Analog Devices AD8079BR-REEL7, AD8079BR-REEL, AD8079BR, AD8079AR-REEL7, AD8079AR-REEL Datasheet

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AD8079
+IN1
GND
GND
+IN2
OUT1
+V
S
–V
S
OUT2
Dual 260 MHz
Gain = +2.0 & +2.2 Buffer
AD8079
FEATURES Factory Set Gain
AD8079A: Gain = +2.0 (Also +1.0 & –1.0) AD8079B: Gain = +2.2 (Also +1 & –1.2) Gain of 2.2 Compensates for System Gain Loss Minimizes External Components Tight Control of Gain and Gain Matching (0.1%)
Optimum Dual Pinout
Simplifies PCB Layout Low Crosstalk of –70 dB @ 5 MHz
Excellent Video Specifications (R
= 150 V)
L
Gain Flatness 0.1 dB to 50 MHz
0.01% Differential Gain Error
0.028 Differential Phase Error Low Power of 50 mW/Amplifier (5 mA) High Speed and Fast Settling
260 MHz, –3 dB Bandwidth 750 V/ms Slew Rate (2 V Step), 800 V/ms (4 V Step) 40 ns Settling Time to 0.1% (2 V Step)
Low Distortion of –65 dBc THD, f
= 5 MHz
C
High Output Drive of Over 70 mA
Drives Up to 8 Back-Terminated 75 V Loads (4 Loads/
Side) While Maintaining Good Differential Gain/
Phase Performance (0.01%/0.178) High ESD Tolerance (5 kV) Available in Small 8-Pin SOIC
APPLICATIONS Differential A-to-D Driver Video Line Driver Differential Line Driver Professional Cameras Video Switchers Special Effects RF Receivers

PRODUCT DESCRIPTION

The AD8079 is a dual, low power, high speed buffer designed to operate on ±5 V supplies. The AD8079’s pinout offers excel­lent input and output isolation compared to the traditional dual amplifier pin configuration. With two ac ground pins separating both the inputs and outputs, the AD8079 achieves very low crosstalk of less than –70 dB at 5 MHz.
Additionally, the AD8079 contains gain setting resistors factory set at G = +2.0 (A grade) or Gain = +2.2 (B grade) allowing circuit configurations with minimal external components. The B grade gain of +2.2 compensates for gain loss through a system by providing a single-point trim. Using active laser trimming of these resistors, the AD8079 guarantees tight control of gain and channel-channel gain matching. With its performance and con­figuration, the AD8079 is well suited for driving differential

FUNCTIONAL BLOCK DIAGRAM

8-Pin Plastic SOIC
cables and transformers. Its low distortion and fast settling are ideal for buffering high speed dual or differential A-to-D con­verters.
The AD8079 features a unique transimpedance linearization circuitry. This allows it to drive video loads with excellent differ­ential gain and phase performance of 0.01% and 0.02° on only 50 mW of power per amplifier. It features gain flatness of 0.1 dB to 50 MHz. This makes the AD8079 ideal for professional video electronics such as cameras and video switchers.
The AD8079 offers low power of 5 mA/amplifier (V
= ±5 V)
S
and can run on a single +12 V power supply while delivering over 70 mA of load current. All of this is offered in a small 8-pin SOIC package. These features make this amplifier ideal for por­table and battery powered applications where size and power are critical.
The outstanding bandwidth of 260 MHz along with 800 V/µs of slew rate make the AD8079 useful in many general purpose high speed applications where dual power supplies of ± 3 V to ±6 V are required.
The AD8079 is available in the industrial temperature range of –40°C to +85°C.
1
0
RL = 100 VIN = 50mV rms
0.1
0 –0.1
–0.2
–0.3
–0.4
NORMALIZED FLATNESS – dB
–0.5
50
1M
50
SIDE 1
FREQUENCY – Hz
SIDE 1
SIDE 2
SIDE 2
–1
–2 –3
–4 –5
–6
–7
–8
NORMALIZED FREQUENCY RESPONSE – dB
–9
1G10M 100M
REV. A
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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Figure 1. Frequency Response and Flatness
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1996
AD8079–SPECIFICA TIONS
(@ TA = +258C, VS = 65 V, RL = 100 V, unless otherwise noted)
AD8079A/AD8079B
Parameter Conditions Min Typ Max Units
DYNAMIC PERFORMANCE
–3 dB Small Signal Bandwidth V Bandwidth for 0.1 dB Flatness V Large Signal Bandwidth V Slew Rate V
Settling Time to 0.1% V
= 50 mV rms 260 MHz
IN
= 50 mV rms 50 MHz
IN
= 1 V rms 100 MHz
IN
= 2 V Step 750 V/µs
O
= 4 V Step 800 V/µs
V
O
= 2 V Step 40 ns
O
Rise & Fall Time VO = 2 V Step 2.5 ns
NOISE/HARMONIC PERFORMANCE
Total Harmonic Distortion f
= 5 MHz, VO = 2 V p-p –65 dBc
C
Crosstalk, Output to Output f = 5 MHz –70 dB Input Voltage Noise f = 10 kHz 2.0 nV/ Input Current Noise f = 10 kHz, +In 2.0 pA/ Differential Gain Error NTSC, R
NTSC, R
Differential Phase Error NTSC, R
= 150 0.01 %
L
= 75 0.01 %
L
= 150 0.02 Degree
L
RL = 75 0.07 Degree
DC PERFORMANCE
Offset Voltage, RTO 10 15 mV
T
MIN–TMAX
10 20 mV Offset Drift, RTO 20 µV/°C +Input Bias Current 3.0 6.0 ±µA
T
MIN–TMAX
10 ±µA
Gain No Load 1.998/2.198 2.0/2.2 2.002/2.202 V/V
= 150 1.995/2.195 2.0/2.2 2.005/2.205 V/V
R
L
Gain Matching Channel-to-Channel, No Load 0.1 %
Channel-to-Channel, RL = 150 0.5 %
Hz Hz
INPUT CHARACTERISTICS
+Input Resistance +Input 10 M +Input Capacitance +Input 1.5 pF
OUTPUT CHARACTERISTICS
Output Voltage Swing R Output Current
Short Circuit Current
1
1
= 150 2.7 3.1 ±V
L
= 75 2.8 ±V
R
L
70 mA
85 110 mA
POWER SUPPLY
Operating Range ±3.0 ±6.0 V Quiescent Current/Both Amplifiers T Power Supply Rejection Ratio, RTO +V
+Input Current T
NOTES
1
Output current is limited by the maximum power dissipation in the package. See the power derating curves.
Specifications subject to change without notice.
MIN–TMAX
= +4 V to +6 V, –VS = –5 V 49 69 dB
S
= –4 V to –6 V, +VS = +5 V 40 50 dB
–V
S
MIN–TMAX
10.0 11.5 mA
0.1 0.5 µA/V
–2–
REV. A
AD8079
WARNING!
ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.6V
Internal Power Dissipation
2
1
Small Outline Package (R) . . . . . . . . . . . . . . . . . . 0.9 Watts
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±V
S
Output Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves
Storage Temperature Range . . . . . . . . . . . . .–65°C to +125°C
Operating Temperature Range (A Grade) . . . –40°C to +85°C
Lead Temperature Range (Soldering10 sec) . . . . . . . . +300°C
NOTES
1
Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2
Specification is for device in free air: 8-Pin SOIC Package: θJA = 160°C/Watt

