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參數(shù)資料
| 型號： | GS9025A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Serial Digital Receiver |
| 中文描述： | 串行數(shù)字接收機(jī) |
| 文件頁數(shù)： | 16/18頁 |
| 文件大?。?/td> | 192K |
| 代理商： | GS9025A |
GENNUM CORPORATION
522 - 75 - 00
16
G
10. I/O DESCRIPTION
10-1. High Speed Analog Inputs (SDI/SDI)
SDI/SDI are high impedance inputs which accept
differential or single-ended input drive.
Figure 26 shows the recommended interface when a single-
ended serial digital signal is used.
Fig. 26
10-2. High Speed Digital Inputs (DDI/DDI)
DDI/DDI are high impedance inputs which accept
differential or single-ended input drive. Two conditions must
be observed when interfacing to these inputs:
1. Input signal amplitudes are between 200 and 2000 mV
2. The common mode input voltage range is as specified
in the DC Characteristics table.
Commonly used interface examples are shown in Figures
27 to 29.
Figure 27 illustrates the simplest interface to the GS9025A
digital inputs. In this example, the driving device generates
the PECL level signals (800mV amplitudes) having a
common mode input range between 0.4 and 4.6V. This
scheme is recommended when the trace lengths are less
than 1in. The value of the resistors depends on the output
driver circuitry.
Fig. 27
When trace lengths become greater than 1in, controlled
impedance traces should be used. The recommended
interface is shown in Figure 29. In this case, a parallel
resistor (R
LOAD
) is placed near the GS9025A inputs to
terminate the controlled impedance trace. The value of
R
LOAD
should be twice the value of the characteristic
impedance of the trace. In addition, place series resistors
(R
SOURCE
) near the driving chip to serve as source
terminations. They should be equal to the value of the trace
impedance. Assuming 800mV output swings at the driver,
R
LOAD
= 100
, R
SOURCE
= 50
and Z
O
= 50
.
Fig. 28
Figure 29 shows the recommended interface when the
GS9025A digital inputs are driven single-endedly. In this
case, the input must be AC-coupled and a matching
resistor (Z
o
) must be used.
Fig. 29
When the DDI and the DDI inputs are not used, saturate
one input of the differential amplifier for improved noise
immunity. To saturate, connect either pins 44 and 1 or pins
2 and 3 to V
CC
. Leave the other pair floating.
10-3. High Speed Outputs (SDO/SDO and SCO/SCO)
SDO/SDO and SCO/SCO are current mode outputs that
require external pullups (see Figure 30). The output signal
swings are 800mV when 75
resistors are used. To shift the
signal levels down by approximately 0.7 volts, place a
diode between V
CC
and the pullups. When the output traces
are longer than 1in, use controlled impedance traces. Place
the pullup resistors at the end of the output traces as they
terminate the trace in its characteristic impedance (75
).
Fig. 30
SDI
GS9025
SDI
75
10nF
10nF
75
113
DDI
DDI
GS9025
DDI
DDI
R
SOURCE
R
LOAD
R
SOURCE
Z
O
Z
O
GS9025
DDI
DDI
Z
O
GS9025
V
CC
SDO
SDO
SCO
SCO
75
75
V
CC
75
75
GS9025
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