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參數(shù)資料
| 型號： | LT5554IUH#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32 |
| 文件頁數(shù)： | 9/32頁 |
| 文件大?。?/td> | 607K |
| 代理商： | LT5554IUH#TRPBF |
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LT5554
17
5554f
Circuit Operation
The LT5554 is a high dynamic range programmable-gain
amplier. It consists of the following sections:
An input variable attenuator with 50Ω input imped-
ance (four 4dB steps, controlled by PG5, PG6 inputs)
A differential programmable transconductance ampli-
er (32 steps, 0.125dB each controlled by PG0, PG1,
PG2, PG3, PG4 inputs)
Programmable logic blocks
Internal bias (voltage regulators)
Enable/disable circuit
Overdrive protection circuit
Noise Denitions for 50Ω Matched Input
eRS
Source resistor RMS noise voltage:
ek T R
for R
e
nV
Hz
RS
S
RS
2
450
09
==
=
;
,
.
Ω
eN
Equivalent short-circuit input RMS noise voltage
source
iN
Equivalent open-circuit input RMS noise current
source
vN
Equivalent total input RMS noise voltage
source:
vN2 = eN2 + iN2 RS2 (RS = 50Ω)
RTI
Referred-to-input LT5554 noise voltage:
RTI =
(e
+e
+i
R
)
=
v
2
RS
2
N
2
N
2
S
2
N
2
VONOISE LT5554 output noise voltage:
V=
RTI +
e
2
10
ONOISE
2
RS
2
GV
2
20
NF
Noise gure in dB according to any of the fol-
lowing equations:
NF
ei
R
e
NN
S
RS
=+
+
()
=
+
10
1
10
1
22
2
log
log
V
e
RTI
e
N
RS
2
10
1
2
=
+
log
Linearity Denitions for 50Ω Matched Input
IMD3[dBc]
Third-order intermodulation product
(negative value)
IIP3[dBm]
IIP3 = P (per-tone) –
IMD3
2
IN
SFDR[dBm/Hz] SFDR =
2
3
174+IIP3–NF
()
OIP3[dBm]
OIP
P
IMD
IIP
G
OUT
P
3
2
3
==
+
–
APPLICATIONS INFORMATION
DEFINITION OF SPECIFICATIONS
Since no internal feedback network is used between ampli-
er outputs and inputs, the LT5554 is able to offer:
Unconditional stability for I/O reactive loading such
as lters (no isolation output resistors required)
High reverse isolation
The LT5554 is a class-A transconductance amplier. An
input signal voltage is rst converted to an output cur-
rent via the LT5554 internal GM. And then, the output load
(ROUT) converts the output current into an output voltage.
ROUT sets the LT5554 gain and output noise oor. However,
the SFDR performance is almost independent of ROUT for
values of 25Ω to 100Ω.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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