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參數(shù)資料
| 型號： | PCM1602APTR |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 27/46頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 24BIT 6CH 192KHZ 48-LQFP |
| 產(chǎn)品培訓模塊： | Data Converter Basics |
| 標準包裝： | 1,000 |
| 位數(shù)： | 24 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 6 |
| 電壓電源： | 模擬和數(shù)字 |
| 功率耗散（最大）： | 240mW |
| 工作溫度： | -25°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應商設備封裝： | 48-LQFP（7x7） |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 6 電壓，單極 |
| 采樣率（每秒）： | 192k |
| 配用： | DEM-DAI1602-ND - EVAL FIXTURE FOR PCM1602 |
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–
2
3
1
OPA2134
+
VOUT
R4
C2
C1
R3
R2
R1
VIN
A
V + *
R
2
R
1
S0053-02
www.ti.com
SLES146A – AUGUST 2005 – REVISED OCTOBER 2010
A typical application diagram is shown in Figure 31. The REG1117-3.3 from Texas Instruments is used to
generate 3.3 V for VDD from the 5-V analog power supply. The PLL170x from Texas Instruments is used to
generate the system clock input at SCKI, as well as generating the clock for the audio signal processor.
Series resistors (22-
to 100-) are recommended for SCKI, LRCK, BCK, DATA1, DATA2, and DATA3. The
series resistor combines with the stray PCB and device input capacitance to form a low-pass filter which removes
high-frequency noise from the digital signal, thus reducing high-frequency emission.
POWER SUPPLIES AND GROUNDING
The PCM1602A requires a 5-V analog supply and a 3.3-V digital supply. The 5-V supply is used to power the
DAC analog and output filter circuitry, whereas the 3.3-V supply is used to power the digital filter and serial
interface circuitry. For best performance, the 3.3-V supply should be derived from the 5-V supply using a linear
regulator (see Figure 31).
Two capacitors are required for supply bypassing (see Figure 30). These capacitors should be located as close
as possible to the PCM1602A package. The 10-mF capacitors should be tantalum or aluminum electrolytic,
whereas the 0.1-mF capacitors are ceramic (X7R type is recommended for surface-mount applications).
DAC OUTPUT FILTER CIRCUITS
Delta-sigma DACs use noise-shaping techniques to improve in-band signal-to-noise ratio (SNR) performance at
the expense of generating increased out-of-band noise above the Nyquist frequency, or fS/2. The out-of-band
noise must be low-pass filtered in order to provide optimal converter performance. This is accomplished by a
combination of on-chip and external low-pass filtering.
single-supply applications. These circuits are second-order Butterworth filters using the multiple feedback (MFB)
circuit arrangement, which reduces sensitivity to passive component variations over frequency and temperature.
For more information regarding MFB active filter design, see the FilterPro MFB and Sallen-Key Low-Pass Filter
Design Program application report (SBFA001), available from the TI Web site (www.ti.com).
Because the overall system performance is defined by the quality of the DACs and their associated analog
output circuitry, high-quality audio operational amplifiers are recommended for the active filters. The OPA2134
and OPA2353 dual operational amplifiers from Texas Instruments are shown in Figure 32 and Figure 33, and are
recommended for use with the PCM1602A.
Figure 32. Dual-Supply Filter Circuit
Copyright 2005–2010, Texas Instruments Incorporated
33
Product Folder Link(s): PCM1602A
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