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ADS8505IDBRG4 Datasheet(PDF) 11 Page - Texas Instruments

Part # ADS8505IDBRG4
Description  16-BIT 250-KSPS SAMPLING CMOS ANALOG-TO-DIGITAL CONVERTER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS8505IDBRG4 Datasheet(HTML) 11 Page - Texas Instruments

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Bit 0 (LSB)
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 15 (MSB)
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
6
7
8
9
10
11
12
13
14
23
22
21
20
19
18
17
16
15
ADS8505
BYTE LOW
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12
Bit 13
Bit 14
Bit 15 (MSB)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0 (LSB)
6
7
8
9
10
11
12
13
14
23
22
21
20
19
18
17
16
15
ADS8505
BYTE HIGH
+5 V
ADS8505
SLAS180B – SEPTEMBER 2005 – REVISED JUNE 2007
The number of control lines can be reduced by tying CS low while using the falling edge of R/C to initiate
conversions and the rising edge of R/C to activate the output mode of the converter. See Figure 23.
Table 3. Conversion Timing
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
tw1
Pulse duration, convert
40
1750
ns
ta
Access time, data valid after R/C low
2.2
3.2
µs
tpd
Propagation delay time, BUSY from R/C low
15
25
ns
tw2
Pulse duration, BUSY low
2.2
µs
td1
Delay time, BUSY after end of conversion
5
ns
td2
Delay time, aperture
5
ns
tconv
Conversion time
2.2
µs
tacq
Acquisition time
1.8
µs
tdis
Disable time, bus
10
30
83
ns
td3
Delay time, BUSY after data valid
35
50
ns
tv
Valid time, previous data remains valid after R/C low
1.5
2
µs
tconv + tacq
Throughput time
4
µs
tsu
Setup time, R/C to CS
10
ns
tc
Cycle time between conversions
4
µs
ten
Enable time, bus
10
30
83
ns
td4
Delay time, BYTE
5
10
30
ns
Figure 22. Bit Locations Relative to State of BYTE (Pin 23)
11
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