AD7643: 18位、1.25 MSPS PulSAR® ADC

AD7643是一款18位、1.25 MSPS、电荷再分配SAR型、全差分模数转换器（ADC）,采用2.5 V单电源供电。该器件内置一个18位高速采样ADC、一个内部转换时钟、一个内部基准电压源（和缓冲）、纠错电路,以及串行和并行系统接口端口。该器件无延迟,可用于异步速率应用。AD7643经过出厂硬件校准和测试,可确保除一般直流参数（增益、偏置和线性度）之外,诸如信噪比（SNR）等交流参数也合乎要求。AD7643只提供无铅封装形式,工作温度范围为−40°C至+85°C。

The AD7643 is an 18-bit, 1.25 MSPS, charge redistribution SAR, fully differential, analog-to-digital converter (ADC) that operates from a single 2.5 V power supply. The part contains a high speed, 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. The part has no latency and can be used in asynchronous rate applications. The AD7643 is hardware factory calibrated and tested to ensure ac parameters, such as signal-to-noise ratio (SNR), in addition to the more traditional dc parameters of gain, offset, and linearity. The AD7643 is available in Pb-free only packages with operation specified from −40°C to +85°C.

AD7643 特点

• 吞吐量：1.25 MSPS
• 积分非线性（INL）：典型值±2 LSB，最大值±3 LSB；满量程±8 ppm
• 18位分辨率、无失码
• 动态范围：95.5 dB
• 信噪比：典型值93.5 dB @ 20 kHz（VREF = 2.5 V）
• 总谐波失真：典型值-112 dB @ 20 kHz （VREF = 2.5 V）
• 无流水线延迟（SAR架构）
• 2.048 V内部基准电压：典型漂移量为10 ppm/°C；TEMP输出
• 差分输入范围：±VREF （VREF 最高为2.5 V）
• 并行（18位、16位或8位总线）和串行5 V/3.3 V/2.5 V接口
• SPI®/QSPI™/MICROWIRE™/DSP 兼容
• 采用2.5 V单电源供电

AD7643 亮点

• Resolution (Bits): 18bit
• # Chan: 1
• Sample Rate: 1.25MSPS
• Interface: Byte,Par,Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• ADC Architecture: SAR
• Pkg Type: CSP,QFP

AD7643 亮点

1. 高吞吐量。AD7643是一款1.25 MSPS、电荷再分配、18位SAR ADC。
2. 出色的线性度。AD7643 18位无失码。
3. 内部基准电压源。AD7643具有一个2.048 V的内部基准电压源,典型漂移量为±10 ppm/°C,带有片内温度传感器。
4. 单电源供电。AD7643采用2.5 V单电源供电。
5. 串行或并行接口。多功能并行（18位、16位或8位总线）或双线串行接口配置,2.5 V、3.3 V或5 V逻辑兼容。

AD7643 应用领域

• 医疗仪器
• 高速数据采集/高动态数据采集
• 数字信号处理
• 频谱分析
• 仪器仪表
• 通信
• 自动测试设备

AD7643 建议配套产品

• Recommended Driver Amplifiers for the AD7643
  • For low noise, high gain bandwidth, we suggest the AD8021, ADA4899-1 or the dual AD8022, ADA4899-2.
  • For low bias current, low frequency, we recommend the AD8610.
  • For single-ended to differential driver applications, we recommend AD8139 or the ADA4930-1.
  • For a fully differential attenuating precision amplifier, we recommend the AD8475.
  • For low noise, low distortion, low power, we recommend the ADA4841-1.
• Recommended External Voltage References for the AD7643
  • For low noise, low temperature drift, we recommend the ADR421, ADR431 or the AD780.
  • For low power, we suggest the ADR291.
• For lowest cost, we suggest the AD1582.
• For external reference buffer, we recommend the AD8031 or the AD8032.
• Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.
  • For selecting supervisor products, use the Supervisor Parametric Search.

AD7643 功能框图

AD7643 产品选型

产品型号	产品状态	封装	Pins	报价* (1000 pcs.)
AD7643BCPZ	Prodn	48 ld LFCSP 7x7mm (5.25EP)	48	$ 29.95
AD7643BCPZRL	Prodn	48 ld LFCSP 7x7mm (5.25EP)	48	$ 29.95
AD7643BSTZ	Prodn	48 ld LQFP	48	$ 29.95
AD7643BSTZRL	Prodn	48 ld LQFP	48	$ 29.95
EVAL-AD7643CB	Prodn	EVALUATION BOARDS	-	$ 150.00
EVAL-AD7643CBZ	量产	EVALUATION BOARDS	-	$ 150.00

AD7643 应用技术支持与电子电路设计开发资源下载

1. AD7643 数据手册DataSheet下载 .PDF
2. Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .PDF
3. ADC模数转换器选型指南 .PDF