参数资料
| 型号： | AD420AR-32 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC DAC SRL 16BIT 24-SOIC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 31 |
| 设置时间： | 2.5µs |
| 位数： | 16 |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 176mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 输出数目和类型： | 2 电流，双极 |
| 采样率（每秒）： | 400 |
Serial Input 16-Bit
4 mA–20 mA, 0 mA–20 mA DAC
AD420
Rev. H
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responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
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1999–2011 Analog Devices, Inc. All rights reserved.
FEATURES
4 mA–20 mA, 0 mA–20 mA or 0 mA–24 mA
current output
16-bit resolution and monotonicity
±0.012% max integral nonlinearity
±0.05% max offset (trimmable)
±0.15% max total output error (trimmable)
Flexible serial digital interface (3.3 MBPS)
On-Chip loop fault detection
On-chip 5 V reference (25 ppm/°C max)
Asynchronous CLEAR function
Maximum power supply range of 32 V
Output loop compliance of 0 V to VCC 2.75 V
24-Lead SOIC and PDIP packages
FUNCTIONAL BLOCK DIAGRAM
FAULT
DETECT
IOUT
BOOST
40
1.25k
4k
VOUT
OFFSET
TRIM
CAP 1 CAP 2
GND
VLL
VCC
REF OUT
REF IN
DATA OUT
CLEAR
LATCH
CLOCK
DATA IN
RANGE
SELECT 1
RANGE
SELECT 2
AD420
REFERENCE
DATA I/P
REGISTER
SWITCHED
CURRENT
SOURCES
AND
FILTERING
CLOCK
16-BIT
DAC
00
49
4-
00
1
Figure 1.
GENERAL DESCRIPTION
The AD420 is a complete digital to current loop output
converter, designed to meet the needs of the industrial control
market. It provides a high precision, fully integrated, low cost
single-chip solution for generating current loop signals in a
compact 24-lead SOIC or PDIP package.
The output current range can be programmed to 4 mA to
20 mA, 0 mA to 20 mA or to an overrange function of 0 mA to
24 mA. The AD420 can alternatively provide a voltage output from
a separate pin that can be configured to provide 0 V to 5 V, 0 V
to 10 V, ±5 V, or ±10 V with the addition of a single external
buffer amplifier.
The 3.3 M Baud serial input logic design minimizes the cost of
galvanic isolation and allows for simple connection to commonly
used microprocessors. It can be used in 3-wire or asynchronous
mode and a serial-out pin is provided to allow daisy chaining of
multiple DACs on the current loop side of the isolation barrier.
The AD420 uses sigma-delta (Σ-Δ) DAC technology to achieve
16-bit monotonicity at very low cost. Full-scale settling to 0.1%
occurs within 3 ms. The only external components that are
required (in addition to normal transient protection circuitry)
are two low cost capacitors which are used in the DAC out-
put filter.
If the AD420 is used at extreme temperatures and supply
voltages, an external output transistor can be used to minimize
power dissipation on the chip via the BOOST pin. The FAULT
DETECT pin signals when an open circuit occurs in the loop.
The on-chip voltage reference can be used to supply a precision
+5 V to external components in addition to the AD420 or, if the
user desires temperature stability exceeding 25 ppm/°C, an
external precision reference such as the AD586 can be used as
the reference. The AD420 is available in a 24-lead SOIC and
PDIP over the industrial temperature range of 40°C to +85°C.
PRODUCT HIGHLIGHTS
1.
The AD420 is a single chip solution for generating 4 mA to
20 mA or 0 mA to 20 mA signals at the controller end of
the current loop.
2.
The AD420 is specified with a power supply range from
12 V to 32 V. Output loop compliance is 0 V to VCC 2.75 V.
3.
The flexible serial input can be used in 3-wire mode
with SPI or MICROWIRE microcontrollers, or in
asynchronous mode, which minimizes the number of
control signals required.
4.
The serial data out pin can be used to daisy chain any
number of AD420s together in 3-wire mode.
5.
At power-up, the AD420 initializes its output to the low
end of the selected range.
6.
The AD420 has an asynchronous CLEAR pin, which sends
the output to the low end of the selected range (0 mA, 4 mA,
or 0 V).
7.
The AD420 BOOST pin accommodates an external
transistor to off-load power dissipation from the chip.
8.
The offset of ±0.05% and total output error of ±0.15% can
be trimmed if desired, using two external potentiometers.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD420AR-32 | 制造商:Analog Devices 功能描述:SEMICONDUCTORSLINEAR |
| AD420AR-32-REEL | 功能描述:IC DAC SNGL 16BIT 24-SOIC T/R RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD420ARZ-32 | 功能描述:IC DAC SRL 16BIT 24-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 设置时间:4µs 位数:12 数据接口:串行 转换器数目:2 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-uMAX 包装:管件 输出数目和类型:2 电压，单极 采样率（每秒）:* 产品目录页面:1398 (CN2011-ZH PDF) |
| AD420ARZ-32-REEL | 功能描述:IC DAC SERIAL INPUT 16BIT 24SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD421 | 制造商:AD 制造商全称:Analog Devices 功能描述:Loop-Powered 4 mA to 20 mA DAC |
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