MAX3784UTE+

General Description
The MAX3784/MAX3784A 5Gbps equalizers provide
compensation for transmission-medium losses in up to
40in of FR-4. They are optimized for short-run length
and balanced codes such as 8b10b, as found in multi-
plexed 1.25Gbps Ethernet systems and 4.25Gbps
Fibre Channel.
The equalizers use differential CML data inputs and
outputs. A standby mode reduces power consumption
when the parts are not in use. The MAX3784/
MAX3784A are available in a 4mm × 4mm, 16-pin QFN
package that consumes only 185mW at +3.3V.
Features
Spans 40in (1m) of FR-4 PCB
0.18UI Deterministic Jitter Up to 40in
Low Power Consumption: 185mW (MAX3784)
Equalization Reduces Intersymbol Interference
Single +3.3V Supply
Standby Mode
Small 4mm × 4mm, 16-Pin QFN Package
MAX3784/MAX3784A
5Gbps PCB Equalizer
________________________________________________________________
Maxim Integrated Products
1
Pin Configurations
LINE CARD
+3.3V
5Gbps
+3.3V
T/R 1
Rx
Tx
T/R 2
Rx
Tx
T/R 3
Rx
Tx
T/R 4
Rx
Tx
T/R 1
T/R 2
T/R 3
T/R 4
Rx
Tx
1.25Gbps
1.25Gbps
1.25Gbps
1.25Gbps
SWITCH
Rx
Tx
SWITCH CARD
PCB
BACKPLANE
MAX3784/
MAX3784A
EQUALIZER
IN OUT
MAX3784/
MAX3784A
EQUALIZER
OUT IN
Typical Application Circuit
19-2565; Rev 4; 10/07
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART
TEMP
RANGE
PIN-
PACKAGE
PKG
CODE
MAX3784UGE 0°C to +85° C 16 QFN-EP* G1644-1
MAX3784UTE+ 0°C to +85°C 16 TQFN-EP* T1644-3
MAX3784AUGE 0°C to +85°C 16 QFN-EP* G1644-1
MAX3784AUTE+ 0°C to +85°C 16 TQFN-EP* T1644-3
Ordering Information
Applications
Chassis Life Extension
4.25Gbps Fibre Channel
4x Multiplexed 1.25Gbps Ethernet (5Gbps)
+
Denotes a lead-free package.
*Exposed pad.
1
23
4
5
6
7
8
9
10
11
16
12
13
14
15
V
CC
V
CC
V
CC
IN+
IN-
GND
GND
GND
N.C.
N.C.
N.C.
N.C.
N.C.
EN
OUT+
OUT-
* THE EXPOSED PAD MUST BE SOLDERED TO SUPPLY GROUND
FOR CORRECT THERMAL AND ELECTRICAL PERFORMANCE.
MAX3784/
MAX3784A
TOP VIEW
QFN
*EP
Pin Configurations continued at end of data sheet.
MAX3784/MAX3784A
5Gbps PCB Equalizer
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3V to +3.6V, T
A
= 0°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage, V
CC
.................................................-0.5V to +6V
Input Voltage............................................(-0.5V) to (V
CC
+ 0.5V)
Continuous Output Current ...............................-25mA to +25mA
Continuous Power Dissipation (T
A
= +85°C)
16-Pin QFN (derate 25mW/°C above +85°C) ............1600mW
Operating Ambient Temperature Range ................0°C to +85°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
EN = low 30
Supply Power
EN = high 185 250
mW
10Hz < f < 100Hz 100
100Hz < f < 1MHz 40Supply-Noise Tolerance (Note 1)
1MHz < f < 2.5GHz 10
mV
P-P
Latency From input to output 200 ps
CML RECEIVER INPUT
Input Voltage Swing V
IN
Measured differentially at point A in Figure 1 400 1000 mV
P-P
Return Loss 100MHz to 2.5GHz 15 dB
Input Resistance Differential 80 100 120 Ω
EQUALIZATION
20in 0.13 0.21
Residual Deterministic Jitter,
5Gbps
Table 1 (Notes 2–5)
40in 0.18 0.23
UI
P-P
20in 0.08 0.14
Residual Deterministic Jitter,
2.5Gbps
Table 1 (Notes 2–5)
40in 0.13 0.28
UI
P-P
20in 0.04 0.07
Residual Deterministic Jitter,
1.25Gbps
Table 1 (Notes 2–5)
40in 0.07 0.15
UI
P-P
Random Jitter (Notes 5, 6) 1.3 1.9 ps
RMS
CML TRANSMITTER OUTPUT (into 100Ω ±1Ω)
MAX3784 400 600
Output Voltage Swing V
O
Differential swing, measured
differentially at point C in Figure 1
MAX3784A 550 750
mV
P-P
Transition Time t
f,
t
r
20% to 80% (Notes 5, 8) 30 45 60 ps
Output Resistance Single ended 40 50 60 Ω
MAX3784/MAX3784A
5Gbps PCB Equalizer
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3V to +3.6V, T
A
= 0°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C, unless otherwise noted.)
Note 1: Allowed supply noise during jitter tests.
Note 2: Test pattern. This is a combination of K28.5± characters running at the full bit rate and at one-quarter the bit rate. This simu-
lates the multiplexing of four each 1.25Gbps Ethernet data streams.
Pattern (hex) 100 bits
00 FFFF F0F0 FF 0000 0F0F (quarter rate K28.5+, quarter rate K28.5-)
3EB05 (K28.5± 00 1111 1010 11 0000 0101)
Note 3: Difference in deterministic jitter between reference points A and C in Figure 1.
Note 4: Signal source amplitude range is 400mV
P-P
to 1000mV
P-P
differential. Signal is applied differentially at point A as shown in
Figure 1. The deterministic jitter at point B must be from media-induced loss and not from clock-source modulation.
Deterministic jitter is measured at the 50% vertical level of the signal at point C.
Note 5: Guaranteed by design and characterization.
Note 6: Test pattern is K28.5 with 40in trace.
Note 7: On-chip pullup resistor of 40kΩ (typ). Negative current indicates equalizer sources current.
Note 8: Using 00 0001 1111 or equivalent pattern. Measured over entire input voltage range, max and min media loss and within 2in
of output pins.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ENABLE CONTROL PIN
Input High Voltage 1.5 V
Input Low Voltage 0.5 V
Input High Current (Note 7) -150 +10 µA
Input Low Current (Note 7) -150 +10 µA
SIGNAL
SOURCE
A
BACKPLANE PCB
MAX3784/MAX3784A
EQUALIZER
IN OUT
L 40in
6mil LINE
BC
SMA CONNECTOR
SMA CONNECTOR
Figure 1. Test Conditions
PARAMETER CONDITIONS MIN TYP MAX UNITS
Transmission Line Edge-coupled stripline 6 mils
Relative Permittivity FR-4 or similar 4.4 4.5
Loss Tangent FR-4 or similar 0.02 0.022
Metal Thickness 0.7 mils (0.5oz copper) 0.7 mils
Impedance Differential 90 100 110
Table 1. PCB Assumptions (PCB material is FR-4)

MAX3784UTE+

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
Equalizers 5Gbps PCB Equalizer
Lifecycle:
New from this manufacturer.
Delivery:
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