a
FEATURES
AC PERFORMANCE
Unity Gain Bandwidth: 34 MHz
Fast Settling: 135 ns to 0.01%
Slew Rate: 250 V/ s
Stable at Gains of 1 or Greater
Full Power Bandwidth: 3.9 MHz
DC PERFORMANCE
Input Offset Voltage: 1 mV max (AD843K/B}
Input Bias Current: 0.6 nA typ
Input Voltage Noise: 19 nV/√Hz
Open Loop Gain: 30 V/mV into a 500 Load
Output Current: 50 mA min
Supply Current: 13 mA max
Available in 8-Pin Plastic Mini-DIP & Cerdip, 16-Pin SOIC,
20-Pin LCC and 12-Pin Hermetic Metal Can Packages
Available in Tape and Reel in Accordance with
EIA-481A Standard
Chips and MIL-STD-883B Parts Also Available
APPLICATIONS
High Speed Sample-and-Hold Amplifiers
High Bandwidth Active Filters
High Speed Integrators
High Frequency Signal Conditioning
PRODUCT DESCRIPTION
34 MHz, CBFET
Fast Settling Op Amp
AD843
CONNECTION DIAGRAMS
16-Pin SOIC (R-16) Package
Plastic (N-8) and
Cerdip (Q-8) Package
TO-8 (H-12A) Package
LCC (E-20A) Package
The AD843 is a fast settling, 34 MHz, CBFET input op amp.
The AD843 combines the low (0.6 nA) input bias currents
characteristic of a FET input amplifier while still providing a
34 MHz bandwidth and a 135 ns settling time (to within 0.01%
of final value for a 10 volt step). The AD843 is a member of the
Analog Devices’ family of wide bandwidth operational amplifi-
ers. These devices are fabricated using Analog Devices’ junction
isolated complementary bipolar (CB) process. This process per-
mits a combination of dc precision and wideband ac perform-
ance previously unobtainable in a monolithic op amp.
The 250 V/µs slew rate and 0.6 nA input bias current of the
AD843 ensure excellent performance in high speed sample-and-
hold applications and in high speed integrators. This amplifier is
also ideally suited for high bandwidth active filters and high fre-
quency signal conditioning circuits.
Unlike many high frequency amplifiers, the AD843 requires no
external compensation and it remains stable over its full operat-
ing temperature range. It is available in five performance grades:
the AD843J and AD843K are rated over the commercial
temperature range of 0°C to +70°C. The AD843A and AD843B
are rated over the industrial temperature range of –40°C to +85°C.
The AD843S is rated over the military temperature range of –55°C
to +125°C and is available processed to MIL-STD-883B, Rev. C.
REV. D
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 AD843 is offered in either 8-pin plastic DIP or hermetic
cerdip packages, in 16-pin SOIC, 20-Pin LCC, or in a 12-pin
metal can. Chips are also available.
PRODUCT HIGHLIGHTS
1. The high slew rate, fast settling time and low input bias cur-
rent of the AD843 make it the ideal amplifier for 12-bit D/A
and A/D buffers, for high speed sample-and-hold amplifiers
and for high speed integrator circuits. The AD843 can re-
place many FET input hybrid amplifiers such as the
LH0032, LH4104 and OPA600.
2. Fully differential inputs provide outstanding performance in
all standard high frequency op amp applications such as sig-
nal conditioning and active filters.
3. Laser wafer trimming reduces the input offset voltage to
1 mV max (AD843K and AD843B).
4. Although external offset nulling is unnecessary in many ap-
plications, offset null pins are provided.
5. The AD843 does not require external compensation at
closed loop gains of 1 or greater.
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
AD843
NOTES
1
Standard Military Drawings Available: 5962-9098001M2A (SE/883B), 5962-9098001MXA (SH/883B), 5962-9098001MPA (SQ/883B).
2
Specifications are guaranteed after 5 minutes at T
A
= +25°C.
3
Full power bandwidth = Slew Rate/2
πV
peak.
4
All “S” grade T
MIN
-T
MAX
specifications are tested with automatic test equipment at T
A
= –55°C and T
A
= +125°C.
Specifications subject to change without notice.
Specifications in
boldface
are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and
max specifications are guaranteed although only those shown in
boldface
are tested on all production units.
ABSOLUTE MAXIMUM RATINGS
1
METALIZATION PHOTOGRAPH
Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .± 18 V
Internal Power Dissipation
2
Plastic Package . . . . . . . . . . . . . . . . . . . . . . . . . . 1.50 Watts
Cerdip Package . . . . . . . . . . . . . . . . . . . . . . . . . 1.35 Watts
12-Pin Header Package . . . . . . . . . . . . . . . . . . . 1.80 Watts
16-Pin SOIC Package . . . . . . . . . . . . . . . . . . . . 1.50 Watts
20-Pin LCC Package . . . . . . . . . . . . . . . . . . . . . . 1.00 Watt
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
V
S
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . +V
S
and –V
S
Storage Temperature Range (N, R) . . . . . . . –65°C to +125°C
Storage Temperature Range (Q, H, E) . . . . –65°C to +150°C
Operating Temperature Range
AD843J/R . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
AD843A/B . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
AD843S . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 V
NOTES
1
Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to 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
8-Pin Plastic Package:
θ
JA
= 100°C/Watt
8-Pin Cerdip Package:
θ
JA
= 110°C/Watt
12-Pin Header Package:
θ
JA
= 80°C/Watt
16-Pin SOIC Package:
θ
JA
= 100°C/Watt
20-Pin LCC Package:
θ
JA
= 150°C/Watt
REV. D
–3–
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