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參數(shù)資料
| 型號(hào)： | OPA658NB |
| 英文描述： | Wideband, Low Power Current Feedback OPERATIONAL AMPLIFIER |
| 中文描述： | 寬帶，低功耗電流反饋運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 215K |
| 代理商： | OPA658NB |
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OPA658
close-in spurious tones will appear at f
O
±
3
f. The two
tone, third-order spurious plot shown in Figure 7 indicates
how far below these two equal power, closely spaced, tones
the intermodulation spurious will be. The single tone power
is at a matched 50
load. The unique design of the OPA658
provides much greater spurious free range than what a two-
tone third-order intermodulation intercept specification would
predict. This can be seen in Figure 7 as the spurious free
range actually increases at the higher output power levels.
COMPENSATION
The OPA658 is internally compensated and is stable in unity
gain with a phase margin of approximately 62
°
, and approxi-
mately 64
°
in a gain of +2V/V when used with the recom-
mended feedback resistor value. Frequency response for
other gains are shown in the Typical Performance Curves.
The high-frequency response of the OPA658 in a good
layout is very flat with frequency.
DISTORTION
The OPA658’s Harmonic Distortion characteristics into a
100
load are shown versus frequency and power output in
the Typical Performance Curves. Distortion can be further
improved by increasing the load resistance as illustrated in
Figure 6. Remember to include the contribution of the
feedback resistance when calculating the effective load re-
sistance seen by the amplifier.
Narrowband communication channel requirements will ben-
efit from the OPA658’s wide bandwidth and low
intermodulation distortion on low quiescent power. If output
signal power at two closely spaced frequencies is required,
third-order nonlinearities in any amplifier will cause spuri-
ous power at frequencies very near the two funda-
mental frequencies. If the two test frequencies, f
1
and f
2
,
are specified in terms of average and delta frequency,
f
O
= (f
1
+ f
2
)/2 and
f =
f
– f
1
, the two, third-order,
DIFFERENTIAL GAIN AND PHASE
Differential Gain (dG) and Differential Phase (dP) are among
the more important specifications for video applications. dG
is defined as the percent change in closed-loop gain over a
specified change in output voltage level. dP is defined as the
change in degrees of the closed-loop phase over the same
output voltage change. Both dG and dP are specified at the
NTSC sub-carrier frequency of 3.58MHz and the PAL sub-
carrier of 4.43MHz. All NTSC measurements were per-
formed using a Tektronix model VM700A Video Measure-
ment Set.
dG/dP of the OPA658 were measured with the amplifier in a
gain of +2V/V with 75
input impedance and the output
back-terminated in 75
. The input signal selected from the
generator was a 0V to 1.4V modulated ramp with sync pulse.
With these conditions the test circuit shown in Figure 8
delivered a 100IRE modulated ramp to the 75
input of the
videoanalyzer. The signal averaging feature of the analyzer
FIGURE 5. Driving Capacitive Loads.
FIGURE 6. 5MHz Harmonic Distortion vs Load Resistance.
–55
–60
–65
–70
–75
–80
–85
5MHz HARMONIC DISTORTION vs
LOAD RESISTANCE (G = +2)
Load Resistance (
)
H
10
100
1k
G = +2, V
O
= 2Vp-p, f
O
= 5MHz
3f
O
2f
O
FIGURE 7. Third-Order Spurious Level vs Frequency.
–65
–70
–75
–80
–85
–90
–18 –16 –14 –12 –10
–8
–6
–4
–2
0
2
4
T
TWO TONE, THIRD-ORDER SPURIOUS LEVELS
Single Tone Power (dBm)
20MHz
10MHz
5MHz
OPA658
75
75
402
402
75
75
TEK TSG 130A
TEK VM700A
FIGURE 8. Configuration for Testing Differential Gain/Phase.
OPA658
50
R
ISO
R
L
C
L
10
to 35
402
402
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA658UB | Wideband, Low Power Current Feedback OPERATIONAL AMPLIFIER |
| OPA658 | Wideband, Low Power Current Feedback OPERATIONAL AMPLIFIER |
| OPA658N | Wideband, Low Power Current Feedback OPERATIONAL AMPLIFIER |
| OPA658P | Wideband, Low Power Current Feedback OPERATIONAL AMPLIFIER |
| OPA658U | Wideband, Low Power Current Feedback OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA658P | 功能描述:高速運(yùn)算放大器 Wideband 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 |
| OPA658U | 功能描述:高速運(yùn)算放大器 Wideband Low Power 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 |
| OPA658U-1 | 制造商:Texas Instruments 功能描述: |
| OPA658UB | 功能描述:高速運(yùn)算放大器 Wideband Low Power 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 |
| OPA659 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Wideband, Unity-Gain Stable, JFET-Input OPERATIONAL AMPLIFIER |
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