Datasheet

AD9637 Data Sheet
Rev. A | Page 6 of 40
SWITCHING SPECIFICATIONS
AVDD = 1.8 V, DRVDD = 1.8 V, 2 V p-p differential input, 1.0 V internal reference, AIN = −1.0 dBFS, unless otherwise noted.
Table 4.
Parameter
1, 2
Temp Min Typ Max Unit
CLOCK
3
Input Clock Rate Full 10 640 MHz
Conversion Rate Full 10 40/80 MSPS
Clock Pulse Width High (t
EH
) Full 12.5/6.25 ns
Clock Pulse Width Low (t
EL
) Full 12.5/6.25 ns
OUTPUT PARAMETERS
3
Propagation Delay (t
PD
) Full 1.5 2.3 3.1 ns
Rise Time (t
R
) (20% to 80%) Full 300 ps
Fall Time (t
F
) (20% to 80%)
Full
300
ps
FCO Propagation Delay (t
FCO
) Full 1.5 2.3 3.1 ns
DCO Propagation Delay (t
CPD
)
4
Full t
FCO
+ (t
SAMPLE
/24) ns
DCO to Data Delay (t
DATA
)
4
Full (t
SAMPLE
/24) − 300 (t
SAMPLE
/24) (t
SAMPLE
/24) + 300 ps
DCO to FCO Delay (t
FRAME
)
4
Full (t
SAMPLE
/24) − 300 (t
SAMPLE
/24) (t
SAMPLE
/24) + 300 ps
Data to Data Skew
(t
DATA-MAX
− t
DATA-MIN
)
Full
±50
±200
ps
Wake-Up Time (Standby) 25°C 35 μs
Wake-Up Time (Power-Down)
5
25°C 375 μs
Pipeline Latency Full 16 Clock
cycles
APERTURE
Aperture Delay (t
A
) 25°C 1 ns
Aperture Uncertainty (Jitter) 25°C 0.1 ps rms
Out-of-Range Recovery Time 25°C 1 Clock
cycles
1
See the AN-835 Application Note, Understanding High Speed ADC Testing and Evaluation, for definitions and for details on how these tests were completed.
2
Measured on standard FR-4 material.
3
Can be adjusted via the SPI.
4
t
SAMPLE
/24 is based on the number of bits divided by 2 because the delays are based on half duty cycles. t
SAMPLE
= 1/f
S
.
5
Wake-up time is defined as the time required to return to normal operation from power-down mode.
TIMING SPECIFICATIONS
Table 5.
Parameter Description Limit Unit
SYNC TIMING REQUIREMENTS
t
SSYNC
SYNC to rising edge of CLK+ setup time 0.24 ns typ
t
HSYNC
SYNC to rising edge of CLK+ hold time 0.40 ns typ
SPI TIMING REQUIREMENTS See Figure 61
t
DS
Setup time between the data and the rising edge of SCLK 2 ns min
t
DH
Hold time between the data and the rising edge of SCLK 2 ns min
t
CLK
Period of the SCLK 40 ns min
t
S
Setup time between CSB and SCLK 2 ns min
t
H
Hold time between CSB and SCLK 2 ns min
t
HIGH
SCLK pulse width high 10 ns min
t
LOW
SCLK pulse width low 10 ns min
t
EN_SDIO
Time required for the SDIO pin to switch from an input to an output relative to
the SCLK falling edge (not shown in Figure 61)
10 ns min
t
DIS_SDIO
Time required for the SDIO pin to switch from an output to an input relative to
the SCLK rising edge (not shown in Figure 61)
10 ns min