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參數(shù)資料
| 型號(hào)： | ZN428 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-BIT LATCHED INPUT D-A CONVERTER |
| 中文描述： | 8位DA轉(zhuǎn)換器的輸入鎖存 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大小： | 272K |
| 代理商： | ZN428 |
ZN428
Up to five ZN428s may be driven from one internal
reference (there is no need to reduce R
REF
). This useful
feature saves power and gives excellent gain tracking
between the converters.
(b) External Reference
If required an external reference voltage may be connected
to V
REF IN
. The slope resistance of such a reference should be
less than
2.5
, where n is the number of
converters supplied.
n
V
REF IN
can be varied from 0 to +3V for ratiometric
operation. The ZN428 is guaranteed monotonic for V
REF IN
above 2V.
LOGIC
Input coding is binary for unipolar operation and offset
binary for bipolar operation. When the ENABLE input is low
the data inputs drive the D to A directly. When ENABLE goes
high the input data word is held in the data latch.
The equivalent circuit for the data and clock inputs is
shown in Fig.6.
The ZN428 is provided with separate analog and digital
ground connections. The circuit will operate correctly with as
much as
±
200mV between the two grounds.
Fig.6 Equivalent circuit of all inputs
OPERATING NOTES
(1) Unipolar D-A Converter
The nominal output range of the ZN428 is 0 to V
REF IN
through a 4
resistance. Other output ranges can readily be
obtained by using an external amplifier.
The general scheme (Fig.7) is suitable for amplifiers
with input bias currents less than 1.5
μ
A.
The resulting full-scale range is given by:
V
OUT
FS =
(
1 + R1
)
V
REF IN
= G.V
REF IN
R2
The impedance at the inverting input is R1//R2 and for
low drift with temperature this parallel combination should be
equal to the ladder resistance (4k
). The required nominal
values of R1 and R2 are given by R1 = 4Gk
and R
2
=
4G/(G-1)k
.
Using these relationships a table of nominal resistance
values for R
1
and R
2
can be constructed for V
REF IN
= 2.5V.
For gain setting R
1
is adjusted about its nominal value.
Practical circuit realisations (including amplifier stabilising
components) for +5 and +10V output ranges are given in
Fig.8. Settling time for a major transition is 1.5
μ
s typical.
Output Range
G
R
1
R
2
+5V
2
8k
8k
+10V
4
16k
5.33k
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| ZN428E8DP | 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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