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參數(shù)資料
| 型號： | ADS7819 |
| 英文描述： | CMOS Dual 4-Input NOR Gate 14-SOIC -55 to 125 |
| 中文描述： | 12位800kHz采樣CMOS模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 317K |
| 代理商： | ADS7819 |
ADS7819
7
BASIC OPERATION
Figure 1 shows a basic circuit to operate the ADS7819.
Taking R/C (pin 23) LOW for 40ns will initiate a conver-
sion. BUSY (pin 25) will go LOW and stay LOW until the
conversion is completed and the output registers are up-
dated. Data will be output in Binary Two’s Complement
with the MSB on D11 (pin 6). BUSY going HIGH can be
used to latch the data. All convert commands will be ignored
while BUSY is LOW.
FIGURE 1. Basic Operation
CS
R/C
BUSY
OPERATION
1
↓
X
X
None. Databus in Hi-Z state.
0
1
Initiates conversion. Databus remains in
Hi-Z state.
0
↓
1
Initiates conversion. Databus enters Hi-Z
state.
0
1
↑
Conversion completed. Valid data from the
most recent conversion on the databus.
↓
1
1
Enables databus with valid data from the
most recent conversion.
↓
1
0
Conversion in progress. Databus in Hi-Z
state, enabled when the conversion is completed.
0
↑
0
Conversion in progress. Databus in Hi-Z
state, enabled when the conversion is completed.
0
0
↑
Conversion completed. Valid data from the
most recent conversion in the output register
but the output pins D11-D0 are tri-stated.
X
X
0
New convert commands ignored. Conversion
in progress.
Table I. Control Line Functions for ‘read’ and ‘convert’.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ADS7819
50
±2.5V
–5V
+5V
0.1μF
NC
10μF
+
10μF
+
0.1μF
Convert Pulse
BUSY
40ns min
D0 (LSB)
D1
D2
D3
D6
D5
D4
D7
D8
D9
D10
D11 (MSB)
0.1μF 10μF
+
The ADS7819 will begin tracking the input signal at the end
of the conversion. Allowing 1.25
μ
s between convert com-
mands assures accurate acquisition of a new signal.
STARTING A CONVERSION
The combination of CS (pin 24) and R/C (pin 23) LOW for
a minimum of 40ns puts the sample/hold of the ADS7819 in
the hold state and starts a conversion. BUSY (pin 25) will go
LOW and stay LOW until the conversion is completed and
the internal output register has been updated. All new
convert commands during BUSY LOW will be ignored.
The ADS7819 will begin tracking the input signal at the end
of the conversion. Allowing 1.25
μ
s between convert com-
mands assures accurate acquisition of a new signal. Refer to
Table I for a summary of CS, R/C, and BUSY states and
Figures 2 and 3 for timing parameters.
DESCRIPTION
ANALOG VALUE
DIGITAL OUTPUT
Full Scale Range
±
2.5V
1.22mV
Least Significant
Bit (LSB)
BINARY CODE
HEX CODE
+Full Scale
(2.5V – 1LSB)
2.499V
0111 1111 1111
7FF
Midscale
0V
0000 0000 0000
000
One LSB below
Midscale
–1.22mV
1111 1111 1111
FFF
–Full Scale
TABLE II. Ideal Input Voltages and Output Codes.
–2.5V
1000 0000 0000
800
BINARY TWO'S COMPLEMENT
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PDF描述 |
|---|---|
| ADS7819P | CMOS Dual 4-Input NOR Gate 14-SOIC -55 to 125 |
| ADS7819U | 12-Bit 800kHz Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
| ADS7820 | CMOS Dual 4-Input NOR Gate 14-SOIC -55 to 125 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7819 WAF | 制造商:Texas Instruments 功能描述: |
| ADS7819P | 制造商:Rochester Electronics LLC 功能描述:12 BIT A/D CONVERTER - Bulk |
| ADS7819PB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADS7819U | 制造商:Texas Instruments 功能描述: |
| ADS7819UB | 制造商:Rochester Electronics LLC 功能描述:12 BIT A/D CONVERTER - Bulk |
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