STV1602A Просмотр технического описания (PDF) - STMicroelectronics
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STV1602A Datasheet PDF : 22 Pages
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STV1602A
Figure 10
-5V
10/16V
0.1
0.1
2 24 27 30 23 8 7
GND
22 RSE
VEE
FREQUENCY
MONITOR
V1
33 DIX
1kΩ
34 DIY STV1602A PCX 19
-5V
1 ESO
0.1
-5V
37 ESI
ADS
FV QSW TN1
32
36
5
6
10kΩ
-5V
22kΩ 10µF/16V
-5V
SW3
STV1602A GENERAL
As shown in the overall block diagram on page 7,
STV1602Ais composed of the following functions :
(1) Analog input as a primary input with automatic
equalizer to meet the loss characteristics of
coaxial cable
(2) Digital input as a secondary input to receive
the encodedsignal from short distances within
the same printed circuit board or the same
equipment
(3) Phase locked loop (PLL) variable oscillator
(4) Reclocked serial output
(5) Serial descrambler
(6) SYNC detector
(7) Deserializer
(8) Parallel output buffer amplifiers
(9) Three diagnostic signals : eye monitor, SYNC
monitor and input data presence monitor
A brief explanation of each function is given in the
following sections.
1. Cable equalizer
Transmission of high speed digital data by means
of coaxial cable can greatly attenuate high fre-
quency components.According to the cable length,
received signals can widely differ from those sent;
in such conditions, clock extraction and data iden-
tification could be difficult.
The cable equalizer overcomes this problem.
The IC performs up to 30dB (typical) equalization
at 135MHz, typically 300m of high-grade coaxial
cable. The equalization is automatically performed
according to the coaxial cable length.
The input signal can be delivered either through a
transformer or through a capacitor.
When the digital input is selected, the equalizer is
disabled. Typical characteristics of the equalization
are given in Figure 31.
Figure 11 : Equalizer Capacitor Coupling Input
Circuit
Monitor
OUT
100Ω
31 MON
30 GND
Serial
IN
75Ω
10µF
47pF
29 CX STV1602A
26 AIX
25 AIY
47pF
14/22
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