REF5045 datasheet(12/62 Pages) TI2

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CONVST

SCLK

DOUT 2

tsu-CK-CNV

D17

D16

D17

D16

DOUT 1,

DIN 2

D17

D16

1/fsample

tACQ

tconv-

max

th-CK-CNV

Device 2 Data

Device 1 Data

DIN 1 = LOW

tsu-DI-CK

ADS8881

SBAS547D – MAY 2013 – REVISED AUGUST 2015

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Product Folder Links: ADS8881

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8.8 Timing Requirements: Daisy-Chain

All specifications are at AVDD = 3 V, DVDD = 3 V, and over the operating free-air temperature range, unless otherwise noted.

MIN

TYP

MAX UNIT

tACQ

Acquisition time

290

tconv

Conversion time

TA in the range -40°C to 85°C

500

710

TA in the range 0°C to 70°C

500

700

tconv

Conversion time

500

1/fsample

Time between conversions

1000

tsu-CK-CNV

Setup time: SCLK valid to CONVST rising edge

th-CK-CNV

Hold time: SCLK valid from CONVST rising edge

tsu-DI-CNV

Setup time: DIN low to CONVST rising edge (see Figure 2)

7.5

th-DI-CNV

Hold time: DIN low from CONVST rising edge (see Figure 63)

tsu-DI-CK

Setup time: DIN valid to SCLK falling edge

1.5

Figure 3. Daisy-Chain Operation: Two Devices

NOTE: Figure 3 shows the timing diagram for the Daisy-Chain Mode Without a Busy Indicator interface option.

However, the timing parameters specified in Timing Requirements: Daisy-Chain are also applicable for the Daisy-

Chain Mode With a Busy Indicator interface option, unless otherwise specified; see the Device Functional Modes

section for specific details for each interface option.

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