Micrel, Inc.
5V/3.3V 1.25Gbps HIGH-SPEED
LIMITING POST AMPLIFIER
DESCRIPTION
SY88913V
SY88913V
FEATURES
■
■
■
■
■
■
3.3V and 5V power supply options
Up to 1.5Gbps operation
Low power
Low noise
Chatter-Free /LOS Generation
PECL /LOS Output
■
TTL /EN Input
■
Differential PECL inputs for data
■
/EN input is TTL with internal 27K pull up
■
Single power supply
■
Designed for use with Micrel-Synergy laser diode
driver and controller
■
Available in a tiny 10-pin (3mm) MSOP
The SY88913V limiting post amplifier with its high gain
and wide bandwidth is ideal for use as a post amplifier in
fiber-optic receivers with data rates up to 1.5Gbps. Signals
as small as 5mVp-p can be amplified to drive devices with
PECL inputs. The SY88913V generates a chatter-free PECL
Loss of Signal (/LOS) output.
The SY88913V incorporates a programmble level detect
function to identify when the input signal has been lost. This
information can be fed back to the /EN input of the device
to maintain stability under loss of signal conditions. Using
LOS
LVL
pin the sensitivity of the level detect can be adjusted.
The LOS
LVL
voltage can be set by connecting a resistor
divider between V
CC
and V
REF
, Figure 2. Figure 3 and 4
show the relationship between input level sensitivity and the
voltage set on LOS
LVL
.
APPLICATIONS
■
■
■
■
1.25Gbps Gigabit Ethernet
531Mbps and 1062Mbps Fibre Channel
622Mbps SONET
Gigabit Interface Converter
BLOCK DIAGRAM
M9999-071310
hbwhelp@micrel.com or (408) 955-1690
1
Rev.: D
Amendment: /0
Issue Date: July 2010
Micrel, Inc.
SY88913V
PACKAGE/ORDERING INFORMATION
Ordering Information
Part Number
SY88913VKC
SY88913VKCTR
(1)
SY88913VKG
Package
Type
K10-1
K10-1
K10-1
K10-1
Operating
Range
Commercial
Commercial
Industrial
Industrial
Package
Marking
913V
913V
913V with
Pb-Free bar-line indicator
913V with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
Pb-Free
NiPdAu
Pb-Free
NiPdAu
16-Pin MSOP (K10-1)
SY88913VKGTR
(1)
Note:
1. Tape and Reel.
PIN NAMES
Pin
D
IN
/D
IN
LOS
LVL
/EN
/LOS
GND
D
OUT
/D
OUT
V
CC
V
REF
Type
Data Input
Data Input
Input
TTL Input
PECL Output
Ground
PECL Output
PECL Output
Power Supply
Output
Function
Data Input
Inverting Data Input
Loss of Signal Level Set
Output Enable (active Low)
Loss of Signal Indicator
(active Low)
Ground
Data Output
Inverting Data Output
Positive Power Supply
Reference Voltage Output
for LOS Level Set (see Fig. 2)
GENERAL DESCRIPTION
General
The SY88913V is an integrated limiting amplifier
intended for high-frequency fiber-optic applications. The
circuit connects to typical transimpedance amplifiers found
within a fiber-optics link. The linear signal output from a
transimpedance amplifier can contain significant amounts of
noise, and may vary in amplitude over time. The SY88913V
limiting amplifier quantizes the signal and outputs a voltage-
limited waveform.
The TTL /EN pin allows the user to disable the signal
without removing the input signal.
M9999-071310
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
SY88913V
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
D
IN
, /D
IN
LOS
LVL
V
REF
T
A
T
store
T
JUNCTION
D
OUT
, /D
OUT
, /LOS
Input Voltage
Output Voltage (with 50Ω load)
Input Voltage
Output Voltage
Operating Temperature Range
Storage Temperature Range
Max Junction Temperature
Rating
Power Supply Voltage
Value
0 to +7.0
0 to V
CC
V
CC
–2.5 to V
CC
+0.3
0 to V
CC
V
CC
–2.0 to V
CC
–40 to +85
–55 to +125
125
Unit
V
V
V
V
V
°C
°C
°C
Note:
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 ratlng conditions for extended
periods may affect device reliability.
V
CC
= +3.3V ±10% or +5V ±10%, R
LOAD
= 50Ω to V
CC
–2V
T
A
= –40°C
Symbol
I
CC
I
IL
I
IH
V
CMR
V
offset
LOS
LVL
V
OH
V
OL
V
REF
V
IH
V
IL
Parameter
Power Supply
Current
(1)
5V
3.3V
Min.
—
—
–0.3
(5)
—
—
—
V
REF
V
CC
–1085
DC ELECTRICAL CHARACTERISTICS
T
A
= 0°C
Min.
—
—
–0.3
(5)
—
—
—
V
REF
V
CC
–1025
T
A
= +25°C
Min.
