LT6604 Linear Technology Corporation, LT6604 Datasheet - Page 13

• Manufacturer Part Number: LT6604
• Description: Dual Very Low Noise, Differential Ampli?er And 5mhz Lowpass Filter
• Manufacturer: Linear Technology Corporation

APPLICATIONS INFORMATION
Information regarding Common Mode DC Currents), the
load impedance is small and the ambient temperature is
maximum. To compute the junction temperature, measure
the supply current under these worst-case conditions, use
43°C/W as the package thermal resistance, then apply the
equation for T
with DC differential input voltage of 250mV, a differential
output voltage of 1V, 1k load resistance and an ambient
TYPICAL APPLICATIONS
(1V-1.5V)
Dual, Matched, 5MHz Lowpass Filter
J
V
. For example, using the circuit in Figure 3
OCM
Q
I
IN
IN
0.01μF
0.01μF
R
R
R
R
IN
IN
IN
IN
34
12
14
10
4
6
2
8
–
–
+
+
1/2
LT6604-5
1/2
LT6604-5
3V
3V
25
7
17
24
+
+
–
–
0.1μF
0.1μF
27
29
19
21
GAIN =
Q
I
OUT
OUT
806Ω
R
IN
temperature of 85°C, the supply current (current into V
measures 32.2mA per channel. The resulting junction
temperature is: T
• 43) = 99°C. The thermal resistance can be affected by
the amount of copper on the PCB that is connected to
V
the exposed pad is not connected to a large ground plane
with a number of vias.
–
. The thermal resistance of the circuit can increase if
30
25
20
15
10
5
0
–135
J
–134.5
5MHz Phase Distribution
= T
A
–134
5MHz PHASE (DEG)
+ (P
(50 Units)
–133.5
D
• θ
–133 –132.5
JA
) = 85 + (5 • 2 • 0.0322
–132 –131.5
LT6604-5
66045 TA02
13
66045f
+
)