VCA5807 Datasheet, PDF (1/64 Pages) Texas Instruments – Fully Integrated, 8-Channel Voltage Controlled Amplifier for Ultrasound with Passive CW Mixer, 0.75 nV/rtHz, 99 mW/CH

VCA5807
www.ti.com
SLOS727 – DECEMBER 2012
Fully Integrated, 8-Channel Voltage Controlled Amplifier for Ultrasound with Passive CW
Mixer, 0.75 nV/rtHz, 99 mW/CH
Check for Samples: VCA5807
FEATURES
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• 8-Channel Voltage Controlled Amplifier
– LNA, VCAT, PGA, LPF, and CW Mixer
• Programmable Low-Noise Amplifier (LNA)
– 24/18/12 dB Gain
– 0.25/0.5/1 V_PP 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)
• 3^rd Order Linear Phase Low-Pass Filter (LPF)
– 10, 15, 20, 30 MHz
– Butterworth Characteristics
• Noise/Power Optimizations (Full Chain)
– 99 mW/CH at 0.75 nV/rtHz
– 56 mW/CH at 1.1 nV/rtHz
– 80 mW/CH at CW Mode
• Excellent Device-to-Device Gain Matching
– ±0.5 dB (typical) and ±1.05 dB (max)
• Low Harmonic Distortion
• Fast and Consistent Overload Recovery
• Low Frequency Sonar Signal Processing
• 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 32X,16X, 8X, 4X and 1X CW Clocks
– 12dB Suppression on 3^rd and 5^th Harmonics
– Flexible Input Clocks
• 14mm x 14mm, 100-pin TQFP
APPLICATIONS
• Medical Ultrasound Imaging
• Nondestructive Evaluation Equipments
• Sonar Imaging
DESCRIPTION
The VCA5807 is an integrated Voltage Controlled
Amplifier (VCA) specifically designed for ultrasound
systems in which high performance and small size
are required. The VCA5807 integrates a complete
time-gain-control (TGC) imaging path and a
continuous wave Doppler (CWD) path. It also enables
users to select one of various power/noise
combinations to optimize system performance.
Therefore, the VCA5807 is a suitable ultrasound
analog front end solution not only for high-end
systems, but also for portable systems.
The VCA5807 contains eight channels of voltage
controlled amplifier (VCA), and CW mixer. The VCA
includes Low noise Amplifier(LNA), Voltage controlled
Attenuator (VCAT), Programmable Gain Amplifier
(PGA), and Low-Pass Filter (LPF). The LNA gain is
programmable to support 250 mV_PP to 1 V_PP input
signals. Programmable active termination is also
supported by the LNA. The ultra-low noise VCAT
provides an attenuation control range of 40dB and
improves overall low gain SNR which benefits
harmonic imaging and near field imaging. The PGA
provides gain options of 24 dB and 30 dB. Before the
ADC, a LPF can be configured as 10 MHz, 15 MHz,
20 MHz, or 30 MHz to support ultrasound
applications with different frequencies. In addition, the
signal chain of the VCA5807 can handle signal
frequency lower than 100 KHz, which enables it to be
used not only in ultrasound applications but also in
sonar applications.
The VCA5807 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 3^rd and 5^th order harmonic
suppression filter is implemented to enhance CW
sensitivity.
The VCA5807 is available in a 14mm x 14mm, 100-
pin TQFP package and it is specified for operation
from -40°C to 85°C.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated