SY88923AVKG-TR [MICROCHIP]
ATM/SONET/SDH SUPPORT CIRCUIT, PDSO10;
| 型号： | SY88923AVKG-TR |
| 厂家： | 
MICROCHIP |
| 描述： | ATM/SONET/SDH SUPPORT CIRCUIT, PDSO10 ATM 异步传输模式 光电二极管 |
| 文件： | 总8页 (文件大小：65K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SY88923AV
5V/3.3V 3.2Gbps HIGH-SPEED
LIMITING POST AMPLIFIER
DESCRIPTION
FEATURES
■ Single 3.3V or 5V power supply
■ Up to 3.2Gbps operation
The SY88923AV 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
■ Low noise PECL data outputs
■ Chatter-free open collector TTL LOS output
■ TTL /EN Input
3.2Gbps. Signals as small as 5mV
can be amplified
PP
to drive devices with PECL inputs. The SY88923AV
generates a chatter-free Loss-of-Signal (LOS) open
collector TTL output.
The SY88923AV incorporates a programmable level
detect function to identify when the input signal has been
lost. The LOS output will change from logic “LOW” to logic
“HIGH” when input signal is smaller than the swing set by
■ Differential PECL inputs for data
■ Available in a tiny 10-pin (3mm) MSOP and 10-pin
(3mm) EPAD-MSOP
LOS . This information can be fed back to the EN input
LVL
of the device to maintain stability under loss-of-signal
condition. Using LOS
detection can be adjusted. The LOS
pin, the sensitivity of the level
LVL
APPLICATIONS
voltage can be set
LVL
by connecting a resistor divider between V
and V
CC
REF
■ 1.25Gbps and 2.5Gbps Gigabit Ethernet
■ 531Mbps, 1062Mbps and 2.12Gbps Fibre Channel
■ 622Mbps SONET
shown in Figure 3. “Typical Operating Characteristics” on
page 6 show the relationship between input level sensitivity
and the voltage set on LOS
LVL
.
The LOS output is a TTL open collector output that
requires a pull-up resistor for proper operation, Figure 1.
■ Gigabit interface converter
■ 2.5Gbps SDH/SONET
■ 2.5Gbps proprietary links
VCC
SY88923AV
■ Parallel 10G Ethernet
4.7kΩ to 10kΩ
LOS
Figure 1. LOS Output with Desired Rise Time
BLOCK DIAGRAM
DIN
DOUT
ECL
Buffer
Limiting
Amplifer
/DIN
/DOUT
/EN
VREF
VCC
Enable
Level
Detect
GND
LOS
LOSLVL
Rev.: F
Amendment: /0
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
1
Issue Date: November2005
Micrel, Inc.
SY88923AV
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
/EN
DIN
1
2
3
4
5
10 VCC
Package Operating
Package
Marking
Lead
Finish
9
8
7
6
DOUT
Part Number
Type
K10-1
K10-1
K10-2
K10-2
K10-1
Range
/DIN
/DOUT
LOST
GND
SY88923AVKC
SY88923AVKCTR(2)
Commercial
Commercial
Commercial
Commercial
Industrial
923AV
923AV
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
NiPdAu
VREF
LOSLVL
SY88923AVEC
923AV
SY88923AVECTR(2)
SY88923AVKG(3)
923AV
10-Pin MSOP (K10-1)
10-Pin EPAD-MSOP (K10-2)
923AV with
Pb-free bar-line indicator Pb-Free
923AV with NiPdAu
Pb-free bar-line indicator Pb-Free
923AV with Matte-Sn
Pb-free bar-line indicator Pb-Free
923AV with Matte-Sn
Pb-free bar-line indicator Pb-Free
SY88923AVKGTR(2, 3)
SY88923AVEY(3)
K10-1
K10-2
K10-2
Industrial
Industrial
Industrial
SY88923AVEYTR(2, 3)
Notes:
1. Contact factory for die availability. Dice are guaranteed at T = 25°C, DC Electricals only.
A
2. Tape and Reel.
3. Pb-Free package is recommended for new designs.
PIN DESCRIPTION
Pin Number
MSOP
Pin Number
EPAD-MSOP
Pin Name
/EN
Type
TTL Input
Data Input
Data Input
Output
Pin Function
1
2
3
4
5
6
1
2
3
4
5
Output Enable (Active Low).
