PDF VCA2612 Data sheet ( Hoja de datos )

Número de pieza	VCA2612
Descripción	TMDual/ VARIABLE GAIN AMPLIFIER with Low Noise Preamp
Fabricantes	Burr-Brown Corporation
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No Preview Available ! ® VCA2612 VCA2612 For most current data sheet and other product information, visit www.burr-brown.com TM Dual, VARIABLE GAIN AMPLIFIER with Low Noise Preamp FEATURES DESCRIPTION q LOW NOISE PREAMP: • Low Input Noise: 1.25nV/√Hz • Active Termination Noise Reduction • Switchable Termination Value • 80MHz Bandwidth • 5dB to 25dB Gain • Differential Input /Output q LOW NOISE VARIABLE GAIN AMPLIFIER: • Low Noise VCA: 3.3nV/√Hz, Differential Programming Optimizes Noise Figure • 24dB to 45dB Gain • 40MHz Bandwidth • Differential Input /Output q LOW CROSSTALK: 52dB at Max Gain, 5MHz q HIGH-SPEED VARIABLE GAIN ADJUST q SWITCHABLE EXTERNAL PROCESSING APPLICATIONS q ULTRASOUND SYSTEMS q WIRELESS RECEIVERS q TEST EQUIPMENT The VCA2612 is a highly integrated, dual receive chan- nel, signal processing subsystem. Each channel of the product consists of a low noise pre-amplifier (LNP) and a Variable Gain Amplifier (VGA). The LNP circuit provides the necessary connections to implement Active Termination (AT), a method of cable termination which results in up to 4.6dB noise figure improvement. Differ- ent cable termination characteristics can be accommo- dated by utilizing the VCA2612’s switchable LNA feed- back pins. The LNP has the ability to accept both differential and single ended inputs, and generates a differential output signal. The LNP provides strappable gains of 5dB, 17dB, 22dB and 25dB. The output of the LNP can be accessed externally for further signal processing, or fed directly into the VGA. The VCA2612’s VGA section consists of two parts, the Voltage Controlled Attenuator (VCA) and the Program- mable Gain Amplifier (PGA). The gain and gain range of the Programmable Gain Amplifier can be digitally programmed. The combination of these two program- mable elements results in a variable gain ranging from 0dB up to a maximum gain as defined by the user through external connections. The output of the VGA can be used in either a single-ended or differential mode to drive high performance analog-to-digital converters. The VCA2612 also features low crosstalk and outstand- ing distortion performance. The combination of low noise, and gain range programmability make the VCA2612 a versatile building block in a number of applications where noise performance is critical. The VCA2612 is available in a TQFP-48 package. FBCNTL LNPOUTN VCAINN RF2 FBSW RF1 FB VCA2612 (1 of 2 Channels) VCACNTL Analog Control Maximum Gain Select MGS1 MGS2 MGS3 Maximum Gain Select Input LNPINP LNPGS1 LNP LNPGS2 Gain Set LNPGS3 LNPINN Low Noise Preamp 5dB to 25dB Voltage Controlled Attenuator Programmable Gain Amplifier 24 to 45dB VCAOUTN VCAOUTP LNPOUTP VCAINP SEL International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 © 2000 Burr-Brown Corporation PDS-11541B VPCrinAted2in6U1.S.2A. March, 2000 ® 1 page TYPICAL PERFORMANCE CURVES At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, MGS = 011, LNP = 22dB and fIN = 5MHz, unless otherwise noted. The input to the preamp (LNP) is single-ended, and the output from the VCA is single-ended unless otherwise noted. GAIN vs VCACNTL 65 MGS = 111 60 MGS = 110 55 MGS = 101 50 45 MGS = 100 40 35 MGS = 011 30 MGS = 010 25 MGS = 001 20 MGS = 000 15 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 VCACNTL (V) GAIN ERROR vs TEMPERATURE 2.0 1.5 1.0 –40°C +25°C 0.5 0 –0.5 –1.0 +85°C –1.5 –2.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 VCACNTL (V) GAIN ERROR vs VCACNTL 2.0 1.5 1.0 1MHz 0.5 10MHz 0 –0.5 5MHz –1.0 –1.5 –2.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 VCACNTL (V) GAIN ERROR vs VCACNTL 2.0 1.5 1.0 MGS = 000 MGS = 011 0.5 0 –0.5 –1.0 –1.5 MGS = 111 –2.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 VCACNTL (V) GAIN MATCH: CHA to CHB = 0.2V 100 90 80 70 60 50 40 30 20 10 0 –0.5 –0.4 –0.3 –0.2 –0.1 0.0 0.1 0.2 0.3 0.4 0.5 Delta Gain (dB) GAIN MATCH: CHA to CHB = 3.0V 100 90 80 70 60 50 40 30 20 10 0 –0.5 –0.4 –0.3 –0.2 –0.1 0.0 0.1 0.2 0.3 0.4 0.5 Delta Gain (dB) ® 5 VCA2612 5 Page TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, MGS = 011, LNP = 22dB and fIN = 5MHz, unless otherwise noted. The input to the preamp (LNP) is single-ended, and the output from the VCA is single-ended unless otherwise noted. ICC vs TEMPERATURE 80 79.5 79 78.5 78 77.5 77 76.5 76 –40 –25 –10 5 20 35 50 65 80 95 Temperature (°C) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 GROUP DELAY vs FREQUENCY VCACNTL = 3.0V VCACNTL = 0.2V 10 Frequency (MHz) 100 –45 –40 –35 –30 –25 –20 –15 –10 –5 0 5 10 1.E+01 1.E+02 PSRR vs FREQUENCY 1.E+03 1.E+04 1.E+05 Frequency (Hz) 1.E+06 1.E+07 ® 11 VCA2612 11 Page

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