SY88289CL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with High-Gain TTL Loss-of-Signal
General Description
The SY88289CL low-power, 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 SY88289CL quantizes these
signals and outputs CML-level waveforms.
The SY88289CL operates from a single +3.3V power
o
o
supply, over temperatures ranging from –40 C to +85 C.
With its wide bandwidth and high gain, signals with data
rates up to 3.2Gbps and as small as 5mV
PP
can be
amplified to drive devices with CML inputs or AC-
coupled CML/PECL inputs.
The SY88289CL generates a high-gain loss-of-signal
(LOS) open-collector TTL output. This function has a
high-gain input stage for increased LOS sensitivity. A
programmable loss-of-signal level-set pin (LOS
LVL
) sets
the sensitivity of the input amplitude detection. LOS
asserts high if the input amplitude falls below the
threshold sets by LOS
LVL
and de-asserts low otherwise.
The enable bar input (/EN) de-asserts the true output
signal without removing the input signal. The LOS
output can be fed back to the /EN input to maintain
output stability under a loss-of-signal condition.
Typically, 3.5dB LOS 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
125Mbps to 3.2Gbps operation
Low-noise CML data outputs
High-gain LOS
Chatter-free open-collector TTL Loss-of-Signal (LOS)
output with an internal 4.75kΩ
pull
-up resistor
TTL /EN input
Programmable LOS level set (LOS
LVL
)
Ideal for multi-rate applications
Available in a tiny (3mm x 3mm) 16-pin QFN
package
APON, BPON, EPON, GEPON and GPON
Gigabit Ethernet
1X and 2X Fibre Channel
SONET/SDH : OC 3/12/24/48 – STM 1/4/8/16
High-gain line driver and line receiver
Low-gain TIA interface
FTTP/FTTH
Optical transceivers
Datacom/Telecom
Long reach FOM
Applications
•
•
•
•
•
•
•
•
•
•
Markets
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.
SY88289CL
Typical Application
Ordering Information
Part Number
SY88289CLMG
SY88289CLMGTR
Note:
1. Tape and Reel.
(1)
Package Type
QFN-16
QFN-16
Operating Range
Industrial
Industrial
Package Marking
289C with Pb-Free bar line indicator
289C with Pb-Free bar line indicator
Lead Finish
NiPdAu
Pb-Free
NiPdAu
Pb-Free
Pin Configuration
16-Pin QFN
February 2007
2
M9999-021207-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88289CL
Pin Description
Pin Number
1, 12
2
3
4, 9
5
6
Pin Name
VCC
DIN
/DIN
GND
VREF
LOSLVL
Input
Type
Power Supply
Data Input
Data Input
Ground
Positive power supply.
True data input.
Complementary data input.
Device ground.
Reference voltage: Placing a capacitor here to VCC helps
stabilize LOS
LVL
.
Loss-of-signal Level Set: a resistor from this pin to V
CC
sets
the threshold for the data input amplitude at which LOS will be
asserted.
No connect.
Open-collector TTL
output w/internal 4.75kΩ
pull-up resistor
CML Output
CML Output
TTL Input: Default is
HIGH.
Loss-of-signal: asserts high when the data input amplitude
falls below the threshold sets by LOS
LVL
.
Complementary data output.
True data output.
/Enable: This input enables the outputs when it is LOW. Note
that this input is internally connected to a 25kΩ pull-up resistor
and will default to a logic HIGH state if left open.
Pin Function
7, 14, 15, 16
8
N/C
LOS
10
11
13
/DOUT
DOUT
/EN
February 2007
3
M9999-021207-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88289CL
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
) .................................... 0V to +4.0V
Input Voltage (DIN, /DIN) ................................... 0 to V
CC
Output Current (I
OUT
)
Continuous……………………………………±25mA
/EN Voltage ........................................................ 0 to V
CC
V
REF
Current……………………………-800uA to +500uA
LOS
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 +125°C
Junction Thermal Resistance
QFN (θ
JA
)
Still-air ..................................................... 61°C/W
QFN (Ψ
JB
)
o
Junction-to-board .....................................38 C/W
DC Electrical Characteristics
V
CC
= 3.0V to 3.6V; R
L
= 50Ω
to V
CC
; T
A
= –40°C to +85°C.
