Datasheet AD827SQ-883B, AD827SQ, AD827SE-883B, AD827SCHIPS, AD827JR-REEL Datasheet (Analog Devices)

High Speed, Low Power

a

FEATURES
HIGH SPEED

50 MHz Unity Gain Stable Operation
300 V/ms Slew Rate
120 ns Settling Time
Drives Unlimited Capacitive Loads

EXCELLENT VIDEO PERFORMANCE

0.04% Differential Gain @ 4.4 MHz

0.198 Differential Phase @ 4.4 MHz
GOOD DC PERFORMANCE

2 mV max Input Offset Voltage
15 mV/8C Input Offset Voltage Drift
Available in Tape and Reel in Accordance with

EIA-481A Standard

LOW POWER
Only 10 mA Total Supply Current for Both Amplifiers

65 V to 615 V Supplies

PRODUCT DESCRIPTION

The AD827 is a dual version of Analog Devices’ industry­standard AD847 op amp. Like the AD847, it provides high
speed, low power performance at low cost. The AD827 achieves
a 300 V/µs slew rate and 50 MHz unity-gain bandwidth while
consuming only 100 mW when operating from ± 5 volt power
supplies. Performance is specified for operation using ± 5 V to
±15 V power supplies.

The AD827 offers an open-loop gain of 3,500 V/V into 500 Ω
loads. It also features a low input voltage noise of 15 nV/√
and a low input offset voltage of 2 mV maximum. Common­mode rejection ratio is a minimum of 80 dB. Power supply
rejection ratio is maintained at better than 20 dB with input
frequencies as high as 1 MHz, thus minimizing noise
feedthrough from switching power supplies.

The AD827 is also ideal for use in demanding video applica­tions, driving coaxial cables with less than 0.04% differential
gain and 0.19° differential phase errors for 643 mV p-p into a
75 Ω reverse terminated cable.

The AD827 is also useful in multichannel, high speed data
conversion systems where its fast (120 ns to 0.1%) settling time
is of importance. In such applications, the AD827 serves as an
input buffer for 8-bit to 10-bit A/D converters and as an output
amplifier for high speed D/A converters.

Hz,

Dual Op Amp

AD827

CONNECTION DIAGRAMS

8-Pin Plastic (N) and Cerdip

(Q) Packages

20-Pin LCC (E) Package

APPLICATION HIGHLIGHTS

1. Performance is fully specified for operation using ±5 V to
±15 V supplies.

2. A 0.04% differential gain and 0.19° differential phase error at
the 4.4 MHz color subcarrier frequency, together with its low
cost, make it ideal for many video applications.

3. The AD827 can drive unlimited capacitive loads, while its
30 mA output current allows 50 Ω and 75 Ω reverse­terminated loads to be driven.

4. The AD827’s 50 MHz unity-gain bandwidth makes it an
ideal candidate for multistage active filters.

5. The AD827 is available in 8-pin plastic mini-DIP and cerdip,
20-pin LCC, and 16-pin SOIC packages. Chips and MIL­STD-883B processing are also available.

16-Pin Small Outline

(R) Package

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: [phone] Fax: [phone]

AD827–SPECIFICATIONS

(@ TA = +258C, unless otherwise noted)

AD827J AD827A/S

Model Conditions V

DC PERFORMANCE

Input Offset Voltage

1

T

to T

MIN

MAX

S

±5 V 0.5 2 0.3 2 mV

Min Typ Max Min Typ Max Units

3.5 4 mV

±15 V 4 4 mV

T

MIN

to T

MAX

66mV

Offset Voltage Drift ±5 V to ±15 V 15 15 µV/°C
Input Bias Current ±5 V to ±15 V 3.3 7 3.3 7 µA

