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參數(shù)資料
| 型號： | ADS7832 |
| 英文描述： | CMOS Hex Inverting Buffer/Converter 16-SOIC -55 to 125 |
| 中文描述： | Autocalibrating，4通道，12位模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 299K |
| 代理商： | ADS7832 |
ADS7832
12
CONTROL LINES
Table IV shows the functions of the various control lines on
the ADS7832. The use of standard CS, RD and WR control
signals simplifies use with most microprocessors. At the
same time, flexibility is assured by availability of status
information and control functions, both through the SFR and
directly on pins.
INSTALLATION
INPUT IMPEDANCE
ADS7832 has a very high input impedance (input bias
current over temperature is 100nA max), and a low 50pF
input capacitance. To ensure a conversion accurate to 12
bits, the analog source must be able to charge the 50pF and
settle within the first five clock cycles after a conversion is
initiated. During this time, the input is also very sensitive to
noise at the analog input, since it could be injected into the
capacitor array.
In many applications, a simple passive low-pass filter as
shown in Figure 10a can be used to improve signal quality.
In this case, the source impedance needs to be less than 5k
to keep the induced offset errors below 1/2LSB, and to meet
the acquisition time of five clock cycles. The values in
Figure 10a meet these requirements, and will maintain the
full power bandwidth of the system. For higher source
impedances, a buffer like the one in Figure 10b should be
used.
INPUT PROTECTION
The input signal range must not exceed
±
V
REF
or V
A
by
more than 0.3V.
The analog inputs are internally clamped to V
A
. To prevent
damage to the ADS7832, the current that can flow into the
inputs must be limited to 20mA. One approach is to use an
external resistor in series with the input filter resistor. For
example, a 1k
input resistor allows an overvoltage to 20V
without damage.
REFERENCE INPUTS
A 10
μ
F tantalum capacitor is recommended between V
REF
+
and V
REF
– to insure low source impedance. These capaci-
tors should be located as close as possible to the ADS7832
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.
FIGURE 7. Timing for Initiating Conversion in Sample/Hold Control Mode (D2 in SFR HIGH).
CS
RD
WR
SFR
HBE
CAL
BUSY
OPERATION
X
X
X
X
X
0
↑
1
X
Initiates calibration cycle. (See SFR section for alternate use as Sample/
Hold Control Mode input.)
Conversion or calibration in process. Inhibits new conversion from starting.
None. Outputs in Hi-Z State.
Initiates conversion.
Low byte conversion results output on data bus.
High byte conversion results output on data bus.
Write to SFR and rising edge on WR initiates conversion.
Contents of SFR output on data bus.
Reserved for factory use.
Reserved for factory use. (Unpredictable data on data bus.)
X
1
0
0
0
0
0
0
0
X
X
1
0
0
1
0
1
0
X
X
X
X
0
0
0
1
1
1
1
X
X
X
0
1
1
1
0
0
X
1
1
1
1
1
1
1
1
0
X
1
X
X
1
X
X
X
0
↑
1
1
1
0
1
0
1
TABLE IV. Control Line Functions.
Sample
Sample
Convert
Hold
t
18
t
20
t
19
BUSY
SHC
(Pin 26)
CLK
1
2
11
12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS7832BN | Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS7832BP | Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS7833 | CMOS Hex Inverting Buffer/Converter 16-SO -55 to 125 |
| ADS7833N | 10-Channel, 12-Bit DATA ACQUISITION SYSTEM |
| ADS7834 | 12-Bit High Speed Low Power Sampling ANALOG-TO-DIGITAL CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7832BN | 制造商:Rochester Electronics LLC 功能描述: |
| ADS7832BP | 功能描述:IC 12-BIT 4CH A/D 28-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| ADS7833 | 制造商:BB 制造商全稱:BB 功能描述:10-Channel, 12-Bit DATA ACQUISITION SYSTEM |
| ADS7833N | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 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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