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參數(shù)資料
| 型號(hào)： | AD693AD |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SGNL COND 4-20MA TX 20-CDIP |
| 標(biāo)準(zhǔn)包裝： | 19 |
| 類型： | 信號(hào)調(diào)節(jié)器 |
| 輸入類型： | 電壓 |
| 輸出類型： | 電壓 |
| 接口： | 3 線 |
| 電流 - 電源： | 20mA |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 20-CDIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 20-CDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 798 (CN2011-ZH PDF) |
AD693
REV. A
–7–
Figure 11. Using an External Pass Transistor to Minimize Self-Heating Errors
of adjustment of the output current from nominal. Substitute
this value in the appropriate formula below for adjustment at the
4 mA tap.
RZ1 = (1.6 V/IA) – 400 and
RZ2 = RZ1 × 3.1 V/(15 mV + IA × 3.75 )
Use a similar connection with the following resistances for
adjustments at the 12 mA tap.
RZ1 = (4.8 V/IA) – 400
and
RZ2 = RZ1
× 3.1 V/(45 mV + I
A
× 3.75 )
These formulae take into account the
±10% tolerance of tap
resistance and insure a minimum adjustment range of IA. For
example, choosing IA = 200 A will give a zero adjustment range
of
±1% of the 20 mA full-scale output. At the 4 mA tap the
maximum value of:
RZ1 = 1.6 V/200
A – 400 = 7.6 k and
RZ2 = 7.6 k
× 3.1 V/(15 mV + 200 A × 3.75 ) = 1.49 M
Figure 12. Optional 4 mA Zero Adjustment (12 mA Trim
Available Also)
These can be rounded down to more convenient values of
7.5 k
and 1.3 M, which will result in an adjustment range
comfortably greater than
±200 A.
ADJUSTING INPUT SPAN
Input Span is adjusted by changing the gain of the Signal
Amplifier. This amplifier provides a 0-to-60 mV signal to the
V/I section to produce the 4-to-20 mA output span (or a
0-to-75 mV signal in the 0-to-20 mA mode). The gain of this
amplifier is trimmed to 2.00 so that an input signal ranging from
0-to-30 mV will drive the V/I section to produce 4-to -20 mA.
Joining P1 and P2 (Pins 15 and 16) will reduce the Signal Ampli-
fier gain to one, thereby requiring a 60 mV signal to drive the V/I
to a full 20 mA span.
To produce spans less than 30 mV, an external resistor, RS1, can
be connected between P1 and 6.2 V. The nominal value is given
by:
R
S1 =
400
30 mV
S
1
where S is the desired span. For example, to change the span to
6 mV a value of:
R
S1 =
400
30 mV
6 mV
1
= 100
is required. Since the internal, 800
gain setting resistors
exhibit an absolute tolerance of 10%, RS1 should be provided
with up to
±10% range of adjustment if the span must be well
controlled.
For spans between 30 mV and 60 mV a resistor RS2 should be
connected between P1 and P2. The nominal value is given by:
RS2 =
400
1
60 mV
S
30 mV
S
1
For example, to change the span to 40 mV, a value of:
R
S2 =
400
1
60 mV
40 mV
30 mV
40 mV
1
= 800
is required. Remember that this is a nominal value and may
require adjustment up to
±10%. In many applications the span
must be adjusted to accommodate individual variations in the
sensor as well as the AD693. The span changing resistor should,
therefore, include enough adjustment range to handle both the
sensor uncertainty and the absolute resistance tolerance of P1
and P2. Note that the temperature coefficient of the internal
resistors is nominally –17 ppm/
°C, and that the external
resistors should be comparably stable to insure good tempera-
ture performance.
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| AD693AE | 功能描述:IC SGNL COND 4-20MA TX 20-CLCC RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)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 |
| AD693AQ | 功能描述:IC TRANSMITTER 4-20MA 20-CDIP RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)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 |
| AD693BQ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Loop-Powered 4a??20 mA Sensor Transmitter |
| AD694 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4.20 mA Transmitter |
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