Micrel, Inc.
3.3V 10.7Gbps CML LIMITING POST AMPLIFIER W/ TTL SD AND /SD
DESCRIPTION
SY88953L
SY88953L
FEATURES
■ ■ ■ ■ ■ ■ Single 3.3V power supply Up to 10.7Gbps operation 800mVp-p output swing with 30ps edge rates 28dB voltage gain with 5mVp-p input sensitivity On chip 50Ω I/O termination Programmable signal detect (SD and /SD) with 6dB hysteresis ■ Chatter-free OC-TTL SD and /SD outputs with internal 5kΩ pull-up resistors can feedback to TTL enable (/EN) input ■ Available in a tiny (3mm × 3mm) 16-pin MLF® package or die
APPLICATIONS
■ ■ ■ ■ ■ OC-192 SDH/SONET 10G Ethernet/Fibre Channel receivers Upto 10.7Gbps proprietary link XFP transceivers Line driver/receiver
The SY88953L high-speed limiting post amplifier is designed for use in fiber-optic receivers. The device connects to typical transimpedance amplifiers (TIAs). The linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88953L quantizes these signals and outputs CML level waveforms. The SY88953L operates from a single +3.3V power supply, over temperatures ranging from –40°C to +85°C. With its wide bandwidth and high gain, signals with data rates up to 10.7Gbps and as small as 5mVp-p can be amplified to drive devices with CML inputs. The SY88953L outputs TTL signal-detect (SD and /SD) signals. A programmable signal-detect level set pin (SDLVL) sets the sensitivity of the input amplitude detection. SD asserts high if the input amplitude rises above the threshold set by SDLVL and deasserts low otherwise. /SD is the complementary output of SD. /SD can be fedback to the enable (/EN) input to maintain output stability under a loss of signal condition. /EN deasserts the true output signal without removing the input signal. Typically 6dB SD hysteresis is provided to prevent chattering. www.DataSheet4U.com The SY88953L also includes an input threshold adjustment to correct pulsewidth distortion.
TYPICAL APPLICATIONS CIRCUIT
SD
VCC
0.1µF
VTHP DIN /DIN VTHN
/SD
/EN
DOUT
0.1µF
From Transimpedance Amp.
0.1µF
SY88953L
SDLVL
/DOUT
To CDR
0.1µF
GND
VCC
200kΩ
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
M9999-081506
[email protected] or (408) 955-1690
Rev.: C Amendment: /0
1
Issue Date: August 2006
Micrel, Inc.
SY88953L
PACKAGE/ORDERING INFORMATION
SDLVL
Ordering Information
GND
VTHP
/EN
Part Number
16 15 14 13 12 11 10 9 5 6 7 8
Package Type MLF-16 MLF-16 MLF-16 MLF-16
Operating Range Industrial Industrial Industrial Industrial
Package Marking 953L 953L 953L with Pb-Free bar-line indicator 953L with Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
SY88953LMI
DOUT VCC VCC /DOUT
DIN VCC VCC /DIN
1 2 3 4
SY88953LMITR(1) SY88953LMG SY88953LMGTR(1)
Note: 1. Tape and Reel.
VTHN
SD
16-Pin MLF®
PIN DESCRIPTION
Pin Number 1 2, 3, 10, 11 4 5 6 Pin Name DIN VCC /DIN VTHN SD Type Data Input Power Supply Data Input Input Open-collector TTL output w/ i.