Datasheet

MAX3645
+2.97V to +5.5V, 125Mbps to 200Mbps Limiting
Amplifier with Loss-of-Signal Detector
4 _______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= 3.3V, PECL outputs terminated with 50Ω to V
CC
- 2V, R
TH
= 100Ω, C
AZ
= 0.1µF, C
SD
= 1nF, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
(EXCLUDES PECL OUTPUT CURRENTS)
MAX3645 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
603510-15
10
15
20
25
30
35
40
45
50
5
-40 85
V
CC
= 5.0V
V
CC
= 3.3V
OUTPUT EYE DIAGRAM
(V
IN
= 1mV
P-P
, 155Mbps, 2
23
- 1PRBS)
MAX3654 toc02
1ns/div
200mV/
div
OUTPUT EYE DIAGRAM
(V
IN
= 1500mV
P-P
, 155Mbps, 2
23
- 1PRBS)
MAX3645 toc03
1ns/div
200mV/
div
TRANSFER FUNCTION
MAX3654 toc04
DIFFERENTIAL INPUT VOLTAGE (mV
P-P
)
DIFFERENTIAL OUTPUT VOLTAGE (mV
P-P
)
1010.1
600
800
1000
1200
1400
1600
1800
2000
400
0.01 100
R
TH
= 1kΩ
R
TH
= 2kΩ
R
TH
= 100Ω
R
TH
= 0Ω
BIT-ERROR RATIO vs.
DIFFERENTIAL INPUT VOLTAGE
MAX3645 toc05
DIFFERENTIAL INPUT VOLTAGE (mV
P-P
)
BIT-ERROR RATIO
0.70.60.4 0.50.2 0.30.1
10
-3
10
-4
10
-5
10
-6
10
-7
10
-8
10
-9
10
-10
10
-11
10
-12
0 0.8
155Mbps, 2
23
- 1 PRBS
INPUT-REFERRED RMS NOISE
vs. TEMPERATURE
MAX3645 toc06
TEMPERATURE (°C)
INPUT-REFERRED NOISE (µV
RMS
)
603510-15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
15
-40 85
V
CC
= +5.0V
V
CC
= +3.3V
SMALL-SIGNAL GAIN vs. R
TH
MAX3645 toc07
R
TH
(kΩ)
20log (V
OUT
/V
IN
) (dB)
1.71.51.0 1.20.5 0.70.2
10
20
30
40
50
60
70
80
90
100
0
02.0
V
IN
= 0.1mV
P-P
LOSS-OF-SIGNAL THRESHOLD
vs. R
TH
(V
CC
= +3.3V AND +5.0V)
MAX3645 toc08
R
TH
(kΩ)
DIFFERENTIAL INPUT VOLTAGE (mV
P-P
)
1.81.61.2 1.40.4 0.6 0.8 1.00.2
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
0
0 2.0
LOS DEASSERT
LOS ASSERT
155Mbps, 2
23
- 1 PRBS
LOSS-OF-SIGNAL HYSTERESIS
vs. TEMPERATURE
MAX3645 toc09
TEMPERATURE (°C)
10log (DEASSERT/ASSERT) (dB)
603510-15
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
1.2
-40 85
R
TH
= 2kΩ
R
TH
= 100Ω
R
TH
= 1kΩ
155Mbps, 2
23
- 1 PRBS