SY88903V Datasheet by Microchip Technology

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1
SY88903V
Micrel, Inc.
M9999-111307
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
3.3V and 5V power supply option
Up to 1.25Gbps operation
Low noise
Chatter-free LOS generation
Open collector TTL LOS output
TTL /EN Input
Differential PECL inputs for data
Single power supply
Designed for use with laser diode driver and
controller
Available in a tiny 10-pin (3mm ××
××
×3mm) MSOP
The SY88903V limiting post amplifier with its high gain
and wide bandwidth is ideal for use as a post amplifier in
fiber optic receivers with data rates up to 1.25Gbps. Signals
as small as 5mVpp can be amplified to drive devices with
PECL inputs. The SY88903V generates a chatter-free, Loss-
-of-Signal (LOS), open-collector TTL output.
The SY88903V is an integrated limiting amplifier intended
for high-frequency fiber optic applications. The circuit
connects to typical transimpedance amplifiers found within
a fiber optics link. The linear signal output from a
transimpedance amplifier can contain significant amounts
of noise, and may vary in amplitude over time. The
SY88903V limiting amplifier quantizes the signal and outputs
a voltage-limited waveform.
The /EN pin allows the user to disable the output signal
without removing the input signal.
The SY88903V incorporates a programmable level detect
function to identify when the input signal has been lost.
This information can be fed back to the /EN input of the
device to maintain stability under loss of signal condition.
The sensitivity of the level detection can be adjusted using
LOSLVL. The LOSLVL voltage can be set by connecting a
resistor divider between VCC and VREF as shown in Figure
3. “Typical Characteristics” show the relationship between
input level sensitivity and the voltage set on LOSLVL.
The LOS output is a TTL open-collector output that
requires a pull-up resistor for proper operation, Figure 1.
SY88903V
LOS 2.5k
V
CC
Figure 1. LOS Output with Desired Rise Time
All support documentation can be found on Micrel’s web
site at www.micrel.com.
FEATURES
APPLICATIONS
1.25Gbps Gigabit Ethernet
531Mbps and 1062Mbps Fibre Channel
622Mbps SONET
Gigabit Interface Converter
BLOCK DIAGRAM
Limiting
Amplifer
ECL
Buffer
D
IN
D
IN
V
REF
V
CC
GND
LOS
LVL
Enable
Level
Detect
D
OUT
D
OUT
EN
LOS
Rev.: F Amendment: /0
Issue Date:
November 2007
5V/3.3V 1.25Gbps HIGH-SPEED
LIMITING POST AMPLIFIER SY88903V
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2
SY88903V
Micrel, Inc.
M9999-111307
hbwhelp@micrel.com or (408) 955-1690
Pin Number Pin Name Type Pin Function
1ENTTL Input Output Enable (Active Low).
2DIN Data Input Data Input.
3/DIN Data Input Inverting Data Input.
4VREF Output Reference Voltage Output for LOS Level Set (see Figure 3).
5LOSLVL Input LOS Limit Set.
6GND Ground Ground
7LOS TTL Output Loss-of-Signal Indicator (Active Low).
(Open Collector)
8/DOUT PECL Output Inverting Data Output.
9DOUT PECL Output Data Output.
10 VCC Power Supply Positive Power Supply.
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
Package Operating Package Lead
Part Number Type Range Marking Finish
SY88903VKC K10-1 Commercial 903V with Sn-Pb
Pb-free bar-line indicator
SY88903VKCTR(2) K10-1 Commercial 903V with Sn-Pb
Pb-free bar-line indicator
SY88903VKG K10-1 Industrial 903V with NiPdAu
Pb-free bar-line indicator Pb-Free
SY88903VKGTR(2) K10-1 Industrial 903V with NiPdAu
Pb-free bar-line indicator Pb-Free
Notes:
1. Contact factory for die availability. Die is guaranteed at TA = 25°C, DC electricals only.
2. Tape and Reel.
PIN DESCRIPTION
LOSLVL GND65
1/EN
DIN
/DIN
VREF
10 VCC
DOUT
/DOUT
LOS
9
8
7
2
3
4
10-Pin MSOP (K10-1)
3
SY88903V
Micrel, Inc.
M9999-111307
hbwhelp@micrel.com or (408) 955-1690
Absolute Maximum Ratings(1)
Supply Voltage (VCC)....................................... 0V to +7.0V
Input Voltage (DIN, /DIN, /EN, LOSLVL)............... 0V to VCC
Output Voltage
(DOUT, /DOUT) with 50 Load ... VCC –2.5V to VCC +0.3V
(VREF) ............................................VCC –2.0V to VCC
Lead Temperature (soldering, 20 sec.) ..................... 260°C
Maximum Operating Junction Temperature (TJ) ..... +125°C
Storage Temperature (TS) ....................... –55°C to +125°C
Operating Ratings(2)
Supply Voltage (VIN)................................. +2.97V to +5.5V
Ambient Temperature (TA) ......................... –40°C to +85°C
Package Thermal Resistance
MSOP (θJA) Still-air ........................................... 113°C/W
VCC = +5V ±10% or +3.3V ±10%; RLOAD = 50 to VCC –2V; TA = –40°C to +85°C; unless noted.
