LTC1408 datasheet(13/20 Pages) LINER

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LTC1408

1408fa

LTC1566-1: Low Noise 2.3MHz Continuous Time

Lowpass Filter.

®1630: Dual 30MHz Rail-to-Rail Voltage FB Amplifier.

2.7V to

±15V supplies. Very high AVOL, 500µV offset and

520ns settling to 0.5LSB for a 4V swing. THD and noise

are – 93dB to 40kHz and below 1LSB to 320kHz (AV = 1,

2VP-P into 1kΩ, VS = 5V), making the part excellent for AC

applications (to 1/3 Nyquist) where rail-to-rail perfor-

mance is desired. Quad version is available as LT1631.

LT1632: Dual 45MHz Rail-to-Rail Voltage FB Amplifier.

2.7V to

±15V supplies. Very high AVOL, 1.5mV offset and

400ns settling to 0.5LSB for a 4V swing. It is suitable for

applications with a single 5V supply. THD and noise are

– 93dB to 40kHz and below 1LSB to 800kHz (AV = 1,

2VP-P into 1kΩ, VS = 5V), making the part excellent for AC

applications where rail-to-rail performance is desired.

Quad version is available as LT1633.

LT1801: 80MHz GBWP, –75dBc at 500kHz, 2mA/ampli-

fier, 8.5nV/

√Hz.

LT1806/LT1807: 325MHz GBWP, –80dBc distortion at

5MHz, unity gain stable, rail-to-rail in and out,

10mA/amplifier, 3.5nV/

√Hz.

LT1810: 180MHz GBWP, –90dBc distortion at 5MHz,

unity gain stable, rail-to-rail in and out, 15mA/amplifier,

16nV/

√Hz.

LT1818/LT1819: 400MHz, 2500V/

µs, 9mA, Single/Dual

Voltage Mode Operational Amplifier.

LT6200: 165MHz GBWP, –85dBc distortion at 1MHz,

unity gain stable, rail-to-rail in and out, 15mA/amplifier,

0.95nV/

√Hz.

LT6203: 100MHz GBWP, –80dBc distortion at 1MHz,

unity gain stable, rail-to-rail in and out, 3mA/amplifier,

1.9nV/

√Hz.

LT6600: Amplifier/Filter Differential In/Out with 10MHz

Cutoff.

CHOOSING AN INPUT AMPLIFIER

Choosing an input amplifier is easy if a few requirements

are taken into consideration. First, to limit the magnitude

of the voltage spike seen by the amplifier from charging

the sampling capacitor, 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 unity-gain bandwidth of 50MHz, then the

output impedance at 50MHz must be less than 100

Ω. The

second requirement is that the closed-loop bandwidth

must be greater than 40MHz to ensure adequate small-

signal settling for full throughput rate. If slower op amps

are used, more time for settling can be provided by

increasing the time between conversions. The best choice

for an op amp to drive the LTC1408 depends on the

application. Generally, applications fall into two catego-

ries: AC applications where dynamic specifications 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 LTC1408. (More detailed information is avail-

able in the Linear Technology Databooks and on the

website at www.linear.com.)

APPLICATIO S I FOR ATIO

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