LTC1417IGN datasheet(12/32 Pages) LINER

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LTC1417

LT1360: 50MHz Voltage Feedback Amplifier. 3.8mA sup-

ply current,

±2.5V to ±15V supplies. High AVOL, 1mV

offset and 80ns settling to 1mV (4V step, inverting and

noninverting configurations) make it suitable for fast DC

applications. Excellent AC specifications. Dual and quad

versions are available as LT1361 and LT1362.

LT1468: 90MHz Voltage Feedback Amplifier.

±5V to ±15V

supplies. Lower distortion and noise. Settles to 0.01% in

770ns. Distortion is –115dB to 20kHz.

LT1498/LT1499: 10MHz, 6V/

µs, Dual/Quad Rail-to-Rail

Input and Output Op Amps. 1.7mA supply current per

amplifier. 2.2V to

±15V supplies. Good AC performance,

input noise voltage = 12nV/

√Hz (typ).

LT1630/LT1631: 30MHz, 10V/

µs, Dual/Quad Rail-to-Rail

Input and Output Precision Op Amps. 3.5mA supply

current per amplifier. 2.7V to

±15V supplies. Best AC

performance, input noise voltage = 6nV/

√Hz (typ),

THD = – 86dB at 100kHz.

LT1813: Dual 100MHz 750V/

µs 3mA VFA. 5V to ±5V

supplies. Distortion is – 86dB to 100kHz and – 77dB to

1MHz with

±5V supplies (2VP-P into 500Ω). Great part for

fast AC applications with

±5V supplies.

Input Filtering

The noise and the distortion of the input amplifier and

other circuitry must be considered since they will add to

the LTC1417 noise and distortion. The small-signal band-

width of the sample-and-hold circuit is 10MHz. Any noise

or distortion products that are present at the analog inputs

will be summed over this entire bandwidth. Noisy input

circuitry should be filtered prior to the analog inputs to

minimize noise. A simple 1-pole RC filter is sufficient for

many applications. For example, Figure 8 shows a 1000pF

APPLICATIONS INFORMATION

LinearView is a trademark of Linear Technology Corporation.

Figure 7. tACQ vs Source Resistance

SOURCE RESISTANCE (

Ω)

0.1

100

10k

1417 F07

0.01

100

100k

Choosing an Input Amplifier

Choosing an input amplifier is easy if a few requirements

are taken into consideration. First, choose an amplifier that

has a low output impedance (<100

Ω) at the closed-loop

bandwidth frequency. For example, if an amplifier is used

in a gain of 1 and has a closed-loop bandwidth of 10MHz,

then the output impedance at 10MHz must be less than

100

Ω. The second requirement is that the closed-loop

bandwidth must be greater than 10MHz to ensure ad-

equate small-signal settling for full throughput rate. If

slower op amps are used, more settling time can be

provided by increasing the time between conversions.

The best choice for an op amp to drive the LTC1417 will

depend on the application. Generally, applications fall into

two categories: AC applications where dynamic specifica-

tions are most critical and time domain applications where

DC accuracy and settling time are most critical. The

following list is a summary of the op amps that are suitable

for driving the LTC1417. More detailed information is

available in the Linear Technology Databooks and on the

LinearView

TM CD-ROM.

®1354: 12MHz, 400V/

µs Op Amp. 1.25mA maximum

supply current. Good AC and DC specifications. Suitable

for dual supply application.

LT1357: 25MHz, 600V/

µs Op Amp. 2.5mA maximum

supply current. Good AC and DC specifications. Suitable

for dual supply application.

Figure 8. RC Input Filter

LTC1417

AIN

–

VREF

REFCOMP

AGND

ANALOG INPUT

100

Ω

1417 F08

1000pF

µF

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