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參數(shù)資料
| 型號： | SP8605 |
| 元件分類： | 串行ADC |
| 英文描述： | 12-Bit Sampling A/D Converters |
| 中文描述： | 12位采樣的A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 205K |
| 代理商： | SP8605 |
83
FEATURES...
The
SP86XX Series
are specified at sampling
rates of 333kHz (
SP8603
), 200kHz (
SP8605
) or
100kHz (
SP8610
). Conversion times are factory
set for 2.70
μ
s, 4.7
μ
s and 9.7
μ
s maximum, re-
spectively, over temperature, and the high-
speed sampling input stage insures a total acqui-
sition and conversion time of 3
μ
s, 5
μ
s and 10
μ
s
maximum, respectively, over temperature. Pre-
cision, laser-trimmed scaling resistors provide
industry-standard input ranges of 0V to +5V or
0V to +10V.
The 28-pin
SP86XX Series
are available in
narrow plastic DIP, and SOIC packages and it
operates from a single +5V supply. The
SP86XX
Series
are available in grades specified over the
0
°
C to +70
°
C commercial temperature ranges.
OPERATION
Basic Operation
Figure 1
shows the simple hookup circuit required
to operate the
SP86XX Series
in a 0V to +10V
range in the Convert Mode. A convert command
arriving on R/C puts the
SP86XX Series
in the
HOLD mode, and a conversion is started. This
pulse must be LOW for a minimum of 40ns.
Because this pulse establishes the sampling instant
of the A/D, it must have very low jitter. BUSY will
be held LOW during the conversion, and rises only
after the conversion is completed and the data has
been transferred to the output drivers. Thus, the
rising edge can be used to read the data from the
conversion. Also, during conversion, the BUSY
signal puts the output data lines in Hi-Z states and
inhibits the input lines. This means that pulses on
R/C are ignored, so that new conversions cannot be
initiated during a conversion
.
The
SP86XX Series
will begin acquiring a new
sample just prior to the BUSY output rising, and
will track the input signal until the next conversion
is started.
In the Read Mode, R/C is kept normally LOW, and
a HIGH pulse is used to read data and initiate a
conversion. In this mode, the rising edge of R/C
will enable the output data pins, and the data from
the previous conversion becomes valid. The fall-
ing edge then puts the
SP86XX Series
in a hold
mode, and initiates a new conversion.
For use with an 8-bit bus, the data can be read out in two
bytes under the control of HBE. With a LOW input
on HBE, at the end of a conversion, the 8 LSBs of data
are loaded into the output drivers on D
through D
and
D
through D
. Taking HBE HIGH then loads the 4
MSBs on D
3
through D
0
, with D
7
through D
4
being
forced LOW.
Analog Input Ranges
The
SP86XX Series
offers two standard unipolar
input ranges: 0V to +10V and 0V to +5V. If a 10V
unipolar range is required, the analog input signal
should be connected to pin 2. A signal requiring a
5V unipolar range should be connected to pin 3. In
either case, the other pin of the two must be
grounded or connected to the adjustment circuits
described in the section on calibration.
Controlling The SP86XX Series
The
SP86XX Series
can be easily interfaced to most
microprocessor-based and other digital systems. The
microprocessor may take full control of each conver-
sion, or the
SP86XX Series
may operate in a stand-
alone mode, controlled only by the R/C input. Full
control consists of initiating the conversion and read-
ing the output data at user command, transmitting data
either all 12-bits in one parallel word, or in two 8-bit
bytes. The three control inputs (CS, R/C and HBE) are
all TTL/CMOS compatible. The functions of the
Figure 1. Basic 0V to 10V Operation
2
3
4
5
6
7
8
9
10
11
12
13
27
26
25
24
23
22
21
20
19
18
17
16
(D0
Busy
Convert
0.1μF
6.8μF+
+5V
+5V
+5V
N.C.
BUSY
CS
R/C
HBE
D0 (LSB)
D1
D2
D3
DGND
IN 1
IN 2
V
REF
AGND
D11 (MSB)
D10
D9
D8
D7
D6
D5
D4
(D11
Out
Input
1
28
N.C.
N.C.
N.C.
N.C.
14
15
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