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參數(shù)資料
| 型號： | THS6042CD |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 350 mA, 【12 V ADSL CPE LINE DRIVERS |
| 中文描述： | 350毫安，【12伏ADSL終端線路驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 26/33頁 |
| 文件大?。?/td> | 509K |
| 代理商： | THS6042CD |
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THS6042, THS6043
350 mA,
±
12 V ADSL CPE LINE DRIVERS
SLOS264G
–
MARCH 2000
–
REVISED DECEMBER 2001
26
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
recommended feedback and gain resistor values
As with all current feedback amplifiers, the bandwidth of the THS6042/3 is an inversely proportional function
of the value of the feedback resistor. This can be seen from
Figures 1 to 6. The recommended resistors for the
optimum frequency response are shown in Table 1. These should be used as a starting point and once optimum
values are found, 1% tolerance resistors should be used to maintain frequency response characteristics.
Because there is a finite amount of output resistance of the operational amplifier, load resistance can play a
major part in frequency response. This is especially true with these drivers, which tend to drive low-impedance
loads. This can be seen in Figures 1
–
6. As the load resistance increases, the output resistance of the amplifier
becomes less dominant at high frequencies. To compensate for this, the feedback resistor may need to be
changed. For most applications, a feedback resistor value of 750
is recommended, which is a good
compromise between bandwidth and phase margin that yields a very stable amplifier.
Table 1. Recommended Feedback (R
f
) Values for Optimum Frequency Response
GAIN
RL = 25
RL = 100
VCC =
±
6 V
680
470
270
200
VCC =
±
12 V
560
430
240
200
VCC =
±
6 V
620
430
270
200
VCC =
±
12 V
510
390
240
200
1
2,
–
1
4
8
Consistent with current feedback amplifiers, increasing the gain is best accomplished by changing the gain
resistor, not the feedback resistor. This is because the bandwidth of the amplifier is dominated by the feedback
resistor value and internal dominant-pole capacitor. The ability to control the amplifier gain independently of the
bandwidth constitutes a major advantage of current feedback amplifiers over conventional voltage feedback
amplifiers. Therefore, once a frequency response is found suitable to a particular application, adjust the value
of the gain resistor to increase or decrease the overall amplifier gain.
Finally, it is important to realize the effects of the feedback resistance on distortion. Increasing the resistance
decreases the loop gain and may increase the distortion. Decreasing the feedback resistance too low may
increase the bandwidth, but an increase in the load on the output may cause distortion to increase instead of
decreasing. It is also important to know that decreasing load impedance increases total harmonic distortion
(THD). Typically, the third order harmonic distortion increases more than the second order harmonic distortion.
This is illustrated in Figure 10 to 12 and Figures 16 to 18.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THS6042EVM | 350 mA, 【12 V ADSL CPE LINE DRIVERS |
| THS6043CD | 350 mA, 【12 V ADSL CPE LINE DRIVERS |
| THS6043EVM | 350 mA, 【12 V ADSL CPE LINE DRIVERS |
| THS6062D | LOW-NOISE ADSL DUAL DIFFERENTIAL RECEIVER |
| THS6062DGN | LOW-NOISE ADSL DUAL DIFFERENTIAL RECEIVER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS6042CDDA | 功能描述:高速運(yùn)算放大器 350-mA +/-12V ADSL CPE Line Driver 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 |
| THS6042CDDAG3 | 功能描述:高速運(yùn)算放大器 350-mA +/-12V ADSL CPE Line Driver 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 |
| THS6042CDDAR | 功能描述:高速運(yùn)算放大器 350-mA +/-12V ADSL CPE Line Driver 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 |
| THS6042CDDARG3 | 功能描述:高速運(yùn)算放大器 350-mA +/-12V ADSL CPE Line Driver 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 |
| THS6042CDG4 | 功能描述:高速運(yùn)算放大器 350-mA +/-12V ADSL CPE Line Driver 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 |
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