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參數(shù)資料
| 型號： | 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)： | 5/13頁 |
| 文件大小： | 99K |
| 代理商： | ADS7803 |
5
ADS7803
TYPICAL PERFORMANCE CURVES
(CONT)
At V
A
= V
D
= V
REF
+ = 5V, V
REF
– = AGND = 0V, T
A
= +25
°
C, dynamic performance based on 2048 point FFTs
, unless otherwise noted.
THEORY OF OPERATION
ADS7803 uses the advantages of advanced CMOS technol-
ogy (logic density, stable capacitors, precision analog
switches, and low power consumption) to provide a precise
12-bit analog-to-digital converter with on-chip sampling and
four-channel analog-input multiplexer.
The input stage consists of an analog multiplexer with an
address latch to select from four input channels.
The converter stage consists of an advanced successive
approximation architecture using charge redistribution on a
capacitor network to digitize the input signal. A tempera-
ture-stabilized differential auto-zeroing circuit is used to
minimize offset errors in the comparator.
Linearity errors in the binary weighted main capacitor
network are corrected using a capacitor trim network and
correction factors stored in on-chip memory. The correction
terms are calculated by an on-chip microcontroller during a
calibration cycle, initiated either by power-up or by applying
an external calibration signal at any time. During conver-
sion, the correct trim capacitors are switched into the main
capacitor array as needed to correct the conversion accuracy.
With all of the capacitors in both the main array and the trim
array on the same chip, excellent stability is achieved, both
over temperature and over time.
For flexibility, timing circuits include both an internal clock
generator and an input for an external clock to synchronize
with external systems. Standard control signals and three-
state input/output registers simplify interfacing ADS7803 to
most micro-controllers, microprocessors or digital storage
systems.
The on-chip sampling provides excellent dynamic perfor-
mance for input signals to 50kHz, and has a full-power –3dB
bandwidth of 4MHz. Full control over sample-to-hold
timing is available for applications where this is critical.
Finally, this performance is matched with the low-power
advantages of CMOS structures to allow a typical power
consumption of 10mW, with a 50
μ
W power down option.
OPERATION
BASIC OPERATION
Figure 1 shows the simple circuit required to operate
ADS7803 in the Transparent Mode, converting a single
input channel. A convert command on pin 20 (WR) starts a
conversion. Pin 22 (BUSY) will output a LOW during the
conversion process (including sample acquisition and con-
version), and rises only after the conversion is completed.
The two bytes of output data can then be read using pin 18
(RD) and pin 21 (HBE).
FIGURE 1. Basic Operation.
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
Read Command
Convert
Command
High Byte
Enable
Command
BUSY
10nF
+5V
10μF
100k
NC
10μF
10nF
+
+5V
NC
Data Bit 7
Data Bit 6
Data Bit 5
Data Bit 4
Data Bit 3
BUSY
LOW
LOW
LOW
Data Bit 11
(MSB)
HBE Input
LOW
HBE Input
HIGH
Data Bit 8
Data Bit 9
Data Bit 10
Data Bit 0
(LSB)
Data Bit 1
Data Bit 2
HBE Input
HIGH
HBE Input
LOW
0 –5V
Input
+
INTERNAL CLOCK FREQUENCY vs TEMPERATURE
Ambient Temperature (°C)
–50
100
–25
75
0
25
50
R
CLOCK
= 70k
C
0.9
1.15
1.1
1.05
1
0.95
10
1
INTERNAL CLOCK FREQUENCY vs R
CLOCK
R
CLOCK
(k
)
C
0.1
10
1k
100
相關(guān)PDF資料 |
PDF描述 |
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| 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 |
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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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