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參數(shù)資料
| 型號(hào)： | ZN427E-8 |
| 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)： | 9/17頁 |
| 文件大小： | 311K |
| 代理商： | ZN427E-8 |
ZN427
8
ANALOG CIRCUITS
D-A converter
IThe converter is of the voltage switching type and uses an R-
2R ladder network as shown in Fig.10. Each element is
connected to either 0V or V
IN by transistor voltage switches
specially designed for low offset voltage (<1mV).
A binary weighted voltage is produced at the output of the R-
2R ladder.
D to A output = n (V
REF
IN -V
OS
) + V
OS
256
where n is the digital input to the D-A from successive
approximation register.
V
is a small offset voltage that is produced by the device
supply current flowing in the package lead resistance. The
value of V
OS
is typically 2mV for the ZN427E8 and 4mV for the
ZN427J8.
This offset will normally be removed by the setting up
procedure and since the offset temperature coefficient is low
(8
μ
V/
°
C), the effect on accuaracy will be negligible.
The D-A output range can be considered to be 0 - V
REF IN
through an output resistance R (4k).
REFERENCE
(a) Internal reference
The internal reference is an active bandgap circuit which is
equivalent to a 2.5V Zener diode with a very low slope
impedance (Fig.11). A Resistor (R
) should be connected
between pins 8 and 10. The recommended value of 390
will
supply a nominal reference current of (5.0 - 2.5)/0.39=6.4mA.
A stabilising/decoupling capacitor, C
(4
μ
7), is required
between pins 8 and 9. For internal reference operation V
REF
OUT (pin 8) is connected to V
REF
IN (pin 7).
UP to five ZN427's may be driven from one internal reference,
there being no need to reduce R
. This useful feature saves
power and gives excellent gain tracking between the
converters.
Alternatively the internal reference can be used as the
reference voltage for other external circuits and can source or
sink up to 3mA.
Fig.10 R-2R ladder network
2R
2R
2R
2R
2R
R(4k)
R
R
R
D TO A OUTPUT
BIT 2
BIT 8
VOS
BIT 7
BIT 1
MSB
0 VOLTS
(PIN 9)
VREF IN
(PIN 7)
VOLTAGE
SWITCHES
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ZN427E8DP | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| ZN427J-8 | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| ZN427J8DC | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZN427E8DP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ZN427J8 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:MICROPROCESSOR COMPATIBLE 8-BIT SUCCESSIVE APPROXIMATION A-D CONVERTER |
| ZN427J-8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ZN427J8DC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| 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 |
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