Low Power, 350 MHz
Voltage Feedback Amplifiers
AD8038/AD8039
Rev. G
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FEATURES
Low power: 1 mA supply current/amp
High speed
350 MHz, 3 dB bandwidth (G = +1)
425 V/μs slew rate
Low cost
Low noise
8 nV/√Hz @ 100 kHz
600 fA/√Hz @ 100 kHz
Low input bias current: 750 nA maximum
Low distortion
90 dB SFDR @ 1 MHz
65 dB SFDR @ 5 MHz
Wide supply range: 3 V to 12 V
Small packaging: 8-lead SOT-23, 5-lead SC70, and 8-lead SOIC
APPLICATIONS
Battery-powered instrumentation
Filters
A/D drivers
Level shifting
Buffering
Photo multipliers
FUNCTIONAL BLOCK DIAGRAM
NC 1
–IN 2
+IN 3
–VS 4
DISABLE
8
+VS
7
VOUT
6
NC
5
NC = NO CONNECT
AD8038
0
29
51-
0
01
Figure 1. 8-lead SOIC (R)
AD8038
VOUT 1
+IN 3
–VS 2
+VS
5
–IN
4
0
29
51
-0
02
Figure 2. 5-Lead SC70 (KS)
NC = NO CONNECT
VOUT1 1
–IN1 2
+IN1 3
–VS 4
+VS
8
VOUT2
7
–IN2
6
+IN2
5
AD8039
0
295
1-
0
03
Figure 3. 8-Lead SOIC (R) and 8-Lead SOT-23 (RJ)
GENERAL DESCRIPTION
The AD8038 (single) and AD8039 (dual) amplifiers are high speed
(350 MHz) voltage feedback amplifiers with an exceptionally low
quiescent current of 1.0 mA/amplifier typical (1.5 mA maximum).
The AD8038 single amplifier in the 8-lead SOIC package has a
disable feature. Despite being low power and low cost, the amplifier
provides excellent overall performance. Additionally, it offers a
high slew rate of 425 V/μs and a low input offset voltage of 3 mV
maximum.
The Analog Devices, Inc., proprietary XFCB process allows low
noise operation (8 nV/√Hz and 600 fA/√Hz) at extremely low
quiescent currents. Given a wide supply voltage range (3 V to 12 V),
wide bandwidth, and small packaging, the AD8038 and AD8039
amplifiers are designed to work in a variety of applications
where power and space are at a premium.
The AD8038 and AD8039 amplifiers have a wide input common-
mode range of 1 V from either rail and swing to within 1 V of each
rail on the output. These amplifiers are optimized for driving
capacitive loads up to 15 pF. If driving larger capacitive loads, a small
series resistor is needed to avoid excessive peaking or overshoot.
The AD8039 amplifier is available in a 8-lead SOT-23 package,
and the single AD8038 is available in both an 8-lead SOIC and a
5-lead SC70 package. These amplifiers are rated to work over
the industrial temperature range of 40°C to +85°C.
–6
1000
0.1
1
10
100
–3
0
3
6
9
12
15
18
21
24
FREQUENCY (MHz)
GA
IN
(
d
B
)
G = +5
G = +2
G = +1
G = +10
0
29
51
-0
04
Figure 4. Small Signal Frequency Response for Various Gains,
VOUT = 500 mV p-p, VS = ±5 V