Analog Devices AD827 c Datasheet

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 5 V to 15 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 loads. It also features a low input voltage noise of 15 nV/Hz, 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 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.
Dual Op Amp
AD827

CONNECTION DIAGRAMS

8-Lead Plastic (N) and Cerdip
(Q) Packages
20-Lead 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 and 75 Ω reverse- terminated 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-lead plastic mini-DIP and cerdip, 20-lead LCC, and 16-lead SOIC packages. Chips and MIL-STD-883B processing are also available.
16-Lead Small Outline
(R) Package
REV. C
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 that 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: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002
AD827–SPECIFICATIONS
(@ TA = +25C, 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 Unit
3.5 4 mV
±15 V 4 4 mV
to T
T
MIN
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
to T
T
MIN
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 78 95 8095 dB
CM
= ±12 V ±15 V 78 95 8095 dB
V
CM
to T
T
MIN
MAX
±5 V to ± 15 V 75 75dB
Power Supply Rejection Ratio ±5 V to ± 15 V 75 86 7586 dB
T
MIN
to T
MAX
72 72 dB
Open-Loop Gain
= ±2.5 V ±5 V
V
O
= 500 2 3.5 2 3.5 V/mV
R
LOAD
to T
T R V R T
MIN
LOAD
OUT
LOAD
MIN
MAX
= 150 1.6 1.6 V/mV
= ±10 V ±15 V
= 1 k 3 5.5 3 5.5 V/mV
to T
MAX
11V/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,
= 500 Ω±5 V 12.7 12.7 MHz
R
LOAD
= 20 V p-p,
V
O
R
= 1 kΩ±15 V 4.7 4.7 MHz
LOAD
R
= 500 Ω±5 V 200 200 V/µs
LOAD
= 1 kΩ±15 V 300 300 V/µs
R
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
= 1 k 50 50 Degrees
R
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/Hz Input Current Noise f = 10 kHz ± 15 V 1.5 1.5 pA/Hz 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
= 1 kΩ±15 V 12 13.3 12 13.3 ±V
R
LOAD
= 500 Ω±15 V 10 12.2 10 12.2 ± V
R
LOAD
Short-Circuit Current Limit ±5 V to ± 15 V 32 32 mA
INPUT CHARACTERISTICS
Input Resistance 300 300 k Input Capacitance 1.5 1.5 pF
–2–
REV. C
AD827
AD827J AD827A/S
Model Conditions V
S
OUTPUT RESISTANCE Open Loop 15 15
POWER SUPPLY
Operating Range ±4.5 ± 18 ±4.5 ±18 V Quiescent Current ±5 V 10 13 1013 mA
to T
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 Unit
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: MiniDIP: θJA = 100°C/W; θ Cerdip: θJA = 110°C/W; θ 16-Lead Small Outline Package: θJA = 100°C/W 20-Lead LCC: θJA = 150°C/W; θJC = 35°C/W
3
Indefinite short circuit duration is only permissible as long as the absolute maximum power rating is not exceeded.
= 33°C/ W
JC
= 30°C/W
JC

ORDERING GUIDE

Temperature Package Package
Model Range Description Option
AD827JN 0°C to +70°C8-Lead Plastic DIP N-8 AD827JR 0°C to +70°C 16-Lead Plastic SO R-16 AD827AQ –40°C to +85°C8-Lead Cerdip Q-8 AD827SQ –55°C to +125°C8-Lead Cerdip Q-8 AD827SQ/883B –55°C to +125°C8-Lead Cerdip Q-8 5962-9211701MPA –55°C to +125°C8-Lead Cerdip Q-8 AD827SE/883B –55°C to +125°C 20-Lead LCC E-20A 5962-9211701M2A –55°C to +125°C 20-Lead LCC E-20A AD827JR-REEL 0°C to +70°CTape & Reel AD827JChips 0°C to +70°CDie AD827SChips –55°C to +125°CDie

METALLIZATION PHOTOGRAPH

Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
Substrate is connected to V+.
REV. C
–3–
AD827
–Typical Performance Characteristics
(@ +25C & 15 V, unless otherwise noted)
20
15
+V
IN
10
5
INPUT COMMON-MODE RANGE – Volts
0
051015 20
SUPPLY VOLTAGE ± Volts
–V
IN
Figure1. InputCommon-Mode Range vs. Supply Voltage
20
15
+V
OUT
10
–V
OUT
R
= 1k
5
OUTPUT VOLTAGE SWING – Volts
0
051015 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. C
AD827
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
400
350
AV = +1
SLEW RATE 10 – 90%
300
250
VS = ±15V
RISE
FALL
RISE
Figure 16. Harmonic Distortion vs. Frequency
REV. C
Figure 17. Input Voltage Noise Spectral Density
–5–
200
SLEW RATE – Volts/µs
150
100
–60 –40 –20
Figure 18. Slew Rate vs. Temperature
VS = ±5V
20 40
0
TEMPERATURE – °C
80 100 120 140
60
FALL
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. C
AD827
T

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.
+V
S
V
IN
50
AD827
0.1 µF
R
500
500
50
BT
R
50
V
OU
T
1/2
0.1 µF
–V
S
C
C
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.
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 ± 50 pF11 MHz 0%
*–3 dB bandwidth numbers are for the 0 dBm signal input. Overshoot numbers
are the percent overshoot of the 1 V 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 R
and the cable’s
T
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 R
.
T

