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參數資料
| 型號： | AD7249BRZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS Dual 12-Bit Serial DACPORT |
| 中文描述： | DUAL, SERIAL INPUT LOADING, 5 us SETTLING TIME, 12-BIT DAC, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 149K |
| 代理商： | AD7249BRZ |
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
LC2MOS
Dual 12-Bit Serial DACPORT
AD7249
GENERAL DESCRIPTION
The AD7249 DACPORT contains a pair of 12-bit, voltage-
output, digital-to-analog converters with output amplifiers and
Zener voltage reference on a monolithic CMOS chip. No exter-
nal trims are required to achieve full specified performance.
The output amplifiers are capable of developing +10 V across a
2 k
load. The output voltage ranges with single supply opera-
tion are 0 V to +5 V or 0 V to +10 V, while an additional bipolar
±5 V output range is available with dual supplies. The ranges
are selected using the internal gain resistor.
Interfacing to the AD7249 is serial, minimizing pin count and
allowing a small package size. Standard control signals allow
interfacing to most DSP processors and microcontrollers. The
data stream consists of 16 bits, DB15 to DB13 are don’t care
bits, the 13th bit (DB12) is used as the channel select bit and
the remaining 12 bits (DB11 to DB0) contain the data to update
the DAC. The 16-bit data word is clocked into the input register
on each falling SCLK edge.
The data format is natural binary in both unipolar ranges, while
either offset binary or twos complement format may be selected
in the bipolar range. A
CLR function is provided which sets the
output to 0 V in both unipolar ranges and in the twos comple-
ment bipolar range, while with offset binary data format, the
output is set to –REFIN. This function is useful as a power-on
reset as it allows the outputs to be set to a known voltage level.
The AD7249 features a serial interface which allows easy con-
nection to both microcomputers and 16-bit digital signal proces-
sors with serial ports. The serial data may be applied at rates up
to 2 MHz allowing a DAC update rate of 125 kHz.
The AD7249 is fabricated on linear compatible CMOS
(LC
2MOS), an advanced, mixed technology process. It is pack-
aged in 16-lead DIP and 16-lead SOIC packages.
PRODUCT HIGHLIGHTS
1. Two complete 12-bit DACPORTs
The AD7249 contains two complete voltage output, 12-bit
DACs in both 16-lead DIP and SOIC packages.
2. Single or dual supply operation
3. Minimum 3-wire interface to most DSP processors
4. DAC update rate—125 kHz
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Two 12-Bit CMOS DAC Channels with
On-Chip Voltage Reference
Output Amplifiers
Three Selectable Output Ranges per Channel
–5 V to +5 V, 0 V to +5 V, 0 V to +10 V
Serial Interface
125 kHz DAC Update Rate
Small Size: 16-Lead DIP or SOIC
Low Power Dissipation
APPLICATIONS
Process Control
Industrial Automation
Digital Signal Processing Systems
Input/Output Ports
DACPORT is a registered trademark of Analog Devices, Inc.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2000
12-BIT
DAC A
12-BIT
DAC B
A2
A1
INPUT SHIFT REGISTER
AD7249
2R
VDD
VSS
REFOUT
REFIN
AGND
DGND
ROFSA
VOUTA
ROFSB
VOUTB
SCLK
SDIN
BIN/COMP CLR
LDAC
SYNC
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| AD7249BRZ-REEL | 功能描述:IC DAC 12BIT SRL W/REF 16SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:DACPORT® 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數:16 數據接口:并聯 轉換器數目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應商設備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
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