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AD6644 Datasheet(PDF) 5 Page - Analog Devices

No. de pieza AD6644
Descripción Electrónicos  Analog-to-Digital Converter
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD6644 Datasheet(HTML) 5 Page - Analog Devices

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AD6644
Rev. D | Page 4 of 24
DIGITAL SPECIFICATIONS
AVCC = 5 V, DVCC = 3.3 V; TMIN = −25°C, TMAX = +85°C, unless otherwise noted.
Table 2.
AD6644AST-40
AD6644AST-65
Parameter
Temp
Test Level1
Min
Typ
Max
Min
Typ
Max
Unit
ENCODE INPUTS (ENCODE, ENCODE)
Differential Input Voltage2
Full
IV
0.4
0.4
V p-p
Differential Input Resistance
25°C
V
10
10
Differential Input Capacitance
25°C
V
2.5
2.5
pF
LOGIC OUTPUTS (D13 to D0, DRY, OVR)
Logic Compatibility
CMOS
CMOS
Logic 1 Voltage3
Full
V
2.5
2.5
V
Logic 0 Voltage3
Full
V
0.4
0.4
V
Output Coding
Twos complement
Twos complement
DMID
Full
V
DVCC/2
DVCC/2
V
1 See the Explanation of Test Levels section.
2 All ac specifications tested by driving ENCODE and ENCODE differentially. Reference Figure 18 for performance vs. encode power.
3 Digital output logic levels: DVCC = 3.3 V, CLOAD = 10 pF. Capacitive loads >10 pF degrade performance.
SWITCHING SPECIFICATIONS
AVCC = 5 V, DVCC = 3.3 V; ENCODE and ENCODE = maximum conversion rate MSPS; TMIN = –25°C, TMAX = +85°C, unless otherwise noted.
Table 3.
AD6644AST-40
AD6644AST-65
Parameter
Temp
Test Level1
Min
Typ
Max
Min
Typ
Max
Unit
Maximum Conversion Rate
Full
II
40
65
MSPS
Minimum Conversion Rate
Full
IV
15
15
MSPS
ENCODE Pulse Width High
Full
IV
10
6.5
ns
ENCODE Pulse Width Low
Full
IV
10
6.5
ns
1 See the Explanation of Test Levels section.
AVCC = 5 V, DVCC = 3.3 V; ENCODE and ENCODE = maximum conversion rate MSPS; TMIN = −25°C, TMAX = +85°C, CLOAD = 10 Pf,
unless otherwise noted.
Table 4.
AD6644AST-40/65
Parameter
Name
Temp
Test Level1
Min
Typ
Max
Unit
ENCODE INPUT PARAMETERS2
Encode Period @ 65 MSPS
tENC
Full
V
15.4
ns
Encode Period @ 40 MSPS
tENC
Full
V
25
ns
Encode Pulse Width High3 @ 65 MSPS
tENCH
Full
IV
6.2
7.7
9.2
ns
Encode Pulse Width Low @ 65 MSPS
tENCL
Full
IV
6.2
7.7
9.2
ns
ENCODE/DATA READY
Encode Rising to Data Ready Falling
tDR
Full
IV
2.6
3.4
4.6
ns
Encode Rising to Data Ready Rising
tE_DR
tENCH + tDR
@ 65 MSPS (50% Duty Cycle)
Full
IV
10.3
11.1
12.3
ns
@ 40 MSPS (50% Duty Cycle)
Full
IV
15.1
15.9
17.1
ns
ENCODE/DATA (D13:0), OVR
ENCODE to DATA Falling Low
tE_FL
Full
IV
3.8
5.5
9.2
ns
ENCODE to DATA Rising Low
tE_RL
Full
IV
3.0
4.3
6.4
ns
ENCODE to DATA Delay (Hold Time)4
tH_E
Full
IV
3.0
4.3
6.4
ns
ENCODE to DATA Delay (Setup Time)5
tS_E
tENC − tE_FL
Encode = 65 MSPS (50% Duty Cycle)
Full
IV
6.2
9.8
11.6
ns
Encode = 40 MSPS (50% Duty Cycle)
Full
IV
15.9
19.4
21.2
ns


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