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參數(shù)資料
| 型號： | ADS7833N |
| 英文描述： | 10-Channel, 12-Bit DATA ACQUISITION SYSTEM |
| 中文描述： | 10通道，12位數(shù)據(jù)采集系統(tǒng) |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 150K |
| 代理商： | ADS7833N |
ADS7833
10
DAC OUTPUT VOLTAGE
The value of the DAC output voltage is determined by the
DAC Input portion of the SER
IN
word (bits 0 through 7—see
Figure 2). The 8-bit DAC has 256 possible output voltages
from 0V to +2.49V. The value of 1 LSB is 0.0098V.
ANALOG-TO-DIGITAL
CONVERTERS
ARCHITECTURE
The ADCs are 12-bit, successive approximation types imple-
mented with a switched capacitor circuitry.
SPEED
The clock for the ADC conversion is supplied externally at
the CLK pin. Maximum clock frequency for specified accu-
racy is 2.1MHz. This results in a complete conversion cycle
(S/H acquisition and A/D conversion) of 6.6
μ
s.
INPUT/OUTPUT
The ADS7833 is designed for bipolar input voltages and
uses a binary two’s complement digital output code. A
programmable gain function is associated with each ADC.
This changes the full scale analog input range and the analog
resolution of the converter. Details are shown in Table VI.
DIFFERENTIAL AND COMMON-MODE
INPUT VOLTAGES
The ADS7833 is designed with full differential signal paths
all the way from the multiplexer inputs through to the input
of the ADCs. This was done to provide superior high
frequency noise rejection.
As is common with most differential input semiconductor
devices, there are compound restrictions on the combination
of differential and common-mode input voltages. This mat-
ter is made slightly more complicated by the fact that most
of the analog inputs are capable of being affected by the
programmable gain function. The possible differential and
single ended configurations are shown in Figures 3a and 3b.
The maximum differential and common mode restrictions
are shown in Table VII.
DESCRIPTION
GAIN SELECT CODE
0
1
2
3
GAIN
5V/V
2.5V/V
1.25V/V
1.0V/V
FULL SCALE RANGE
±
0.5V
±
1.0V
±
2.0V
±
2.5V
HEX CODE
BINARY CODE
+Full Scale (FS –1LSB)
One Bit above Mid-Scale
Mid-Scale
One Bit Below Mid-Scale
–Full Scale
+0.49976
+0.244mV
0V
–0.244V
–0.500V
+0.9995V
+0.488mV
0V
–0.488mV
–1.000V
+1.999V
+0.976mV
0V
–0.976mV
–2.000V
+2.499
+1.22mV
0V
–1.22mV
–2.500V
7FF
H
001H
000
H
FFF
H
800
H
0111 1111 1111
0000 0000 0001
0000 0000 0000
1111 1111 1111
1000 0000 0000
NOTE: The programmable gain function applies to all three input channels for ADC
1
and ADC
2
. However, the programmable gain function only applies to the
first input (V
3-1
) for ADC
. The other three inputs (V
3-2
, V
3-3
, and V
3-4
) are not affected by the GAIN SEL input. They operate at a fixed gain of 1V/V and thus
have a fixed
±
2.5V full scale input range.
ANALOG INPUT
BINARY TWO’S COMPLIMENT FORMAT
TABLE VI. Analog Input - Digital Output Relationships.
DIGITAL OUTPUT
DIGITAL INPUT
DAC INPUT
0-7
ANALOG OUTPUT
HEX
CODE
BINARY
CODE
00
H
01
H
FF
H
0000 0000
0000 0001
1111 1111
0V
+0.0098V
+2.499
TABLE V. DAC Input/Output Relationships.
GAIN SELECT CODE
0
1
2
3
Gain
5.0V/V
2.5V/V
1.25V/V
1.0V/V
Full Scale Range
(V
D
with V
CM
= 0)
±
0.5V
±
1.0V
±
2.0V
±
2.5V
Largest Positive
Common Mode
Voltage, V
CM
+
+2.7V
+2.4V
+1.9V
+1.6V
Largest Negative
Common Mode
Voltage, V
CM
–
–2.7V
–2.4V
–1.9V
–1.6V
TABLE VII. Differential and Common Mode Voltage
Restrictions.
FIGURE 3. (a) Differential Signal Source, and (b) Single
Ended Signal Source.
V
CM
+
–
V
D
2
+
–
+
–
V
D
2
V
1 – 1P
V
1 – 1N
V
CM
+
–
+
–
V
1 – 1P
V
1 – 1N
V
D
V
CM
V
CM
V
D
2
V
CM
V
D
V
D
2
V
1 – 1 +
V
1 – 1 –
V
1 – 1
(A)
(B)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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| ADS7834E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADS7834E/250 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit High Speed Low Power Sampling 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 |
| ADS7834E/250G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit High Speed Low Power Sampling 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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