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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： | 8/26页 |
| 文件大小： | 1097K |
| 代理商： | DAC5672AIPFBRG4 |
APPLICATION INFORMATION
Theory of Operation
DAC Transfer Function
I
OUTFS +
I
OUT1 )
I
OUT2
(1)
I
OUT1 +
I
OUTFS
Code
16384
(2)
16383 - Code
I
= I
x
OUT2
OUTFS
16384
÷
÷
÷
è
(3)
I
OUTFS +
32
I
REF +
32
V
REF
R
SET
(4)
V
OUT1 +
I
OUT1
R
LOAD
(5)
V
OUT2 +
I
OUT2
R
LOAD
(6)
SLAS528A – SEPTEMBER 2007 – REVISED MAY 2009................................................................................................................................................... www.ti.com
The architecture of the DAC5672A uses a current steering technique to enable fast switching and high update
rate. The core element within the monolithic DAC is an array of segmented current sources that are designed to
deliver a full-scale output current of up to 20 mA. An internal decoder addresses the differential current switches
each time the DAC is updated and a corresponding output current is formed by steering all currents to either
output summing node, IOUT1 or IOUT2. The complementary outputs deliver a differential output signal, which
improves the dynamic performance through reduction of even-order harmonics, common-mode signals (noise),
and double the peak-to-peak output signal swing by a factor of two, as compared to single-ended operation.
The segmented architecture results in a significant reduction of the glitch energy and improves the dynamic
performance (SFDR) and DNL. The current outputs maintain a very high output impedance of greater
than 300 k
.
When pin 42 (GSET) is high (simultaneous gain set mode), the full-scale output current for both DACs is
determined by the ratio of the internal reference voltage (1.2 V) and an external resistor (RSET) connected to
BIASJ_A. When GSET is low (independent gain set mode), the full-scale output current for each DAC is
determined by the ratio of the internal reference voltage (1.2 V) and separate external resistors (RSET) connected
to BIASJ_A and BIASJ_B. The resulting IREF is internally multiplied by a factor of 32 to produce an effective DAC
output current that can range from 2 mA to 20 mA, depending on the value of RSET.
The DAC5672A is split into a digital and an analog portion, each of which is powered through its own supply pin.
The digital section includes edge-triggered input latches and the decoder logic, while the analog section
comprises both the current source array with its associated switches, and the reference circuitry.
Each of the DACs in the DAC5672A has a set of complementary current outputs, IOUT1 and IOUT2. The
full-scale output current, IOUTFS, is the summation of the two complementary output currents:
The individual output currents depend on the DAC code and can be expressed as:
where Code is the decimal representation of the DAC data input word. Additionally, I(OUTFS) is a function of the
reference current IREF, which is determined by the reference voltage and the external setting resistor (RSET).
In most cases, the complementary outputs drive resistive loads or a terminated transformer. A signal voltage
develops at each output according to:
The value of the load resistance is limited by the output compliance specification of the DAC5672A. To maintain
specified linearity performance, the voltage for IOUT1 and IOUT2 must not exceed the maximum allowable
compliance range.
16
Copyright 2007–2009, Texas Instruments Incorporated
Product Folder Link(s): DAC5672A
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相关代理商/技术参数 |
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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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