参数资料
| 型号： | LTC6400CUD-26#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC DRIVER DIFF 16-QFN |
| 标准包装： | 121 |
| 类型： | ADC 驱动器 |
| 应用： | 数据采集 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
LTC6400-26
11
640026fa
The LTC6400-26 is unconditionally stable, i.e. differential
stability factor Kf>1 and stability measure B1>0. However,
the overall differential gain is affected by both source
impedance and load impedance as shown in Figure 4:
A
V
VR
R
V
OUT
IN
S
L
==
++
1000
50 25
The noise performance of the LTC6400-26 also depends
upon the source impedance and termination. 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, based on which users can
choose the optimal source impedance for a given gain
and noise requirement.
Output Impedance Match and Filter
The LTC6400-26 can drive an ADC directly without external
output impedance matching. Alternatively, the differential
output impedance of 25
Ω can be made larger, e.g. 50Ω,
by series resistors or LC network.
Figure 4. Calculate Differential Gain
APPLICATIONS INFORMATION
Figure 3. Input Termination for Single-Ended
50
Ω Input Impedance
The internal low pass lter outputs at +OUTF/–OUTF
have a –3dB bandwidth of 590MHz. External capacitor
can reduce the low pass lter bandwidth as shown in
Figure 5. A bandpass lter is easily implemented with
only a few components as shown in Figure 6. Three
39pF capacitors and a 16nH inductor create a bandpass
lter with 165MHz center frequency, –3dB frequencies at
138MHz and 200MHz.
Output Common Mode Adjustment
The LTC6400-26’s output common mode voltage is set
by the VOCM pin, which is a high impedance input. The
output common mode voltage is capable of tracking VOCM
in a range from 1V to 1.6V. Bandwidth of VOCM control is
typically 15MHz, which is dominated by a low pass lter
connected to the VOCM pin and is aimed to reduce com-
mon mode noise generation at the outputs. The internal
common mode feedback loop has a –3dB bandwidth of
400MHz, allowing fast rejection of any common mode
output disturbance. The VOCM pin should be tied to a DC
bias voltage with a 0.1μF bypass capacitor. When interfac-
ing with A/D converters such as the LTC22xx families, the
VOCM pin can be connected to the VCM pin of the ADC.
Driving A/D Converters
The LTC6400-26 has been specically designed to interface
directly with high speed A/D converters. Figure 7 shows the
LTC6400-26 with a single-ended input driving the LTC2208,
which is a 16-bit, 130Msps ADC. Two external 5
Ωresistors
help eliminate potential resonance associated with bond
wires of either the ADC input or the driver output. VOCM
of the LTC6400-26 is connected to VCM of the LTC2208
at 1.25V. Alternatively, a single-ended input signal can be
Figure 5. LTC6400-26 Internal Filter Topology Modied
for Low Filter Bandwidth (Three External Capacitors)
640026 F03
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25Ω
RT
150Ω
0.1μF
12.5Ω
500Ω
LTC6400-26
25Ω
RS
50Ω
VIN
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
0.1μF
37.4Ω
640026 F04
+OUT
+OUTP
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25Ω
12.5Ω
500Ω
LTC6400-26
25Ω
1/2 RS
VIN
VOUT
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
1/2 RL
640026 F05
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25Ω
12.5Ω
500Ω
LTC6400-26
25Ω
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
8.2pF
12pF
FILTERED OUTPUT
(87.5MHz)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6400CUD-26-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.9GHz Low Noise, Low Distortion Differential ADC Driver for DC-300MHz |
| LTC6400CUD-8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.4GHz Low Noise, Low Distortion Differential ADC |
| LTC6400CUD-8#PBF | 功能描述:IC ADC DRIVER DIFF 2.2GHZ 16QFN RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LTC6400CUD-8#TR | 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 2.2GHZ, QFN-16, No. of Amplifiers:1, Input Offset Voltage:5mV, Gain dB Max:8dB, Bandwidth:2.2GHz, Amplifier Case Style:QFN, No. of Pins:16, Supply Voltage Range:2.85V to 3.5V, Slew Rate:3810V/s, Supply Current:85mA , RoHS Compliant: No |
| LTC6400CUD-8#TRPBF | 功能描述:IC ADC DRIVER DIFF 2.2GHZ 16QFN RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
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