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參數資料
| 型號： | ADS7803BP |
| 英文描述： | Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | Autocalibrating，4通道，12位模擬數字轉換器 |
| 文件頁數： | 11/13頁 |
| 文件大小： | 99K |
| 代理商： | ADS7803BP |
11
ADS7803
FIGURE 8. Measuring Active LOW to/from Hi-Z State.
FIGURE 9. Measuring Active HIGH to/from Hi-Z State.
to reduce dynamic errors, since the reference provides pack-
ets of current as the successive approximation steps are
carried out.
V
REF
+ must not exceed V
A
. Although the accuracy is speci-
fied with V
REF
+ = 5V and V
REF
– = 0V, the converter can
function with V
REF
+ as low as 4.5V and V
REF
– as high as
1V.
As long as there is at least a 4.5V difference between V
REF
+
and V
REF
–, the absolute value of errors does not change
significantly, so that accuracy will typically be within
±
1LSB
The power supply to the reference source needs to be
considered during system design to prevent V
REF
+ from
exceeding (or overshooting) V
A
, particularly at power-on.
Also, after power-on, if the reference is not stable within
42,425 clock cycles, an additional calibration cycle may be
needed.
POWER SUPPLIES
The digital and analog power supply lines to the ADS7803
should be bypassed with 10
μ
F tantalum capacitors as close
to the part as possible. Although ADS7803 has excellent
power supply rejection, even for higher frequencies, linear
regulated power supplies are recommended.
Care should be taken to insure that V
D
does not come up
before V
A
, or permanent damage to the part may occur.
ADS7803
Output
C
L
5V
3k
Test
Point
(a) Load Circuit
(b) From LOW to Hi-Z, C
L
= 10pF
t
FALL
90%
50%
V
D
Gnd
V
D
V
OL
10%
t
15
t
14
10%
V
D
t
RISE
10%
90%
50%
V
D
Output
Enable
Gnd
V
OL
t
13
0.8V
Output
Enable
(c) From Hi-Z to LOW, C
L
= 100pF
ADS7803
Output
C
L
3k
Test
Point
(a) Load Circuit
(b) From HIGH to Hi-Z, C
L
= 10pF
t
FALL
90%
50%
V
D
Gnd
V
OH
Gnd
90%
t
15
t
14
10%
V
OH
t
RISE
10%
90%
50%
V
D
Output
Enable
Gnd
Gnd
t
13
2.4V
Output
Enable
(c) From Hi-Z to HIGH, C
L
= 100pF
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
ADS7803
To
ADS7803
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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:模數轉換器 - ADC 12-Bit 10us Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7804PB | 功能描述:模數轉換器 - ADC 12-Bit 10us Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7804PBG4 | 功能描述:模數轉換器 - ADC 12B 10us Sampling CMOS ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7804PG4 | 功能描述:模數轉換器 - ADC 12-Bit 10us Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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