REV. C
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a
AD846
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
450 V/s, Precision,
Current-Feedback Op Amp
CONNECTION DIAGRAMS
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
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.
Plastic Mini-DIP (N) Package
and
Cerdip (Q) Package
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.
SOIC (R) Package
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
NC = NO CONNECT
NC
NC
–INPUT
NC
+INPUT
NC
–V
S
NC
NC
NC
+V
S
NC
OUTPUT
COMPENSATION
NC
NC
TOP VIEW
(Not to Scale)
AD846
–
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