ada4830-1 Analog Devices, Inc., ada4830-1 Datasheet

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ada4830-1

Manufacturer Part Number
ada4830-1
Description
High Speed Difference Amplifier With Input Short To Battery Protection
Manufacturer
Analog Devices, Inc.
Datasheet
Data Sheet
FEATURES
Input overvoltage (short to battery) protection of up to 18 V
Short to battery output flag for wire diagnostics
Wide input common-mode range with single 5 V supply
High performance video amplifier with 0.5 V/V gain
Excellent video specifications
0.1 dB flatness to 20 MHz
SNR of 73 dB to 15 MHz
Differential gain of 0.1%
Differential phase of 0.1°
Wide supply range: 2.9 V to 5.5 V
Power-down mode
Space saving 3 mm × 3 mm LFCSP package
Wide operating temperature range: −40 °C to +125°C
APPLICATIONS
Automotive vision systems
Automotive infotainment
Surveillance systems
GENERAL DESCRIPTION
The
that integrates input overvoltage (short to battery) protection of
up to 18 V with a wide input common-mode voltage range and
excellent ESD robustness. The
as a receiver for differential or pseudo differential CVBS and
other high speed video signals in harsh, noisy environments
such as automotive infotainment and vision systems. The
ADA4830-1
allow accurate reproduction of CVBS video signals, yet rejects
unwanted common-mode error voltages.
The short to battery protection that is integrated into the
ADA4830-1
internal voltage nodes at a safe level when an input overvoltage
condition is detected. This protection allows the inputs of the
ADA4830-1
such as a rearview camera, without the need for large expensive
Rev. 0
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.
−3 dB bandwidth of 84 MHz
220 V/µs slew rate (2 V step)
ADA4830-1
combines the high speed and the precision that
employs fast switching circuitry to clamp and hold
to be directly connected to a remote video source,
is a monolithic high speed difference amplifier
ADA4830-1
is intended for use
High Speed Difference Amplifier with Input
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
series capacitors. The
battery voltages as high as 18 V on its input pins.
The
as 2.9 V and as high as 5.5 V, using only 6.8 mA of supply
current per channel. The device provides true single-supply
capability, allowing the input signal to extend 8.5 V below the
negative rail and to 8.5 V above ground on a single 5 V supply.
At the output, the amplifier can swing to within 250 mV of
either supply rail into a 150 Ω load.
The
designed to keep the video signal within the allowed range of
the video decoder, which is typically 1 V p-p or less.
The
package and is specified for operation over the automotive
temperature range of −40°C to +125°C.
ADA4830-1
ADA4830-1
ADA4830-1
Short to Battery Protection
VREF
INN
INP
FUNCTIONAL BLOCK DIAGRAM
is designed to operate at supply voltages as low
presents a gain of 0.5 V/V at its output. This is
is available in a 3 mm × 3 mm, 8-lead LFCSP
+VS
ENA
ADA4830-1
BUFFER
©2011 Analog Devices, Inc. All rights reserved.
R
R
Figure 1.
GND
+VS
ADA4830-1
can withstand direct short to
R/2
R/2
STB
ADA4830-1
www.analog.com
VOUT

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ada4830-1 Summary of contents

Page 1

... ADA4830-1 designed to keep the video signal within the allowed range of the video decoder, which is typically 1 V p-p or less. The ADA4830-1 package and is specified for operation over the automotive temperature range of −40°C to +125°C. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781 ...

Page 2

... ADA4830-1 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... Operation ............................................................................... 3 3.3 V Operation ............................................................................ 4 Absolute Maximum Ratings ....................................................... 5 Thermal Resistance ...................................................................... 5 Maximum Power Dissipation ..................................................... 5 ESD Caution .................................................................................. 5 Pin Configuration and Function Descriptions ............................. 6 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 10 Core Amplifier ............................................................................ 10 REVISION HISTORY 10/11— ...

Page 3

... GND L Sourcing/sinking Peaking ≤ Operation outside of this range results in performance degradation Enabled (ENA = 5 V), no load Disabled (ENA = (short to battery 4 5.5 V, VREF is forced to 2 Rev Page ADA4830-1 , unless otherwise specified. S Min Typ Max 220 25 28 0.1 0 ...

Page 4

... ADA4830-1 3.3 V OPERATION T = 25° 3 kΩ REF Table 2. Parameter DYNAMIC PERFORMANCE −3 dB Large Signal Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate ( Settling Time to 0.1% NOISE/DISTORTION PERFORMANCE Output Voltage Noise Differential Gain Error (NTSC) Differential Phase Error (NTSC) Signal-to-Noise Ratio ...