T

MIN

to T

MAX

8.2 9.5 µA

Input Offset Current ±5 V to ±15 V 50 300 50 300 nA

T

MIN

to T

MAX

400 400 nA

Offset Current Drift ±5 V to ±15 V 0.5 0.5 nA/°C
Common-Mode Rejection Ratio V

= ±2.5 V ±5 V 7895 8095 dB

CM

V

= ±12 V ±15 V 7895 8095 dB

CM

T

MIN

to T

MAX

±5 V to ±15 V7575dB

Power Supply Rejection Ratio ±5 V to ±15 V7586 7586 dB

T

MIN

to T

MAX

72 72 dB

Open-Loop Gain

V

= ±2.5 V ±5 V

O

R

= 500 Ω 2 3.5 2 3.5 V/mV

LOAD

T

to T
R
V
R
T

MIN
LOAD
OUT
LOAD
MIN

MAX

= 150 Ω 1.6 1.6 V/mV

= ±10 V ±15 V

= 1 kΩ 3 5.5 3 5.5 V/mV

to T

MAX

1 1 V/mV

1.5 1.5 V/mV

MATCHING CHARACTERISTICS

Input Offset Voltage ±5 V 0.4 0.2 mV
Crosstalk f = 5 MHz ±5 V 85 85 dB

DYNAMIC PERFORMANCE

Unity-Gain Bandwidth ±5 V 35 35 MHz

Full Power Bandwidth

Slew Rate

3

2

Settling Time to 0.1% A

VO = 5 V p-p,

R

= 500 Ω±5 V 12.7 12.7 MHz

LOAD

V

= 20 V p-p,

O

R

= 1 kΩ±15 V 4.7 4.7 MHz

LOAD

R

= 500 Ω±5 V 200 200 V/µs

LOAD

R

= 1 kΩ±15 V 300 300 V/µs

LOAD

= –1

V

±15 V 50 50 MHz

–2.5 V to +2.5 V ±5 V 65 65 ns
–5 V to +5 V ±15 V 120 120 ns

Phase Margin C

= 10 pF ±15 V

LOAD

R

= 1 kΩ 50 50 Degrees

LOAD

Differential Gain Error f = 4.4 MHz ±15 V 0.04 0.04 %
Differential Phase Error f = 4.4 MHz ±15 V 0.19 0.19 Degrees
Input Voltage Noise f = 10 kHz ±15 V 15 15 nV/√
Input Current Noise f = 10 kHz ±15 V 1.5 1.5 pA/√
Input Common-Mode

Voltage Range ±5 V +4.3 +4.3 V

–3.4 –3.4 V

±15 V +14.3 +14.3 V

–13.4 –13.4 V

Output Voltage Swing R

= 500 Ω±5 V 3.0 3.6 3.0 3.6 ±V

LOAD

R

= 150 Ω±5 V 2.5 3.0 2.5 3.0 ±V

LOAD

R

= 1 kΩ±15 V 12 13.3 12 13.3 ±V

LOAD

R

= 500 Ω±15 V 10 12.2 10 12.2 ±V

LOAD

Short-Circuit Current Limit ±5 V to ±15 V 32 32 mA

INPUT CHARACTERISTICS

Input Resistance 300 300 kΩ
Input Capacitance 1.5 1.5 pF

Hz
Hz

–2–

REV. B

AD827

AD827J AD827A/S

Model Conditions V

S

OUTPUT RESISTANCE Open Loop 15 15 Ω
POWER SUPPLY

Operating Range ±4.5 ± 18 ±4.5 ±18 V
Quiescent Current ±5 V 1013 1013 mA

T

to T

MIN

MAX

±15 V 10.5 13.5 10.5 13.5 mA

T

to T

MIN

MAX

TRANSISTOR COUNT 92 92

NOTES

1

Offset voltage for the AD827 is guaranteed after power is applied and the device is fully warmed up. All other specifications are measured using high speed test equip­ment, approximately 1 second after power is applied.

2

Full Power Bandwidth = Slew Rate/2 π V

3

Gain = +1, rising edge.

All min and max specifications are guaranteed.
Specifications subject to change without notice.

PEAK

.

Min Typ Max Min Typ Max Units

16 16.5/17.5 mA

16.5 17/18 mA

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V

Internal Power Dissipation

2

1

Plastic (N) Package (Derate at 10 mW/°C) . . . . . . . . 1.5 W

Cerdip (Q) Package (Derate at 8.7 mW/°C) . . . . . . . . 1.3 W

Small Outline (R) Package (Derate at 10 mW/°C) . . . 1.5 W

LCC (E) Package (Derate at 6.7 mW/°C) . . . . . . . . . 1.0 W

Input Common Mode Voltage . . . . . . . . . . . . . . . . . . . . . .±V

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 6 V

Output Short Circuit Duration

3

. . . . . . . . . . . . . . . . Indefinite

S

Storage Temperature Range (N, R) . . . . . . . –65°C to +125°C

Storage Temperature Range (Q) . . . . . . . . . –65°C to +150°C

Operating Temperature Range

AD827J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C

AD827A . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C

AD827S . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C

Lead Temperature Range

(Soldering to 60 sec) . . . . . . . . . . . . . . . . . . . . . . . +300°C

NOTES

1

Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only, and functional
operation 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 ratings for extended periods may affect device reliability.

