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参数资料
| 型号： | LTC6604IUFF-10#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQCC34 |
| 封装： | 4 X 7 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-34 |
| 文件页数： | 2/16页 |
| 文件大小： | 209K |
| 代理商： | LTC6604IUFF-10#TRPBF |
LT6604-10
10
660410fa
APPLICATIONS INFORMATION
In Figure 3 the LT6604-10 is providing 12dB of gain. The
gain resistor has an optional 62pF in parallel to improve
the passband atness near 10MHz. The common mode
output voltage is set to 2V.
Use Figure 4 to determine the interface between the
LT6604-10 and a current output DAC. The gain, or “tran-
simpedance,” is dened as A = VOUT/IIN. To compute the
transimpedance, use the following equation:
A =
402 R1
(R1+R2)
(Ω)
By setting R1 + R2 = 402Ω, the gain equation reduces to
A = R1 (Ω).
The voltage at the pins of the DAC is determined by R1, R2,
the voltage on VMID and the DAC output current (IIN+ or
IIN–). Consider Figure 4 with R1 = 49.9Ω and R2 = 348Ω.
The voltage at VMID, for VS = 3.3V, is 1.65V. The voltage at
the DAC pins is given by:
VDAC = VMID
R1
R1+R2+ 402
+IIN
R1R2
R1+R2
=103mV +IIN 43.6Ω
IIN is IIN+ or IIN–. The transimpedance in this example is
50.4Ω.
Evaluating the LT6604-10
The low impedance levels and high frequency operation
of the LT6604-10 require some attention to the matching
networks between the LT6604-10 and other devices. The
previous examples assume an ideal (0Ω) source impedance
and a large (1k) load resistance. Among practical examples
where impedance must be considered is the evaluation of
the LT6604-10 with a network analyzer.
–
+
100Ω
0.1μF
0.01μF
5V
–
+
VIN
–
VIN
+
25
27
4
34
6
2
29
7
660410 F03
VOUT
+
VOUT
–
62pF
+
– 2V
V
t
3
2
1
0
VIN
+
VIN
–
V
t
3
2
1
0
VOUT
+
VOUT
–
500mVP-P (DIFF)
1/2
LT6604-10
–
+
0.1μF
0.01μF
3.3V
–
+
25
27
VOUT
+
IIN
+
IIN
–
VOUT
–
4
34
6
2
29
7
660410 F04
CURRENT
OUTPUT
DAC
R1
R2
=
VOUT
+ – VOUT–
IIN
+ – IIN–
402 R1
R1 + R2
1/2
LT6604-10
Figure 3
Figure 4
–
+
0.1μF
2.5V
–2.5V
–
+
25
27
4
34
6
2
29
7
660410 F05
402Ω
NETWORK
ANALYZER
INPUT
50Ω
COILCRAFT
TTWB-16A
4:1
NETWORK
ANALYZER
SOURCE
COILCRAFT
TTWB-1010
1:1
50Ω
53.6Ω
388Ω
1/2
LT6604-10
Figure 5
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