ADS7887SDCKT集成电路（IC）的模数转换器（ADC）规格书PDF中文资料

ADS7887SDCKT属于集成电路（IC）的模数转换器（ADC）。由德州仪器制造生产的ADS7887SDCKT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。

1 Features

1• 1.25-MHz Sample Rate Serial Device

• 10-Bit Resolution (ADS7887)

• 8-Bit Resolution (ADS7888)

• Zero Latency

• 25-MHz Serial Interface

• Supply Range: 2.35 V to 5.25 V

• Typical Power Dissipation at 1.25 MSPS:

– 3.8 mW at 3-V VDD

– 8 mw at 5-V VDD

• ±0.35 LSB INL, DNL (ADS7887)

• ±0.15 LSB INL, ±0.1 LSB DNL (ADS7888)

• 61 dB SINAD, –84 dB THD (ADS7887)

• 49.5 dB SINAD, –67.5 dB THD (ADS7888)

• Unipolar Input Range: 0 V to VDD

• Power-Down Current: 1 μA

• Wide Input Bandwidth: 15 MHz at 3 dB

• 6-Pin SOT23 and SC70 Packages

2 Applications

• Base Band Converters in Radio Communication

• Motor Current and Bus Voltage Sensors in Digital

Drives

• Optical Networking (DWDM, MEMS-Based

Switching)

• Optical Sensors

• Battery-Powered Systems

• Medical Instrumentations

• High-Speed Data Acquisition Systems

• High-Speed Closed-Loop Systems

3 Description

The ADS7887 device is a 10-bit, 1.25-MSPS, analogto-

digital converter (ADC), and the ADS7888 device

is a 8-bit, 1.25-MSPS ADC. These devices include a

capacitor-based SAR A/D converter with inherent

sample and hold. The serial interface in each device

is controlled by the CS and SCLK signals for glueless

connections with microprocessors and DSPs. The

input signal is sampled with the falling edge of CS,

and SCLK is used for conversion and serial data

output.

The devices operate from a wide supply range from

2.35 V to 5.25 V. The low power consumption of the

devices make them suitable for battery-powered

applications. The devices also include a powersaving,

power-down feature for when the devices are

operated at lower conversion speeds.

The high level of the digital input to the device is not

limited to device VDD. This means the digital input can

go as high as 5.25 V when device supply is 2.35 V.

This feature is useful when digital signals are coming

from other circuit with different supply levels. Also this

relaxes restriction on power-up sequencing.

The ADS7887 and ADS7888 are available in 6-pin

SOT-23 and SC70 packages and are specified for

operation from –40°C to 125°C.