Symbol Parameter Condition Min Typ Max Units
ICC Power Supply Current No output load 30 42 mA
IIL /EN Input LOW Current VIN = 0.5V –0.3 mA
IIH /EN Input HIGH Current VIN = 2.7V 20 µA
VIN = VCC 100
VCMR Common Mode Range GND +2.0 VCC V
VOFFSET Differential Output Offset ±160 mV
LOSLVL LOSLVL Level VREF VCC V
VOL LOS Output Low Level IOL = +2mA 0.5 V
IOH LOS Output Leakage VOH = 5.5V 250 µA
VOH DOUT and /DOUT VCC –1085 VCC –955 VCC –880 mV
HIGH Output
VOL DOUT and /DOUT VCC –1830 VCC –1705 VCC –1620 mV
LOW Output
VREF Reference Supply VCC –1.38 VCC –1.32 VCC –1.26 V
IREF VREF Output Current –0.8 0.5 mA
VIH /EN Input HIGH Voltage 2.0 V
VIL /EN Input LOW Voltage 0.8 V
Notes:
1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratings conditions for extended
periods may affect device reliability.
2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
DC ELECTRICAL CHARACTERISTICS
4
SY88903V
Micrel, Inc.
M9999-111307
hbwhelp@micrel.com or (408) 955-1690
VCC = +5V ±10% or +3.3V ±10%; RLOAD = 50 to VCC –2V; TA = –40°C to +85°C; unless noted.
Symbol Parameter Condition Min Typ Max Units
PSRR Power Supply(3) Input referred, 55MHz 35 dB
Rejection Ratio
VID Input Voltage Range 5 1800 mVpp
tr, tfOutput Rise/Fall Time VID > 100mVpp 260 ps
VID < 100mVpp trin,tfin
VOD Differential Output VID = 15mVpp 600 mV
Voltage Swing(4) VID = 5mVpp 200 mV
tOFFL LOS Release Time(5) 0.1 0.5 µs
Minimum Input
tOFFH LOS Release Time(6) 0.1 0.5 µs
Maximum Input
tONL LOS Assert Time(5) 0.2 0.5 µs
VSR LOS Sensitivity Range 223–1 pattern 5 50 mVpp
HYS LOS Hysteresis 223–1 pattern 2 4.6 8 dB
Notes:
3. Input referred noise = RMS output noise/low frequency gain.
4. Input is a 622MHz square wave.
5. Input is a 200MHz square wave, tr < 300ps, 8mVpp.
6. Input is a 200MHz square wave, tr < 300ps, 1.8Vpp.
AC ELECTRICAL CHARACTERISTICS
TYPICAL CHARACTERISTICS
0
10
20
30
40
50
60
70
80
90
100
0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2
INPUT LEVEL (mVpp)
LOSLVL VCC – V
LOS Assert and De-assert
Levels vs LOSLVL
3.3V
T
A
= 25°C
1.25Gbps
Pattern 2
7
-1
0
10
20
30
40
50
60
70
80
90
100
0-0.2-0.4 -0.6 -0.8 -1.0 -1.2
INPUT LEVEL (mV
pp
)
LOSLVL V
CC
– V
LOS Assert and De-assert
Levels vs LOS
LVL
5.0V
T
A
= 25°C
1.25Gbps
Pattern 2
7
-1
ii w
5
SY88903V
Micrel, Inc.
M9999-111307
hbwhelp@micrel.com or (408) 955-1690
Output Termination
The SY88903V outputs must be terminated with a 50
load to VCC –2V (or Thevenin equivalent).
Layout and PCB Design
Since the SY88903V is a high-frequency component,
performance can largely be determined by board layout
and design. A common problem with high-gain amplifiers is
feedback from the large swing outputs to the input via the
power supply.
DESIGN PROCEDURE
R1
R2
V
REF
LOS
LVL
V
CC
Figure 3. LOSLVL Circut
5050
0.1µF
0.1µF
0.1µF
V
REF
D
IN–
D
IN+
Figure 2. Differential Input Configuration
The SY88903V ground pin should be connected to the
circuit board ground. Use multiple PCB vias close to the
part to connect to ground. Avoid long, inductive runs which
can degrade performance.
Notes:
LOS
LVS
= V
CC
-1.32V x
R1 + R2 2.6k
R1
R1 + R2
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6
SY88903V
Micrel, Inc.
M9999-111307
hbwhelp@micrel.com or (408) 955-1690
10-PIN MSOP (K10-1)
Rev. 00
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2006 Micrel, Incorporated.

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