參數(shù)資料
型號(hào)： LTC6400IUD-8#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 2/16頁(yè)
文件大?。?/td> 0K
描述： IC ADC DRIVER DIFF 2.2GHZ 16QFN
標(biāo)準(zhǔn)包裝： 121
類型： ADC 驅(qū)動(dòng)器
應(yīng)用： 數(shù)據(jù)采集
安裝類型： 表面貼裝
封裝/外殼： 16-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 16-QFN-EP（3x3）
包裝： 管件
LTC6400-8
10
64008f
Figure 4. Calculate Differential Gain
APPLICATIONS INFORMATION
Figure 3. Input Termination for Single-Ended 50Ω Input
Impedance
The LTC6400-8 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
400 25
ThenoiseperformanceoftheLTC6400-8alsodependsupon
the source impedance and termination. For example, an
input 1:4 transformer in Figure 2 improves SNR by adding
6dB 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 input Smith Chart, based
on which users can choose the optimal source impedance
for a given gain and noise requirement.
64008 F03
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
200Ω
RT
59.0Ω
0.1μF
12.5Ω
500Ω
LTC6400-8
200Ω
RS
50Ω
VIN
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
0.1μF
27.4Ω
64008 F04
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
200Ω
12.5Ω
500Ω
LTC6400-8
200Ω
1/2 RS
VIN
VOUT
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
1/2 RL
order to minimize the reection due to input mismatch.
Alternatively, one could apply a narrowband impedance
match at the inputs of the LTC6400-8 for frequency selec-
tion and/or noise reduction.
Referring to Figure 3, LTC6400-8 can be easily congured
for single-ended input and differential output without a
balun. The signal is fed to one of the inputs through a
matching network while the other input is connected to
the same matching network and a source resistor. Because
the return ratios of the two feedback paths are equal, the
two outputs have the same gain and thus symmetrical
swing. In general, the single-ended input impedance and
termination resistor RT are determined by the combination
of RS, RG and RF. For example, when RS is 50Ω, it is found
that the single-ended input impedance is 322Ω and RT is
59Ω in order to match to a 50Ω source impedance.
Figure 1. Input Termination for Differential 50Ω Input Impedance
Using Shunt Resistor
Figure 2. Input Termination for Differential 50Ω Input Impedance
Using a Balun
64008 F01
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
200Ω
57.6Ω
12.5Ω
500Ω
LTC6400-8
200Ω
25Ω
VIN
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
64008 F02
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
MINI CIRCUITS
TCM4-19
–IN
200Ω
12.5Ω
500Ω
LTC6400-8
200Ω
25Ω
402Ω
25Ω
VIN
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
1:4
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