2

Maximum internal power dissipation is specified so that TJ does not exceed
+175°C at an ambient temperature of +25°C.

Thermal Characteristics:
Mini-DIP: θJA = 100°C/Watt; θ
Cerdip: θJA = 110°C/Watt; θ
16-Pin Small Outline Package: θJA = 100°C/Watt
20-Pin LCC: θJA = 150°C/Watt; θJC = 35°C/Watt

3

Indefinite short circuit duration is only permissible as long as the absolute
maximum power rating is not exceeded.

= 33°C/ Watt

JC

= 30°C/Watt

JC

ORDERING GUIDE

Temperature Package Package

Model Range Description Option

AD827JN 0°C to +70°C 8-Pin Plastic DIP N-8
AD827JR 0°C to +70°C 16-Pin Plastic SO R-16
AD827AQ –40° C to +85°C 8-Pin Cerdip Q-8
AD827SQ –55°C to +125°C 8-Pin Cerdip Q-8
AD827SQ/883B –55°C to +125°C 8-Pin Cerdip Q-8
5962-9211701MPA –55°C to +125°C 8-Pin Cerdip Q-8
AD827SE/883B –55°C to +125°C 20-Pin LCC E-20A
5962-9211701M2A –55°C to +125°C 20-Pin LCC E-20A
AD827JR-REEL 0°C to +70°C Tape & Reel
AD827JChips 0°C to +70°C Die
AD827SChips –55°C to +125°C Die

METALIZATION PHOTOGRAPH

Contact factory for latest dimensions.

Dimensions shown in inches and (mm).

Substrate is connected to V+.

REV. B

–3–

AD827

–Typical Characteristics

(@ +258C & 615 V, unless otherwise noted)

20

15

+V

IN

10

5

INPUT COMMON-MODE RANGE – Volts

0

0 5 10 15 20

SUPPLY VOLTAGE ± Volts

–V

IN

Figure 1. Input Common-Mode Range
vs. Supply Voltage

20

15

+V

OUT

10

–V

OUT

R

= 1kΩ

5

OUTPUT VOLTAGE SWING – Volts

0

0 5 10 15 20

SUPPLY VOLTAGE ± Volts

LOAD

Figure 2. Output Voltage Swing vs.
Supply Voltage

Figure 3. Output Voltage Swing vs.
Load Resistance

Figure 4. Quiescent Current vs.
Supply Voltage

14

12

VS = ±15V

10

QUIESCENT CURRENT – mA

8

0

–60 0 40 100 140

–40 –20 20 60 80 120

VS = ±5V

TEMPERATURE – °C

Figure 7. Quiescent Current vs.
Temperature

Figure 5. Input Bias Current vs.
Temperature

Figure 8. Short-Circuit Current
Limit vs. Temperature

Figure 6. Closed-Loop Output
Impedance vs. Frequency, Gain = +1

Figure 9. Gain Bandwidth vs.
Temperature

–4–

REV. B

AD827

400

350

300

250

200

150

100

–60 –40 –20

0

20 40

60

80 100 120 140

TEMPERATURE – °C

SLEW RATE – Volts/µs

AV = +1
SLEW RATE 10 – 90%

RISE

FALL

RISE

FALL

VS = ±15V

VS = ±5V

Figure 10. Open-Loop Gain and
Phase Margin vs. Frequency

Figure 13. Common-Mode
Rejection Ratio vs. Frequency

Figure 11. Open-Loop Gain vs.
Load Resistance

Figure 14. Large Signal Frequency
Response

Figure 12. Power Supply Rejection
Ratio vs. Frequency

Figure 15. Output Swing and Error
vs. Settling Time

REV. B

Figure 16. Harmonic Distortion vs.
Frequency

Figure 17. Input Voltage Noise
Spectral Density

–5–

Figure 18. Slew Rate vs.
Temperature

AD827

Figure 19. Crosstalk vs. Frequency

INPUT PROTECTION PRECAUTIONS

An input resistor (resistor RIN of Figure 21a) is recommended in
circuits where the input common-mode voltage to the AD827
may exceed (on a transient basis) the positive supply voltage.
This resistor provides protection for the input transistors by
limiting the maximum current that can be forced into their
bases.

