IC OPAMP VGA DIFF 80MHZ 48TQFP

VCA2611Y/250

Manufacturer Part NumberVCA2611Y/250
DescriptionIC OPAMP VGA DIFF 80MHZ 48TQFP
ManufacturerTexas Instruments
VCA2611Y/250 datasheet
 


Specifications of VCA2611Y/250

Amplifier TypeVariable GainNumber Of Circuits2
Output TypeDifferentialSlew Rate300 V/µs
Gain Bandwidth Product80MHz-3db Bandwidth40MHz
Current - Input Bias1nACurrent - Output / Channel40mA
Voltage - Supply, Single/dual (±)4.75 V ~ 5.25 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case48-TQFP, 48-VQFP
For Use WithVCA2611EVM - VCA2611EVMLead Free Status / RoHS StatusContains lead / RoHS non-compliant
Current - Supply-Voltage - Input Offset-
Other names296-15778-2  
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Dual, Variable-Gain Amplifier
with Low-Noise Preamp
FEATURES
LOW-NOISE PREAMP:
– Low Input Noise: 0.95nV/
Hz
– Active Termination Noise Reduction
– Switchable Termination Value
– 80MHz Bandwidth
– 5dB to 25dB Gain
– Differential In and Out
LOW-NOISE VARIABLE GAIN AMPLIFIER:
– Low-Noise VCA
– Up to 40dB Gain Range
– 40MHz Bandwidth
– Differential In and Out
LOW CROSSTALK: 66dB at Max Gain, 5MHz
HIGH-SPEED VARIABLE GAIN ADJUST
SWITCHABLE EXTERNAL PROCESSING
APPLICATIONS
ULTRASOUND SYSTEMS
WIRELESS RECEIVERS
TEST EQUIPMENT
FB
LNP
N VCA
N
CNTL
OUT
IN
RF
FBSW
2
VCA2616
RF
FB
1
(1 of 2 Channels)
Input
LNP
P
IN
LNP
Low Noise
GS1
LNP
LNP
Preamp
GS2
Gain
5dB to 25dB
Set
LNP
GS3
LNP
N
IN
LNP
P
VCA
P
OUT
IN
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
DESCRIPTION
The VCA2616 and VCA2611 are dual, Low-Noise Preamplifiers
(LNP), plus low-noise Variable Gain Amplifiers (VGA). The
VCA2611 is an upgraded version of the VCA2616. The only
difference between the VCA2616 and the VCA2611 is the input
structure to the LNP. The VCA2616 is limited to –0.3V negative-
going input spikes; the VCA2611 is limited to –2.0V negative-
going input spikes. This change allows the user to use slower
and less expensive input clamping diodes prior to the LNP input.
In some designs, input clamping may not be required.
The combination of Active Termination (AT) and Maximum
Gain Select (MGS) allow for the best noise performance. The
VCA2616 and VCA2611 also feature low crosstalk and out-
standing distortion performance.
The LNP has differential input and output capability and is
strappable for gains of 5dB, 17dB, 22dB, or 25dB. Low input
impedance is achieved by AT, resulting in as much as a 4.6dB
improvement in noise figure over conventional shunt termina-
tion. The termination value can also be switched to accommo-
date different sources. The output of the LNP is available for
external signal processing.
The variable gain is controlled by an analog voltage whose
gain varies from 0dB to the gain set by the MGS. The ability
to program the variable gain also allows the user to optimize
dynamic range. The VCA input can be switched from the LNP
to external circuits for different applications. The output can be
used in either a single-ended or differential mode to drive high-
performance Analog-to-Digital (A/D) converters, and is cleanly
limited for optimum overdrive recovery.
Maximum Gain Select
The combination of low noise, gain, and gain range program-
VCA
CNTL
mability makes the VCA2616 and VCA2611 versatile building
MGS
MGS
MGS
1
2
3
blocks in a number of applications where noise performance
is critical. The VCA2616 and VCA2611 are available in a
TQFP-48 package.
Analog
Maximum Gain
Control
Select
VCA
N
OUT
Programmable
Voltage
Gain Amplifier
Controlled
24 to 45dB
Attenuator
VCA
P
OUT
SEL
www.ti.com
VCA2616
VCA2611
SBOS234E – MARCH 2002 – REVISED NOVEMBER 2004
Copyright © 2002-2004, Texas Instruments Incorporated

VCA2611Y/250 Summary of contents

  • Page 1

    ... IN 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. PRODUCTION DATA information is current as of publication date. ...

