AD688SQ

更新时间： 2024-01-25 07:34:24

品牌	Logo	应用领域
亚德诺 - ADI		电源电路参考电压源输出元件
页数	文件大小	规格书
8页	408K
描述
High Precision +-10 V Reference

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数据手册

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AD688SQ 技术参数

生命周期：	Active	零件包装代码：	DIP
包装说明：	DIP,	针数：	16
Reach Compliance Code：	unknown	风险等级：	5.76
Is Samacsys：	N	其他特性：	-10V OUTPUT ALSO AVAILABLE, -13.5V TO -18V SUPPLY IS ALSO REQUIRED
模拟集成电路 - 其他类型：	THREE TERMINAL VOLTAGE REFERENCE	JESD-30 代码：	R-GDIP-T16
长度：	19.05 mm	功能数量：	1
输出次数：	2	端子数量：	16
最高工作温度：	125 °C	最低工作温度：	-55 °C
最大输出电压：	10.005 V	最小输出电压：	9.995 V
标称输出电压：	10 V	封装主体材料：	CERAMIC, GLASS-SEALED
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	认证状态：	COMMERCIAL
座面最大高度：	5.08 mm	最大供电电压 (Vsup)：	18 V
最小供电电压 (Vsup)：	13.5 V	标称供电电压 (Vsup)：	15 V
表面贴装：	NO	最大电压温度系数：	6 ppm/ °C
温度等级：	MILITARY	端子面层：	NOT SPECIFIED
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	微调/可调输出：	NO
宽度：	7.62 mm	Base Number Matches：	1

AD688SQ 数据手册

AD688

APPLYING THE AD688

20 V between Pins 1 and 15, the amplifier outputs. The BAL-

ANCE potentiometer, also connected between Pins 6 and 8

with the wiper to Pin 12 (BAL ADJ), is then adjusted to center

the span from +10 V to –10 V.

The AD688 can be configured to provide ±10 V reference out-

puts as shown in Figure 2a. The architecture of the AD688 pro-

vides ground sense and uncommitted output buffer amplifiers

which offer the user a great deal of functional flexibility. The

AD688 is specified and tested in the configuration shown in

Figure 2a. The user may choose to take advantage of other

configuration options available with the AD688; however

performance in these configurations is not guaranteed to meet

the stringent data sheet specifications.

Input impedance on both the GAIN ADJUST and the BAL-

ANCE ADJUST pins is approximately 150 kΩ. The GAIN

ADJUST trim network effectively attenuates the 20 V across the

trim potentiometer by a factor of about 1150 to provide a trim

range of –5.8 mV to + 12.0 mV with a resolution of approxi-

mately 900 µV/turn (20 turn potentiometer). The BALANCE

ADJUST trim network attenuates the trim voltage by a factor of

about 1250, providing a trim range of ±8 mV with a resolution

of 800 µV/turn.

Unbuffered outputs are available at Pins 6 and 8. Loading of

these unbuffered outputs will impair circuit performance.

Amplifiers A3 and A4 can be used interchangeably. However,

the AD688 is tested (and the specifications are guaranteed) with

the amplifiers connected as indicated in Figure 2a. When either

A3 or A4 is unused, its output force and sense pins should be

connected and the input tied to ground.

Trimming the AD688 introduces no additional errors over

temperature, so precision potentiometers are not required.

In cases when BALANCE ADJUST is not necessary, Pin 12

should be left floating. If GAIN ADJUST is not required, Pin 5

should also be left floating.

Two outputs of the same voltage polarity may be obtained by

connecting both A3 and A4 to the appropriate unbuffered out-

put on Pin 6 or 8. Performance in these dual output configura-

tions will typically meet data sheet specifications.

Figure 2a. +10 V and –10 V Outputs

CALIBRATION

Figure 2b. Gain and Balance Adjust with Noise Reduction

Generally, the AD688 will meet the requirements of a precision

system without additional adjustment. Initial output voltage

error of 2 mV and output noise specs of 6 µV p-p allow for

accuracies of 12-16 bits. However, in applications where an

even greater level of accuracy is required, additional calibration

may be called for. The provision for trimming has been made

through the use of the GAIN ADJUST and BALANCE

ADJUST pins (Pins 5 and 12, respectively).

NOISE PERFORMANCE AND REDUCTION

The noise generated by the AD688 is typically less than 6 µV

p-p over the 0.1 Hz to 10 Hz band. Noise in a 1 MHz

bandwidth is approximately 840 µV p-p. The dominant source

of this noise is the buried Zener which contributes approxi-

mately 140 nV/√Hz. In comparison, the op amp’s contribution

is negligible. Figure 3 shows the 0.1 Hz to 10 Hz noise of a

typical AD688.

The AD688 provides a precision 20 V span with a center tap

which is used with the buffer and ground sense amplifiers to

achieve the ±10 V output configuration. The GAIN ADJUST

and BALANCE ADJUST can be used to trim the magnitude of

the 20 V span voltage and the position of the center tap within

the span. The GAIN ADJUST should be performed first. Al-

though the trims are not interactive within the device, the GAIN

trim will move the BALANCE trim point as it changes the

magnitude of the span.

Figure 2b shows the GAIN and BALANCE trims of the

AD688. A 100 kΩ 20-turn potentiometer is used for each trim.

The potentiometer for the GAIN trim is connected between

Pins 6 (V_HIGH) and 8 (V_LOW) with the wiper connected to Pin 5

(GAIN ADJ). The potentiometer is adjusted to produce exactly

Figure 3. 0.1 Hz to 10 Hz Noise

–4–

REV. A

1 2 345 6 7 8

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