Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp Voltage feedback SOIC 8

REV. B

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AD826

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700 World Wide Web Site: http://www.analog.com

Fax: 781/326-8703 © Analog Devices, Inc., 2000

High-Speed, Low-Power

Dual Operational Amplifier

CONNECTION DIAGRAM

8-Lead Plastic Mini-DIP and SO Package

AD826

V+

OUT2

–IN2

+IN2

OUT1

–IN1

+IN1

V–

The AD826 features high output current drive capability of

50 mA min per amp, and is able to drive unlimited capacitive

loads. With a low power supply current of 15 mA max for both

amplifiers, the AD826 is a true general purpose operational

amplifier.

The AD826 is ideal for power sensitive applications such as video

cameras and portable instrumentation. The AD826 can operate

from a single +5 V supply, while still achieving 25 MHz of band-

width. Furthermore the AD826 is fully specified from a single

+5 V to ±15 V power supplies.

The AD826 excels as an ADC/DAC buffer or active filter in

data acquisition systems and achieves a settling time of 70 ns

to 0.01%, with a low input offset voltage of 2 mV max. The

AD826 is available in small 8-lead plastic mini-DIP and SO

packages.

100

500ns

= 100pF

= 1000pF

FEATURES

High Speed:

50 MHz Unity Gain Bandwidth

350 V/s Slew Rate

70 ns Settling Time to 0.01%

Low Power:

7.5 mA Max Power Supply Current Per Amp

Easy to Use:

Drives Unlimited Capacitive Loads

50 mA Min Output Current Per Amplifier

Specified for +5 V, 5 V and 15 V Operation

2.0 V p-p Output Swing into a 150  Load

= +5 V)

Good Video Performance

Differential Gain & Phase Error of 0.07% & 0.11

Excellent DC Performance:

2.0 mV Max Input Offset Voltage

APPLICATIONS

Unity Gain ADC/DAC Buffer

Cable Drivers

8- and 10-Bit Data Acquisition Systems

Video Line Driver

Active Filters

PRODUCT DESCRIPTION

The AD826 is a dual, high speed voltage feedback op amp. It

is ideal for use in applications which require unity gain stability

and high output drive capability, such as buffering and cable

driving. The 50 MHz bandwidth and 350 V/µs slew rate make

the AD826 useful in many high speed applications including:

video, CATV, copiers, LCDs, image scanners and fax machines.

TEKTRONIX

P6201 FET

PROBE

HP PULSE

GENERATOR

1/2

AD826

1k

50

1k

OUT

TEKTRONIX

7A24 FET

PREAMP

V

0.01F

3.3F

0.01F

–V

3.3F

Driving a Large Capacitive Load

Summary of content (14 pages)

