ADS92x4R 是一款引脚兼容型高速双通道同步采样模数转换器 (ADC),具有集成基准电压和基准电压缓冲器。该器件可由 5V 单电源供电运行,支持单极和全差分模拟输入信号,具有出色的直流和交流规格。该器件具有高达 1.5MHz 的模拟输入频率,交流性能出色,因此适合高带宽数据采集 (DAQ) 系统。
该器件支持 SPI 兼容串行(增强型 SPI)和字节宽并行接口,因此易于与多种微控制器、数字信号处理器 (DSP) 和现场可编程门阵列 (FPGA) 搭配使用。此器件还支持数据平均功能,该功能可提升高噪声环境中的交流性能。
该器件采用节省空间的 5mm × 5mm VQFN 封装。ADS92x4R 的额定扩展温度范围为 –40°C 至 +125°C。
器件型号 | 封装 | 封装尺寸(标称值) |
---|---|---|
ADS92x4R | VQFN (32) | 5.00mm x 5.00mm |
PIN | FUNCTION | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
AINM_A | 2 | Analog input | Negative analog input for channel A. |
AINM_B | 7 | Analog input | Negative analog input for channel B. |
AINP_A | 1 | Analog input | Positive analog input for channel A. |
AINP_B | 8 | Analog input | Positive analog input for channel B. |
AVDD | 12, 29 | Power supply | Analog power-supply pin.
Connect a 1-µF decoupling capacitor between pin 12 and pin 11. Connect a 1-µF decoupling capacitor between pin 29 and pin 30. |
CONVST | 13 | Digital input | Conversion start input pin.
A CONVST rising edge starts the conversion for ADC_A and ADC_B. |
CS | 14 | Digital input | Chip-select input pin; active low.
The host and device can communicate when CS is low. The SDO-x pins go to Hi-Z when CS is high. |
DVDD | 28 | Power supply | Interface power-supply pin.
Connect a 1-µF decoupling capacitor between pin 27 and pin 28. |
GND | 4, 11, 27, 30 | Power supply | Ground |
NC | 6 | — | No external connection |
PD/RST | 26 | Digital input | Asynchronous reset or power-down input pin.
See the Reset or Power-Down section. |
READY/STROBE | 25 | Digital output | Indicates data ready or strobe output for data capture. |
REFby2 | 3 | Analog output | REFby2 buffer output.
Connect a 1-µF decoupling capacitor between pin 3 and pin 4. |
REFOUT | 5 | Analog output | Internal reference output.
Connect a 1-µF decoupling capacitor between pin 5 and pin 4. |
REFM_A | 32 | Analog output | Negative output of reference buffer A. Negative reference input for ADC_A.
Externally connect to the device GND. |
REFM_B | 9 | Analog output | Negative output of reference buffer B. Negative reference input for ADC_B.
Externally connect to the device GND. |
REFP_A | 31 | Analog output | Positive output of reference buffer A. Positive reference input for ADC_A.
Connect a 10-µF decoupling capacitor between pin 31 and pin 32. |
REFP_B | 10 | Analog output | Positive output of reference buffer B. Positive reference input for ADC_B.
Connect a 10-µF decoupling capacitor between pin 9 and pin 10. |
SCLK | 16 | Digital input | Clock input pin for the serial interface. |
SDI | 15 | Digital input | Serial data input pin.
This pin is used to program the device registers. |
SDO-0/0A | 24 | Digital output | SPI mode: data output 0 for channel A.
Parallel byte mode: least significant bit (LSB) from the data byte. |
SDO-1/1A | 23 | Digital output | SPI mode: data output 1 for channel A.
Parallel byte mode: LSB+1 from the data byte. |
SDO-2/2A | 22 | Digital output | SPI mode: data output 2 for channel A.
Parallel byte mode: LSB+2 from the data byte. |
SDO-3/3A | 21 | Digital output | SPI mode: data output 3 for channel A.
Parallel byte mode: LSB+3 from the data byte. |
SDO-4/0B | 20 | Digital output | SPI mode: data output 0 for channel B.
Parallel byte mode: LSB+4 from the data byte. |
SDO-5/1B | 19 | Digital output | SPI mode: data output 1 for channel B.
Parallel byte mode: LSB+5 from the data byte. |
SDO-6/2B | 18 | Digital output | SPI mode: data output 2 for channel B.
Parallel byte mode: LSB+6 from the data byte. |
SDO-7/3B | 17 | Digital output | SPI mode: data output 3 for channel B.
Parallel byte mode: most significant bit (MSB) from the data byte. |
Thermal pad | Power supply | Exposed thermal pad. TI recommends connecting this pin to the printed circuit board (PCB) ground. |