lt6600cs8-5-trpbf Linear Technology Corporation, lt6600cs8-5-trpbf Datasheet - Page 13

• Manufacturer Part Number: lt6600cs8-5-trpbf
• Description: Very Low Noise, Differential Amplifier And 10mhz Lowpass Filter
• Manufacturer: Linear Technology Corporation

connected to the V
resistance will be around 105°C/W. Table 2 can be used as
a guide when considering thermal resistance.
Junction temperature, T
temperature, T
dissipation is the product of supply voltage, V
supply current, I
given by:
where the supply current, I
load impedance, temperature and common mode volt-
ages.
For a given supply voltage, the worst-case power dissi-
pation occurs when the differential input signal is maxi-
mum, the common mode currents are maximum (see
APPLICATIO S I FOR ATIO
T
J
= T
A
+ (P
D
A
, and power dissipation, P
S
• θ
. Therefore, the junction temperature is
–
JA
U
pin to provide a heat sink, the thermal
) = T
J
, is calculated from the ambient
A
U
S
+ (V
, is a function of signal level,
S
• I
W
S
• θ
JA
)
D
. The power
U
S
, and
Applications Information regarding common mode DC
currents), the load impedance is small and the ambient
temperature is maximum. To compute the junction tem-
perature, measure the supply current under these worst-
case conditions, estimate the thermal resistance from
Table 2, then apply the equation for T
the circuit in Figure 3 with DC differential input voltage of
250mV, a differential output voltage of 1V, no load resis-
tance and an ambient temperature of 85°C, the supply
current (current into V
PC board layout with a 35mm
100°C/W. The resulting junction temperature is:
When using higher supply voltages or when driving small
impedances, more copper may be necessary to keep T
below 150°C.
T
J
= T
A
+ (P
D
• θ
JA
) = 85 + (5 • 0.0489 • 100) = 109°C
+
) measures 48.9mA. Assuming a
2
copper trace, the θ
J
. For example, using
LT6600-10
13
JA
6600fa
is
J