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參數(shù)資料
| 型號： | OPA699 |
| 元件分類： | 運動控制電子 |
| 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)： | 21/25頁 |
| 文件大?。?/td> | 461K |
| 代理商： | OPA699 |
OPA699
SBOS261B
21
www.ti.com
In general, capacitive loads should be minimized for optimum
high-frequency performance. The capacitance of coax cable
(29pF/ft for RG-58) will not load the amplifier when the
coaxial cable, or transmission line, is terminated in its char-
acteristic impedance.
FREQUENCY RESPONSE COMPENSATION
The OPA699 is internally compensated to be unity-gain
stable, 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 (that is, 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 frequen-
cies, which limits the bandwidth.
For unity-gain stable amplifier is needed, the OPA698 is
recommended.
In applications where a large feedback resistor is required,
such as a 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 Teenetwork to reduce the RC time
constants set by the parasitic capacitances.
PULSE SETTLING TIME
The OPA699 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 ADC, use the recom-
mended R
S
in the typical performance curve Recommended
R
S
vs Capacitive Load Extremely 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 extremely good as shown in the typical char-
acteristics.
DISTORTION
The OPA699 distortion performance is specified for a 500
load, such as an ADC. Driving loads with smaller resistance
will increase the distortion, as illustrated in Figure 15. Re-
member to include the feedback network in the load resis-
tance calculations.
NOISE PERFORMANCE
High slew rate, voltage-feedback op amps usually achieve
their slew rate at the expense of a higher input noise voltage.
The 4.1nV/
√
Hz
input voltage noise for the OPA699, how-
ever, is much lower than comparable amplifiers. The input-
referred voltage noise, and the two input-referred current
noise terms, combine to give low output noise under a wide
variety of operating conditions. Figure 16 shows the op amp
noise analysis model with all the noise terms included. In this
model, all noise terms are taken to be noise voltage or
current density terms in either nV/
√
Hz
or pA/
√
Hz
.
OPA699
C
L
R
L
R
T
R
S
R
G
R
F
V
O
R
L
is optional
H
Load Resistance (
)
100
1k
–
55
–
60
–
65
–
70
–
75
–
80
–
85
–
90
V
= 2V
PP
f = 5MHz
3rd-Harmonic
See Figure 1
2nd-Harmonic
4kT
R
G
R
G
R
F
R
S
OPA699
I
BI
E
O
I
BN
4kT = 1.6E
–
20J
at 290
°
K
E
RS
E
NI
4kTR
S
√
4kTR
F
√
FIGURE 14. Driving Capacitive Loads.
FIGURE 15. 5MHz Harmonic Distortion vs Load Resistance.
FIGURE 16. Op Amp Noise Analysis Model.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OPA699ID | 功能描述:高速運算放大器 Wideband High Gain Vltg Limiting RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA699ID | 制造商:Texas Instruments 功能描述:IC, LIMITING AMPLIFIER, 260MHZ, SOIC-8 |
| OPA699IDG4 | 功能描述:高速運算放大器 Wideband High Gain Vltg Limiting RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA699IDR | 功能描述:高速運算放大器 Wideband High Gain Vltg Limiting RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA699IDRG4 | 功能描述:高速運算放大器 Wideband High Gain Vltg Limiting RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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