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| 型號： | AD1970 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Digital BTSC Encoder with Integrated ADC and DAC |
| 中文描述： | 數(shù)字廣播電視系統(tǒng)委員會編碼器與集成ADC和DAC |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 278K |
| 代理商： | AD1970 |
AD1970
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Rev. 0 | Page 7 of 20
NC = NO CONNECT
AD1970
TOP VIEW
(Not to Scale)
DVDD
1
RESETB
2
DGND
3
DVDD
4
RSVD
5
DGND
GPIO1
GPIO0
XIN
XOUT
36
35
34
33
32
VOUT_OAMP
6
VIN_OAMP
7
AVDD
8
BTSC_OUT
9
AGND
10
VREF
11
FILTCAP
12
VID_PRES
MCLK
PLL_MODE1
PLL_MODE0
NC
31
30
29
28
27
VID_IN
PGND
26
25
A
13
A
14
V
15
V
16
V
17
V
18
C
19
C
20
C
21
C
22
P
23
P
24
D
A
A
S
S
48
47
46
45
44
D
L
B
S
G
43
42
41
40
39
G
D
38
37
0
Figure 2. Pin Configuration
Table 13. Pin Function Descriptions
Pin No.
Pin Name
1
DVDD
2
RESETB
Input/Output
IN
Description
Digital Power.
Reset—Active Low. After RESETB transitions from low to high, the AD1970 BTSC encoder
core goes through an initialization sequence where all registers are set to 0. The
initialization is completed after 1024 MCLK cycles. New values should not be written to
the control port until the initialization is complete.
Digital Ground.
Digital Power. 3.3 V nominal.
Reserved—Connect to DGND.
Output voltage of internal op amp to be used for BTSC output low pass filter.
Negative input of internal op amp to be used for BTSC output low pass filter.
Analog Power.
Encoded BTSC Output. The nominal output voltage for a 300 Hz, 0 dB mono input signal is
250 mV rms.
Analog Ground.
Connection for voltage reference noise reduction capacitor. The nominal VREF voltage is
1.5 V; the analog gain scales directly with the voltage on this pin. Any ac signal on this pin
causes distortion and therefore a large decoupling capacitor should be used to ensure the
voltage on VREF is clean.
Connection for DAC noise reduction capacitor. A 10 μF capacitor should be connected to
this pin to reduce the noise on an internal DAC biasing point to provide the highest
performance. It may not be necessary to connect this pin, depending on the quality of the
layout and grounding used in the application circuit.
Analog Power. 3.3 V nominal. Bypass capacitors should be placed close to the pins and
connected directly to the analog ground plane.
Analog Ground.
Output of internal op amp for left channel input amplifier.
Negative input of internal op amp for left channel input amplifier.
Output of internal op amp for right channel input amplifier.
3
4
5
6
7
8
9
DGND
DVDD
RSVD
VOUT_OAMP
VIN_OAMP
AVDD
BTSC_OUT
OUT
IN
OUT
10
11
AGND
VREF
OUT
12
FILTCAP
OUT
13
AVDD
14
15
16
17
AGND
VOUT_IAMPL
VIN_IAMPL
VOUT_IAMPR
OUT
IN
OUT
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