参数资料
型号: PCM1602APTG4
厂商: Texas Instruments
文件页数: 30/46页
文件大小: 0K
描述: IC DAC 24BIT 6CH 192KHZ 48-LQFP
产品培训模块: Data Converter Basics
标准包装: 250
位数: 24
数据接口: 串行
转换器数目: 6
电压电源: 模拟和数字
功率耗散(最大): 240mW
工作温度: -25°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 带卷 (TR)
输出数目和类型: 6 电压,单极
采样率(每秒): 192k
配用: DEM-DAI1602-ND - EVAL FIXTURE FOR PCM1602
B0008-03
+
Z–1
+
8-Level Quantizer
Z–1
IN
8 fS
OUT
64 fS
+
Z–1
+
Z–1
+
SLES146A – AUGUST 2005 – REVISED OCTOBER 2010
www.ti.com
THEORY OF OPERATION
The DAC section of the PCM1602A is based on a multi-bit delta-sigma architecture. This architecture uses a
fourth-order noise shaper and an 8-level amplitude quantizer, followed by an analog low-pass filter. A block
diagram of the delta-sigma modulator is shown in Figure 36. This architecture has the advantage of stability and
improved jitter tolerance, when compared to traditional 1-bit (2-level) delta-sigma designs.
Figure 36. Eight-Level Delta-Sigma Modulator
The combined oversampling rate of the digital interpolation filter and the delta-sigma modulator is 32 fS, 64 fS, or
128 fS. The total oversampling rate is determined by the desired sampling frequency. If fS ≤ 96 kHz, then the
OVER bit in register 12 can be set to an oversampling rate of 64 fS or 128 fS. If fS > 96 kHz, then the OVER bit
can be used to set the oversampling rate to 32 fS or 64 fS. Figure 37 shows the out-of-band quantization-noise
plots for both the 64× and 128× oversampling scenarios. Notice that the 128× oversampling plot shows
significantly improved out-of-band noise performance, allowing for a simplified low-pass filter to be used at the
output of the DAC.
36
Copyright 2005–2010, Texas Instruments Incorporated
Product Folder Link(s): PCM1602A
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