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參數(shù)資料
| 型號(hào)： | AD694ARZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TRANSMITTER 4-20MA 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
| 其它名稱： | AD694ARZ-REELDKR |
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AD694
–8–
REV. B
Figure 6 will give an approximately linear adjustment of the
4 mA offset within fixed limits. To find the proper resistor val-
ues, first select X, the desired range of adjustment as a fraction
of 4 mA. Substitute this value in the appropriate formula below
along with the chosen reference output voltage (VREF = 2 V or
10 V usually), to determine the resistor values required.
RP = 180
(1/X – 4.5)
RF = 500
[(V
REF / 1.22 V) – 0.18 – 0.82X][1/X – 4.5]
These formulae take into account the
±10% internal resistor
tolerance and ensure a minimum adjustment range for the 4 mA
offset. For example, assume the 2 V reference option has been
selected. Choosing X = 0.05, gives an adjustment range of
±5%
of the 4 mA offset.
RP = 180
(1/0.05 – 4.5) = 2.79 k
RF = 500
[(2 V / 1.22) – 0.18 – 0.82 × 0.05][1/0.05 – 4.5]
= 10.99 k
These can be rounded down to more convenient values of
2.5 k
and 9.76 k. In general, if the value of RP is rounded
down slightly, the value of RF should be rounded down propor-
tionately, and vice versa. This helps to keep the adjustment
range symmetrical.
Figure 6. Optional 4 mA Zero Adjustment
ADJUSTING SPAN FOR 10 V FS
When the AD694 is configured with a 10 V input full-scale the
span maybe adjusted using the network shown in Figure 7. This
scheme allows an approximately linear adjustment of the span
above or below the nominal value. The span adjustment does
not interact with the 4 mA offset. To select RS and RT, choose
Figure 7. Span Adjustment, 10 V Full Scale
X, the desired adjustment range as a fraction of the span. Sub-
stitute this value in the appropriate formula below.
RT = 1.8 k
((1 – X)/X)
RS = 9 k
[1 – 0.2 (1 + X)( 1 – X )] / 2X
These formulae take into account the
±10% absolute resistor
tolerance of the internal span resistors and ensure a minimum
adjustment range of the span. For example, choosing the adjust-
ment range to be
±2%, or 0.02 gives:
RT = 1.8 k
((1 – 0.02) / 0.02) = 88.2 k.
RS = 9 k
[1 – 0.2 (1 + 0.02)( 1 – 0.02 )] / (2 × 0.02) =
175.5 k
These values can be rounded up to the more convenient values
of 100 k
and 198 k. In general, if RT is rounded up, then the
value of RS should be rounded up proportionally, and vice versa.
ADJUSTING SPAN FOR 2 V FS
The precalibrated 2 V full-scale range requires a different ad-
justment scheme due to the single supply nature of the AD694.
Figure 8 shows an adjustment scheme that allows an approxi-
mately linear adjustment of the 2 V span plus or minus the
nominal value. The span adjustment does not affect the value of
the 4 mA offset current.
To find the proper resistor values first select X, the desired
range of adjustment as a fraction of the output span. Substitute
this value into the following formulae:
RA = 2
× X × RB where RB is greater than 5 K
RC = (2.75 k
× X)/(1 – 0.275X)
These formulae take into account the
±10% absolute tolerance
of the internal span resistors and ensure a minimum adjustment
range.
For example, choosing the adjustment range to be
±320 A of
FS or,
±2%, let X = 0.02. Thus:
Setting RB = 10 K, then RA = 2(.02)
× 10 k = 400
RC = (2.75 k
× 0.02)/ (1 – 0.275 × (0.02)) = 55.3
The value of RC can be rounded to the more convenient value of
49.9
. In general, if RA is rounded up, then RC should be
rounded up proportionally, and vice versa; rounding up will in-
crease the range of adjustment.
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| AD694BQ | 功能描述:IC TRANSMITTER 4-20MA 16-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 |
| AD694BR | 制造商:Analog Devices 功能描述:IC TRANSMITTER 4-20MA |
| AD694BR-REEL | 制造商:Analog Devices 功能描述:SP Amp INSTR Amp Single 36V 16-Pin SOIC W T/R |
| AD694BR-REEL7 | 制造商:Analog Devices 功能描述:SP Amp INSTR Amp Single 36V 16-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD694BRZ | 功能描述:IC TRANSMITTER 4-20MA 16-SOIC RoHS:是 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 |
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