SY88893VKCTR [MICREL]
3.3V/5V 155Mbps PECL LOW-POWER LIMITING POST AMPLIFIER W/TTL SIGNAL DETECT; 3.3V / 5V 155Mbps的PECL低功率限幅后置放大器W / TTL信号检测
| 型号： | SY88893VKCTR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 3.3V/5V 155Mbps PECL LOW-POWER LIMITING POST AMPLIFIER W/TTL SIGNAL DETECT |
| 文件： | 总8页 (文件大小：61K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3.3V/5V 155Mbps PECL LOW-POWER
LIMITING POST AMPLIFIER W/TTL
SIGNAL DETECT
SY88893V
DESCRIPTION
FEATURES
■ Single 3.3V or 5V power supply
■ Up to 155Mbps operation
The SY88893V 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 SY88893V
quantizes these signals and outputs PECL level waveforms.
■ Low noise PECL data outputs
■ Chatter-free TTL Signal Detect (SD) output
■ TTL EN input
■ Programmable SD level set (SD
)
The SY88893V operates from a single +3.3V or +5V
power supply, over temperatures ranging from –40°C to
+85°C. With its wide bandwidth and high gain, signals with
data rates up to 155Mbps and as small as 5mVp-p can be
amplified to drive devices with PECL inputs.
LVL
■ Available in tiny 10-pin MSOP (3mm × 3mm) package
The SY88893V generates a TTL SD output. A
programmable signal-detect level set pin (SD ) sets the
LVL
sensitivity of the input amplitude detection. SD asserts high
APPLICATIONS
if the input amplitude rises above the threshold set by SD
LVL
and deasserts low otherwise. EN deasserts the true output
signal without removing the input signal. Typically 6dB SD
hysteresis is provided to prevent chattering.
■ 155Mbps SONET/SDH
■ Small form factor transceivers
■ High-gain line driver and line receiver
TYPICAL APPLICATIONS CIRCUIT
VCC
SD
EN
DIN
DOUT
0.1µF
0.1µF
0.1µF
0.1µF
From
Transimpedance
Amp.
To
CDR
/DIN
/DOUT
SY88893V
SDLVL
VREF
50Ω
50Ω
Rpd
Rpd
VCC
GND
GND
0.1µF
100kΩ
For 3.3V, Rpd = 120Ω
For 5V, Rpd = 220Ω
Rev.: B
Amendment: /0
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
Issue Date: August 2005
1
SY88893V
Micrel, Inc.
PACKAGE/ORDERING INFORMATION
Ordering Information
EN
DIN
1
2
3
4
5
10 VCC
9
8
7
6
DOUT
Package
Operating
Range
Package
Marking
Lead
Finish
Part Number
Type
K10-1
K10-1
K10-1
/DIN
/DOUT
SD
SY88893VKC
SY88893VKCTR(1)
SY88893VKG
Commercial
Commercial
Industrial
893V
893V
Sn-Pb
Sn-Pb
VREF
SDLVL
GND
893V with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
10-Pin MSOP
(K10-1)
SY88893VKGTR(1)
K10-1
Industrial
893V with
Pb-Free bar-line indicator
Pb-Free
NiPdAu
Note:
1. Tape and Reel.
PIN DESCRIPTION
Pin Number
Pin Name
Type
Pin Function
1
EN
TTL Input:
Enable: Deasserts true data output when high.
Default is high.
2
3
4
5
DIN
/DIN
Data Input
Data Input
True data input.
Complementary data input.
VREF
SDLVL
Reference voltage.
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 6.75kΩ
pullup 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.
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
2
SY88893V
Micrel, Inc.
