ASD5020L640INT Arctic Silicon Devices, ASD5020L640INT Datasheet - Page 19

• Manufacturer Part Number: ASD5020L640INT
• Description: ADC (A/D Converters) Mul-Md 12bit/640MSPS 8-bit 1000 MSPS ADC
• Manufacturer: Arctic Silicon Devices

Specifications of ASD5020L640INT

• Number Of Converters: 1
• Number Of Adc Inputs: 2
• Conversion Rate: 640 MSPs
• Resolution: 12 bit
• Snr: 70 dB
• Voltage Reference: 1 V
• Supply Voltage (max): 2 V
• Supply Voltage (min): 1.7 V
• Maximum Power Dissipation: 490 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-48
• Input Voltage: 1.8 V
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Preliminary Product Specification
Start-up and Clock Jitter Control
To optimize start up time, a register is provided where the start-up time in number of clock cycles can be set. Some
internal circuitry have start up times that are clock frequency independent. Default counter values are set to
accommodate these start up times at the maximum clock frequency (sampling rate). This will lead to increased start up
times at low clock frequencies. Setting the value of this register to the nearest higher clock frequency will reduce the
count values of the internal counters, to better fit the actual start up time, such that the start up time will be reduced. The
start up times from power down and sleep modes are changed by this register setting. If the clock divider is used (set to
other than 1), the input clock frequency must be divided by the divider factor to find the correct clock frequency range
(see table 7).
ASD5020
startup_ctrl<2:0>
jitter_ctrl<7:0>
ctrl<2:0>
ctrl<2:0>
startup_
startup_
other
other
100
000
001
010
011
100
000
001
010
011
Name
Clock frequency
Clock frequency
Do not use
640 - 1000
Do not use
160 - 250
100 - 160
400 - 640
260 - 400
160 - 260
120 - 160
65 - 100
[MSPS]
[MSPS]
Controls start-up time.
Clock jitter adjustment.
40 - 65
30 - 40
range
range
Single channel
Quad channel
Description
[clock cycles]
[clock cycles]
Startup delay
Startup delay
12288
3072
1984
1280
7936
5120
3360
2080
840
520
-
-
Table 12: Start-up time control settings
12.3 – 19.2
12.3 – 19.2
12.4 - 19.8
12.8 - 19.7
12.4 - 19.8
12.8 - 19.7
12.9 - 21
13 - 17.3
12.9 - 21
13 - 17.3
Startup
Startup
delay
delay
[µs]
[µs]
rev 2.0, 2010.11.08
-
-
160 fsrms
Default
Page 19 of 34
'000'
ctrl<2:0>
startup_
D15 D14D13D12D11D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
other
100
000
001
010
011
Clock frequency
Do not use
130 – 200
320 - 500
200 - 320
80 - 130
[MSPS]
60 – 80
range
Dual channel
X X X X X X X X
[clock cycles]
Startup delay
6144
3968
2560
1680
1040
-
High Speed Mode
X X X
12.3 – 19.2
12.4 - 19.8
12.8 - 19.7
12.9 - 21
13 - 17.3
Startup
delay
[µs]
Address
-
0x56
0x30
Hex