AD680AR-REEL

更新时间： 2024-01-04 05:40:29

品牌	Logo	应用领域
亚德诺 - ADI		电源电路参考电压源光电二极管
页数	文件大小	规格书
12页	399K
描述
Low Power, Low Cost 2.5 V Reference

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技术参数
数据手册

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AD680AR-REEL 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TO-92
包装说明：	, SIP3,.1,50	针数：	3
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	1.49
模拟集成电路 - 其他类型：	THREE TERMINAL VOLTAGE REFERENCE	JESD-30 代码：	O-MBCY-W3
JESD-609代码：	e3	湿度敏感等级：	1
功能数量：	1	输出次数：	1
端子数量：	3	最高工作温度：	70 °C
最低工作温度：		最大输出电压：	2.51 V
最小输出电压：	2.49 V	标称输出电压：	2.5 V
封装主体材料：	METAL	封装等效代码：	SIP3,.1,50
封装形状：	ROUND	封装形式：	CYLINDRICAL
峰值回流温度（摄氏度）：	260	认证状态：	Not Qualified
子类别：	Voltage References	最大供电电流 (Isup)：	0.28 mA
最大供电电压 (Vsup)：	36 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	NO
技术：	BIPOLAR	最大电压温度系数：	30 ppm/ °C
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	WIRE	端子节距：	1.27 mm
端子位置：	BOTTOM	处于峰值回流温度下的最长时间：	40
微调/可调输出：	NO	最大电压容差：	0.4%
Base Number Matches：	1

AD680AR-REEL 数据手册

AD680

THEORY OF OPERATION

Band gap references are the high performance solution for low

supply voltage operation. A typical precision band gap consists

of a reference core and buffer amplifier. Based on a new, pat-

ented band gap reference design (Figure 5), the AD680 merges

the amplifier and the core band gap function to produce a

compact, complete precision reference.

Reference outputs are frequently required to handle fast

transients caused by input switching networks, commonly

found in ADCs and measurement instrumentation equipment.

Many of the dynamic problems associated with this situation

can be minimized with a few simple techniques. Using a series

resistor between the reference output and the load tends to

“decouple” the reference output from the transient source, or a

relatively large capacitor connected from the reference output to

ground can serve as a charge storage element to absorb and

deliver charge as required by the dynamic load. A 50 nF capaci-

tor is recommended for the AD680 in this case; this is large

enough to store the required charge, but small enough not to

disrupt the stability of the reference.

Central to the device is a high gain amplifier with an intentionally

large proportional to absolute temperature (PTAT) input offset.

This offset is controlled by the area ratio of the amplifier input

pair, Q1 and Q2, and is developed across Resistor R1. Transistor

Q12’s base emitter voltage has a complementary to absolute

temperature (CTAT) characteristic. Resistor R2 and the parallel

combination of Resistor R3 and Resistor R4 “multiply” the PTAT

voltage across the R1 resistor. Trimming the R3 and R4 resistors

to the proper ratio produces a temperature invariant of 2.5 V at

the output. The result is an accurate, stable output voltage

accomplished with a minimum number of components.

The 8-lead PDIP and 8-lead SOIC packaged versions of the

AD680 also provide a temperature output pin. The voltage on

this pin is nominally 596 mV at 25°C. This pin provides an

output linearly proportional to temperature with a

characteristic of 2 mV/°C.

NOISE PERFORMANCE

The noise generated by the AD680 is typically less than 8 μV p-p

over the 0.1 Hz to 10 Hz band. Figure 6 shows the 0.1 Hz to 10 Hz

noise of a typical AD680. The noise measurement is made with a

band-pass filter made of a 1-pole high-pass filter, with a corner

frequency at 0.1 Hz, and a 2-pole low-pass filter, with a corner

frequency at 12.6 Hz, to create a filter with a 9.922 Hz bandwidth.

Q11

OUT

Q10

Q12

100

TEMP

GND

5μV

Figure 5. Schematic Diagram

APPLYING THE AD680

The AD680 is simple to use in virtually all precision reference

applications. When power is applied to +V_INand the GND pin

is tied to ground, V_OUTprovides a 2.5 V output. The AD680

typically requires less than 250 μA of current when operating

from a supply of 4.5 V to 36 V.

Figure 6. 0.1 Hz to 10 Hz Noise

To operate the AD680, the +V_INpin must be bypassed to the

GND pin with a 0.1 μF capacitor tied as close to the AD680 as

possible. Although the ground current for the AD680 is small,

typically 195 μA, a direct connection should be made between

the AD680 GND pin and the system ground plane.

Noise in a 300 kHz bandwidth is approximately 800 μV p-p.

Figure 7 shows the broadband noise of a typical AD680.

Rev. H | Page 6 of 12

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

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与AD680AR-REEL相关器件

型号	品牌	描述	获取价格	数据表
AD680AR-REEL7	ROCHESTER	1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO8, PLASTIC, MO-012AA, SOIC-8	获取价格
AD680AR-REEL7	ADI	Low Power, Low Cost 2.5 V Reference	获取价格
AD680ARZ	ROCHESTER	1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO8, LEAD FREE, PLASTIC, MO-012AA, SOIC-8	获取价格
AD680ARZ1	ADI	Low Power, Low Cost 2.5 V Reference	获取价格
AD680ARZ-REEL	ADI	Low Power, Low Cost 2.5 V Reference	获取价格
AD680ARZ-REEL7	ROCHESTER	1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO8, LEAD FREE, PLASTIC, MO-012AA, SOIC-8	获取价格

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