A HIGH SPEED THREE OP AMP INSTRUMENTATION AMPLIFIER CIRCUIT

The instrumentation amplifier circuit shown in Figure 24 can provide a range of gains. Table II details performance.
+V
S
0.1µF
–V
IN
3
8
+
1
1/2
AD827
2
1k
TRIM FOR
R
OPTIMUM
G
BANDWIDTH
7 – 15 pF
1k
6
1/2
AD827
+V
IN
5
+
4
0.1µF
–V
S
2k
2k
3pF
7
NOTE: PINOUT SHOWN IS FOR MINIDIP PACKAGE
TRIM FOR BEST SETTLING TIME
2 – 8pF
2k
+V
S
0.1µF
7
2
AD847
3
+
4
0.1µF
2k
–V
S
CIRCUIT GAIN =
6
2000
R
V
OUT
2k
R
L
+ 1
G
Figure 24. A High Bandwidth Three Op Amp Instrumentation Amplifier
Table II. Performance Specifications for the Three Op Amp Instrumentation Amplifier
Small Signal Bandwidth
Gain R
G
@ 1 V p-p Output
1 Open 16.1 MHz 22 k 14.7 MHz 10 226 4.9 MHz 100 20 660 kHz
REV. C
–7–
AD827

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
Figure 25. A Wide Range Voltage-Controlled Amplifier Circuit
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 from 0 to 3 V dc. Measurements show that this circuit easily supplies 2 V p-p into a 100 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 kfeedback resistors; one is connected
, which can range
X
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 k 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 kfeedback resistor set the full-scale output voltage of each multiplier at 3.25 V p-p.
Current limiting in the AD827 (typically 30 mA) limits the out­put voltage in this application to about 3 V p-p across a 100 load. Driving a 50 reverse-terminated load divides this value by two, limiting the maximum signal delivered to a 50 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 k. 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.
–8–
REV. C

OUTLINE DIMENSIONS

1
4
85
7.87 (0.3089)
5.59 (0.2201)
PIN 1
0.13 (0.0051) MIN
1.40 (0.0551) MAX
2.54 (0.1000) BSC
15 0
8.13 (0.3201)
7.37 (0.2902)
0.38 (0.0150)
0.20 (0.0079)
SEATING PLANE
5.08 (0.2000) MAX
10.29 (0.4051) MAX
3.81 (0.1500) MIN
5.08 (0.2000)
3.18 (0.1252)
0.58 (0.0228)
0.36 (0.0142)
1.78 (0.0701)
0.76 (0.0299)
1.52 (0.0600)
0.38 (0.0150)
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
1
20
4
9
8
13
19
14
3
18
BOTTOM
VIEW
0.71 (0.0278)
0.56 (0.0220)
45 TYP
0.38 (0.0150) MIN
1.40 (0.0551)
1.14 (0.0449)
1.27 (0.0500) BSC
1.91 (0.0752) REF
0.28 (0.0110)
0.18 (0.0071) R TYP
2.41 (0.0949)
1.90 (0.0748)
2.54 (0.1000) BSC
5.08 (0.2000) BSC
3.81 (0.1500) BSC
1.91
(0.0752)
REF
9.09 (0.3579)
8.69 (0.3421) SQ
9.09
(0.3579)
MAX
SQ
2.54 (0.1000)
1.63 (0.0642)
2.24 (0.0882)
1.37 (0.0539)
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
AD827
8-Lead Plastic Dual-in-Line Package [PDIP]
(N-8)
Dimensions shown in millimeters and (inches)
10.92 (0.4299)
8.84 (0.3480)
8
PIN 1
2.54 (0.1000)
5.33
(0.2098)
MAX
4.06 (0.1598)
2.93 (0.1154)
0.56 (0.0220)
0.36 (0.0142)
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
1
BSC
1.77 (0.0697)
1.15 (0.0453)
5
7.11 (0.2799)
6.10 (0.2402)
4
1.52 (0.0598)
0.38 (0.0150) (
3.30 (0.1299) MIN
SEATING PLANE
8.25 (0.3248)
7.62 (0.3000)
4.95 (0.1949)
2.93 (0.1154)
0.38 (0.0150)
0.20 (0.0079)
16-Lead Standard Small Outline Package [SOIC]
Wide Body
(R-16)
Dimensions shown in millimeters and (inches)
10.50 (0.4134)
10.10 (0.3976)
8-Lead Ceramic DIP-Glass Hermetic Seal Package [CERDIP]
(Q-8)
Dimensions shown in millimeters and (inches)
20-Terminal Ceramic Leadless Chip Carrier [LCC]
(E-20A)
Dimensions shown in millimeters and (inches)
9
8
2.65 (0.1043)
2.35 (0.0925)
SEATING PLANE
7.60 (0.2992)
7.40 (0.2913)
10.65 (0.4193)
10.00 (0.3937)
0.32 (0.0126)
0.23 (0.0091)
16
1
PIN 1
1.27 (0.0500) BSC
0.51 (0.0201)
0.33 (0.0130)
0.30 (0.0118)
0.10 (0.0039)
COPLANARITY
0.10
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
COMPLIANT TO JEDEC STANDARDS MS-013AA
REV. C
0.75 (0.0295)
0.25 (0.0098)
8 0
45
1.27 (0.0500)
0.40 (0.0157)
–9–
AD827

Revision History

Location Page
8/02—Data Sheet changed from REV. B to REV. C.
Updated Outline Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
–10–
REV. C
–11–
C00878–0–8/02(C)
–12–
PRINTED IN U.S.A.
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