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| 型號(hào)： | THS4082IDR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, SOIC-8 |
| 文件頁(yè)數(shù)： | 11/32頁(yè) |
| 文件大小： | 841K |
| 代理商： | THS4082IDR |
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THS4081, THS4082
175MHz LOW POWER HIGHSPEED AMPLIFIERS
SLOS274D DECEMBER 1999 REVISED JUNE 2001
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
general PowerPAD
design considerations (continued)
The next consideration is the package constraints. The two sources of heat within an amplifier are quiescent
power and output power. The designer should never forget about the quiescent heat generated within the
device, especially multiamplifier devices. Because these devices have linear output stages (Class A-B), most
of the heat dissipation is at low output voltages with high output currents. Figure 47 to Figure 50 show this effect,
along with the quiescent heat, with an ambient air temperature of 50
°C. Obviously, as the ambient temperature
increases, the limit lines shown will drop accordingly. The area under each respective limit line is considered
the safe operating area. Any condition above this line will exceed the amplifier’s limits and failure may result.
When using VCC = ±5 V, there is generally not a heat problem, even with SOIC packages. But, when using
VCC = ±15 V, the SOIC package is severely limited in the amount of heat it can dissipate. The other key factor
when looking at these graphs is how the devices are mounted on the PCB. The PowerPAD
devices are
extremely useful for heat dissipation. But, the device should always be soldered to a copper plane to fully use
the heat dissipation properties of the PowerPAD
. The SOIC package, on the other hand, is highly dependent
on how it is mounted on the PCB. As more trace and copper area is placed around the device,
θJA decreases
and the heat dissipation capability increases. The currents and voltages shown in these graphs are for the total
package. For the dual amplifier package (THS4082), the sum of the RMS output currents and voltages should
be used to choose the proper package. The graphs shown assume that both amplifier’s outputs are identical.
Figure 47
Package With
θJA < = 127°C/W
SO-8 Package
θJA = 167°C/W
Low-K Test PCB
VCC = ± 5 V
TJ = 150°C
TA = 50°C
100
80
40
0
01
2
3
Maximum
RMS
Output
Current
mA
140
180
200
45
160
120
60
20
| VO | RMS Output Voltage V
I O||
Maximum Output
Current Limit Line
THS4081
MAXIMUM RMS OUTPUT CURRENT
vs
RMS OUTPUT VOLTAGE DUE TO THERMAL LIMITS
Safe Operating
Area
Figure 48
100
10
03
6
9
1000
12
15
Maximum Output
Current Limit Line
SO-8 Package
θJA = 167°C/W
Low-K Test PCB
SO-8 Package
θJA = 98°C/W
High-K Test PCB
TJ = 150°C
TA = 50°C
| VO | RMS Output Voltage V
Maximum
RMS
Output
Current
mA
I O||
VCC = ± 15 V
DGN Package
θJA = 58.4°C/W
THS4081
MAXIMUM RMS OUTPUT CURRENT
vs
RMS OUTPUT VOLTAGE DUE TO THERMAL LIMITS
Safe Operating
Area
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| THS4082IDRG4 | 功能描述:高速運(yùn)算放大器 175-MHz Low-Power Vltg-Feedback Dual 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 |
| THS412 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:200MHz, CMOS OPERATIONAL AMPLIFIER WITH SHUTDOWN |
| THS4120 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-SPEED FULLY DIFFERENTIAL I/O AMPLIFIERS |
| THS4120CD | 功能描述:特殊用途放大器 Fully Differential CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4120CDG4 | 功能描述:特殊用途放大器 3.3V 100 MHz 43 V/us Fully Diff CMOS Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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