Micrel, Inc.
3.3V/5V 3.2Gbps CML LOW-POWER
LIMITING POST AMPLIFIER w/TTL SD
SY88843V
SY88843V
FEATURES
s
Multi-rate up to 3.2Gbps operation
s
Wide gain-bandwidth product
•
38dB differential gain
•
2GHz 3dB bandwidth
s
Low noise 50
Ω
CML data outputs
•
800mV
PP
output swing
•
60ps edge rates
•
5ps
RMS
typ. random jitter
•
15ps
PP
typ. deterministic jitter
s
Chatter-free, Signal-Detect (SD) output
•
4.6dB electrical hysteresis
•
OC-TTL output with internal 4.75k
Ω
pull-up
resistor
s
Programmable SD sensitivity using single external
resistor
s
Internal 50
Ω
data input termination
s
TTL EN input allows feedback from SD
s
Wide operating range
•
Single 3.3V
±
10% or 5V
±
10% power supply
•
–40
°
C to +85
°
C industrial temperature range
s
Available in tiny 10-pin EPAD-MSOP and
16-pin MLF™ packages
DESCRIPTION
The SY88843V low-power limiting post amplifier is
designed for use in fiber-optic receivers. 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 SY88843V
quantizes these signals and outputs typically 800mV
PP
voltage-limited waveforms.
The SY88843V operates from a single +3.3V
±10%
or
+5V
±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 3.2Gbps and as small as
10mVp-p can be amplified to drive devices with CML inputs
or AC-coupled PECL inputs.
The SY88843V incorporates a signal detect (SD), open-
collector TTL output with internal 4.75kΩ pull-up resistor. A
programmable, loss-of-signal level set pin (SDLVL) sets the
sensitivity of the input amplitude detection. SD asserts high
if the input amplitude rises above the threshold set by SDLVL
and de-asserts low otherwise. SD can be fed back to the
enable (EN) input to maintain output stability under a loss
of signal condition. EN asserts the true output signal without
removing the input signal. Typically 4.6dB SD hysteresis is
provided to prevent chattering.
Please see Micrel’s website at www.micrel.com for a
complete selection of optical module ICs. The following table
summarizes the differences between devices in Micrel’s
latest family of Limiting Amplifiers.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Integrated 50
Ω
Part Number Input Termination
SY88773V
No
No
Yes
Yes
SY88823V
SY88843V
SY88973V
LOS
or SD
LOS
SD
SD
LOS
Active LOW
or HIGH Enable
LOW
HIGH
HIGH
LOW
APPLICATIONS
s
1.25Gbps and 2.5Gbps Gigabit Ethernet
s
1.062Gbps and 2.125Gbps Fibre Channel
s
155Mbps, 622Mbps, 1.25Gbps, and 2.5Gbps SONET/
SDH
s
Gigabit interface converter (GBIC)
s
Small form factor (SFF) and small form factor
pluggable (SFP) transceivers
s
Parallel 10G Ethernet
s
High-gain line driver and line receiver
Table 1. Limiting Amplifiers Selection Guide
TYPICAL PERFORMANCE
3.3V, 25°C, 10mV
pp
Input
@3.2Gbps 2
31
–1 PRBS, R
LOAD
= 50Ω to V
CC
Output Swing
(75mV/div.)
Micro
LeadFrame and MLF are trademarks of Amkor Technology
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
TIME (50ps/div.)
Rev.: C
Amendment: /0
1
Issue Date: November 2005
Micrel, Inc.
