LT1208 Linear Technology, LT1208 Datasheet - Page 8

• Manufacturer Part Number: LT1208
• Description: Dual and Quad 45MHz/ 400V/us Op Amps
• Manufacturer: Linear Technology

LT1208/LT1209
A
8
Low Voltage Operation
The LT1208/LT1209 are functional at room temperature
with only 3V of total supply voltage. Under this condition,
however, the undistorted output swing is only 0.8V
more realistic condition is operation at 2.5V supplies (or
5V and ground). Under these conditions, at room tem-
perature, the typical input common-mode range is 1.9V to
–1.3V (for a V
wave can be faithfully reproduced. With 5V total supply
voltage the gain-bandwidth is reduced to 26MHz and the
slew rate is reduced to 135V/ s.
PPLICATI
A
A
V
V
= 1
= –1
Large-Signal Transient Response
Large-Signal Transient Response
OS
O
change of 1mV), and a 5MHz, 2V
U
S
I FOR ATIO
U
W
1208/09 AI04
1208/09 AI06
U
P-P
P-P
sine
. A
Power Dissipation
The LT1208/LT1209 combine high speed and large output
current drive in small packages. Because of the wide
supply voltage range, it is possible to exceed the maxi-
mum junction temperature under certain conditions.
Maximum junction temperature (T
ambient temperature (T
follows:
Maximum power dissipation occurs at the maximum
supply current and when the output voltage is at 1/2 of
either supply voltage (or the maximum swing if less than
1/2 supply voltage).
For each amplifier P
Example: LT1208 in S8 at 70 C, V
DAC Current-to-Voltage Converter
The wide bandwidth, high slew rate and fast settling time
of the LT1208/LT1209 make them well-suited for current-
to-voltage conversion after current output D/A converters.
A typical application with a DAC-08 type converter (full-
scale output of 2mA) uses a 5k feedback resistor. A 7pF
compensation capacitor across the feedback resistor is
used to null the pole at the inverting input caused by the
DAC output capacitance. The combination of the LT1208/
LT1209 and DAC settles to less than 40mV (1LSB) in
140ns for a 10V step.
P
LT1208CN8: T
LT1208CS8: T
LT1209CN:
LT1209CS:
P
T
DMAX
J
DMAX
= 70°C + (2
= (V
= (20V)(10.5mA) +
+
– V
T
T
J
J
J
J
DMAX
= T
= T
= T
= T
–
260mW)(150°C/W) = 148°C
)(I
A
A
A
A
A
SMAX
) and power dissipation (P
+ (P
+ (P
+ (P
+ (P
is as follows:
) +
D
D
D
D
500
(5V)
(0.5V
100 C/W)
150 C/W)
70 C/W)
100 C/W)
J
S
) is calculated from the
= 10V, R
R
2
L
+
= 260mW
)
2
L
= 500
D
) as