termination resistor RT <" />
參數(shù)資料
型號(hào)： LTC6400IUD-20#PBF
廠商： Linear Technology
文件頁數(shù)： 4/16頁
文件大小： 0K
描述： IC ADC DRIVER DIFF 16-QFN
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
產(chǎn)品目錄頁面： 1322 (CN2011-ZH PDF)
LTC6400-20
12
640020f
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 202Ω and RT is
66.5Ω in order to match to a 50Ω source impedance.
The LTC6400-20 is unconditionally stable. However, the
overall differential gain is affected by both source imped-
ance and load impedance as shown in Figure 4:
A
V
VR
R
V
OUT
IN
S
L
==
++
2000
200 25
The noise performance of the LTC6400-20 also depends
upon the source impedance and termination. For example,
an input 1:4 balun transformer 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, based on which users can
choose the optimal source impedance for a given gain
and noise requirement.
Figure 4. Calculate Differential Gain
Output Match and Filter
The LTC6400-20 can drive an ADC directly without
external output impedance matching. Alternatively, the
differential output impedance of 25Ω can be matched to
higher value impedance, e.g. 50Ω, by series resistors or
an LC network.
The internal low pass lter outputs at +OUTF/–OUTF
have a –3dB bandwidth of 590MHz. External capacitors
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 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
APPLICATIONS INFORMATION
Figure 3. Input Termination for Single-Ended 50Ω Input
Impedance
Figure 5. LTC6400-20 Internal Filter Topology Modied for Low
Filter Bandwidth (Three External Capacitors)
640020 F03
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
100
Ω
RT
66.5
Ω
0.1
μF
0.1
μF
12.5
Ω
1000
Ω
LTC6400-20
100
Ω
RS
50
Ω
RS
50
Ω
VIN
1000
Ω
12.5
Ω
50
Ω
50
Ω
1.7pF
13
14
15
16
7
5
6
8
+
–
0.1
μF
RT
66.5
Ω
640020 F04
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
100
Ω
12.5
Ω
1000
Ω
LTC6400-20
100
Ω
1/2 RS
VIN
VOUT
1000
Ω
12.5
Ω
50
Ω
50
Ω
1.7pF
13
14
15
16
7
5
6
8
+
–
1/2 RL
640020 F05
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6400-20
100
Ω
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
8.2pF
12pF
FILTERED OUTPUT
(87.5MHz)
+OUT
+OUTF
–OUTF
–OUT
+IN
–IN
1.7pF
Figure 6. LTC6400-20 Internal Filter Topology Modied
for Bandpass Filtering (Three External Capacitors, One
External Inductor)
640020 F06
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6400-20
LTC2208
100
Ω
1000
Ω
12.5
Ω
10
Ω
10
Ω
4.99
Ω
4.99
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
39pF
16nH
39pF
+OUT
+OUTF
–OUTF
–OUT
+IN
–IN
1.7pF
39pF
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