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参数资料
| 型号： | DAC5672AIPFBRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | DUAL, PARALLEL, WORD INPUT LOADING, 0.02 us SETTLING TIME, 14-BIT DAC, PQFP48 |
| 封装： | GREEN, PLASTIC, TQFP-48 |
| 文件页数： | 11/26页 |
| 文件大小： | 1097K |
| 代理商： | DAC5672AIPFBRG4 |
Single-Ended Configuration
IOUT1
IOUT2
50
25
RLOAD
50
AGND
Reference Operation
Internal Reference
I
OUTFS +
32
I
REF +
32
V
REF
R
SET
(9)
External Reference
www.ti.com................................................................................................................................................... SLAS528A – SEPTEMBER 2007 – REVISED MAY 2009
Figure 24 shows the single-ended output configuration, where the output current IOUT1 flows into an equivalent
load resistance of 25
. Node IOUT2 must be connected to AGND or terminated with a resistor of 25 to
AGND. The nominal resistor load of 25
gives a differential output swing of 1 VPP when applying a 20-mA
full-scale output current.
Figure 24. Driving a Doubly-Terminated 50-
Cable Using a Single-Ended Output
The DAC5672A has an on-chip reference circuit which comprises a 1.2-V bandgap reference and two control
amplifiers, one for each DAC. The full-scale output current, IOUTFS, of the DAC5672A is determined by the
reference voltage, VREF, and the value of resistor RSET. I(OUTFS) is calculated by:
The reference control amplifier operates as a V-to-I converter producing a reference current, IREF, which is
determined by the ratio of VREF and RSET (see Equation 9). The full-scale output current, I(OUTFS), results from
multiplying IREF by a fixed factor of 32.
Using the internal reference, a 2-k
resistor value results in a full-scale output of approximately 20 mA. Resistors
with a tolerance of 1% or better should be considered. Selecting higher values, the output current can be
adjusted from 20 mA down to 2 mA. Operating the DAC5672A at lower than 20-mA output currents may be
desirable for reasons of reducing the total power consumption, improving the distortion performance, or
observing the output compliance voltage limitations for a given load condition.
It is recommended to bypass the EXTIO pin with a ceramic chip capacitor of 0.1
F or more. The control
amplifier is internally compensated and its small signal bandwidth is approximately 300 kHz.
The internal reference can be disabled by simply applying an external reference voltage into the EXTIO pin,
which in this case functions as an input. The use of an external reference may be considered for applications that
require higher accuracy and drift performance or to add the ability of dynamic gain control.
While a 0.1-
F capacitor is recommended to be used with the internal reference, it is optional for the external
reference operation. The reference input, EXTIO, has a high input impedance (1 M
) and can easily be driven
by various sources. Note that the voltage range of the external reference must stay within the compliance range
of the reference input.
Copyright 2007–2009, Texas Instruments Incorporated
19
Product Folder Link(s): DAC5672A
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相关代理商/技术参数 |
参数描述 |
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| DAC5672-EP | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL 14-BIT 200-MSPS DIGITAL-TO-ANALOG CONVERTER |
| DAC5672EVM | 功能描述:数据转换 IC 开发工具 DAC5672 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| DAC5672IPFB | 功能描述:数模转换器- DAC Digital to Analog Converter RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC5672IPFB | 制造商:Texas Instruments 功能描述:IC DAC 14BIT 275MSPS 制造商:Texas Instruments 功能描述:IC, DAC, 14BIT, 275MSPS, TQFP-48 |
| DAC5672IPFBG4 | 功能描述:数模转换器- DAC Digital to Analog Converter RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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