Low Power, 350 MHz
Voltage Feedback Amplifiers
AD8038/AD8039
FEATURES
FUNCTIONAL BLOCK DIAGRAM
AD8038
Low power: 1 mA supply current/amp
High speed
350 MHz, −3 dB bandwidth (G = +1)
425 V/μs slew rate
NC
–IN
+IN
1
2
3
4
8
7
6
5
DISABLE
+V
S
V
OUT
–V
NC
S
NC = NO CONNECT
Low cost
Figure 1. 8-lead SOIC (R)
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
AD8038
V
1
2
3
5
+V
S
OUT
–V
S
+IN
4
–IN
−65 dB SFDR @ 5 MHz
Figure 2. 5-Lead SC70 (KS)
Wide supply range: 3 V to 12 V
Small packaging: 8-lead SOT-23, 5-lead SC70, and 8-lead SOIC
AD8039
V
1
2
3
4
8
7
6
5
+V
OUT1
–IN1
S
APPLICATIONS
V
OUT2
Battery-powered instrumentation
Filters
+IN1
–IN2
+IN2
–V
S
A/D drivers
Level shifting
Buffering
NC = NO CONNECT
Figure 3. 8-Lead SOIC (R) and 8-Lead SOT-23 (RJ)
Photo multipliers
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 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.
24
G = +10
21
18
15
12
G = +5
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.
9
6
3
G = +2
G = +1
0
–3
–6
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.
0.1
1
10
100
1000
FREQUENCY (MHz)
Figure 4. Small Signal Frequency Response for Various Gains,
OUT = 500 mV p-p, VS = 5 V
V
Rev. G
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