LT1010CDD datasheet(11/20 Pages) LINER

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LT1010

1010fc

APPLICATIO S I FOR ATIO

current boost. The appearance is always worse with fast

rise signal generators than in practical applications.

Track and Hold

The 5MHz track and hold shown here has a 400kHz power

bandwidth driving

±10V. A buffered input follower drives

the hold capacitor, C4, through Q1, a low resistance FET

switch. The positive hold command is supplied by TTL

logic with Q3 level shifting to the switch driver, Q2. The

output is buffered by A3.

When the gate is driven to V – for HOLD, it pulls charge out

of the hold capacitor. A compensating charge is put into

the hold capacitor through C3. The step into hold is made

independent of the input level with R7 and adjusted to zero

with R10.

Since internal dissipation can be quite high when driving

fast signals into a capacitive load, using a buffer in a power

package is recommended. Raising buffer quiescent cur-

rent to 40mA with R3 improves frequency response.

This circuit is equally useful as a fast acquisition sample

and hold. An LT1056 might be used for A3 to reduce drift

in hold because its lower slew rate is not usually a problem

in this application.

Current Sources

A standard op amp voltage to current converter with a

buffer to increase output current is shown here. As usual,

LT1010

200

Ω

800

Ω

20pF

INPUT

1010 AI11

OUTPUT 1

OUTPUT 2

–

HA2625

OTHER

SLAVES

The 50

Ω video line splitter here puts feedback on one

buffer with the others slaved. Offset and gain accuracy of

slaves depend on their matching with master.

When driving long cables, including a resistor in series

with the output should be considered. Although it reduces

gain, it does isolate the feedback amplifier from the effects

of unterminated lines which present a resonant load.

When working with wideband amplifiers, special atten-

tion should

always be paid to supply bypassing, stray

capacitance and keeping leads short. Direct grounding of

test probes, rather than the usual ground lead, is abso-

lutely necessary for reasonable results.

The LT1010 has slew limitations that are not obvious from

standard specifications. Negative slew is subject to

glitching, but this can be minimized with quiescent

LT1010

–

LT118A

50pF

150pF

HOLD

HP2810

2N2907

V–

2N5432

2N2222

10k

D2*

*2N2369 EMITTER BASE JUNCTION

OUTPUT

R10

50k

1nF

100pF

10pF

Ω

INPUT

V+

–

LT118A

R11

6.2k

1010 AI12

200k

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