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ADS8504IBDWRG4 View Datasheet(PDF) - Burr-Brown -> Texas Instruments

Part NameDescriptionManufacturer
ADS8504IBDWRG4 12-BIT 250-KSPS SAMPLING CMOS ANALOG-TO-DIGITAL CONVERTER BB
Burr-Brown -> Texas Instruments BB
ADS8504IBDWRG4 Datasheet PDF : 19 Pages
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ADS8504
SLAS434 – JUNE 2005
DESCRIPTION
Full-scale range
Least significant bit (LSB)
Full scale (10 V-1 LSB)
Midscale
One LSB below midscale
-Full scale
www.ti.com
Table 2. Ideal Input Voltages and Output Codes
ANALOG INPUT
±10 V
4.88 mV
9.99512 V
0V
-4.88 mV
-10 V
DIGITAL OUTPUT BINARY 2's COMPLEMENT
BINARY CODE
HEX CODE
0111 1111 1111
7FF
0000 0000 0000
000
1111 1111 1111
FFF
1000 0000 0000
800
PARALLEL OUTPUT (After a Conversion)
After conversion n is completed and the output registers have been updated, BUSY (pin 26) goes high. Valid
data from conversion n is available on D11-D0 (pins 6-13 and 15-18). BUSY going high can be used to latch the
data. Refer to Table 3 and Figure 19, Figure 20, and Figure 21 for timing specifications.
PARALLEL OUTPUT (During a Conversion)
After conversion n has been initiated, valid data from conversion n-1 can be read and is valid up to t2 (2.2 µs typ)
after the start of conversion n. Do not attempt to read data from t2 (2.2 µs typ) after the start of conversion n until
BUSY (pin 26) goes high; this may result in reading invalid data. Refer to Table 3 and Figure 19, Figure 20, and
Figure 21 for timing specifications.
Note: For the best possible performance, data should not be read during a conversion. The switching noise of
the asynchronous data transfer can cause digital feedthrough degrading the converter's performance.
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 19.
Table 3. Conversion Timing
SYMBOL DESCRIPTION
MIN
tw1
Pulse duration, convert
40
ta
Access time, data valid after R/C low
tpd
Propagation delay time, BUSY from R/C low
tw2
Pulse duration, BUSY low
td1
Delay time, BUSY after end of conversion
td2
Delay time, aperture
tconv
Conversion time
tacq
Acquisition time
1.8
tdis
Disable time, bus
10
td3
Delay time, BUSY after data valid
35
tv
Valid time, previous data remains valid after R/C low
1.5
tconv + tacq Throughput time
tsu
Setup time, R/C to CS
10
tc
Cycle time between conversions
4
ten
Enable time, bus
10
td4
Delay time, BYTE
5
TYP
2.2
15
5
5
30
50
2
30
10
MAX
1750
3.2
25
2.2
2.2
83
4
83
30
UNITS
ns
µs
ns
µs
ns
ns
µs
µs
ns
ns
µs
µs
ns
µs
ns
ns
10
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