Datasheet

Table Of Contents

LTC1272

1272fc

For more information www.linear.com/1272

ELECTRICAL CHARACTERISTICS

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 DGND and

AGND wired together, unless otherwise noted.

Note 3: When the analog input voltage is taken below ground it will be

clamped by an internal diode. This product can handle, with no external

diode, input currents of greater than 60mA below ground without latch-up.

Note 4:

= 5V, f

CLK

= 4MHz for LTC1272-3, and 1.6MHz for

LTC1272-8, t

= t

= 5ns unless otherwise speciﬁed. For best analog

performance, the LTC1272 clock should be synchronized to the RD and

CS control inputs with at least 40ns separating convert start from the

nearest clock edge.

Note 5: Linearity error is speciﬁed between the actual end points of the

A/D transfer curve.

Note 6: The LTC1272 has the same 0V to 5V input range as the AD7572

but, to achieve single supply operation, it provides a 2.42V reference

output instead of the –5.25V of the AD7572. This requires that the polarity

of the reference bypass capacitor be reversed when plugging an LTC1272

into an AD7572 socket.

Note 7: Guaranteed by design, not subject to test.

Note 8: V

= 5V. Timing speciﬁcations are sample tested at 25°C to

ensure compliance. All input control signals are speciﬁed with t

= t

= 5ns

(10% to 90% of 5V) and timed from a voltage level of 1.6V. See Figures 13

through 17.