Instrukcja obsługi Microchip SY88773V

Microchip nieskategoryzowany SY88773V

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1
M9999-051304
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
Rev.: A Amendment: /0
Issue Date: May 2004
FEATURES
The SY88773V features:
■Multirate up to 3.2Gbps operation
■Wide gain-bandwidth product
■Low-noise 50 Ω CML data outputs
■Chatter-free Loss-of-Signal (LOS) output
■Programmable LOS sensitivity
■On-chip input bias for AC-coupled applications
■TTL /EN input
■Wide power supply and temperature operating
range
The SY88773V evaluation board features:
■AC-coupled I/O with SMA connectors
■Single potentiometer to set LOS LVL
■SMA or test points available to measure non-
critical nodes
AVAILABLE MEASUREMENTS
The SY88773V evaluation board allows the following
measurements:
■Frequency performance
■Output eye pattern generation
■Mask testing
■Jitter
■Output rise/fall time
■BER testing
■Hysteresis measurement
EVALUATION BOARD
The SY88773V low-power limiting post amplifier is designed
for use in fiber-optic receivers. The device connects to typical
transimpedance ampliers (TIAs). The linear signal output
from TIAs can contain significant amounts of noise and may
vary in amplitude over time. The SY88773V quantizes these
signals and outputs typically 800mVppvoltage-limited
waveforms.
The SY88773V operates from a single +3.3V 10% or±
+5V ±10% power supply, over an industrial temperature
range of –40 C to +85 C. With its wide bandwidth and high° °
gain, signals with data rates up to 3.2Gbps and as small as
10mVp-p can be amplified to drive devices with CML or PECL
inputs.
The SY88773V incorporates a loss-of-signal (LOS) open-
collector TTL output with internal 5k pull-up resistor. AΩ
programmable loss-of-signal level set pin (LOSLVL) sets the
sensitivity of the input amplitude detection. LOS asserts
high if the input amplitude falls below the threshold set by
LOSLVL and deasserts low otherwise. LOS can be fed back
to the enable (/EN) input to maintain output stability under a
loss of signal condition. /EN deasserts the true output signal
without removing the input signal. Typically, 4.6dB LOS
hysteresis is provided to prevent chattering.
This manual provides information on the SY88773V
evaluation board. It should be used in conjunction with the
SY88773V data sheet, which contains full specications of
the SY88773V.
The SY88773V evaluation board enables fast and thorough
evaluation of the SY88773V 3.2Gbps CML low-power limiting
post amplier. The board is an easy-to-use, 4-layer high-
speed coplanar design. It is designed to be driven by a high-
speed 3.2Gbps pattern generator.
The SY88773V evaluation board is intended to be
terminated to a 50 scope and provides for simple userΩ
adjustability of the LOS threshold through the adjustment of
an on-board potentiometer. This allows the user to evaluate
various parameters of the SY88773V, as listed in the
“Available Measurements” section of this document.
Figure 1. SY88773V Evaluation Board
3.3V/5V 3.2Gbps CML
LOW-POWER LIMITING POST
AMPLIFIER w/ TTL LOS
SY88773V
EVALUATION BOARD
Layer Definition
1 Signal/GND
2 GND
3 VCC
4 GND
Table 1. SY88773V Evaluation Board Layer Stack-Up
2
SY88773V
EVALUATION BOARD
Micrel
M9999-051304
hbwhelp@micrel.com or (408) 955-1690
MEASUREMENT SETUP
Agilent
E3620A
Power
Supply
+
-
+
-
Agilent
