SY88343BL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with High Gain TTL Loss-of-Signal
MLF and
Micro
LeadFrame 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
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 4.75k 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
MLFTM 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
Micrel, Inc.
SY88343BL
October 2005
2
M9999-101105-A
hbwhelp@micrel.com
or (408) 955-1690
Typical Application
Pin Configuration
10-Pin EPAD-MSOP (K10-2)
16-Pin MLF
TM
(MLF-16)
Ordering Information
Part Number
Package
Type
Operating
Range
Package Marking
Lead
Finish
SY88343BLEY
K10-2
Industrial
SY88343BL with Pb-Free bar line indicator
Matte-Sn
SY88343BLEYTR
(1)
K10-2
Industrial
SY88343BL with Pb-Free bar line indicator
Matte-Sn
SY88343BLMG
MLF-16
Industrial
SY88343BL with Pb-Free bar line indicator
NiPdAu
Pb-Free
SY88343BLMGTR
(1)
MLF-16
Industrial
SY88343BL with Pb-Free bar line indicator
NiPdAu
Pb-Free
Note:
1. Tape and Reel.
Micrel, Inc.
SY88343BL
October 2005
3
M9999-101105-A
hbwhelp@micrel.com
or (408) 955-1690
Pin Description
Pin Number
MSOP
Pin Number
MLFTM
Pin Name
Type
Pin Functioon
1 15
/EN
TTL Input: Default
is HIGH.
/Enable: This input enables the outputs when it is LOW.
Note that this input is internally connected to a 25k pull-
up resistor and will default to logic HIGH state if left
open.
2
1
DIN
Data Input
True data input.
3
4
/DIN
Data Input
Complementary data input.
4 6
VREF
Reference Voltage: Bypass with 0.01F low ESR
capacitor from VREF to V
CC
to stabilize LOS
LVL
and V
REF
.
5 14
LOSLVL
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.
6
2, 3,
10, 11
GND,
Exposed
Pad
Ground
Device ground. GND and Exposed pad are to be tied to
the same ground plane.
7 7
LOS
Open-collector
TTL output
w/internal 4.75k
pull-down resistor
Loss-of-Signal: asserts high when the data input
amplitude falls below the threshold set by LOS
LVL
.
8
9
/DOUT
CML Output
Complementary data output.
9
12
DOUT
CML Output
True data output.
10
5, 8,
13, 16
VCC
Power Supply
Positive power supply.
Micrel, Inc.
SY88343BL
October 2005
4
M9999-101105-A
hbwhelp@micrel.com
or (408) 955-1690
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 .......................................-800A to +500A
LOS
LVL
Voltage.............................................. V
REF
to V
CC
Lead Temperature (soldering, 20sec.) .................. 260C
Storage Temperature (T
s
) .....................-65C to +150C
Operating Ratings
(2)
Supply Voltage (V
CC
)............................+3.0V to +3.6V
Ambient Temperature (T
A
) ..................40C to +85C
Junction Temperature (T
J
) ................40C to +120C
Junction Thermal Resistance
(3)
MLF
TM
.......................................................................
JA
(Still-Air) ...............................................61
o
C/W
JB
..............................................................38
o
C/W
EPAD-MSOP
JA
(Still-Air) ..............................................38
o
C/W
JB
.............................................................22
o
C/W
DC Electrical Characteristics
V
CC
= 3.0V to 3.6V; R
L
= 50 to V
CC
; T
A
= 40C to +85C; typical values at V
CC
= 3.3V, T
A
= 25
o
C.
Symbol Parameter
Condition
Min
Typ
Max Units
I
CC
Power Supply Current
No output load
45
62
mA
V
LOSLVL
LOS
LVL
Voltage
V
REF
V
CC
V
V
OH
CML Output HIGH Voltage
V
CC
-0.020 V
CC
-0.005 V
CC
V
V
OL
CML Output LOW Voltage
V
CC
-0.475 V
CC
-0.400 V
CC
-0.350
V
V
OFFSET
Differential Output Offset
+80 mV
Z
O
Single-Ended Output
Impedance
40
50
60
Z
I
Single-Ended Input Impedance
40
50
60
V
REF
Reference
Voltage
V
CC
-1.48 V
CC
-1.32 V
CC
-1.16
V
V
IHCMR
Input Common Mode Range
GND+2.0
V
CC
V
TTL DC Electrical Characteristics
V
CC
= 3.0V to 3.6V; T
A
= 40C to +85C.
Symbol Parameter
Condition
Min
Typ
Max Units
V
IH
/EN Input HIGH Voltage
2.0
V
V
IL
/EN Input LOW Voltage
0.8
V
I
IH
/EN Input HIGH Current
V
IN
= 2.7V
V
IN
= V
CC
20
100
A
A
I
IL
/EN Input LOW Current
V
IN
= 0.5V
-0.3
mA
V
OH
LOS Output HIGH Level
V
CC
> 3.3V, I
OH-MAX
< 160A
V
CC
< 3.3V, I
OH-MAX
< 160A
2.4
2.0
V
V
V
OL
LOS Output LOW Level
I
OL
= +2mA
0.5
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 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.
Micrel, Inc.
SY88343BL
October 2005
5
M9999-101105-A
hbwhelp@micrel.com
or (408) 955-1690
AC Electrical Characteristics
V
CC
= 3.0V to 3.6V; R
L
= 50 to V
CC
; T
A
= 40C to +85C.
Symbol Parameter
Condition
Min
Typ Max Units
t
r
, t
f
Output Rise/Fall Time
(20% to 80%)
Note 4
60
120
ps
t
JITTER
Deterministic
Random
Note 5
Note 6
15
5
ps
PP
ps
RMS
V
ID
Differential Input Voltage Swing
Figure 1
5
1800
mV
PP
V
OD
Differential Output Voltage Swing
V
ID
> 18mV
PP
, Figure 1
700 800
950 mV
PP
T
OFF
LOS
Release
Time
2 10
s
T
ON
LOS
Assert
Time
2 10
s
LOS
AL
Low LOS Assert Level
R
LOSLVL
= 15k, Note 8
3.1
mV
PP
LOS
DL
Low LOS De-assert Level
R
LOSLVL
= 15k, Note 8
4.8
mV
PP
HYS
L
Low LOS Hysteresis
R
LOSLVL
= 15k, Note 7
3.8
dB
LOS
AM
Medium LOS Assert Level
R
LOSLVL
= 5k, Note 8
3
5.2
mV
PP
LOS
DM
Medium LOS De-assert Level
R
LOSLVL
= 5k, Note 8
7.5
11
mV
PP
HYS
M
Medium
LOS
Hysteresis
R
LOSLVL
= 5k, Note 7
2
3.2
4.5
dB
LOS
AH
High LOS Assert Level
R
LOSLVL
= 100, Note 8
8
12
mV
PP
LOS
DH
High LOS De-assert Level
R
LOSLVL
= 100, Note 8
18
23
mV
PP
HYS
H
High LOS Hysteresis
R
LOSLVL
= 100, Note 7
2
3.5
4.5
dB
B
-3dB
3dB
Bandwidth
2 GHz
A
V(Diff)
Differential Voltage Gain
32
38
dB
S
21
Single-ended Small-Signal Gain
26
32
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.
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