Page 5

... JEDEC standard 4-layer board. θ 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 θ Unit 0 JA 116 °C/W ADA4830-1 ESD CAUTION Rev Page ADA4830 the sum of the D ) times the S ). The power dissipated due to load drive S values are approximate AMBIENT TEMPERATURE (°C) Figure 2. Maximum Power Dissipation vs. ...

Page 6

... Positive Power Supply. Bypass this pin with a 0.1 µF capacitor to GND. EPAD Exposed Pad. The exposed pad is located on bottom side of package. The pad is not connected electrically but should be soldered to a metalized area on the PCB to minimize thermal resistance. VREF 1 8 +VS ADA4830-1 INP 2 7 ENA TOP VIEW INN 3 ...

Page 7

... p-p IN –18 0 FREQUENCY (MHz) Figure 8. Large Signal Frequency Response vs. Supply Voltage 3 0 –3 –6 –9 +125°C –12 –15 +25°C –18 – p 150Ω LOAD – 100 FREQUENCY (MHz 3 ADA4830-1 = 1kΩ 100 = 3.3V S 100 –45°C ...

Page 8

... ADA4830 68pF 47pF 22pF – 10pF L – p 0pF 150Ω LOAD –3 0 FREQUENCY (MHz) Figure 10. Large Signal Frequency Response for Various Capacitor Loads 0.1 0 –0.1 –0.2 –0.3 –0 p 150Ω LOAD – ...

Page 9

... INPUT COMMON-MODE VOLTAGE (V) Figure 19. Output Offset Voltage : V OUT 3. INP, INN 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 ENABLE VOLTAGE (V) Figure 20. Supply Current vs. Enable Voltage ADA4830 − V REF = FLOATING 4.0 4.5 5.0 ...

Page 10

... ESD PROTECTION All pins on the ADA4830-1 protection structures connected to the power supply pins (+VS and GND). These structures provide protection during the handling and manufacturing process. ...

Page 11

... Use the positive wire or coaxial center conductor to connect the source output to the positive input (INP) of the ADA4830-1. Next, connect the negative wire or coaxial shield from the negative input (INN) back to a ground reference on the source printed circuit board (PCB) ...

Page 12

... Low (Logic 0) PCB LAYOUT As with all high speed applications, attention to PCB layout is of paramount importance. Adhere to standard high speed layout practices in designs using the ADA4830-1. A solid ground plane is recommended, and placing a 0.1 µF surface-mount, ceramic power supply, decoupling capacitor as close as possible to the 5.0 5 ...

Page 13

... ENABLE (INPUT) + 2.2µF ENA +VS +VS VREF 4.7µF INP + 75Ω − INN ADA4830-1 Figure 26. Typical Application with Fully Differential Input Rev Page ADA4830-1 STB FLAG (OUTPUT) 4.7kΩ 0.1µF STB TO VIDEO DECODER VOUT 0.1µF GND STB FLAG (OUTPUT) 4.7kΩ 0.1µF STB TO VIDEO ...

Page 14

... THE ADV7180 13 47pF 28.63636MHz 1MΩ 12 47pF D VDDIO 4kΩ 26 ≥ ADDRESS = 42h ALSB TIED HI ≥ ADDRESS = 40h ALSB TIED LOW 28 SCLK 27 SDA Figure 27. ADA4830-1 Driving an ADV7180 Rev Page _1.8V VDDIO VDD 10nF 0.1µF 10nF 0.1µF 10nF P _1.8V VDD D _3.3V VDD D _1.8V VDD A _1.8V 0.1µ ...

Page 15

... STB 75Ω TWISTED PAIR –OUT 37.5Ω − + 37.5Ω − + +OUT ADA4830-1 Rev Page STB FLAG +VS (2.9V TO 5.5V) (OUTPUT) ENABLE (INPUT) 4.7kΩ + 2.2µF 0.1µF ENA +VS STB +VS VREF 4.7µF INP VOUT 75Ω INN ADA4830-1 GND Difference Amplifier ADA4830-1 TO VIDEO DECODER 0.1µF ...

Page 16

... Lead Frame Chip CP-8-11 Scale Package [LFCSP] Evaluation Board Rev Page Data Sheet 2.44 2.34 2.24 0.50 BSC 8 1.70 EXPOSED PAD 1.60 1.50 1 FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. Branding Ordering Quantity H30 1,500 H30 250 www.analog.com/ADA4830-1 ...

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