a
FEATURES
AC PERFORMANCE
Small Signal Bandwidth: 80 MHz (A
V
= –1)
Slew Rate: 450 V/ s
Full Power Bandwidth: 6.8 MHz at 20 V p-p,
R
L
= 500
Fast Settling: for 10 V Step: 110 ns to 0.01%,
80 ns to 0.1%
Differential Gain: <0.01% @ 4.4 MHz
Differential Phase: <0.028 @ 4.4 MHz
Total Harmonic Distortion (THD): 0.0005% @ 100 kHz
Open-Loop Transimpedance: 200 M
Input Voltage Noise: 2 nV/√Hz
DC PERFORMANCE
Input Offset Voltage: 75 V max (B Grade)
Input Offset Drift: 3.5 V/ C max (B Grade)
Quiescent Supply Current: 6.5 mA max
APPLICATIONS
High Speed DAC Buffers
Multiflash ADC Error Amplifiers
Flash ADC Buffers
Coaxial Cable Drivers
High Performance Audio Circuitry
Available in Plastic Mini-DIP, Hermetic Cerdip, and
Plastic SOIC (A) Package
MIL-STD-883B Part Available
PRODUCT DESCRIPTION
450 V/ s, Precision,
Current-Feedback Op Amp
AD846
CONNECTION DIAGRAMS
Plastic Mini-DIP (N) Package
and
Cerdip (Q) Package
SOIC (R) Package
NC
1
NC
2
–INPUT
3
NC
4
+INPUT
5
NC
6
–
+
16
NC
15
NC
14
+V
S
13
NC
12
OUTPUT
AD846
11
COMPENSATION
TOP VIEW
–V
S 7
(Not to Scale)
10
NC
NC
8
9
NC
NC = NO CONNECT
The AD846 is a monolithic, very high speed operational ampli-
fier offering high performance. Although technically classed as a
current-feedback or transimpedance amplifier, it may be used
in much the same way as traditional op amps while providing
significant performance benefits. Employing Analog Devices’
junction isolated complementary bipolar (CB) process, the AD846
achieves true “12-bit” (0.01%) precision on critical ac and dc
parameters, a level of performance unmatched by amplifiers
fabricated using either the dielectrically isolated (DI) or other
bipolar processes.
The AD846 offers significant advantages over conventional
high speed operational amplifiers. It maintains a nearly con-
stant bandwidth and settling time to 0.01% over a wide range
of closed-loop gains. This makes the AD846 ideal for amplifying
the residue in multiple-pass analog-to-digital converters.
Other advantages include: low input errors and high open-loop
transresistance (200 MΩ) into a 500
Ω
load, ensuring true
12-bit dc accuracy for closed-loop gains from –1 to gains
greater than –100. This combination of ac and dc perfor-
mance makes the AD846 an excellent choice for buffering
precision high speed DACs and flash ADCs.
REV. C
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.
The AD846 is available in three performance grades. The AD846A
and AD846B are rated over the industrial temperature range
of –40°C to +85°C. The AD846S is rated over the full mili-
tary temperature range of –55°C to +125°C and is available
processed to MIL-STD-883B, Rev C.
The AD846 is available in two types of 8-lead packages: plastic
mini-DIP and hermetic cerdip. The AD846AR-16 is available in
the 16-lead SOIC package. “A” and “S” grade chips are also
available.
PRODUCT HIGHLIGHTS
1. The AD846 achieves settling times of 110 ns to 0.01%
for gains of –1 to –10, with a 450 V/µs slew rate, while
consuming only 5 mA of supply current.
2. For closed-loop gains of –1 to –100, the high speed perfor-
mance of the AD846 is achieved without sacrificing full 12-bit
dc precision.
3. The AD846 is well suited to line driver and video buffer
applications where the properties of low distortion and high
slew rate are required.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
AD846
Model
DIFFERENTIAL GAIN
DIFFERENTIAL PHASE
POWER SUPPLY
Rated Performance
Operating Range
Quiescent Current
TRANSISTOR COUNT
Conditions
F = 4.4 MHz, R
L
= 100
Ω
F = 4.4 MHz, R
L
= 100
Ω
Min
AD846A
Typ Max
0.01
0.028
±
15
5
72
18
6.5
Min
AD846B
Typ Max
0.01
0.028
±
15
5
72
18
6.5
5
5
72
7
Min
AD846S
Typ Max
0.01
0.028
±
15
18
Units
%
Degrees
V
V
mA
±
5
T
MIN
–T
MAX
±
5
NOTES
1
Input Offset Voltage Specifications are guaranteed after 5 minutes at T
A
= +25°C.
2
Test Conditions: +V
S
= 15 V, –V
S
= 5 V to 18 V and +V
S
= 5 V to 18 V, –V
S
= 15 V.
3
Bias Current Specifications are guaranteed maximum after 5 minutes at T
A
= +25°C.
4
FPBW = Slew Rate/2
π
V
PEAK
.
5
Total Harmonic Distortion.
All min and max specifications are guaranteed. Specifications shown in
boldface
are tested on all production units at final electrical test. Results from those tests are
used to calculate outgoing quality levels.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS
1
ORDERING GUIDE
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Internal Power Dissipation
2
Plastic Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 W
Cerdip Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 W
Common-Mode Input Voltage, Max Safe . . . . . . . |V
S
| – 3 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . .
±
1 V
Continuous Input Current
Inverting or Noninverting . . . . . . . . . . . . . . . . . . . . 2.0 mA
Storage Temperature Range (Q) . . . . . . . . . –65°C to +150°C
Storage Temperature Range (N) . . . . . . . . . –65°C to +125°C
Storage Temperature Range (R) . . . . . . . . . –65°C to +125°C
Operating Temperature Range
AD846A/B . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
AD846S . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . +300°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3500 V
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; the functional operation of
the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2
Maximum internal power dissipation is specified so that T
J
does not exceed
+175°C at an ambient temperature of +25°C, derate cerdip (Q) package at
8.7 mW/°C and plastic (N) package at 10 mW/°C.
Plastic Package:
θ
JA
= 100°C/Watt,
θ
JC
= 33°C/W.
Cerdip Package:
θ
JA
= 110°C/Watt,
θ
JC
= 30°C/W.
SOIC Package:
θ
JA
= 100°C/Watt,
θ
JC
= 33°C/W.
Model
1
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–40°C to +85°C
–40°C to +85°C
Package
Option
2
N-8
N-8
Q-8
Q-8
Q-8
Q-8
Q-8
R-16
R-16
AD846AN
AD846BN
AD846AQ
AD846BQ
AD846SQ
AD846SQ/883B
5962-8964601PA
AD846AR-16
AD846AR-16-REEL
NOTES
1
“A” and “S” grade chips are also available.
2
N = Plastic DIP Package; Q = Cerdip Package, R = SOIC Package
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
Consult factory for latest dimensions.
REV. C
–3–
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
