SY88933AL
3.3V, 1.25Gbps PECL High-Sensitivity
Limiting Post Amplifier w/TTL Signal Detect
General Description
The SY88933AL high-sensitivity 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 SY88933AL quantizes these signals
and outputs PECL level waveforms.
The SY88933AL operates from a single +3.3V power
supply, over temperatures ranging from –40
o
C to
+85
o
C. With its wide bandwidth and high gain, signal
with data rates up to 1.25Gbps and as small as 5mV
PP
can be amplified to drive devices with PECL inputs.
The SY88933AL generates a high gain signal-detect
(SD) open-collector TTL output. The SD function has a
high gain input stage for increased sensitivity. A
programmable signal-detect level set pin (SD
LVL
) sets
the sensitivity of the input amplitude detection. SD
asserts high if the input amplitude rises above the
threshold set by SD
LVL
and de-asserts low otherwise.
The enable input (EN) de-asserts the true output signal
without removing the input signal. The SD output can
be fed back to the EN input to maintain output stability
under a loss-of-signal condition. Typically, 3.4dB SD
hysteresis is provided to prevent chattering.
All support documentation can be found on Micrel’s
web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
Single 3.3V power supply
DC-to-1.25Gbps operation
Low-noise PECL data outputs
High gain SD
Chatter-free open-collector TTL signal detect (SD)
output with internal 4.75kΩ pull-up resistor
TTL EN input
Programmable SD level set (SD
LVL
)
Available in a tiny 10-pin MSOP package
Pin-compatible with SY88933V
Applications
•
•
•
•
•
•
GPON/BPON/EPON/GEPON
Gigabit Ethernet
531Mbps and 1062Mbps Fibre Channel
OC-3 and OC-12 SONET/SDH
High-gain line driver and line receiver
Low-gain TIA interface
Markets
•
FTTX
•
Optical transceiver
•
Datacom/telecom
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2007
M9999-021207-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88933AL
Typical Application Circuit
February 2007
2
M9999-021207-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88933AL
Ordering Information
Part Number
SY88933ALKG
SY88933ALKGTR
(1)
SY88933ALKI
SY88933ALKITR
(1)
Note:
1. Tape and Reel.
Package
Type
K10-1
K10-1
K10-1
K10-1
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package Marking
933A with Pb-Free bar line indicator
933A with Pb-Free bar line indicator
933A
933A
Lead
Finish
NiPdAu
Pb-Free
NiPdAu
Pb-Free
SnPb
SnPb
Pin Configuration
10-Pin MSOP (K10-1)
Pin Description
Pin Number
1
Pin Name
EN
Type
TTL Input: Default is
HIGH.
Data Input
Data Input
Pin Function
Enable: This input enables the outputs when it is HIGH. Note that
this input is internally connected to a 25kΩ pull-up resistor and will
default to a logic HIGH state if left open.
True data input.
Complementary data input.
Reference voltage: Placing a capacitor here to V
CC
helps stabilize
SD
LVL
.
Input
Ground
Open-collector TTL
output w/internal
4.75kΩ pull-up
resistor
PECL Output
PECL Output
Power Supply
Signal-Detect Level Set: a resistor from this pin to V
CC
sets the
threshold for the data input amplitude at which SD will be asserted.
Device ground.
Signal-Detect: asserts high when the data input amplitude rises
above the threshold set by SD
LVL
.
2
3
4
5
6
7
DIN
/DIN
VREF
SDLVL
GND
SD
8
9
10
/DOUT
DOUT
VCC
Complementary data output.
True data output.
Positive power supply.
February 2007
3
M9999-021207-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88933AL
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
) .................................. 0V to +7.0V
Input Voltage (DIN, /DIN) ..................................0 to V
CC
Output Current (I
OUT
)
Continuous..................................................... 50mA
Surge ........................................................... 100mA
EN Voltage ........................................................0 to V
CC
V
REF
Current .................................... –800µA to +500µA
SD
LVL
Voltage ...............................................V
REF
to V
CC
Lead Temperature (soldering, 20sec.) ................ 260°C
Storage Temperature (T
s
) .................. –65°C to +150°C
Operating Ratings
(2)
Supply Voltage (V
CC
)............................+3.0V to +3.6V
Ambient Temperature (T
A
) ..................–40°C to +85°C
Junction Temperature (T
J
) ................–40°C to +120°C
Junction Thermal Resistance
MSOP (θ
JA
) Still-air ................................. 113°C/W
DC Electrical Characteristics
V
CC
= +3.0V to +3.6V; R
LOAD
= 50Ω to V
CC
–2V; T
A
= –40°C to +85°C; typical values at V
CC
= +3.3V, T
A
= +25
o
C.
