AD8331ARQ-REEL Analog Devices Inc, AD8331ARQ-REEL Datasheet

IC VGA SINGLE W/PREAMP 20-SSOP

AD8331ARQ-REEL

Manufacturer Part Number
AD8331ARQ-REEL
Description
IC VGA SINGLE W/PREAMP 20-SSOP
Manufacturer
Analog Devices Inc
Series
X-AMP®r
Type
Variable Gain Amplifierr
Datasheet

Specifications of AD8331ARQ-REEL

Rohs Status
RoHS non-compliant
Design Resources
Interfacing the High Frequency AD8331 to AD9215 (CN0096)
Applications
Signal Processing
Mounting Type
Surface Mount
Package / Case
20-QSOP
For Use With
AD8331-EVALZ - BOARD EVAL FOR AD8331
FEATURES
Ultralow noise preamplifier (preamp)
3 dB bandwidth
Low power
Wide gain range with programmable postamp
Low output-referred noise: 48 nV/√Hz typical
Active input impedance matching
Optimized for 10-bit/12-bit ADCs
Selectable output clamping level
Single 5 V supply operation
AD8332 and AD8334 available in lead frame chip scale package
APPLICATIONS
Ultrasound and sonar time-gain controls
High performance automatic gain control (AGC) systems
I/Q signal processing
High speed, dual ADC drivers
GENERAL DESCRIPTION
The AD8331/AD8332/AD8334 are single-, dual-, and quad-
channel, ultralow noise linear-in-dB, variable gain amplifiers
(VGAs). Optimized for ultrasound systems, they are usable as a
low noise variable gain element at frequencies up to 120 MHz.
Included in each channel are an ultralow noise preamp (LNA),
an X-AMP® VGA with 48 dB of gain range, and a selectable gain
postamp with adjustable output limiting. The LNA gain is 19 dB
with a single-ended input and differential outputs. Using a single
resistor, the LNA input impedance can be adjusted to match a
signal source without compromising noise performance.
The 48 dB gain range of the VGA makes these devices suitable
for a variety of applications. Excellent bandwidth uniformity is
maintained across the entire range. The gain control interface
provides precise linear-in-dB scaling of 50 dB/V for control
voltages between 40 mV and 1 V. Factory trim ensures excellent
part-to-part and channel-to-channel gain matching.
Rev. G
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
Voltage noise = 0.74 nV/√Hz
Current noise = 2.5 pA/√Hz
AD8331: 120 MHz
AD8332, AD8334: 100 MHz
AD8331: 125 mW/channel
AD8332, AD8334: 145 mW/channel
−4.5 dB to +43.5 dB in LO gain mode
7.5 dB to 55.5 dB in HI gain mode
Preamplifier and Programmable R
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
LMD
Differential signal paths result in superb second- and third-
order distortion performance and low crosstalk.
The low output-referred noise of the VGA is advantageous in
driving high speed differential ADCs. The gain of the postamp
can be pin selected to 3.5 dB or 15.5 dB to optimize gain range
and output noise for 12-bit or 10-bit converter applications. The
output can be limited to a user-selected clamping level, preventing
input overload to a subsequent ADC. An external resistor adjusts
the clamping level.
The operating temperature range is −40°C to +85°C. The
AD8331 is available in a 20-lead QSOP package, the AD8332 is
available in 28-lead TSSOP and 32-lead LFCSP packages, and
the AD8334 is available in a 64-lead LFCSP package.
INH
LNA
–10
AD8331/AD8332/AD8334
60
50
40
30
20
10
0
100k
19dB
LON
Ultralow Noise VGAs with
AD8331/AD8332/AD8334
FUNCTIONAL BLOCK DIAGRAM
VCM
BIAS
LOP
Figure 2. Frequency Response vs. Gain
Figure 1. Signal Path Block Diagram
©2003–2010 Analog Devices, Inc. All rights reserved.
VIP
1M
INTERPOLATOR
+
VGA BIAS AND
VIN
ATTENUATOR
V
V
V
V
V
V
GAIN
GAIN
GAIN
GAIN
GAIN
GAIN
48dB
FREQUENCY (Hz)
= 0.8V
= 0.6V
= 0.4V
= 0.2V
= 1V
= 0V
10M
ENB
VCM
V
MID
INTERFACE
CONTROL
21dB
GAIN
GAIN
3.5dB OR 15.5dB
100M
www.analog.com
PA
CLAMP
HI GAIN
MODE
HILO
1G
VOH
VOL
RCLMP
IN

