Data Sheet

LTC2686

SPECIFICATIONS

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Rev. A | 7 of 45

TIMING CHARACTERISTICS

All specifications apply over the full operating temperature range, unless otherwise noted. Typical values are at TA = 25°C. VCC = 4.75 V to 5.25

V, IOVCC = 1.71 V to VCC. CLOAD is load capacitance. IOVCC = 2.7 V to VCC, unless otherwise noted. See Figure 2.

Table 2.

Parameter

Description

Min

Typ

Max

Unit

t1

SDI valid to SCK setup

3

ns

t2

SDI valid to SCK hold

3

ns

t3

SCK high time

6

ns

t4

SCK low time

6

ns

t5

CS/LD pulse width

8

ns

t6

LSB SCK high to CS/LD high

5

ns

t7

CS/LD low to SCK high

5

ns

t8

SDO propagation delay from SCK falling edge, CLOAD = 10 pF, IOVCC = 2.7 V to 5.25 V

25

ns

SDO propagation delay from SCK falling edge, CLOAD = 10 pF, IOVCC = 1.7 1 V to 2.7 V

60

ns

t9

CLR pulse width

8

ns

t10

CS/LD high to SCK positive edge

4

ns

t11

LDAC pulse width

8

ns

t12

CS/LD high to LDAC high or low transition1

8

ns

fSCK

SCK frequency

50

MHz

t13

TGPx high time

0.25

μs

t14

TGPx low time2

0.25

μs

1 Value of t12 is not valid for write code to all DAC channels. For write code to all DAC channels, the typical value of t12 is 320 ns.

2 Guaranteed by design but not production tested.

Timing Diagram

Figure 2. Serial Interface Timing Diagram