Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp, differential amplifier Differential LFCSP 8 (3x3)

High Speed Difference Amplifier with Input

Short to Battery Protection

Data Sheet

ADA4830-1

Rev. 0

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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

−3 dB bandwidth of 84 MHz

220 V/µs slew rate (2 V step)

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

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The ADA4830-1 is a monolithic high speed difference amplifier

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 ADA4830-1 is intended for use

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 combines the high speed and the precision that

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 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 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 can withstand direct short to

battery voltages as high as 18 V on its input pins.

The ADA4830-1 is 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. 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 ADA4830-1 presents a gain of 0.5 V/V at its 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 ADA4830-1 is available in a 3 mm × 3 mm, 8-lead LFCSP

package and is specified for operation over the automotive

temperature range of −40°C to +125°C.

STBENA +VS

GND

+VS

R/2

INN

INP

VREF

BUFFER

VOUT

ADA4830-1

10020-001

Summary of content (16 pages)

PAGE 1
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 −3 dB bandwidth of 84 MHz 220 V/µs slew rate (2 V step) 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.
PAGE 2
ADA4830-1 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Overvoltage (Short to Battery) Protection .............................. 10 Applications ....................................................................................... 1 Short to Battery Output Flag .................................................... 10 Functional Block Diagram ..............................................................
PAGE 3
Data Sheet ADA4830-1 SPECIFICATIONS 5 V OPERATION TA = 25°C, +VS = 5 V, RL = 1 kΩ, VREF = 2.5 V (floating), VINCM = +VS/2, RSTB = 5 kΩ to +VS, unless otherwise specified. Table 1. Parameter DYNAMIC PERFORMANCE −3 dB Large Signal Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate (tR/tF) Settling Time to 0.
PAGE 4
ADA4830-1 Data Sheet 3.3 V OPERATION TA = 25°C, +VS = 3.3 V, RL = 1 kΩ, VREF = 2.5 V (floating), VINCM = +VS/2, RSTB = 5 kΩ to +Vs, unless otherwise specified. Table 2. Parameter DYNAMIC PERFORMANCE −3 dB Large Signal Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate (tR/tF) Settling Time to 0.
PAGE 5
Data Sheet ADA4830-1 ABSOLUTE MAXIMUM RATINGS Rating 6V 22 V −10 V +VS + 0.3 V See Figure 2 −65°C to +125°C −40°C to +125°C 260°C 150°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied.
PAGE 6
ADA4830-1 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS VREF 1 8 +VS INP 2 ADA4830-1 7 ENA INN 3 TOP VIEW (Not to Scale) 6 VOUT 5 STB NOTES 1. EXPOSED PAD ON BOTTOM SIDE OF PACKAGE. NOT CONNECTED ELECTRICALLY, BUT SHOULD BE SOLDERED TO A METALIZED AREA ON THE PCB TO MINIMIZE THERMAL RESISTANCE. 10020-003 GND 4 Figure 3. Pin Configuration Table 5. Pin Function Descriptions Pin No. 1 Mnemonic VREF 2 3 4 5 INP INN GND STB 6 7 8 VOUT ENA +VS EPAD Description Voltage Reference Input.
PAGE 7
Data Sheet ADA4830-1 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, +VS = 5 V, RL = 1 kΩ, VREF = 2.5 V (floating), VINCM = +VS/2, RSTB = 5 kΩ to +VS unless otherwise specified. 3 3 RLOAD = 1kΩ RLOAD = 1kΩ 0 NORMALIZED GAIN (dB) RLOAD = 150Ω –6 –9 –12 +VS = 5V GAIN = 0.5V/V VIN = 200mV p-p –15 –18 0.1 1 RLOAD = 150Ω –3 –6 –9 –12 –15 10 FREQUENCY (MHz) 100 VIN = 1V p-p –18 0.1 Figure 4. Small Signal Frequency Response vs. Load 1 10 FREQUENCY (MHz) 100 Figure 7.
PAGE 8