Related parts for AD8331ARQ-REEL

AD8331ARQ-REEL Summary of contents

Page 1

FEATURES Ultralow noise preamplifier (preamp) Voltage noise = 0.74 nV/√Hz Current noise = 2.5 pA/√ bandwidth AD8331: 120 MHz AD8332, AD8334: 100 MHz Low power AD8331: 125 mW/channel AD8332, AD8334: 145 mW/channel Wide gain range with programmable postamp ...

Page 2

AD8331/AD8332/AD8334 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 4 Absolute Maximum Ratings ............................................................ 7 ESD Caution .................................................................................. 7 Pin Configurations and Function Descriptions ...

Page 3

E to Rev. F Changed Throughout ..................................................... Changes to Figure 1 ........................................................................... 1 Changes to Table 1, LNA and VGA Characteristics, Output Offset Voltage, Conditions ............................................................... 4 Changes to Quiescent Current per Channel ...

Page 4

AD8331/AD8332/AD8334 SPECIFICATIONS T = 25° 500 Ω −4 +43.5 dB gain (HILO = LO), and differential output voltage, unless otherwise specified. Table 1. Parameter LNA ...

Page 5

Parameter Output Signal Range, Postamplifier Differential Output Offset Voltage AD8331 AD8332, AD8334 Output Short-Circuit Current Harmonic Distortion AD8331 HD2 HD3 HD2 HD3 AD8332, AD8334 HD2 HD3 HD2 HD3 Input 1 dB Compression Point Two-Tone Intermodulation Distortion (IMD3) AD8331 AD8332, AD8334 ...

Page 6

AD8331/AD8332/AD8334 Parameter ENABLE INTERFACE (PIN ENB, PIN ENBL, PIN ENBV) Logic Level to Enable Power Logic Level to Disable Power Input Resistance Power-Up Response Time HILO GAIN RANGE INTERFACE (PIN HILO) Logic Level to Select HI Gain Range Logic Level ...

Page 7

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Voltage Supply Voltage (VPSn, VPSV, VPSL, VPOS) Input Voltage (INHx) ENB, ENBL, ENBV, HILO Voltage GAIN Voltage Power Dissipation 1 RU Package (AD8332) CP-32 Package (AD8332 Package (AD8331) CP-64 Package (AD8334) Temperature ...

Page 8

AD8331/AD8332/AD8334 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Table 3. 20-Lead QSOP Pin Function Description (AD8331) Pin No. Mnemonic 1 LMD 2 INH 3 VPSL 4 LON 5 LOP 6 COML 7 VIP 8 VIN 9 MODE 10 GAIN 11 VCM 12 ...

Page 9

LMD2 1 28 PIN 1 INDICATOR INH2 2 27 VPS2 3 26 LON2 4 25 LOP2 5 24 AD8332 COM2 6 23 TOP VIEW VIP2 (Not to Scale VIN2 8 21 VCM2 9 20 GAIN 10 19 RCLMP ...

Page 10

AD8331/AD8332/AD8334 Table 6. 64-Lead LFCSP Pin Function Description (AD8334) Pin No. Mnemonic 1 INH2 2 LMD2 LON2 5 LOP2 6 VIP2 7 VIN2 8 VPS2 9 VPS3 10 VIN3 11 VIP3 12 LOP3 13 LON3 14 NC ...

Page 11

Pin No. Mnemonic 27 GAIN34 28 CLMP34 29 HILO 30 VCM4 31 VCM3 COM34 34 VOH4 35 VOL4 36 VPS34 37 VOL3 38 VOH3 39 COM34 MODE 42 COM12 43 VOH2 44 VOL2 45 ...

Page 12

AD8331/AD8332/AD8334 TYPICAL PERFORMANCE CHARACTERISTICS T = 25° 500 Ω −4 +43.5 dB gain (HILO = LO), and differential output voltage, unless otherwise specified ...

Page 13

GAIN 0.8V GAIN 0.6V GAIN 0.4V GAIN 0.2V GAIN GAIN 0 –10 100k 1M 10M FREQUENCY (Hz) Figure 13. Frequency ...

