參數(shù)資料
型號(hào)： VCA2615PFBR
廠商： TEXAS INSTRUMENTS INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PQFP48
封裝： GREEN, PLASTIC, TQFP-48
文件頁(yè)數(shù)： 9/33頁(yè)
文件大?。?/td> 1122K
代理商： VCA2615PFBR
VCA2615
SBOS316D JULY 2005 REVISED OCTOBER 2008
www.ti.com
17
The ability to change the gain electronically offers
additional flexibility for optimizing the gain in order to
achieve either maximum signal-handling capability or
maximum sensitivity. Table 3 lists the input and output
signal-handling capability of the LNP.
Table 4 shows the voltage noise of the LNP for different
gain settings.
Table 3. Signal Handling Capability of LNP
GAIN
(dB)
G1, G2
MAX INPUT
(VPP Single-Ended)
MAX OUTPUT
(VPP Differential)
22
11
0.23
3.5
18
10
0.39
3.5
12
01
0.78
3.5
3
00
2.3
3.0
Table 4. LNP Gain vs Voltage Noise
LNP GAIN (dB)
VOLTAGE NOISE
(nV/
√Hz) at 5MHz
22
0.8
18
1.1
12
1.9
3
4.9
The current noise for the LNP is 1pA/
√Hz for all gain
settings. The input capacitance of the LNP is 45pF.
The LNP output drives a buffer and a multiplexer (MUX)
along with a feedback network that can be used to program
the input impedance. Figure 56 shows a block diagram of
how these circuits are connected together. The output of
the LNP feeds a buffer to avoid the loading effect of the
feedback resistors and to achieve a more robust capability
for driving external circuits.
Buffer
LNP
VGA
OUT
LNP OUT
VGA IN
MUX
IN
Feedback
Resistors
Figure 56. Block Diagram of LNP/VGA Interface
See Figure 57, which shows the response time of the LNP
gain changing from minimum to maximum.
Time (200ns/div)
LNP Gain
11
00
(10V/div)
LNP
Output
(500mV/div)
Figure 57. LNP Gain Change Response
The LNP also feeds a MUX, which accepts the LNP signal
or can receive an external signal. When applying an
external signal to the MUX (VCAIN), the signal should be
biased to a common-mode voltage in the range of 1.85V
to 3.15V. This biasing could be accomplished by using the
2.5V level of the VCM pin (19) of the VCA2615.
To MUX
(VGA
IN)
V
CM
IN
Figure 58. Recommended Circuit for Coupling an
External Signal into the MUX
INPUT IMPEDANCE
Figure 59 shows a simplified schematic of the resistor
feedback network along with Table 5 that relates the FB1,
FB2, FB3 and FB4 code to the selected value. When the
selection bits leave the feedback network in the open
position, the input resistance of the LNP will become
100k
.
LNP
IN
OUT
1500
(FB1)
(FB2)
(FB3)
(FB4)
1000
500
250
Buffer
Figure 59. Feedback Resistor Network
相關(guān)PDF資料
PDF描述
VCA2615RGZR SPECIALTY ANALOG CIRCUIT, PQCC48
VCA3-103-60M00 CRYSTAL OSCILLATOR, CLOCK, 60 MHz, HCMOS/TTL OUTPUT
VCA3-A3F-FREQ CRYSTAL OSCILLATOR, CLOCK, 0.32768 MHz - 160 MHz, CMOS OUTPUT
VCA3-A5D-FREQ CRYSTAL OSCILLATOR, CLOCK, 0.32768 MHz - 160 MHz, CMOS OUTPUT
VCA3-C3H-FREQ CRYSTAL OSCILLATOR, CLOCK, 0.32768 MHz - 160 MHz, CMOS OUTPUT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
VCA2615PFBT 功能描述:特殊用途放大器 2Ch Variable Gain Amplifier 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
VCA2615RGZR 功能描述:特殊用途放大器 2-Channel Variable Gain Amplifier 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
VCA2615RGZRG4 功能描述:特殊用途放大器 2-Channel Variable Gain Amplifier 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
VCA2615RGZT 功能描述:特殊用途放大器 2-Channel Variable Gain Amplifier 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
VCA2615RGZTG4 功能描述:特殊用途放大器 2-Channel Variable Gain Amplifier 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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*