LTC6945 datasheet(6/24 Pages) LINER

6 / 24 page

LTC2271

2271f

TIMING CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature

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

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Sampling Frequency

(Note 10)

MHz

tENCL

ENC Low Time (Note 8) Duty Cycle Stabilizer Off

Duty Cycle Stabilizer On

23.5

100

tENCH

ENC High Time (Note 8) Duty Cycle Stabilizer Off

Duty Cycle Stabilizer On

23.5

100

tAP

Sample-and-Hold

Acquistion Delay Time

0ns

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 GND with GND and OGND

shorted (unless otherwise noted).

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

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

of greater than 100mA below GND or above VDD without latchup.

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

clamped by internal diodes. When these pin voltages are taken above VDD

they will not be clamped by internal diodes. This product can handle input

currents of greater than 100mA below GND without latchup.

Note 5: VDD = OVDD = 1.8V, fSAMPLE = 20MHz, 2-lane output mode,

differential ENC+/ENC– = 2VP-P sine wave, input range = 2.1VP-P with

differential drive, unless otherwise noted.

Note 6: Integral nonlinearity is deﬁned as the deviation of a code from a

best ﬁt straight line to the transfer curve. The deviation is measured from

the center of the quantization band.

Note 7: Offset error is the offset voltage measured from –0.5LSB when the

output code ﬂickers between 0000 0000 0000 0000 and 1111 1111 1111

1111 in 2’s complement output mode.

Note 8: Guaranteed by design, not subject to test.

Note 9: VDD = OVDD=1.8V, fSAMPLE = 20MHz, 2-lane output mode, ENC+

= single-ended 1.8V square wave, ENC– = 0V, input range = 2.1VP-P with

differential drive, unless otherwise noted. The supply current and power

dissipation speciﬁcations are totals for the entire IC, not per channel.

Note 10: Recommended operating conditions.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Digital Data Outputs (RTERM = 100Ω Differential, CL = 2pF to GND On Each Output)

tSER

Serial Data Bit Period

4-Lane Output Mode

2-Lane Output Mode

1-Lane Output Mode

1/(4 • fS)

1/(8 • fS)

1/(16 • fS)

Sec

tFRAME

FR to DCO Delay

(Note 8)

0.35 • tSER

0.5 • tSER

0.65 • tSER

Sec

tDATA

Data to DCO Delay

(Note 8)

0.35 • tSER

0.5 • tSER

0.65 • tSER

Sec

tPD

Propagation Delay

(Note 8)

l 0.7n + 2 • tSER 1.1n + 2 • tSER 1.5n + 2 • tSER

Sec

Output Rise Time

Data, DCO, FR, 20% to 80%

0.17

Output Fall Time

Data, DCO, FR, 20% to 80%

0.17

DCO Cycle-Cycle Jitter

tSER = 3.1ns

psP-P

Pipeline Latency

Cycles

SPI Port Timing (Note 8)

tSCK

SCK Period

Write Mode

Readback Mode,

CSDO = 20pF, RPULLUP = 2k

250

CS-to-SCK Setup Time

5ns

SCK-to-CS Setup Time

5ns

tDS

SDI Setup Time

5ns

tDH

SDI Hold Time

5ns

tDO

SCK Falling to SDO

Valid

Readback Mode,

CSDO = 20pF, RPULLUP = 2k

125

LTC6945 датащи(PDF) 6 Page - Linear Technology

LTC6945 датащи(HTML) 6 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

датащи скачать

ссылки URL