Page 14

AD8331/AD8332/AD8334 35 SAMPLE SIZE = 100 0.2V < V < 0.7V GAIN 49.6 49.7 49.8 49.9 50.0 50.1 GAIN SCALING FACTOR Figure 19. Gain Scaling Factor Histogram 100 SINGLE ENDED, PIN VOH OR ...

Page 15

AD8332 HI GAIN AD8334 LO GAIN AD8331 200 100 0 0 0.2 0.4 0.6 V (V) GAIN Figure 25. Output-Referred Noise vs. V 2.5 ∞ 1V, ...

Page 16

AD8331/AD8332/AD8334 35 PREAMP LIMITED HILO = LO 50Ω IN ∞ HILO = LO HILO = HI 50Ω IN ∞ HILO = HI ...

Page 17

p-p OUT –20 INPUT RANGE LIMITED WHEN –40 HILO = LO HILO = LO, HD3 HILO = LO, HD2 –60 –80 HILO = HI, HD3 –100 HILO = HI, HD2 –120 0 0.1 0.2 0.3 0.4 ...

Page 18

AD8331/AD8332/AD8334 20mV 100 500mV Figure 43. Large Signal Pulse Response dB, HILO = HI or LO, Top: Input, Bottom: Output Voltage 30dB 1 INPUT 0 –1 INPUT IS NOT TO SCALE ...

Page 19

Figure 49. VGA Overdrive Recovery p p-p Burst, INH VGA Output Shown Attenuated GAIN 1V 100 Figure 50. VGA ...

Page 20

AD8331/AD8332/AD8334 TEST CIRCUITS MEASUREMENT CONSIDERATIONS Figure 55 through Figure 68 show typical measurement configurations and proper interface values for measurements with 50 Ω conditions. Short-circuit input noise measurements are made as shown in Figure 62. The input-referred noise level is ...

Page 21

NETWORK ANALYZER 50Ω OUT 10kΩ 18nF 0.1µF OR FB* 120nH 1µF INH LNA 22pF 0.1µF *FERRITE BEAD Figure 58. Test Circuit—Group Delay vs. Frequency for Two Values of AC Coupling NETWORK ANALYZER FB* 0.1µF 120nH 50Ω OUT 22pF *FERRITE BEAD ...

Page 22

AD8331/AD8332/AD8334 49.9Ω 50Ω –6dB LPF 50Ω SIGNAL GENERATOR –6dB LPF 50Ω SIGNAL GENERATOR –6dB +22dB 50Ω –6dB +22dB 50Ω SIGNAL GENERATORS A GAIN 0.1µF FERRITE BEAD 0.1µF 120nH INH DUT 22pF 1Ω 0.1µF 0.1µF SIGNAL GENERATOR LMD TO MEASURE GAIN ...

Page 23

FB* 0.1µF 120nH INH DUT 22pF 237Ω 50Ω LMD 0.1µF 0.1µF *FERRITE BEAD Figure 66. Test Circuit—Pulse Response Measurements 18nF 270Ω 0.1µF FB* 0.1µF 255Ω 120nH INH DUT 22pF 50Ω RF LMD 0.1µF 255Ω SIGNAL 0.1µF ...

Page 24

AD8331/AD8332/AD8334 THEORY OF OPERATION OVERVIEW The AD8331/AD8332/AD8334 operate in the same way. Figure 69, Figure 70, and Figure 71 are functional block diagrams of the three devices LON LOP VIP VIN VCM V MID – + ATTENUATOR INH LNA –48dB ...

Page 25

The linear-in-dB, gain control interface is trimmed for slope and absolute accuracy. The gain range is +48 dB, extending from −4 +43 gain and +7 +55 gain mode. The slope ...

Page 26

AD8331/AD8332/AD8334 Active Impedance Matching The LNA supports active impedance matching through an external shunt feedback resistor from Pin LON to Pin INH. The input resistance given in Equation 5, where A is the single- IN ended gain ...

Page 27

The primary purpose of input impedance matching is to improve the system transient response. With resistive termination, the input noise increases due to the thermal noise of the matching resistor and the increased contribution of the LNA input voltage noise ...

Page 28

AD8331/AD8332/AD8334 VGA Noise In a typical application, a VGA compresses a wide dynamic range input signal to within the input span of an ADC. While the input-referred noise of the LNA limits the minimum resolvable input signal, the output-referred noise, ...