83752A
Synthesized
Sweeper
RFOut
Agilent
70843B
Error
Performance
Analyzer
Clock
Input
Data
Out
/Data
Out
Trigger
Out
+–
Tektronix
DMM157
Multimeter
Agilent
70004A
Display
Trigger
In
CH1
Agilent
86100A
Wide-Bandwidth
Oscilloscope
CH2
DIN DOUT
/DOUT/DIN
GND
LOSLVL
VCCVCC
GND
6
7
8
VREF
LOS
VCC
GND
GND
VCC
/EN
2
3
49
10
11
12
16
15
14
13
1
5
SY88773V
TP2
V
CC
TP3
C3
0.1 Fµ
C4
1 Fµ
C5
0.1 Fµ
C6
1 Fµ
C2
0.1 Fµ
C1
0.1 Fµ
S1
S2
C13
0.1 Fµ
C14
1 Fµ
C11
0.1 Fµ
C12
1 Fµ
C15
0.1 Fµ
C10
0.1 Fµ
C9
0.1 Fµ
S5
S4
C7
0.1 Fµ
C8
1 Fµ
S3
S6
VAR1
250kΩ
BP1
BP2
TP1
C40
0.1 Fµ
C41
10 Fµ
U1
R1
49.9Ω
R2
49.9Ω
V
REF
R
FDBK
(optional)
V
CC
V
REF
V
CC
V
CC
V
CC
Figure 2. Setup for Measurements
Equipment used for measurements:
1. Agilent 83752A Synthesized Sweeper
2. Agilent 70004A Display
3. Agilent 70843B Error Performance Analyzer
4. Agilent 86100A Wide-Bandwidth Oscilloscope
5. Two (2) MCL BW S15W2 40dB Attenuators
6. Agilent E3620A DC Power Supply
7. Tektronix DMM157 Multimeter
8. Matched High-Speed Cables w/SMA Connectors
Note:
Items 1 through 3 constitute the BERT stack.
3
SY88773V
EVALUATION BOARD
Micrel
M9999-051304
hbwhelp@micrel.com or (408) 955-1690
SETUP FOR MEASUREMENTS
This section explains how to connect and setup the
SY88773V evaluation board per Figure 2. Ensure proper
ESD precautionary measures are taken before handling
sensitive electronic equipment, including the SY88773V
evaluation board.
1. Set E3620A output to 3.3V and then turn o
E3620A. Connect E3620A s positive lead to V’CC
post, negative lead to GND post.
2. Configure Agilent BERT stack:
a. Set the 83752A Synthesized Sweeper to 2.5GHz.
b. From the 70004A’s Pattern menu, choose
the PRBS 231–1 pattern.
c. From the 70004A’s Trigger menu:
i. Choose clock as trigger output
ii. Choose CLK/8 for divider
d. From the 70004A’s Data menu:
i. External Termination = DC termination 0V
ii. Attenuation = 40dB
iii. Amplitude = 5mV (10mVpp)
iv. Hi-Level = 0V
v. Tracking = ON
vi. Polarity = NORMAL
vii. Data Output = ON
viii. Crossing = 0
3. Connect 70843V’ ’s trigger output to 86100A s trigger
input.
4. Short /EN to GND by shorting S6 to GND.
a. DOUT will be stuck low if this is not done
5. Connect DIN and /DIN (S1 and S2) on SY88773V
evaluation board to 70843V s data outputs through’
40dB attenuators.
a. Connect 40dB attenuators directly to the board
rather than the 70843V s data outputs to allow a’
larger and cleaner signal to pass through the
connecting SMA cables.
6. Connect DOUT and /DOUT (S5 and S4) on
SY88773V evaluation board to 86100A s inputs.’
7. Set DMM157 to display voltage. Connect positive
lead to SD (S3) and connect negative lead to GND.
8. Turn on E3620A. Typical power supply current
should be ~45mA. Excessive current usually means
the power supply leads have been connected
backwards. Be careful of this!
9. Configure 86100A oscilloscope.
a. Verify a trigger signal is present by checking
that the Trigger Source button is lit.
i. Depress this button to choose external
source if necessary.
ii. Adjust trigger level if necessary.
b. Press Eye/Mask Mode on front panel.
c. Choose NRZ Eye Measurements from on-
screen display.
d. Choose RMS Jitter, Rise Time, Fall Time and
Eye Amplitude Measurements from on-screen
selection list.

Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: SY88773V

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