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (V ) ....................................... 0V to +7.0V
Supply Voltage (V ) .............................. +3.0V to +3.6V or
CC
CC
............................................................ +4.5V to +5.5V
Input Voltage (D , /D ) .........................................0 to V
IN
IN
CC
Ambient Temperature (T ), Note 3 ............ –40°C to +85°C
Output Current (I
)
A
OUT
Continuous .............................................................50mA Junction Temperature (T ), Note 3 .......... –40°C to +120°C
J
Surge.................................................................... 100mA
Package Thermal Resistance
MSOP
EN Voltage .............................................................0 to V
CC
(θ ) Still-Air .................................................. 113°C/W
V
Current ......................................... –800µA to +500µA
JA
REF
(ψ ) Still-Air.................................................... 74°C/W
JB
SD
Voltage ................................................. V
to V
LVL
REF CC
Storage Temperature (T ) ....................... –55°C to +125°C
S
DC ELECTRICAL CHARACTERISTICS
VCC = 3.0V to 3.6V or 4.5V to 5.5V; RLOAD = 50Ωto VCC–2V; TA = –40°C to +85°C; typical values at VCC = 3.3V, TA = 25°C
Symbol
ICC
Parameter
Condition
Min
Typ
Max
42
Units
mA
V
Power Supply Current
SDLVL Voltage
no output load
25
SDLVL
VIH
VREF
2.0
VCC
EN Input HIGH Voltage
EN Input LOW Voltage
EN Input HIGH Current
V
VIL
0.8
V
IIH
VIN = 2.7V
VIN = VCC
20
100
µA
µA
IIL
EN Input LOW Current
SD Output HIGH Level
VIN = 0.5V
–0.3
mA
VOH
VCC ≥ 3.3V
2.4
2.0
V
V
VCC < 3.3V
VOL
SD Output LOW Level
PECL Output HIGH Voltage
PECL Output LOW Voltage
Differential Output Offset
Common Mode Range
Reference Voltage
IOL = +2mA
0.5
V
V
VOH
50Ωto VCC–2V output load
50Ωto VCC–2V output load
VCC–1.085 VCC–0.955 VCC–0.880
VCC–1.830 VCC–1.705 VCC–1.555
±100
VOL
V
VOFFSET
VIHCMR
VREF
mV
V
Note 4
Note 5
GND +1.7
VCC
VCC–1.38 VCC–1.32 VCC–1.26
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. Commercial devices are guaranteed from 0°C to +85°C ambient temperature.
4. The V
range is referenced to the most positive side of the differential input signal.
IHCMR
5. The current provided into or from V
must be limited to 800µA source and 500µA sink.
REF
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
3
SY88893V
Micrel, Inc.
AC ELECTRICAL CHARACTERISTICS
VCC = 3.0V to 3.6V or 4.5V to 5.5V; RLOAD = 50Ω to VCC–2V; TA = –40°C to +85°C; typical values at VCC = 3.3V, TA = 25°C
Symbol
HYS
tOFF
Parameter
Condition
Min
Typ
4.6
0.1
0.2
Max
Units
dB
SD Hysteresis
SD Release Time
SD Assert Time
electrical signal
2
8
0.5
µs
tON
0.5
µs
tr,tf
Differential Output Rise/Fall Time
(20% to 80%)
1000
ps
VID
Differential Input Voltage Swing
Differential Output Voltage Swing
5
5
1800
50
mVPP
VOD
V
ID ≥ 18mVPP
1500
400
mVPP
mVPP
VID = 5mVPP
VSR
SD Sensitivity Range
Differential Voltage Gain
3dB Bandwidth
mVPP
dB
AV(Diff)
B–3dB
S21
38
32
200
26
MHz
dB
Single-Ended Small-Signal Gain
TYPICAL OPERATING CHARACTERISTICS
SD Assert and Deassert
SD Assert and Deassert
Levels vs. SD
Levels vs. R
LVL
SDLVL
120
140
120
100
80
VSUP = 3.3V
TA = 25°C
VSUP = 3.3V
TA = 25°C
100
155Mbps
155Mbps
Pattern 223–1
80
60
40
20
0
Pattern 223–1
ASSERT
ASSERT
60
40
DEASSERT
20
DEASSERT
0
0
0.2 0.4 0.6 0.8
1
1.2 1.4
SD (referenced to V ) (V)
LVL
CC
R
(Ω)
SDLVL
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
4
SY88893V
Micrel, Inc.
