SY88343BL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with High Gain TTL Loss-of-Signal
General Description
The SY88343BL low-power limiting post amplifier is
designed for use in fiber-optic receivers. The device
connects to typical transimpedance amplifiers (TIAs)
that are AC-coupled. The linear signal output from TIAs
can contain significant amounts of noise and may vary
in amplitude over time. The SY88343BL quantizes these
signals and outputs CML-level waveforms.
The SY88343BL 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, 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 SY88343BL generates a high-gain loss-of-signal
(LOS) open-collector TTL output. The LOS function has
a high gain input stage for increased 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 set 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.
Data sheet and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
Single 3.3V power supply
DC to 3.2Gbps operation
Low-noise CML data outputs
High gain LOS
Chatter-free Open-Collector TTL Loss-of-Signal
(LOS) output with internal 4.75kΩ pull-up resistor
TTL /EN input
Programmable LOS level set (LOS
LVL
)
Ideal for multi-rate applications
Available in a tiny 10-pin EPAD-MSOP and 16-pin
MLF™ package
Applications
•
•
•
•
•
APON, BPON, EPON, and GPON
Gigabit Ethernet
Fibre Channel
OC-3 and OC-12/24 SONET/SDH
High-gain line driver and line receiver
Markets
•
•
•
•
•
FTTP
Optical transceivers
Datacom/Telecom
Low-gain TIA interface
Long reach FOM
MLF and
MicroLeadFrame
are trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2005
M9999-101105-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88343BL
Typical Application
Pin Configuration
10-Pin EPAD-MSOP (K10-2)
16-Pin MLF
TM
(MLF-16)
Ordering Information
Part Number
SY88343BLEY
SY88343BLEYTR
(1)
SY88343BLMG
SY88343BLMGTR
(1)
Note:
1. Tape and Reel.
Package
Type
K10-2
K10-2
MLF-16
MLF-16
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package Marking
SY88343BL with Pb-Free bar line indicator
SY88343BL with Pb-Free bar line indicator
SY88343BL with Pb-Free bar line indicator
SY88343BL with Pb-Free bar line indicator
Lead
Finish
Matte-Sn
Matte-Sn
NiPdAu
Pb-Free
NiPdAu
Pb-Free
October 2005
2
M9999-101105-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88343BL
Pin Description
Pin Number
MSOP
1
2
3
4
5
Pin Number
MLF™
15
1
4
6
14
2, 3,
10, 11
Pin Name
Type
TTL Input: Default
is HIGH.
Data Input
Data Input
Pin Functioon
/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 logic HIGH state if left
open.
True data input.
Complementary data input.
Reference Voltage: Bypass with 0.01µF low ESR
capacitor from VREF to V
CC
to stabilize LOS
LVL
and V
REF
.
Input
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.
Device ground. GND and Exposed pad are to be tied to
the same ground plane.
Loss-of-Signal: asserts high when the data input
amplitude falls below the threshold set by LOS
LVL
.
Complementary data output.
True data output.
Positive power supply.
/EN
DIN
/DIN
VREF
LOSLVL
GND,
Exposed
Pad
LOS
/DOUT
DOUT
VCC
6
Ground
Open-collector
TTL output
w/internal 4.75kΩ
pull-down resistor
CML Output
CML Output
Power Supply
7
8
9
10
7
9
12
5, 8,
13, 16
October 2005
3
M9999-101105-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88343BL
Absolute Maximum Ratings
(1)
Supply Voltage (VCC) .................................. 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
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 +120°C
Junction Thermal Resistance
(3)
MLF
TM
.......................................................................
θ
JA
(Still-Air) ...............................................61
o
C/W
ψ
JB
..............................................................38
o
C/W
EPAD-MSOP
θ
JA
(Still-Air) ..............................................38
o
C/W
ψ
JB
.............................................................22
o
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; typical values at V
CC
= 3.3V, T
A
= 25
o
C.
Symbol
I
CC
V
LOSLVL
V
OH
V
OL
V
OFFSET
Z
O
Z
I
V
REF
V
IHCMR
Parameter
Power Supply Current
LOS
LVL
Voltage
CML Output HIGH Voltage
CML Output LOW Voltage
Differential Output Offset
Single-Ended Output
Impedance
Single-Ended Input Impedance
Reference Voltage
Input Common Mode Range
40
40
V
CC
-1.48
GND+2.0
50
50
V
CC
-1.32
Condition
No output load
V
REF
V
CC
-0.020 V
CC
-0.005
Min
Typ
45
Max
62
V
CC
V
CC
+80
60
60
V
CC
-1.16
V
CC
Units
mA
V
V
V
mV
Ω
Ω
V
V
V
CC
-0.475 V
CC
-0.400 V
CC
-0.350
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
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. 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
LOS Output HIGH Level
LOS 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
< 160µA
V
CC
< 3.3V, I
OH-MAX
< 160µA
I
OL
= +2mA
-0.3
2.4
2.0
20
100
0.5
V
October 2005
4
M9999-101105-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88343BL
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
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
3
Condition
Note 4
Note 5
Note 6
Figure 1
V
ID
> 18mV
PP
, Figure 1
5
700
800
2
2
3.1
4.8
3.8
5.2
7.5
3.2
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
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, 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
LOSLVL
for a particular LOS assert and
its associated de-assert amplitude.
October 2005
5
M9999-101105-A
hbwhelp@micrel.com
or (408) 955-1690
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