LTC2668 datasheet(8/40 Pages) LINER

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LTC2348-16

234816fa

For more information www.linear.com/LTC2348-16

CMOS Timings

0.8 • OVDD

0.2 • OVDD

50%

234816 F01

0.2 • OVDD

0.8 • OVDD

0.2 • OVDD

0.8 • OVDD

tDELAY

tWIDTH

tDELAY

LVDS Timings (Differential)

+200mV

–200mV

234816 F01b

–200mV

+200mV

–200mV

+200mV

tDELAY

tWIDTH

tDELAY

Figure 1. Voltage Levels for Timing Specifications

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.

Note 3: VDDLBYP is the output of an internal voltage regulator, and should

only be connected to a 2.2μF ceramic capacitor to bypass the pin to GND,

as described in the Pin Functions section. Do not connect this pin to any

external circuitry.

Note 4: When these pin voltages are taken below VEE or above VCC, they

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

of up to 100mA below VEE or above VCC without latch-up.

Note 5: When these pin voltages are taken below ground or above VDD or

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

currents of up to 100mA below ground or above VDD or OVDD without

latch-up.

Note 6: –16.5V ≤ VEE ≤ 0V, 0V ≤ VCC ≤ 38V, 10V ≤ (VCC – VEE) ≤ 38V,

VDD = 5V, unless otherwise specified.

Note 7: Recommended operating conditions.

Note 8: Exceeding these limits on any channel may corrupt conversion

results on other channels. Refer to Absolute Maximum Ratings section for

pin voltage limits related to device reliability.

Note 9: VCC = 15V, VEE = –15V, VDD = 5V, OVDD = 2.5V, fSMPL = 200ksps,

internal reference and buffer, true bipolar input signal drive in bipolar

SoftSpan ranges, unipolar signal drive in unipolar SoftSpan ranges, unless

otherwise specified.

Note 10: 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 11: Guaranteed by design, not subject to test.

Note 12: For bipolar SoftSpan ranges 7, 6, 3, and 2, zero-scale error is

the offset voltage measured from –0.5LSB when the output code flickers

between 0000 0000 0000 0000 and 1111 1111 1111 1111. Full-scale

error for these SoftSpan ranges is the worst-case deviation of the first and

last code transitions from ideal and includes the effect of offset error. For

unipolar SoftSpan ranges 5, 4, and 1, zero-scale error is the offset voltage

measured from 0.5LSB when the output code flickers between 0000 0000

0000 0000 and 0000 0000 0000 0001. Full-scale error for these SoftSpan

ranges is the worst-case deviation of the last code transition from ideal

and includes the effect of offset error.

Note 13: All specifications in dB are referred to a full-scale input in the

relevant SoftSpan input range, except for crosstalk, which is referred to

the crosstalk injection signal amplitude.

Note 14: Temperature coefficient is calculated by dividing the maximum

change in output voltage by the specified temperature range.

Note 15: When REFBUF is overdriven, the internal reference buffer must

be disabled by setting REFIN = 0V.

Note 16: IREFBUF varies proportionally with sample rate and the number of

active channels.

Note 17: Parameter tested and guaranteed at OVDD = 1.71V, OVDD = 2.5V,

and OVDD = 5.25V.

Note 18: A tSCKI period of 10ns minimum allows a shift clock frequency of

up to 100MHz for rising edge capture.

Note 19: VICM = 1.2V, VID = 350mV for LVDS differential input pairs.

aDc TiMing characTerisTics

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