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| 型号： | THS7002IPWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封装： | GREEN, PLASTIC, HTSSOP-28 |
| 文件页数： | 18/41页 |
| 文件大小： | 1203K |
| 代理商： | THS7002IPWP |
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THS7001, THS7002
70MHz PROGRAMMABLEGAIN AMPLIFIERS
SLOS214C OCTOBER 1998 REVISED MARCH 2007
25
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
general configurations (continued)
If even more attenuation is needed, a multiple-pole filter is required. The Sallen-Key filter can be used for this
task. For best results, the THS7001 and THS7002 preamplifier should have a bandwidth that is 8 to 10 times
the filter frequency bandwidth. Failure to do this can result in phase shift of the amplifier.
VI
C2
R2
R1
C1
RF
RG
R1 = R2 = R
C1 = C2 = C
Q = Peaking Factor
(Butterworth Q = 0.707)
(
=
1
Q
2
)
RG
RF
_
+
f
–3dB +
1
2
pRC
Figure 64. 2-Pole Low-Pass Sallen-Key Filter
ADSL
The ADSL receive band consists of up to 255 separate carrier frequencies each with its own modulation and
amplitude level. With such an implementation, it is imperative that signals received off the telephone line have
as high a signal-to-noise ratio (SNR) as possible. This is because of the numerous sources of interference on
the line. The best way to accomplish this high SNR is to have a low-noise preamplifier on the front-end. It is also
important to have the lowest distortion possible to help minimize against interference within the ADSL carriers.
The THS7001 and THS7002 was designed with these two priorities in mind.
By taking advantage of the superb characteristics of the complimentary bipolar process (BICOM), the THS7001
and THS7002 offers extremely low noise and distortion while maintaining a high bandwidth. There are some
aspects that help minimize distortion in any amplifier. The first is to extend the bandwidth of the amplifier as high
as possible without peaking. This allows the amplifier to eliminate any nonlinearities in the output signal. Another
thing that helps to minimize distortion is to increase the load impedance seen by the amplifier, thereby reducing
the currents in the output stage. This will help keep the output transistors in their linear amplification range and
will also reduce the heating effects.
One central-office side terminal circuit implementation, shown in Figure 65, uses a 1:2 transformer ratio. While
creating a power and output voltage advantage for the line drivers, the 1:2 transformer ratio reduces the SNR
for the received signals. The ADSL standard, ANSI T1.413, stipulates a noise power spectral density of –140
dBm/Hz, which is equivalent to 31.6 nV/
√Hz for a 100 system. Although many amplifiers can reach this level
of performance, actual ADSL system testing has indicated that the noise power spectral density may typically
be
≤ –150 dBm/Hz, or ≤ 10 nV/√Hz. With a transformer ratio of 1:2, this number reduces to less than 5 nV/√Hz.
The THS7002 preamplifiers, with an equivalent input noise of 1.7 nV/
√Hz, is an excellent choice for this
application. Coupled with a very low 0.9 pA/
√Hz equivalent input current noise and low value resistors, the
THS7001 and THS7002 will ensure that the received signal SNR will be as high as possible.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS7002IPWPG4 | 功能描述:特殊用途放大器 70-MHz Hi-Spd Dual Prgrmbl-Gain Amp RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS7002IPWPR | 功能描述:运算放大器 - 运放 70-MHz Programmable- Gain Dual RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| THS7002PWP | 制造商:TI 制造商全称:Texas Instruments 功能描述:70-MHz PROGRAMMABLE-GAIN AMPLIFIERS |
| THS7102 | 制造商:TI 制造商全称:Texas Instruments 功能描述:ADSL (POTS) CENTRAL OFFICE LINE INTERFACE DRIVER/RECEIVER |
| THS7103 | 制造商:TI 制造商全称:Texas Instruments 功能描述:ADSL (ISDN) CENTRAL OFFICE LINE INTERFACE DRIVER/RECEIVER |
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