SY88913KGTR [MICREL]
1.25Gbps HIGH-SPEED LIMITING POST AMPLIFIER; 1.25Gbps的高速限幅后置放大器
| 型号： | SY88913KGTR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 1.25Gbps HIGH-SPEED LIMITING POST AMPLIFIER |
| 文件： | 总8页 (文件大小：81K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SY88913
1.25Gbps HIGH-SPEED
LIMITING POST AMPLIFIER
DESCRIPTION
FEATURES
■ Up to 1.25Gbps operation
■ Low noise
The SY88913 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 1.25Gbps.
Signals as small as 5mVp-p can be amplified to drive
devices with PECL inputs. The SY88913 generates a
chatter-free PECL Loss of Signal (/LOS).
■ Chatter-Free /LOS Generation
■ PECL /LOS Output
■ TTL /EN Input
The SY88913 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 LOSLVL pin the sensitivity of the level detect can
be adjusted. The LOSLVL voltage can be set by
connecting a resistor divider between VCC and VREF,
Figure 2. Figure 3 shows the relationship between input
level sensitivity and the voltage set on LOSLVL. Figure 4
shows the relationship between input level sensitivity and
resistor divider ratio.
■ Differential PECL inputs for data
■ /EN input is TTL with internal 27K pull-up
■ Single power supply
■ Designed for use with SY88902 and SY88904
■ Available in a tiny 10-pin (3mm x3 mm) MSOP
APPLICATIONS
■ 1.25Gbps Gigabit Ethernet
■ 531Mbps and 1062Mbps Fibre Channel
■ 622Mbps SONET
■ Gigabit Interface Converter
BLOCK DIAGRAM
D
IN
D
OUT
OUT
Limiting
Amplifier
ECL
Buffer
D
D
IN
REF
CC
V
EN
Enable
V
Level
Detect
GND
LOS
LOSLVL
Rev.: F
Amendment:/0
M9999-081505
hbwhelp@micrel.com or (408) 955-1690
1
Issue Date: August 2005
Micrel, Inc.
SY88913
PACKAGE/ORDERING INFORMATION
Ordering Information
Package
Type
Operating
Range
Package
Marking
Lead
Finish
/EN
1
2
3
4
5
10 VCC
Part Number
SY88913KC
SY88913KCTR(1)
DIN
9
8
7
6
DOUT
K10-1
K10-1
K10-1
Commercial
Commercial
Commercial
913
913
Sn-Pb
Sn-Pb
MSOP
K10-1
/DIN
/DOUT
/LOS
GND
VREF
SY88913KG
913 with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
LOSLVL
SY88913KGTR(1)
K10-1
Commercial
913 with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
10-Pin MSOP (K10-1)
Note:
1. Tape and Reel.
PIN NAMES
GENERAL DESCRIPTION
General
Pin
Type
Data Input
Data Input
Input
Function
The SY88913 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 SY88913
limiting amplifier quantizes the signal and outputs a voltage-
limited waveform.
DIN
Data Input
/DIN
Inverting Data Input
LOS LVL
/EN
Loss of Signal Level Set
Output Enable (active Low)
TTL Input
PECL Output
/LOS
Loss of Signal Indicator
(active Low)
GND
DOUT
/DOUT
VCC
Ground
Ground
The TTL /EN pin allows the user to disable the signal
without removing the input signal.
PECL Output
PECL Output
Power Supply
Output
Data Output
Inverting Data Output
Positive Power Supply
VREF
Reference Voltage Output
for LOS Level Set (see Fig. 2)
M9999-081505
hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88913
(1)
ABSOLUTE MAXIMUM RATINGS
Symbol
Rating
Power Supply Voltage
Input Voltage
Value
0 to +7.0
Unit
VCC
V
V
DIN, /DIN
0 to VCC
DOUT, /DOUT, /LOS
Output Voltage (with 50Ω load)
Operating Temperature Range
Storage Temperature Range
VCC –2.5, VCC +0.3
–40 to +85
V
TA
°C
°C
Tstore
–55 to +125
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.
DC ELECTRICAL CHARACTERISTICS
V
= +5V ±10%, R
= 50Ω to V –2V, T = –40°C to +85°C.
CC
LOAD
CC
A
TA = –40°C
TA = 0°C
TA = +25°C
TA = +85°C
Symbol
ICC
Parameter
Min.
Max.
Min.
Max.
35
Min.
—
Typ.
Max.
35
Min.
—
Max.