Symbol
I
CC
LOS
LVL
V
OH
V
OL
V
OFFSET
V
REF
V
IHCMR
Parameter
Power Supply Current
LOS
LVL
Voltage
CML Output HIGH Voltage
CML Output LOW Voltage
Differential Output Offset
Reference Voltage
Input Common Mode Range
GND+2.0
V
CC
-1.28
V
CC
V
CC
= 3.3V
Condition
No output load
V
REF
V
CC
-0.020
V
CC
-0.475
V
CC
-0.005
V
CC
-0.400
Min
Typ
42
Max
62
V
CC
V
CC
V
CC
-0.350
±80
Units
mA
V
V
V
mV
V
V
TTL DC Electrical Characteristics
V
CC
= 3.0V to 3.6V; R
L
= 50Ω
to V
CC
; 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.
3. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential (GND)
on the PCB.
Ψ
JB
uses 4-layer (θ
JA
) in still-air-number, unless otherwise stated.
Parameter
/EN Input HIGH Voltage
/EN Input LOW Voltage
/EN Input HIGH Current
/EN Input LOW Current
LOS Output High Level
LOS Output LOW Level
V
IN
= 2.7V
V
IN
= V
CC
V
IN
= 0.5V
Vout
≥ 3.3V, I
OH (MAX)
< 160 uA
Vout < 3.3V, I
OH (MAX)
< 160 uA
Sinking 2mA
-300
2.4
2.0
0.5
Condition
Min
2.0
0.8
20
100
V
µA
µA
uA
V
V
V
Typ
Max
Units
February 2007
4
M9999-021207-B
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88289CL
AC Electrical Characteristics
V
CC
= 3.0V to 3.6V; R
L
= 50Ω
to V
CC
; T
A
= –40°C to +85°C.
Symbol
t
r
, t
f
t
JITTER
V
ID
V
OD
T
OFF
T
ON
LOS
AL
LOS
DL
HYS
L
LOS
AM
LOS
DM
HYS
M
LOS
AH
LOS
DH
HYS
H
B
-3dB
A
V(Diff)
S
21
Notes:
4. Amplifier in limiting mode. Input is a 200MHz square wave.
5. Deterministic jitter measured using 3.2Gbps K28.5 pattern, V
ID
= 10mV
PP
.
6. Random jitter measured using 3.2Gbps K28.7 pattern, V
ID
= 10mV
PP
.
7. This specification defines electrical hysteresis as 20log (LOS De-assert/LOS 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 upon that ratio, the optical hysteresis corresponding to the electrical hysteresis range 2dB-4.5dB, as
shown in the AC characteristics table, will be 1dB-3dB.
8. See “Typical Operating Characteristics” for a graph showing how to choose a particular R
LOSLVL
for a particular LOS assert and
its associated de-assert amplitude.
Parameter
Output Rise/Fall Time
(20% to 80%)
Deterministic
Random
Differential Input Voltage Swing
Differential Output Voltage Swing
LOS Release Time
LOS Assert Time
Low LOS Assert Level
Low LOS De-assert Level
Low LOS Hysteresis
Medium LOS Assert Level
Medium LOS De-assert Level
Medium LOS Hysteresis
High LOS Assert Level
High LOS De-assert Level
High LOS Hysteresis
3dB Bandwidth
Differential Voltage Gain
Single-ended Small-Signal Gain
32
26
R
LOSLVL
= 15kΩ,
Note 8
R
LOSLVL
= 15kΩ,
Note 8
R
LOSLVL
= 15kΩ,
Note 7
R
LOSLVL
= 5kΩ,
Note 8
R
LOSLVL
= 5kΩ,
Note 8
R
LOSLVL
= 5kΩ,
Note 7
R
LOSLVL
= 100Ω,
Note 8
R
LOSLVL
= 100Ω,
Note 8
R
LOSLVL
= 100Ω,
Note 7
2
2
8
2
Condition
Note 4
Note 5
Note 6
Figure 1
V
ID
> 12mV
PP
, Figure 1
5
700
800
2
2
3
4.5
3.5
5
7.5
3.5
12
18
3.5
2
38
32
23
4.5
11
4.5
Min
Typ
60
15
5
1800
950
10
10
Max
120
Units
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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