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ADA4830-2BCPZ-R2

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
High Speed Difference Amplifier with Input
Short-to-Battery Protection
Data Sheet
ADA4830-1/ADA4830-2
Rev. C
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.
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 0.50 V/V gain
−3 dB bandwidth of 84 MHz
250 V/µs slew rate (2 V step)
Excellent video specifications
0.1 dB flatness to 28 MHz
SNR of 73 dB to 15 MHz
Differential gain/phase of 0.1%/0.1°
Wide supply range: 2.9 V to 5.5 V
Enable/output disable mode
Space saving 3 mm × 3 mm LFCSP package
Wide operating temperature range: −40°C to +125°C
Qualified for automotive applications
APPLICATIONS
Automotive vision systems
Automotive infotainment
Surveillance systems
GENERAL DESCRIPTION
The ADA4830-1 (single) and ADA4830-2 (dual) are monolithic,
high speed difference amplifiers that integrate input overvoltage
(short-to-battery) protection of up to 18 V with a wide input
common-mode voltage range and excellent ESD robustness.
They are intended for use as receivers 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 and ADA4830-2 combine high speed
and precision, which allows for 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 and ADA4830-2 employs fast switching circuitry to
clamp and hold internal voltage nodes at a safe level when an input
overvoltage condition is detected. This protection allows the inputs
of the ADA4830-1 and ADA4830-2 to be directly connected to a
remote video source, such as a rearview camera, without the
need for large expensive series capacitors. The ADA4830-1 and
ADA4830-2 can withstand direct short-to-battery voltages as
high as 18 V on their input pins.
The ADA4830-1 and ADA4830-2 are designed to operate at supply
voltages as low as 2.9 V and as high as 5.5 V, using only 6.8 mA
of supply current per channel. These devices provide true single-
supply capability, allowing the input signal to extend 8.5 V
FUNCTIONAL BLOCK DIAGRAM
STBENA +VS
GND
+VS
R/2
R
R/2
R
INN
INP
VREF
×1
VOUT
ADA4830-1
10020-001
Figure 1.
STB1ENA1 +VS1
STB2ENA2 +VS2
GND2
GND1
+VS
R/2
R
R/2
R
INN1
INP1
VREF1
×1
VOUT1
VOUT2
ADA4830-2
+VS
10020-102
R
R/2
R
INN2
INP2
VREF2
×1
R/2
Figure 2.
below ground 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 ADA4830-1 and ADA4830-2 present a gain of 0.50 V/V at their
output. This is designed to keep the video signal within the allowed
range of the video decoder, which is typically 1 V p-p or less.
The ADA4830-1W and ADA4830-2W are automotive grade
version, qualified for automotive applications. See the
Automotive Products section for more details.
The ADA4830-1 and ADA4830-2 are available in 3 mm × 3 mm
LFCSP packages, 8-lead and 16-lead, respectively, and are specified
for operation over the automotive temperature range of −40°C
to +125°C.
ADA4830-1/ADA4830-2 Data Sheet
Rev. C | Page 2 of 22
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
5 V Operation ............................................................................... 3
3.3 V Operation ............................................................................ 4
Absolute Maximum Ratings ....................................................... 6
Thermal Resistance ...................................................................... 6
Maximum Power Dissipation ..................................................... 6
ESD Caution .................................................................................. 6
Pin Configurations and Function Descriptions ........................... 7
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 13
Core Amplifier ............................................................................ 13
Overvoltage (Short-to-Battery) Protection ............................. 13
Short-to-Battery Output Flag ................................................... 13
ESD Protection ........................................................................... 13
Power Supply Pins (ADA4830-2).............................................. 13
Applications Information .............................................................. 14
Methods of Transmission .......................................................... 14
Voltage Reference (VREF Pin) ................................................. 14
Input Common-Mode Range ................................................... 15
Short-to-Battery Output Flag Pin ............................................ 15
Enable/Disable Modes (ENA Pin) ........................................... 15
PCB Layout ................................................................................. 15
Exposed Paddle (EPAD) Connection ...................................... 15
Using the ADA4830-2 as a Low Cost Video Switch ............... 16
Driving Capacitive Loads .......................................................... 17
Typical Applications Circuits ........................................................ 18
Fully DC-Coupled Transmission Line .................................... 20
Packaging and Ordering Information ......................................... 21
Outline Dimensions ................................................................... 21
Ordering Guide .......................................................................... 21
Automotive Products ................................................................. 22
REVISION HISTORY
6/12—Rev. B to Rev. C
Added ADA4830-2W......................................................... Universal