Figure 21a. Follower Connection

Figure 21b. Follower Large Signal
Pulse Response

Figure 20. Crosstalk Test Circuit

For high performance circuits, it is recommended that a second
resistor (R
current errors by matching the impedance at each input. This
resistor reduces the error caused by offset voltages by more than
an order of magnitude.

in Figures 21a and 22a) be used to reduce bias-

B

Figure 21c. Follower Small
Signal Pulse Response

Figure 22a. Inverter Connection

Figure 22b. Inverter Large Signal
Pulse Response

–6–

Figure 22c. Inverter Small
Signal Pulse Response

REV. B

AD827

S

+V

IN

VIDEO LINE DRIVER

The AD827 functions very well as a low cost, high speed line
driver for either terminated or unterminated cables. Figure 23
shows the AD827 driving a doubly terminated cable in a
follower configuration.

Figure 23. A Video Line Driver

The termination resistor, RT, (when equal to the cable’s
characteristic impedance) minimizes reflections from the far end
of the cable. While operating from ±5 V supplies, the AD827
maintains a typical slew rate of 200 V/µs, which means it can
drive a ±1 V, 30 MHz signal into a terminated cable.

A HIGH SPEED 3 OP AMP INSTRUMENTATION
AMPLIFIER CIRCUIT

The instrumentation amplifier circuit shown in Figure 24 can
provide a range of gains. The chart of Table II details
performance.

+V

S

0.1µF

–V

IN

R

G

8

3

+

1/2

AD827

2

–

1kΩ

TRIM FOR
OPTIMUM

BANDWIDTH

7 – 15 pF

1kΩ

6

–

1/2

AD827

5

+

4

–V

1

2kΩ

2kΩ

3pF

7

0.1µF

NOTE: PINOUT SHOWN IS FOR MINIDIP PACKAGE

TRIM FOR BEST
SETTLING TIME

2 – 8pF

2kΩ

+V

S

0.1µF

7

2

–

6

AD847

3

+

4

0.1µF 2kΩ

2kΩ

–V

S

CIRCUIT GAIN = + 1

2000

R

G

V

OUT

R

L

Figure 24. A High Bandwidth Three Op Amp
Instrumentation Amplifier

Table II. Performance Specifications for the
Three Op Amp Instrumentation Amplifier

Table I. Video Line Driver Performance Summary

Over-

VIN* V

SUPPLYCC

–3 dB BWshoot

0 dB or ±500 mV Step ±15 20 pF 23 MHz 4%
0 dB or ±500 mV Step ±15 15 pF 21 MHz 0%
0 dB or ±500 mV Step ±15 0 pF 13 MHz 0%
0 dB or ±500 mV Step ±5 20 pF 18 MHz 2%
0 dB or ±500 mV Step ±5 15 pF 16 MHz 0%
0 dB or ±500 mV Step ±5 0 pF 11 MHz 0%

NOTE
*–3 dB bandwidth numbers are for the 0 dBm signal input. Overshoot numbers

are the percent overshoot of the 1 Volt step input.

A back-termination resistor (RBT, also equal to the characteristic
impedance of the cable) may be placed between the AD827
output and the cable input, in order to damp any reflected
signals caused by a mismatch between RT and the cable’s
characteristic impedance. This will result in a flatter frequency
response, although this requires that the op amp supply ±2 V to
the output in order to achieve a ±1 V swing at resistor RT.

