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| 型号： | LTC6912CDE-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC PGA DIGITAL R-R DUAL 12-DFN |
| 标准包装： | 2,500 |
| 放大器类型： | 可编程增益 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 26 V/µs |
| 增益带宽积： | 33MHz |
| 电压 - 输入偏移： | 125µV |
| 电流 - 电源： | 2.25mA |
| 电流 - 输出 / 通道： | 35mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 10.5 V，±2.7 V ~ 5.25 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN-EP（4x3） |
| 包装： | 带卷 (TR) |
LTC6912
22
6912fa
SNR from an amplifier is the ratio of input level to input-
referred noise, and can be 108dB with the LTC6912 family
at unity gain.
Construction and Instrumentation Cautions
Electrically clean construction is important in applications
seeking the full dynamic range of the LTC6912 family of
dual amplifiers. It is absolutely critical to have AGND either
AC bypassed or wired directly using the shortest possible
wiring, to a low impedance ground return for best channel-
to-channel isolation. Short, direct wiring minimizes para-
sitic capacitance and inductance. High quality supply
bypass capacitors of 0.1
F near the chip provide good
APPLICATIO S I FOR ATIO
WU
UU
decoupling from a clean, low inductance power source.
But several centimeters of wire (i.e., a few
H of induc-
tance) from the power supplies, unless decoupled by
substantial capacitance (>10
F) near the chip, can create
a parasitic high-Q LC resonant circuit in the hundreds of
kHz range in the chip’s supplies or ground reference. This
may impair circuit performance at those frequencies. A
compact, carefully laid out printed circuit board with a
good ground plane makes a significant difference in mini-
mizing distortion. Finally, equipment to measure perfor-
mance can itself introduce distortion or noise floors.
Checking for these limits with wired shorts from INA to
OUTA and INB to OUTB in place of the chip is a prudent
routine procedure.
TYPICAL APPLICATIO
U
Low Noise AC Amplifier with Programmable Gain and
Bandwidth
Analog data acquisition can exploit band limiting as well as
gain to suppress unwanted signals or noise. Tailoring an
analog front end to both the level and bandwidth of each
source maximizes the resulting SNR. Figure 7 shows a
block diagram for a low noise amplifier with gain and
bandwidth independently programmable over a 100:1
range. Channels A and B of the LTC6912-1 are used to
independently control the gain and bandwidth respec-
tively over a 100:1 range. The LT1884 dual op amp forms
an integrating lowpass loop with capacitor C2 to set the
programmable upper corner frequency. The LT1884 also
supports rail-to-rail output swings over the total supply
voltage range of 2.7V to 10.5V. AC coupling through
capacitor C1 establishes a fixed low frequency corner of
1Hz, which can be adjusted by changing C1. Alternatively,
shorting C1 makes the amplifier DC coupled. If DC gain is
not needed, the AC coupling cap C1 serves to suppress
several error sources: any shift in DC levels, low frequency
noise, and DC offset voltages (not including the LT1884’s
low internal offset).
Figure 7. Block Diagram of an AC Amplifier with Programmable Gain and Bandwidth
–
+
–
+
VIN
VOUT
GAINA
GAINB
C1
10
F
C2
1
F
R1
15.8k
R2
15.8k
1M
R
1/2 LT1884
LTC6912-1
CHANNEL A
LTC6912-1
CHANNEL B
GAIN
CONTROL
PGA
BANDWIDTH
CONTROL
PGA
VOUT = GAINA
VIN
R2
R1
6912 F07
INA
OUTA
INB
OUTB
1
2
πR1C1
1
R2
GAINB
2
π (
)C2
–3dB BANDWIDTH RANGE IS FROM
TO
≤
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6912CDE-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Programmable Gain Amplifiers with Serial Digital Interface |
| LTC6912CDE-2#PBF | 功能描述:IC PGA DIGITAL R-R DUAL 12-DFN RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:3 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:70µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:Digi-Reel® 其它名称:MAX4475AUT#TG16DKR |
| LTC6912CDE-2#TRPBF | 功能描述:IC PGA DIGITAL R-R DUAL 12-DFN RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:3 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:70µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:Digi-Reel® 其它名称:MAX4475AUT#TG16DKR |
| LTC6912CGN-1 | 制造商:Linear Technology 功能描述:SP Amp Variable Gain Amp Dual R-R I/O ±5.25V/10.5V 16-Pin SSOP N |
| LTC6912CGN-1#PBF | 功能描述:IC PGA DIGITAL R-R DUAL 16SSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
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