is available. In
this application, the midscale offset feature is valuable, since the
output of the bridge may have either polarity. Figure 12 shows
typical connections.
AD22057
+IN
OFS +VS OUT
–IN GND A1
A2
RL
10k
+VS
ANALOG OUTPUT
ANALOG COMMON
100k
VOS NULL
OPTIONAL
LP FILTER
125k
(SETS GAIN
TO
100)
VG
R
Figure 12. Typical Connections for a Strain Gage Interface
Using the Offset Feature
The offset is obtained by connecting Pin 7 (OFS) to the supply
voltage. In this way, the output of the AD22057 is centered to
midway between the supply and ground. In many systems the
supply will also serve as the reference voltage for a subsequent
A/D converter. Alternatively, Pin 7 may be tied to the reference
voltage from an independent source. The AD22057 is trimmed
to guarantee an accuracy of
±2% on the 0.5 ratio between the
voltage on Pin 7 and the output.
An ac excitation of up to
±2 V can also be used because the
common-mode range of the AD22057 extends to –1 V. Assum-
ing a full-scale bridge output (VG) of ± 10 mV, a gain of ×100
might be used to provide an output of
±1 V (a full-scale range
of +1.5 V to +3.5 V). This gain is achieved using the method
discussed in connection with Figure 5. Note that the gain-
setting resistor does not affect the accuracy of the midscale
offset. (However, if the gain were lowered, using a resistor to
ground, this offset would no longer be accurate.) A VOS nulling
pot is included for illustrative purposes. One-, two- and three-
pole filtering can also be implemented, as discussed in the
Low-Pass Filtering section.
Using the Midscale Offset Feature
Figure 13 shows a more detailed schematic of the output am-
plifier A2. Because this is a single supply device, the output
stage has no pull-down transistor. Such a transistor would limit
the minimum output to several hundred millivolts above
ground. When using the AD22057 in unipolar mode (Pin 7
grounded), the resistors making up the feedback network also
act as a pull-down for the output stage.
A2
10k
95k
+VS
20k
OFS
OUT
20k
RL
GND
Figure 13. Detailed Schematic of Output Amplifier A2
If the output is called upon to source current (not sink), then it
can swing almost completely to ground (within 20 mV). How-
ever, if the offset pin is connected to some positive voltage
source, this source will “pull up” the output voltage, thereby
limiting the minimum output swing. With no external load the
minimum output voltage possible is VOFS/2. For example, if Pin
7 is connected to +5 V, the minimum output voltage is equal
to the offset voltage of 2.5 V. By adding an additional load, as
shown, the output swing toward ground can be extended.
The relationship is described by:
VOUT >
1
2
VOFS
RL
RL + 20 k *
*This 20 k
resistor is internal to the AD22057 and can vary by ±30%.
where RL is an externally applied load resistor. However, RL
cannot be made arbitrarily small since this would require exces-
sive current from the output. The output current should be
limited to 5 mA total.
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