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參數(shù)資料
| 型號： | ZM407 |
| 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 的低電流運算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大?。?/td> | 63K |
| 代理商： | ZM407 |
2
Functional Description
The
input amplifier
serves for
impedance matching and
amplifies the input signal.
In order to allow also bipolar
input signals to be processed
even if there is only one supply
voltage, a level shift takes
place in the input amplifier.
Using an external potentiome-
ter, such shift can be varied
into a
base line shift.
The measuring range can be
extended by connection of an
external voltage divider. An AC
input can be implemented by
means of an additional external
capacitor. Two special inputs
of the integrated circuit can be
connected with the external
voltage divider; they supply a
low current during the measu-
rement pauses. The resulting
voltage at the pins indicates
the selected measurement
range. Two more pins have
been provided for detection of
the selected signal coupling
type. The external AC/DC
switch is to tie the pins to gro-
und. The status information
about measurement range and
coupling type, multiplexed with
the measured data, is provided
for interpretation at the
bidi-
rectional interface
.
The measured signal is digiti-
zed in an
analog-to-digital
converter
operating according
to the flash principle. When the
measurement is activated, it
converts the input signal into a
6-bit digital word at a fixed
conversion rate of 20 MHz.
The 63 comparators of the
flash ADC consist of a differen-
tial stage with subsequent
latch.
For storaging the measured
data, the integrated circuit
contains an
SRAM
which is 6
bits wide and 128 values deep
.
The SRAM Write signal is ge-
nerated by the
Time Base
unit
by means of a programmable
shift register.
The time base is freely se-
lectable within the range from
2
0
to 2
16
times the clock peri-
od.
Connection with a 20-MHz
quartz will result in a range
from 50ns to 3,27ms.
The RAM bypass mode creates
more possibilities of applicati-
on; the values are output di-
rectly to the bidirectional inter-
face, not into the RAM.
The measurement can be initia-
ted by an external signal or,
controlled by the
trigger logic
,
depending on the level of the
input signal, in an automatic or
edge- and level triggered mo-
de.
For this purpose, there is a
comparator, the reference level
of which can be selected in five
discrete stages. The compara-
tor has been provided with a
hysteresis for noise suppressi-
on.
The
Control
unit coordinates
the circuit functions, such as
the data exchange via the inter-
face. Measured data and status
information are output in paral-
lel. The loading of the time
base, trigger level, trigger mo-
de parameters into registers,
which is uncritical with regard
to time, is done serially via 2
pins of the bidirectional inter-
face.
The analog part of the circuit is
activated only during the short
data recording time, which
significantly reduces the total
power consumption.
For special applications, e. g.
for control of an LCD module, a
shift register
has been imple-
mented. Loading of information
into the shift register is parallel,
while the output is serial via
two pins.
Pin Configuration
8
9
10
7
11 12 13 14 15 16 17
6
5
4
3
2
1
44
43
42
41
40
38 37 36
39
35 34 33 32 31 30 29
19
18
20
21
22
23
24
25
26
27
28
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