参数资料
型号: Z8913820FSC
厂商: ZILOG INC
元件分类: 数字信号处理
英文描述: 8-BIT, 20.48 MHz, MIXED DSP, PQFP100
封装: QFP-100
文件页数: 48/65页
文件大小: 2054K
代理商: Z8913820FSC
Z89138/Z89139
Voice Processing Controllers
Zilog
52
P R E L I M I N A R Y
DS97TAD0201
A/D CONVERTER (ADC)
Analog to Digital Converter
The A/D converter is an 8-bit half flash converter which
uses two reference resistor ladders for its upper four bits
(MSBs) and lower four bits (LSBs) conversion (Figure 40).
Two reference voltage pins, VREF+ (High) and VREF-
(Low), are provided for external reference voltage sup-
plies.
During the sampling period, the converter is auto-zeroed
before starting the conversion time depending on the ex-
ternal clock frequency and the selection of the A/D sam-
pling rate (Figure 40). The sampling rates are 10 or 16 kHz
(XTAL = 20.48 MHz) in order to provide oversampling. The
rates are software controlled by the ACR (DSP External
Register 6). Timer2 supports the ADC. The maximum con-
version time is 2
s.
Figure 39. PWM Waveform of the Active Region
(for a 6-bit PWM data)
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