LTC1411 datasheet(4/16 Pages) LINER

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LTC1411

1411f

TI I G CHARACTERISTICS

range, otherwise specifications are TA = 25°C. (Notes 5) (See Figures 11a, 11b)

The q denotes specifications which apply over the full operating temperature

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

fSAMPLE(MAX)

Maximum Sampling Frequency

(Note 9)

2.5

MHz

tCONV

Conversion Time

250

350

tACQ

Acquisition Time

100

SLP

↑ to CONVST↓ Wake-Up Time

µF Bypass Capacitor at REFCOM2 Pin

210

NAP

↑to CONVST↓Wake-Up Time

250

CONVST Low Time

(Note 10)

CONVST to BUSY Delay

CL = 25pF

Data Ready After BUSY

↑

7ns

CONVST High Time

(Note 10)

Aperture Delay of Sample-and-Hold

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: All voltage values are with respect to ground with DGND, OGND,

AVM and AGND wired together unless otherwise noted.

Note 3: When these pin voltages are taken below AGND or above VDD,

they will be clamped by internal diodes. This product can handle input

currents greater than 100mA without latchup.

Note 4: When these pin voltages are taken below AGND, they will be

clamped by internal diodes. This product can handle input currents greater

than 100mA below AGND without latchup. These pins are not clamped to

VDD.

Note 5: VDD = 5V, PGA1 = PGA0 = 5V, fSAMPLE = 2.5MHz at 25°C and

tr = tf = 5ns unless otherwise specified.

Note 6: Linearity, offset and full-scale specifications apply for a single-

ended AIN+ input with AIN– tied to an external 2.5V reference voltage.

Note 7: Integral nonlinearity is defined as the deviation of a code from a

straight line passing through the actual endpoints of the transfer curve.

The deviation is measured from the center of the quantization band.

Note 8: Bipolar offset is the offset voltage measured from – 0.5LSB

when the output code flickers between 0000 0000 0000 00 and

1111 1111 1111 11.

Note 9: Recommended operating conditions.

Note 10: The falling CONVST edge starts a conversion. If CONVST returns

high at a critical point during the conversion it can create small errors. For

best performance ensure that CONVST returns high within 20ns after

conversion start of after BUSY rises.

Note 11: SLP and NAP have an internal pull-down so the pins will draw

approximately 7

µA when tied high and less than 1µA when tied low.

TYPICAL PERFOR A CE CHARACTERISTICS

Signal-to-Noise Ratio

vs Input Frequency

INPUT FREQUENCY (kHz)

100

1000

10000

1411 G01

INPUT FREQUENCY (kHz)

100

1000

10000

1411 G02

INPUT FREQUENCY (kHz)

–80

–60

–40

100

1000

10000

1411 G03

–100

–110

–20

–90

–70

–50

–10

–30

2ND

3RD

THD

S/(N + D) vs Input Frequency

Distortion vs Input Frequency

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