AD7691BRMZ: 18位、1.5 LSB INL、250 kSPS PulSAR(R)差分ADC,采用MSOP或QFN封装
AD7691是一款18位、电荷再分配、逐次逼近型模数转换器（ADC）,采用2.3 V至5 V单电源（VDD）供电。该器件内置一个低功耗、高速、18位无失码采样ADC、一个内部转换时钟和一个多功能串行接口端口。在CNV上升沿,该器件对IN+与IN-引脚之间的电压差进行采样。这两个引脚上的电压摆幅通常在0 V至REF之间、相位相反。基准电压（REF）由外部提供。最高可设置为电源电压,其功耗和吞吐量呈线性变化关系。
SPI兼容串行接口还能够利用SDI输入,将几个ADC以菊花链形式连结到单三线式总线上,并提供一个可选的忙闲指示。采用独立电源VIO时,该器件与1.8V、2.5V、3V或5V逻辑兼容。AD7691采用10引脚MSOP封装或10引脚QFN（LFCSP）封装,工作温度范围为-40°C至+85°C。
The AD7691 is an 18-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V and 5 V. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between the IN+ and IN- pins. The voltages on these pins usually swing in opposite phase between 0 V and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.Its power scales linearly with throughput.
The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIO supply.The AD7691 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from -40°C to +85°C.
产品应用领域 Applications
- 电池供电设备
- 数据采集
- 地震数据采集系统
- 仪器仪表
- 医疗仪器
产品应用领域 Applications
- Battery-powered equipment
- Data acquisitions
- Seismic data acquisition systems
- Instrumentation
- Medical instruments
AD7691BRMZ 特点
- 18位分辨率、无失码
- 吞吐量： 250 kSPS
- 积分非线性（INL）：典型值±0.75 LSB,
最大值±1.5 LSB（FSR的±6 ppm） - 动态范围：102 dB（典型值、250 kSPS）
- 过采样动态范围：125 dB （1 kSPS）
- 无噪声编码分辨率：20 bits （1 kSPS）
- 有效分辨率：22.7 bits（1 kSPS）
- 信纳比（SINAD）：
101.5 dB（典型值、1 kHz） - 总谐波失真（THD）：
-125 dB（典型值、1 kHz） - 真差分模拟输入范围：
±VREF 0 V ～ VREF
（两个输入脚的VREF最高为VDD） - 无流水线延迟
- 单电源工作：2.3 V至5 V,含1.8 V/2.5 V/3 V/5 V逻辑接口
- 串行接口：
SPI-/QSPITM-/MICROWIRETM-/DSP-兼容 - 能够以菊花链形式联接多个ADC
- 可选的忙闲指示功能
- 功耗：
1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS
1.4 μW @ 2.5 V/100 SPS - 待机电流：1 nA
- 10引脚封装：MSOP（MSOP-8尺寸）和3 mm × 3 mm QFN （LFCSP）（SOT-23尺寸）
- 与18位AD7690和16位AD7693、AD7688、AD7687引脚兼容
- 18-bit resolution with no missing codes
- Throughput: 250 kSPS
- INL: ±0.75 LSB typical, ±1.5 LSB maximum (±6 ppm of FSR)
- Dynamic range: 102 dB typical @ 250 kSPS
- Oversampled dynamic range: 125 dB @1 kSPS
- Noise-free code resolution: 20 bits @ 1 kSPS
- Effective resolution: 22.7 bits @ 1 kSPS
- SINAD: 101.5 dB typical @ 1 kHz
- THD: -125 dB typical @ 1 kHz
- True differential analog input range: ±VREF 0 V to VREF with VREF up to VDD on both inputs
- No pipeline delay
- Single-supply 2.3 V to 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
- Serial interface SPI-/QSPITM-/MICROWIRETM-/DSP-compatible
- Ability to daisy-chain multiple ADCs
- Optional busy indicator feature
- Power dissipation
1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS
1.4 μW @ 2.5 V/100 SPS - Standby current: 1 nA
- 10-lead packages: MSOP (MSOP-8 size) and 3 mm × 3 mm QFN (LFCSP) (SOT-23 size)
- Pin-for-pin compatible with the18-bit AD7690 and 16-bit AD7693, AD7688, and AD7687
AD7691BRMZ 功能框图
AD7691 产品选型
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7691BCPZRL | Prodn | 10 ld LFCSP (3x3mm) | 10 | 工业 |
| AD7691BCPZRL7 | Prodn | 10 ld LFCSP (3x3mm) | 10 | 工业 |
| AD7691BRMZ | Prodn | 10 ld MSOP | 10 | 工业 |
| AD7691BRMZ-RL7 | Prodn | 10 ld MSOP | 10 | 工业 |
| EVAL-AD7691CBZ | Prodn | EVALUATION BOARDS | 8 | 工业 |
AD7691BRMZ 应用技术支持与电子电路设计开发资源下载
- AD7691 数据手册DataSheet下载. pdf
- Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .PDF
- ADC模数转换器选型指南 . PDF