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ADS7881IPFBR Datasheet(PDF) 5 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
No. de pieza ADS7881IPFBR
Descripción Electrónicos  12-BIT, 4-MSPS LOW POWER SAR ANALOG-TO-DIGITAL CONVERTER
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Fabricante Electrónico  BURR-BROWN [Burr-Brown (TI)]
Página de inicio  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

ADS7881IPFBR Datasheet(HTML) 5 Page - Burr-Brown (TI)

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ADS7881
SLAS400B − SEPTEMBER 2003 − REVISED NOVEMBER 2005
www.ti.com
5
TIMING REQUIREMENTS
All specifications typical at −40
°C to 85°C, +VA = +5 V, +VBD = +5 V (see Notes 1, 2, 3, and 4)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
REF FIG.
Conversion time
t(conv)
185
200
ns
5
Acquisition time
t(acq)
50
65
ns
5
SAMPLING AND CONVERSION START
Hold time CS low to CONVST high (with BUSY high)
th1
10
ns
3
Delay CONVST high to acquisition start
td1
2
4
5
ns
1
Hold time, CONVST high to CS high with BUSY low
th2
10
ns
1
Hold time, CONVST low to CS high
th3
10
ns
1
Delay CONVST low to BUSY high
td2
40
ns
1
CS width for acquisition or conversion to start
tw3
20
ns
2
Delay CS low to acquisition start with CONVST high
td3
2
4
5
ns
2
Pulse width, from CS low to CONVST low for acquisition to start
tw1
20
ns
2
Delay CS low to BUSY high with CONVST low
td4
40
ns
2
Quiet sampling time(3)
25
ns
CONVERSION ABORT
Setup time CONVST high to CS low with BUSY high
ts1
15
ns
4
Delay time CS low to BUSY low with CONVST high
td5
20
ns
4
DATA READ
Delay RD low to data valid with CS low
td6
25
ns
5
Delay BYTE high to LSB word valid with CS and RD low
td7
25
ns
5
Delay time RD high to data 3-state with CS low
td9
25
ns
5
Delay time end of conversion to BUSY low
td11
20
ns
5
Quiet sampling time RD high to CONVST low
t1
25
ns
5
Delay CS low to data valid with RD low
td8
25
ns
6
Delay CS high to data 3-state with RD low
td10
25
ns
6
Quiet sampling time CS low to CONVST low
t2
25
ns
6
BACK-TO-BACK CONVERSION
Delay BUSY low to data valid
td12
10
ns
7, 8
Pulse width, CONVST high
tw4
60
ns
7, 8
Pulse width, CONVST low
tw5
20
ns
7
POWER DOWN/RESET
Pulse width, low for PWD/RST to reset the device
tw6
45
6140
ns
10
Pulse width, low for PWD/RST to power down the device
tw7
7200
ns
9
Delay time, power up after PWD/RST is high
td13
25
ms
9
(1) All input signals are specified with tr = tf = 5 ns (10% to 90% of +VBD) and timed from a voltage level of (VIL + VIH)/2.
(2) See timing diagram.
(3) Quiet period before conversion start, no data bus activity including data bus 3-state is allowed in this period.
(4) All timings are measured with 20 pF equivalent loads on all data bits and BUSY pin.


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