參數(shù)資料
型號(hào)： LT5514EFE
廠商： LINEAR TECHNOLOGY CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： Ultralow Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO20
封裝： 4.40 MM, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 17/20頁(yè)
文件大小： 275K
代理商： LT5514EFE
17
LT5514
5514f
allowing all impedances to be scaled downward by a factor
of two. The NF and power gain remain the same in this
case, but the OIP3 increases by 3dB. Then, with a further
reduction of R
OUT
by a factor of two, the gain and output
noise floor decrease by 3dB, while yielding the same
linearity as for one part. As an added benefit, two LT5514
parts in parallel can drive an R
OUT
reduced by a factor of
four, thus relaxing or eliminating the need in some cases
for an output impedance transformation network.
Low Power Mode
As described in the Circuit Operation section, the LT5514
consists of two parallel gain blocks. These blocks are in-
dependently enabled or disabled. “Low Power mode”
refers to circuit operation with only a single block enabled.
An amplifier in Low Power mode will have the same basic
characteristics as in Standard mode (both gain blocks
enabled), except that the g
m
decreases from 0.3S to 0.15S,
and the maximum output current is halved. In Low Power
mode, the standard LT5514 evaluation board will produce
about 6dB less gain, (because the LT5514’s g
m
is reduced,
while R
IN
and R
OUT
are the same) and 6dB lower OIP3.
LT5514 Characterization
The LT5514’s typical performance data are based on the
test circuits shown in Figures 9 and 10. Figure 9 does not
necessarily reflect the use of the LT5514 in an actual
application. (For that, see the Application Boards section.)
APPLICATIU
W
U
U
–
+
T1
1:1
T1
1:1
C7
47nF
DUT
LT5514
R
OUT
V
CCO
MONITOR
IN
+
IN
–
C2
0.1
μ
F
C1
0.33
μ
F
C8
47nF
ETC-1-
1-13
PGA0 PGA1 PGA2 PGA3
R
SRC
50
R9
35.7
R10
35.7
R7
35.7
R8
35.7
R5
51k
R6
51k
C
OUT
(OPT)
C
(OPT)
V
SRC
V
CC
ENA
ENB
L1
(OPT)
R3
37.4
R1
25
R1
25
R
LOAD
50
R4
37.4
C4
0.1
μ
F
C5
47nF
C6
47nF
L2
(OPT)
C3
4.7
μ
F
5514 F09
V
OSUP
ETC-1-
1-13
ATT =
7.7dB
R
OUT
100
200
R3, R4
37.4
87.4
ATT
9dB
12dB
Figure 9. Characterization Board (Simplified Schematic)
C1
0.47
μ
F
J1
0
T1
1:2
IF
IN
T2
4:1
C2
0.1
μ
F
R
OUT
100
R
LOAD
50
5514 F10
V
OSUP
TC2-1T
TC4-1W
J2
0
TRANSFORMER DEMO BOARD
R
MATCH
255
ENA
V
CC1
GND
GND
IN
+
IN
–
GND
GND
PGA0
PGA1
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
ENB
V
CC2
GND
GND
OUT
–
OUT
+
GND
GND
PGA3
PGA2
C3
4.7
μ
F
IF
OUT
C4
0.1
μ
F
LT5514
PGA1
ENA
ENB
V
CC
PGA0
PGA2 PGA3
Figure 10. Output Transformer Application Board (Simplified Schematic)
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