ADS8864_14 datasheet(6/46 Pages) TI1

Part #	ADS8864

Description	16-Bit, 400-kSPS, Serial Interface, microPower, Miniature, Single-Ended Input, SAR Analog-to-Digital Converter

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D15

D14

D1

D0

1

2

15

16

D2

D13

14

DOUT

SCLK

DIN

3

CONVST

1/fsample

tACQ

tconv-max

td-DI-DO

twl-CNV

tsu-DI-CNV

td-DI-DOhz

twh-DI-min

ADS8864

SBAS572A – MAY 2013 – REVISED DECEMBER 2013

www.ti.com

4-WIRE OPERATION

Figure 2. 4-Wire Operation: DIN Functions as Chip Select

NOTE

Figure 2 shows the timing diagram for the 4-Wire CS Mode Without a Busy Indicator

interface option. However, the timing parameters specified in Table 2 are also applicable

for the 4-Wire CS Mode With a Busy Indicator interface option, unless otherwise specified.

Refer to the Digital Interface section for specific details for each interface option.

Table 2. TIMING REQUIREMENTS: 4-Wire Operation(1)

PARAMETER

MIN

TYP

MAX

UNIT

tACQ

Acquisition time

1200

ns

tconv

Conversion time

500

1300

ns

1/fsample

Time between conversions

2500

ns

twh-DI

Pulse duration: DIN high

10

ns

twl-CNV

Pulse width: CONVST low

20

ns

td-DI-DO

Delay time: DIN low to MSB valid

12.3

ns

td-DI-DOhz

Delay time: DIN high or last SCLK falling edge to DOUT 3-state

13.2

ns

tsu-DI-CNV

Setup time: DIN high to CONVST rising edge

7.5

ns

th-DI-CNV

Hold time: DIN high from CONVST rising edge (see Figure 61)

0

ns

(1)

All specifications are at TA = –40°C to +85°C, AVDD = 3 V, and DVDD = 3 V, unless otherwise noted.

6

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