AD1938: 四通道ADC/八通道DAC,内置PLL,192 kHz,24位编解码器

The AD193X family are high performance, single-chip CODECs that provide 4 ADCs with differential input and 8 DACs with either single-ended or differential output using ADI’s patented multibit sigma-delta architecture. An SPI(R) or I^2C(R) port is included, allowing a microcontroller to adjust volume and many other parameters. The AD193X family operates from 3.3 V digital and analog supplies. The AD193X is available in a 48-lead or 64-lead LQFP package.

The AD193X is designed for low EMI. This consideration is apparent in both the system and circuit design architectures. By using the on-board PLL to derive master clock from L/R clock, the AD193X eliminates the need for a separate high frequency master clock. It can also be used with a suppressed bit clock. The D/A and A/D converters are designed using the latest ADI continuous time architectures to further minimize EMI. By using 3.3 V supplies, power consumption is minimized, further reducing emissions.

AD1938是一款高性能的单芯片编解码器,它采用ADI公司专利的多比特Σ-Δ架构,可提供4个带输入的模数转换器（ADC）以及8个带单端输出的数模转换器（DAC）。内置的SPI端口使微控制器可以调整音量和许多其它参数。

AD1938采用3.3 V 数字与模拟电源供电,48引脚（单端输出）LQFP封装。这个产品系列的其它成员包括差分DAC输出以及I^2C (R)控制端口版本。

AD1938在系统和电路架构上都针对低电磁干扰（EMI）而设计。AD1938利用内置PLL驱动LR时钟或外部晶振的主时钟,从而无需单独的高频主时钟,而且可与抑制位时钟配合使用。DAC和ADC采用ADI公司最新的连续时间架构进行设计,进一步减小了电磁干扰。AD1938采用3.3 V电源供电,实现了最低功耗,进一步降低了电磁辐射。

产品应用领域 Applications

Automotive audio systems
Home theater systems
Set-top boxes
Digital audio effects processors
汽车音频系统
家庭影院系统
机顶盒
数字音频效果处理器

AD1938 特点

PLL generated (32-192 kHz) or direct master clock
Low EMI design
106 dB DAC/ 107 dB ADC Dynamic Range and SNR
-92 dB THD+N
Single 3.3 V Supply
Supports 24-bits and 8 kHz - 192 kHz sample rates
Tolerance for 5 V logic inputs
Stereo and TDM Modes up to 16 channel in/out
Differential ADC input
Single-ended DAC output for simple implementation
Log volume control with "auto-ramp" function and mute
I^2C Control Interface
PLL生成或直接主时钟
低EMI设计
DAC动态范围与SNR：108 dB；ADC动态范围与SNR：107 dB
THD + N：-94 dB
3.3 V单电源供电
5 V逻辑输入容限
支持24位音频以及8 kHz至192 kHz采样速率
欲了解更多特性,请参考数据手册

AD1938 功能框图

AD1938 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD1938YSTZ	量产	48 ld LQFP	48	工业
AD1938YSTZRL	量产	48 ld LQFP	48	工业