MAX3800UHJ Maxim Integrated Products, MAX3800UHJ Datasheet - Page 6

• Manufacturer Part Number: MAX3800UHJ
• Description: IC EQUALIZER DRVR 3.2GBPS 32TQFP
• Manufacturer: Maxim Integrated Products
• Type: Driverr

Specifications of MAX3800UHJ

• Number Of Drivers/receivers: 1/0
• Voltage - Supply: 3.14 V ~ 3.46 V
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP Exposed Pad, 32-eTQFP, 32-HTQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Protocol: -

3.2Gbps Adaptive Equalizer
and Cable Driver
The MAX3800 consists of a cable driver (transmitter)
and an adaptive cable equalizer (receiver). The driver
and equalizer are implemented on the same chip, but
they are completely independent.
The cable driver accepts differential or single-ended
current-mode logic (CML) input data at rates up to
3.2Gbps. The driver output is also implemented using
CML. The maximum output amplitude can be adjusted
over a typical range of 450mV to 870mV by changing
the value of the RMOD resistor between 10kΩ and
20kΩ (this resistor is connected between the RMOD pin
and ground).
The adaptive cable equalizer accepts differential CML
input data at rates up to 3.2Gbps and is capable of
equalizing differential or single-ended signals. It auto-
matically adjusts to attenuation levels of up to 30dB at
1.6GHz (due to skin-effect losses in copper cable). The
equalizer consists of a CML input buffer, a loss-of-sig-
6
1, 3, 6, 11, 14
23, 24, 26, 31
19, 22, 27,
2, 7, 10, 15,
_______________________________________________________________________________________
16, 17
30, 32
PIN
12
13
18
20
21
25
28
29
EP
4
5
8
9
Exposed
DOUT+
EOUT+
DOUT-
NAME
EOUT-
RMOD
The Adaptive Cable Equalizer
V
CIM+
V
DIN+
EIN+
GND
CIM-
DIN-
EIN-
N.C.
LOS
Pad
CCD
CCE
Detailed Description
Equalizer Power Supply
Ground
Positive Equalizer Input, CML
Negative Equalizer Input, CML
Negative Cable Integrity Monitor (CIM) Output
Positive Cable Integrity Monitor (CIM) Output
Negative Equalizer Output, CML
Positive Equalizer Output, CML
No Connection. Leave unconnected.
Equalizer Loss-of-Signal Output, Active-Low
Driver Power Supply
Positive Driver Input, CML
Negative Driver Input, CML
Driver Output Modulation Adjust. A resistor connected from this pin to GND controls driver output
voltage.
Positive Driver Output, CML
Negative Driver Output, CML
Ground. The exposed pad must be soldered to the circuit board ground plane for proper thermal
and electrical performance.
The Cable Driver
nal detector, a flat response amplifier, a skin-effect
compensation amplifier, a current-steering network, a
dual power-detector feedback loop, an output limiting
amplifier, and a CML output buffer
The shape of the power spectrum of a random bit
stream can be described by the square of the sinc
function, where sinc f = (sin πf) / πf. For sufficiently long
bit patterns (nonrandom bit streams), sinc
approximation. From the shape of the sinc
we can estimate the ratio of the power densities at any
two frequencies. The MAX3800 adaptive equalizer
employs this principle by incorporating a feedback loop
that continuously monitors the power at two frequencies
and dynamically adjusts the equalizer to maintain the
correct power ratio.
The input and output buffers are implemented using
current-mode logic (CML). Equivalent circuits are
shown in
FUNCTION
Figures 2 and
CML Input and Output Buffers
3. For details on interfacing with
General Theory of Operation
Pin Description
(Figure
2
1).
2
(f) is a good
(f) function,