Unit
mA
mA
µA
Power Supply Current(1)
/EN Input LOW Current
/EN Input HIGH Current
—
35
—
—
21
—
35
—
IIL
–0.3(5)
–0.3(5)
—
–0.3(5)
—
–0.3(5)
IIH
—
—
20(2)
100(3)
—
—
20(2)
100(3)
—
—
—
—
20(2)
100(3)
—
—
20(2)
100(3)
VCMR
Common Mode Range
Differential Output Offset
GND +2.0
—
V
–1.0 GND +2.0 V –1.0 GND +2.0
—
—
—
V
–1.0 GND +2.0
V –1.0
CC
V
mV
V
CC
CC
CC
Voffset
±100
—
±100
—
±100
—
±100
LOSLVL LOSLVL Level
VOH DOUT and /DOUT
VREF
VCC
VREF
VCC
VREF
VCC
VREF
VCC
V
–1085
V
–880 V –1025 V –880
V
–1025
V
–955
V
–880 V –1025
V
–880 mV
CC
CC
CC
CC
CC
CC
CC
CC
CC
HIGH Output
VOL
DOUT and /DOUT
LOW Output
V –1830 V –1555 V –1810 V –1620 V –1810 V –1705 V –1620 V –1810 V –1620 mV
CC CC CC CC CC CC CC CC CC
VREF
VIH
Reference Supply(4)
V
–2.625 V –2.325 V –2.625V –2.325 V –2.625 V –2.475 V –2.325 V –2.625 V –2.325
V
V
V
CC
CC
CC
CC
CC
CC
CC
CC
CC
/EN Input HIGH Voltage
/EN Input LOW Voltage
2.0
—
2.0
—
2.0
—
—
—
2.0
—
VIL
—
0.8
—
0.8
—
0.8
—
0.8
Notes:
1. No output load.
2. V = 2.7V.
IN
3. V = V
.
CC
IN
4. I
must be limited to be within –0.8mA (source) and 0.5mA (sink).
REF
5. V = 0.5V.
IN
M9999-081505
hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88913
AC ELECTRICAL CHARACTERISTICS
V
= +5V ±10%, R
= 50Ω to V –2V, T = –40°C to +85°C.
CC
LOAD CC A
TA = –40°C
TA = 0°C
TA = +25°C
TA = +85°C
Symbol
Parameter
Min. Max. Min. Max. Min. Typ. Max. Min. Max. Unit
Conditions
PSRR
Power Supply(1)
Rejection Ratio
—
5
—
—
5
—
—
5
35
—
—
—
5
—
dB
Input referred,
55MHz
VID
tr, tf
Input Voltage Range
Output Rise/Fall Time
1800
1800
1800
1800 mVPP
—
—
350
—
—
—
350
—
—
—
200
trin,tfin
350
—
—
—
350
—
ps
VID > 100mVPP
VID < 100mVPP
VOD
tOFFL
tOFFH
Differential Output
Voltage Swing(2)
—
—
—
—
—
—
—
—
—
—
600
200
—
—
—
—
—
—
mV
mV
VID = 15mVPP
VID = 5mVPP
/LOS Release Time(3)
Minimum Input
—
0.5
—
0.5
—
0.1
0.5
—
0.5
0.5
0.5
µs
µs
µs
/LOS Release Time(4)
Maximum Input
—
0.5
—
0.5
—
0.1
0.5
—
tONL
VSR
/LOS Assert Time(3)
/LOS Sensitivity Range
/LOS Hysteresis
—
5
0.5
50
8
—
5
0.5
50
8
—
5
0.2
—
0.5
50
8
—
5
50 mVPP
dB
HYS
2
2
2
4.6
2
8
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, 8mVPP
4. Input is a 200MHz square wave, tr < 300ps, 1.8VPP
.
.
M9999-081505
hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88913
APPLICATION NOTE
Output Termination
The SY88913 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 SY88913 outputs must be terminated with a 50Ω
load to VCC – 2V (or Thevenin equivalent).
Layout and PCB Design
Since the SY88913 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
R2
0.1µF
0.1µF
D
IN
+
DIN
–
LOSLVL
50Ω
50Ω
VREF
V
REF
0.1µF
Notes:
Resistor Divider = R2/ (R1 + R2)
R1 + R2 ≥ 5kΩ
Figure 1. Differential Input Configuration
Figure 2. LOSLVL Circut
M9999-081505
hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88913
PERFORMANCE CURVE
100.00
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
Deassert
Assert
LOSlvl (V)
Figure 3. LOS Assert and Deassert Levels vs Resistor Divider
100.00
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
Deassert
Assert
Resistor Divider R2 / (R1 + R2)
Figure 4. Resistor Divider R2 / (R1 + R2)
M9999-081505
hbwhelp@micrel.com or (408) 955-1690
6
Micrel, Inc.
SY88913
APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION
GBIC Terminal
130Ω
130Ω
82Ω
82Ω
130Ω
130Ω
82Ω
82Ω
REXT
24Ω
Laserdiode
20kΩ
BLM21A102S
0.1µF
130Ω
82Ω
Photodiode
1000pF
130Ω
82Ω
M9999-081505
hbwhelp@micrel.com or (408) 955-1690
7
Micrel, Inc.
SY88913
10 LEAD MSOP (K10-1)
Rev. 00
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 at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
M9999-081505
hbwhelp@micrel.com or (408) 955-1690
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