參數(shù)資料
型號(hào)： VCA8613YR
廠商： Texas Instruments, Inc.
元件分類(lèi)： 可變?cè)鲆娣糯笃?/td>
英文描述： 8-Channel VARIABLE GAIN AMPLIFIER
中文描述： 8通道可變?cè)鲆娣糯笃?/td>
文件頁(yè)數(shù)： 17/21頁(yè)
文件大?。?/td> 378K
代理商： VCA8613YR
VCA8613
SBOS200C
17
www.ti.com
OUTPUT FILTER
The VCA8613 integrates a 2-pole low-pass Butterworth filter
in the output stage, as shown in Figure 7. The cutoff fre-
quency is implemented with passive semiconductor ele-
ments and as such, the cutoff frequency will not be precise.
Table IV shows the cutoff frequency for the different PGA
settings.
The variation shown in Table IV reflects deviations as mea-
sured from chip to chip and over the specified temperature
range.
TABLE IV. Cutoff Frequency for PGA Settings.
PGA
BANDWIDTH
00
01
13MHz to 14MHz
11MHz to 12MHz
SERIAL INTERFACE
The serial interface of the VCA8613 allows the user flexibility
in the use of the part. The following are set from the serial
control registers:
Mode
TGC Mode
CW Mode
Attenuation Range
PGA Gain
Power-Down (this is the default state in which the
VCA8613 powers up)
CW Output Selection For Each Input Channel
The serial interface uses an SPI style of interface format. The
Input Register Bit Maps (see page 5) show the functionality
of each control register.
LAYOUT CONSIDERATIONS
The VCA8613 is a multi-channel amplifier capable of high
gains that has integrated digital controls. Layout of the
VCA8613 is fairly straightforward. By connecting all of the
grounds (including the digital grounds) to the analog ground,
noise performance will help to be maintained. The analog
ground should be a solid plane.
Power-supply decoupling and decoupling of the control volt-
age (VCA
CNTRL
) pin are essential in order to ensure that the
noise performance be maintained. For further help in deter-
mining basic values, please refer to Figure 8.
1k
1k
2M
2M
80pF
80pF
OUT+
OUT
–
V
CM
V
CM
Attenuator
FIGURE 7. Simplified PGA and Output Filter Circuit.
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參數(shù)描述
VCA8613YT 功能描述:特殊用途放大器 8-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
VCA8616PAGT 制造商:Texas Instruments 功能描述:
VCA8617 制造商:BB 制造商全稱:BB 功能描述:8-Channel VARIABLE GAIN AMPLIFIER
VCA8617PAGR 功能描述:特殊用途放大器 8-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
VCA8617PAGRG4 功能描述:特殊用途放大器 8-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
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