SY88993AV [MICREL]
5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER; 5V / 3.3V的3.2Gbps高速限幅后置放大器
| 型号： | SY88993AV |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER |
| 文件： | 总9页 (文件大小：74K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
5V/3.3V 3.2Gbps HIGH-SPEED
LIMITING POST AMPLIFIER
SY88993AV
DESCRIPTION
FEATURES
■ > 3.2Gbps operation
The SY88993AV limiting post amplifier with its high and
wide bandwidth is ideal for use as a post amplifier in fiber-
optic receivers with data rates up to 3.2Gbps. Signals as
small as 4mVp-p can be amplified to drive devices with
CML inputs or AC coupled PECL inputs. The SY88993AV
generates a chatter-free Loss of Signal (LOS) open collector
TTL output.
The SY88993AV 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.
■ Low noise CML Data Outputs
■ Chatter-Free LOS generation
■ Open Collector TTL LOS output
■ TTL /EN Input
■ Differential PECL inputs for data
■ Single 3.3V or 5V power supply
■ Designed for use with SY88922V and SY88905
■ Available in a tiny 10-pin (3mm) MSOP
Using LOS
pin the sensitivity of the level detect can be
LVL
adjusted. The LOS
voltage can be set by connecting a
LVL
resistor divider between V and V
, Figure 3.
CC
REF
PIN CONFIGURATION
BLOCK DIAGRAM
/EN
1
2
3
4
5
10 VCC
D
IN
IN
D
OUT
OUT
DIN
9
8
7
6
DOUT
Limiting
Amplifer
CML
Buffer
MSOP
K10-1
/DIN
/DOUT
LOS
D
D
VREF
LOSLVL
GND
V
REF
CC
Enable
EN
V
Level
Detect
GND
APPLICATIONS
■ 1.25Gbps and 2.1Gbps Gigabit Ethernet
LOS
LOSLVL
■ 531Mbps, 1062Mbps and 2.5Gbps SONET/SDH Fibre
Channel
■ 622Mbps
■ Gigabit interface converter (GBIC)
■ Small Form Factor Trancievers
■ Parallel 10G Ethernet
VCC
SY88993AV
LOS
4.7k to 10k
Rev.: A
Amendment:/1
1
Issue Date: October, 2000
Micrel
SY88993AV
PIN NAMES
GENERAL DESCRIPTION
General
Pin
DIN
Type
Data Input
Data Input
Input
Function
Data Input
The SY88993AV 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
SY88993AV limiting amplifier quantizes the signal and
outputs a voltage-limited waveform.
/DIN
Inverting Data Input
LOSLVL
/EN
Loss of Signal Level Set
Output Enable (Active Low)
TTL Input
LOS
TTL Output
(Open Collector)
Loss of Signal Indicator
(Active High)
GND
DOUT
/DOUT
VCC
Ground
Ground
The /EN pin allows the user to disable the output signal
without removing the input signal.
CML Output
CML Output
Power Supply
Output
Data Output
Inverting Data Output
Positive Power Supply
VREF
Reference Voltage Output
for LOS Level Set (see Fig. 3)
(1)
ABSOLUTE MAXIMUM RATINGS
Symbol
Rating
Value
0 to +7.0
Unit
V
VCC
Power Supply Voltage
Input Voltage
DIN, /DIN
TA
0 to VCC
V
Operating Temperature Range
Storage Temperature Range
–40 to +85
–55 to +125
°C
°C
Tstore
NOTE:
1. PermanentdevicedamagemayoccurifABSOLUTEMAXIMUMRATINGSareexceeded. Thisisastressratingonlyandfunctionaloperationisnotimplied
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
Micrel
SY88993AV
DC ELECTRICAL CHARACTERISTICS
V
= +3.3V ±10% or +5V ±10%, R
= 50Ω to V
CC
LOAD
TA = –40°C
Min. Max.
55
CC
TA = 0°C
TA = +25°C
TA = +85°C
Symbol
Parameter
Min.
—
Max.
55
Min.
—
Typ.
43
Max.
55
Min.
—
Max.
65
Unit
mA
mA
mA
ICC
Power Supply
5.0V
3.3V
—
Current(1)
—
50
—
—
50
—
40
50
—
60
IIL
/EN Input LOW
Current
–0.3(4)
–0.3(4)
—
–0.3(4)
—
—
–0.3(4)
—
IIH
IOH
/EN Input HIGH
Current
—
—
20(5)
—
—
20(5)
—
—
—
—
20(5)
—
—
20(5)
µA
100(6)
100(6)
100(6)
100(6)
LOS Output Leakage(2)
—
—
100
—
—
100
—
—
—
100
—
—
100
uA
VOFFSET Differential Output
Offset
±80
±80
±9
±80
±80
mV
VCMR
Common Mode Range GND±2 VCC–0.2 GND±2 VCC–0.2 GND±2
VCC–0.2 GND±2 VCC–0.2
V
V
V
LOSLVL LOSLVL Level
VREF
—
VCC
0.5
VREF
—
VCC
0.5
VREF
—
—
—
VCC
0.5
VREF
—
VCC
0.5
VOL
LOS Output Low
Level(3)
VREF
VIH
Reference Voltage
VCC –1.38 VCC –1.26 VCC –1.38 VCC –1.26 VCC –1.38 VCC –1.32 VCC –1.26 VCC –1.38 VCC –1.26
V
V
V
/EN Input HIGH Voltage 2.0
/EN Input LOW Voltage
—
—
2.0
0.8
—
—
2.0
0.8
—
—
—
—
2.0
0.8
—
—
VIL
—
NOTES:
1. No output load. VCC = 5V ±10% or 3.3V ±10%
2. VOH = 5.5V.
3. IOL = +2mA.
4. VIN = 0.5V
5. VIN = 2.7V
6. VIN = VCC
3
Micrel
SY88993AV
AC ELECTRICAL CHARACTERISTICS
V
= +3.3V ±10% or +5V ±10%, R
= 50Ω to V
LOAD CC
CC
TA = –40°C
Min. Max.
