a
Wideband Voltage
Feedback Amplifier
AD9623*
FEATURES
270 MHz Small Signal Bandwidth
190 MHz Large Signal BW (4 V p-p)
High Slew Rate: 2100 V/ms
Low Distortion: –64 dB @ 20 MHz
Fast Settling: 15 ns to 0.01%
2.6 nV/√Hz Spectral Noise Density
63 V Supply Operation
CONNECTION DIAGRAM
OBS
APPLICATIONS
ADC Input Driver
Differential Amplifiers
IF/RF Amplifiers
Pulse Amplifiers
Professional Video
DAC Current-to-Voltage
Baseband and Video Communications
Active Filters/lntegrators/Log Amps
GENERAL DESCRIPTION
NC #
1
8
NC #
–INPUT
2
7
+VS
+INPUT
3
6
OUTPUT
–VS
4
5
NC
AD9623
# OPTIONAL CAPACITOR CB CONNECTED HERE
DECREASES SETTLING TIME (SEE TEXT).
OLE
The AD9623 is one of a family of very high speed and wide
bandwidth amplifiers utilizing a voltage feedback architecture.
These amplifiers define a new level of performance for voltage
feedback amplifiers, especially in the categories of large signal
bandwidth, slew rate, settling, low distortion, and low noise.
Proprietary design architectures have resulted in an amplifier
family that combines the most attractive attributes of both current feedback and voltage feedback amplifiers. The AD9623
exhibits extraordinarily accurate and fast pulse response characteristics (8 ns settling to 0.1%) as well as extremely wide small
and large signal bandwidth previously found only in current
feedback amplifiers. When combined with balanced high impedance inputs and low input noise current more common to voltage feedback architectures, the AD9623 offers performance not
previously available in a monolithic operational amplifier.
*Protected by U.S. Patent 5,150,074 and others pending.
TE
Other members of the AD962X amplifier family are the
AD9621 (G = +1), AD9622 (G = +2), and the AD9624
(G = +6). A separate data sheet is available from Analog
Devices for each model. Each generic device has been designed
for a different minimum stable gain setting, allowing users flexibility in optimizing system performance. Dynamic performance
specifications such as slew rate, settling time, and distortion vary
from model to model. The table below summarizes key performance attributes for the AD962X family and can be used as a
selection guide.
The AD9623 is offered in industrial and military temperature
ranges. Industrial versions are available in plastic DIP, SOIC,
and cerdip; MIL versions are packaged in cerdips.
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
6.
Wide Large Signal Bandwidth
High Slew Rate
Fast Settling
Low Distortion
Output Short-Circuit Protected
Low Intermodulation Distortion of High Frequencies
Parameter
AD9621
AD9622
AD9623
AD9624
Units
Minimum Stable Gain
Harmonic Distortion (20 MHz)
Large Signal Bandwidth (4 V p-p)
SSBW (0.5 V p-p)
Slew Rate
Rise/Fall Time (0.5 V Step)
Settling Time (to 0.1%/0.01%)
Input Noise (0.1 MHz – 200 MHz)
+1
–52
130
350
1200
2.4
7/11
80
+2
–66
160
220
1500
1.7
8/14
49
+4
–64
190
270
2100
1.6
8/14
36
+6
–66
200
300
2200
1.5
8/14
32
V/V
dB
MHz
MHz
V/µs
ns
ns
µV rms
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
AD9623–SPECIFICATIONS
DC ELECTRICAL CHARACTERISTICS (6V = 65 V, R
S
Parameter
Conditions
LOAD
= 100 V; AV = +4; RF = 270 V, unless otherwise noted)
Temp
Test
Level
AD9623AN/AQ/AR
Min
Typ Max
+25°C
Full
+25°C
Full
Full
+25°C
Full
Full
+25°C
+25°C
Full
+25°C
+25°C
Full
Full
+25°C
I
VI
I
VI
V
I
VI
V
V
V
VI
I
V
VI
VI
V
–8
–10
Min
AD9623SQ
Typ Max
Units
1
DC SPECIFICATIONS
Input Offset Voltage
Input Bias Current
Bias Current TC
Input Offset Current
Offset Current TC
Input Resistance
Input Capacitance
Common-Mode Range
Common-Mode Rejection Ratio
Open-Loop Gain
Output Voltage Range
Output Current
Output Resistance
∆VCM = 1 V
VOUT = ± 2 V p-p
FREQUENCY DOMAIN
Bandwidth (–3 dB)
Small Signal
Large Signal
Amplitude of Peaking
Amplitude of Roll-off
Phase Nonlinearity
2nd Harmonic Distortion
3rd Harmonic Distortion
Common-Mode Rejection Ratio
Spectral Input Noise Voltage
Spectral Input Noise Current
Average Equivalent Integrated
Input Noise Voltage
VOUT = 0.4 V p-p
VOUT = 4 V p-p
Full Spectrum
DC to 100 MHz
0.3 to 100 MHz
2 V p-p; 20 MHz
2 V p-p; 20 MHz
@ 20 MHz
1 to 200 MHz
1 to 200 MHz
Full
+25°C
Full
Full
+25°C
Full
Full
+25°C
+25°C
+25°C
II
V
II
II
V
II
II
V
V
V
0.1 to 200 MHz
+25°C
V
VOUT = 5 V Step
VOUT = 0.5 V Step
VOUT = 5 V Step
VOUT = 2 V Step
Full
+25°C
Full
Full
IV
V
VI
IV
VOUT = 2 V Step
VOUT = 2 V Step
VOUT = 4 V Step
VOUT = 4 V Step
23 to ± 2 mV
RL = 150 Ω
RL = 150 Ω
+25°C
Full
+25°C
+25°C
+25°C
+25°C
+25°C
V
IV
V
V
V
V
V
Full
IV
Full
Full
+25°C
VI
VI
I
OBS
TIME DOMAIN
Slew Rate
Rise/Fall Time
Overshoot
Settling Time
To 0.1%
To 0.01%
To 0.1%2
To 0.01%2
Overdrive Recovery
Differential Gain (4.3 MHz)
Differential Phase (4.3 MHz)
±2
6
–2
–3
± 3.0
52
± 3.0
60
+8
+10
12
16
30
± 0.3 +2
+3
2.0
600
1.2
± 3.4
63
69
± 3.4
70
0.3
–8
–10
6
–2
–3
± 3.0
52
± 3.0
60
OLE
POWER SUPPLY REQUIREMENTS1
Supply Voltage (± VS)
Quiescent Current
+IS
+VS = +5 V
–IS
–VS = –5 V
Power Supply Rejection Ratio
∆VS = 1 V
190
270
190
0.1
0
1.0
–64
–72
+21
2.6
2.5
1.2
0.7
–56
–65
2100
1.6
2.4
3.1
3
15
5.0
5.5
29
29
60
23
23
71
30
± 0.3 +2
+3
2.0
600
1.2
± 3.4
63
69
± 3.4
70
0.3
mV
mV
µA
µA
nA/°C
µA
µA
nA/°C
kΩ
pF
V
dB
dB
V
mA
Ω
270
190
0.1
0
1.0
–64
–72
+21
2.6
2.5
1.2
0.7
–56
–65
MHz
MHz
dB
dB
Degree
dBc
dBc
dB
nV/√Hz
pA/√Hz
36
µV rms
2100
1.6
2.4
3.1
3
15
V/µs
ns
ns
%
8
15
20
9
17
150
0.01
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