AD7656-1/AD7657-1/AD7658-1 分别是AD7656/AD7657/AD7658降低去耦要求的引脚和软件兼容版本,均内置6个16/14/12位、快速、低功耗逐次逼近型ADC,并集成到一个封装中,采用 iCMOS® 工艺(工业级CMOS)设计。 iCMOS是一种将高压硅与亚微米CMOS及互补双极性技术相结合的工艺。通过这种工艺,可开发在33V高压下工作的高性能模拟IC,其体积性能比是以往的高压器件所无法实现的。与采用传统CMOS工艺的模拟IC不同,i组件不但可以输入双极性信号,同时还能提升性能,大幅降低功耗并减小封装尺寸。三款器件的吞吐速率高达250 kSPS,并且内置低噪声、宽带宽采样保持放大器,可处理最高4.5 MHz的输入频率。
转换过程与数据采集利用CONVST信号和内部振荡器进行控制。三个CONVST引脚(CONVST A、CONVST B和CONVST C)允许三对ADC独立地进行同步采样。AD7656-1/AD7657-1/AD7658-1具有一个高速并行接口和一个高速串行接口,为器件与微处理器或DSP的接口连接创造了条件。选择串行接口模式时,每个器件都允许多个ADC以菊花链形式连接至单个串行接口。三款器件均可在 ±4 × VREF和±2 × VREFsub>范围内支持真双极性输入信号。此外还内置一个2.5 V片内基准电压源。
The AD7656-1/AD7657-1/AD7658-11 are reduced decoupling pin- and software-compatible versions of AD7656/AD7657/AD7658. The AD7656-1/AD7657-1/AD7658-1 devices contain six 16-/ 14-/12-bit, fast, low power successive approximation ADCs in a package designed on the iCMOS® process (industrial CMOS). iCMOS is a process combining high voltage silicon with submicron CMOS and complementary bipolar technologies. It enables the development of a wide range of high performance analog ICs capable of 33 V operation in a footprint that no previous generation of high voltage parts could achieve. Unlike analog ICs using conven-tional CMOS processes, iCMOS components can accept bipolar input signals while providing increased performance, which dramatically reduces power consumption and package size.
The AD7656-1/AD7657-1/AD7658-1 feature throughput rates of up to 250 kSPS. The parts contain low noise, wide bandwidth track-and-hold amplifiers that can handle input frequencies up to 4.5 MHz.
The conversion process and data acquisition are controlled using the CONVST signals and an internal oscillator. Three CONVST pins (CONVST A, CONVST B, and CONVST C) allow independent, simultaneous sampling of the three ADC pairs. The AD7656-1/AD7657-1/AD7658-1 have a high speed parallel and serial interface, allowing the devices to interface with microprocessors or DSPs. When the serial interface is selected, each part has a daisy-chain feature that allows multiple ADCs to connect to a single serial interface. The AD7656-1/AD7657-1/ AD7658-1 can accommodate true bipolar input signals in the ±4 × VREF and ±2 × VREF ranges. Each AD7656-1/AD7657-1/ AD7658-1 also contains an on-chip 2.5 V reference.1 Protected by U.S. Patent No. 6,731,232
产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
---|---|---|---|---|
AD7657BSTZ-1 | 量产 | 64 ld LQFP (10x10mm) | 64 | 工业 |
AD7657BSTZ-1-RL | 量产 | 64 ld LQFP (10x10mm) | 64 | 工业 |
AD7657YSTZ-1 | 量产 | 64 ld LQFP (10x10mm) | 64 | 工业 |
AD7657YSTZ-1-RL | 量产 | 64 ld LQFP (10x10mm) | 64 | 工业 |
EVAL-AD7657-1CBZ | 量产 | 评估板 | - | 待定 |
EVAL-AD7657-1EDZ | 量产 | 评估板 | - | 待定 |