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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
450 V/ s, Precision,
Current-Feedback Op Amp
AD846
CONNECTION DIAGRAM
Plastic Mini-DIP (N) Package
and
Cerdip (Q) Package
OBS
PRODUCT DESCRIPTION
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
Hermetic Metal Can Packages
MIL-STD-883B Parts Available
OLE
TE
PRODUCT HIGHLIGHTS
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 performance makes
the AD846 an excellent choice for buffering precision high
speed DACs and flash ADCs.
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
military temperature range of –55°C to +125°C and is available
processed to MIL-STD-883B, Rev C.
Extended reliability PLUS screening is available specified over
the commercial temperature range. PLUS screening includes
168 hour burn-in as well as other environmental and physical
tests. The AD846 is available in two types of 8-pin package:
plastic mini-DIP and hermetic cerdip. “A” and “S” grade chips
are also available.
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 sig-
nificant performance benefits. Employing Analog Devices’ junc-
tion 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 constant
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.
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 con-
suming 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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
AD846–SPECIFICATIONS
(@ +25 C and
Model
INPUT OFFSET VOLTAGE
1
Initial
T
MIN
–T
MAX
vs. Temperature
vs. Supply (PSRR)
Initial
T
MIN
–T
MAX
vs. Common Mode (CMRR)
Initial
T
MIN
–T
MAX
INPUT BIAS CURRENT
3
–Input Bias Current
Initial
T
MIN
–T
MAX
vs. Temperature
vs. Supply
Initial
T
MIN
–T
MAX
vs. Common Mode
Initial
T
MIN
–T
MAX
+Input Bias Current
Initial
T
MIN
–T
MAX
vs. Temperature
vs. Supply
Initial
T
MIN
–T
MAX
vs. Common Mode
Initial
T
MIN
–T
MAX
INPUT CHARACTERISTICS
Input Resistance
–Input
+Input
Input Capacitance
–Input
+Input
INPUT VOLTAGE RANGE
Common Mode
INPUT VOLTAGE NOISE
Input Current Noise
–Input
+Input
OPEN LOOP
TRANSRESISTANCE
Conditions
Min
15 V dc, unless otherwise noted)
Min
AD846B
Typ Max
25
50
0.8
120
116
120
116
125
120
125
120
75
125
3.5
110
94
110
94
Min
AD846S
Typ Max
25
100
1
125
116
125
116
200
350
5.5
Units
µV
µV
µV/°C
dB
dB
dB
dB
AD846A
Typ Max
25
50
0.8
200
350
5
5 V–18 V
2
V
CM
=
±
10 V
110
110
110
110
125
120
125
120
OBS
5 V–18 V
2
V
CM
=
±
10 V
5 V–18 V
2
V
CM
=
±
10 V
F = 1 kHz
1 kHz
1 kHz
V
OUT
=
±
10 V
R
LOAD
= 500
Ω
T
MIN
–T
MAX
R
LOAD
= 500
Ω
Short Circuit
Open Loop
OUTPUT CHARACTERISTICS
Voltage
Current
Output Resistance
FREQUENCY RESPONSE
Small Signal Bandwidth
(–3 dB)
Full Power Bandwidth
4
Rise Time
Overshoot
Slew Rate
Settling Time
10 V Step, A
V
= –1
TOTAL HARMONIC
DISTORTION
5
150
450
6
9
11
5
5
450
1200
20
15
20
10
15
100
400
6
9
11
3
3
250
750
17
10
15
5
7
150
450
1000
1500
9
20
9
11
5
5
15
25
10
20
nA
nA
nA/°C
nA/V
nA/V
nA/V
nA/V
OLE
TE
3
4
15
5
5
15
20
80
15
20
15
15
3
4
15
5
5
5
7
45
10
15
10
10
3
5
15
5
5
5
5
15
20
80
15
20
15
20
µA
µA
nA/°C
nA/V
nA/V
nA/V
nA/V
5
5
3
3
50
10
2
2
50
10
2
2
50
10
2
2
Ω
kΩ
pF
pF
±
10
2
20
6
±
10
2
20
6
±
10
2
20
6
V
nV/√Hz
pA/√Hz
pA/√Hz
100
50
10
65
16
80
31
15
6.8
110
20
450
80
110
0.0005
200
150
75
10
65
16
80
31
15
6.8
10
20
450
80
110
0.0005
200
100
50
10
65
16
80
31
15
6.8
10
20
450
80
110
0.0005
200
MΩ
MΩ
V
mA
Ω
MHz
MHz
MHz
MHz
ns
%
V/µs
ns
ns
%
A
V
= –1 R
F
= 1k
A
V
= –10 R
F
= 875
Ω
A
V
= –30 R
F
= 875
Ω
V
OUT
= 20 V p-p
R
I
= 500
Ω
A
V
= –1
A
V
= –1
A
V
= –1
to 0.1%
to 0.01%
F = 100 kHz
–2–
REV. B
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
OBS
ABSOLUTE MAXIMUM RATINGS
1
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.
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
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
OLE
TE
ORDERING GUIDE
Model
1
Temperature Range
Package
Option
2
N-8
N-8
Q-8
Q-8
Q-8
Q-8
Q-8
AD846AN
AD846BN
AD846AQ
AD846BQ
AD846SQ
AD846SQ/883B
5962-8964601PA
–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
NOTES
1
“A” and “S” grade chips are also available.
2
N = Plastic DIP Package; Q = Cerdip Package.
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
Consult factory for latest dimensions.
NOTES
1
Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent 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.
REV. B
–3–
AD846–Typical Characteristics
OBS
Figure 1. Input Voltage Swing
vs. Supply
Figure 4. Quiescent Supply Current
vs. Temperature
Figure 2. Output Voltage Swing
vs. Supply
Figure 3. Quiescent Current vs.
Supply Voltage
OLE
TE
Figure 6. Large Signal Frequency
Response
Figure 9. Negative Input Bias Current
vs. Common-Mode Voltage
Figure 5. Output Voltage Swing vs.
Resistive Load
Figure 7. Open-Loop Transimpedance
vs. Supply
Figure 8. Positive Input Bias Current
vs. Common-Mode Voltage
–4–
REV. B
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