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參數(shù)資料
| 型號(hào)： | OPA2677U |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Current-Feedback Operational Amplifier |
| 中文描述： | 電流反饋運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大小： | 210K |
| 代理商： | OPA2677U |
OPA2604
8
APPLICATIONS INFORMATION
The OPA2604 is unity-gain stable, making it easy to use in a
wide range of circuitry. Applications with noisy or high
impedance power supply lines may require decoupling ca-
pacitors close to the device pins. In most cases 1
μ
F tantalum
capacitors are adequate.
DISTORTION MEASUREMENTS
The distortion produced by the OPA2604 is below the mea-
surement limit of virtually all commercially available equip-
ment. A special test circuit, however, can be used to extend the
measurement capabilities.
Op amp distortion can be considered an internal error source
which can be referred to the input. Figure 1 shows a circuit
which causes the op amp distortion to be 101 times greater
than normally produced by the op amp. The addition of R
3
to
the otherwise standard non-inverting amplifier configuration
alters the feedback factor or noise gain of the circuit. The
closed-loop gain is unchanged, but the feedback available for
error correction is reduced by a factor of 101. This extends the
measurement limit, including the effects of the signal-source
purity, by a factor of 101. Note that the input signal and load
applied to the op amp are the same as with conventional
feedback without R
3
.
Validity of this technique can be verified by duplicating
measurements at high gain and/or high frequency where the
distortion is within the measurement capability of the test
equipment. Measurements for this data sheet were made with
the Audio Precision System One which greatly simplifies
such repetitive measurements. The measurement technique
can, however, be performed with manual distortion measure-
ment instruments.
CAPACITIVE LOADS
The dynamic characteristics of the OPA2604 have been
optimized for commonly encountered gains, loads and oper-
ating conditions. The combination of low closed-loop gain
and capacitive load will decrease the phase margin and may
lead to gain peaking or oscillations. Load capacitance reacts
with the op amp’s open-loop output resistance to form an
additional pole in the feedback loop. Figure 2 shows various
circuits which preserve phase margin with capacitive load.
Request Application Bulletin AB-028 for details of analysis
techniques and applications circuits.
For the unity-gain buffer, Figure 2a, stability is preserved by
adding a phase-lead network, R
C
and C
C
. Voltage drop across
R
C
will reduce output voltage swing with heavy loads. An
alternate circuit, Figure 2b, does not limit the output with low
load impedance. It provides a small amount of positive feed-
back to reduce the net feedback factor. Input impedance of this
circuit falls at high frequency as op amp gain rolloff reduces
the bootstrap action on the compensation network.
Figures 2c and 2d show compensation techniques for
noninverting amplifiers. Like the follower circuits, the circuit
in Figure 2d eliminates voltage drop due to load current, but
at the penalty of somewhat reduced input impedance at high
frequency.
Figures 2e and 2f show input lead compensation networks for
inverting and difference amplifier configurations.
NOISE PERFORMANCE
Op amp noise is described by two parameters—noise voltage
and noise current. The voltage noise determines the noise
performance with low source impedance. Low noise bipolar-
input op amps such as the OPA27 and OPA37 provide very
low voltage noise. But if source impedance is greater than a
few thousand ohms, the current noise of bipolar-input op amps
react with the source impedance and will dominate. At a few
thousand ohms source impedance and above, the OPA2604
will generally provide lower noise.
FIGURE 1. Distortion Test Circuit.
R
2
1 2
OPA2604
R
1
R
3
V
= 10Vp-p
(3.5Vrms)
Generator
Output
Analyzer
Input
Audio Precision
System One
Analyzer*
R
L
1k
IBM PC
or
Compatible
SIG.
GAIN
1
DIST.
GAIN
101
R
1
∞
R
2
5k
5k
5k
R
3
50
500
∞
500
50
10
100
101
101
* Measurement BW = 80kHz
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA2677U | 制造商:Texas Instruments 功能描述:OP AMP DUAL WIDEBAND 2677 SOIC8 制造商:Texas Instruments 功能描述:OP AMP, DUAL WIDEBAND, 2677, SOIC8 制造商:Texas Instruments 功能描述:OP AMP, DUAL WIDEBAND, 2677, SOIC8; Op Amp Type:Wideband; No. of Amplifiers:2; Slew Rate:1800V/s; Supply Voltage Range: 2.5V to 6V; Amplifier Case Style:SOIC; No. of Pins:8; Bandwidth:220MHz; Operating Temperature Min:-40C; ;RoHS Compliant: Yes |
| OPA2677U/2K5 | 功能描述:高速運(yùn)算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA2677U/2K5G4 | 功能描述:高速運(yùn)算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA2677UG4 | 功能描述:高速運(yùn)算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA2680N | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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