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AD680AN

更新时间： 2024-02-03 14:30:34
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
8页 163K
描述
Low Power, Low Cost 2.5 V Reference

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AD680AN 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：compliantECCN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 REFERENCEJESD-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

AD680AN 数据手册

 浏览型号AD680AN的Datasheet PDF文件第2页浏览型号AD680AN的Datasheet PDF文件第3页浏览型号AD680AN的Datasheet PDF文件第4页浏览型号AD680AN的Datasheet PDF文件第5页浏览型号AD680AN的Datasheet PDF文件第6页浏览型号AD680AN的Datasheet PDF文件第8页 
AD680  
One such ADC that the AD680 is well suitcd for is the  
AD7701. Figure 12a shows the AD680 used as the reference for  
this converter. T he AD7701 is a 16-bit A/D converter with  
on-chip digital filtering intended for the measurement of wide  
dynamic range, low frequency signals such as those representing  
chemical, physical or biological processes. It contains a charge  
balancing (sigma-delta) ADC, calibration microcontroller with  
on-chip static RAM, a clock oscillator and a serial communica-  
tlons port.  
+4.5 V REFERENCE FRO M A +5 V SUP P LY  
T he AD680 can be used to provide a low power, +4.5 V refer-  
ence as shown in Figure 13. In addition to the AD680, the cir-  
cuit uses a low power op amp and a transistor in a feedback  
configuration that provides a regulated +4.5 V output for a  
power supply voltage as low as +4.7 V. T he high quality tanta-  
lum 10 µF capacitor (C1) in parallel with the ceramic 0.1 µF  
capacitor (C2) and the 3.9 Ω resistor (R5) ensure a low output  
impedance up to around 50 MHz.  
T his entire circuit runs on ±5 V supplies. T he power dissipation  
of the AD7701 is typically 25 mW and, when combined with  
the power dissipation of the AD680 (1 mW), the entire circuit  
consumes just 26 mW of power.  
+4.7V TO +15V  
CC  
3.3µF  
R3  
1k  
2N2907A  
+V  
IN  
7
+4.5V  
V
3
2
+IN  
OUT  
0.1µF  
+5V  
ANALOG  
SUPPLY  
V+  
+C1  
10µF  
C2  
0.1µF  
AD680  
OUT  
6
OP-90  
GND  
0.1µF  
10µF  
V–  
R4  
3.57k  
–IN  
4
R5  
3.9  
AV  
V
DD  
DV  
CF  
V
DD  
IN  
V
0.1µF  
OUT  
REF  
SLEEP  
MODE  
0.1µF  
0.1µF  
R1  
AD680  
R2  
2.5k  
1%  
GND  
2k 1%  
DATA READY  
DRDY  
AD7701  
READ (TRANSMIT)  
SERIAL CLOCK  
SERIAL DATA  
CS  
SCLK  
RANGE  
SELECT  
BP/UP  
CAL  
SDATA  
Figure 13. +4.5 V Reference Running from a Single +5 V  
Supply  
CALIBRATE  
CLKIN  
ANALOG  
INPUT  
A
IN  
CLKOUT  
SC1  
VO LTAGE REGULATO R FO R P O RTABLE EQ UIP MENT  
T he AD680 is ideal for providing a stable, low cost and low  
power reference voltage in portable equipment power supplies.  
Figure 14 shows how the AD680 can be used in a voltage regu-  
lator that not only has low output noise (as compared to a  
switchmode design) and low power, but also a very fast recovery  
after current surges. Some precaution should be taken in the  
selection of the output capacitors. T oo high an ESR (effective  
series resistance) could endanger the stability of the circuit. A  
solid tantalum capacitor, 16 V or higher, and an aluminum elec-  
trolytic capacitor, 10 V or higher, are recommended for C1 and  
C2, respectively. Also, the path from the ground side of C1 and  
C2 to the ground side of R1 should be kept as short as possible.  
ANALOG  
GROUND  
AGND  
SC2  
0.1µF  
DGND  
AV  
SS  
0.1µF  
DV  
SS  
–5V  
ANALOG  
SUPPLY  
10µF  
0.1µF  
Figure 12a. Low Power, Low Voltage Supply Reference  
for the AD7701 16-Bit A/D Converter  
Figure 12b shows the AD680 connected to the AD773 high  
speed 8-bit ADC. T he low pass filter shown minimizes the  
AD680’s wideband noise.  
CHARGER  
INPUT  
2
0.1µF  
V
IN  
2
510kΩ  
AD680  
22Ω  
10µF  
V
IN  
OUT  
6
2
1
V
OUT  
R3  
REF IN  
V
2
3
6
3
7
6V  
0.1µF  
+
IRF9530  
AD680  
TEMP  
6
LEAD-ACID  
BATTERY  
GND  
AD773  
4
OP-20  
4
GND  
4
REF GND  
+5V, 1A  
R2  
+
+
68µF  
TANT  
C1  
402kΩ  
1%  
1000µF  
ELECT  
C2  
402kΩ  
1%  
R1  
Figure 12b. AD680 to AD773 Connection  
T he AD773’s high impedance reference input allows direct con-  
nection to the AD680. Unlike the resistor ladder requirements  
of a flash converter the AD773’s single pin, high impedance in-  
put can be driven from one low cost, low power reference. T he  
high impedance input allows multiple AD773’s to be driven  
from one AD680 thus minimizing drift errors.  
Figure 14. Voltage Regulator for Portable Equipm ent  
REV. C  
–7–  
1...45678

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