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參數(shù)資料
| 型號： | OPA4650 |
| 英文描述： | Wideband, Low Power, Quad Voltage Feedback OPERATIONAL AMPLIFIER |
| 中文描述： | 寬帶，低功耗，四路電壓反饋運算放大器 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 235K |
| 代理商： | OPA4650 |
11
OPA4650
DIFFERENTIAL GAIN AND PHASE
Differential Gain (DG) and Differential Phase (DP) are
among the more important specifications for video applica-
tions. The percentage change in closed-loop gain over a
specified change in output voltage level is defined as DG.
DP is defined as the change in degrees of the closed-loop
phase over the same output voltage change. For the OPA4650,
DG and DP are both specified at the NTSC color sub-carrier
frequency of 3.58MHz and measured using industry stan-
dard video test equipment.
DISTORTION
The OPA4650’s harmonic distortion characteristics for a
100
load are shown in the Typical Performance Curves.
Distortion can be improved by increasing the load resistance
as illustrated in Figure 5. Remember to include the contribu-
tion of the feedback network when calculating the effective
load resistance seen by the amplifier.
FIGURE 6. Channel-to-Channel Isolation and All Hostile
Crosstalk.
0.1
1
10
100
300
Frequency (Hz)
–30
–40
–50
–60
–70
–80
C
G = +1
All Hostile
Channel-to-Channel
FIGURE 5. Harmonic Distortion vs Load Resistance.
–50
–60
–70
–80
–90
10
100
1k
H
Load Resistance (
)
3f
O
(f
O
= 5MHz, 2Vp-p)
2f
O
CROSSTALK
Crosstalk is the undesired coupling of one channel’s signal
into the output of the other channels. Crosstalk is a consid-
eration in all multichannel integrated circuits. The effect of
crosstalk is measured by driving one (“channel-to-channel”)
or more (“all-hostile”) channels and observing the output of
the undriven channel. The magnitude of this effect is ex-
pressed in the crosstalk specification as decibels of gain.
“Input referred” points to the fact that there is a direct
correlation between gain and crosstalk, therefore output
crosstalk increases proportionally at higher gains.
In quad devices, the effect of all-hostile crosstalk is observed
by driving all three channels concurrently and measuring the
output of the undriven fourth channel. The plots in Figure 6
illustrate both channel-to-channel and all-hostile crosstalk
for the OPA4650.
FIGURE 7. Noise Figure vs Source Resistance.
Source Resistance (
)
30
25
20
15
10
5
0
10
100
1k
100k
10k
N
NF = 10 LOG 1 +
e
n2
+ (I
n
R
S
)
2
4KTR
S
SPICE MODELS AND EVALUATION BOARD
Computer simulation using SPICE is often useful when
analyzing the performance of analog circuits and systems.
This is particularly true for Video and RF amplifier circuits
where parasitic capacitance and inductance can have a
major effect on circuit performance. SPICE models and
evaluation PC boards are available for the OPA4650. Con-
tact the Burr-Brown Applications Department to receive a
SPICE diskette.
NOISE FIGURE
The voltage and current noise spectral density are shown in
the Typical Performance Curves. For RF and IF applica-
tions, however, Noise Figure (NF) is often the preferred
specification. This specification shows a degradation in
SNR through a device relative to the thermal noise of the
source impedance alone.
The NF for the OPA4650, using 1MHz spot noise numbers
and an unterminated non-inverting input, is shown in
Figure 7.
DEMONSTRATION BOARD
PACKAGE
PRODUCT
DEM-OPA465xP
DEM-OPA465xU
8-Pin DIP
SO-8
OPA4650P
oPA4650U
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA4650P | Wideband, Low Power, Quad Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA4650U | Wideband, Low Power, Quad Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA4684ID | Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER |
| OPA4684 | Wideband, Low-Power, Current Feedback Operational Amplifier |
| OPA4684IPWR | Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA4650P | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OPA4650U | 制造商:BB 制造商全稱:BB 功能描述:Wideband, Low Power, Quad Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA4658 | 制造商:BB 制造商全稱:BB 功能描述:Quad Wideband, Low Power Current Feedback OPERATIONAL AMPLIFIER |
| OPA4658P | 功能描述:高速運算放大器 Quad Wideband 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(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 |
| OPA4658U | 功能描述:高速運算放大器 Quad Wideband 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(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 |
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