AD846BN Analog Devices, AD846BN Datasheet

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AD846BN

Manufacturer Part Number
AD846BN
Description
450 V/us, Precision, Current-Feedback Op Amp
Manufacturer
Analog Devices
Datasheet
1.AD846BN.pdf (12 pages)

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a
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.
√Hz
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%
2. For closed-loop gains of –1 to –100, the high speed perfor-
3. The AD846 is well suited to line driver and video buffer
for gains of –1 to –10, with a 450 V/µs slew rate, while
consuming only 5 mA of supply current.
mance of the AD846 is achieved without sacrificing full 12-bit
dc precision.
applications where the properties of low distortion and high
slew rate are required.
Current-Feedback Op Amp
Plastic Mini-DIP (N) Package
CONNECTION DIAGRAMS
–INPUT
+INPUT
–V
Cerdip (Q) Package
450 V/ s, Precision,
NC
NC
NC
NC
NC
SOIC (R) Package
S
NC = NO CONNECT
1
2
3
4
5
6
7
8
(Not to Scale)
TOP VIEW
AD846
and
–
+
16
15
14
13
12
11
10
9
NC
NC
+V
NC
OUTPUT
COMPENSATION
NC
NC
S
AD846

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AD846BN Summary of contents

Page 1

... 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 ...

Page 2

AD846–SPECIFICATIONS Model Conditions 1 INPUT OFFSET VOLTAGE Initial T –T MIN MAX vs. Temperature vs. Supply (PSRR) 5 V–18 V Initial T –T MIN MAX = ± vs. Common Mode (CMRR Initial T –T MIN MAX ...

Page 3

... MAX 72 = +25° – +25° Model AD846AN AD846BN | – AD846AQ AD846BQ AD846SQ AD846SQ/883B 5962-8964601PA AD846AR-16 AD846AR-16-REEL NOTES 1 “A” and “S” grade chips are also available Plastic DIP Package Cerdip Package SOIC Package does not exceed J AD846B ...

Page 4

AD846 – Typical Characteristics ...

Page 5

AD846 ...

Page 6

AD846 – Typical Characteristics , Inverting Gain of 1 ...

Page 7

Typical Characteristics, Inverting Gain of 10 – AD846 ...

Page 8

AD846 POWER SUPPLY CONSIDERATIONS The power supply connections to the AD846 must maintain a low impedance to ground over a bandwidth of 40 MHz or more. This is especially important when driving a significant resistive or capacitive load, since all ...

Page 9

A more detailed examination of the closed-loop transfer func- tion of the AD846 results in the following equation:   Closed-Loop Gain G(   COMP   Compare this to the equation for a conventional op ...

Page 10

AD846 Where: is the external resistance placed in series with the non inverting input R is the feedback resistor F is the source resistor the noise current in the inverting input the ...

Page 11

This compensation node may also be used as an additional output terminal as in the precision transconductance amplifier application of Figure 46. The AD846 can be used in either the inverting transconduc- tance mode as shown in Figure 46, or ...

Page 12

AD846 SEATING PLANE SEATING PLANE 0.0118 (0.30) 0.0040 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic Mini-DIP (N) Package 8 5 0.31 0.25 (7.87) (6.35 0.39 (9.91) MAX 0.035 0.01 (0.89 0.25) 0.165 0.01 (4.19 0.25) ...

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