4
LTC1520
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
FREQUENCY (MHz)
0
SUPPLY
CURRENT
(mA)
25
20
15
10
5
0
20
1520 G07
5
10
15
25
100
°C
25
°C
0
°C
–45
°C
1 RECEIVER SWITCHING
Supply Current vs Temperature
and Frequency
FREQUENCY (MHz)
0
DUTY
CYCLE
(%)
10
20
25
50.0
49.5
49.0
48.5
48.0
47.5
47.0
46.5
46.0
45.5
1520 G09
515
VIN = 50% DUTY CYCLE
TEMPERATURE (
°C)
–10
SKEW
(ps)
400
390
380
370
360
350
340
10
30
50
70
1520 G08
90
110
Skew vs Temperature (tSKD)
Output Duty Cycle vs Frequency
FREQUENCY (Hz)
10
42.0
COMMON
MODE
REJECTION
RATIO
(dB)
42.5
43.5
44.0
44.5
46.5
LTC1520 G04
43.0
1k
100k
10M
45.0
45.5
46.0
TA = 25°C
CMRR vs Frequency
FREQUENCY (MHz)
0
SUPPLY
CURRENT
(mA)
50
45
40
35
30
25
20
15
10
5
0
20
1520 G05
5
10
15
25
ALL 4
RECEIVERS
SWITCHING
1 RECEIVER
SWITCHING
Supply Current vs Frequency
Propagation Delay vs Load
Capacitance (tPLH/tPHL)
LOAD CAPACITANCE (pF)
5
PROPAGATION
DELAY
(ns)
30
25
20
15
10
5
0
15
25
35
55
1520 G06
105
205
TA = 25°C
VID = 500mV
VCM = 2.5V
B1 (Pin 1): Receiver 1 Inverting Input.
A1 (Pin 2): Receiver 1 Noninverting Input.
RO1 (Pin 3): Receiver 1 Output.
Enable (Pin 4): Receiver Output Enable Pin. A logic high
input enables the receiver outputs. A logic low input
forces the receiver outputs into a high impedance state.
Do not float.
RO2 (Pin 5): Receiver 2 Output.
A2 (Pin 6): Receiver 2 Noninverting Input.
B2 (Pin 7): Receiver 2 Inverting Input.
GND (Pin 8): Ground Pin. A ground plane is recommended
for all LTC1520 applications.
B3 (Pin 9): Receiver 3 Inverting Input.
A3 (Pin 10): Receiver 3 Noninverting Input.
RO3 (Pin 11): Receiver 3 Output.
NC (Pin 12): No Connection.
RO4 (Pin 13): Receiver 4 Output.
A4 (Pin 14): Receiver 4 Noninverting Input.
B4 (Pin 15): Receiver 4 Inverting Input.
VDD (Pin 16): 5V Supply Pin. This pin should be decoupled
with a 0.1
F ceramic capacitor as close as possible to the
pin. Recommended: VDD = 5V ±5%.
PIN FUNCTIONS
UU
U