MAXIMUM POWER DISSIPATION

The maximum power that can be safely dissipated by the AD8079 is limited by the associated rise in junction tempera­ture. The maximum safe junction temperature for plastic encapsulated devices is determined by the glass transition tem­perature of the plastic, approximately +150°C. Exceeding this limit temporarily may cause a shift in parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of +175°C for an extended period can result in device failure.
While the AD8079 is internally short circuit protected, this may not be sufficient to guarantee that the maximum junction temperature (+150°C) is not exceeded under all conditions. To ensure proper operation, it is necessary to observe the maximum power derating curves.
2.0
1.5
1.0
8-PIN SOIC PACKAGE
0.5
TJ = +150°C
9
MAXIMUM POWER DISSIPATION – Watts
0
–50 90–40 –30 –20 –10 0 10 20 30 40 50 60 70
AMBIENT TEMPERATURE – °C
Figure 2. Plot of Maximum Power Dissipation vs. Temperature

ORDERING GUIDE

Temperature Package Package
Model Gain Range Description Option
AD8079AR G = +2.0 –40°C to +85°C 8-Pin Plastic SOIC SO-8 AD8079AR-REEL G = +2.0 –40°C to +85°C REEL SOIC SO-8 AD8079AR-REEL7 G = +2.0 –40°C to +85°C REEL 7 SOIC SO-8 AD8079BR G = +2.2 –40°C to +85°C 8-Pin Plastic SOIC SO-8 AD8079BR-REEL G = +2.2 –40°C to +85°C REEL SOIC SO-8 AD8079BR-REEL7 G = +2.2 –40°C to +85°C REEL 7 SOIC SO-8
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD8079 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
80
REV. A
–3–
AD8079
V
IN
PULSE
GENERATOR
TR/TF = 250ps
50
2
AD8079
1
+5V
–5V
1
0
10µF
0.1µF
7
8
0.1µF
6
10µF
R
L
= 100
RL = 100 VIN = 50mV rms
0.1
0 –0.1
–0.2
–0.3
–0.4
NORMALIZED FLATNESS – dB
–0.5
50
1M
50
SIDE 1
FREQUENCY – Hz
SIDE 1
SIDE 2
SIDE 2
–1
–2 –3
–4 –5
–6
–7
–8
NORMALIZED FREQUENCY RESPONSE – dB
–9
1G10M 100M
Figure 3. Test Circuit
100mV STEP
SIDE 1
SIDE 2
20mV
5ns
Figure 4. 100 mV Step Response
1V STEP
SIDE 1
Figure 6. Frequency Response and Flatness
–50
RL = 100
–60
–70
–80
–90
DISTORTION – dBc
–100
–110
10k 100M100k 1M 10M
2ND HARMONIC
3RD HARMONIC
FREQUENCY – Hz
Figure 7. Distortion vs. Frequency, RL = 100
–60
RL = 1k
= 2Vp-p
V
OUT
–70
SIDE 2
200mV
5ns
Figure 5. 1 V Step Response
–4–
–80
2ND HARMONIC
–90
–100
DISTORTION – dBc
–110
–120
100k 100M10M1M10k
FREQUENCY – Hz
3RD HARMONIC
Figure 8. Distortion vs. Frequency, RL = 1 k
REV. A
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