where Full Scale VPK
參數(shù)資料
型號： SI3200-KS
廠商： Silicon Laboratories Inc
文件頁數(shù)： 71/128頁
文件大小： 0K
描述： IC LINEFEED INTRFC 100V 16SOIC
標(biāo)準(zhǔn)包裝： 48
系列： ProSLIC®
功能： 用戶線路接口概念（SLIC），CODEC
接口： GCI，PCM，SPI
電路數(shù)： 2
電源電壓： 3.3V，5V
電流 - 電源： 110µA
功率（瓦特）： 941mW
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm Width）裸露焊盤
供應(yīng)商設(shè)備封裝： 16-SOIC N
包裝： 管件
包括： 電池切換，BORSCHT 功能，DTMF 生成和解碼，F(xiàn)SK 音調(diào)生成，調(diào)制解調(diào)器和傳真音調(diào)檢測
Si3232
Preliminary Rev. 0.96
47
Not
Recommended
fo
r N
ew
D
esi
gn
s
where Full Scale VPK =0.5 V.
The pulse metering oscillator has a volume envelope
(linear ramp) on the on/off transitions of the oscillator.
The ramp is controlled by the value entered into the
PMRAMP RAM address, and the sinusoidal generator
output is multiplied by this volume before being sent to
the
pulse
metering
DAC.
The
volume
value
is
incremented by the value in PMRAMP at an 8 kHz rate.
The volume ramps from 0 to 7FFF in increments of
PMRAMP, thus allowing the value of PMRAMP to set
the slope of the ramp. The clip detector stops the ramp
once the signal seen at the transmit path exceeds the
amplitude threshold set by PMAMPTH, thus providing
an automatic gain control (AGC) function to prevent the
audio signal from clipping. When the pulse metering
signal is turned off, the volume ramps down to 0 by
decrementing according to the value of PMRAMP.
Figure 24 illustrates the functional blocks involved in
pulse-metering generation, and Table 28 presents the
register and RAM locations required that must be set to
generate pulse-metering signals.
PMAMPL
1
4
--- 1coeff
–
1
coeff
+
------------------------
2
15
1
–
Desired V
PK
Full Scale V
PK
------------------------------------------
=
Table 28. Register and RAM Locations Used for Pulse Metering Generation
Parameter
Register/RAM
Mnemonic
Register/RAM
Bits
Description / Range
(LSB Size)
Pulse-Metering Frequency
Coefficient
PMFREQ
PMFREQ[15:3]
Sets oscillator frequency
Pulse-Metering Amplitude
Coefficient
PMAMPL
PMAMPL[15:0]
Sets oscillator amplitude
Pulse-Metering Attack/Decay
Ramp Rate
PMRAMP
PMRAMP[15:0]
0 to PMAMPL
(full amplitude)
Pulse-Metering Active Timer
PMTALO/PMTAHI
PULSETA[15:0]
0 to 8.19 s (125 s)
Pulse-Metering Inactive Timer
PMTILO/PMTIHI
PULSETI[15:0]
0 to 8.19 s (125 s)
Pulse-Metering,
Control Interrupt
IRQVEC1,
IRQEN1
PULSTAE,
PULSTIE,
PULSTAS,
PULSTIS
Interrupt status and control
registers
Pulse-Metering AGC
Amplitude Threshold
PMAMPTH
PMAMPTH[15:0]
0 to 500 mV
PM Waveform Present
PMCON
ENSYNC
Indicates Signal Present
PM Active Timer Enable
PMCON
TAEN1
Enable/disable
PM Inactive Timer Enable
PMCON
TIEN1
Enable/disable
Pulse-Metering Enable
PMCON
PULSE1
Enable/disable
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