TA = 0°C
TA = +25°C
TA = +85°C
Symbol
HYS
Parameter
Min.
2
Max.
8
Min.
2
Typ.
4.6
35
Max.
8
Min.
2
Max.
8
Unit
dB
LOS Hysteresis
2
8
PSRR
Power Supply(1)
Rejection Ratio
—
—
—
—
—
—
—
—
—
—
dB
tOFFL
tOFFH
LOS Release Time(2)
Minimum Input
0.5
0.5
—
—
0.5
0.5
—
—
0.1
0.1
0.5
0.5
—
—
0.5
0.5
µs
µs
LOS Release Time(2)
Maximum Input
tONL
tr, tf
LOS Assert Time(2)
—
—
0.5
—
—
0.5
—
—
0.2
60
0.5
—
—
0.5
µs
Differential Output(3)
Rise/Fall Time (20%-80%)
120
120
120
120
ps
VID
Input Voltage Range
4
1800
600
4
1800
600
4
—
1800
1200
4
1800 mVp-p
VOD
Differential Output
Voltage Swing(4)
—
—
—
800(5)
600
—
mVp-p
VSR
LOS Sensitivity Range
4
50
4
50
4
—
50
4
50
mVp-p
Output Spec (DOUT and /DOUT
)
VOH
VOL
ZO
HIGH Level Output
Voltage
VCC –20 VCC
VCC –20
—
VCC
VCC –20 VCC –5
VCC
VCC –20
—
VCC
mV
LOW Level Output(6)
ß
—
V
–300
V
–300
—
V
–400
V
–300
V
–300 mV
CC
CC
CC
CC
CC
Single-Ended Output(7)
Impedance
40
60
40
60
40
50
60
40
60
Ω
Input Spec (DIN and /DIN)
AV(Diff)
Differential Voltage
Gain
—
—
—
—
—
39
—
—
—
dB
B–3dB
S21
3dB Bandwidth
—
—
—
—
—
—
—
2.5
33
—
—
—
—
—
GHz
dB
Single-Ended Small
Signal-Gain
26
26
26
26
NOTES:
1. Input referred noise = RMS output noise/low frequency gain. Input referred, 55MHz.
2. Input is a 200MHz square wave, tr < 300ps, 1.8Vp-p.
3. With input signal VID > 50mVp-p with 50Ω load.
4. Input is a 200MHz square wave, tr < 300ps, 50Ω load.
5. VID > 5mVp-p.
6. Output levels are based on 50Ω impedance. If the load impedance is different, the output level will be changed.
7. See output structure.
4
Micrel
SY88993AV
PERFORMANCE CURVE
LOS Assert and Deassert
LOS Assert and Deassert
Levels vs LOSLVL
Levels vs LOSLVL
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
3.3V
5.0V
TA = 25°C
TA = 25°C
2.5Gbps
2.5Gbps
Pattern 223-1
Pattern 223-1
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)
LVL
CC
LVL CC
Figure 4.
Figure 5.
LOS Assert and Deassert
Levels vs LOSLVL
LOS Assert and Deassert
Levels vs LOSLVL
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
3.3V
5.0V
TA = 25°C
T
A = 25°C
2.5Gbps
2.5Gbps
Pattern 27-1
Pattern 27-1
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)
CC
LOS
= V – V (V)
CC
LVL
LVL
Figure 6.
Figure 7.
5
Micrel
SY88993AV
APPLICATION NOTE
VCC
Output Termination
VCC
The SY88993AV outputs must be terminated with a 50Ω
load to VCC.
50Ω
50Ω
50Ω
50Ω
Z0 = 50Ω
Layout and PCB Design
DOUT
Since the SY88993AV 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 power
supply.
/DOUT
Z0 = 50Ω
The SY88993AV 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.
16mA
VCC
ESD STRUCTURE
GND
ESD STRUCTURE
Figure 2. Differential Output Configuration
22nF
22nF
DIN
VCC
/DIN
R1
LOSLVL
VREF
R2
0.1µF
GND
VREF
Figure 1. Differential Input Configuration
NOTES:
1. Resistor Divider = R2/ (R1 + R2)
2. R1 + R2 ≥ 5kΩ
Figure 3. LOSLVL Circuit
PRODUCT ORDERING CODE
Ordering
Code
Package
Type
Operating
Range
SY88993AVKC
K10-1
Commercial
6
Micrel
SY88993AV
APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION
GBIC Terminal
0.01µF
0.01µF
Ω
200
Ω
68
0.01µF
0.01µF
200Ω
68Ω
50Ω
50Ω
Laserdiode
Photodiode
1000pF
7
Micrel
SY88993AV
10 LEAD MSOP (K10-1)
Rev. 00
8
Micrel
SY88993AV
MICREL-SYNERGY 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA
TEL + 1 (408) 980-9191 FAX + 1 (408) 914-7878 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
9
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