4
LTC1749
1749f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
0
ENC Period (Note 9) ● 12.5 2000 ns
t
1
ENC High (Note 8) ● 6 1000 ns
t
2
ENC Low (Note 8) ● 6 1000 ns
t
3
Aperture Delay (Note 8) 0 ns
t
4
ENC to CLKOUT Falling C
L
= 10pF (Note 8) ● 1 2.4 4 ns
t
5
ENC to CLKOUT Rising C
L
= 10pF (Note 8) t
1
+ t
4
ns
For 80Msps 50% Duty Cycle C
L
= 10pF (Note 8) ● 7.25 8.65 10.25 ns
t
6
ENC to DATA Delay C
L
= 10pF (Note 8) ● 2 4.9 7.2 ns
t
7
ENC to DATA Delay (Hold Time) (Note 8) ● 1.4 3.4 4.7 ns
t
8
ENC to DATA Delay (Setup Time) C
L
= 10pF (Note 8) t
0
– t
6
ns
For 80Msps 50% Duty Cycle C
L
= 10pF (Note 8) ● 5.3 7.6 10.5 ns
t
9
CLKOUT to DATA Delay (Hold Time), (Note 8) ● 6ns
80Msps 50% Duty Cycle
t
10
CLKOUT to DATA Delay (Setup Time), C
L
= 10pF (Note 8) ● 2.1 ns
80Msps 50% Duty Cycle
Data Latency 5 cycles
The ● indicates specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
TI I G CHARACTERISTICS
UW
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DD
Positive Supply Voltage 4.75 5.25 V
I
DD
Positive Supply Current ● 290 338 mA
P
DIS
Power Dissipation ● 1.45 1.69 W
OV
DD
Digital Output Supply Voltage 0.5 V
DD
V
The ● indicates specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
POWER REQUIRE E TS
WU
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
DD
= 5.25V, MSBINV and PGA ● 2.4 V
V
IL
Low Level Input Voltage V
DD
= 4.75V, MSBINV and PGA ● 0.8 V
I
IN
Digital Input Current V
IN
= 0V to V
DD
● ±10 µA
C
IN
Digital Input Capacitance MSBINV and PGA Only 1.5 pF
V
OH
High Level Output Voltage OV
DD
= 4.75V I
O
= –10µA 4.74 V
I
O
= –200µA ● 4 4.74 V
V
OL
Low Level Output Voltage OV
DD
= 4.75V I
O
= 160µA 0.05 V
I
O
= 1.6mA ● 0.1 0.4 V
I
SOURCE
Output Source Current V
OUT
= 0V –50 mA
I
SINK
Output Sink Current V
OUT
= 5V 50 mA
The ● indicates specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
DIGITAL I PUTS A D DIGITAL OUTPUTS
UU
