SY88309BL
3.3V, 3.2Gbps PECL Limiting Post Amplifier
with Wide Signal-Detect Range
General Description
The SY88309BL low-power limiting post amplifiers are
designed for use in fiber-optic receivers. These devices
connect 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 SY88309BL quantizes these signals and output
PECL-level waveforms.
The SY88309BL operates from a single +3.3V power
supply, over temperatures ranging from –40
o
C to +85
o
C.
With their wide bandwidth and high gain, signals with
data rates up to 3.2Gbps, and as small as 10mVpp, can
be amplified to drive devices with CML or PECL inputs.
It generates a Signal Detect (SD) open-collector TTL
output. The SD function is optimized to detect a larger
and wider input range, as shown in the characteristic
curve on page 6. 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 sets by SD
LVL
and de-asserts low otherwise.
The SD output can be fed back to the EN input to
maintain stability. Typically, 3.5dB LOS/SD hysteresis is
provided to prevent chattering.
Datasheet and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
Signal Detect circuit optimized to detect a larger and
wider input range (20mV
PP
-140mV
PP
)
•
Chatter-free Open-Collector TTL Signal-Detect (SD)
•
Single 3.3V power supply
•
155Mbps to 3.2Gbps operation
•
Low-noise PECL data outputs
•
Programmable SD level set (SD
LVL
)
•
Available in a tiny 10-pin EPAD-MSOP and 16-pin
QFN package
Applications
•
•
•
•
•
PON
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
Markets
•
•
•
•
•
FTTX
Optical transceivers
Datacom/Telecom
Low-gain TIA interface
Long-reach FOM
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2007
M9999-111507-C
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88309BL
Typical Application
Pin Configuration
10-Pin EPAD-MSOP (K10-2)
16-Pin QFN
Ordering Information
Part Number
SY88309BLEY
SY88309BLEYTR
(1)
SY88309BLMG
SY88309BLMGTR
(1)
Note:
1. Tape and Reel.
Package
Type
K10-2
K10-2
QFN-16
QFN-16
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package Marking
309B with Pb-Free bar line indicator
309B with Pb-Free bar line indicator
309B with Pb-Free bar line indicator
309B with Pb-Free bar line indicator
Lead
Finish
Matte-Sn
Pb-free
Matte-Sn
Pb-free
NiPdAu
Pb-free
NiPdAu
Pb-free
November 2007
2
M9999-111507-C
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88309BL
Pin Description
Pin Number
(MSOP)
1
2
3
4
5
6
Exposed Pad
7
8
9
10
Pin Number
(QFN)
15
1
4
6
14
2, 3, 10, 11
Exposed Pad
7
9
12
5, 8, 13, 16
Pin Name
EN
DIN
/DIN
VREF
SDLVL
GND
Input
Ground
Open Collector
TTL Output
PECL Output
PECL Output
Power supply
Type
TTL Input: Default is
high.
Data Input
Data Input
Pin Function
Enable: De-asserts true data output when LOW.
True data input with 50Ω termination to V
REF
.
Complementary data input with 50Ω termination to
V
REF
.
Reference Voltage: Placing a capacitor here to V
CC
helps stabilize SD
LVL
.
Signal-detect Level Set: A resistor from this pin to
V
CC
sets the threshold for the data input amplitude
at which the SD output will be asserted.
Device ground. Exposed pad must be connected to
PCB ground plane.
Signal-detect: Asserts high when the data input
amplitude rises above the threshold sets by SD
LVL
.
For proper operation, install an external 4.75kΩ
pull-up resistor at this output.
Complementary data output.
True data output.
Positive power supply.
SD
/DOUT
DOUT
VCC
November 2007
3
M9999-111507-C
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88309BL
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.....................................................+50mA
Surge ...........................................................+100mA
/EN Voltage ........................................................ 0 to V
CC
V
REF
Current .......................................-800µA to +500µA
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
(3)
EPAD-MSOP
θ
JA
(Still-Air) .............................................. 38
o
C/W
ψ
JB
............................................................ 22
o
C/W
QFN
θ
JA
(Still-Air) .............................................. 61
o
C/W
ψ
JB
............................................................ 38
o
C/W
DC Electrical Characteristics
V
CC
= 3.0V to 3.6V; R
L
= 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
V
SDLVL
V
OH
V
OL
V
OFFSET
V
REF
Z
I
Parameter
Power Supply Current
SD
LVL
Voltage
PECL Output HIGH Voltage
PECL Output LOW Voltage
Differential Output Offset
Reference Voltage
Single-Ended Input Impedance
V
CC
-1.48
40
V
CC
-1.32
50
Condition
No output load
V
REF
Min
Typ
38
Max
60
V
CC
Units
mA
V
V
V
mV
V
Ω
V
CC
-1.085 V
CC
-0.955 V
CC
-0.880
V
CC
-1.830 V
CC
-1.705 V
CC
-1.555
+160
V
CC
-1.16
60
TTL DC Electrical Characteristics
V
CC
= 3.0V to 3.6V; T
A
= –40°C to +85°C.
Symbol
V
IH
V
IL
I
IH
I
IL
I
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. Thermal performance assumes the use of a 4-layer PCB. Exposed pad must be soldered (or equivalent) to the device’s most negative
potential on the PCB.
Parameter
EN Input HIGH Voltage
EN Input LOW Voltage
EN Input HIGH Current
EN Input LOW Current
SD Output Leakage
SD Output LOW Level
Condition
Min
2.0
Typ
Max
0.8
Units
V
V
µA
µA
µA
µA
V
V
IN
= 2.7V
V
IN
= V
CC
V
IN
= 0.5V
V
OH
= 3.6V
I
OL
= +4mA
-300
20
100
100
0.5
November 2007
4
M9999-111507-C
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88309BL
AC Electrical Characteristics
V
CC
= 3.0V to 3.6V; R
L
= 50Ω to V
CC
-2V; T
A
= –40°C to +85°C; typical values at V
CC
= 3.3V, T
A
= +25°C.
Symbol
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
Parameter
Output Rise/Fall Time
(20% to 80%)
Deterministic
Random
Differential Input Voltage Swing
Differential Output Voltage Swing
SD Assert Time
SD De-assert Time
Low SD Assert Level
Low SD De-assert Level
Low SD/LOS Hysteresis
Medium SD Assert Level
Medium SD De-assert Level
Medium SD/LOS Hysteresis
High SD Assert Level
High SD De-assert Level
High SD/LOS Hysteresis
3dB Bandwidth
Differential Voltage Gain
Single-ended Small-Signal Gain
30
R
SDLVL
= 15kΩ, Note 8
R
SDLVL
= 15kΩ, Note 8
R
SDLVL
= 15kΩ, Note 7
R
SDLVL
= 5kΩ, Note 8
R
SDLVL
= 5kΩ, Note 8
R
SDLVL
= 5kΩ, Note 7
R
SDLVL
= 100Ω, Note 8
R
SDLVL
= 100Ω, Note 8
R
SDLVL
= 100Ω, Note 7
70
2
21
2
Condition
Note 4
Note 5
Note 6
Figure 1
V
ID
> 12mV
PP
, Figure 1
5
1500
2
2
27
18
3.4
53
36
3.5
137
94
3.5
1.8
42
36
6
6
200
80
10
10
15
5
1800
Min
Typ
Max
150
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
Notes:
4. Amplifier in limiting mode. Input is a 200MHz, 100mVpp 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-6dB, shown in the AC characteristics table, will be 1dB-3dB
Optical Hysteresis.
8. 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.
November 2007
5
M9999-111507-C
hbwhelp@micrel.com
or (408) 955-1690
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