参数资料
| 型号： | LTC6416IDDB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC DIFF 16BIT BUFFER 10-DFN |
| 标准包装： | 2,500 |
| 放大器类型： | 缓冲器 |
| 电路数： | 1 |
| 输出类型： | 差分 |
| 转换速率： | 3400 V/µs |
| -3db带宽： | 2GHz |
| 电流 - 输入偏压： | 5µA |
| 电压 - 输入偏移： | 500µV |
| 电流 - 电源： | 42mA |
| 电流 - 输出 / 通道： | 20mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 3.9 V，±1.35 V ~ 1.95 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN-EP（3x2） |
| 包装： | 带卷 (TR) |
LTC6416
13
6416f
APPLICATIONS INFORMATION
Circuit Operation
The LTC6416 is a low noise and low distortion fully dif-
ferential unity-gain ADC driver with operation from DC to
2GHz (–3dB bandwidth), a differential input impedance of
12kΩ, and a differential output impedance of 18Ω. The
LTC6416 is composed of a fully differential buffer with
output common mode voltage control circuitry and high
speed voltage-limiting clamps at the output. Small output
resistors of 9Ω improve the circuit stability over various
load conditions. They also simplify possible external lter-
ing options, which are often desirable when the load is an
ADC. Lowpass or bandpass lters are easily implemented
with just a few external components. The LTC6416 is very
exible in terms of I/O coupling. It can be AC- or DC-
coupled at the inputs, the outputs or both. When using
the LTC6416 with DC-coupled inputs, best performance is
obtained with an input common mode voltage between 1V
and 1.5V. For AC-coupled operation, the LTC6416 will take
the voltage applied to the VCM pin and use it to bias the
inputs so that the output common mode voltage equals
VCM, thus no external circuitry is needed. The VCM pin
has been designed to directly interface with the VCM pin
found on Linear Technology’s 16-, 14- and 12-bit high
speed ADC families.
Input Impedance and Matching
The LTC6416 has a high differential input impedance of
12kΩ. The differential inputs may need to be terminated
to a lower value impedance, e.g. 50Ω, in order to provide
an impedance match for the source. Figure 1 shows input
matching using a 1:1 balun, while Figure 2 shows match-
ing using a 1:4 balun. These circuits provide a wideband
impedance match. The balun and matching resistors must
be placed close to the input pins in order to minimize the
rejection due to input mismatch. In Figure 1, the capaci-
tor center-tapping the two 24.9Ω resistors improves high
frequency common mode rejection. As an alternative to
this wideband approach, a narrowband impedance match
can be used at the inputs of the LTC6416 for frequency
selection and/or noise reduction.
The noise performance of the LTC6416 also depends upon
the source impedance and termination. For example, the
input 1:4 balun in Figure 2 improves SNR by adding 6dB
of voltage gain at the inputs. A trade-off between gain
and noise is obvious when constant noise gure circle
and constant gain circle are plotted within the same input
Smith Chart. This technique can be used to determine
the optimal source impedance for a given gain and noise
requirement.
Output Match and Filter
The LTC6416 provides a source resistance of 9Ω at each
output. For testing purposes, Figure 3 and Figure 4 show
the LTC6416 driving a differential 400Ω load impedance
using a 1:1 or 1:4 balun, respectively.
The LTC6416 can drive an ADC directly without external
output impedance matching, but improved performance
can usually be obtained with the addition of a few external
components. Figure 5 shows a typical topology used for
driving the LTC2208 16-bit ADC.
Figure 1. Input Termination for Differential 50Ω Input Impedance Using a 1:1 Balun
VIN
IN+
IN–
3
4
24.9Ω 0.1μF
50Ω
24.9Ω
OUT–
6416 F01
OUT+
7
8
LTC6416
0.1μF
1:1
+
–
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| LTC6417 | 制造商:LINER 制造商全称:Linear Technology 功能描述:50?? Gain Block IF Amplifier n 20MHz to 1700MHz Bandwidth |
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| LTC6417CUDC#TRPBF | 功能描述:IC DIFF 16BIT BUFFER 20-QFN RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LTC6417IUDC#PBF | 功能描述:IC DIFF 16BIT BUFFER 20-QFN RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
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