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AD9238 数据表(PDF) 7 Page - Analog Devices

部件名 AD9238
功能描述  Dual A/D Converter
Download  49 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD9238 数据表(HTML) 7 Page - Analog Devices

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AD9238
Rev. C | Page 6 of 48
DIGITAL SPECIFICATIONS
AVDD = 3 V, DRVDD = 2.5 V, maximum sample rate, CLK_A = CLK_B; AIN = −0.5 dBFS differential input, 1.0 V internal reference,
TMIN to TMAX, DCS enabled, unless otherwise noted.
Table 3.
Test
AD9238BST/BCP-20
AD9238BST/BCP-40
AD9238BST/BCP-65
Parameter
Temp
Level
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Unit
LOGIC INPUTS
High Level Input Voltage
Full
IV
2.0
2.0
2.0
V
Low Level Input Voltage
Full
IV
0.8
0.8
0.8
V
High Level Input Current
Full
IV
−10
+10
−10
+10
−10
+10
μA
Low Level Input Current
Full
IV
−10
+10
−10
+10
−10
+10
μA
Input Capacitance
Full
IV
2
2
2
pF
LOGIC OUTPUTS1
High Level Output Voltage
Full
IV
DRVDD −
0.05
DRVDD −
0.05
DRVDD −
0.05
V
Low Level Output Voltage
Full
IV
0.05
0.05
0.05
V
1 Output voltage levels measured with capacitive load only on each output.
SWITCHING SPECIFICATIONS
AVDD = 3 V, DRVDD = 2.5 V, maximum sample rate, CLK_A = CLK_B; AIN = −0.5 dBFS differential input, 1.0 V internal reference,
TMIN to TMAX, DCS enabled, unless otherwise noted.
Table 4.
Test
AD9238BST/BCP-20
AD9238BST/BCP-40
AD9238BST/BCP-65
Parameter
Temp
Level
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Unit
SWITCHING PERFORMANCE
Maximum Conversion Rate
Full
VI
20
40
65
MSPS
Minimum Conversion Rate
Full
V
1
1
1
MSPS
CLK Period
Full
V
50.0
25.0
15.4
ns
CLK Pulse-Width High1
Full
V
15.0
8.8
6.2
ns
CLK Pulse-Width Low1
Full
V
15.0
8.8
6.2
ns
DATA OUTPUT PARAMETER
Output Delay2 (tPD)
Full
VI
2
3.5
6
2
3.5
6
2
3.5
6
ns
Pipeline Delay (Latency)
Full
V
7
7
7
Cycles
Aperture Delay (tA)
Full
V
1.0
1.0
1.0
ns
Aperture Uncertainty (tJ)
Full
V
0.5
0.5
0.5
ps rms
Wake-Up Time3
Full
V
2.5
2.5
2.5
ms
OUT-OF-RANGE RECOVERY TIME
Full
V
2
2
2
Cycles
1 The AD9238-65 model has a duty cycle stabilizer circuit that, when enabled, corrects for a wide range of duty cycles (see Figure 24).
2 Output delay is measured from clock 50% transition to data 50% transition, with a 5 pF load on each output.
3 Wake-up time is dependent on the value of the decoupling capacitors; typical values shown with 0.1 μF and 10 μF capacitors on REFT and REFB.
N–1
N
N+1
N+2
N+3
N+4
N+5
N+6
N+7
N+8
ANALOG
INPUT
CLOCK
DATA
OUT
N–9
N–8
N–7
N–6
N–5
N–4
N–3
N–2
N–1
N
MIN 2.0ns,
MAX 6.0ns
tPD =
Figure 2. Timing Diagram


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