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參數(shù)資料
| 型號： | 660025 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 差分放大器 |
| 英文描述： | Very Low Noise, Differential Amplifier and 2.5MHz Lowpass Filter |
| 中文描述： | 極低噪聲，差分放大器和2.5MHz的低通濾波器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 177K |
| 代理商： | 660025 |
LT6600-2.5
7
660025i
APPLICATIU
W
U
U
In Figure 3 the LT6600-2.5 is providing 12dB of gain. The
common mode output voltage is set to 2V.
Use Figure 4 to determine the interface between the
LT6600-2.5 and a current output DAC. The gain, or “trans-
impedance,” is defined as A = V
OUT
/I
IN
. To compute the
transimpedance, use the following equation:
A
R
2
R
(
R
=
+
)
( )
1580
1
1
By setting R1 + R2 = 1580
, the gain equation reduces to
A = R1(
).
The voltage at the pins of the DAC is determined by R1,
R2, the voltage on Pin 7 and the DAC output current.
Consider Figure 4 with R1 = 49.9
and R2 = 1540
. The
voltage at Pin 7 is 1.65V. The voltage at the DAC pins is
given by:
V
V
R
2 1580
48 3
.
R
R
I
R
R
R
R
mV I
26
DAC
PIN
IN
IN
=
+
+
+
=
7
1
1
1
1
2
2
I
IN
is I
IN+
or I
IN–
. The transimpedance in this example is
49.6
.
Evaluating the LT6600-2.5
The low impedance levels and high frequency operation of
the LT6600-2.5 require some attention to the matching
networks between the LT6600-2.5 and other devices. The
previous examples assume an ideal (0
) source imped-
ance and a large (1k
) load resistance. Among practical
examples where impedance must be considered is the
evaluation of the LT6600-2.5 with a network analyzer.
Figure 5
Figure 5 is a laboratory setup that can be used to charac-
terize the LT6600-2.5 using single-ended instruments
with 50
source impedance and 50
input impedance.
For a 12dB gain configuration the LT6600-2.5 requires a
402
source resistance yet the network analyzer output is
calibrated for a 50
load resistance. The 1:1 transformer,
53.6
and 388
resistors satisfy the two constraints
above. The transformer converts the single-ended source
into a differential stimulus. Similarly, the output of the
LT6600-2.5 will have lower distortion with larger load
resistance yet the analyzer input is typically 50
. The 4:1
turns (16:1 impedance) transformer and the two 402
resistors of Figure 5, present the output of the LT6600-2.5
with a 1600
differential load, or the equivalent of 800
to ground at each output. The impedance seen by the
network analyzer input is still 50
, reducing reflections in
the cabling between the transformer and analyzer input.
Differential and Common Mode Voltage Ranges
The rail-to-rail output stage of the LT6600-2.5 can process
large differential signal levels. On a 3V supply, the output
signal can be 5.1V
P-P
. Similarly, a 5V supply can support
signals as large as 8.8V
P-P
. To prevent excessive power
dissipation in the internal circuitry, the user must limit
differential signal levels to 9V
P-P
.
The two amplifiers inside the LT6600-2.5 have indepen-
dent control of their output common mode voltage (see
the “Block Diagram” section). The following guidelines
will optimize the performance of the filter.
Pin 7 can be allowed to float; Pin 7 must be bypassed to an
AC ground with a 0.01
μ
F capacitor or some instability may
be observed. Pin 7 can be driven from a low impedance
Figure 4
–
+
0.1
μ
F
3.3V
–
+
LT6600-2.5
3
4
1
7
2
8
0.01
μ
F
CURRENT
OUTPUT
DAC
5
V
OUT+
V
OUT–
660025 F04
6
R2
R1
I
IN–
I
IN+
R2
R1
–
+
0.1
μ
F
0.1
μ
F
2.5V
–2.5V
–
+
LT6600-2.5
3
4
1
7
2
8
5
6
660025 F05
402
402
NETWORK
ANALYZER
INPUT
50
COILCRAFT
TTWB-16A
4:1
NETWORK
ANALYZER
SOURCE
COILCRAFT
TTWB-1010
1:1
50
53.6
388
388
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