SY88843V
FUNCTIONAL BLOCK DIAGRAM
VCC
DIN
50Ω
/DIN
REF
REF
Generator
Level
Detect
2.8k
Ω
TTL
Buffer
Limiting
Amplifer
CML
Buffer
DOUT
/DOUT
VCC
25k
Ω
EN
VCC
4.75k
Ω
OC-TTL
Buffer
SD
SDLVL
GND
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
SY88843V
PACKAGE/ORDERING INFORMATION
Ordering Information
(1)
SDLVL
VCC
VCC
Part Number
SY88843VKI
12
11
10
9
Package
Type
K10-2
K10-2
MLF-16
MLF-16
K10-2
K10-2
MLF-16
MLF-16
Operating
Range
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Industrial
Package
Marking
843V
843V
843V
843V
843V with
Pb-Free bar-line indicator
843V with
Pb-Free bar-line indicator
843V with
Pb-Free bar-line indicator
843V with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Pb-Free
Matte-Sn
Pb-Free
Matte-Sn
Pb-Free
NiPdAu
Pb-Free
NiPdAu
16
EN
15
14
13
DIN
GND
GND
/DIN
1
2
3
4
5
6
7
8
/DOUT
GND
GND
/DOUT
SY88843VKITR
(2)
SY88843VMI
SY88843VMITR
(2)
SY88843VEY
(3)
SY88843VEYTR
(2, 3)
SY88843VMG
(3)
SY88843VMGTR
(2, 3)
VCC
REF
16-Pin MLF™ (MLF-16)
EN 1
DIN 2
/DIN 3
REF 4
SDLVL 5
10 VCC
9 DOUT
8 /DOUT
7 SD
6 GND
VCC
SD
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC Electricals only.
2. Tape and Reel.
3. Pb-Free package is recommended for new designs.
10-Pin EPAD-MSOP (K10-2)
PIN DESCRIPTION
Pin Number
(MSOP)
1
Pin Number
(MLF™)
15
Pin Name
EN
Type
TTL Input:
Default is high.
Differential
Data Input
Pin Function
Enable: De-asserts true data output when low.
Incorporates 25kΩ pull-up to VCC.
Differential data input. Each pin internally terminates to
REF through 50Ω.
Reference Voltage: Bypass with 0.01µF low ESR
capacitor from REF to VCC to stabilize SDLVL and REF.
Input:
Default is
maximum sensitivity.
Ground
Open Collector
TTL Output with
internal 4.75kΩ
pull-up resistor
Differential
CML Output
Power Supply
Signal Detect Level Set: A resistor from this pin to VCC
sets the threshold for the data input amplitude at which
the SD output will be asserted.
Device ground. Exposed pad must be soldered
(or equivalent) to the same potential as the ground pins.
Signal Detect: Asserts high when the data input amplitude
rises above the threshold set by SDLVL.
2, 3
4
5
1, 4
6
14
DIN, /DIN
REF
SDLVL
6
Exposed Pad
7
2, 3, 10, 11
Exposed Pad
7
GND
SD
8, 9
10
9, 12
5, 8, 13, 16
DOUT, /DOUT
VCC
Differential data output.
Positive power supply. Bypass with 0.1µF0.01µF low
ESR capacitors. 0.01µF capacitors should be as close as
possible to VCC pins.
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SY88843V
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
) ....................................... 0V to +7.0V
EN, SDLVL Voltage ................................................0 to V
CC
REF Current ...............................................................
±1mA
SD Current .................................................................
±5mA
DOUT, /DOUT Current .............................................
±25mA
DIN, /DIN Current .....................................................
±10mA
Storage Temperature (T
S
) ....................... –65°C to +150°C
Lead Temperature (Soldering, 20 sec.) .................... 260°C
Operating Ratings
(2)
Supply Voltage (V
CC
) .............................. +3.0V to +3.6V or
............................................................ +4.5V to +5.5V
Ambient Temperature (T
A
) ......................... –40°C to +85°C
Junction Temperature (T
J
) ....................... –40°C to +120°C
Package Thermal Resistance
(3)
MLF™
θ
JA
(Still-Air) ..................................................... 61°C/W
ψ
JB ...................................................................................
38°C/W
EPAD-MSOP
θ
JA
(Still-Air) ..................................................... 38°C/W
ψ
JB ...................................................................................
