SY88933AL_07 [MICREL]
3.3V, 1.25Gbps PECL High-Sensitivity Limiting Post Amplifier w/TTL Signal Detect; 3.3V ， 1.25Gbps的PECL高灵敏度限幅后置放大器W / TTL信号检测
| 型号： | SY88933AL_07 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 3.3V, 1.25Gbps PECL High-Sensitivity Limiting Post Amplifier w/TTL Signal Detect |
| 文件： | 总9页 (文件大小：319K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SY88933AL
3.3V, 1.25Gbps PECL High-Sensitivity
Limiting Post Amplifier w/TTL Signal Detect
General Description
Features
The SY88933AL high-sensitivity 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 SY88933AL quantizes these signals
and outputs PECL level waveforms.
• Single 3.3V power supply
• DC-to-1.25Gbps operation
• Low-noise PECL data outputs
• High gain SD
• Chatter-free open-collector TTL signal detect (SD)
output with internal 4.75kΩ pull-up resistor
The SY88933AL operates from a single +3.3V power
supply, over temperatures ranging from –40oC to
+85oC. With its wide bandwidth and high gain, signal
with data rates up to 1.25Gbps and as small as 5mVPP
can be amplified to drive devices with PECL inputs.
• TTL EN input
• Programmable SD level set (SDLVL
• Available in a tiny 10-pin MSOP package
• Pin-compatible with SY88933V
)
The SY88933AL generates a high gain signal-detect
(SD) open-collector TTL output. The SD function has a
high gain input stage for increased sensitivity. A
programmable signal-detect 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.
The enable input (EN) de-asserts the true output signal
without removing the input signal. The SD output can
be fed back to the EN input to maintain output stability
under a loss-of-signal condition. Typically, 3.4dB SD
hysteresis is provided to prevent chattering.
Applications
• GPON/BPON/EPON/GEPON
• Gigabit Ethernet
• 531Mbps and 1062Mbps Fibre Channel
• OC-3 and OC-12 SONET/SDH
• High-gain line driver and line receiver
• Low-gain TIA interface
Markets
• FTTX
• Optical transceiver
• Datacom/telecom
All support documentation can be found on Micrel’s
web site at: www.micrel.com.
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
M9999-021207-B
hbwhelp@micrel.com or (408) 955-1690
February 2007
Micrel, Inc.
SY88933AL
Typical Application Circuit
2
M9999-021207-B
hbwhelp@micrel.com or (408) 955-1690
February 2007
Micrel, Inc.
SY88933AL
Ordering Information
Part Number
Package
Type
Operating
Range
Package Marking
Lead
Finish
SY88933ALKG
SY88933ALKGTR(1)
K10-1
Industrial
933A with Pb-Free bar line indicator
933A with Pb-Free bar line indicator
NiPdAu
Pb-Free
K10-1
Industrial
NiPdAu
Pb-Free
SY88933ALKI
SY88933ALKITR(1)
K10-1
K10-1
Industrial
Industrial
933A
933A
SnPb
SnPb
Note:
1. Tape and Reel.
Pin Configuration
10-Pin MSOP (K10-1)
Pin Description
Pin Number
Pin Name
Type
Pin Function
1
EN
TTL Input: Default is
HIGH.
Enable: This input enables the outputs when it is HIGH. Note that
this input is internally connected to a 25kΩ pull-up resistor and will
default to a logic HIGH state if left open.
2
3
4
DIN
/DIN
Data Input
Data Input
True data input.
Complementary data input.
VREF
Reference voltage: Placing a capacitor here to VCC helps stabilize
SDLVL
.
5
SDLVL
Input
Signal-Detect Level Set: a resistor from this pin to VCC sets the
threshold for the data input amplitude at which SD will be asserted.
6
7
GND
SD
Ground
Device ground.
Open-collector TTL
output w/internal
4.75kΩ pull-up
resistor
Signal-Detect: asserts high when the data input amplitude rises
above the threshold set by SDLVL
.
8
9
/DOUT
DOUT
VCC
PECL Output
PECL Output
Power Supply
Complementary data output.
True data output.
10
Positive power supply.
3
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hbwhelp@micrel.com or (408) 955-1690
February 2007
Micrel, Inc.
