VCA2617 BURR-BROWN | Alldatasheet

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Technical content

FEATURES

INDEPENDENT CHANNEL CONTROLS: − Gain Range: 48dB − Clamping Levels − Post-Gain: 0, +6dB LOW NOISE: 4.1nV/Hz LOW POWER: 52mW/Channel BANDWIDTH: 50MHz HARMONIC DISTORTION: −53dBc at 5MHz CROSSTALK: −61dB at 5MHz 5V SINGLE SUPPLY POWER-DOWN MODE SMALL QFN-32 PACKAGE (5x5mm)

APPLICATIONS

MEDICAL AND INDUSTRIAL ULTRASOUND SYSTEMS − Suitable for 10-Bit and 12-Bit Systems TEST EQUIPMENT SONAR

DESCRIPTION

The VCA2617 is a dual-channel, continuously variable, voltage-controlled gain amplifier well-suited for a variety of ultrasound systems as well as applications in proximity detectors and test equipment. The VCA2617 uses a true variable-gain amplifier architecture, achieving very good noise performance at low gains, while not sacrificing high gain distortion performance. Following a linear-in-dB response, the VCA2617 gain can be varied over a 48dB range with a 0.2V to 2.3V control voltage. Two separate high-impedance control inputs allow for a channel independent variation of the gains. Each channel of the VCA2617 can be configured to provide a gain range of −10dB to 38dB, or −16dB to 32dB, depending on the gain select pin (HG). This post-gain feature allows the user to optimize the output swing of VCA2617 for a variety of high-speed analog-to-digital converters (ADC). As a means to improve system overload recovery time, the VCA2617 also provides an internal clamping circuitry where an externally applied voltage sets the desired output clamping level. The VCA2617 operates on a single +5V supply while consuming only 52mW per channel. It is available in a small QFN-32 package (5x5mm).

RELATED PRODUCTS

Dual, Low-Noise, Variable-Gain Amplifier with Preamp V−I VCNTLB Gain Select B CEXTB VCLMPB Out B− Out A+ Out A− I−V In A− In A+ Clamping Circuitry In B− In B+ V−I VCNTLA VCLMPA Gain Select A CEXTA I−V Out B+ Clamping Circuitry VCA2617 SBOS326 −AUGUST 2005 Dual, Variable Gain Amplifier www.ti.com Copyright  2005, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners.

#$%& SBOS326 −AUGUST 2005 www.ti.com ABSOLUTE MAXIMUM RATINGS(1) Power Supply (VDD) +6V VCA2617 Analog Input −0.3V to (+VS + 0.3V) Logic Input −0.3V to (+VS + 0.3V) Case Temperature +100°C Junction Temperature +150°C Storage Temperature −40°C to +150°C (1) Stresses above those listed under Absolute Maximum Ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may affect device reliability. This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. PACKAGE/ORDERING INFORMATION(1) PRODUCT PACKAGE-LEAD PACKAGE DESIGNATOR SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER TRANSPORT MEDIA, QUANTITY VCA2617 QFN−32 RHB −40°C to +85°C VCA2617 VCA2617RHBT Tape and Reel, 250 VCA2617 QFN−32 RHB −40°C to +85°C VCA2617 VCA2617RHBR Tape and Reel, 3000 (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com.

