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參數(shù)資料
| 型號： | LT1819 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| 中文描述： | 1.3GHz的低噪聲，低失真差分ADC驅(qū)動器為140MHz的中頻 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 232K |
| 代理商： | LT1819 |
LTC6401-20
11
640120f
two outputs have the same gain and thus symmetrical
swing. In general, the single-ended input impedance and
termination resistor R
T
are determined by the combination
of R
S
, R
G
and R
F
. For example, when R
S
is 50
Ω
, it is found
that the single-ended input impedance is 200
Ω
and R
T
is
66.5
Ω
in order to match to a 50
Ω
source impedance.
The LTC6401-20 is unconditionally stable. However, the
overall differential gain is affected by both source imped-
ance and load impedance as shown in Figure 4:
The noise performance of the LTC6401-20 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 gain at the inputs. A trade-off between
gain and noise is obvious when constant noise figure
circle and constant gain circle are plotted within the same
A
V
V
R
R
+
R
V
OUT
IN
S
L
L
=
=
+
2000
200 25
Figure 4. Calculate Differential Gain
input Smith Chart, based on which users can choose the
optimal source impedance for a given gain and noise
requirement.
Output Match and Filter
The LTC6401-20 can drive an ADC directly without
external output impedance matching. Alternatively, the
differential output impedance of 25
Ω
can be matched to
higher value impedance, e.g. 50
Ω
, by series resistors or
an LC network.
The internal low pass filter outputs at +OUTF/–OUTF
have a –3dB bandwidth of 590MHz. External capacitor
can reduce the low pass filter bandwidth as shown in
Figure 5. A bandpass filter is easily implemented with
only a few components as shown in Figure 6. Three
39pF capacitors and a 16nH inductor create a bandpass
filter with 165MHz center frequency, –3dB frequencies at
138MHz and 200MHz.
APPLICATIONS INFORMATION
Figure 3. Input Termination for Single-Ended 50
Ω
Input
Impedance
Figure 5. LTC6401-20 Internal Filter Topology Modified for Low
Filter Bandwidth (Three External Capacitors)
640120 F03
IN+
OUT–
IN–
OUT+
100
Ω
R
T
66.5
Ω
0.1
μ
F
0.1
μ
F
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
R
S
50
Ω
R
S
50
Ω
V
IN
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+
0.1
μ
F
R
T
66.5
Ω
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
640120 F04
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
1/2 R
S
1/2 R
S
V
IN
V
OUT
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+
1/2 R
L
1/2 R
L
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
640120 F05
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
8.2pF
8.2pF
12pF(87.5MHz)
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
Figure 6. LTC6401-20 Application Circuit for Bandpass
Filtering (Three External Capacitors, One External Inductor)
LTC2208
10
Ω
10
Ω
4.99
Ω
4.99
Ω
39pF
16nH
39pF
39pF
640120 F06
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
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