22°C/W
DC ELECTRICAL CHARACTERISTICS
V
CC
= 3.0V to 3.6V or 4.5V to 5.5V, T
A
= –40°C to +85°C; typical values at V
CC
= 3.3V, T
A
= 25°C
Symbol
I
CC
Parameter
Power Supply Current
Power Supply Current
V
REF
SDLVL
V
OH
V
OL
V
OFFSET
Z
O
Z
I
REF Voltage
SDLVL Voltage Range
DOUT, /DOUT HIGH Voltage
DOUT, /DOUT LOW Voltage
Differential Output Offset
Single-Ended Output Impedance
Single-Ended Input Impedance
Note 6
3.3V, Note 6
5V, Note 6
Note 6
40
40
50
50
V
REF
V
CC
–0.020 V
CC
–0.005
Condition
3.3V, Note 4
5V, Note 4
3.3V, Note 5
5V, Note 5
Min
Typ
28
30
45
47
V
CC
–1.3
V
CC
V
CC
Max
42
45
62
65
Units
mA
mA
mA
mA
V
V
V
V
V
mV
Ω
Ω
V
CC
–0.475 V
CC
–0.400 V
CC
–0.350
V
CC
–0.510 V
CC
–0.400 V
CC
–0.350
±80
60
60
TTL DC ELECTRICAL CHARACTERISTICS
V
CC
= 3.0V to 3.6V or 4.5V to 5.5V, T
A
= –40°C to +85°C
Symbol
V
OH
V
OL
V
IH
V
IL
I
IH
I
IL
Parameter
SD Output HIGH Level
SD Output LOW Level
EN Input HIGH Voltage
EN Input LOW Voltage
EN Input HIGH Current
EN Input LOW Current
V
IN
= 2.7V
V
IN
= V
CC
V
IN
= 0.5V
–0.3
Condition
Sourcing 100µA
Sinking 2mA
2.0
0.8
20
100
Min
2.4
Typ
Max
V
CC
0.5
Units
V
V
V
V
µA
µA
mA
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 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. Output levels are based on a 50Ω to V
CC
load impedance. If the load impedance is different, the output level will be changed. Amplifier is in limiting
mode.
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
SY88843V
AC ELECTRICAL CHARACTERISTICS
V
CC
= 3.0V to 3.6V or 4.5V to 5.5V, T
A
= –40°C to +85°C, R
LOAD
= 50Ω to V
CC
; typical values at V
CC
= 3.3V, T
A
= 25°C.
Symbol
PSRR
t
r
,t
f
t
JITTER
V
ID
V
OD
HYS
t
OFF
t
ON
V
SR
B
–3dB
A
V(Diff)
S
21
Notes:
7. Amplifier in limiting mode. Input is a 200MHz square wave, t
r
< 300ps.
8. Deterministic jitter measured using 2.488Gbps K28.5 pattern, V
ID
= 10mV
pp
. Random jitter measured using 2.488Gbps K28.7 pattern, V
ID
= 10mV
pp
.
9. Electrical signal.
10. This is the detectable range of input amplitudes that can de-assert SD. The input amplitude to assert SD is 2–8dB higher than the de-assert
amplitude. See “Typical Operating Characteristics” for graphs showing how to choose a particular V
SDLVL
or R
SDLVL
for a particular SD de-assert,
and its associated assert, amplitude. If increased SD sensitivity and hysteresis are required, an application note entitled “Notes on Sensitivity and
Hysteresis in Micrel Post Amplifiers” is available at http://www.micrel.com/product-info/app_hints+notes.shtml.
Parameter
Power Supply Rejection Ratio
Output Rise/Fall Time
(20% to 80%)
Deterministic
Random
Differential Input Voltage Swing
Differential Output Voltage Swing
SD Hysteresis
SD Release Time
SD Assert Time
SD Sensitivity Range
–3dB Bandwidth
Differential Voltage Gain
Single-Ended Small-Signal Gain
Condition
Min
Typ
35
Max
Units
dB
Note 7
Note 8
10
3.3V,
Note 7
5V,
Note 7
Note 9
700
700
2
60
15
5
120
ps
ps
PP
ps
RMS
1800
800
800
4.6
0.1
0.2
950
1020
8
0.5
0.5
35
2.0
mV
PP
mV
PP
mV
PP
dB
µs
µs
mV
PP
GHz
dB
dB
Note 10
10
32
26
38
32
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
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