MAX3805ETE#TG16 Maxim Integrated Products, MAX3805ETE#TG16 Datasheet - Page 5

• Manufacturer Part Number: MAX3805ETE#TG16
• Description: IC EQUALIZER REC 10.7GBPS 16TQFN
• Manufacturer: Maxim Integrated Products
• Type: Transmitterr

Specifications of MAX3805ETE#TG16

• Protocol: Ethernet
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Drivers/receivers: -

The MAX3805 adaptive equalizer is designed to oper-
ate with 9.95Gbps to 10.7Gbps PRBS nonreturn-to-zero
(NRZ) data at the receive end of a transmission line,
typically differential 6-mil FR-4 PC board. It adaptively
corrects intersymbol interference caused by frequency-
dependent path loss. It can also be used with coaxial
cable links and with transmission lines that include well-
engineered connectors, as long as the total path loss is
relatively smooth and does not exceed 20dB at 5GHz.
The signal path for the MAX3805 consists of a CML
input stage, two amplifiers feeding a pair of variable
attenuators controlled by feedback, and a limiting
amplifier with a CML output stage. An enable input, EN,
is used to control the output stage. A signal-detect out-
put, SD, indicates when input signal to the transmission
line is above 220mV
See the Functional Diagram .
9, 12
PIN
10
11
13
14
15
16
EP
1
2
3
4
5
6
7
8
Exposed
NAME
SDO+
HFPD
LFPD
SDO-
V
SDI+
V
GND
GND
V
GND
SDI-
V
Pad
SD
EN
CC1
CC1
CC2
CC
Applications Information
Detailed Description and
_______________________________________________________________________________________
P-P
Supply Voltage, CML Input (1.8V to V
Positive Differential Serial Data Input, CML
Negative Differential Serial Data Input, CML
Supply Voltage, CML Input (1.8V to V
Supply Ground
Signal-Detect Output, LVCMOS. Low indicates <200mV
Enable Input, LVCMOS. Low disables output, high enables output, typically connected to SD.
Supply Ground
Supply Voltage, CML Output (1.8V to V
Negative Differential Serial Data Output, CML
Positive Differential Serial Data Output, CML
High-Frequency Power Detector. Leave open for 9.95Gbps to 10.7Gbps PRBS NRZ data.
Low-Frequency Power Detector. Leave open for 9.95Gbps to 10.7Gbps PRBS NRZ data.
Supply Voltage, Equalizer Core, 3.3V
Supply Ground
Ground. The exposed pad must be soldered to the circuit board ground plane for proper thermal and
electrical performance.
10.7Gbps Adaptive Receive Equalizer
or below 200mV
P-P
, typically.
CC
CC
CC
)
)
)
The MAX3805 CML input and output buffers are inter-
nally terminated with 50Ω to V
tively. The input and output circuitry have separate
voltage connections to control noise coupling and pro-
vide DC-coupling to +1.8V, +2.5V, or +3.3V CML. If
desired, the CML inputs and outputs can be AC-cou-
pled. See Figure 1 for the output structure.
The low-frequency cutoff of the input-stage offset-can-
cellation circuit is nominally 21kHz.
For single-ended operation (typically coaxial cable
links), the input must be AC-coupled; connect the
unused input to V
AC-coupling capacitor and a 50Ω resistor, as shown in
Figure 2. Note that the MAX3805 is specified for differ-
ential operation, and the performance may be reduced
in single-ended operation.
FUNCTION
P-P
, high indicates >220mV
CML Input and Output Buffers
CC1
using a series combination of an
Pin Description
CC1
P-P
and V
.
CC2
, respec-
5