DIN
Data Input.
/DIN
Inverting Data Input.
VREF
LOSLVL
GND
Reference Voltage Output for LOS Level Set (see Figure 3).
LOS Limit Set.
Input
6,
Ground
Ground. Exposed pad must be connected to PCB ground
plane.
(Exposed Pad)
7
7
LOS
TTL Output
Loss of Signal Indicator (Active High).
(Open Collector)
8
9
8
9
/DOUT
DOUT
VCC
PECL Output
PECL Output
Power Supply
Inverting Data Output.
Data Output.
10
10
Positive Power Supply.
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88923AV
Absolute Maximum Ratings(1)
Operating Ratings(2)
Power Supply Voltage (V ) ............................ 0V to +7.0V
Supply Voltage (V ) .................................. +3.0V to +5.5V
CC
CC
Input Voltage
Ambient Temperature (T ) ......................... –40°C to +85°C
A
(D , /D ) ........................................................ 0V to V
(/EN) ................................................................ 0V to V
Package Thermal Resistance
IN
IN
CC
CC
CC
MSOP (θ
)
JA
(LOS ).......................................................... 0V to V
Still-Air ...........................................................113°C/W
LVL
Output Voltage (with 50Ω load)
EPAD-MSOP (θ )
JA
(D
(V
, /D
) .......................... V –2.5V to V +0.3V
Still-Air .............................................................38°C/W
OUT
OUT CC CC
)..................................................V –2.0V to V
REF
CC
CC
Lead Temperature (soldering, 20 sec.) ..................... 260°C
Storage Temperature (T ) ....................... –55°C to +125°C
S
(3)
DC ELECTRICAL CHARACTERISTICS
VCC =+5V ±10% or +3.3V ±10%; RL = 50Ω to VCC –2V; TA = –40°C to +85°C; unless otherwise noted.
Symbol
Parameter
Condition
Min
Typ
Max
Units
ICC
Power Supply Current
No output load
VCC = 5V ±10%,
VCC = 3.3V ±10%
38
35
60
53
mA
mA
IIL
/EN Input LOW Current
/EN Input HIGH Current
VIN = 0.5V
–0.3
mA
IIH
VIN = 2.7V
VIN = VCC
20
100
µA
µA
VCMR
Voffset
LOSLVL
VOL
Common Mode Range
Differential Output Offset
LOSLVL Level
GND +2.0
VREF
VCC
±80
VCC
0.5
V
mV
V
LOS Output LOW Level
LOS Output Leakage
IOL = +2mA
VOH = 5.5V
V
IOH
100
µA
VOH
DOUT and /DOUT
Output HIGH Voltage
VCC –1085 VCC –955 VCC –880
mV
VOL
DOUT and /DOUT
Output LOW Voltage
VCC –1830 VCC –1705 VCC –1555 mV
VREF
IREF
VIH
Reference Supply
VCC –1.38 VCC –1.32 VCC –1.26
V
mA
V
VREF Output Current
/EN Input HIGH Voltage
/EN Input LOW Voltage
–0.8
0.5
0.8
2.0
VIL
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 ratlng 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. The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is
tested in a socket such that transverse airflow of ≥500lfpm is maintained.
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88923AV
AC ELECTRICAL CHARACTERISTICS
VCC =+5V ±10% or +3.3V ±10%; RL = 50Ω to VCC –2V; TA = –40°C to +85°C; unless otherwise noted.
