AD7927BRU: 内置序列器的8通道、200 kSPS、12位ADC,采用20引脚TSSOP封装

The AD7927 is a 12-bit, high speed, low power, 8-channel, successive approximation ADC. The part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 200 kSPS. The part contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 8 MHz.

The conversion process and data acquisition are controlled using CS and the serial clock signal, allowing the device to easily interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. There are no pipeline delays associated with the part.

The AD7927 uses advanced design techniques to achieve very low power dissipation at maximum throughput rates. At maximum throughput rates, the AD7927 consumes 1.2 mA maximum with 3 V supplies; with 5 V supplies, the current consumption is 1.5 mA maximum.

Through the configuration of the control register, the analog input range for the part can be selected as 0 V to REFIN or 0 V to 2 × REFIN, with either straight binary or twos complement output coding. The AD7927 features eight single-ended analog inputs with a channel sequencer to allow a preprogrammed selection of channels to be converted sequentially.

The conversion time for the AD7927 is determined by the SCLK frequency, as this is also used as the master clock to control the conversion. The conversion time may be as short as 800 ns with a 20 MHz SCLK.

AD7927是一款12位、高速、低功耗、8通道、逐次逼近型ADC,采用2.7 V至5.25 V单电源供电,最高吞吐量达200 kSPS。该器件内置一个低噪声、宽带宽采样保持放大器,可处理8 MHz以上的输入频率。

转换过程和数据采集过程通过CS和串行时钟信号进行控制,从而为器件与微处理器或DSP轻松接口创造了条件。输入信号在CS的下降沿进行采样,而转换同时在此处启动。该器件无流水线延迟。

AD7927采用先进的设计技术,可在最高吞吐量下实现极低的功耗。在最高吞吐量下,采用3 V电源时,AD7927的最大功耗为1.2 mA；采用5 V电源时,最大功耗为1.5 mA。

通过配置控制寄存器,器件的模拟输入范围可以在0 V至REFIN或0 V至2 × REFIN间选择,可采用标准二进制或二进制补码输出编码。AD7927具有8个带通道序列器的单端模拟输入,可以通过预先编程选择通道转换顺序。

AD7927的转换时间取决于SCLK频率,该频率同时用作转换控制的主时钟。SCLK频率为20 MHz 时,转换时间可缩短至800 ns。

产品焦点 Product Highlights

1. High Throughput with Low Power Consumption. The AD7927 offers up to 200 kSPS throughput rates. At the maximum throughput rate with 3 V supplies, the AD7927 dissipates 3.6 mW of power maximum.
2. Eight Single-Ended Inputs with a Channel Sequencer. A consecutive sequence of channels can be selected on which the ADC cycles and converts.
3. Single-Supply Operation with VDRIVE Function. The AD7927 operates from a single 2.7 V to 5.25 V supply. The VDRIVE function allows the serial interface to connect directly to either 3 V or 5 V processor systems independent of AVDD.
4. Flexible Power/Serial Clock Speed Management. The conversion rate is determined by the serial clock, allowing the conversion time to be reduced through the serial clock speed increase. The part also features various shutdown modes to maximize power efficiency at lower throughput rates. Current consumption is 0.5 μA maximum when in full shutdown.
5. No Pipeline Delay. The part features a standard successive approximation ADC with a CS input pin, which allows for accurate control of each sampling instant.
6. 高吞吐量、低功耗。AD7927的吞吐量高达200 kSPS。在最高吞吐量下,采用3 V电源时,AD7927的最大功耗为3.6 mW。
7. 8个带通道序列器的单端输入。可以选择通道顺序,ADC将按该顺序循环执行转换。
8. 利用VDRIVE功能实现单电源供电。AD7927采用2.7 V至5.25 V单电源供电,利用VDRIVE功能,串行接口可直接连至独立于AVDD的3 V或5 V处理器系统。
9. 灵活的功耗/串行时钟速度管理。转换速率取决于串行时钟,通过提高串行时钟速度可缩短转换时间。该器件还提供多种关断模式,可在较低吞吐量下实现最高功效,完全关断时的最大功耗为0.5 uA。
10. 无流水线延迟。该器件采用标准逐次逼近型ADC,通过CS输入引脚可实现对每次采样时间的精确控制。

AD7927BRU 特性

• Fast throughput rate: 200 kSPS
• Specified for AVDD of 2.7 V to 5.25 V
• Low power
  3.6 mW maximum at 200 kSPS with 3 V supply
  7.5 mW maximum at 200 kSPS with 5 V supply
• Wide input bandwidth
  70 dB minimum SINAD at 50 kHz input frequency
• 8 (single-ended) inputs with sequencer
• Flexible power/serial clock speed management
• No pipeline delays
• High speed serial interface SPITM-, QSPITM-, MICROWIRETM-, DSP-compatible
• Shutdown mode: 0.5 μA maximum
• 20-lead TSSOP
• 高吞吐量：200 kSPS
• 额定电压（AVDD）：2.7 V至5.25 V
• 低功耗：
  最大3.6 mW（200 kSPS、3 V电源）
  最大7.5 mW（200 kSPS、5 V电源）
• 8个带序列器的（单端）输入
• 宽输入带宽
  信纳比：70 dB（最小值,50 kHz输入频率）
• 灵活的功耗/串行时钟速度管理
• 无流水线延迟
• 高速串行接口：
  SPI(R)/QSPITM/MICROWIRETM/DSP兼容
• 关断模式：最大0.5 uA
• 20引脚TSSOP

AD7927 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD7927BRU	量产	20 ld TSSOP	20	工业
AD7927BRU-REEL	量产	20 ld TSSOP	20	工业
AD7927BRU-REEL7	量产	20 ld TSSOP	20	工业
AD7927BRUZ	量产	20 ld TSSOP	20	工业
AD7927BRUZ-REEL	量产	20 ld TSSOP	20	工业
AD7927BRUZ-REEL7	量产	20 ld TSSOP	20	工业
EVAL-AD7927CBZ	量产	评估板	-	待定

AD7927BRU 应用技术支持与电子电路设计开发资源下载

1. AD7927 数据手册DataSheet下载. pdf
2. Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .PDF
3. ADC模数转换器选型指南 . PDF