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參數(shù)資料
| 型號： | GA3222 |
| 廠商： | Gennum Corporation |
| 英文描述： | Advanta-TM ADRO-TM - Enabled DSP System |
| 中文描述： | 埃德瓦塔-商標化作-商標- DSP系統(tǒng)啟用 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 291K |
| 代理商： | GA3222 |
GA3222 Preliminary Data Sheet
34477 - 0
February 2006
12 of 21
7.5 A/D and D/A Converters
The system's two A/D converters are 2nd-order sigma-delta modulators, which
operate at a 2.048MHz sample rate. The system's two audio inputs are
pre-conditioned with antialias filtering and programmable gain pre-amplifiers.
These analog outputs are over sampled and modulated to produce two, 1-bit pulse
density modulated (PDM) data streams. The digital PDM data is then decimated
down to pulse-code modulated (PCM) digital words at the system sampling rate of
16kHz.
The D/A is comprised of a digital, 3rd-order sigma-delta modulator and an
H-bridge. The modulator accepts PCM audio data from the DSP path and converts
it into a 32-times over-sampled, 1-bit PDM data stream, which is then supplied to
the H-bridge. The H-bridge is a specialized CMOS output driver used to convert the
1-bit data stream into a differential output voltage waveform suitable for driving
low-impedance zero-biased hearing aid receivers.
7.6 HRX Head Room Expander
Advanta has an enhanced Head Room Expander (HRX) circuit, which increases
the input dynamic range of Advanta without any audible artifacts. This is
accomplished by dynamically adjusting the pre-amplifier’s gain and the post-A/D
attenuation depending on the input level.
7.7 Volume Control
An external 3-terminal volume control can be connected to Advanta. The volume
control range is adjustable from 0dB to +/-18dB, with support for non-symmetrical
configurations (e.g. from -5dB to +10dB).
7.8 Memory Select Switches
There are two, two-pole Memory Select switches available on Advanta, which
allows the user significant flexibility in switching between configurations. These
switches may be either momentary or static and are configurable to be either
pull-up or pull-down.
Up to four user memories can be configured on Advanta.
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