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ADS7868IDBVRG4 Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza ADS7868IDBVRG4
Descripción Electrónicos  1.2-V, 12-/10-/8-BIT, 200-KSPS/100-KSPS, MICRO-POWER, MINIATURE ANALOG-TO-DIGITAL CONVERTER WITH SERIAL INTERFACE
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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ADS7868IDBVRG4 Datasheet(HTML) 9 Page - Texas Instruments

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TIMING REQUIREMENTS
(1) (2)
1
2
3
5
4
6
10
16
14
12
1
9
SCLK
SDO
Hi−Z
Auto Power− Down
7
8
Last SCLK= 16 for ADS 7866
14for ADS 7867
12for ADS 7868
Hi−Z
Auto Power−Down
2
tSU(CSF−FSCLKF)
tC(SCLK)
tWH(SCLK)
tWL(SCLK)
tWH(CS)
tSU(LSBZ−CSF)
tDIS(EOC−SDOZ)
tSU(CSF−FSCLKF)
tD(CSF−SDOVALID)
“0”
“0”
“0”
tCONVERT
“0” “0”
“0”
tH(SCLKF−SDOVALID)
tD(SCLKF−SDOVALID)
tD(CSF−SDOVALID)
tSAMPLE
“0”
HOLD
EOC
CS
tCYCLE
MSB
MSB−1 MSB−2 MSB−3 MSB−4 MSB−5
LSB
ADS7866
ADS7867
ADS7868
SLAS465 – JUNE 2005
At –40°C to 85°C, f
SCLK = 3.4 MHz if 1.6 V ≤ VDD ≤ 3.6 V; fSCLK = 1.7 MHz if 1.2 V ≤ VDD < 1.6 V, 50-pF Load on SDO Pin,
unless otherwise noted
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tsample
Sample time
tSU(CSF-FSCLKF) + 2 × tC(SCLK)
µs
ADS7866
13
× t
C(SCLK)
tconvert
Conversion time
ADS7867
11
× t
C(SCLK)
µs
ADS7868
9
× t
C(SCLK)
1.2 V
≤ V
DD < 1.6 V
See (3)
100
1.6 V
≤ V
DD < 1.8 V
See (3)
100
tC(SCLK)
Cycle time
µs
1.8 V
≤ V
DD < 2.5 V
See (3)
50
2.5 V
≤ V
DD ≤ 3.6 V
See (3)
6.7
tWH(SCLK)
Pulse duration
0.4
× t
C(SCLK)
0.6
× t
C(SCLK)
ns
tWL(SCLK)
Pulse duration
0.4
× t
C(SCLK)
0.6
× t
C(SCLK)
ns
1.2 V
≤ V
DD < 1.6 V
192
tSU(CSF-FSCLKF)
Setup time
1.6 V
≤ V
DD < 1.8 V
55
ns
1.8 V
≤ V
DD ≤ 3.6 V
55
1.2 V
≤ V
DD < 1.6 V
65
tD(CSF-SDOVALID)
Delay time
1.6 V
≤ V
DD < 1.8 V
55
ns
1.8 V
≤ V
DD ≤ 3.6 V
55
1.2 V
≤ V
DD < 1.6 V
20
tH(SCLKF-SDOVALID)
Hold time
1.6 V
≤ V
DD < 1.8 V
10
ns
1.8 V
≤ V
DD ≤ 3.6 V
10
1.2 V
≤ V
DD < 1.6 V
140
tD(SCLKF-SDOVALID)
Delay time
1.6 V
≤ V
DD < 1.8 V
140
ns
1.8 V
≤ V
DD ≤ 3.6 V
140
1.2 V
≤ V
DD < 1.6 V
10
80
tDIS(EOC-SDOZ)
Disable time
1.6 V
≤ V
DD < 1.8 V
7
60
ns
1.8 V
≤ V
DD ≤ 3.6 V
7
60
1.2 V
≤ V
DD < 1.6 V
20
tWH(CS)
Pulse duration
1.6 V
≤ V
DD < 1.8 V
10
ns
1.8 V
≤ V
DD ≤ 3.6 V
10
1.2 V
≤ V
DD < 1.6 V
20
tSU(LSBZ-CSF)
Setup time
1.6 V
≤ V
DD < 1.8 V
10
ns
1.8 V
≤ V
DD ≤ 3.6 V
10
(1)
All input signals are specified with tr = tf = 5 ns (10% to 90% of VDD) and timed from a voltage level of (VIL + VIH)/2.
(2)
See timing diagram in Figure 1.
(3)
Min tC(SCLK) is determined by the Min tSAMPLE of the specific resolution and supply voltage. See Acquisition Time, Conversion Time, and
Total Cycle Time section for further details.
Figure 1. Timing Diagram
9


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