Page 29

Output Clamping Outputs are internally limited to a level of 4.5 V p-p differential when operating at a 2.5 V common-mode voltage. The postamp implements an optional output clamp engaged through a resistor from R to ground. Table 8 shows ...

Page 30

AD8331/AD8332/AD8334 APPLICATIONS INFORMATION LNA—EXTERNAL COMPONENTS The LMD pin (connected to the bias circuitry) must be bypassed to ground and signal sourced to the INH pin, which is capacitively coupled using 2 0.1 μF capacitors (see Figure 81). The ...

Page 31

Gain Input The GAIN pin is common to both channels of the AD8332. The input impedance is nominally 10 MΩ, and a bypass capacitor from 100 recommended. Parallel connected devices can be driven by a ...

Page 32

AD8331/AD8332/AD8334 with gains less than 40 dB. The exact values of these components can be selected empirically. An antialiasing noise filter is typically used with an ADC. Filter requirements are application dependent. When the ADC resides on a separate board, ...

Page 33

When selecting overload protection, the important parameters are forward and reverse voltages and t rr BAS40-04 series shown in Figure 88 has a τ of 310 mA. Many variations of these specifications can be found in vendor ...

Page 34

AD8331/AD8332/AD8334 ULTRASOUND TGC APPLICATION The AD8332 ideally meets the requirements of medical and industrial ultrasound applications. The TGC amplifier is a key subsystem in such applications because it provides the means for echo location of reflected ultrasound energy. Figure 91 ...

Page 35

S3 E IN2 TP3 (RED) +5V TB1 CFB2 +5V 18nF + C46 TP4 1µF (BLACK) RFB2 TB2 274Ω GND L7 120nH FB +5VGA L6 120nH FB +5VLNA C51 0.1µF VCM1 JP13 TP2 GAIN TP7 GND CLMP 0.1µF ...

Page 36

AD8331/AD8332/AD8334 VR1 ADP3339AKC-3.3 L5 C44 120nH FB 1µF +5V + C31 0.1µ OUT GND L4 120nH FB C30 OUT 0.1µF TAB L3 120nH FB C29 0.1µF L2 120nH FB C1 0.1µF +3.3VCLK R18 S2 C63 499Ω ...

Page 37

U10 DATACLKA G1 VCC 74VHC541 GND × OTR_A D11_A ...

Page 38

AD8331/AD8332/AD8334 COM3 COM4 INH4 LMD4 NC LON4 LOP4 VIP4 VIN4 VPS4 GAIN34 CLMP34 HILO VCM4 VCM3 NC 03199-094 Figure 94. Compact Signal Path and Board Layout for the Rev Page COM2 COM1 INH1 LMD1 NC ...

Page 39

AD8331 EVALUATION BOARD GENERAL DESCRIPTION The AD8331 evaluation board is a platform for testing and evaluating the AD8331 variable gain amplifier (VGA). The board is provided completely assembled and tested; the user simply connects an input signal, VGAIN sources, and ...

Page 40

... C3 1 LMD2 COMM 10µF CLMD 10V 0.1µF 2 INH ENB CSH CFB 22pF 0.018µF RFB L2 274µF 3 VPS ENBV C6 DUT 0.1µF AD8331ARQ C1 4 LON COMM LOP VOL 6 COML VOH C16 C14 0.1µF 0.1µF 7 VIP VPOS 8 VIN HILO +5V ...

Page 41

ANALYZER DP8200 PRECISION VOLTAGE REFERENCE (FOR VGAIN) Figure 97 1103 TEKPROBE POWER SUPPLY +5V GND DIFFERENTIAL PROBE TO VO PINS INSERT JUMPERS W5 AND W6 TO USE OUTPUT TRANSFORMER AND VOH SMA AD8331 Typical Board Test ...

Page 42

AD8331/AD8332/AD8334 AD8331 EVALUATION BOARD PCB LAYERS Figure 98. AD8331-EVALZ Assembly Figure 99. Primary Side Copper Figure 100. Secondary Side Copper Figure 101. Internal Layer Ground Figure 102. Power Plane Figure 103. Top Silkscreen Rev Page ...

