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參數(shù)資料
| 型號： | THS7002EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 70-MHz PROGRAMMABLE-GAIN AMPLIFIERS |
| 中文描述： | 70 - MHz的可編程增益放大器 |
| 文件頁數(shù)： | 27/32頁 |
| 文件大?。?/td> | 597K |
| 代理商： | THS7002EVM |
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THS7001, THS7002
70-MHz PROGRAMMABLE-GAIN AMPLIFIERS
SLOS214B – OCTOBER 1998 – REVISED AUGUST 1999
27
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
ADSL (continued)
Typically, the outputs of the preamplifiers are carried into a CODEC, which incorporates an analog-to-digital
converter (ADC). The problem with this setup is that it only uses fixed gain elements. But, when the client is close
to the central office, the gain must be set to receive a high-level signal; or for the opposite, set to receive a
low-level signal. To solve this problem, a programmable-gain amplifier (PGA) should be used. The THS7001
and THS7002 PGAs allow the gain of the receiver signals to be varied from –22 dB to 20 dB. By allowing the
gains to be controlled with a TTL-compatible signal, it is very easy to integrate the THS7001 and THS7002 into
any system.
By having the preamplifier output separate from the PGA input, inserting more amplifiers into the system can
be accomplished easily. The functionality of the amplifier is typically as an active fixed gain filter. This is shown
in Figure 66.
PGA
To
CODEC
_
+
_
+
V0+
R1
R2
C1
C2
RG
RF
G0 G1 G2
TO DSP
3.3 k
3.3 k
3.3 k
THS6062
VL
+5 V
VH
RECEIVER
BLOCK
OPTIONAL CIRCUIT
Preamp
Figure 66. Typical PGA Setup (One Channel)
circuit layout considerations
In order to achieve the levels of high-frequency performance of the THS7001 and THS7002, it is essential that
proper printed-circuit board high-frequency design techniques be followed. A general set of guidelines is given
below. In addition, a THS7001 and THS7002 evaluation board is available to use as a guide for layout or for
evaluating the device performance.
Ground planes—It is highly recommended that a ground plane be used on the board to provide all
components with a low inductive ground connection. However, in the areas of the amplifier inputs and
output, the ground plane can be removed to minimize the stray capacitance.
Proper power supply decoupling—Use a 6.8-
μ
F tantalum capacitor in parallel with a 0.1-
μ
F ceramic
capacitor on each supply terminal. It may be possible to share the tantalum among several amplifiers
depending on the application, but a 0.1-
μ
F ceramic capacitor should always be used on the supply terminal
of every amplifier. In addition, the 0.1-
μ
F capacitor should be placed as close as possible to the supply
terminal. As this distance increases, the inductance in the connecting trace makes the capacitor less
effective. The designer should strive for distances of less than 0.1 inches between the device power
terminals and the ceramic capacitors.
Sockets—Sockets are not recommended for high-speed operational amplifiers. The additional lead
inductance in the socket pins will often lead to stability problems. Surface-mount packages soldered directly
to the printed-circuit board is the best implementation.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| THS7002IPWP | 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| 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 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS7002IPWPR | 功能描述:運算放大器 - 運放 70-MHz Programmable- Gain Dual RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| THS7002PWP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:70-MHz PROGRAMMABLE-GAIN AMPLIFIERS |
| THS7102 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ADSL (POTS) CENTRAL OFFICE LINE INTERFACE DRIVER/RECEIVER |
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