SY88933AL
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VCC).................................. 0V to +7.0V
Input Voltage (DIN, /DIN) ..................................0 to VCC
Supply Voltage (VCC)............................+3.0V to +3.6V
Ambient Temperature (TA) ..................–40°C to +85°C
Junction Temperature (TJ) ................–40°C to +120°C
Junction Thermal Resistance
Output Current (IOUT
)
Continuous.....................................................50mA
Surge ...........................................................100mA
EN Voltage ........................................................0 to VCC
MSOP (θJA) Still-air................................. 113°C/W
VREF Current .................................... –800µA to +500µA
SDLVL Voltage...............................................VREF to VCC
Lead Temperature (soldering, 20sec.)................ 260°C
Storage Temperature (Ts) .................. –65°C to +150°C
DC Electrical Characteristics
VCC = +3.0V to +3.6V; RLOAD = 50Ω to VCC–2V; TA = –40°C to +85°C; typical values at VCC = +3.3V, TA = +25oC.
Symbol
ICC
Parameter
Condition
Min
Typ
Max
39
Units
mA
V
Power Supply Current
SDLVL Voltage
No output load
26
SDLVL
VOH
VREF
VCC
PECL Output HIGH Voltage
PECL Output LOW Voltage
Common Mode Range
Reference Voltage
VCC-1.085 VCC-0.955 VCC-0.880
VCC-1.850 VCC-1.705 VCC-1.555
V
VOL
V
VIHCMR
VREF
GND+2.0
VCC
V
VCC-1.48 VCC-1.32 VCC-1.16
V
TTL DC Electrical Characteristics
VCC = 3.0V to 3.6V; RLOAD = 50Ω to VCC-2V; TA = –40°C to +85°C.
Symbol
VIH
Parameter
Condition
Min
Typ
Max
Units
V
EN Input HIGH Voltage
EN Input LOW Voltage
EN Input HIGH Current
2.0
VIL
0.8
20
V
IIH
VIN = 2.7V
µA
µA
mA
V
V
IN = VCC
100
IIL
EN Input HIGH Current
SD Output HIGH Level
VIN = 0.5V
-0.3
2.4
2.0
VOH
VCC > 3.3V, IOH-MAX < 160uA
V
CC < 3.3V, IOH-MAX < 160uA
V
VOL
SD Output LOW Level
IOL = +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.
4
M9999-021207-B
hbwhelp@micrel.com or (408) 955-1690
February 2007
Micrel, Inc
SY88933AL
AC Electrical Characteristics
VCC = 3.0V to 3.6V; RLOAD = 50 to VCC–2V; TA = –40°C to +85°C; typical values at VCC = +3.3V, TA = +25oC.
Symbol Parameter
Condition
Min
Typ
Max
Units
dB
PSRR
tr, tf
Power Supply Rejection Ratio
35
Output Rise/Fall Time
(20% to 80%)
ps
Note 3
260
tJITTER
Deterministic
Note 4
Note 5
Figure 1
15
5
pspp
psRMS
mVpp
mVpp
µs
Random
VID
Differential Input Voltage Swing
5
1800
VOD
Differential Output Voltage Swing VID > 18mVpp, Figure 1
SD Release Time
1500
2
TOFF
TON
10
10
SD Assert Time
2
µs
SDAL
SDDL
HYSL
SDAM
SDDM
HYSM
SDAH
SDDH
HYSH
B-3dB
AV(Diff)
S21
Low SD Assert Level
RSDLVL = 15kΩ, Note 6
RSDLVL = 15kΩ, Note 6
RSDLVL = 15kΩ, Note 7
RSDLVL = 5kΩ, Note 6
RSDLVL = 5kΩ, Note 6
RSDLVL = 5kΩ, Note 7
RSDLVL = 100Ω, Note 6
RSDLVL = 100Ω, Note 6
RSDLVL = 100Ω, Note 7
3.4
2.3
3.4
6.2
4.2
3.4
16.4
10.8
3.4
1
6.5
mVpp
mVpp
dB
Low SD De-assert Level
Low SD Hysteresis
1.0
1
4.5
8
Medium SD Assert Level
Medium SD De-assert Level
Medium SD Hysteresis
High SD Assert Level
High SD De-assert Level
High SD Hysteresis
mVpp
mVpp
dB
3
2
4.5
20
mVpp
mVpp
dB
8
2
4.5
3dB Bandwidth
GHz
dB
Differential Voltage Gain
Single-Ended Small-Signal Gain
42
30
36
dB
Notes:
3. Amplifier in limiting mode. Input is a 200MHz square wave.
4. Deterministic jitter measured using 1.25Gbps K28.5 pattern, VID = 10mVpp.
5. Random jitter measured using 1.25Gbps K28.7 pattern, VID = 10mVpp.
6. See “Typical Operating Characteristics” for a graph showing how to choose a particular RSDLVL for a particular SD assert and
its associated de-assert amplitude.
