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Product details

Parameters

Number of input channels 8 Active supply current (Typ) (mA) 133 Supply voltage (Max) (V) 3.6 Operating temperature range (C) 0 to 85 Interface type LVDS Features Analog Front End (AFE) open-in-new Find other Ultrasound AFEs

Package | Pins | Size

NFBGA (ZCF) 135 135 mm² 9 x 15 open-in-new Find other Ultrasound AFEs

Features

  • 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
  • Small Package: 15 mm × 9 mm, 135-BGA
open-in-new Find other Ultrasound AFEs

Description

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.
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Technical documentation

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Type Title Date
* Datasheet 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 datasheet (Rev. E) Aug. 25, 2014
Technical articles Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
User guides SONAR Receiver Path Sub-System Using the AFE5809 Design Guide Nov. 23, 2014
Technical articles JESD204B: Is it for you? Mar. 14, 2014
Technical articles A new way to illuminate the human condition Dec. 30, 2013
Technical articles Oximeter signaling: There’s more than meets the eye Dec. 04, 2013
Application notes Understanding Serial LVDS Capture in High-Speed ADCs Jul. 10, 2013
User guides AFE5809EVM User's Guide (Rev. A) Nov. 15, 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
Description

The AFE5809 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 integrates a complete time-gain-control (TGC) imaging path and a continuous wave Doppler (CWD) path. It also enables (...)

Features
  • 8-Channel Complete Analog Front-End
  • Programmable Gain Low-Noise Amplifier (LNA)
  • 40 dB Low Noise Voltage Controlled Attenuator
  • 24/30 dB Programmable Gain Amplifier
  • 14-bit Analog to Digital Converter
GUIS FOR EVALUATION MODULES (EVM) Download
SLOC276B.ZIP (179655 KB)

Design tools & simulation

SIMULATION MODELS Download
SLOM331.ZIP (46 KB) - PSpice Model
SIMULATION MODELS Download
SLOM332.ZIP (35 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLOM333.TSC (63 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLOM334.ZIP (74 KB) - PSpice Model
SIMULATION MODELS Download
SLOM335.TSC (106 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLOM336.ZIP (63 KB) - TINA-TI Spice Model

Reference designs

REFERENCE DESIGNS Download
SONAR Receiver Path Sub-System Reference Design Using an 8 Channel Analog Front End
TIDA-00419 The TIDA-00419 TI Design is a demonstration of a SONAR receive path sub-system using the integrated analog front end (AFE) AFE5809. The AFE5809 features 8 channels of analog signal conditioning  (LNA+VCAT+PGA) and Digital Processing (ADC+Digital Demodulator) that brings a high level of system (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
NFBGA (ZCF) 135 View options

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