LTC6406 datasheet(13/24 Pages) LINER

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LTC6406

6406fb

APPLICATIONS INFORMATION

Figure 2. AC Test Circuit (–3dB BW Testing)

0.01μF

–

SHDN

V+

V–

V+

V–

V+

V–

VOCM

VSHDN

VVOCM

VOCM

V–

V+

V–

6406 F02

LTC6406

SHDN

0.1μF

0.01μF

RT CHOSEN SO

THAT RT||RI = 100Ω

0.1μF

100Ω

50Ω

MINI-CIRCUITS

TCM4-19

MINI-CIRCUITS

TCM4-19

V+OUT

V–OUT

V+

0.1μF

–

VIN

50Ω

VTIP

–IN

+OUT

+OUTF

+IN

–OUT

100k

–OUTF

V–OUTF

V+OUTF

V+

1.25pF

50Ω

V–IN

V+IN

output phase balancing to reduce even order harmonics,

and centers each individual output about the potential set

by the VOCM pin.

OUTCM = VOCM =

V+OUT + V–OUT

The outputs (+OUT and –OUT) of the LTC6406 are capable

of swinging from close to ground to typically 1V below

V+. They can source or sink up to approximately 55mA of

current. Each output is designed to directly drive up to 5pF

to ground. Higher load capacitances should be decoupled

with at least 15

Ω of series resistance from each output.

Input Pin Protection

The LTC6406 input stage is protected against differential

input voltages which exceed 1.4V by two pairs of series

diodes connected back to back between +IN and –IN. In

addition, the input pins have clamping diodes to either

power supply. If the input pins are over-driven, the current

should be limited to under 10mA to prevent damage to the

IC. The LTC6406 also has clamping diodes to either power

supply on the VOCM, VTIP and SHDN pins and if driven to

voltages which exceed either supply, they too, should be

current limited to under 10mA.

SHDN Pin

The SHDN pin is a CMOS logic input with a 100k internal

pull-up resistor. If the pin is driven low, the LTC6406 powers

down with Hi-Z outputs. If the pin is left unconnected or

driven high, the part is in normal active operation. Some

care should be taken to control leakage currents at this pin

to prevent inadvertently putting the LTC6406 into shutdown.

The turn-on and turn-off time between the shutdown and

active states are typically less than 1μs.

LTC6406 Datasheet(PDF) 13 Page - Linear Technology

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