IC OPAMP VGA DIFF 80MHZ 48TQFP

VCA2613Y/250

Manufacturer Part NumberVCA2613Y/250
DescriptionIC OPAMP VGA DIFF 80MHZ 48TQFP
ManufacturerTexas Instruments
VCA2613Y/250 datasheet
 


Specifications of VCA2613Y/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 WithVCA2613EVM - VCA2613EVMVCA2611EVM - VCA2611EVMLead Free Status / RoHS StatusRequest inventory verification / Request inventory verification
Current - Supply-Voltage - Input Offset-
Other namesVCA2613YTR  
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
Page 1/19

Download datasheet (614Kb)Embed
Next
Dual, VARIABLE GAIN AMPLIFIER
with Low-Noise Preamp
FEATURES
LOW NOISE PREAMP:
Low Input Noise: 1.0nV/ 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: 3.3nV/ Hz, Differential
Programming Optimizes Noise Figure
24dB to 45dB Gain
40MHz Bandwidth
Differential In and Out
LOW CROSSTALK: 52dB at Max Gain, 5MHz
HIGH-SPEED VARIABLE GAIN ADJUST
SWITCHABLE EXTERNAL PROCESSING
APPLICATIONS
ULTRASOUND SYSTEMS
WIRELESS RECEIVERS
TEST EQUIPMENT
RF
FBSW
2
RF
FB
1
Input
LNP
P
IN
LNP
GS1
LNP
LNP
GS2
Gain Set
LNP
GS3
LNP
N
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 VCA2613 is a dual, Low-Noise Preamplifier (LNP), plus
low-noise Variable Gain Amplifier (VGA). The combination of
Active Termination (AT) and Maximum Gain Select (MGS)
allow for the best noise performance. The VCA2613 also
features low crosstalk and outstanding distortion perfor-
mance.
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.
The combination of low noise, gain, and gain range program-
mability makes the VCA2613 a versatile building block in a
number of applications where noise performance is critical.
The VCA2613 is available in a TQFP-48 package.
FB
LNP
N
VCA
N
VCA
CNTL
OUT
IN
CNTL
VCA2613
(1 of 2 Channels)
Analog
Control
Voltage
Low Noise
Preamp
Controlled
Attenuator
5dB to 25dB
LNP
P
VCA
P
SEL
OUT
IN
www.ti.com
VCA2613
SBOS179D – DECEMBER 2000 – REVISED OCTOBER 2004
Maximum Gain Select
MGS
MGS
MGS
0
1
2
Maximum Gain
Select
VCA
N
OUT
Programmable
Gain Amplifier
24 to 45dB
VCA
P
OUT
Copyright © 2000-2004, Texas Instruments Incorporated

VCA2613Y/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

    ... Full Gain Range CNTL = 0.2V CNTL = 3.0V 45dB Gain Change, MGS = 111 Operating, Both Channels www.ti.com ORDERING TRANSPORT NUMBER MEDIA, QUANTITY VCA2613Y/250 Tape and Reel, 250 VCA2613Y/2K Tape and Reel, 2000 = 5MHz, unless otherwise noted. IN VCA2613Y MIN TYP MAX ...

  • Page 3

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

  • Page 4

    TYPICAL PERFORMANCE CURVES + +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 ...

  • Page 5

    THEORY OF OPERATION The VCA2613 is a dual-channel system consisting of three primary blocks: a Low Noise Preamplifier (LNP), a Voltage Controlled Attenuator (VCA), and a Programmable Gain Amplifier (PGA). For greater system flexibility, an onboard multiplexer is provided for ...

  • Page 6

    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 7

    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 8

    R S LNP Conventional Cable Termination FIGURE 5. Configurations for Active Feedback and Conven- tional Cable Termination. of two (6dB) before being ...

  • Page 9

    Achieving the best active feedback architecture is difficult with conventional op amp circuit structures. The overall gain A must be negative in order to close the feedback loop, the input impedance must be high to maintain low current noise and ...

  • Page 10

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

  • Page 11

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

  • Page 12

    R S INPUT VCM FIGURE 13. Programmable Attenuator Section. comparator input threshold, the VCA output is blocked and an appropriate fixed DC level is substituted, providing fast and clean overload recovery. The basic ...

  • Page 13

    PGA POST-AMPLIFIER—DETAIL Figure 18 shows a simplified circuit diagram of the PGA block. As described previously, the PGA gain is programmed with the same MGS bits which control the VCA maximum attenuation factor. Specifically, the PGA gain at each MGS ...

  • Page 14

    ... PACKAGING INFORMATION Orderable Device (1) Package Type Package Status VCA2613Y/250 ACTIVE TQFP VCA2613Y/2K ACTIVE TQFP VCA2613Y/2KG4 ACTIVE TQFP (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 15

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing VCA2613Y/250 TQFP PFB VCA2613Y/2K TQFP PFB PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 48 250 177.8 16.4 9.6 48 2000 330.0 16.8 9.6 Pack Materials-Page 1 ...

  • Page 16

    ... Device Package Type VCA2613Y/250 TQFP VCA2613Y/2K TQFP PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm) PFB 48 250 PFB 48 2000 Pack Materials-Page 2 20-Sep-2008 Width (mm) Height (mm) 190.5 212.7 31.8 346.0 346.0 33.0 ...

  • Page 17

    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 18

    ...

  • Page 19

    ... 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’ ...