VCA824 VC A8 24 VC A824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 Ultra-Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER FEATURES 1 DESCRIPTION • 710MHz SMALL-SIGNAL BANDWIDTH (G = +2V/V) • 320MHz, 4VPP BANDWIDTH (G = +10V/V) • 0.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com 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.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 ELECTRICAL CHARACTERISTICS: VS = ±5V At AVMAX = +10V/V, VG = +1V, RF = 402Ω, RG = 80Ω, and RL = 100Ω, unless otherwise noted.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com ELECTRICAL CHARACTERISTICS: VS = ±5V (continued) At AVMAX = +10V/V, VG = +1V, RF = 402Ω, RG = 80Ω, and RL = 100Ω, unless otherwise noted.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 TYPICAL CHARACTERISTICS: VS = ±5V, DC Parameters At TA = +25°C, RL = 100Ω, VG = +1V, and VIN = single-ended input on +VIN with –VIN at ground, unless otherwise noted. MAXIMUM DIFFERENTIAL INPUT VOLTAGE vs RG MAXIMUM GAIN ADJUST RANGE vs RF 40 IRG MAX = 2.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS: VS = ±5V, DC and Power-Supply Parameters At TA = +25°C, RL = 100Ω, VG = +1V, and VIN = single-ended input on +VIN with –VIN at ground, unless otherwise noted.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +2V/V At TA = +25°C, RL = 100Ω, RF = 453Ω, RG = 453Ω, VG = +1V, VIN = single-ended input on +VIN with –VIN at ground, and SO-14 package, unless otherwise noted. SMALL-SIGNAL FREQUENCY RESPONSE LARGE-SIGNAL FREQUENCY RESPONSE 3 3 VO = 0.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +2V/V (continued) At TA = +25°C, RL = 100Ω, RF = 453Ω, RG = 453Ω, VG = +1V, VIN = single-ended input on +VIN with –VIN at ground, and SO-14 package, unless otherwise noted.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +2V/V (continued) At TA = +25°C, RL = 100Ω, RF = 453Ω, RG = 453Ω, VG = +1V, VIN = single-ended input on +VIN with –VIN at ground, and SO-14 package, unless otherwise noted. GAIN vs GAIN CONTROL VOLTAGE GAIN CONTROL FREQUENCY RESPONSE 2.2 2.0 1.8 1.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +2V/V (continued) At TA = +25°C, RL = 100Ω, RF = 453Ω, RG = 453Ω, VG = +1V, VIN = single-ended input on +VIN with –VIN at ground, and SO-14 package, unless otherwise noted. RECOMMENDED RS vs CAPACITIVE LOAD FREQUENCY RESPONSE vs CAPACITIVE LOAD 9 100 VO = 0.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +10V/V At TA = +25°C, RL = 100Ω, RF = 402Ω, RG = 80Ω, VG = +1V, and VIN = single-ended input on +VIN with –VIN at ground, unless otherwise noted.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +10V/V (continued) At TA = +25°C, RL = 100Ω, RF = 402Ω, RG = 80Ω, VG = +1V, and VIN = single-ended input on +VIN with –VIN at ground, unless otherwise noted.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +10V/V (continued) At TA = +25°C, RL = 100Ω, RF = 402Ω, RG = 80Ω, VG = +1V, and VIN = single-ended input on +VIN with –VIN at ground, unless otherwise noted.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +10V/V (continued) At TA = +25°C, RL = 100Ω, RF = 402Ω, RG = 80Ω, VG = +1V, and VIN = single-ended input on +VIN with –VIN at ground, unless otherwise noted. OUTPUT LIMITED OVERDRIVE RECOVERY Output Voltage Right Scale 2 0 0 -0.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +40V/V At TA = +25°C, RL = 100Ω, RF = 402Ω, RG = 18Ω, VG = +1V, VIN = single-ended input on +VIN with –VIN at ground, and SO-14 package, unless otherwise noted.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +40V/V (continued) At TA = +25°C, RL = 100Ω, RF = 402Ω, RG = 18Ω, VG = +1V, VIN = single-ended input on +VIN with –VIN at ground, and SO-14 package, unless otherwise noted.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +40V/V (continued) At TA = +25°C, RL = 100Ω, RF = 402Ω, RG = 18Ω, VG = +1V, VIN = single-ended input on +VIN with –VIN at ground, and SO-14 package, unless otherwise noted.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS: VS = ±5V, AVMAX = +40V/V (continued) At TA = +25°C, RL = 100Ω, RF = 402Ω, RG = 18Ω, VG = +1V, VIN = single-ended input on +VIN with –VIN at ground, and SO-14 package, unless otherwise noted. GROUP DELAY vs GAIN CONTROL VOLTAGE GROUP DELAY vs FREQUENCY 2.5 2.15 10MHz 2.10 2.