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參數(shù)資料
| 型號(hào)： | LT5514 |
| 廠商： | Linear Technology Corporation |
| 元件分類(lèi)： | ADC |
| 英文描述： | Ultralow Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain |
| 中文描述： | 超低失真IF放大器/ ADC的數(shù)字控制增益驅(qū)動(dòng) |
| 文件頁(yè)數(shù)： | 18/20頁(yè) |
| 文件大?。?/td> | 275K |
| 代理商： | LT5514 |
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18
LT5514
5514f
Rather, it represents a compromise that most accurately
measures the actual operation of the part by itself,
undistorted by the artifacts of the impedance transformation
network, or by external bandwidth limiting factors. Balun
transformers are used to interface with single-ended test
equipment. Input and output resistive attenuators (not
shown) provide broadband I/O impedance control. The
L1, L2 inductors are selected for maximally flat AC output
response. C
OUT
(normally open) shows the placement of
capacitive loading when this is specified as a
characterization variable. The V
CCO
monitor pin allows
setting the output DC level (5V typical) by adjusting
voltage V
OSUP
.
Application (Demo) Boards
The LT5514 demo boards are provided in the versions
shown in Figure 10 (with output transformer) and Fig-
ure11 (without output transformer). All I/O signal ports
are matched to 50
. Moreover, 1k resistors (not shown)
connect all six control pins (ENA, ENB, PGA0, PGA1,
PGA2, PGA3) to V
CC
, such that the LT5514 is shipped in
maximum gain state and with both amplifier blocks en-
abled (Standard mode).
The gain setting can be changed by connecting the control
pins to ground. Test points (TP1, TP2, TP3) are provided
to monitor the input and output DC bias voltage. Jumper
J1 can be removed when differential input is desired, but
APPLICATIU
W
U
U
in that case, T1 should be changed to a 1:1 center-tap
transformer to preserve 50
input matching. The demo
board is shipped with optional output back-matching
resistor R
MATCH
= 255
. This results in a net output load,
R
OUT
= 100
, presented to the LT5514.
The Output Transformer Application Board (Figure 10) is
one example of an output impedance transformation
(T2 transformer). For the Typical Performance Character-
istics curves, all linearity tests are performed on this
board. By removing R
MATCH
, the performance with R
OUT
= 200
can be evaluated (provided the lack of impedance
back-matching is suitably remedied). Measured OIP3 for
both cases, R
OUT
= 100
and 200
, is shown in Figure 12.
C1
0.47
μ
F
J1
0
T1
1:2
IF
IN
C2
0.1
μ
F
R
OUT
50
R
100
5514 F11
V
OSUP
TC2-1T
DIFFERENTIAL OUTPUT
RESISTIVE DEMO BOARD
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
R1
50
R2
50
C3
4.7
μ
F
IF
OUT
C4
0.1
μ
F
C5
47nF
C6
47nF
LT5514
PGA1
ENA
ENB
V
CC
PGA0
PGA2 PGA3
J2
0PEN
Figure 11. Wideband Differential Output Application Board (Simplified Schematic)
FREQUENCY (MHz)
0
O
46
49
52
200
5514 F12
43
40
34
50
100
150
37
58
55
DUT R
MATCH
= 255
BOARD R
MATCH
= 255
DUT R
BOARD R
MATCH
= OPEN
Figure 12. Typical OIP3 for Transformer Board
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