#$%& SBOS326 −AUGUST 2005 www.ti.com

ELECTRICAL CHARACTERISTICS

All specifications at TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (1VPP), CA, CB = 3.9µF, single-ended input configuration, fIN = 5MHz, HG = Low (High-Gain Mode), VCNTL = 2.3V, unless otherwise noted. VCA2617 PARAMETER CONDITIONS MIN TYP MAX UNIT VARIABLE GAIN AMPLIFIER Input Resistance Single-Ended 300 kΩ Input Capacitance pF Maximum Input Voltage Linear Operation(1); Each Input Differential 2.0 VPP Single-Ended 1.0 VPP Input Voltage Noise Gain = 45dB, RS = 0Ω 4.1 nV/√Hz Input Current Noise Independent of Gain pA/√Hz Noise Figure 13.3 dB Input Common-Mode Voltage Internal 2.5 V Bandwidth MHz Clipping Voltage Range (VCLMP) 0.25 to 2.6 V Clipping Voltage Variation VCLMP = 0.5V, VCAOUT = 1.0VPP ±75 mV Maximum Capacitive Output Loading 50Ω in Series pF Slew Rate 100 V/µs Maximum Output Signal(1) VPP Output Common-Mode Voltage 2.5 V Output Impedance at 5MHz, Single-Ended, Either Output Ω Output Short-Circuit Current mA 2nd-Harmonic Distortion VOUT = 1VPP, VCNTL = 1.5V −43 −53 dBc 3rd-Harmonic Distortion VOUT = 1VPP, VCNTL = 1.5V −43 −62 dBc Overload Distortion (2nd-Harmonic) Input Signal = 1VPP, VCNTL = 2V −40 dBc Crosstalk −61 dB Delay Matching ns ACCURACY Gain Slope VCNTL = 0.4V to 2.0V dB/V Gain Error(2) VCNTL = 0.4V to 2.0V ±0.9 dB Gain Range VCNTL = 0.2V to 2.3V dB VCNTL = 0.4V to 2.0V 35.5 dB Gain Range (HG) HG = 0 (+6dB); VGA High Gain; VCNTL = 0.2V to 2.3V −10 to +38 dB HG = 1 (0dB); VGA Low Gain; VCNTL = 0.2V to 2.3V −16 to +32 dB Output Offset Voltage, Differential ±50 mV Channel-to-Channel Gain Matching VCNTL = 0.4V to 2.0V ±0.8 dB GAIN CONTROL INTERFACE (VCNTL) Input Voltage Range 0.2 to 2.3 V Input Resistance Response Time MΩ Input Resistance Response Time 42dB Gain Change; to 90% Signal Level 0.5 µs DIGITAL INPUTS(3), (4) (HGA, HGB, PD) VIH, High-Level Input Voltage 2.0 V VIL, Low-Level Input Voltage 0.8 V Input Resistance MΩ Input Capacitance pF POWER SUPPLY Supply Voltage 4.75 5.0 5.25 V Power Dissipation 105 125 mW Power-Down mW Power-Up Response Time µs Power-Down Response Time µs THERMAL CHARACTERISTICS Temperature Range Ambient, Operating −40 +85 Thermal Resistance, JA Soldered Pad; Four-Layer PCB with Thermal Vias 36.7 °C/W JC 4.0 °C/W (1) 2nd, 3rd-harmonic distortion less than or equal to −30dBc. (2) Referenced to best fit dB-linear curve. (3) Parameters ensured by design; not production tested. (4) Do not leave inputs floating; no internal pull-up/pull-down resistors.

#$%& SBOS326 −AUGUST 2005 www.ti.com PIN CONFIGURATION INA+ NC VDDR VB VCM GNDR NC INB+ VCNTLA VCLMPA HGA NC PD HGB VCLMPB VCNTLB VCA2617 (Thermal Pad tied to Ground Potential) INA− NC CA2 CA1 VDDA GNDA OutA− OutA+ INB− NC CB2 CB1 VDDB GNDB OutB− OutB+ PIN DESCRIPTIONS PIN DESIGNATOR Channel B Gain Control Voltage Input NC No Internal Connection VCLMPB Channel B Clamp Voltage VDDR Reference Supply HGB Channel B High/Low Output Gain (High = Low Gain) VB Bias Voltage, 0.1µF Bypass Capacitor PD Power Down (Active High) VCM Common-mode Voltage, 0.1µF Bypass Capacitor NC No Internal Connection GNDR Internal Reference Ground HGA Channel A High/Low Output Gain (High = Low Gain) NC No Internal Connection VCLMPA Channel A Clamp Voltage INB+ Channel B+ Input VCNTLA Channel A Gain Control Voltage Input INB− Channel B− Input OutA+ Channel A+ Output NC No Internal Connection OutA− Channel A− Output CB2 Channel B, External Coupling Capacitor GNDA Channel A Ground CB1 Channel B, External Coupling Capacitor VDDA Channel A Supply VDDB Channel B Supply CA1 Channel A; External Coupling Capacitor GNDB Channel B Ground CA2 Channel A; External Coupling Capacitor OutB− Channel B− Output NC No Internal Connection OutB+ Channel B+ Output INA− Channel A− Input

Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) VCA2617RHBR ACTIVE QFN RHB 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR VCA2617RHBRG4 ACTIVE QFN RHB 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR VCA2617RHBT ACTIVE QFN RHB 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR VCA2617RHBTG4 ACTIVE QFN RHB 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. PACKAGE OPTION ADDENDUM www.ti.com 27-Feb-2006 Addendum-Page 1

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