PAGE 1
a High-Speed, Low-Power Dual Operational Amplifier AD826 FEATURES High Speed: 50 MHz Unity Gain Bandwidth 350 V/ s Slew Rate 70 ns Settling Time to 0.01% Low Power: 7.5 mA Max Power Supply Current Per Amp Easy to Use: Drives Unlimited Capacitive Loads 50 mA Min Output Current Per Amplifier Specified for +5 V, 5 V and 15 V Operation 2.0 V p-p Output Swing into a 150 Load (VS = +5 V) Good Video Performance Differential Gain & Phase Error of 0.07% & 0.11 Excellent DC Performance: 2.
PAGE 2
AD826–SPECIFICATIONS (@ T = +25 C, unless otherwise noted) A Parameter Conditions DYNAMIC PERFORMANCE Unity Gain Bandwidth Bandwidth for 0.1 dB Flatness Gain = +1 Full Power Bandwidth1 VOUT = 5 V p-p RLOAD = 500 Ω VOUT = 20 V p-p RLOAD = 1 kΩ RLOAD = 1 kΩ Gain = –1 Slew Rate Settling Time to 0.1% to 0.
PAGE 3
AD826 Parameter OUTPUT CHARACTERISTICS Output Voltage Swing Conditions VS Min Typ RLOAD = 500 Ω RLOAD = 150 Ω RLOAD = 1 kΩ RLOAD = 500 Ω RLOAD = 500 Ω ±5 V ±5 V ± 15 V ± 15 V 0, +5 V 3.3 3.2 13.3 12.8 +1.5, +3.5 50 50 30 3.8 3.6 13.7 13.
PAGE 4
AD826 – Typical Characteristics 7.7 QUIESCENT SUPPLY CURRENT PER AMP – mA INPUT COMMON-MODE RANGE – Volts 20 15 +VCM 10 –VCM 5 0 0 5 15 10 7.2 +85 C –40 C 6.2 5.7 20 0 5 SUPPLY VOLTAGE – Volts 20 Figure 4. Quiescent Supply Current per Amp vs. Supply Voltage for Various Temperatures 20 400 15 350 SLEW RATE – V/ s OUTPUT VOLTAGE SWING – Volts 15 10 SUPPLY VOLTAGE – Volts Figure 1. Common-Mode Voltage Range vs.
PAGE 5
100 6 80 5 4 3 +100 PHASE 5V OR 15V SUPPLIES +80 GAIN 15V SUPPLIES 60 +60 40 +40 GAIN 5V SUPPLIES +20 20 2 0 PHASE MARGIN – Degrees 7 OPEN-LOOP GAIN – dB INPUT BIAS CURRENT – A AD826 0 RL = 1k 1 –60 –40 –20 0 20 40 60 80 100 120 –20 140 1k 10k 100k 1M 10M FREQUENCY – Hz TEMPERATURE – C Figure 7. Input Bias Current vs. Temperature 100M 1G Figure 10. Open-Loop Gain and Phase Margin vs.
PAGE 6
AD826 –40 140 VIN = 1V p-p GAIN = +2 HARMONIC DISTORTION – dB –50 CMR – dB 120 100 80 –60 –70 –80 2ND HARMONIC –90 3RD HARMONIC –100 100 60 1k 10k 1M 100k 10M 1k 10k Figure 13. Common-Mode Rejection vs. Frequency 10M 1M Figure 16. Harmonic Distortion vs.
PAGE 7
AD826 5 5 4 0.1dB VS FLATNESS 15V 55MHz 5V 20MHz 5V 20MHz 781 3 VOUT VIN 150 2 GAIN – dB 0 –1 VS = 5V –2 15V 3pF 5V 4pF 5V 6pF 1 16MHz 14MHz 12MHz VS = 15V 0 VS = 5V –1 VS = 5V –4 1M 10M FREQUENCY – Hz –5 100k 100M 0.07 0.12 0.8 0.6 0.4 GAIN – dB 0.10 0.13 100M 1.0 DIFFERENTIAL GAIN – Percent 0.13 DIFF GAIN 1M 10M FREQUENCY – HZ Figure 22. Closed-Loop Gain vs. Frequency, Gain = –1 Figure 19. Closed-Loop Gain vs.
PAGE 8
AD826 1k VS 3.3 F 0.01 F RIN PULSE (LS) VIN 100 OR FUNCTION (SS) 50 GENERATOR VOUT 1/2 AD826 TEKTRONIX P6201 FET PROBE TEKTRONIX 7A24 PREAMP 0.01 F RL 3.3 F –VS Figure 25. Noninverting Amplifier Configuration 5V 200mV 50ns 100 100 90 90 10 10 0% 0% 200mV 5V Figure 26. Noninverting Large Signal Pulse Response, R L = 1 kΩ 5V 50ns Figure 28. Noninverting Small Signal Pulse Response, R L = 1 kΩ 50ns 5V 200mV 100 100 90 90 10 10 0% 0% 5V 50ns 200mV Figure 27.
PAGE 9
AD826 1k VS 3.3 F PULSE (LS) OR FUNCTION (SS) GENERATOR VIN 0.01 F RIN 1k 50 1/2 AD826 TEKTRONIX P6201 FET PROBE VOUT TEKTRONIX 7A24 PREAMP 0.01 F RL 3.3 F –VS Figure 30. Inverting Amplifier Configuration 5V 200mV 50ns 100 100 90 90 10 10 0% 0% 200mV 5V Figure 31. Inverting Large Signal Pulse Response, RL = 1 kΩ 5V Figure 33. Inverting Small Signal Pulse Response, RL = 1 kΩ 200mV 50ns 100 100 90 90 10 10 0% 0% 5V 50ns 200mV Figure 32.
PAGE 10
AD826 THEORY OF OPERATION INPUT CONSIDERATIONS The AD826 is a low cost, wide band, high performance dual operational amplifier which can drive heavy capacitive and resistive loads. It also achieves a constant slew rate, bandwidth and settling time over its entire specified temperature range. An input protection resistor (RIN in Figure 25) is required in circuits where the input to the AD826 will be subjected to transient or continuous overload voltages exceeding the ± 6 V maximum differential limit.
PAGE 11
AD826 SINGLE SUPPLY OPERATION R3 and C2 reduce the effect of the power supply changes on the An exciting feature of the AD826 is its ability to perform well in a single supply configuration (see Figure 37). The AD826 is ideally suited for applications that require low power dissipation and high output current and those which need to drive large capacitive loads, such as high speed buffering and instrumentation.
PAGE 12
AD826 SINGLE-ENDED TO DIFFERENTIAL LINE DRIVER Outstanding CMRR (> 80 dB @ 5 MHz), high bandwidth, wide supply voltage range, and the ability to drive heavy loads, make the AD826 an ideal choice for many line driving applications. In this application, the AD830 high speed video difference amp serves as the differential line receiver on the end of a back terminated, 50 ft., twisted-pair transmission line (see Figure 40). The overall system is configured in a gain of +1 and has a –3 dB bandwidth of 14 MHz.
PAGE 13
AD826 HIGH PERFORMANCE ADC BUFFER 1k Figure 42 is a schematic of a 12-bit high speed analog-to-digital converter. The AD826 dual op amp takes a single ended input and drives the AD872 A/D converter differentially, thus reducing 2nd harmonic distortion. Figure 43 is a FFT of a 1 MHz input, sampled at 10 MHz with a THD of –78 dB. The AD826 can be used to amplify low level signals so that the entire range of the converter is used.
PAGE 14
AD826 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8 C1807a–0–6/00 (rev. B) 00877 8-Lead Plastic Mini-DIP (N) Package 5 0.25 (6.35) PIN 1 1 0.31 (7.87) 4 0.30 (7.62) REF 0.39 (9.91) MAX 0.035±0.01 (0.89±0.25) 0.165±0.01 (4.19±0.25) 0.18±0.03 (4.57±0.76) 0.125 (3.18) MIN 0.018±0.003 (0.46±0.08) 0.10 (2.54) BSC 0.033 (0.84) NOM 0.011±0.003 (0.28±0.08) 15 ° 0° SEATING PLANE 8-Lead SO (R) Package 0.1968 (5.00) 0.1890 (4.80) 0.1574 (4.00) 0.1497 (3.80) 8 5 1 4 0.2440 (6.20) 0.