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參數(shù)資料
| 型號： | ADS7832 |
| 英文描述： | CMOS Hex Inverting Buffer/Converter 16-SOIC -55 to 125 |
| 中文描述： | Autocalibrating，4通道，12位模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/15頁 |
| 文件大?。?/td> | 299K |
| 代理商： | ADS7832 |
ADS7832
14
R
+5V
To
ADS7832
Pin 23
To
ADS7832
Pin 23
CLK
74HC-Compatible
Clock Source
(a) External Clock Operation
(b) Internal Clock Operation
See Figure 15 for typical
R Values vs Frequency
FIGURE 10. Input Signal Conditioning.
OPA627
R
C
V
REF
– (Normally 0V)
(b) Active Low Pass Filter
50
5nF
V
REF
– (Normally 0V)
(a) Passive Low Pass Filter
Analog
Input
Analog
Input
To
ADS7832
To
ADS7832
recommended in microprocessor applications to prevent
beat-frequency problems.
Note that the electrical specification tables are based on
using an external 2MHz clock. Typically, the specified
accuracy is maintained for clock frequencies between 0.5
and 2.4MHz.
FIGURE 11. Power Supply and Reference Decoupling.
SFR
AIN0
AIN1
AIN2
AIN3
V
REF
+
V
REF
–
DGND
V
D
D7
D6
D5
D4
D3
V
A
AGND
CAL
A1
A0
CLK
BUSY
HBE
WR
CS
RD
D0
D1
D2
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
10nF
+5V
10μF
10
10μF
10nF
+
+
10μF
10nF
+
5V
REF
INTERNAL CLOCK OPERATION
Figure 12b shows how to use the internal clock generating
circuitry. The clock frequency depends only on the value of
the resistor, as shown in “Internal Clock Frequency vs
R
CLOCK
” in the Typical Performance Curves section.
The clock generator can operate between 100kHz and 2MHz.
With R = 100k
, the clock frequency will nominally be
800kHz. The internal clock oscillators may vary by up to
20% from device to device, and will vary with temperature,
as shown in the typical performance curves. Therefore, use
of an external clock source is preferred in applications where
control of the conversion timing is critical, or where multiple
converters need to be synchronized.
FIGURE 12. Internal Clock Operation.
APPLICATIONS
BIPOLAR INPUT RANGES
Figure 13 shows a circuit to accurately and simply convert
a bipolar
±
5V input signal into a unipolar 0 to 5V signal for
conversion by the ADS7832, using a precision, low-cost
complete difference amplifier, INA105.
Figure 14 shows a circuit to convert a bipolar
±
10V input
signal into a unipolar 0 to 5V signal for conversion by the
ADS7832. The precision of this circuit will depend on the
matching and tracking of the three resistors used.
To trim this circuit for full 12-bit precision, R
2
and R
3
need
to be adjustable over appropriate ranges. To trim, first have
the ADS7832 converting continually and apply +9.9927V
(+10V – 1.5LSB) at the input. Adjust R
3
until the ADS7832
output toggles between the codes FFE hex and FFF hex.
This makes R
3
extremely close to R
1
. Then, apply –9.9976V
(–10V + 0.5LSB) at the input, and adjust R
2
until the
ADS7832 output toggles between 000 hex and 001 hex. At
each trim point, the current through the third resistor will be
almost zero, so that one trim iteration will be enough in most
cases. More iterations may be required if the op amp se-
lected has large offset voltage or bias currents, or if the +5V
reference is not precise.
This circuit can also be used to adjust gain and offset errors
due to the components preceding the ADS7832, to match the
performance of the self-calibration provided by the con-
verter.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS7832BN | Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS7832BP | Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS7833 | CMOS Hex Inverting Buffer/Converter 16-SO -55 to 125 |
| ADS7833N | 10-Channel, 12-Bit DATA ACQUISITION SYSTEM |
| ADS7834 | 12-Bit High Speed Low Power Sampling ANALOG-TO-DIGITAL CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7832BN | 制造商:Rochester Electronics LLC 功能描述: |
| ADS7832BP | 功能描述:IC 12-BIT 4CH A/D 28-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| ADS7833 | 制造商:BB 制造商全稱:BB 功能描述:10-Channel, 12-Bit DATA ACQUISITION SYSTEM |
| ADS7833N | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADS7834 | 制造商:BB 制造商全稱:BB 功能描述:12-Bit High Speed Low Power Sampling ANALOG-TO-DIGITAL CONVERTER |
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