Symbol
I
CC
SD
LVL
V
OH
V
OL
V
IHCMR
V
REF
Parameter
Power Supply Current
SD
LVL
Voltage
PECL Output HIGH Voltage
PECL Output LOW Voltage
Common Mode Range
Reference Voltage
Condition
No output load
V
REF
Min
Typ
26
Max
39
V
CC
Units
mA
V
V
V
V
V
V
CC
-1.085 V
CC
-0.955 V
CC
-0.880
V
CC
-1.850 V
CC
-1.705 V
CC
-1.555
GND+2.0
V
CC
V
CC
-1.48 V
CC
-1.32 V
CC
-1.16
TTL DC Electrical Characteristics
V
CC
= 3.0V to 3.6V; R
LOAD
= 50Ω to V
CC
-2V; T
A
= –40°C to +85°C.
Symbol
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
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 rating 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.
Parameter
EN Input HIGH Voltage
EN Input LOW Voltage
EN Input HIGH Current
EN Input HIGH Current
SD Output HIGH Level
SD Output LOW Level
Condition
Min
2.0
Typ
Max
0.8
Units
V
V
µA
µA
mA
V
V
V
IN
= 2.7V
V
IN
= V
CC
V
IN
= 0.5V
V
CC
> 3.3V, I
OH-MAX
< 160uA
V
CC
< 3.3V, I
OH-MAX
< 160uA
I
OL
= +2mA
-0.3
2.4
2.0
20
100
0.5
V
February 2007
4
M9999-021207-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc
SY88933AL
AC Electrical Characteristics
V
CC
= 3.0V to 3.6V; R
LOAD
= 50
Symbol
PSRR
t
r
, t
f
t
JITTER
V
ID
V
OD
T
OFF
T
ON
SD
AL
SD
DL
HYS
L
SD
AM
SD
DM
HYS
M
SD
AH
SD
DH
HYS
H
B
-3dB
A
V(Diff)
S
21
Notes:
3. Amplifier in limiting mode. Input is a 200MHz square wave.
4. Deterministic jitter measured using 1.25Gbps K28.5 pattern, V
ID
= 10mV
pp
.
5. Random jitter measured using 1.25Gbps K28.7 pattern, V
ID
= 10mV
pp
.
6. See “Typical Operating Characteristics” for a graph showing how to choose a particular R
SDLVL
for a particular SD assert and
its associated de-assert amplitude.
7. This specification defines electrical hysteresis as 20log (SD Assert/SD De-assert). The ratio between optical hysteresis and
electrical hysteresis is found to vary between 1.5 and 2 depending upon the level of received optical power and ROSA
characteristics. Based on that ratio, the optical hysteresis corresponding to the electrical hysteresis range 1dB-4.5 dB, shown
in the AC characteristics table, will be 0.5dB-3dB optical hysteresis
Parameter
Power Supply Rejection Ratio
Output Rise/Fall Time
(20% to 80%)
Deterministic
Random
Differential Input Voltage Swing
Differential Output Voltage Swing
SD Release Time
SD Assert Time
Low SD Assert Level
Low SD De-assert Level
Low SD Hysteresis
Medium SD Assert Level
Medium SD De-assert Level
Medium SD Hysteresis
High SD Assert Level
High SD De-assert Level
High SD Hysteresis
3dB Bandwidth
Differential Voltage Gain
Single-Ended Small-Signal Gain
30
R
SDLVL
= 15kΩ, Note 6
R
SDLVL
= 15kΩ, Note 6
R
SDLVL
= 15kΩ, Note 7
R
SDLVL
= 5kΩ, Note 6
R
SDLVL
= 5kΩ, Note 6
R
SDLVL
= 5kΩ, Note 7
R
SDLVL
= 100Ω, Note 6
R
SDLVL
= 100Ω, Note 6
R
SDLVL
= 100Ω, Note 7
8
2
3
2
1.0
1
Note 3
Note 4
Note 5
Figure 1
V
ID
> 18mV
pp
, Figure 1
5
1500
2
2
3.4
2.3
3.4
6.2
4.2
3.4
16.4
10.8
3.4
1
42
36
4.5
4.5
20
4.5
8
10
10
6.5
15
5
1800
to V
CC
–2V; T
A
= –40°C to +85°C; typical values at V
CC
= +3.3V, T
A
= +25
o
C.
Condition
Min
Typ
35
260
Max
Units
dB
ps
ps
pp
ps
RMS
mV
pp
mV
pp
µs
µs
mV
pp
mV
pp
dB
mV
pp
mV
pp
dB
mV
pp
mV
pp
dB
GHz
dB
dB
February 2007
5
M9999-021207-B
hbwhelp@micrel.com
or (408) 955-1690
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