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參數(shù)資料
| 型號： | AD22057N |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | RD Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 12V; Power: 2W; Low Cost 2W Dual Output Converter; Industry Standard SIP7 and DIP14 Packages; Power Sharing on Outputs; Optional Continuous Short Circuit Protected; 1kVDC & 2kVDC Isolation Options; UL94V-0 Package Material; Efficiency to 86% |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 1000 uV OFFSET-MAX, 0.03 MHz BAND WIDTH, PDIP8 |
| 封裝： | MINI, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 192K |
| 代理商： | AD22057N |
AD22057
–6–
REV. A
T o 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. T here is
sufficient headroom to allow at least a 10% overrange (to +4.4 V).
T he 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 f
C
= 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 f
C
= 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 GND A1
+IN
OFS +V
S
OUT
A2
100m
V
SOLENOID
LOAD
POWER
DARLINGTON
CMOS DRIVER
+V
S
(BATTERY)
CHASSIS
C
432k
V
50k
V
+5V
ANALOG
OUTPUT
CORNER FREQUENCY
= 1Hz-
m
F
(0.05
m
F FOR f
C
= 20Hz)
ANALOG
COMMON
FLYBACK
DIODE
127k
V
C
Figure 11. Illustration of Two-Pole Low-Pass Filtering
ST RAIN GAGE INT E RFACE : MIDSCALE OFFSE T
FE AT URE
T he 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 GND A1
+IN
OFS +V
S
OUT
A2
R
L
10k
V
+V
S
ANALOG OUTPUT
ANALOG COMMON
100k
V
OS
NULL
OPTIONAL
LP FILTER
125k
V
(SETS GAIN
TO
3
100)
V
G
R
R
R
R
Figure 12. Typical Connections for a Strain Gage Interface
Using the Offset Feature
T he 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. T he 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 (V
G
) 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). T his 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 V
OS
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
V
95k
V
+V
S
20k
V
OFS
OUT
20k
V
R
L
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 V
OFS
/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.
T he relationship is described by:
V
OUT
>
1
2
V
OFS
R
L
R
L
+
20
k
*
*T his 20 k
resistor is internal to the AD22057 and can vary by
±
30%.
where R
L
is an externally applied load resistor. However, R
L
cannot be made arbitrarily small since this would require exces-
sive current from the output. T he output current should be
limited to 5 mA total.
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| AD22100AR | RD Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 15V; Power: 2W; Low Cost 2W Dual Output Converter; Industry Standard SIP7 and DIP14 Packages; Power Sharing on Outputs; Optional Continuous Short Circuit Protected; 1kVDC & 2kVDC Isolation Options; UL94V-0 Package Material; Efficiency to 86% |
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| AD22057R-REEL | 功能描述:IC AMP DIFF SNGL-SUP 8SOIC T/R RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| AD22057RZ | 功能描述:IC AMP DIFF SINGLE-SUPPLY 8-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| AD22057RZ-RL | 功能描述:IC AMP DIFF SNGL-SUP 8SOIC T/R RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| AD220S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Fast Asymmetric Thyristors |
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