Datasheet

LTC6957-1/LTC6957-2/
LTC6957-3/LTC6957-4
4
6957f
For more information www.linear.com/LTC6957-1
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Inputs (IN
–
, IN
+
)
f
IN
Input Frequency Range
l
300 MHz
V
INSE
Input Signal Level Range, Single-Ended
l
0.2 0.8 2 V
P-P
V
INDIFF
Input Signal Level Range, Differential
l
0.2 0.8 2 V
P-P
t
MIN
Minimum Input Pulse Width High or Low 0.5 ns
V
INCM
Self-Bias Voltage, IN
+
, IN
–
l
1.8 2.06 2.3 V
R
IN
Input Resistance, Differential
l
1.5 2 2.5 kΩ
C
IN
Input Capacitance, Differential 0.5 pF
BW
IN
Input Section Small Signal Bandwidth (–3dB) FILTB = L, FILTA = L
FILTB = L, FILTA = H
FILTB = H, FILTA = L
FILTB = H, FILTA = H
1200
500
160
50
MHz
MHz
MHz
MHz
Outputs (LVPECL)
V
OH
Output High Voltage LTC6957I
LTC6957H
l
l
V
+
– 1.22
V
+
– 1.22
V
+
– 0.98
V
+
– 0.98
V
+
– 0.93
V
+
– 0.87
V
V
V
OL
Output Low Voltage LTC6957I
LTC6957H
l
l
V
+
– 2.1
V
+
– 2.1
V
+
– 1.8
V
+
– 1.8
V
+
– 1.67
V
+
– 1.62
V
V
V
OD
Output Differential Voltage
l
±660 ±810 ±965 mV
t
r
Output Rise Time 180 ps
t
f
Output Fall Time 160 ps
t
PD
Propagation Delay FILTB = L, FILTA = L
FILTB = L, FILTA = H
FILTB = H, FILTA = L
FILTB = H, FILTA = H
l
l
l
l
0.35 0.5
0.6
1.1
3.2
0.7
0.8
1.3
4
ns
ns
ns
ns
∆t
PD
/∆T Propagation Delay Variation Over Temperature FILTB = L, FILTA = L
FILTB = L, FILTA = H
FILTB = H, FILTA = L
FILTB = H, FILTA = H
l
l
l
l
0.1
0.1
0.11
0.15
ps/°C
ps/°C
ps/°C
ps/°C
∆t
PD
/∆V Propagation Delay Variation vs Supply Voltage FILTB = L, FILTA = L
l
4 50 ps/V
t
SKEW
Output Skew, Differential, CH1 to CH2
l
3 30 ps
t
MATCH
Output Matching (OUTx
+
to OUTx
–
) See Timing Diagram
l
2.5 30 ps
Power
V
+
V
+
Operating Supply Voltage Range R
LOAD
= 50Ω to (V
+
– 2V)
l
3.15 3.3 3.45 V
I
S
Supply Current
Both Outputs Enabled (SD1 = SD2 = L)
One Output Enabled (SD1 = L, SD2 = H or SD1 = H, SD2 = L)
Both Outputs Disabled (SD1 = SD2 = H)
Including Output Loads
No Output Loads
No Output Loads
No Output Loads
R
LOAD
= 50Ω to (V
+
– 2V), ×4
l
l
l
l
18
15
0.7
58
22
19
1.2
72
mA
mA
mA
mA
t
ENABLE
Output Enable Time, Other SDx = L 40 µs
t
WAKEUP
Output Enable Time, Other SDx = H 120 µs
t
DISABLE
Output Disable Time, Other SDx = L 20 µs
t
SLEEP
Output Disable Time, Other SDx = H 20 µs
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 3.3V,
SD1 = SD2 = 0.4V, FILTA = FILTB = 0.4V, R
LOAD
= 50Ω connected to 1.3V, unless otherwise specified. All voltages are with respect to ground.
LTC6957-1