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DAC9881 PDF预览

DAC9881

更新时间: 2024-11-25 04:14:07
品牌 Logo 应用领域
德州仪器 - TI 转换器
页数 文件大小 规格书
38页 1433K
描述
18-Bit, Single-Channel, Low-Noise, Voltage-Output DIGITAL-TO-ANALOG CONVERTER

DAC9881 数据手册

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DAC9881  
www.ti.com ......................................................................................................................................................... SBAS438AMAY 2008REVISED AUGUST 2008  
18-Bit, Single-Channel, Low-Noise, Voltage-Output  
DIGITAL-TO-ANALOG CONVERTER  
1
FEATURES  
DESCRIPTION  
234  
18-Bit Monotonic Over Temperature Range  
Relative Accuracy: ±2LSB Max  
Low-Noise: 24nV/Hz  
The DAC9881 is an 18-bit, single-channel,  
voltage-output digital-to-analog converter (DAC). It  
features 18-bit monotonicity, excellent linearity, very  
low-noise, and fast settling time. The on-chip  
precision output amplifier allows rail-to-rail output  
swing to be achieved over the full supply range of  
2.7V to 5.5V.  
Fast Settling: 5µs  
On-Chip Output Buffer Amplifier with  
Rail-to-Rail Operation  
Single Power Supply: +2.7V to +5.5V  
DAC Loading Control  
The device supports a standard SPI serial interface  
capable of operating with input data clock frequencies  
up to 50MHz. The DAC9881 requires an external  
reference voltage to set the output range of the DAC  
channel. A programmable power-on reset circuit is  
also incorporated into the device to ensure that the  
DAC output powers up at zero-scale or midscale, and  
remains there until a valid write command.  
Selectable Power-On Reset to Zero-Scale or  
Midscale  
Power-Down Mode  
Unipolar Straight Binary or  
Twos Complement Input Mode  
Additionally, the DAC9881 has the capability to  
function in either unipolar straight binary or twos  
complement mode. The DAC9881 provides  
low-power operation. To further save energy,  
power-down mode can be achieved by accessing the  
PDN pin, thereby reducing the current consumption to  
25µA at 5V. Power consumption is 4mW at 5V,  
reducing to 125µW in power-down mode.  
Fast SPI™ Interface with Schmitt-Triggered  
Inputs: up to 50MHz, 1.8V/3V/5V Logic  
Small Package: QFN-24, 4mm × 4mm  
APPLICATIONS  
Automatic Test Equipment  
Precision Instrumentation  
Industrial Control  
The DAC9881 is available in a 4mm × 4mm QFN-24  
package with a specified temperature range of –40°C  
to +105°C.  
Data Acquisition Systems  
DGND  
IOVDD  
AGND  
AVDD  
VREFH-S VREFH-F  
DAC9881  
RST  
RSTSEL  
USB/BTC  
GAIN  
Power-On  
Reset  
Control  
Logic  
Resistor  
Network  
SDI  
CS  
PDN  
VOUT  
RFB  
SCLK  
Input  
Register  
DAC  
Latch  
DAC  
(1)  
RFB  
SDOSEL  
Serial Out  
Control  
NOTE: (1) RFB = 5kW for gain = 1,  
RFB = 10kW for gain = 2.  
SDO  
LDAC  
VREFL-S  
VREFL-F  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
3
4
SPI, QSPI are trademarks of Motorola, Inc.  
MICROWIRE is a trademark of National Semiconductor.  
All other trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2008, Texas Instruments Incorporated  

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适用于高精度应用的 18 位、单通道、低噪声电压输出 DAC | RGE | 24 | -