Small Signal
Bandwidth

Gain R

G

@ 1 V p-p Output

1 Open 16.1 MHz
2 2 k 14.7 MHz
10 226 Ω 4.9 MHz
100 20 Ω 660 kHz

A TWO-CHIP VOLTAGE-CONTROLLED AMPLIFIER (VCA) WITH EXPONENTIAL RESPONSE

Voltage-controlled amplifiers are often used as building blocks
in automatic gain control systems. Figure 25 shows a two-chip
VCA built using the AD827 and the AD539, a dual, current­output multiplier. As configured, the circuit has its two

INPUT RANGE:
10MV TO 3V (55dB)

V

V

IN

0.01µF

4.7Ω

+5V

4.7Ω

–5V

0.1µF

*PINOUT SHOWN IS FOR MINI-DIP PACKAGE

V AT TERMINATION RESISTOR, R =

V AT PIN & OF AD827 =

OUT

X

0.1µF

1

CONTROL

2

HF COMP

3

CH 1
IN

4

+V

5

–V
CH2

6

IN
INPUT

7

COM

8

OUTPUT
COM

AD539

S

S

V

X2IN

4V

V

2

CH1
OUT

BASE

COM

CH2
OUT

TOUT

W1

Z1

Z2

W2

V

16

15
14

13
12
11

10
9

X2IN

8V

2pF

C

2pF

C

4

V

2

+5V

0.1µF

2

–

8

1/2

AD827

3

3

1

+

*

5

6

+

1/2

AD827

–

–5V

*

4

0.1µF

7

COAX LINE

50Ω

R

T

OUTPUT

50Ω

Figure 25. A Wide Range Voltage-Controlled
Amplifier Circuit

AD827

multipliers connected in series. They could also be placed in
parallel with an increase in bandwidth and a reduction in gain.
The gain of the circuit is controlled by V

, which can range

X

from 0 to 3 V dc. Measurements show that this circuit easily
supplies 2 V p-p into a 100 Ω load while operating from ±5 V
supplies. The overall bandwidth of the circuit is approximately
7 MHz with 0.5 dB of peaking.

Each half of the AD827 serves as an I/V converter and converts
the output current of one of the two multipliers in the AD539
into an output voltage. Each of the AD539’s two multipliers
contains two internal 6 kΩ feedback resistors; one is connected
between the CH1 output and Z1, the other between the CH1
output and W1. Likewise, in the CH2 multiplier, one of the
feedback resistors is connected between CH2 and Z2 and the
other is connected between CH2 and Z2. In Figure 25, Z1 and
W1 are tied together, as are Z2 and W2, providing a 3 kΩ
feedback resistor for the op amp. The 2 pF capacitors connected
between the AD539’s W1 and CH1 and W2 and CH2 pins are
in parallel with the feedback resistors and thus reduce peaking
in the VCA’s frequency response. Increasing the values of C3
and C4 can further reduce the peaking at the expense of
reduced bandwidth. The 1.25 mA full-scale output current of
the AD539 and the 3 kΩ feedback resistor set the full-scale
output voltage of each multiplier at 3.25 V p-p.

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

Current limiting in the AD827 (typically 30 mA) limits the out­put voltage in this application to about 3 V p-p across a 100 Ω
load. Driving a 50 Ω reverse-terminated load divides this value
by two, limiting the maximum signal delivered to a 50 Ω load to
about 1.5 V p-p, which suffices for video signal levels. The
dynamic range of this circuit is approximately 55 dB and is
primarily limited by feedthrough at low input levels and by the
maximum output voltage at high levels.

Guidelines for Grounding and Bypassing

When designing practical high frequency circuits using the
AD827, some special precautions are in order. Both short
interconnection leads and a large ground plane are needed
whenever possible to provide low resistance, low inductance
circuit paths. One should remember to minimize the effects of
capacitive coupling between circuits. Furthermore, IC sockets
should be avoided. Feedback resistors should be of a low
enough value that the time constant formed with stray circuit
capacitances at the amplifier summing junction will not limit
circuit performance. As a rule of thumb, use feedback resistor
values that are less than 5 kΩ. If a larger resistor value is
necessary, a small (<10 pF) feedback capacitor in parallel with
the feedback resistor may be used. The use of 0.1 µF ceramic
disc capacitors is recommended for bypassing the op amp’s
power supply leads.

C1407–24–4/90

8-Pin Mini-DIP (N) Package

16-Pin SOIC (R) Package

8-Pin Cerdip (Q) Package

20-Terminal Leadless Ceramic Chip Carrier

(E-20A)

PRINTED IN U.S.A.

–8–

REV. B