AD7678:18位、100 kSPS PulSAR® ADC

AD7678是一款18位、100 kSPS、电荷再分配SAR型、全差分模数转换器（ADC）,采用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、一个内部基准电压缓冲、纠错电路,以及串行和并行系统接口。AD7678经过出厂硬件校准和全面测试,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）和总谐波失真（THD）等交流参数也合乎要求。该器件使用ADI公司的0.6微米高性能CMOS工艺制造,采用48引脚LQFP或48引脚LFCSP封装,工作温度范围为-40°C至+85°C。

The AD7678 is a 18-bit, 100 kSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates from a single 5 V power supply. The part contains a high-speed 18-bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports.

The AD7678 is hardware factory calibrated and is comprehensively tested to ensure such ac parameters as signal-to-noise ratio (SNR) and total harmonic distortion (THD), in addition to the more traditional dc parameters of gain, offset, and linearity.It is fabricated using Analog Devices’ high-performance, 0.6 micron CMOS process and is available in a 48-lead LQFP or a 48-lead LFCSP with operation specified from –40°C to +85°C.

AD7678 特点

18位分辨率、无失码
无流水线延迟（SAR架构）
差分输入范围：5 V
吞吐量：100 kSPS
积分非线性（INL）：最大值±2.5 LSB（满量程的±9.5 ppm）
动态范围：典型值102 dB
S/（N+D）：典型值100 dB（10 kHz时）
总谐波失真（THD）：典型值-115 dB （10 kHz时）
并行（18位、16位或8位总线）和串行5 V/3 V接口
片内基准电压缓冲
采用5 V单电源供电
功耗：
15 mW（100 kSPS时）
使用内部缓冲时典型值为20 mW
18 Bits Resolution with No Missing Codes
No Pipeline Delay (SAR architecture)
Differential Input Range: 5 V
Throughput: 100 kSPS
INL: ±2.5 LSB Max (±9.5 ppm of Full-Scale)
Dynamic Range : 102 dB Typ
S/(N+D): 100 dB Typ @ 10 kHz
THD: –115 dB Typ @ 10 kHz
Parallel (18, 16 or 8 bits bus) and Serial 5 V/3 V Interface
On-board Reference Buffer
Single 5 V Supply Operation
Power Dissipation:
- 15 mW @ 100 kSPS
- 20 mW Typ with internal buffer

AD7678 技术指标

Resolution (Bits): 18bit
# Chan: 1
Sample Rate: 100kSPS
Interface: Byte,Par,Ser,SPI
Analog Input Type: Diff-Uni
Ain Range: (2Vref) p-p,4 V p-p
ADC Architecture: SAR
Pkg Type: CSP,QFP

AD7678 功能框图

AD7678 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7678ACP	Prodn	48 ld LFCSP 7x7mm (5.25EP)	48	工业
AD7678ACPRL	Prodn	48 ld LFCSP 7x7mm (5.25EP)	48	工业
AD7678ACPZ	Prodn	48 ld LFCSP 7x7mm (5.25EP)	48	工业
AD7678ACPZRL	Prodn	48 ld LFCSP 7x7mm (5.25EP)	48	工业
AD7678AST	Prodn	48 ld LQFP	48	工业
AD7678ASTRL	Prodn	48 ld LQFP	48	工业
AD7678ASTZ	Prodn	48 ld LQFP	48	工业
AD7678ASTZRL	Prodn	48 ld LQFP	48	工业
EVAL-AD7678CB	Prodn	Evaluation Boards	-	工业
EVAL-AD7678CBZ	Prodn	EVALUATION BOARDS	-	工业