AD7724:双核、七阶、Σ-Δ调制器

AD7724: 双核、七阶、Σ-Δ调制器

AD7724是一款双核、七阶、Σ-调制器,为AD7720的双核版本,90 kHz输入带宽时,其信噪比（SNR）可达90 dB。该器件采用5 V电源供电,接受以共模偏置电压为中心的0 V至2.5 V或±1.25 V差分输入电压。模拟输入由模拟调制器连续采样,因而无需外部采样保持电路。输入信息作为Ones密度包含在输出流中,通过适当的数字滤波器可重构原始信息。该器件提供精确的2.5 V片内基准电压,还具有基准电压输入/输出功能,可以将内部基准电压或外部系统基准电压用作器件的基准电压源。该器件采用48引脚TQFP封装,工作温度范围为–40°C至+85°C。通常,AD7724的输出会接一个数字滤波器,如同我们的标准Σ-模数转换一样,以实现并行模数转换效果。采用单独的滤波器则便于用户定制滤波器响应,这可通过我们的DSP或通过门阵列完成。

The AD7724 is a dual 7th-order, sigma-delta modulator - it's dual version of the AD7720. Its SNR performance is 90 dB over a 90 kHz bandwidth. The part operates from a 5 V supply and accepts a differential input range of 0 V to 2.5 V or ±1.25 V centered about a common-mode bias. The analog inputs are continuously sampled by the analog modulators, eliminating the need for external sample and hold circuitry. The input information is contained in the output stream as a density of ones. The original information can be reconstructed with an appropriate digital filter.The part provides an accurate on-chip 2.5 V reference. A reference input/output function is provided to allow either the internal reference or an external system reference to be used as the reference source for the part.The part is offered in a 48-pin TQFP package and is designed to operate from –40°C to 85°C.Typically, the AD7724 is followed by a digital filter to achieve a parallel A/D result, which is just like our standard sigma-delta A/Ds. Having a separate filter allows users to customize their filter respose, which can be done with one of our own DSPs or with a gate array.

AD7724 特点

主时钟频率：13 MHz
输入范围：0 V至+2.5 V或±1.25 V
单比特输出流
动态范围：90 dB
与3 V/5 V逻辑输出兼容
电源：
- AVDD, DVDD：5 V ± 5%
- DVDD1：3 V ± 5%
2.5 V片内基准电压
48引脚LQFP封装
13 MHz Master Clock Frequency
0 V to +2.5 V or ±1.25 V Input Range
Single Bit Output Stream
90 dB Dynamic Range
Logic Outputs 3 V/5 V Compatible
Power Supplies
- AVDD, DVDD: 5 V ± 5%
- DVDD1: 3 V ± 5%
On-Chip 2.5 V Voltage Reference
48-Lead LQFP

AD7724 技术指标

Resolution (Bits): 15bit
# Chan: 2
Sample Rate: 30MSPS
Interface: Ser
Analog Input Type: Diff-Bip,Diff-Uni
Ain Range: 2.5V p-p,Uni 2.5V
ADC Architecture: Sigma-Delta Modulator
Pkg Type: QFP

AD7724 功能框图

AD7724 芯片订购指南

产品型号	封装	引脚	温度范围	包装和数量	报价*(100-499)	报价*1000 pcs	RoHS
AD7724ASTZ 产品状态: 量产	48 ld LQFP	48	工业	Tray, 250	$ 11.90	$ 10.12	是
AD7724ASTZ-REEL 产品状态: 量产	48 ld LQFP	48	工业	Reel, 2000	-	$ 10.12	是