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參數(shù)資料
| 型號： | ADC12L038 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 串行ADC |
| 英文描述： | 3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold(可自行校對3.3V12位串行輸入/輸出帶MUX，采樣/保持功能A/D轉(zhuǎn)換器) |
| 中文描述： | 3.3自校準12位帶符號串行I /辦公自動化/ D轉(zhuǎn)換器MUX和采樣/保持（可自行校對3.3V12位串行輸入/輸出帶復(fù)用，采樣/保持功能的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 26/36頁 |
| 文件大小： | 819K |
| 代理商： | ADC12L038 |
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Application Hints
(Continued)
tion is issued to the ADC while a hardware power up is in
effect (PD pin low), the device will power down. When the
device is powered down by software, it may be powered up
by either issuing a software power up instruction or by taking
PD pin high and then low. If the power down command is
issued during an A/D conversion, that conversion is dis-
rupted. Therefore, the data output after power up cannot be
relied on.
1.6 User Mode and Test Mode
An instruction may be issued to the ADC to put it into test
mode. Test mode is used by the manufacturer to verify
complete functionality of the device. During test mode
CH0–CH7 become active outputs. If the device is inadvert-
ently put into the test mode with CS low continuously, the
serial communications may be desynchronized. Synchroni-
zation may be regained by cycling the power supply voltage
to the device. Cycling the power supply voltage will also set
the device into user mode. If CS is used in the serial inter-
face, the ADC may be queried to see what mode it is in. This
is done by issuing a “read STATUS register” instruction to the
ADC. When bit 9 of the status register is high the ADC is in
test mode; when bit 9 is low the ADC is in user mode. As an
alternative to cycling the power supply, an instruction se-
quence may be used to return the device to user mode. This
instruction sequence must be issued to the ADC using CS.
The following table lists the instructions required to return the
device to user mode:
Instruction
DI Data
DI3
X
L
L
L
L
L
DI0
H
L
L
L
L
L
H
or
L
H
or
L
H
or
L
DI1
X
L
L
L
L
L
DI2
X
L
L
L
L
L
DI4
H
H
H
H
H
H
DI5
H
H
L
L
H
L
DI6
H
H
H
H
H
H
DI7
H
L
L
H
H
L
TEST MODE
RESET
TEST MODE
INSTRUCTIONS
USER MODE
Power Up
Set DO with
or without
Sign
Set
Acquisition
Time
Start
a
Conversion
L
L
L
H
H
L
H
H
or
L
H
or
L
L
L
H
H
H
L
H
or
L
H
or
L
H
or
L
H
or
L
H
or
L
L
X = Don’t Care
After returning to user mode with the user mode instruction
the power up, data with or without sign, and acquisition time
instructions need to be resent to ensure that the ADC is in
the required state before a conversion is started.
1.7 Reading the Data Without Starting a Conversion
The data from a particular conversion may be accessed
without starting a new conversion by ensuring that the
CONV line is taken high during the I/O sequence. See the
Read Data timing diagrams. Table 6 describes the operation
of the CONV pin.
2.0 DESCRIPTION OF THE ANALOG MULTIPLEXER
For the ADC12L038, the analog input multiplexer can be
configured with 4 differential channels or 8 single ended
channels with the COM input as the zero reference or any
combination thereof (see Figure 9 ). The difference between
the voltages on the V
REF+
and V
REF
pins determines the
input voltage span (V
). The analog input voltage range is
0 to V
A+
. Negative digital output codes result when V
IN
>
V
IN+
. The actual voltage at V
IN
or V
IN+
cannot go below
AGND.
CH0, CH2, CH4, and CH6 can be assigned to the MUX-
OUT1 pin in the differential configuration, while CH1, CH3,
CH5, and CH7 can be assigned to the MUXOUT2 pin. In the
differential configuration, the analog inputs are paired as
follows: CH0 with CH1, CH2 with CH3, CH4 with CH5 and
CH6 with CH7. The A/DIN1 and A/DIN2 pins can be as-
signed positive or negative polarity.
With the single-ended multiplexer configuration CH0 through
CH7 can be assigned to the MUXOUT1 pin. The COM pin is
always assigned to the MUXOUT2 pin. A/DIN1 is assigned
as the positive input; A/DIN2 is assigned as the negative
input. (See Figure 10 ).
The Multiplexer assignment tables for the ADC12L030,2,4,8
(Tables 2, 3, 4) summarize the aforementioned functions for
the different versions of A/Ds.
4 Differential
Channels
DS011830-38
8 Single-Ended Channels
with COM
as Zero Reference
DS011830-39
FIGURE 9.
A
www.national.com
26
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| ADC12L038CIWMX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
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