Datasheet

AD9548 Data Sheet
Rev. E | Page 12 of 112
Parameter Min Typ Max Unit Test Conditions/Comments
TIMING
SCL Clock Rate 400 kHz
Bus-Free Time Between a Stop and Start
Condition, t
BUF
1.3 µs
Repeated Start Condition Setup Time,
t
SU; STA
0.6 µs
Repeated Hold Time Start Condition, t
HD; STA
0.6 µs After this period, the first clock
pulse is generated.
Stop Condition Setup Time, t
SU; STO
0.6 µs
Low Period of the SCL Clock, t
LO
1.3 µs
High Period of the SCL Clock, t
HI
0.6 µs
SCL/SDA Rise Time, t
R
20 + 0.1 C
b
1
300 ns
SCL/SDA Fall Time, t
F
20 + 0.1 C
b
1
300 ns
Data Setup Time, t
SU; DAT
100 ns
Data Hold Time, t
HD; DAT
100 ns
Capacitive Load for Each Bus Line, C
b
1
400 pF
1
C
b
is the capacitance (pF) of a single bus line.
JITTER GENERATION
Table 19.
Parameter Min Typ Max Unit Test Conditions/Comments
JITTER GENERATION
f
REF
= 1 Hz
1
; f
DDS
= 122.88 MHz
2
; f
LOOP
= 0.01 Hz
3
f
SYSCLK
= 20 MHz
4
OCXO; f
S
= 1 GHz
5
; Q-
divider = 1; default SysClk PLL charge pump
current; results valid for LVPECL, LVDS, and
CMOS output logic types
Bandwidth: 100 Hz to 61 MHz 0.81 ps rms Random jitter
Bandwidth: 5 kHz to 20 MHz 0.73 ps rms Random jitter
Bandwidth: 20 kHz to 80 MHz 0.79 ps rms Random jitter
Bandwidth: 50 kHz to 80 MHz 0.78 ps rms Random jitter
Bandwidth: 4 MHz to 80 MHz 0.37 ps rms Random jitter
f
REF
= 8 kHz
1
; f
DDS
= 155.52 MHz
2
; f
LOOP
= 100 Hz
3
f
SYSCLK
= 50 MHz
4
crystal;
f
S
= 1 GHz
5
; Q-divider = 1; default SYSCLK
PLL charge pump current; results valid for
LVPECL, LVDS, and CMOS output logic types
Bandwidth: 100 Hz to 77 MHz 0.71 ps rms Random jitter
Bandwidth: 5 kHz to 20 MHz 0.34 ps rms Random jitter
Bandwidth: 20 kHz to 80 MHz 0.43 ps rms Random jitter
Bandwidth: 50 kHz to 80 MHz 0.43 ps rms Random jitter
Bandwidth: 4 MHz to 80 MHz 0.31 ps rms Random jitter
f
REF
= 19.44 MHz
1
; f
DDS
= 155.52 MHz
2
; f
LOOP
= 1 kHz
3
f
SYSCLK
= 50 MHz
4
crystal;
f
S
= 1 GHz
5
; Q-divider = 1; default SYSCLK
PLL charge pump current; results valid for
LVPECL, LVDS, and CMOS output logic types
Bandwidth: 100 Hz to 77 MHz 1.05 ps rms Random jitter
Bandwidth: 5 kHz to 20 MHz
0.34
ps rms
Random jitter
Bandwidth: 20 kHz to 80 MHz 0.43 ps rms Random jitter
Bandwidth: 50 kHz to 80 MHz 0.43 ps rms Random jitter
Bandwidth: 4 MHz to 80 MHz 0.32 ps rms Random jitter