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| 型號： | DRX3960A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Digital Receiver Front-end |
| 中文描述： | 數(shù)字接收機(jī)前端 |
| 文件頁數(shù)： | 21/30頁 |
| 文件大?。?/td> | 450K |
| 代理商： | DRX3960A |
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ADVANCE INFORMATION
DRX 3960A
Micronas
21
5.3. Pin Descriptions
Pin 1,
AVSS_ADC
Analog ground for ADC
Pin 2,
AVDD_ADC
Analog supply for ADC
This pin must be connected to 5 V.
Pin 3,
ANATSTX
Reserved for test
This pin should be connected to analog ground.
Pin 4,
ANATSTY
Reserved for test
This pin should be connected to analog ground.
Pin 5,
AVDD_FE8
Analog supply for analog front-
end This pin must be connected to 5 V.
Pin 6,
AVSS_FE8
Analog ground for analog front-
end
Pin 7,
AVSS_FE40
Analog ground for IF input cir-
cuitry.
The layout of the IF input should be symmetrical with
respect to AVDD_FE40.
Pin 8,
IFINX
Balanced IF input X
This pin must be connected to SAW output. SAW has
to be placed as close as possible. The layout of the IF
input should be symmetrical with respect to
AVDD_FE40.
Pin 9,
AVDD_FE40
Analog supply for IF input cir-
cuitry
This pin must be connected to 5 V. The layout of the IF
input should be symmetrical with respect to
AVDD_FE40.
Pin 10,
IFINX
Balanced IF input Y
This pin must be connected to SAW output. SAW has
to be placed as close as possible. The layout of the IF
input should be symmetrical with respect to
AVDD_FE40.
Pin 11,
AVSS_FE40
Analog ground for IF input cir-
cuitry
The layout of the IF input should be symmetrical with
respect to AVDD_FE40.
Pin 12,
AVDD_SYN
Analog supply for clock synthe-
sizer. This pin must be connected to 5 V.
Pin 13,
AVSS_SYN
Analog ground for clock synthe-
sizer.
Pin 14,
SHIELD
Analog ground for shielding analog
from digital part.
Pin 15,16,17,
TEST0 1 2
Pins for factory test
Pin 18,
CVBS
Video output
Output level is set via I
2
C-Bus. An appropriate video
processor (e.g. VPC etc.) has to be connected to that
pin.
Pin 19,
REF_SW
Reference frequency switch. This
input defines the default setting of the reference divider
after POR. For 20.25 MHz applications it has to be
connected to ground, for applications with higher fre-
quencies than 20.25 MHz it must be connected to
3.3 V.
Pin 20,
SIF
2nd sound IF ouput
Output level is set via I2C-Bus. An appropriate sound
processor (e.g. MSP) has to be connected to that pin.
Pin 21,
AVDD_DAC
Analog supply for the analog
output DACs
This pin must be connected to 5 V.
Pin 22,
AVSS_DAC
Analog Ground for the analog
output DACs
This pin must be connected to ground.
Pin 23,
TEST_EN
Test Enable pin
This pin enables factory test modes. For normal opera-
tion it must be connected to ground.
Pin 24,
RESET
Reset input
For normal operation, a high level is required. A low
level resets the DRX 3960A.
Pin 25, 26,
I2C_SDA, I2C_SCL
I2C control bus data
and clock
Pin 27,
DVDD_CAP
Digital supply pin
This pin has to be connected to 3.3 V according to the
application circuit.
Pin 28,
DVDD
Digital supply pin
This pin has to be connected to 3.3 V according to the
application circuit.
Pin 29,
DVSS
Digital ground pin
This pin has to be connected to digital ground accord-
ing to the application circuit.
Pin 30,
DVSS_CAP
Digital ground pin
This pin has to be connected according to the applica-
tion circuit.
Pin 31, 32, 34, 35, 36, 38,
PORT0 1 2 3 4 5
General
purpose output ports
Their states are controlled via I2C bus.
Pin 33,
TUNER_AGC
This pin controls the delayed
tuner AGC. As it is a noise-shaped-I-DAC output, it has
to be connected according to the application circuit.
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