Page 43

AD8332 EVALUATION BOARD GENERAL DESCRIPTION The AD8332-EVALZ is a platform for the testing and evaluation of the AD8332 variable gain amplifier (VGA). The board is shipped assembled and tested, and users need only connect the signal and VGAIN sources to ...

Page 44

AD8331/AD8332/AD8334 EVALUATION BOARD SCHEMATICS +5V GND GND1 GND2 + C25 10µ 0.1µF LNA2 120nH FB CAL2 L8 120nH FB +5V 0.1µF +5VLNA S6 LON2 C9 R10 R12 LOP2 0.1µF TP3 CLAMP RCLMP C11 T2 R13 ...

Page 45

VGAIN SUPPLY Figure 106. NETWORK ANALYZER AD8332 Typical Board Test Connections Rev Page AD8331/AD8332/AD8334 1103 TEKPROBE POWER SUPPLY DIFFERENTIAL PROBE ...

Page 46

AD8331/AD8332/AD8334 AD8332 EVALUATION BOARD PCB LAYERS Figure 107. AD8332-EVALZ Assembly Figure 108. Primary Side Copper Figure 109. Secondary Side Copper Figure 110. Ground Plane Figure 111. Power Plane Figure 112. Component Side Silkscreen Rev Page ...

Page 47

AD8334 EVALUATION BOARD GENERAL DESCRIPTION The AD8334-EVALZ is a platform for the testing and evaluation of the AD8334 variable gain amplifier (VGA). The board is shipped assembled and tested, and users need only connect the signal and VGAIN sources and ...

Page 48

AD8331/AD8332/AD8334 CONFIGURING THE INPUT IMPEDANCE The board is built and tested using the components shown in black in Figure 115. Provisions are made for optional components (shown in gray) that can be installed at user discretion. As shipped, the input ...

Page 49

EVALUATION BOARD SCHEMATICS + 5V G ND1 G ND2 G ND3 G ND4 G ND5 G ND6 + C14 10 µF ICR1 1 CR1 C7 CFB2 C8 L7 0.1 µF INH2 120 IN2 ICR2 RFB2 ...

Page 50

AD8331/AD8332/AD8334 PRECISION VOLTAGE REFERENCE (FOR VGAIN) NETWORK ANALYZER SIGNAL INPUT Figure 116. GAIN CONTROL VOLTAGE GND AD8334 Typical Board Test Connections (One Channel Shown) Rev Page PROBE POWER SUPPLY +5V DIFFERENTIAL PROBE POWER SUPPLY GND ...

Page 51

AD8334 EVALUATION BOARD PCB LAYERS Figure 117. AD8334-EVALZ Primary Side Copper Figure 118. AD8334-EVALZ Secondary Side Copper AD8331/AD8332/AD8334 Figure 119. AD8334-EVALZ Inner Layer 1Copper Figure 120. AD8334-EVALZ Inner Layer 2 Copper Rev Page ...

Page 52

AD8331/AD8332/AD8334 Figure 121. AD8334-EVALZ Component Side Silkscreen Rev Page ...

Page 53

OUTLINE DIMENSIONS PIN 1 0.15 0.05 COPLANARITY 0.065 (1.65) 0.049 (1.25) 0.010 (0.25) 0.004 (0.10) 0.025 (0.64) COPLANARITY 0.004 (0.10) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETERS DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE ...

Page 54

AD8331/AD8332/AD8334 PIN 1 INDICATOR 12° MAX 1.00 0.85 0.80 SEATING PLANE BSC SQ PIN 1 INDICATOR 1.00 12° MAX 0.85 0.80 SEATING PLANE 5.00 BSC SQ 0.60 MAX 24 0.50 BSC TOP 4.75 VIEW BSC SQ 0.50 0.40 17 0.30 ...

Page 55

... ORDERING GUIDE 1 Model Temperature Range AD8331ARQ –40°C to +85°C AD8331ARQ-REEL –40°C to +85°C AD8331ARQ-REEL7 –40°C to +85°C AD8331ARQZ –40°C to +85°C AD8331ARQZ-RL –40°C to +85°C AD8331ARQZ-R7 –40°C to +85°C AD8331-EVALZ AD8332ACP-R2 –40°C to +85°C AD8332ACP-REEL – ...

Page 56

AD8331/AD8332/AD8334 NOTES ©2003–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D03199-0-10/10(G) Rev Page ...

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