SY84403BL
Ultra Small 3.3V 4.25Gbps CML Low-Power
Limiting Post Amplifier with TTL LOS
General Description
The SY84403BL is the industry’s smallest limiting post
amplifier ideal for compact copper and fiber optic
module applications. 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
SY84403BL quantizes these signals and outputs
typically 800mV
PP
voltage-limited waveforms.
®
The SY84403BL comes in a tiny 10-pin 2x2 MLF
package, which is unparalleled in the industry. It offers
space savings of 55% or more over typical post amps.
It operates from a single +3.3V ±10% power supply,
over an industrial temperature range of –40°C to
+85°C. With its wide bandwidth and high gain, signals
with data rates up to 4.25Gbps and as small as
10mV
PP
can be amplified to drive devices with CML
inputs or AC-coupled PECL inputs.
The SY84403BL incorporates a loss-of-signal (LOS)
open-collector TTL output with internal 4.75kΩ pull-up
resistor. A programmable loss-of-signal level set pin
(LOSLVL) sets the sensitivity of the input amplitude
detection. LOS asserts high if the input amplitude falls
below the threshold set by LOSLVL and de-asserts
low otherwise. LOS can be fed back to the enable bar
(/EN) input to maintain output stability under a loss of
signal condition. /EN de-asserts the true output signal
without removing the input signal.
All support documentation can be found on Micrel’s
web site at: www.micrel.com.
Features
•
Available in an ultra small 10-pin (2mm x 2mm)
®
MLF package
•
Multi-rate up to 4.25Gbps operation
•
10mV
PP
input sensitivity
•
Low noise 50Ω
CML data outputs
– 800mV
PP
differential output swing
– 60ps edge rates
– 1ps
RMS
typ. random jitter
– 10ps
PP
typ. deterministic jitter
•
Chatter-free Loss-of-Signal (LOS) output
– 3.5dB electrical hysteresis
– OC-TTL output with internal 4.75kΩ
pull-up
resistor
•
Programmable LOS sensitivity using single
external resistor
•
Internal 50Ω
data input termination
•
TTL /EN input allows feedback from LOS
•
Wide operating range:
– Single 3.3V ±10% power supply
– Industrial temperature range: –40°C to +85°C
•
Part of Micrel’s new ultra small FOM IC family. For
Laser Diode Drivers, see SY84202L or SY84402L
Applications
•
1.062Gbps, 2.125Gbps and 4.25Gbps Fibre
Channel
•
Cable driver
•
SFF and SFP transceivers
•
High-gain line driver and line receiver
Typical Performance
Markets
•
Copper interconnect
•
Datacom and telecom
•
Storage area network (SAN)
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
May 2009
M9999-051509-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY84403BL
Typical Application
Functional Block Diagram
May 2009
2
M9999-051509-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY84403BL
Ordering Information
(1)
Part Number
SY84403BLMGTR
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC Electricals only.
Package
Type
MLF-10
Operating
Range
Industrial
Package
Marking
403 with
Pb-Free bar-line indicator
Lead
Finish
NiPdAu
Pb-Free
Pin Configuration
10-Pin MLF (MLF-10)
®
Pin Description
Pin Number
1, 2
3
4
Pin Name
DIN, /DIN
VREF
LOSLVL
Input: Default is
Maximum Sensitivity
Ground
TTL Output
Differential
CML Output
Power
Supply
TTL Input:
Default is high
Type
Differential
Data Input
Pin Function
Differential data input. Each pin internally terminates to REF through
50Ω.
Reference Voltage. Bypass with 0.01µF low ESR capacitor from V
REF
to V
CC
to stabilize LOS
LVL
and V
REF
.
Loss-of-Signal level set: A resistor from this pin to VCC sets the
threshold for the data input amplitude at which the LOS output will be
asserted.
Device ground. Exposed pad must be soldered (or equivalent) to the
same potential as the ground pin.
Loss-of-Signal: Asserts high when the data input amplitude falls below
the threshold set by LOSLVL. Contains Internal 4.75kΩ
pull-up
resistor
Differential data output.
Positive power supply. Bypass with 0.1µF||0.01µF low ESR capacitors.
0.01µF capacitors should be as close as possible to VCC pin.
Enable bar: De-asserts true data output when high. Incorporates
25kΩ
pull-up
to V
CC
.
5
6
8, 7
9
10
GND
Exposed Pad
LOS
DOUT, /DOUT
VCC
/EN
May 2009
3
M9999-051509-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY84403BL
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
) .....................................0V to 4.0V
/EN, LOSLVL Voltage........................................ 0 to V
CC
REF Current ......................................................... ±1mA
LOS Current ......................................................... ±5mA
DOUT, /DOUT Current ....................................... ±25mA
DIN, /DIN Current ............................................... ±10mA
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
A
) ..................–40°C to +125°C
(3)
Package Thermal Resistance
®
MLF
θ
JA
(Still-Air) ............................................ 93°C/W
ψ
JB
.......................................................... 56°C/W
DC Electrical Characteristics
V
CC
= +3.0V to +3.6V; T
A
= –40°C to +85°C; typical values at V
CC
= +3.3V, T
A
= 25°C.
