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參數(shù)資料
| 型號(hào)： | LT6604IUFF-5#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQCC34 |
| 封裝： | 4 X 7 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-34 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 182K |
| 代理商： | LT6604IUFF-5#TRPBF |
LT6604-5
10
66045fa
APPLICATIONS INFORMATION
Use Figure 4 to determine the interface between the
LT6604-5 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
=
806 R1
R1
+R2
Ω
By setting R1 + R2 = 806Ω, 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.
Consider Figure 4 with R1 = 49.9Ω and R2 = 750Ω. The
voltage at VMID, for VS = 3.3V, is 1.65V. The voltage at the
DAC pins is given by:
VDAC = VMID
R1
+R2+806
+IIN
R1R2
R1
+R2
= 51mV +IIN46.8Ω
Evaluating the LT6604-5
The low impedance levels and high frequency operation
of the LT6604-5 require some attention to the matching
networks between the LT6604-5 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 LT6604-5 with a network analyzer.
Figure 5 is a laboratory setup that can be used to character-
ize the LT6604-5 using single-ended instruments with 50Ω
source impedance and 50Ω input impedance. For a unity
gain conguration the LT6604-5 requires an 806Ω source
resistance yet the network analyzer output is calibrated
for a 50Ω load resistance. The 1:1 transformer, 51.1Ω
and 787Ω resistors satisfy the two constraints above.
The transformer converts the single-ended source into a
differential stimulus. Similarly, the output of the LT6604-5
will have lower distortion with larger load resistance yet
the analyzer input is typically 50Ω. The 4:1 turns (16:1
impedance) transformer and the two 402Ω resistors of
Figure 5, present the output of the LT6604-5 with a 1600Ω
differential load, or the equivalent of 800Ω to ground at
each output. The impedance seen by the network analyzer
input is still 50Ω, reducing reections in the cabling be-
tween the transformer and analyzer input.
Differential and Common Mode Voltage Ranges
The differential ampliers inside the LT6604-5 contain
circuitry to limit the maximum peak-to-peak differential
voltage through the lter. This limiting function prevents
excessive power dissipation in the internal circuitry and
provides output short-circuit protection. The limiting
function begins to take effect at output signal levels
above 2VP-P and it becomes noticeable above 3.5VP-P.
This is illustrated in Figure 6; the LT6604-5 channel was
congured with unity passband gain and the input of the
lter was driven with a 1MHz signal. Because this voltage
limiting takes place well before the output stage of the
lter reaches the supply rails, the input/output behavior
of the IC shown in Figure 6 is relatively independent of
the power supply voltage.
–
+
0.1μF
3.3V
–
+
0.01μF
CURRENT
OUTPUT
DAC
VOUT
+
VOUT
–
66045 F04
R2
R1
IIN
–
IIN
+
R2
R1
=
VOUT
+ – VOUT–
IIN
+ – IIN–
806 R1
R1 + R2
25
27
4
34
6
2
29
7
1/2
LT6604-5
Figure 4
–
+
0.1μF
2.5V
–2.5V
–
+
66045 F05
402Ω
NETWORK
ANALYZER
INPUT
50Ω
COILCRAFT
TTWB-16A
4:1
NETWORK
ANALYZER
SOURCE
COILCRAFT
TTWB-1010
1:1
50Ω
51.1Ω
787Ω
25
27
4
34
6
2
29
7
1/2
LT6604-5
Figure 5
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