MAX3665

622Mbps, Ultra-Low-Power, 3.3V Transimpedance Preamplifier for SDH/SONET


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Description

The MAX3665 low-power transimpedance preamplifier for 622Mbps SDH/SONET applications consumes only 70mW at VCC = 3.3V. Operating from a single +3.3V or +5.0V supply, it converts a small photodiode current to a measurable differential voltage. A DC cancellation circuit provides a true differential output swing over a wide range of input current levels, thus reducing pulse-width distortion. The differential outputs are back-terminated with 50Ω per side.

The overall transimpedance gain is nominally 8kΩ. For input signal levels beyond approximately 50µAp-p, the amplifier will limit the output swing to 250mV. The MAX3665's low 55nA input noise provides a typical sensitivity of -33.2dBm in 1300nm, 622Mbps receivers.

The MAX3665 is designed to be used in conjunction with the MAX3676 clock recovery and data retiming IC with limiting amplifier. Together they form a complete 3.3V or 5.0V 622Mbps SDH/SONET receiver.

In die form, the MAX3665 is designed to fit on a header with a PIN diode. It includes a filter connection that provides positive bias for the photodiode through a 1.5kΩ resistor to VCC. The device is available in an 8-pin µMAX® package.
MAX3665: Typical Application Circuit MAX3665: Typical Application Circuit Enlarge+

Key Features

  • +3.3V or +5.0V Single-Supply Operation
  • 55nARMS Input-Referred Noise
  • 70mW Power Consumption at VCC = 3.3V
  • 8kΩ Gain
  • 450µA Peak Input Current
  • 260ps (max) Deterministic Jitter
  • Differential Output Drives 100ΩLoad
  • 470MHz Bandwidth

Applications/Uses

  • PIN Photodiode Preamplifiers and Receivers
  • Regenerators for SDH/SONET
  • SDH/SONET Receivers

See parametric specs for Transimpedance Amplifiers (TIA) (15)


Part NumberTarget Oper. Range
(Gbps)
Data Rate
(Mbps)
VSUPPLY
(V)
ICC
(mA)
Input Noise
(nA)
Bandwidth
(MHz)
ZT
(kΩ)
Package/PinsBudgetary
Price
(max)(typ)(max)(min)(See Notes)
MAX3665 <1622
3.3
5
25624707
DICE SALES/N
UMAX/8
WAFER SAWN/N
$7.00 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX3665.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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