Changes to Features ..................................................................................... 1
Changes to Ordering Guide ..................................................................... 21
4/12—Rev. A to Rev. B
Changes to Features Section and Generation Description Section . 1
Changes to Table 1 ....................................................................................... 3
Changes to Table 2 ....................................................................................... 4
Changes to Table 4 ....................................................................................... 6
Changes to Figure 28 ................................................................................. 12
Changes to ESD Protection Section ....................................................... 13
Changes to Ordering Guide ..................................................................... 21
Added Automotive Products Section .................................................... 22
1/12—Rev. 0 to Rev. A
Added ADA4830-2 ............................................................. Universal
Changes to Features Section and Figure 1..................................... 1
Added Figure 2; Renumbered Sequentially .................................. 1
Changes to Table 1 ............................................................................ 3
Changes to Table 2 ............................................................................ 4
Added Supply Voltage Delta Parameter, Table 3; Renumbered
Sequentially ....................................................................................... 5
Added Figure 5 and Table 6 ............................................................. 7
Changes to Typical Performance Characteristics Section ........... 8
Added Figure 23 ............................................................................. 10
Added Figure 24 to Figure 29 ....................................................... 11
Changes to Pseudo Differential Mode (Unbalanced Source
Termination) Section, Fully Differential Mode Section, and
Voltage Reference (VREF Pin) Section ....................................... 13
Changes to Input Common-Mode Range Section, Table 7,
Short-to-Battery Output Flag Pin Section, and Table 9 ............ 14
Added Figure 34 ............................................................................. 15
Added Driving Capacitive Loads Section and Figure 35 to
Figure 38 .......................................................................................... 16
Changes to Figure 39 and Figure 40 ............................................. 17
Changes Typical Application Circuits Section and Figure 41 ......... 18
Added Fully DC-Coupled Transmission Line Section ..................... 19
Changes to Figure 42 ................................................................................. 19
Updated Outline Dimensions ....................................................... 20
Changes to Ordering Guide .......................................................... 20
10/11—Revision 0: Initial Version
Data Sheet ADA4830-1/ADA4830-2
Rev. C | Page 3 of 22
SPECIFICATIONS
5 V OPERATION
T
A
= 25°C, +V
S
= 5 V, R
L
= 1 kΩ, V
REF
= 2.5 V (floating), V
INCM
= +V
S
/2, R
STB
= 5 kΩ to +V
S
, unless otherwise specified.
Table 1.
Parameter Test Conditions/Comments Min Typ Max Unit
DYNAMIC PERFORMANCE
−3 dB Large Signal Bandwidth V
OUT
= 0.5 V p-p, R
L
= 150 Ω 64 71 MHz
ADA4830-1W/ADA4830-2W only T
MIN
to T
MAX
56 MHz
V
OUT
= 0.1 V p-p, R
L
= 1 kΩ 84 MHz
V
OUT
= 0.1 V p-p, R
L
= 150 Ω 65 74 MHz
ADA4830-1W/ADA4830-2W only T
MIN
to T
MAX
60 MHz
Bandwidth for 0.1 dB Flatness V
OUT
= 0.5 V p-p, R
L
= 150 Ω 28 MHz
Slew Rate (t
R
/t
F
) V
OUT
= 2 V step 196/200 250/300 V/µs
ADA4830-1W/ADA4830-2W only T
MIN
to T
MAX
164/220 V/µs
Settling Time to 0.1% V
OUT
= 2 V step 25 ns
NOISE/DISTORTION PERFORMANCE
Output Voltage Noise f = 1 MHz 28 nV/√Hz
Differential Gain Error (NTSC) R
L
= 150 Ω, V
IN
= 1 V p-p 0.1 %
Differential Phase Error (NTSC) R
L
= 150 Ω, V
IN
= 1 V p-p 0.1
Degrees
Signal-to-Noise Ratio f = 100 kHz to 15 MHz, V
OUT
= 0.5 V p-p 73 dB
DC PERFORMANCE
Nominal Gain V
IN
to V
OUT
0.49 0.50 0.51 V/V
ADA4830-1W/ADA4830-2W only T
MIN
to T
MAX
0.49 0.51 V/V
Output Bias Voltage 2.45 2.50 2.55 V
ADA4830-1W/ADA4830-2W only T
MIN
to T
MAX
2.44 2.56 V
INPUT CHARACTERISTICS
Input Resistance (Differential Mode) 6.7 kΩ
Input Resistance (Common Mode) 2 kΩ
Input Common-Mode Voltage Range V
REF
voltage adjusted to optimized range −10 +9.5 V
ADA4830-1W/ADA4830-2W only T
MIN
to T
MAX
−10 +9.5 V
Common-Mode Rejection (CMR)
IN
42
65
dB
ADA4830-1W/ADA4830-2W only T
MIN
to T
MAX
42 dB
SHORT-TO-BATTERY CHARACTERISTICS
Input Current V
IN
= 18 V (short-to-battery) 4.1 mA
Protected Input Voltage Range −9 +20 V
MIN
MAX
−9
+20
V
Short-to-Battery Output Flag Trigger
Level
Minimum V
IN
needed to signal an input fault
condition
9.8 10.3 10.8 V
ADA4830-1W/ADA4830-2W only T
MIN
to T
MAX
9.8 10.8 V
VOLTAGE REFERENCE INPUT
Input Voltage Range 0.2 to 3.9 V
Input Resistance 20 kΩ
Gain V
REF
to V
OUT
1 V/V
LOGIC OUTPUT/INPUT CHARACTERISTICS
STB V
OH
V
IN
≤ 9.8 V (normal operation) 5.0 V
STB V
OL
V
IN
≥ 10.8 V (fault condition), ADA4830-1/ADA4830-2 110/253 mV
ENA V
IH
Voltage to enable device ≥3.0 V
ENA V
IL
Voltage to disable device ≤1.0 V
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ADA4830-2BCPZ-R2

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Manufacturer:
Analog Devices Inc.
Description:
Differential Amplifiers Low Cost High Spd Speed Diff Amp
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