ADS7890IPFBT集成电路（IC）的模数转换器（ADC）规格书PDF中文资料

ADS7890IPFBT属于集成电路（IC）的模数转换器（ADC）。由美国德州仪器公司制造生产的ADS7890IPFBT模数转换器（ADC）模数转换器（ADC、A/D 或 A 转 D）对模拟信号进行采样，例如由麦克风采集的声音或传感器的输出，然后将其转换为数字信号。一般来说，数字输出是二进制补码二进制数，与输入成比例。输入类型可能是差分、伪差分或单端输入。模数转换器可按照位数、采样率、输入数、接口、转换器数和架构（例如自适应增量、双斜率、折叠、流水线、SAR、三角积分、两步式）进行选择。

FEATURES

1.25 MHz Sample Rate, 14-Bit Resolution

Zero Latency

Unipolar, Pseudo Differential Input, Range:

− 0 V to 2.5 V

SPI
Compatible Serial Interface

77.5 dB SNR and −95 dB THD at 0.5 MHz I/P

Power Dissipation 45 mW at 1.25 MSPS

Nap Mode (10 mW Power Dissipation)

Power Down (10
W)

Internal Reference

Internal Reference Buffer

48-Pin TQFP Package

APPLICATIONS

Optical Networking (DWDM, MEMS Based

Switching)

Spectrum Analyzers

High Speed Data Acquisition Systems

High Speed Close-Loop Systems

Telecommunication

DESCRIPTION

The ADS7890 is a 14-bit 1.25-MSPS A-to-D converter with 2.5-V internal reference. The device includes a

capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit serial SPI or DSP

compatible interface. The device has a pseudo-differential input stage.

The −IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor

and also to cancel common-mode noise. The device operates at lower power when used at lower conversion

rates because of the nap feature. The device is available in a 48-pin TQFP package.