ONET2804T Datasheet, PDF (1/6 Pages) Texas Instruments – 28 Gbps 4-Channel Limiting TIA

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ONET2804T 28 Gbps 4-Channel Limiting TIA
ONET2804T
SLLSEL0 – JULY 2014
1 Features
•1 4-Channel Multi-Rate operation up to 28 Gbps
• 10 kΩ Differential Transimpedance
• 21 GHz Bandwidth
• Programmable Output Voltage
• Adjustable Gain and Bandwidth
• Received Signal Strength Indicator (RSSI) for
each Channel
• Single 3.3 V Supply
• Pad Control or 2-Wire Control
• On Chip Filter Capacitors
• –40°C to 100°C Operation
• Die Size: 3250 μm × 1450 μm, 750 μm Channel
Pitch
2 Applications
• 100 Gigabit Ethernet Optical Receivers
• ITU OTL4.4
• CFP2, CFP4, and QSFP28 Modules with Internal
Retiming
3 Description
The ONET2804T is a high gain limiting
transimpedance amplifier for parallel optical
interconnects with data rates up to 28 Gbps. The
device is used in conjunction with a 750 μm pitch
photodiode array to convert an optical signal into a
differential output voltage. An internal circuit provides
the photodiode reverse bias voltage and senses the
average photocurrent supplied to each photodiode.
The device can be used with pin control or a two-wire
serial interface to allow control of the output
amplitude, gain, bandwidth and input threshold.
The ONET2804T provides 21 GHz bandwidth, a gain
of 10 kΩ, and a received signal strength indicator
(RSSI) for each channel.
The part requires a single 3.3 V supply and provides
a differential output amplitude of 450 mV_PP. It is
characterized for operation from –40°C to 100°C
temperatures and is available in die form with a 750
μm channel pitch.
To request a full data sheet, please send an email to:
[e-mail].
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ONET2804T
Base die in Waffle
Pack
3250 µm × 1450 µm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
VCC
330pF
RSSI
RRSSI
Eye Diagram
Photodiode
FILTER1
IN1
FILTER1
1 CHANNEL of 4
GND
GND
OUT+
OUT-
GND
GND
0.1F
OUT1+
OUT1-
0.1F
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.