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參數(shù)資料
| 型號(hào)： | OPA689P |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| 中文描述： | 寬帶，高增益電壓限幅放大器 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 175K |
| 代理商： | OPA689P |
16
OPA689
FREQUENCY RESPONSE COMPENSATION
The OPA689 is internally compensated to be stable at a gain
of +4, and has a nominal phase margin of 60
°
at a gain of +6.
Phase margin and peaking improve at higher gains. Recall
that an inverting gain of –5 is equivalent to a gain of +6 for
bandwidth purposes (i.e., noise gain = 6).
Standard external compensation techniques work with this
device. For example, in the inverting configuration, the
bandwidth may be limited without modifying the inverting
gain by placing a series RC network to ground on the
inverting node. This has the effect of increasing the noise
gain at high frequencies, which limits the bandwidth.
To maintain a large bandwidth at high gains, cascade several
op amps.
In applications where a large feedback resistor is required,
such as photodiode transimpedance amplifier, the parasitic
capacitance from the inverting input to ground causes peak-
ing or oscillations. To compensate for this effect, connect a
small capacitor in parallel with the feedback resistor. The
bandwidth will be limited by the pole that the feedback
resistor and this capacitor create. In other high gain applica-
tions, use a three resistor “Tee” network to reduce the RC
time constants set by the parasitic capacitances. Be careful
to not increase the noise generated by this feedback network
too much.
PULSE SETTLING TIME
The OPA689 is capable of an extremely fast settling time in
response to a pulse input. Frequency response flatness and
phase linearity are needed to obtain the best settling times.
For capacitive loads, such as an A/D converter, use the
recommended R
S
in the
R
S
vs Capacitive Load
plot. Ex-
tremely fine scale settling (0.01%) requires close attention to
ground return current in the supply decoupling capacitors.
The pulse settling characteristics when recovering from
overdrive are very good.
DISTORTION
The OPA689’s distortion performance is specified for a
500
load, such as an A/D converter. Driving loads with
smaller resistance will increase the distortion as illustrated in
Figure 11. Remember to include the feedback network in the
load resistance calculations.
FIGURE 11. 5MHz Harmonic Distortion vs Load Resistance.
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
HARMONIC DISTORTION vs LOAD RESISTANCE
Load Resistance (
)
2
50
100
1000
V
O
= 2Vp-p
f
1
= 5MHz
HD2
HD3
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA689 | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| OPA693ID | Ultra-Wideband, Fixed Gain Video BUFFER AMPLIFIER with Disable |
| OPA693IDR | Ultra-Wideband, Fixed Gain Video BUFFER AMPLIFIER with Disable |
| OPA693 | Ultra-Wideband, Fixed Gain Video BUFFER AMPLIFIER with Disable |
| OPA693IDBVR | Ultra-Wideband, Fixed Gain Video BUFFER AMPLIFIER with Disable |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA689U | 制造商:BB 制造商全稱:BB 功能描述:EVALUATION FIXTURE |
| OPA689U/2K5 | 制造商:Rochester Electronics LLC 功能描述:OP AMP WIDEBAND VOLT LIMITING - Bulk 制造商:Texas Instruments 功能描述: |
| OPA690 | 制造商:BB 制造商全稱:BB 功能描述:Low-Power, Single-Supply, Wideband Operational Amplifier |
| OPA690ID | 功能描述:高速運(yùn)算放大器 Wideband Voltage Feeback 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 |
| OPA690ID | 制造商:Texas Instruments 功能描述:IC SM OP-AMP WIDEBAND VFB |
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