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參數(shù)資料
| 型號： | ZN427J8DC |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 中文描述： | 250 的低電流運(yùn)算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大?。?/td> | 311K |
| 代理商： | ZN427J8DC |
ZN427
11
1
R
2
UNIPOLAR OPERATION
The general connection for unipolar operation is shown in
Fig.14.
The values of R
and R
2
are chosen so that V
IN
= V
REF
IN when
the analogue input (A
IN
) is at full-scale.
The resulting full-scale range is given by:
A
IN
FS = 1 + R
REF
IN = G.V
REF
IN.
To match the ladder resistance R
1
/R
2
(R
IN
) = 4k
.
The required nominal values of R
1
and R
2
are given by
R
1
= 4Gk, R
= 4G k
G-1
Fig.14 Unipolar operation - general connection
R1
R2
680k
1M
ZERO
ADJUST
GROUND
7
9
6
ZN427
VIN
AIN
VREF IN
1
and
R
2
can be constructed for V
REF
IN = 2.5V.
Gain adjustment
Due to tolerance in R
and R
, tolerance in V
and the gain
(full-scale) error of the DAC, some adjustment should be
incorporated into R
to calibrate the full-scale of the converter.
When used with the internal reference and 2% resistors a
preset capable of adjusting R
1
by at least
±
5% of its nominal
value is suggested.
R
2
8k
5.33k
R
1
8k
16k
G
2
4
Input range
+5V
+10V
Zero adjustment
Due to offsets in the DAC and comparator the zero (0 to 1)
code transition would occur with typically 15mV applied to the
comparator input, which correpsonds to 1.5LSB with a 2.56V
reference.
Zero adjustment must therefore be provided to set the zero
transition to its correct value of +0.5LSB or 5mV with a 2.56V
reference. This is achieved by applying an adjustable positive
offset to the comparator input via P2 and R3. The values
shown are suitable for all input ranges greater than 1.5 times
V
REF
IN.
Practical circuit values for +5 and +10V input ranges are given
in Fig.15, which incorporates both zero and gain adjustments.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ZN427J8 | Circular Connector; MIL SPEC:MIL-DTL-38999 Series III; Body Material:Metal; Series:TVPS00; No. of Contacts:4; Connector Shell Size:21; Connecting Termination:Crimp; Circular Shell Style:Wall Mount Receptacle; Body Style:Straight |
| ZN428 | 8-BIT LATCHED INPUT D-A CONVERTER |
| ZN428J8DC | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| ZN428DMP | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| ZN428E-8 | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZN428 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT LATCHED INPUT D-A CONVERTER |
| ZN428D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT LATCHED INPUT D-A CONVERTER |
| ZN428DMP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter |
| ZN428E8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT LATCHED INPUT D-A CONVERTER |
| ZN428E-8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter |
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