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参数资料
| 型号： | ADC08138CIWM |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | ADC |
| 英文描述： | 8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options, Voltage Reference, and Track/Hold Function |
| 中文描述： | 8-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 12/21页 |
| 文件大小： | 488K |
| 代理商： | ADC08138CIWM |
Functional Description
MULTIPLEXER ADDRESSING
The design of these converters utilizes a comparator struc-
ture with built-in sample-and-hold which provides for a differ-
ential analog input to be converted by a successiveapproxi-
mation routine.
The actual voltage converted is always the difference be-
tween an assigned “+” input terminal and a “” input terminal.
The polarity of each input terminal of the pair indicates which
line the converter expects to be the most positive. If the as-
signed “+” input voltage is less than the “” input voltage the
converter responds with an all zeros output code.
A unique input multiplexing scheme has been utilized to pro-
vide multiple analog channels with software-configurable
single-ended, differential, or pseudo-differential (which will
convert the difference between the voltage at any analog in-
put and a common terminal) operation. The analog signal
conditioning required in transducer-based data acquisition
systems is significantly simplified with this type of input flex-
ibility. One converter package can now handle ground refer-
enced inputs and true differential inputs as well as signals
with some arbitrary reference voltage.
A particular input configuration is assigned during the MUX
addressing sequence, prior to the start of a conversion. The
MUX address selects which of the analog inputs are to be
enabled and whether this input is single-ended or differential.
Differential inputs are restricted to adjacent channel pairs.
For example, channel 0 and channel 1 may be selected as a
differential pair but channel 0 or 1 cannot act differentially
with any other channel. In addition to selecting differential
mode the polarity may also be selected. Channel 0 may be
selected as the positive input and channel 1 as the negative
input or vice versa. This programmability is best illustrated by
the MUX addressing codes shown in the following tables for
the various product options.
The MUX address is shifted into the converter via the DI line.
Because the ADC08131 contains only one differential input
channel with a fixed polarity assignment, it does not require
addressing.
The common input line (COM) on the ADC08138 can be
used as a pseudo-differential input. In this mode the voltage
on this pin is treated as the “” input for any of the other input
channels. This voltage does not have to be analog ground; it
can be any reference potential which is common to all of the
inputs. This feature is most useful in single-supply applica-
tions where the analog circuity may be biased up to a poten-
tial other than ground and the output signals are all referred
to this potential.
TABLE 1. Multiplexer/Package Options
Part
Number
Number of Analog Channels
Single-Ended
Number of
Package
Pins
8
14
20
Differential
ADC08131
ADC08134
ADC08138
1
4
8
1
2
4
TABLE 2. MUX Addressing: ADC08138
Single-Ended MUX Mode
MUX Address
SGL/
DIF
1
1
1
1
1
1
1
1
Analog Single-Ended Channel
#
3
4
START
ODD/
SIGN
0
0
0
0
1
1
1
1
SELECT
1
0
0
1
1
0
0
1
1
0
1
2
5
6
7
COM
0
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
+
+
+
+
+
+
+
+
TABLE 3. MUX Addressing: ADC08138
Differential MUX Mode
MUX Address
SGL/
DIF
0
0
0
0
0
0
Analog Differential Channel-Pair
#
1
2
3
START
ODD/
SIGN
0
0
0
0
1
1
SELECT
1
0
0
1
1
0
0
0
2
3
0
0
1
0
1
0
1
0
+
1
4
5
6
7
1
1
1
1
1
1
+
+
+
+
+
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相关PDF资料 |
PDF描述 |
|---|---|
| ADC08131 | 8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options, Voltage Reference, and Track/Hold Function(8位高速串行输入/输出A/D转换器带多路选择，电压基准和跟踪/保持功能) |
| ADC08134 | 8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options, Voltage Reference, and Track/Hold Function(8位高速串行输入/输出A/D转换器带多路选择，电压基准和跟踪/保持功能) |
| ADC08138 | 8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options, Voltage Reference, and Track/Hold Function(8位高速串行输入/输出A/D转换器带多路选择，电压基准和跟踪/保持功能) |
| ADC081500 | High Performance, Low Power, 8-Bit, 1.5 GSPS A/D Converter |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADC08138CIWM/NOPB | 制造商:Texas Instruments 功能描述:ADC Single SAR 8-bit Serial 20-Pin SOIC W |
| ADC08138CIWMX | 功能描述:IC ADC 8BIT HS SERIAL I/O 20SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| ADC08138CIWMX/NOPB | 制造商:Texas Instruments 功能描述:ADC Single SAR 8-bit Serial 20-Pin SOIC W T/R |
| ADC08138CMJ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Single-Ended Data Acquisition System |
| ADC081500 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Performance, Low Power, 8-Bit, 1.5 GSPS A/D Converter |
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