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 APPLICATION INFORMATION WIDEBAND VARIABLE GAIN AMPLIFIER OPERATION For test purposes, the input impedance is set to 50Ω with a resistor to ground and the output impedance is set to 50Ω with a series output resistor.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com FOUR-QUADRANT MULTIPLIER DIFFERENCE AMPLIFIER A four-quadrant multiplier can easily be implemented using the VCA824. By placing a resistor between FB and VIN, the transfer function depends upon both VIN and VG, as shown in Equation 1.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 DIFFERENTIAL EQUALIZER 9 Equalized Frequency Response 6 3 0 Gain (dB) If the application requires frequency shaping (the transition from one gain to another), the VCA824 can be used advantageously because its architecture allows the application to isolate the input from the gain setting elements.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com VIN R2 453W +VIN R8 50W RG+ R18 13.6kW R17 6kW R21 3kW R9 432W FB VREF VCA824 C7 300mF RG- GND R1 20W VG -VIN C6 320mF VOUT R10 75W VOUT 75W Load R5 50W C5 4pF VG = +1VDC C9 10mF Figure 83.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 DESIGN-IN TOOLS DEMONSTRATION BOARDS Two printed circuit boards (PCBs) are available to assist in the initial evaluation of circuit performance using the VCA824 in its two package options. Both of these are offered free of charge as unpopulated PCBs, delivered with a user's guide.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com PACKAGE CONSIDERATIONS The VCA824 is available in both SO-14 and MSOP-10 packages. Each package has, for the different gains used in the typical characteristics, different values of RF and RG in order to achieve the same performance detailed in the Electrical Characteristics table.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 MAXIMUM GAIN OF OPERATION This section describes the use of the VCA824 in a fixed-gain application in which the VG control pin is set at VG = +1V. The tradeoffs described here are with bandwidth, gain, and output voltage range.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com OUTPUT VOLTAGE DYNAMIC RANGE OFFSET ADJUSTMENT With its large output current capability and its wide output voltage swing of ±3.9V typical on 100Ω load, it is easy to forget other types of limitations that the VCA824 can encounter.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 NOISE This model is formulated in Equation 11 and Figure 89. The VCA824 offers 6nV/√Hz input-referred voltage noise density at a gain of +10V/V and 2.6pA/√Hz input-referred current noise density.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com THERMAL ANALYSIS The VCA824 does not require heatsinking or airflow in most applications. The maximum desired junction temperature sets the maximum allowed internal power dissipation as described in this section. In no case should the maximum junction temperature be allowed to exceed +150°C.
VCA824 www.ti.com....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008 INPUT AND ESD PROTECTION The VCA824 is built using a very high-speed complementary bipolar process. The internal junction breakdown voltages are relatively low for these very small geometry devices. These breakdowns are reflected in the Absolute Maximum Ratings table.
VCA824 SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008....................................................................................................................................... www.ti.com Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision B (August 2008) to Revision C ................................................................................................
PACKAGE OPTION ADDENDUM www.ti.
PACKAGE OPTION ADDENDUM www.ti.com (4) 18-Oct-2013 There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing VCA824IDGSR VSSOP DGS 10 VCA824IDGST VSSOP DGS VCA824IDR SOIC D SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 10 250 180.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.
PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) VCA824IDGSR VSSOP DGS 10 2500 367.0 367.0 35.0 VCA824IDGST VSSOP DGS 10 250 210.0 185.0 35.0 VCA824IDR SOIC D 14 2500 367.0 367.0 38.
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