Symbol
I
CC
V
REF
V
LOSLVL
V
OH
V
OL
V
OFFSET
Z
O
Z
I
Parameter
Power Supply Current
REF Voltage
LOSLVL Voltage Range
DOUT, /DOUT HIGH Voltage
DOUT, /DOUT LOW Voltage
Differential Output Offset
Single-Ended Output Impedance
Single-Ended Input Impedance
40
40
50
50
Note 6
V
CC
= 3.3V, Note 6
V
REF
V
CC
–0.020
V
CC
–0.475
V
CC
–0.005
V
CC
–0.400
Condition
Note 4
Note 5
Min
Typ
25
41
V
CC
–1.3
V
CC
V
CC
V
CC
–0.350
±80
60
60
Max
42
62
Units
mA
mA
V
V
V
V
mV
Ω
Ω
TTL DC Electrical Characteristics
V
CC
= +3.0V to +3.6V; T
A
= –40°C to +85°C.
Symbol
V
OH
V
OL
V
IH
V
IL
I
IH
I
IL
Notes:
1. Permanent device damage may occur if ratings in the absolute maximum ratings section are exceeded. This is a stress rating only and
functional operation is not implied for conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute
maximum ratings 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 are of 4-layer PCB. Exposed pad must be soldered (or equivalent) to the device's most negative potential on
the PCB.
4. Excludes current of CML output stage. See “Detailed Description.”
5. Total device current with no output load.
6. If the load impedance is different, the output level will be changed. Amplifier is in limiting mode.
Parameter
LOS Output HIGH Level
LOS Output LOW Level
/EN Input HIGH Voltage
/EN Input LOW Voltage
/EN Input HIGH Current
/EN Input LOW Current
Condition
Sourcing 100µA
Sinking 2mA
Min
2.4
2.0
Typ
Max
V
CC
0.5
0.8
Units
V
V
V
V
µA
µA
mA
V
IN
= 2.7V
V
IN
= V
CC
V
IN
= 0.5V
–0.3
20
100
May 2009
4
M9999-051509-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY84403BL
AC Electrical Characteristics
V
CC
= +3.0V to +3.6V; T
A
= –40°C to +85°C; R
L
= 50
Ω to V
CC
; typical values at V
CC
= +3.3V, T
A
= 25°C.
Symbol
t
r,
t
f
t
JITTER
V
ID
V
OD_AC
t
OFF
t
ON
LOS
AL
LOS
DL
HSY
L
LOS
AM
LOS
DM
HSY
M
LOS
AH
LOS
DH
HSY
H
V
SR
A
V(Diff)
S
21
Notes:
7. Amplifier in limiting mode. Input is a 200MHz square wave.
8. Deterministic jitter measured using 4.25Gbps K28.5 pattern, V
ID
= 20mV
PP
.
9. Random jitter measured using 4.25Gbps K28.7 pattern, V
ID
= 20mV
PP
.
10. Differential output swing measured at 4.25Gbps with 20mVpp input and PRBS-23 data pattern and 50Ω
load.
11. 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.
12. 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 on the level of received optical power and ROSA characteristics. Based on that
ratio, the optical hysteresis corresponding to the electrical hysteresis range 2dB-4.5 dB shown in the AC characteristics table will be 0.5dB-
3dB Optical Hysteresis.
Parameter
Output Rise/Fall Time
(20% to 80%)
Deterministic
Random
Differential Input Voltage Swing
AC Differential Output Voltage
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
LOS Sensitivity Range
Differential Voltage Gain
Single-Ended Small-Signal Gain
Condition
Note 7
Note 8
Note 9
See Figure 1
Note 10
Min
Typ
60
10
1
Max
120
Units
ps
ps
PP
ps
RMS
10
600
800
2
2
1800
950
10
10
mV
pp
mV
pp
µs
µs
mV
PP
mV
PP
R
LOSLVL
= 15kΩ, Note 11
R
LOSLVL
= 15kΩ, Note 11
R
LOSLVL
= 15kΩ, Note 12
R
LOSLVL
= 5kΩ, Note 11
R
LOSLVL
= 5kΩ, Note 11
R
LOSLVL
= 5kΩ, Note 12
R
LOSLVL
= 100Ω, Note 11
R
LOSLVL
= 100Ω, Note 11
R
LOSLVL
= 100Ω, Note 12
2
10
32
26
2
34
2
12
8
12
3.5
17
25
3.5
47
70
3.5
38
32
83
4.5
35
33
4.5
4.5
dB
mV
PP
mV
PP
dB
mV
PP
mV
PP
dB
mV
PP
dB
dB
May 2009
5
M9999-051509-A
hbwhelp@micrel.com
or (408) 955-1690
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