LT1208/LT1209

8

S

APPLICATI

I FOR ATIO

Low Voltage Operation

The LT1208/LT1209 are functional at room temperature

with only 3V of total supply voltage. Under this condition,

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

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/

µs.

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.

follows:

LT1209CN:

LT1209CS:

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).

Example: LT1208 in S8 at 70

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.

Large-Signal Transient Response

1208/09 AI04

1208/09 AI06

Large-Signal Transient Response

2

= 260mW

(5V)

2

500

Ω