LTC1852/LTC1853

6

18523fa

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: All voltage values are with respect to ground with OGND and GND

wired together unless otherwise noted.

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

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

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

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 1111 1111 1111 and 0000 0000 0000.

For the LTC1853 and between 11 1111 1111 and 00 0000 0000 for the

LTC1852.

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 greater than 2V and less than

Note 13: MUX address is updated immediately after BUSY falls.

1.0

0.5

0

–0.5

–1.0

0

4096

CODE

1852 F02

0

–20

–40

–60

–80

–100

–120

0

200

FREQUENCY (kHz)

1852 F03

Differential Linearity

8192 Point FFT with

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

CONVST High Time

(Note 10)

●

50

ns

Latch Setup Time

(Note 10)

●

10

ns

Latch Hold Time

(Notes 9, 10)

●

10

ns

WR Low Time

(Note 10)

●

50

ns

WR High Time

(Note 10)

●

50

ns

M1 to M0 Setup Time

(Notes 9, 10)

●

10

ns

M0 to BUSY Delay

M1 High

20

ns

M0 to WR (or RD) Setup Time

(Notes 9, 10)

●

ns

M0 High Pulse Width

(Note 10)

●

50

ns

RD High Time Between Readback Reads

(Note 10)

●

50

ns

Last WR (or RD) to M0

(Note 10)

●

10

ns

M0 to RD Setup Time

(Notes 9, 10)

●

ns

M0 to CONVST

(Note 10)

●

ns

Aperture Delay

– 0.5

ns

Aperture Jitter

TYPICAL PERFORMANCE CHARACTERISTICS