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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)： | 13/13頁 |
| 文件大?。?/td> | 99K |
| 代理商： | ADS7803 |
13
ADS7803
FIGURE 15. Interface to Motorola Microprocessors.
Figure 14 shows a circuit to convert a bipolar
±
10V input
signal into a unipolar 0 to 5V signal for conversion by the
ADS7803. 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 ADS7803 converting continually and apply +9.9927V
(+10V – 1.5LSB) at the input. Adjust R
3
until the ADS7803
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
ADS7803 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 ADS7803, to match the
performance of the self-calibration provided by the con-
verter.
INTERFACING TO
MOTOROLA MICROPROCESSORS
Figure 15 show a typical interface to Motorola microproces-
sors, while Figure 16 shows how the result can be placed in
register D0.
Conversion is initiated by a write instruction decoded by the
address decoder logic, with the lower two bits of the address
bus selecting an ADC input channel, as follows:
MOVE.W D0, ADC-ADDRESS
The result of the conversion is read from the data bus by a
read instruction to ADC-ADDRESS as follows:
MOVEP.W $000 (ADC-ADDRESS), D0
This puts the 12-bit conversion result in the D0 register, as
shown in Figure 15. The address decoder must pull down
ADC_CS AT ADC-ADDRESS to access the Low byte and
ADC-ADDRESS +2 to access the High byte.
INTERFACING TO INTEL MICROPROCESSORS
Figure 17 shows a typical interface to Intel.
A conversion is initiated by write instruction to address
ADC_CS. Data pins DO0 and DO1 select the analog input
channel. The BUSY signal can be used to generate a micro-
processor interrupt (INT) when the conversion is completed.
A read instruction from the ADC_CS address fetches the
Low byte, and a read instruction from the ADC_CS address
+2 fetches the High byte.
FIGURE 16. Conversion Results in Motorola Register D0.
B
U
S
Y
31
24 23
16 15
0
D
B
10
0
0
D
B
9
D
B
8
D
B
7
D
B
6
D
B
5
D
B
4
D
B
3
D
B
2
D
B
1
D
B
0
D
B
11
8
7
M
S
B
L
S
B 0
FIGURE 17. Interface to Intel Microprocessors.
Address
Decoder
Logic
Address Bus
HBE
ADS7803
SFR BUSY
CS
RD
WR
D0 - D7
A1
A0
A1 - A23
(A0 - A19)
DO 0 - DO 7
DO 0
DO 1
AS
DACK
R/W
A1
INT
MC68000
(MC68008)
ADC_CS
Address
Decoder
Logic
Address Bus
HBE
ADS7803
SFR BUSY
CS
RD
WR
D0 - D7
A1
A0
Intel
Microprocessor
Based Systems
Data Bus
DO 0
DO 1
(IO/M)
R/D
A2
INT
ADC_CS
WR
8085
8086/88
80186/188
80286
8031
8051
A1
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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