DAC1218

更新时间： 2024-01-01 03:40:59

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器
页数	文件大小	规格书
12页	229K
描述
12-Bit Binary Multiplying D/A Converter

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技术参数
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DAC1218 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	DIP, DIP18,.3	Reach Compliance Code：	unknown
风险等级：	5.92	转换器类型：	D/A CONVERTER
JESD-30 代码：	R-XDIP-T18	JESD-609代码：	e0
最大线性误差 (EL)：	0.012%	位数：	12
功能数量：	1	端子数量：	18
最高工作温度：	125 °C	最低工作温度：	-55 °C
封装主体材料：	CERAMIC	封装代码：	DIP
封装等效代码：	DIP18,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	认证状态：	Not Qualified
子类别：	Other Converters	表面贴装：	NO
技术：	CMOS	温度等级：	MILITARY
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL

DAC1218 数据手册

Application Hints (Continued)

A12

e b

. . .

OUT

REF

4096

where: AN 1 if digital input is high

TL/H/5691–5

AN 0 if digital input is low

FIGURE 2. Unipolar Output Voltage

TL/H/5691–6

FIGURE 3. Zeroing an Amplifier Which Does Not Have Balancing Provisions

The selected amplifier should have as low an input bias

2.3 Output Settling Time

current as possible since input bias current contributes to

the current flowing through the feedback resistor. BI-FET^TM

op amps such as the LF356 or LF351 or bipolar op amps

with super b input transistors like the LM11 or LM308A pro-

duce negligible errors.

The output voltage settling time for this circuit in response

to a change of the digital input code (a full-scale change is

the worst case) is a combination of the DAC’s output current

settling characteristics and the settling characteristics of the

output amplifier. The amplifier settling is further degraded by

a feedback pole formed by the feedback resistance and the

DAC output capacitance (which varies with the digital code).

First order compensation for this pole is achieved by adding

2.2 Zero and Full-Scale Adjustments

The fundamental purpose is to make the output voltages as

near 0 V

as possible. This is accomplished in the circuit

of Figure 2 by shorting out the amplifier feedback resist-

ance, and adjusting the V nulling potentiometer of the op

a feedback zero with capacitor C shown in Figure 2.

In many applications output response time and settling is

just as important as accuracy. It can be difficult to find a

single op amp that combines excellent DC characteristics

amp until the output reads zero volts. This is done, of

course, with an applied digital input of all zeros if I is

OUT1

). The feedback short

(low V , V drift and bias current) with fast response and

OS OS

driving the op amp (all ones for I

OUT2

is then removed and the converter is zero adjusted.

settling time. BI-FET op amps offer a reasonable compro-

mise of high speed and good DC characteristics. The circuit

of Figure 4 illustrates a composite amplifier connection that

combines the speed of a BI-FET LF351 with the excellent

DC input characteristics of the LM11. If output settling time

is not so critical, the LM11 can be used alone.

A unique characteristic of these DACs is that any full-scale

or gain error is always negative. This means that for a full-

scale input code the output voltage, if not inherently correct,

will always be less than what it should be. This ensures that

adding an appropriate resistance in series with the internal

Figure 5 is a settling time test circuit for the complete volt-

age output DAC circuit. The circuit allows the settling time of

the DAC amplifier to be measured to a resolution of 1 mV

feedback resistor, R , will always correct for any gain error.

The 50X potentiometer in Figure 2 is all that is needed to

adjust the worst case DAC gain error.

out of a zero to 10V full-scale output change on an oscil-

Conversion accuracy is only as good as the applied refer-

ence voltage, so providing a source that is stable over time

and temperature is important.

loscope. Figure 6 summarizes the measured settling times

for several output amplifiers and feedback compensation

capacitors.

1...3 4 567 8 9...12

中文翻译

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与DAC1218相关器件

型号	品牌	获取价格	描述	数据表
DAC1218LCD	ETC	获取价格	12-Bit Digital-to-Analog Converter
DAC1218LCD/A+	TI	获取价格	IC,D/A CONVERTER,SINGLE,12-BIT,CMOS,DIP,18PIN
DAC1218LCD-1	TI	获取价格	IC,D/A CONVERTER,SINGLE,12-BIT,CMOS,DIP,18PIN
DAC1218LCJ	NSC	获取价格	12-Bit Binary Multiplying D/A Converter
DAC1218LCJ/A+	ETC	获取价格	12-Bit Digital-to-Analog Converter
DAC1218LCJ-1	NSC	获取价格	12-Bit Binary Multiplying D/A Converter
DAC1218LD/883	TI	获取价格	IC,D/A CONVERTER,SINGLE,12-BIT,CMOS,DIP,18PIN
DAC1218LD/883B	TI	获取价格	IC,D/A CONVERTER,SINGLE,12-BIT,CMOS,DIP,18PIN
DAC1218LD/883C	TI	获取价格	IC,D/A CONVERTER,SINGLE,12-BIT,CMOS,DIP,18PIN
DAC1219	NSC	获取价格	12-Bit Binary Multiplying D/A Converter

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