参数资料
型号: ADA4638-1ARZ-R7
厂商: Analog Devices Inc
文件页数: 9/25页
文件大小: 0K
描述: IC OPAMP RRO ZERO DRIFT 8SOIC
标准包装: 1,000
放大器类型: 零漂移
电路数: 1
输出类型: 满摆幅
转换速率: 1.5 V/µs
增益带宽积: 1.5MHz
-3db带宽: 2.5MHz
电流 - 输入偏压: 45pA
电压 - 输入偏移: 0.5µV
电流 - 电源: 850µA
电流 - 输出 / 通道: 38mA
电压 - 电源,单路/双路(±): 4.5 V ~ 30 V,±2.25 V ~ 15 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SO
包装: 带卷 (TR)
ADA4638-1
Data Sheet
Rev. 0 | Page 16 of 24
APPLICATIONS INFORMATION
The ADA4638-1, with its wide supply voltage range of 4.5 V to
30 V, is a precision, rail-to-rail output, zero-drift operational
amplifier that features a patented combination of auto-zeroing
and chopping technique. This unique topology allows the
ADA4638-1 to maintain its low offset voltage over a wide tempera-
ture range and over its operating lifetime. This amplifier offers
ultralow input offset voltage of 4.5 μV maximum and an input
offset voltage drift of 80 nV/°C maximum. Offset voltage errors
due to common-mode voltage swings and power supply varia-
tions are also corrected by the auto-zeroing and chopping tech-
nique, resulting in a superb typical CMRR figure of 142 dB and
a PSRR figure of 143 dB at a ±15 V supply voltage. With ultrahigh
dc accuracy and no 1/f noise component, the ADA4638-1 is
ideal for high gain amplification of low level signals in dc or low
frequency applications without the risk of excessive output
voltage errors.
DIFFERENTIATION
Traditionally, zero-drift amplifiers are designed using either the
auto-zeroing or chopping technique. Each technique has its
benefits and drawbacks. Auto-zeroing usually results in low
noise energy at the auto-zeroing frequency, at the expense of
higher low frequency noise due to aliasing of wideband noise
into the auto-zeroed frequency band. Chopping results in lower
low frequency noise at the expense of larger noise energy at the
chopping frequency. The ADA4638-1 uses both auto-zeroing
and chopping in a patented ping-pong arrangement to obtain
lower low frequency noise together with lower energy at the
chopping and auto-zeroing frequencies, maximizing the signal-
to-noise ratio for the majority of applications. The relatively
high chopping frequency of 16 kHz and auto-zeroing frequency
of 8 kHz simplifies filter requirements for a wide, useful
bandwidth.
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