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REF5045 Datasheet(PDF) 10 Page - Texas Instruments

Part # REF5045
Description  ADS8881x 18-Bit, 1-MSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter
PDF  62 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

REF5045 Datasheet(HTML) 10 Page - Texas Instruments

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D17
D16
D1
D0
1
2
17
18
D2
D15
16
DOUT
SCLK
CONVST
3
1/fsample
tACQ
tconv-max
twh-CNV-min
td-CNV-DO
th-CK-DO
td-CK-DO
tSCLK
tclkl
tclkh
td-CK-DOhz
DIN = HIGH
tquiet
10
ADS8881
SBAS547D – MAY 2013 – REVISED AUGUST 2015
www.ti.com
Product Folder Links: ADS8881
Submit Documentation Feedback
Copyright © 2013–2015, Texas Instruments Incorporated
8.6 Timing Requirements: 3-Wire Operation
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
ns
tconv
Conversion time
TA in the range –40°C to 85°C
500
710
ns
TA in the range 0°C to 70°C
500
700
tconv
Conversion time
500
ns
1/fsample
Time between conversions
1000
ns
twh-CNV
Pulse duration: CONVST high
10
ns
fSCLK
SCLK frequency
70
MHz
tSCLK
SCLK period
14.3
ns
tclkl
SCLK low time
0.45
0.55 tSCLK
tclkh
SCLK high time
0.45
0.55 tSCLK
th-CK-DO
SCLK falling edge to current data invalid
3
ns
td-CK-DO
SCLK falling edge to next data valid delay
TA in the range –40°C to 85°C
13.4
ns
TA in the range 0°C to 70°C
11.7
TA in the range 25°C to 50°C
10.7
td-CNV-DO
Enable time: CONVST low to MSB valid
12.3
ns
td-CNV-DOhz
Disable time: CONVST high or last SCLK falling edge to DOUT 3-state (CS mode)
13.2
ns
tquiet
Quiet time
TA in the range –40°C to 85°C
20
ns
TA in the range 0°C to 70°C
13
Figure 1. 3-Wire Operation: CONVST Functions as Chip Select
NOTE: Figure 1 shows the timing diagram for the 3-Wire CS Mode Without a Busy Indicator interface option.
However, the timing parameters specified in Timing Requirements: 3-Wire Operation are also applicable for the
3-Wire CS 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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