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參數資料
| 型號： | LT1994 |
| 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驅動器為140MHz的中頻 |
| 文件頁數： | 5/16頁 |
| 文件大?。?/td> | 232K |
| 代理商： | LT1994 |
LTC6401-20
5
640120f
AC ELECTRICAL CHARACTERISTICS
floating, V
OCM
= 1.25V,
E
N
A
B
L
E = 0V, No R
L
unless otherwise noted.
FREQUENCY (MHz)
0
P
100
0
–100
–200
–300
–400
G
1.5
1.2
0.9
0.6
0.3
0
200
400
600
800
1000
640120 G03
PHASE
GROUP DELAY
TEST CIRCUIT B
FREQUENCY (MHz)
10
100
1000
N
1.0
0.8
–0.8
0.6
–0.6
0.4
–0.4
0.2
–0.2
0
–1.0
640120 G02
TEST CIRCUIT B
FREQUENCY (MHz)
10
100
1000
3000
G
25
20
15
10
5
0
640120 G01
TEST CIRCUIT B
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Input pins (+IN, –IN) are protected by steering diodes to either
supply. If the inputs go beyond either supply rail, the input current should
be limited to less than 10mA.
Note 3:
The LTC6401C and LTC6401I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 4:
The LTC6401C is guaranteed to meet specified performance from
0°C to 70°C. It is designed, characterized and expected to meet specified
performance from –40°C to 85°C but is not tested or QA sampled at these
temperatures. The LTC6401I is guaranteed to meet specified performance
from –40°C to 85°C.
Note 5:
Input and output baluns used. See Test Circuit A.
Note 6:
Measured using Test Circuit B.
Note 7:
Since the LTC6401-20 is a feedback amplifier with low output
impedance, a resistive load is not required when driving an AD converter.
Therefore, typical output power is very small. In order to compare the
LTC6401-20 with amplifiers that require 50
Ω
output load, the LTC6401-20
output voltage swing driving a given R
L
is converted to OIP
3
and P
1dB
as
if it were driving a 50
Ω
load. Using this modified convention, 2V
P-P
is by
definition equal to 10dBm, regardless of the actual R
L
.
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Response
Gain 0.1dB Flatness
S21 Phase and Group Delay vs
Frequency
SYMBOL
IMD
3,140M
PARAMETER
Third-Order Intermodulation
(f1 = 139.5MHz f2 = 140.5MHz)
CONDITIONS
2V
P-P,OUT
Composite, R
L
= 400
Ω
2V
P-P,OUT
Composite, No R
L
2V
P-P,OUTFILT
Composite, No R
L
2V
P-P,OUT
Composite, No R
L
(Note 7)
MIN
TYP
–71
–74
–72
41
MAX
UNITS
dBc
dBc
dBc
dBm
OIP
3,140M
Third-Order Output Intercept Point
(f1 = 139.5MHz f2 = 140.5MHz)
1dB Compression Point
Noise Figure
Input Referred Voltage Noise Density
Output Referred Voltage Noise Density Includes Resistors (Short Inputs)
Third-Order Intermodulation
(f1 = 130MHz f2 = 150MHz) Measure
at 170MHz
P
1dB,140M
NF
140M
e
IN,140M
e
ON,140M
IMD
3,130M/150M
R
L
= 375
Ω
(Notes 5, 7)
R
L
= 375
Ω
(Note 5)
Includes Resistors (Short Inputs)
18
6.4
2.1
22
–69
dBm
dB
nV/√
H
z
nV/√
H
z
dBc
2V
P-P,OUT
Composite, R
L
= 375
Ω
(Note 5)
–61
Specifications are at T
A
= 25°C. V
+
= 3V, V
–
= 0V, +IN and –IN
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