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參數(shù)資料
| 型號(hào)： | LT6600CS8-20 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Very Low Noise, Differential Amplifier and 20MHz Lowpass Filter |
| 中文描述： | OP-AMP, 30000 uV OFFSET-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 221K |
| 代理商： | LT6600CS8-20 |
LT6600-10
10
6600f
noise and gives a true measure of the S/N achievable in the
system. Conversely, if each output is measured individu-
ally and the noise power added together, the resulting
calculated noise level will be higher than the true differen-
tial noise.
Power Dissipation
The LT6600-10 amplifiers combine high speed with large-
signal currents in a small package. There is a need to
ensure that the dies’s junction temperature does not
exceed 150
°
C. The LT6600-10 package has Pin 6 fused to
the lead frame to enhance thermal conduction when
connecting to a ground plane or a large metal trace. Metal
trace and plated through-holes can be used to spread the
heat generated by the device to the backside of the PC
board. For example, on a 3/32" FR-4 board with 2oz
copper, a total of 660 square millimeters connected to Pin
6 of the LT6600-10 (330 square millimeters on each side
of the PC board) will result in a thermal resistance,
θ
JA
, of
about 85
°
C/W. Without extra metal trace connected to the
APPLICATIU
W
U
U
Example: With the IC removed and the 25
resistors
grounded, measure the total integrated noise (e
S
) of the
spectrum analyzer from 10kHz to 10MHz. With the IC
inserted, the signal source (V
IN
) disconnected, and the
input resistors grounded, measure the total integrated
noise out of the filter (e
O
). With the signal source con-
nected, set the frequency to 1MHz and adjust the ampli-
tude until V
IN
measures 100mV
P-P
. Measure the output
amplitude, V
OUT
, and compute the passband gain
A = V
OUT
/V
IN
. Now compute the input referred integrated
noise (e
IN
) as:
e
e
e
A
IN
O
S
=
(
) –(
)
2
Table 1 lists the typical input referred integrated noise for
various values of R
IN
.
Figure 8 is plot of the noise spectral density as a function
of frequency for an LT6600-10 with R
IN
= 402
using the
fixture of Figure 7 (the instrument noise has been sub-
tracted from the results).
Table 1. Noise Performance
INPUT REFERRED
INTEGRATED NOISE
10kHz TO 10MHz
24
μ
V
RMS
34
μ
V
RMS
56
μ
V
RMS
PASSBAND
GAIN (V/V)
4
2
1
INPUT REFERRED
NOISE dBm/Hz
–149
–146
–142
R
IN
100
200
402
The noise at each output is comprised of a differential
component and a common mode component. Using a
transformer or combiner to convert the differential out-
puts to single-ended signal rejects the common mode
Figure 7
–
+
0.1
μ
F
0.1
μ
F
2.5V
–2.5V
–
+
LT6600-10
3
4
1
7
2
8
5
6
R
IN
R
IN
25
25
6600 F07
SPECTRUM
ANALYZER
INPUT
50
V
IN
COILCRAFT
TTWB-1010
1:1
Figure 8
FREQUENCY (MHz)
0.1
S
R
/
√
H
I
μ
V
R
)
35
30
25
20
15
10
5
0
140
120
100
80
60
40
20
0
1.0
10
100
6600 F08
SPECTRAL DENSITY
INTEGRATED
NOISE
Table 2. LT6600-10 SO-8 Package Thermal Resistance
COPPER AREA
TOPSIDE
BACKSIDE
BOARD AREA
(mm
2
)
(mm
2
)
(mm
2
)
1100
1100
330
330
35
35
35
0
0
0
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
65
°
C/W
85
°
C/W
95
°
C/W
100
°
C/W
105
°
C/W
2500
2500
2500
2500
2500
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