REV. B
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.
a
AD848/AD849
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
High Speed, Low Power
Monolithic Op Amp
FEATURES
725 MHz Gain Bandwidth AD849
175 MHz Gain Bandwidth AD848
4.8 mA Supply Current
300 V/ s Slew Rate
80 ns Settling Time to 0.1% for a 10 V Step AD849
Differential Gain: AD848 = 0.07%, AD849 = 0.08%
Differential Phase: AD848 = 0.08 , AD849 = 0.04
Drives Capacitive Loads
DC PERFORMANCE
3 nV/
Hz Input Voltage Noise AD849
85 V/mV Open Loop Gain into a 1 k Load AD849
1 mV max Input Offset Voltage
Performance Specified for 5 V and 15 V Operation
Available in Plastic, Hermetic Cerdip and Small Outline
Packages. Chips and MIL-STD-883B Parts Available.
Available in Tape and Reel in Accordance with
EIA-481A Standard
APPLICATIONS
Cable Drivers
8- and 10-Bit Data Acquisition Systems
Video and R
F
Amplification
Signal Generators
PRODUCT DESCRIPTION
The AD848 and AD849 are high speed, low power monolithic
operational amplifiers. The AD848 is internally compensated so
that it is stable for closed loop gains of 5 or greater. The AD849
is fully decompensated and is stable at gains greater than 24.
The AD848 and AD849 achieve their combination of fast ac
and good dc performance by utilizing Analog Devices' junction
isolated complementary bipolar (CB) process. This process
enables these op amps to achieve their high speed while only
requiring 4.8 mA of current from the power supplies.
The AD848 and AD849 are members of Analog Devices' family
of high speed op amps. This family includes, among others, the
AD847 which is unity gain stable, with a gain bandwidth of
50 MHz. For more demanding applications, the AD840,
AD841 and AD842 offer even greater precision and greater
output current drive.
The AD848 and AD849 have good dc performance. When
operating with
5 V supplies, they offer open loop gains of
13 V/mV (AD848 with a 500
load) and low input offset
voltage of 1 mV maximum. Common-mode rejection is a
minimum of 92 dB. Output voltage swing is
3 V even into
loads as low as 150
.
APPLICATIONS HIGHLIGHTS
1. The high slew rate and fast settling time of the AD848 and
AD849 make them ideal for video instrumentation circuitry,
low noise pre-amps and line drivers.
2. In order to meet the needs of both video and data acquisition
applications, the AD848 and AD849 are optimized and
tested for
5 V and
15 V power supply operation.
3. Both amplifiers offer full power bandwidth greater than
20 MHz (for 2 V p-p with
5 V supplies).
4. The AD848 and AD849 remain stable when driving any
capacitive load.
5. Laser wafer trimming reduces the input offset voltage to
1 mV maximum on all grades, thus eliminating the need for
external offset nulling in many applications.
6. The AD848 is an enhanced replacement for the LM6164
series and can function as a pin-for-pin replacement for
many high speed amplifiers such as the HA2520/2/5 and
EL2020 in applications where the gain is 5 or greater.
CONNECTION DIAGRAMS
Plastic (N),
Small Outline (R) and
Cerdip (Q) Packages
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
NC = NO CONNECT
NULL
NC
OUTPUT
+V
S
NULL
IN
+IN
V
S
AD848/49
20-Terminal LCC Pinout
NC = NO CONNECT
NC
NC
NC
OFFSET
NULL
NC
V+
NC
NC
NC
IN
NC
NC
+IN
NC
NC
NC
NC
V
14
18
16
17
15
19
20
3
1
2
7
8
4
6
5
13
12
9
11
10
TOP VIEW
(Not to Scale)
AD848SE/883B
OFFSET
NULL
OUTPUT
AD848/AD849
REV. B
4
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 V
Internal Power Dissipation
2
Plastic (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Watts
Small Outline (R) . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 Watts
Cerdip (Q) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Watts
LCC (E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 Watts
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . .
6 V
Storage Temperature Range (Q) . . . . . . . . 65
C to +150
C
(N, R) . . . . . . . . . . . . . . . . . . . . . . . . . . 65
C to +125
C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +175
C
Lead Temperature Range (Soldering 60 sec) . . . . . . . +300
C
NOTES
1
Stresses above those listed under "Absolute Maximum Ratings" may cause per-
manent damage to the device. This is a stress rating only, and functional opera-
tion of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2
LCC:
JA
= 150
C/Watt
Mini-DIP Package:
JA
= 110
C/Watt
Cerdip Package:
JA
= 110
C/Watt
Small Outline Package:
JA
= 155
C/Watt.
METALIZATION PHOTOGRAPH
Contact factory for latest dimensions. (AD848 and AD849 are identical
except for the part number in the upper right.)
Dimensions shown in inches and (mm).
ORDERING GUIDE
Gain
Min
Max
Bandwidth
Stable
Offset Voltage
Temperature
Package
Model
MHz
Gain
mV
Range C
Option
1
AD848JN
175
5
1
0 to +70
N-8
AD848JR
2
175
5
1
0 to +70
R-8
AD848JCHIPS
175
5
1
0 to +70
Die Form
AD848AQ
175
5
1
40 to +85
Q-8
AD848SQ
175
5
1
55 to +125
Q-8
AD848SQ/883B
175
5
1
55 to +125
Q-8
AD848SE/883B
175
5
1
55 to +125
E-20A
AD849JN
725
25
1
0 to +70
N-8
AD849JR
2
725
25
1
0 to +70
R-8
AD849AQ
725
25
0.75
40 to +85
Q-8
AD849SQ
725
25
0.75
55 to +125
Q-8
AD849SQ/883B
725
25
0.75
55 to +125
Q-8
AD847J/A/S
50
1
1
See AD847 Data Sheet
NOTES
1
E = LCC; N = Plastic DIP; Q = Cerdip; R = Small Outline IC (SOIC).
2
Plastic SOIC (R) available in tape and reel. AD848 available in S grade chips. AD849 available in J and S grade
chips.
AD848/AD849
REV. B
5
Figure 1. AD848 Inverting Amplifier Configuration
Figure 1a. AD848 Large Signal Pulse Response
Figure 1b. AD848 Small Signal Pulse Response
OFFSET NULLING
The input voltage of the AD848 and AD849 are very low for
high speed op amps, but if additional nulling is required, the
circuit shown in Figure 3 can be used.
For high performance circuits it is recommended that a resistor
(R
B
in Figures 1 and 2) be used to reduce bias current errors by
matching the impedance at each input. The offset voltage error
caused by the input currents is decreased by more than an order
of magnitude.
Figure 2. AD849 Inverting Amplifier Configuration
Figure 2a. AD849 Large Signal Pulse Response
Figure 2b. AD849 Small Signal Pulse Response
Figure 3. Offset Nulling