參數(shù)資料
型號(hào): TWL1110PBSR
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP32
封裝: PLASTIC, QFP-32
文件頁數(shù): 17/40頁
文件大?。?/td> 564K
代理商: TWL1110PBSR
TWL1110
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS103 – NOVEMBER 2000
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
receive operation (continued)
Table 6. Receive-Data Bit Definitions
BIT NO.
COMPANDED
MODE
LINEAR
MODE
1
CD7
LD14
2
CD6
LD13
3
CD5
LD12
4
CD4
LD11
5
CD3
LD10
6
CD2
LD9
7
CD1
LD8
8
CD0
LD7
9
LD6
10
LD5
11
LD4
12
LD3
13
LD2
14
LD1
15
LD0
16
––
Transmit channel gain control bits always follow the PCM data in time:
CD7-CD0 = data word in companded mode
LD14-LD0 = data word in linear mode
DTMF generator operation and interface
The DTMF circuit generates the summed DTMF tones for push button dialing and provides the PDM output for
the BUZZCON user-alert tone. The integer value is determined by the formula round tone [Freq (Hz)/resolution
(Hz)]. The integer value is loaded into one of two 8-bit registers, high tone register (04) or low tone register (05).
The tone output is 2 dB higher when applied to the high tone register (04). When generating DTMF tones, the
high frequency value must be applied to the high tone register (04) and the low DTMF value to the low tone
register.
The DTMF frequency resolution is controlled by the auxiliary register (06) bits 2, 3, 4, and 5. When the resolution
is set to 7.8125 Hz, the frequency range can be up to 1992.2 Hz. A wider range can be accomplished (for
example, 2x or 4x) by selecting lower resolutions of 15.625 Hz or 31.250 Hz. The gain setting is controlled by
the RXPGA gain control. This register applies the required gain to obtain MUX control during tone mode
operation. Table 3 shows the relationship of the two gain settings.
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