ADA4830-1 Data Sheet –25 6 –30 COMMON-MODE REJECTION (dB) 7 CL = 68pF 3 CL = 47pF 2 CL = 22pF 1 0 –1 CL = 10pF VIN = 1V p-p RLOAD = 150Ω –2 –3 0.1 10 FREQUENCY (MHz) –40 –45 +VS = 3.3V –55 –60 +VS = 5.5V –70 –12 –10 –8 100 –6 –4 –2 0 2 4 6 8 10 12 14 INPUT COMMON-MODE VOLTAGE (V) Figure 13. Small Signal CMR vs. VINCM and Supply Voltage 0 0.1 VINP = 1V p-p ENA = 0V –10 0 –20 –0.1 GAIN (dB) –0.2 –30 –40 –0.3 –50 –0.4 1 10 FREQUENCY (MHz) 100 –70 0.
PAGE 9
Data Sheet ADA4830-1 40 +VS = 3.3V VOUT = 1V p-p RLOAD = 1kΩ RLOAD = 150Ω 2.5 OUTPUT VOLTAGE (V) OUTPUT OFFSET VOLTAGE (mV) 2.7 2.3 2.1 1.9 1.7 20 30 40 50 60 70 80 90 TIME (ns) 30 20 VDD = 3.3V 10 0 VDD = 5V –10 –20 –12 –10 –8 10020-020 1.5 10 RLOAD = 1kΩ VREF PIN BYPASSED TO GND THROUGH 4.7µF CAPACITOR –6 –4 –2 0 2 4 6 8 10 12 14 INPUT COMMON-MODE VOLTAGE (V) Figure 16. Pulse Response at +VS = 3.3 V 10020-033 2.9 Figure 19.
PAGE 10
ADA4830-1 Data Sheet THEORY OF OPERATION CORE AMPLIFIER SHORT TO BATTERY OUTPUT FLAG At the core of the ADA4830-1 is a high speed, rail-to-rail op amp that is built on a 0.35 μm CMOS process. Together with the core amplifier, the ADA4830-1 combines four highly matched on-chip resistors into a difference amplifier function. Commonmode range extension at its inputs is achieved by employing a resistive attenuator.
PAGE 11
Data Sheet ADA4830-1 APPLICATIONS INFORMATION METHODS OF TRANSMISSION Fully Differential Mode Pseudo Differential Mode (Unbalanced Source Termination) The differential inputs of the ADA4830-1 allow full balanced transmission using any differential source. In this configuration, the differential input termination is equal to twice the source impedance of each output. For example, a source with 37.5 Ω back termination resistors in each leg should be terminated with a differential resistance of 75 Ω.
PAGE 12
ADA4830-1 Data Sheet Approximate minimum and maximum CM voltages are shown in Table 6 for several common supply voltages. Table 6. +VS (V) 3.0 3.0 3.3 3.3 3.6 3.6 5.0 5.0 VINCM(MIN) (V) –7.0 –4.9 –7.6 –5.6 –8.2 –6.4 –10 –9.9 VINCM(MAX) (V) 2.8 4.9 3.6 5.6 4.5 6.4 8.7 9.9 Floating (default condition). INPUT COMMON-MODE VOLTAGE (V) 15 VREF PIN FLOATING 5 The power-down, or enable/disable (ENA) pin, is internally pulled up to +VS through a 250 kΩ resistor.
PAGE 13
Data Sheet ADA4830-1 TYPICAL APPLICATIONS CIRCUITS STB FLAG (OUTPUT) +VS (2.9V TO 5.5V) ENABLE (INPUT) 4.7kΩ + 2.2µF ENA 0.1µF +VS STB +VS VREF DRIVER PCB 75Ω SINGLE ENDED AMPLIFIER 4.7µF POSITIVE WIRE INP + VOUT TO VIDEO DECODER 75Ω 0.1µF − INN NEGATIVE WIRE 10020-038 ADA4830-1 GND Figure 25. Typical Application with Pseudo Differential Input ENABLE (INPUT) STB FLAG (OUTPUT) +VS (2.9V TO 5.5V) 2.2µF 4.7kΩ + ENA 0.1µF +VS STB +VS VREF DRIVER PCB 37.
PAGE 14
ADA4830-1 ENABLE (INPUT) Data Sheet STB FLAG (OUTPUT) +VS (2.9V TO 5.5V) 2.2µF 4.7kΩ AVDD _1.8V 0.1µF 0.1µF ENA DVDDIO DVDD _1.8V + +VS 10nF 0.1µF 0.1µF 10nF 10nF STB +VS PVDD _1.8V DVDD _3.3V VREF INN 24 ADA4830-1 25 RESET KEEP VREFN AND VREFP CAPACITORS AS CLOSE AS POSSIBLE TO THE ADV7180 AND ON THE SAME SIDE OF THE PCB AS THE ADV7180. 21 AIN2 RESET VREFN 10nF 18 22 30 P0 P1 P2 P3 P4 P5 P6 P7 AIN3 P[0:7] 16 15 10 9 8 7 6 5 P0 P1 P2 P3 P4 P5 P6 P7 YCrCb 8-BIT 656 DATA 0.
PAGE 15
Data Sheet ADA4830-1 ENABLE (INPUT) +VS (2.7V TO 3.6V) 2.2µF + ENA ENABLE (INPUT) STB FLAG (OUTPUT) 0.1µF +VS +VS (2.9V TO 5.5V) 2.2µF STB STB FLAG (OUTPUT) 4.7kΩ + ENA 0.1µF +VS STB +VS FROM IMAGER OR VIDEO ENCODER VREF +IN RT LPF –OUT 37.5Ω − 75Ω TWISTED PAIR 4.7µF + INP VOUT TO VIDEO DECODER 75Ω 37.5Ω +OUT –IN 0.1µF − INN ADA4830-1 LPF GND GND Figure 28. Differential Video Filter Driver and ADA4830-1 Difference Amplifier Rev.
PAGE 16
ADA4830-1 Data Sheet PACKAGING AND ORDERING INFORMATION OUTLINE DIMENSIONS 2.44 2.34 2.24 3.10 3.00 SQ 2.90 0.50 BSC 8 5 0.50 0.40 0.30 0.80 0.75 0.70 1 4 BOTTOM VIEW TOP VIEW SEATING PLANE 1.70 1.60 1.50 EXPOSED PAD 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.203 REF 0.30 0.25 0.20 PIN 1 INDICATOR (R 0.15) FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET.