ADS8864_14 Datasheet, PDF (7/46 Pages) Texas Instruments – 16-Bit, 400-kSPS, Serial Interface, microPower, Miniature, Single-Ended Input, SAR Analog-to-Digital Converter

ADS8864
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DAISY-CHAIN OPERATION
SBAS572A – MAY 2013 – REVISED DECEMBER 2013
t_conv-
max
1/f_sample
t_ACQ
CONVST
SCLK
t_h-CK-CNV
1
2
15
16 17 18
DIN 1 = LOW ^tsu-CK-CNV
t_su-DI-CK
31 32
DOUT 1,
DIN 2
D15 D14
D1 D0
DOUT 2
D15 D15
D1
D0 D15 D14
D1 D0
Device 2 Data
Device 1 Data
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 Table 3 are also applicable
for the Daisy-Chain Mode With a Busy Indicator interface option, unless otherwise
specified. Refer to the Digital Interface section for specific details for each interface option.
Table 3. TIMING REQUIREMENTS: Daisy-Chain⁽¹⁾
t_ACQ
t_conv
1/f_sample
t_su-CK-CNV
t_h-CK-CNV
t_su-DI-CNV
t_h-DI-CNV
t_su-DI-CK
PARAMETER
Acquisition time
Conversion time
Time between conversions
Setup time: SCLK valid to CONVST rising edge
Hold time: SCLK valid from CONVST rising edge
Setup time: DIN low to CONVST rising edge (see )
Hold time: DIN low from CONVST rising edge (see Figure 61)
Setup time: DIN valid to SCLK falling edge
MIN
1200
500
2500
5
5
7.5
0
1.5
(1) All specifications are at T_A = –40°C to +85°C, AVDD = 3 V, and DVDD = 3 V, unless otherwise noted.
TYP MAX UNIT
ns
1300 ns
ns
ns
ns
ns
ns
ns
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