7. This specification defines electrical hysteresis as 20log (SD Assert/SD De-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 on that ratio, the optical hysteresis corresponding to the electrical hysteresis range 1dB-4.5 dB, shown
in the AC characteristics table, will be 0.5dB-3dB optical hysteresis
5
M9999-021207-B
hbwhelp@micrel.com or (408) 955-1690
February 2007
Micrel, Inc
SY88933AL
Typical Characteristics
6
M9999-021207-B
hbwhelp@micrel.com or (408) 955-1690
February 2007
Micrel, Inc
SY88933AL
Functional Block Diagram
Detailed Description
Signal-Detect
The SY88933AL low-power limiting post amplifier
operates from a single +3.3V power supply, over
temperatures from –40oC to +85oC. Signals with data
rates up to 1.25Gbps, and as small as 5mVpp, can be
amplified. Figure 1 shows the allowed input voltage
swing. The SY88933AL generates an SD output. SDLVL
sets the sensitivity of the input amplifier section.
The SY88933AL generates a chatter-free SD open-
collector TTL output with an internal 4.75kΩ pull-up
resistor as shown in Figure 4. SD is used to determine
that the input amplitude is large enough to be
considered a valid input. 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 de-asserts the true output
signal without removing the input signals. Typically,
3.4dB SD hysteresis is provided to prevent chattering.
Input Amplifier/Buffer
Figure
2
shows
a
simplified schematic of the
SY88933AL’s input stage. The high-sensitivity of the
input amplifier allows signals as small as 5mVpp to be
detected and amplified. The input amplifier also allows
input signals as large as 1800mVpp. Input signals are
linearly amplified with a typical 42dB differential voltage
gain. Since it is a limiting amplifier, the SY88933AL
outputs typically 1500mVpp voltage-limited waveforms
for input signals that are greater than 12mVpp.
Applications requiring the SY88933AL to operate with
high-gain should have the upstream TIA placed as close
as possible to the SY88933AL’s input pins to ensure the
best performance of the device.
Signal-Detect Level Set
A programmable SD level set pin (SDLVL) sets the
threshold of the input amplitude detection. Connecting
an external resistor between VCC and SDLVL sets the
voltage at SDLVL. This voltage ranges from VCC to VREF
The external resistor creates a voltage divider between
CC and VREF, as shown in Figure 5.
.
V
Hysteresis
The SY88933AL provides typically 3.4dB SD electrical
hysteresis. By definition, a power ratio measured in dB
is 10log (power ratio). Power is calculated as V2IN/R for
an electrical signal. Hence, the same ratio can be stated
as 20log (voltage ratio). While in linear mode, the
electrical voltage input changes linearly with the optical
power and hence, the ratios change linearly. Therefore,
the optical hysteresis in dB is half the electrical
hysteresis in dB given in the data sheet. The
SY88933AL is an electrical device, and this data sheet
refers to hysteresis in electrical terms. With 3.4dB SD
hysteresis, a voltage factor of 1.5 is required to assert or
de-assert SD.
Output Buffer
The SY88933AL’s PECL output buffer is designed to
drive 50Ω lines. The output buffer requires appropriate
termination for proper operation. An external 50Ω
resistor to VCC–2V for each output pin provides this.
Figure 3 shows a simplified schematic of the output
stage.
7
M9999-021207-B
hbwhelp@micrel.com or (408) 955-1690
February 2007
Micrel, Inc
SY88933AL
Figure 1. VIS and VID Definitions
Figure 2. Input Structure
Figure 3. Output Structure
Figure 4. SD Output Structure
Figure 5. SDLVL Setting Circuit
Note: Recommended value for RSDLVL is 15kΩ or less.
Related Product and Support Documentation
Part Number
Function
Data Sheet Link
Application Notes
Notes on Sensitivity and Hysteresis in Micrel http://www.micrel.com/product-info/app_hints+notes.shtml
Post Amplifiers
8
M9999-021207-B
hbwhelp@micrel.com or (408) 955-1690
February 2007
Micrel, Inc
SY88933AL
Package Information
10-Pin MSOP (K10-1)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for
its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a
product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for
surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant
injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk
and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
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M9999-021207-B
hbwhelp@micrel.com or (408) 955-1690
February 2007
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