AFE5809
- 8-Channel Complete Analog Front-End
- LNA, VCAT, PGA, LPF, ADC, and CW Mixer
- Programmable Gain Low-Noise Amplifier (LNA)
- 24-, 18-, 12-dB Gain
- 0.25-, 0.5-, 1-VPP Linear Input Range
- 0.63-, 0.7-, 0.9-nV/rtHz Input Referred Noise
- Programmable Active Termination
- 40-dB Low-Noise Voltage Controlled Attenuator
(VCAT) - 24-/30-dB Programmable Gain Amplifier (PGA)
- Third-Order Linear Phase Low-Pass Filter (LPF)
- 10,15, 20, 30 MHz
- 14-Bit Analog-to-Digital Converter (ADC)
- 77 dBFS SNR at 65 MSPS
- LVDS Outputs
- Noise, Power Optimizations (Without Digital
Demodulator)- 158 mW/CH at 0.75 nV/rtHz, 65 MSPS
- 101 mW/CH at 1.1 nV/rtHz, 40 MSPS
- 80 mW/CH at CW Mode
- Excellent Device-to-Device Gain Matching
- ±0.5 dB (Typical) and ±1 dB (Maximum)
- Digital I/Q Demodulator after ADC
- Wide Range Demodulation Frequency
- <1 kHz Frequency Resolution
- Decimation Filter Factor M = 1 to 32
- 16xM Tap FIR Decimation Filter
- LVDS Rate Reduction after Demodulation
- On-Chip RAM With 32 Preset Profiles
- Low Harmonic Distortion
- Low-Frequency Sonar Signal Processing
- Fast and Consistent Overload Recovery
- Passive Mixer for Continuous Wave Doppler
(CWD)- Low Close-in Phase Noise –156 dBc/Hz at 1
kHz off 2.5-MHz Carrier - Phase Resolution of 1/16λ
- Support 16×, 8×, 4×, and 1× CW Clocks
- 12-dB Suppression on Third and Fifth
Harmonics - Flexible Input Clocks
- Low Close-in Phase Noise –156 dBc/Hz at 1
- Small Package: 15 mm × 9 mm, 135-BGA
The AFE5809 device is a highly-integrated analog front-end (AFE) solution specifically designed for ultrasound systems in which high performance and small size are required. The AFE5809 device integrates a complete time-gain-control (TGC) imaging path and a CWD path. The device also enables users to select one of various power and noise combinations to optimize system performance. Therefore, the AFE5809 device is a suitable ultrasound AFE solution not only for high-end systems, but also for portable ones.
The AFE5809 device contains eight channels of voltage controlled amplifier (VCA), 14, and 12-bit ADC, and CW mixer. The VCA includes LNA, VCAT, PGA, and LPF. The LNA gain is programmable to support 250 mVPP to 1 VPP input signals. Programmable active termination is also supported by the LNA. The ultra-low noise VCAT provides an attenuation control range of 40 dB and improves overall low-gain SNR, which benefits harmonic imaging and near-field imaging. The PGA provides gain options of 24 and 30 dB. Before the ADC, a LPF can be configured as 10, 15, 20, or 30 MHz to support ultrasound applications with different frequencies. In addition, the signal chain of the AFE5809 device can handle signal frequency lower than 100 kHz, which enables the device to be used in both sonar and medical applications. The high-performance 14-bit/65-MSPS ADC in the AFE5809 device achieves 77-dBFS SNR. It ensures excellent SNR at low chain gain. The ADC’s LVDS outputs enable flexible system integration desired for miniaturized systems.
The AFE5809 device integrates a low-power passive mixer and a low-noise summing amplifier to accomplish on-chip CWD beamformer. 16 selectable phase-delays can be applied to each analog input signal. Meanwhile, a unique third- and fifth-order harmonic suppression filter is implemented to enhance CW sensitivity.
The AFE5809 device also includes a digital in-phase and quadrature (I/Q) demodulator and a low-pass decimation filter. The main purpose of the demodulation block is to reduce the LVDS data rate and improve overall system power efficiency. The I/Q demodulator can accept ADC output with up to 65 MSPS sampling rate and 14-bit resolution. For example, after digital demodulation and 4× decimation filtering, the data rate for either in-phase or quadrature output is reduced to 16.25 MSPS and the data resolution is improved to 16 bits, consequently. Hence, the overall LVDS trace reduction can be a factor of 2. This demodulator can be bypassed and powered down completely if it is not needed.
The AFE5809 device is available in a 15-mm × 9-mm, 135-pin BGA package, and it is specified for operation from 0°C to 85°C.
Note: AFE5809 with date code later than 2014, that is date code >41XXXX, has below additional features which can be enabled by Register 61[15,14,13]. Existing analog performance remains the same.
- 61[13] enables an additional voltage clamp at the V2I input of the PGA. This limits the amount of overload signal the PGA sees.
- 61[14] enables a first-order 5-MHz LPF filter to suppress signals >5 MHz or high-order harmonics.
- 61[15] enables a –6-dB PGA clamp setting. The actual PGA output is less than the ADC’s full-scale amplitude, 2 Vpp.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | AFE5809 Fully Integrated, 8-Channel Ultrasound Analog Front End With Passive CW Mixer, and Digital I/Q Demodulator, 0.75 nV/rtHz, 14, 12-Bit, 65 MSPS, 158 mW/CH 数据表 (Rev. E) | PDF | HTML | 2014-8-25 | ||
| 设计指南 | SONAR Receiver Path Sub-System Using the AFE5809 Design Guide | 2014-11-23 | ||||
| 应用手册 | Understanding Serial LVDS Capture in High-Speed ADCs | 2013-7-10 |
设计与开发
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AFE5809EVM — AFE5809 评估模块
AFE5809 是一款高度集成的模拟前端 (AFE) 解决方案，专为需求高性能和小尺寸的超声波系统而设计。AFE5809 集成了完整的时间增益控制 (TGC) 成像路径和连续波多普勒 (CWD) 路径。借助该器件，用户还可以选择不同的功率/噪声组合来优化系统性能。因此，AFE5809 是一款不但适合于高端系统，而且也适用于便携式系统的超声波模拟前端解决方案。
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SLOC276 — AFE5809EVM GUI
TIDA-00419 — 采用 8 通道模拟前端的 SONAR 接收器路径子系统参考设计
该参考设计演示了使用集成模拟前端 (AFE) AFE5809 的声呐接收路径子系统。AFE5809 具有八个模拟信号调节 (LNA + VCAT + PGA) 和数字处理（ADC + 数字解调器）通道，可实现高水平的系统接收路径集成，并为高端 SONAR 系统实现高性能回声定位成像。该参考设计使用从 AFE5809EVM 修改的原理图演示了该声呐子系统。包含的测试数据是通过将 AFE5809EVM 与 TSW1400EVM FPGA 采集卡及其各自的软件 GUI 相结合而获取的，以模拟能够进行高性能测量的接收链解决方案。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| NFBGA (ZCF) | 135 | Ultra Librarian |
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