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參數(shù)資料
| 型號： | AS3502 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:3; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:22; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:22-9 RoHS Compliant: No |
| 中文描述： | 13位線性編解碼器特征與模擬前端模塊 |
| 文件頁數(shù)： | 6/29頁 |
| 文件大?。?/td> | 364K |
| 代理商： | AS3502 |
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REV. M
Page 6
September 1998
AS3502
shifted out of the encoder under control of an
externally applied shift clock signal SCLK.
In case of 8-bit companded mode the voice band
signals are converted to a PCM two's complement 7
data bit plus sign bit A-Law format with a sample rate
of 8 kHz and shifted out of the encoder under control
of an externally applied shift clock signal SCLK.
Receive Section
In case of 16 bit linear mode PCM data is shifted into
the input shift register at a clock rate determined by
the shift clock SCLK every 128 μs. 13 bits of PCM
data are transferred to the receive latch that holds the
data throughout the conversion process.
In case of 8-bit companded mode PCM data is shifted
into the input shift register at a clock rate determined
by the shift clock SCLK every 128μs and converted
from A-Law format to 13-bit linear format. Optionally a
programmable digital sidetone stage adds a certain
amount of the transmit signal to the receive path for
natural acoustic performance. The sidetone range can
be adjusted from -48 dB to 0 dB with a default value
of -18 dB. Both signals are combined and fed to a
digital gain setting stage which allows to program the
gain from -42 to +6 dB with a tolerance of ±0.05 dB
from 0 to -6dB to compensate for transducer
sensitivity
variations.
The
additionally be used for digital volume control for
receive volume attenuation. This feature may be used
for software based handsfree voice switching
algorithms. The gainsetting stage is followed by a
digital filter that bandlimits the signal according to
CCITT recommendations and that converts the
resolution in amplitude to resolution in time through
interpolation. The output signal is fed to a digital 2nd
order sigma delta modulator with a sampling rate of
1.024 MHz. The bit stream is further fed to a
combined 1 bit DAC / 2nd order SC Lowpass filter
with an corner frequency of 8 kHz and further to a 1st
order RC active smoothing filter that provides
additional filtering of out of band signals.
The loudspeaker volume may be controlled digitally
through the Receive Digital Gain Register DGR.
Tone Generator
AS3502 contains a powerful tone generator that is
capable of generating all European country specific
ring/ call progress tones and DTMF tones for audible
feedback in the receive path or inband signalling
tones in the transmit path under software control.
The
tone
generator
programmable through 13 8-bit registers that are
accessed through the serial control interface. (See
register description for further details). Since all
melody functions are handled by the AS3502 tone
generator hardware only a minimum amount of
same
stage
may
operation
modes
are
software overhead for the controlling microprocessor
is necessary.
The tone generator consists of a single /dual tone
synthesizer, a six tone sequencer, a cadence counter
and a repetition counter.
Frequency Generator
For in band signalling a square wave or sine signal
with precise DTMF capability is generated. The tones
may be added to the receive section or injected into
the transmit section. For tone ringing a square wave
push/pull signal is generated on the TRO+ and TRO-.
digital outputs.
Transmit Tone Volume Control
For sine wave forms the transmit PCM level is
controlled by a 0 /-2.5 dB attenuation block and
additionally by the digital transmit gain stage (DGX).
For square wave forms the transmit PCM level is
controlled by the V1 register and the DGX register.
Receive Tone Volume Control
The receive amplitude of sine wave signals may be
controlled via the V2 register.
The receive amplitude of square wave signals may be
controlled by both the V1 and the V2 register.
Tone Ringer Volume Control
The output volume is programmable through the V1
register and is accomplished either through pulse
density modulation or through pulse width modulation.
For pulse density volume control the amplitude is
controlled through the V1 register.
T/2
T/2
Start Melody
TRO+
TRO-
PW = 0
Pulse Density Volume Control
For pulse width volume control the R0 counter is used
where it generates the duty cycle. In this case the
repetition has to be controlled by the microprocessor
through software.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AS3502 EB | 制造商:AMS 功能描述:BOARD EVAL FOR AS3502 |
| AS3502-EB | 制造商:ams 功能描述:AS3501 Evaluation Board |
| AS3502-EQFP | 功能描述:IC HEADPHONE NOISE-CANCEL 32-QFN RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:* 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1,000 系列:- 濾波器類型:連續(xù)時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) |
| AS3502-EQFP-500 | 功能描述:IC HEADPHONE NOISE-CANCEL 32-QFN RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:* 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1,000 系列:- 濾波器類型:連續(xù)時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) |
| AS350-MSF | 制造商:Autec Power Systems 功能描述:AC/DC Power Supply Quad-OUT 3.3V/5V/12V/-12V 20A/20A/18A/0.8A 350W |
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