Datasheet AD8079 (Analog Devices)

Dual 260 MHz
a
Gain = +2.0 & +2.2 Buffer AD8079 FEATURES FUNCTIONAL BLOCK DIAGRAM Factory Set Gain 8-Pin Plastic SOIC 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 +IN1 1 8 OUT1 Minimizes External Components GND 2 7 +V Tight Control of Gain and Gain Matching (0.1%) S AD8079 Optimum Dual Pinout GND 3 6 –VS Simplifies PCB Layout +IN2 4 5 OUT2 Low Crosstalk of –70 dB @ 5 MHz Excellent Video Specifications (RL = 150
V
) Gain Flatness 0.1 dB to 50 MHz 0.01% Differential Gain Error
cables and transformers. Its low distortion and fast settling are
0.02
8
Differential Phase Error
ideal for buffering high speed dual or differential A-to-D con-
Low Power of 50 mW/Amplifier (5 mA)
verters.
High Speed and Fast Settling
The AD8079 features a unique transimpedance linearization
260 MHz, –3 dB Bandwidth
circuitry. This allows it to drive video loads with excellent differ-
750 V/
m
s Slew Rate (2 V Step), 800 V/
m
s (4 V Step)
ential gain and phase performance of 0.01% and 0.02° on only
40 ns Settling Time to 0.1% (2 V Step)
50 mW of power per amplifier. It features gain flatness of 0.1 dB
Low Distortion of –65 dBc THD, fC = 5 MHz
to 50 MHz. This makes the AD8079 ideal for professional video
High Output Drive of Over 70 mA
electronics such as cameras and video switchers.
Drives Up to 8 Back-Terminated 75
V
Loads (4 Loads/ Side) While Maintaining Good Differential Gain/
The AD8079 offers low power of 5 mA/amplifier (VS = ± 5 V)
Phase Performance (0.01%/0.17
8
)
and can run on a single +12 V power supply while delivering
High ESD Tolerance (5 kV)
over 70 mA of load current. All of this is offered in a small 8-pin
Available in Small 8-Pin SOIC
SOIC package. These features make this amplifier ideal for por- table and battery powered applications where size and power are
APPLICATIONS
critical.
Differential A-to-D Driver
The outstanding bandwidth of 260 MHz along with 800 V/µs of
Video Line Driver
slew rate make the AD8079 useful in many general purpose high
Differential Line Driver
speed applications where dual power supplies of ± 3 V to ± 6 V
Professional Cameras
are required.
Video Switchers Special Effects
The AD8079 is available in the industrial temperature range of
RF Receivers
–40°C to +85°C.
PRODUCT DESCRIPTION 1
The AD8079 is a dual, low power, high speed buffer designed
0
to operate on ± 5 V supplies. The AD8079’s pinout offers excel-
RL = 100
Ω
SIDE 2 –1
lent input and output isolation compared to the traditional dual
VIN = 50mV rms SIDE 1
amplifier pin configuration. With two ac ground pins separating
–2
both the inputs and outputs, the AD8079 achieves very low
0.1 –3
crosstalk of less than –70 dB at 5 MHz.
0 –4
Additionally, the AD8079 contains gain setting resistors factory
–0.1 –5
set at G = +2.0 (A grade) or Gain = +2.2 (B grade) allowing
–0.2 –6 SIDE 2
circuit configurations with minimal external components. The
50
Ω
SIDE 1
B grade gain of +2.2 compensates for gain loss through a system
–0.3 –7 50
Ω by providing a single-point trim. Using active laser trimming of
–0.4 –8 NORMALIZED FREQUENCY RESPONSE – dB
these resistors, the AD8079 guarantees tight control of gain and
NORMALIZED FLATNESS – dB –0.5 –9
channel-channel gain matching. With its performance and con-
1M 10M 100M 1G FREQUENCY – Hz
figuration, the AD8079 is well suited for driving differential Figure 1. Frequency Response and Flatness 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
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Fax: 617/326-8703 © Analog Devices, Inc., 1996