  • Page 2

    ... ELECTROSTATIC DISCHARGE SENSITIVITY ORDERING TRANSPORT NUMBER MEDIA, QUANTITY VCA2616YT Tape and Reel, 250 " VCA2616YR Tape and Reel, 2000 VCA2611Y/250 Tape and Reel, 250 " VCA2611Y/2K Tape and Reel, 2000 = 5MHz, unless otherwise noted. IN VCA2616Y, VCA2611Y MIN TYP MAX 600 ...

  • Page 3

    PIN CONFIGURATION Top View VCA NA IN VCA LNP NA OUT LNP PA 7 OUT SWFBA 8 FBA 9 COMP1A 10 11 COMP2A LNP ...

  • Page 4

    TYPICAL CHARACTERISTICS + +5V, load resistance = 500 A DDA DDB DDR The input to the preamp (LNP) is single-ended, and the output from the VCA is single-ended, unless otherwise ...

  • Page 5

    TYPICAL CHARACTERISTICS + +5V, load resistance = 500 A DDA DDB DDR The input to the preamp (LNP) is single-ended, and the output from the VCA is single-ended, unless otherwise ...

  • Page 6

    TYPICAL CHARACTERISTICS + +5V, load resistance = 500 A DDA DDB DDR The input to the preamp (LNP) is single-ended, and the output from the VCA is single-ended unless otherwise ...

  • Page 7

    TYPICAL CHARACTERISTICS + +5V, load resistance = 500 A DDA DDB DDR The input to the preamp (LNP) is single-ended, and the output from the VCA is single-ended, unless otherwise ...

  • Page 8

    TYPICAL CHARACTERISTICS + +5V, load resistance = 500 A DDA DDB DDR The input to the preamp (LNP) is single-ended, and the output from the VCA is single-ended, unless otherwise ...

  • Page 9

    THEORY OF OPERATION The VCA2616 and VCA2611 are dual-channel systems con- sisting of three primary blocks: an LNP, a VCA, and a Programmable Gain Amplifier (PGA). For greater system flexibility, an onboard multiplexer is provided for the VCA inputs, selecting ...

  • Page 10

    PGA OVERVIEW AND OVERALL DEVICE CHARACTERISTICS The differential output of the VCA attenuator is then amplified by the PGA circuit block. This post-amplifier is programmed by the same MGS bits that control the VCA attenuator, yielding an overall swept-gain amplifier ...

  • Page 11

    R is the load resistor in the drains the resistor connected between the sources of the input S transistors Q and Q . The connections for various binations are brought out ...

  • Page 12

    R S LNP Conventional Cable Termination FIGURE 5. Configurations for Active Feedback and Conven- tional Cable Termination. the user-selected gain of the ...

  • Page 13

    Referring again to the input resistance calculation of Equa- tion (3), and considering that the gain term “A” falls off below 21kHz evident that the effective LNP input impedance will rise below 3.6kHz, with a DC limit of ...

  • Page 14

    The capacitance that is determined in Equation 5 should be added to the capacitance of Equation 4 to determine the overall bandwidth of the LNP. The LNP LNP NB (pin 25) should be bypassed to ground by the IN shortest ...

  • Page 15

    Attenuator Input Control Input 0dB –4.5dB 0dB –45dB 0.3V FIGURE 12. Piecewise Approximation ...

  • Page 16

    LNP Protection Network FIGURE 14. VCA2616 and VCA2611 Diode Bridge Protection Circuit. To prevent damage necessary to place a protection circuit between the transducer and the VCA2616 and VCA2611 (see Figure 14). Care must ...

  • Page 17

    ... PACKAGING INFORMATION (1) Orderable Device Status VCA2611Y/250 ACTIVE VCA2611Y/2K ACTIVE VCA2616YR ACTIVE VCA2616YT ACTIVE (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. ...

  • Page 18

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing VCA2611Y/250 TQFP PFB VCA2611Y/2K TQFP PFB VCA2616YR TQFP PFB VCA2616YT TQFP PFB PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 48 250 177.8 16.4 9 ...

  • Page 19

    ... Device Package Type VCA2611Y/250 TQFP VCA2611Y/2K TQFP VCA2616YR TQFP VCA2616YT TQFP PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm) PFB 48 250 PFB 48 2000 PFB 48 2000 PFB 48 250 Pack Materials-Page 2 20-Sep-2008 Width (mm) Height (mm) 190.5 212.7 31.8 346.0 346 ...

  • Page 20

    PFB (S-PQFP-G48) 0, 5,50 TYP 7,20 SQ 6,80 9,20 SQ 8,80 1,05 0,95 1,20 MAX NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Falls within JEDEC ...

  • Page 21

    ...

  • Page 22

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...