LTC1850CFW datasheet(6/28 Pages) LINER

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LTC1850/LTC1851

18501f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

t17

WR High Time

(Note 10)

t18

M1 to M0 Setup Time

(Notes 9, 10)

t19

M0 to BUSY Delay

M1 High

t20

M0 to WR (or RD) Setup Time

(Notes 9, 10)

t19

t21

M0 High Pulse Width

(Note 10)

t22

RD High Time Between Readback Reads

(Note 10)

t23

Last WR (or RD) to M0

(Note 10)

t24

M0 to RD Setup Time

(Notes 9, 10)

t19

t25

M0 to CONVST

(Note 10)

t19

t26

Aperture Delay

– 0.5

t27

Aperture Jitter

2psRMS

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 GND, OGND and

GND wired together unless otherwise noted.

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

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

currents of 100mA below ground or above VDD without latchup.

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

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

100mA below ground without latchup. These pins are not clamped to VDD.

Note 5: VDD = 4.75V to 5.25V, fSAMPLE = 1.25MHz, tr = tf = 2ns unless

otherwise specified.

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

ended input on any channel with COM grounded.

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

straight line passing through the actual end points 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 0111 1111 1111 and 1000 0000 0000 for

LTC1851 and between 01 1111 1111 and 10 0000 0000 for LTC1850.

Note 9: Guaranteed by design, not subject to test.

Note 10: Recommended operating conditions.

Note 11: The falling CONVST edge starts a conversion. If CONVST returns

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

the best results, ensure that CONVST returns high either within 400ns

after the start of the conversion or after BUSY rises.

Note 12: The analog input range is determined by the voltage on

REFCOMP. The gain error specification is tested with an external 4.096V

but is valid for any value of REFCOMP.

The q denotes the specifications which apply over the full operating temperature

range, otherwise specifications are at TA = 25°C. (Note 5)

TI I G CHARACTERISTICS

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