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參數(shù)資料
型號(hào): PCD5096H
廠商: NXP SEMICONDUCTORS
元件分類: 編解碼器
英文描述: Universal codec
中文描述: A/MU-LAW, PCM CODEC, PQFP44
封裝: 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44
文件頁數(shù): 17/52頁
文件大小: 222K
代理商: PCD5096H
1997 Jan 22
17
Philips Semiconductors
Preliminary specification
Universal codec
PCD5096
8.3.5
C
ONTROL
R
EGISTER
3 (CR3)
This 16-bit register is used to adjust the reference voltage of Codec 1 and Codec 2 to 2000 mV. An accuracy of 12 mV
is guaranteed. The equation for determining the reference voltage (VREFn) for each codec is given below:
Where ‘n’ is the codec number and can take a value of ‘1’ or ‘2’. The default value for VBGP is 1.25 V but this may vary
due to process spread (see Chapter 16). Note that increasing RVnREF reduces VREFn.
For correct function of the analog blocks, care must be taken to have sensible values in CR3. For example, bits (15:14),
as well as (7:6) must be ‘10’. The state of this register after reset is A0A0H.
Table 16
Control Register 3 (address 78H)
Table 17
Control Register 3 (continued)
Table 18
Description of CR2 bits
15
14
13
12
11
10
9
8
1
0
RV2REF5
RV2REF4
RV2REF3
RV2REF2
RV2REF1
RV2REF0
7
6
5
4
3
2
1
0
1
0
RV1REF5
RV1REF4
RV1REF3
RV1REF2
RV1REF1
RV1REF0
BIT
SYMBOL
RV2REF5
RV2REF4
RV2REF3
RV2REF2
RV2REF1
RV2REF0
RV1REF5
RV1REF4
RV1REF3
RV1REF2
RV1REF1
RV1REF0
DESCRIPTION
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
This bit must be set to a logic 1.
This bit must be set to a logic 0.
These 5 bits are used to select the reference voltage of Codec 2.
This bit must be set to a logic 1.
This bit must be set to a logic 0.
These 5 bits are used to select the reference voltage of Codec 1.
VREFn
RVnREF
VBGP
×
256
=
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