Dual 350 MHz
Low Power Amplifier
AD8012*
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Low Power
1.7 mA/Amplifier Supply Current
Fully Specified for ꢀ5 V and +5 V Supplies
High Output Current, 125 mA
High Speed
350 MHz, –3 dB Bandwidth (G = +1)
150 MHz, –3 dB Bandwidth (G = +2)
2,250 V/ꢁs Slew Rate
+V
OUT1
1
2
3
4
8
7
6
5
S
OUT2
–IN2
+IN2
–IN1
+IN1
–V
S
AD8012
20 ns Settling Time to 0.1%
Low Distortion
–72 dBc Worst Harmonic @ 500 kHz, RL = 100 ꢂ
–66 dBc Worst Harmonic @ 5 MHz, RL = 1 kꢂ
Good Video Specifications (RL = 1 kꢂ, G = +2)
0.02% Differential Gain Error
0.06ꢃ Differential Phase Error
Gain Flatness 0.1 dB to 40 MHz
60 ns Overdrive Recovery
Low Offset Voltage, 1.5 mV
Low Voltage Noise, 2.5 nV/√Hz
Available in 8-Lead SOIC and 8-Lead MSOP
–40
–50
–60
–70
–80
–90
G = +2
= 2V p-p
V
OUT
R
= 750ꢂ
F
APPLICATIONS
XDSL, HDSL Line Drivers
ADC Buffers
Professional Cameras
CCD Imaging Systems
Ultrasound Equipment
Digital Cameras
THIRD
SECOND
PRODUCT DESCRIPTION
The AD8012 is a dual, low power, current feedback amplifier
capable of providing 350 MHz bandwidth while using only
1.7 mA per amplifier. It is intended for use in high frequency,
wide dynamic range systems where low distortion and high
speed are essential and low power is critical.
10
100
– ꢂ
1k
R
L
Figure 1. Distortion vs. Load Resistance, VS = 5 V,
Frequency = 500 kHz
With only 1.7 mA of supply current, the AD8012 also offers
exceptional ac specifications such as 20 ns settling time and
2,250 V/µs slew rate. The video specifications are 0.02% differ-
ential gain and 0.06 degree differential phase, excellent for such
a low power amplifier. In addition, the AD8012 has a low offset
of 1.5 mV.
+V
S
+
R1
+
AMP 1
R
OR
135ꢂ
= 100ꢂ
L
LINE
POWER
IN dB
V
V
REF
IN
V
OUT
The AD8012 is well suited for any application that requires high
performance with minimal power.
R2
–
Np:Ns
TRANSFORMER
–
The product is available in standard 8-lead SOIC or MSOP
packages and operates over the industrial temperature range
–40°C to +85°C.
–V
S
Figure 2. Differential Drive Circuit for XDSL Applications
*Protected under U.S. Patent Number 5,537,079.
REV. B
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