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參數(shù)資料
| 型號： | PCD5032T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 編解碼器 |
| 英文描述： | ADPCM CODEC for digital cordless telephones |
| 中文描述： | ADPCM CODEC, PDSO28 |
| 封裝： | 7.50 MM, PLASTIC, MS-013AE, SOT-136-1, SOP-28 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 136K |
| 代理商： | PCD5032T |
1997 Apr 03
10
Philips Semiconductors
Product specification
ADPCM CODEC for digital cordless
telephones
PCD5032
7.1.3
I
2
C-
BUS INTERFACE
The mode of operation and transmitter/receiver gain is
programmed through the I
2
C-bus serial interface.
The I
2
C-bus address of the device is shown in Fig.8.
handbook, halfpage
MGK071
0
A0
0
0
1
1
0
0
(WRITE ONLY)
Fig.8 I
2
C-bus address.
With the address select pin A0 it is possible to have two
independently programmed PCD5032 CODECs in a base
station (two outside lines). If more CODECs are used in a
base station then the address pin can be used as a select
signal. Detailed description of the I
2
C-bus specification is
given in the brochure “The I
2
C-bus and how to use it” This
may be ordered using the code 9398 393 40011.
Each function can be accessed by writing one 8-bit word
to the ADPCM CODEC. For this reason the 8-bit word is
divided into two fields:
bit 7, bit 6: function
bit 5 to bit 0: value/setting.
Table 1 gives an overview of the I
2
C-bus programming
options.
Table 1
Overview of I
2
C-bus programming options
FUNCTION
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Operation mode
Receiver control
Transmitter control
Ringer
0
0
1
1
0
1
0
1
RV2
ST1
BF2
RV1
ST0
BF1
TONE
RV0
MUTE
BF0
PON
RG2
TG2
BV2
T1
RG1
TG1
BV1
T0
RG0
TG0
BV0
Table 1 definitions
:
TONE
: ‘tone/ringer’ section for tone generator output;
tones can be sent to ringer or receiver DAC
PON
: power-on (active)
T1 and T0
: test loops
RG2 to RG0
: receiver gain
TG2 to TG0
: transmitter gain
RV2 to RV0
: receiver volume
BV2 to BV0
: tone volume
BF2 to BF0
: tone frequency
ST1 to ST0
: sidetone level.
Programming the ADPCM CODEC is possible in active
mode as well as in standby mode. A reset clears all
I
2
C-bus registers.
7.1.4
F
AST MUTE
The RFM (Receiver Fast Mute) pin enables fast muting of
the received signal if erroneous data is present on the
ADPCM interface.
Muting is done in the same way as the receiver mute via
the I
2
C-bus. The input data of the ADPCM decoder is
blanked, so that the ADPCM decoder output signal goes to
zero. To ensure immediate silence on the analog outputs
RE+ and RE
, the linear PCM input data of the receive
filter is set to zero as well.
If the mute signal is switched off again, then the ADPCM
decoder output settles gradually from the zero to the
appropriate PCM signal level. No audible clicks will occur.
The sidetone level is not affected by the mute function.
7.2
Analog parts and I
2
C-bus programming
7.2.1
I
NPUT AND OUTPUT
The analog input pins TM+ and TM
can be connected
directly to a microphone. For electret microphones
capacitive coupling is required (see Chapter 12, Fig.13).
The earpiece must be a low-ohmic device (>100
differential).
The microphone and earpiece amplifiers have the
possibility of gain control via the I
2
C-bus interface. Further
the sending and receiving direction can be muted
separately. Analog gain control for the receive path can be
set in steps of 1 dB. Digital volume control can be set in
6 dB steps. Table 2 gives an overview of the gain control
options.
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