Symbol
VID
Parameter
Condition
Min
Typ
Max
Units
Input Voltage Range
Differential Output Voltage Swing
5
1800
mVPP
VOD
Note 4
V
ID = 15mVPP
1400
600
mVPP
mVPP
VID = 5mVPP
tON
LOS Assert Time
Note 5
0.2
0.1
0.5
0.5
50
µs
µs
tOFF
VSR
HYS
tr, tf
LOS Release Time
LOS Sensitivity Range
LOS Hysteresis
Note 5
223–1 pattern
223–1 pattern
VID > 100mV
5
2
mVPP
dB
4.6
8
Output Rise/Fall Time
115
trin,tfin
150
ps
VID < 100mVPP
PP
Notes:
4. Input is a 200MHz square wave, t < 300ps.
r
5. Input is a 200MHz square wave, t < 300ps, 1.8V
.
PP
r
M9999-110905
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Micrel, Inc.
SY88923AV
GENERAL DESCRIPTION
General
The SY88923AV is an integrated limiting amplifier
intended for high-frequency fiber-optic applications. The
circuit connects to typical trans-impedance amplifiers found
within a fiber-optics link. The linear signal output from a
trans-impedance amplifier can contain significant amounts
of noise, and may vary in amplitude over time. The
SY88923AV limiting amplifier quantizes the signal and
outputs a voltage-limited waveform.
The /EN pin allows the user to disable the output signal
without removing the input signal.
DESIGN PROCEDURE
Output Termination
The SY88923AV ground pin should be connected to the
circuit board ground. Use multiple PCB vias close to the
part to connect to ground. Avoid long, inductive runs which
can degrade performance.
The SY88923AV outputs must be terminated with a 50Ω
load to V – 2V (or Thevenin equivalent).
CC
Layout and PCB Design
Since the SY88923AV 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.
VCC
R1
LOSLVL
R2
0.1µF
DIN+
VREF
0.1µF
DIN—
50Ω
50Ω
VREF
Figure 3. LOS
Circuit
LVL
R2 × 1.32V
Note 1. LOS
= V
–1.32V +
LVL
CC
VCC
R1 + R2
0.1µF
R1 + R2 ≥ 2.6kΩ
Figure 2. Differential Input Configuration
M9999-110905
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Micrel, Inc.
SY88923AV
TYPICAL OPERATING CHARACTERISTICS
LOS Assert and De-Assert
LOS Assert and De-Assert
Levels vs. LOS
Levels vs. LOS
LVL
LVL
100
100
90
80
70
60
50
40
30
20
10
0
3.3V
90
5.0V
TA = 25¡C
TA = 25¡C
80
2.5Gbps
2.5Gbps
70
Pattern 223-1
Pattern 223-1
60
50
De-Assert
De-Assert
40
30
20
10
0
Assert
Assert
0
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2
0
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2
LOS = V — V (V)
LOS
= V — V (V)
CC
LVL
LVL
CC
LOS Assert and De-Assert
LOS Assert and De-Assert
Levels vs. LOS
Levels vs. LOS
LVL
LVL
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
5.0V
3.3V
TA = 25¡C
TA = 25¡C
2.5Gbps
2.5Gbps
Pattern 27-1
Pattern 27-1
De-Assert
De-Assert
Assert
Assert
0
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2
LOS = V — V (V)
0
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2
LOS = V — V (V)
LVL
CC
LVL
CC
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
6
Micrel, Inc.
SY88923AV
10-PIN MSOP (K10-1)
Rev. 00
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
7
Micrel, Inc.
SY88923AV
10-PIN EPAD-MSOP (K10-2)
+0.08
-0.08
+0.003
-0.003
+0.05
-0.05
+0.002
-0.002
+0.15
-0.15
+0.004
-0.004
+0.10
-0.10
+0.008
-0.008
+0.07
-0.08
+0.004
+0.003
+0.003
-0.004
-0.003
-0.003
+0.15
Rev.01
-0.15
+0.006
-0.006
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 datasheet 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
M9999-110905
hbwhelp@micrel.com or (408) 955-1690
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