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參數(shù)資料
| 型號(hào)： | ADS7803 |
| 英文描述： | ECONOLINE: REC3-S_DRW(Z)/H4,H6 - Safety standards and approval: EN 60950 certified, rated for 250VAV (LVD test report)- Applied for Ul 1950 Component Recognised Certification- 3W DIP Package- 4kVDC & 6kVDC Isolation- Regulated Output- Continuous Short Circiut Protection Auto-Restarting |
| 中文描述： | Autocalibrating，4通道，12位模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大小： | 99K |
| 代理商： | ADS7803 |
ADS7803
12
FIGURE 11. Power Supply and Reference Decoupling.
Figure 11 shows a good supply approach, powering both V
A
and V
D
from a clean linear supply, with the 10
resistor
between V
A
and V
D
insuring that V
D
comes up after V
A
.
This is also a good method to further isolate the ADS7803
from digital supplies in a system with significant switching
currents that could degrade the accuracy of conversions.
GROUNDING
To maximize accuracy of the ADS7803, the analog and
digital grounds are not connected internally. These points
should have very low impedance to avoid digital noise
feeding back into the analog ground. The V
REF
– pin is used
as the reference point for input signals, so it should be
connected directly to AGND to reduce potential noise prob-
lems.
EXTERNAL CLOCK OPERATION
The circuitry required to drive the ADS7803 clock from an
external source is shown in Figure 12a. The external clock
must provide a 0.8V max for LOW and a 3.5V min for
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
FIGURE 12. Internal Clock Operation.
R
+5V
To
ADS7803
Pin 23
To
ADS7803
Pin 23
CLK
74HC-Compatible
Clock Source
(a) External Clock Operation
(b) Internal Clock Operation
See Typical Performance
Curves for R Values
vs Frequency
FIGURE 14.
±
10V Input Range.
HIGH, with rise and fall times that do not exceed 200ns. The
duty cycle of the external clock can vary as long as the LOW
time and HIGH time are each at least 200ns wide. Synchro-
nizing the conversion clock to an external system clock is
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.
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.
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 ADS7803, using a precision, low-cost
complete difference amplifier, INA105.
OPA627
0 to 5V
to
ADS7803
R
1
10k
±10V
Input
R
3
10k
±5V
(V
REF
+)
R
2
5k
FIGURE 13.
±
5V Input Range.
25k
+5V (V
REF
+)
±5V
Input
0 to 5V
to
ADS7803
25k
25k
25k
2
5
6
1
3
INA105
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS7803BN | Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS7803BP | Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS7807UBE4 | Low-Power, 16-Bit, Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
| ADS7807UBG4 | Low-Power, 16-Bit, Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
| ADS7807UE4 | Low-Power, 16-Bit, Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7803BN | 制造商:BB 制造商全稱:BB 功能描述:Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS7803BP | 制造商:BB 制造商全稱:BB 功能描述:Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS7804 | 制造商:BB 制造商全稱:BB 功能描述:12-Bit 10ms Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
| ADS7804P | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10us Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7804PB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10us Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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