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| 型号： | AD8674ARZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 10MHZ QUAD LN 14SOIC |
| 产品变化通告： | AD8674 Datasheet Specification Change 25/Nov/2009 |
| 标准包装： | 1,000 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 转换速率： | 4 V/µs |
| 增益带宽积： | 10MHz |
| 电流 - 输入偏压： | 3nA |
| 电压 - 输入偏移： | 20µV |
| 电流 - 电源： | 3mA |
| 电流 - 输出 / 通道： | 20mA |
| 电压 - 电源，单路/双路(±)： | 10 V ~ 36 V，±5 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
Data Sheet
AD8671/AD8672/AD8674
Rev. F | Page 11 of 20
APPLICATIONS
POWER DISSIPATION CALCULATIONS
To achieve low voltage noise in a bipolar op amp, the current
must be increased. The emitter-base theoretical voltage noise is
approximately
Hz
nV/
2
109
C
n
qI
kT
e =
To achieve the low voltage noise of 2.8 nV/√Hz, the input stage
current is higher than most op amps with an equivalent gain
bandwidth product. The thermal noise of a 1 kΩ resistor is
4 nV/√Hz, which is higher than the voltage noise of AD8671
family. Low voltage noise requires using low values of resistors,
so low voltage noise op amps should have good drive capability,
such as a 600 Ω load. This means that the second stage and
output stage are also biased at higher currents. As a result, the
supply current of a single op amp is 3.5 mA maximum at room
temperature.
Junction temperature has a direct affect on reliability. For more
information, visit the following Analog Devices, Inc., website:
MTTF and FIT calculations can be done based on the junction
temperature and IC process. Use the following equation to
determine the junction temperature:
TJ = TA + PD × θJA
For the AD8671 single in the 8-lead MSOP package, the thermal
resistance, θJA, is 142°C/W. If the ambient temperature is 30°C
and the supply voltages are ±12 V, the power dissipation is
24 V × 3.5 mA = 84 mW
Therefore, the rise above ambient temperature is
84 mW × 142°C/W = 12°C
If the ambient temperature is 30°C, the junction temperature is
42°C. The previously mentioned website that details the effect
of the junction temperature on reliability has a calculator that
requires only the part number and the junction temperature to
determine the process technology.
For the AD8674 single in the 14-Lead TSSOP package, the thermal
resistance, θJA, is 112°C/W. Although θJA is lower than it is for the
8-lead package, the four op amps are powered simultaneously. If
the ambient temperature is 50°C and the supply voltages are ±15 V,
the power dissipation is
30 V × 4.2 mA × four op amps = 504 mW
Therefore, the rise above ambient temperature is
504 mW × 112°C/W = 56°C
With an ambient temperature of 50°C, the junction temperature
is 106°C. This is less than the specified absolute maximum junction
temperature, but for systems with long product lifetimes (years),
this should be considered carefully.
Note that these calculations do not include the additional
dissipation caused by the load current on each op amp. Possible
solutions to reduce junction temperature include system level
considerations such as fans, Peltier thermoelectric coolers, and
heat pipes. Board considerations include operation on lower
voltages, such as ±12 V or ±5 V, and using two dual op amps
instead of one quad op amp. If the extremely low voltage noise
and high gain bandwidth is not required, using other quad op
AD704 can be considered.
UNITY-GAIN FOLLOWER APPLICATIONS
When large transient pulses (>1 V) are applied at the positive
terminal of amplifiers (such as the OP27, LT1007, OPA227, and
AD8671) with back-to-back diodes at the input stage, the use of
a resistor in the feedback loop is recommended to avoid having
the amplifier load the signal generator. The feedback resistor,
RF, should be at least 500 . However, if large values must be
used for RF, a small capacitor, CF, should be inserted in parallel
with RF to compensate for the pole introduced by the input
capacitance and RF.
Figure 30 shows the uncompensated output response with a
10 k resistor in the feedback and the compensated response
with CF = 15 pF.
03718-B-032
REF1 +OVER
23.23%
CH2 +OVER
7.885%
V
OLTA
GE
(
1
V
/D
IV
)
OUTPUT UNCOMPENSATED
OUTPUT
COMPENSATED
TIME (100ns/DIV)
Figure 30. Transient Output Response
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8674ARZ-REEL7-MOOG | 制造商:Analog Devices 功能描述: |
| AD8675 | 制造商:AD 制造商全称:Analog Devices 功能描述:36 V Precision, 2.8 nV/☆Hz Rail-to-Rail Output Op Amp |
| AD8675_07 | 制造商:AD 制造商全称:Analog Devices 功能描述:36 V Precision, 2.8 nV/☆Hz Rail-to-Rail Output Op Amp |
| AD8675ARMZ | 功能描述:IC OPAMP GP R-R 10MHZ PREC 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| AD8675ARMZ-R2 | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R O/P 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC |
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