VCA2615RGZR ,2-Channel Variable Gain Amplifier 48-VQFN -40 to 85MAXIMUM RATINGSTexas Instruments recommends that allPower Supply (V ) . . . . . . . . . . . . . . . ..
VCA2615RGZT ,2-Channel Variable Gain Amplifier 48-VQFN -40 to 85Maximum Ratingsmay cause permanent damage. Exposure to absolute maximum parametric changes could ca ..
VCA2616YR ,Dual, Variable Gain Amlifier w/Low Noise Pre-AmpPIN CONFIGURATIONTop View TQFP48 47 46 45 44 43 42 41 40 39 38 371 36V A V BDD DD2 35NC NC3 34NC NC ..
VCA2616YT ,Dual, Variable Gain Amlifier w/Low Noise Pre-AmpMaximum Ratings” mayESD damage can range from subtle performance degrada-cause permanent damage to ..
VCA2617 ,2-Channel Variable Gain AmplifierMAXIMUM RATINGSTexas Instruments recommends that allPower Supply (V ) . . . . . . . . . . . . . . . ..
VCA2617RHBR ,2-Channel Variable Gain Amplifier 32-VQFN -40 to 85ELECTRICAL CHARACTERISTICS All specifications at T = +25°C, V = 5V, load resistance = 500Ω on each ..
W29C102Q-70 , 64K 16 CMOS FLASH MEMORY
W29C512AT-90 , 64 K x 8 CMOS FLASH MEMORY
W29EE011 , 128K X 8 CMOS FLASH MEMORY
W29EE011P-15 , 128K X 8 CMOS FLASH MEMORY
W29EE011P-15 , 128K X 8 CMOS FLASH MEMORY
W29EE011P-90 , 128K X 8 CMOS FLASH MEMORY
VCA2615-VCA2615PFBR-VCA2615RGZR-VCA2615RGZT
2-Channel Variable Gain Amplifier
FEATURES VERY LOW NOISE: 0.7nV/�Hz LOW-NOISE PREAMP (LNP)
− Active Termination
− Programmable Gains: 3, 12, 18, 22dB
− Programmable Input Impedance (RF)
− Buffered, Differential Outputs for CW
Processing
− Excellent Input Signal Handling
Capabilities LOW-NOISE VARIABLE-GAIN AMPLIFIER
− High/Low-Mode (0/+6dB)
− 52dB Gain Control Range
− Linear Control Response: 22dB/V
− Switchable Differential Inputs
− Adjustable Output Clipping-Level BANDWIDTH: 42MHz HARMONIC DISTORTION: −55dB 5V SINGLE SUPPLY LOW-POWER: 154mW/Channel POWER-DOWN MODES
APPLICATIONS MEDICAL AND INDUSTRIAL ULTRASOUND
SYSTEMS
− Suitable for 10-Bit and 12-Bit Systems TEST EQUIPMENT
DESCRIPTIONThe VCA2615 is a dual-channel, variable gain amplifier
consisting of a Low-Noise Preamplifier (LNP) and a Variable-
Gain Amplifier (VGA). This combination along with the device
features makes it well-suited for a variety of ultrasound
systems.
The LNP offers a high level of flexibility to adapt to a wide range
of systems and probes. The LNP gain can be programmed to
one of four settings (3dB, 12dB, 18dB, 22dB), while
maintaining excellent noise and signal handling
characteristics. The input impedance of the LNP can be
controlled by selecting one of the built-in feedback resistors.
This active termination allows the user to closely match the
LNP to a given source impedance, resulting in optimized
overall system noise performance. The differential LNP
outputs are provided either as buffered outputs for further CW
processing, or fed directly into the variable-gain amplifier
(VGA). Alternatively, an external signal can be applied to the
differential VGA inputs through a programmable switch.
Following a linear-in-dB response, the gain of the VGA can be
varied over a 52dB range with a 0.2V to 2.5V control voltage
common to both channels of the VCA2615. In addition, the
overall gain can be switched between a 0dB and +6dB
postgain, allowing the user to optimize the output swing of
VCA2615 for a variety of high-speed Analog-to-Digital
Converters (ADCs). As a means to improve system overload
recovery time, the VCA2615 provides an internal clipping
function where an externally applied voltage sets the desired
clipping level.
The VCA2615 operates on a single +5V supply and is
available in a small QFN-48 (7x7mm) or TQFP package.
LNPIN+
LNPOUT−FB1 FB2 FB3 FB4
LNPOUT+ VCAIN+ VCAIN− H/LG1 VCNTL VCLMPVCAINSEL
LNPIN−
VCAOUT+
VCAOUT−
VCA2615SBOS316D − JULY 2005 − REVISED OCTOBER 2008
Dual, Low-Noise
Variable-Gain Amplifier with Preamp