—
—
–0.3
(5)
—
—
—
V
REF
V
CC
–1025
T
A
= +85°C
Max.
35
35
—
20
(2)
100
(3)
±160
V
CC
V
CC
–880
Max.
35
35
—
20
(2)
100
(3)
±160
V
CC
V
CC
–880
Max.
35
35
—
20
(2)
100
(3)
±160
V
CC
V
CC
–880
Typ.
21
23
—
—
—
—
±40
—
V
CC
–955
Min.
—
—
–0.3
(5)
—
—
—
V
REF
V
CC
–1025
Max.
40
40
—
20
(2)
100
(3)
±160
V
CC
V
CC
–880
V
CC
–1620
V
CC
–1.26
Unit
mA
mA
µA
V
mV
V
mV
mV
V
V
V
/EN Input LOW Current
/EN Input HIGH Current
Common Mode Range
LOS
LVL
Level
D
OUT
and /D
OUT
HIGH Output
D
OUT
and /D
OUT
LOW Output
Reference Supply
(4)
/EN Input HIGH Voltage
/EN Input LOW Voltage
GND +2.0 V
CC
–1.0 GND +2.0 V
CC
–1.0 GND +2.0
V
CC
–1.0 GND +2.0 V
CC
–1.0
Differential Output Offset
V
CC
–1830
V
CC
–1.38
V
CC
–1555 V
CC
–1810 V
CC
–1620
V
CC
–1.26
V
CC
–1.38
V
CC
–1.26
V
CC
–1810
V
CC
–1.38
V
CC
–1705 V
CC
–1620
V
CC
–1.32 V
CC
–1.26
V
CC
–1810
V
CC
–1.38
2.0
—
—
0.8
2.0
—
—
0.8
2.0
—
—
—
—
0.8
2.0
—
—
0.8
Notes:
1. No Output Load.
2. V
IN
= 2.7V.
3. V
IN
= V
CC
.
4. I
REF
must be limited to be within –0.8mA (source) and 0.5mA (sink).
5. V
IN
= 0.5V.
M9999-071310
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SY88913V
AC ELECTRICAL CHARACTERISTICS
V
CC
= +3.3V ±10% or +5V ±10%, R
LOAD
= 50Ω to V
CC
–2V.
T
A
= –40°C
Symbol
PSRR
V
ID
V
OD
t
OFFL
t
ONL
t
OFFH
V
SR
HYS
t
r
, t
f
Parameter
Power Supply
(1)
Rejection Ratio
Input Voltage Range
Differential Output
Voltage Swing
(2)
/LOS Release Time
(3)
Minimum Input
/LOS Assert Time
(3)
/LOS Release Time
(4)
Maximum Input
/LOS Sensitivity Range
/LOS Hysteresis
Output Rise/Fall Time
Min.
—
5
—
200
—
—
—
5
2
—
—
Max.
—
1800
—
—
0.5
0.5
0.5
50
8
260
—
T
A
= 0°C
Min.
—
5
—
200
—
—
—
5
2
—
—
Max.
—
1800
—
—
0.5
0.5
0.5
50
8
260
—
—
5
—
200
—
—
—
5
2
—
—
T
A
= +25°C
Min.
Typ.
35
—
700
250
0.1
0.2
0.1
—
4.6
170
t
rin
,t
fin
Max.
—
1800
—
—
0.5
0.5
0.5
50
8
260
—
T
A
= +85°C
Min.
—
5
—
200
—
—
—
5
2
—
—
Max.
—
1800
—
—
0.5
0.5
0.5
50
8
260
—
Unit
dB
mV
PP
mV
mV
µs
µs
µs
mV
PP
dB
ps
V
ID
> 100mV
PP
V
ID
< 100mV
PP
V
ID
= 15mV
PP
V
ID
= 5mV
PP
Conditions
Input referred,
55MHz
Notes:
1. Input referred noise = RMS output noise/low frequency gain.
2. Input is 622MHz square wave.
3. Input is a 200MHz square wave, tr < 300ps, 8mV
PP
.
4. Input is a 200MHz square wave, tr < 300ps, 1.8V
PP
.
M9999-071310
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
SY88913V
APPLICATION NOTE
Output Termination
The SY88913V ground pin should be connected to the
The SY88913V outputs must be terminated with a 50Ω circuit board ground. Use multiple PCB vias close to the part
to connect to ground. Avoid long, inductive runs which can
load to V
CC
–2V (or Thevenin equivalent).
degrade performance.
Layout and PCB Design
Since the SY88913V is a high-frequency component,
performance can largely be determined by board layout
and design. A common problem with high-gain amplifiers
is feedback from the large swing outputs to the input via the
power supply.
Figure 1. Differential Input Configuration
Figure 2. LOS
LVL
Circuit
Notes:
LOS
LVL
= V
CC
–1.32 +
R2
×
1.32
R1 + R2
R1 + R2 ≥ 5kΩ
M9999-071310
hbwhelp@micrel.com or (408) 955-1690
5
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