Low Noise, 1 GHz
FastFET Op Amps
Data Sheet
ADA4817-1/ADA4817-2
FEATURES
CONNECTION DIAGRAMS
ADA4817-1
High speed
TOP VIEW
(Not to Scale)
−3 dB bandwidth (G = 1, RL = 100 Ω): 1050 MHz
Slew rate: 870 V/µs
0.1% settling time: 9 ns
Low input bias current: 2 pA
Low input capacitance
PD
FB
1
2
3
4
8
7
6
5
+V
S
OUT
NC
–IN
+IN
–V
S
Common-mode capacitance: 1.3 pF
Differential-mode capacitance: 0.1 pF
Low noise
NC = NO CONNECT
Figure 1. 8-Lead LFCSP (CP-8-2)
ADA4817-1
4 nV/√Hz @ 100 kHz
2.5 fA/√Hz @ 100 kHz
TOP VIEW
(Not to Scale)
Low distortion
FB
–IN
+IN
1
2
3
4
8
7
6
5
PD
+V
−90 dBc @ 10 MHz (G = 1, RL = 1 kΩ)
Offset voltage: 2 mV maximum
High output current: 40 mA
Supply current per amplifier: 19 mA
Power-down supply current per amplifier: 1.5 mA
S
OUT
NC
–V
S
NC = NO CONNECT
Figure 2. 8-Lead SOIC (RD-8-1)
ADA4817-2
APPLICATIONS
TOP VIEW
(Not to Scale)
Photodiode amplifiers
Data acquisition front ends
Instrumentation
Filters
ADC drivers
CCD output buffers
12 –V
11
–IN1 1
S1
2
3
4
+IN1
NC
NC
10
9
+IN2
–IN2
–V
S2
NC = NO CONNECT
Figure 3. 16-Lead LFCSP (CP-16-20)
GENERAL DESCRIPTION
With a wide supply voltage range from 5 V to 10 V and the
ability to operate on either single or dual supplies, the
ADA4817-1/ ADA4817-2 are designed to work in a variety of
applications including active filtering and ADC driving.
The ADA4817-1 (single) and ADA4817-2 (dual) FastFET™
amplifiers are unity-gain stable, ultrahigh speed voltage
feedback amplifiers with FET inputs. These amplifiers were
developed with the Analog Devices, Inc., proprietary eXtra Fast
Complementary Bipolar (XFCB) process, which allows the
amplifiers to achieve ultralow noise (4 nV/√Hz; 2.5 fA/√Hz)
as well as very high input impedances.
The ADA4817-1 is available in a 3 mm × 3 mm, 8-lead LFCSP and
8-lead SOIC, and the ADA4817-2 is available in a 4 mm × 4 mm,
16-lead LFCSP. These packages feature a low distortion pinout
that improves second harmonic distortion and simplifies circuit
board layout. They also feature an exposed paddle that provides a
low thermal resistance path to the printed circuit board (PCB).
This enables more efficient heat transfer and increases reliability.
These products are rated to work over the extended industrial
temperature range (−40°C to +105°C).
With 1.3 pF of input capacitance, low noise (4 nV/√Hz), low
offset voltage (2 mV maximum), and 1050 MHz −3 dB band-
width, the ADA4817-1/ADA4871-2 are ideal for data acquisition
front ends as well as wideband transimpedance applications,
such as photodiode preamps.
Rev. B
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Tel: 781.329.4700 ©2008–2013 Analog Devices, Inc. All rights reserved.
Technical Support
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