DETAILED DESCRIPTION
Signal-Detect Level Set
The SY88893V low-power limiting post amplifier operates
from a single +3.3V or +5V power supply, over temperatures
from –40°C to +85°C. Signals with data rates up to 155Mbps
A programmable signal-detect level set pin (SD ) sets
the threshold of the input amplitude detection. Connecting
an external resistor between V and SD
LVL
and as small as 5mV can be amplified. Figure 1 shows
sets the voltage
PP
CC
LVL
the allowed input voltage swing. The SY88893V generates
at SD . This voltages ranges from V
to V
. The
REF
LVL
CC
an SD output. SD
amplitude detection.
sets the sensitivity of the input
external resistor creates a voltage divider between V and
LVL
CC
V
as shown in Figure 5. If desired, an appropriate external
REF
voltage may be applied rather than using a resistor. The
smaller the external resistor, implying a smaller voltage
Input Amplifier/Buffer
Figure 2 shows a simplified schematic of the SY88893V's
input stage. The high-sensitivity of the input amplifier allows
signals as small as 5mVp-p to be detected and amplified.
The input amplifier allows input signals as large as
difference from SD
to V , the smaller the SD sensitivity.
LVL
CC
Hence, larger input amplitude is required to assert SD.
“Typical Operating Characteristics” shows the relationship
between the input amplitude detection sensitivity and the
1800mV . Input signals are linearly amplified with a typically
PP
SD
voltage.
LVL
38dB differential voltage gain. Since it is a limiting amplifier,
Hysteresis
the SY88893V outputs typically 1500mV voltage-limited
PP
waveforms for input signals that are greater than 18mV
.
The SY88893V provides typically 6dB SD electrical
hysteresis. By definition, a power ratio measured in dB is
PP
Applications requiring the SY88893V to operate with high-
gain should have the upstream TIA placed as close as
possible to the SY88893V’s input pins to ensure the best
performance of the device.
2
10log(power ratio). Power is calculated as V /R for an
IN
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 datasheet. The SY88893V provides typically 3dB SD
optical hysteresis. As the SY88893V is an electrical device,
this datasheet refers to hysteresis in electrical terms. With
6dB SD hysteresis, a voltage factor of two is required to
assert or de-assert SD.
Output Buffer
The SY88893V’s PECL output buffer is designed to drive
50Ω lines. The output buffer requires appropriate termination
for proper operation. An external 50Ω resistor to V –2V
CC
for each output pin provides this. Figure 3 shows a simplified
schematic of the output stage and includes an appropriate
termination method.
Signal-Detect
The SY88893V generates a chatter-free SD open-collector
TTL output with internal 6.75kΩ pullup 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
SD
and deasserts low otherwise. SD can be fed back to
LVL
the enable (EN) input to maintain output stability under a
loss of signal condition. EN deasserts the true output signal
without removing the input signals. Typically 6dB SD
hysteresis is provided to prevent chattering.
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
5
SY88893V
Micrel, Inc.
DATA+
2.5mV (Min.)
900mV (Max.)
VIS(mVp-p)
VID(mVp-p)
DATA—
(DATA+) — (DATA—)
5mVp-p (Min.)
1800mVp-p (Max.)
Figure 1. V and V Definitions
IS
ID
VCC
VCC
ESD
STRUCTURE
DOUT
/DOUT
DIN
/DIN
ESD
STRUCTURE
GND
GND
Figure 2. Input Structure
Figure 3. Output Structure
VCC
RSDLVL
VCC
SDLVL
6.75kΩ
SD
3kΩ
VREF
SY88893V
Figure 4. SD Output Structure
Figure 5. SD
Setting Circuit
LVL
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
6
SY88893V
Micrel, Inc.
FUNCTIONAL BLOCK DIAGRAM
DOUT
DIN
Limiting
Amplifer
PECL
Buffer
/DIN
/DOUT
VREF
VCC
Enable
EN
SD
Level
Detect
GND
SDLVL
DESIGN PROCEDURE
Layout and PCB Design
The SY88893V’s 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.
Since the SY88893V is a high-frequency component,
performance can be largely determined by the board layout
and design. A common problem with high-gain amplifiers is
the feedback from the large swing outputs to the input via
the power supply.
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
7
SY88893V
Micrel, Inc.
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 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.
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
8
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