Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp Multi-purpose SOIC 8

CONNECTION DIAGRAM

Plastic DIP (N),

Small Outline (R) and

Cerdip (Q) Packages

REV. F

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.

High Speed, Low Power

Monolithic Op Amp

AD847

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

Tel: 617/329-4700 Fax: 617/326-8703

FEATURES

Superior Performance

High Unity Gain BW: 50 MHz

Low Supply Current: 5.3 mA

High Slew Rate: 300 V/ms

Excellent Video Specifications

0.04% Differential Gain (NTSC and PAL)

0.198 Differential Phase (NTSC and PAL)

Drives Any Capacitive Load

Fast Settling Time to 0.1% (10 V Step): 65 ns

Excellent DC Performance

High Open-Loop Gain 5.5 V/mV (R

LOAD

= 1 kV)

Low Input Offset Voltage: 0.5 mV

Specified for 65 V and 615 V Operation

Available in a Wide Variety of Options

Plastic DIP and SOIC Packages

Cerdip Package

Die Form

MIL-STD-883B Processing

Tape & Reel (EIA-481A Standard)

Dual Version Available: AD827 (8 Lead)

Enhanced Replacement for LM6361

Replacement for HA2544, HA2520/2/5 and EL2020

APPLICATIONS

Video Instrumentation

Imaging Equipment

Copiers, Fax, Scanners, Cameras

High Speed Cable Driver

High Speed DAC and Flash ADC Buffers

PRODUCT DESCRIPTION

The AD847 represents a breakthrough in high speed amplifiers

offering superior ac & dc performance and low power, all at low

cost. The excellent dc performance is demonstrated by its ±5 V

020

5.5

4.5

SUPPLY VOLTAGE – ± Volts

QUIESCENT CURRENT – mA

Quiescent Current vs. Supply Voltage

specifications which include an open-loop gain of 3500 V/V

(500 Ω load) and low input offset voltage of 0.5 mV. Common-

mode rejection is a minimum of 78 dB. Output voltage swing is

±3 V into loads as low as 150 Ω. Analog Devices also offers

over 30 other high speed amplifiers from the low noise AD829

(1.7 nV/√

Hz) to the ultimate video amplifier, the AD811, which

features 0.01% differential gain and 0.01° differential phase.

APPLICATION HIGHLIGHTS

1. As a buffer the AD847 offers a full-power bandwidth of

12.7 MHz (5 V p-p with ±5 V supplies) making it outstand-

ing as an input buffer for flash A/D converters.

2. The low power and small outline package of the AD847

make it very well suited for high density applications such as

multiple pole active filters.

3. The AD847 is internally compensated for unity gain opera-

tion and remains stable when driving any capacitive load.

AD847 Driving Capacitive Loads

Summary of content (12 pages)

PAGE 1
a High Speed, Low Power Monolithic Op Amp AD847 FEATURES Superior Performance High Unity Gain BW: 50 MHz Low Supply Current: 5.3 mA High Slew Rate: 300 V/ms Excellent Video Specifications 0.04% Differential Gain (NTSC and PAL) 0.198 Differential Phase (NTSC and PAL) Drives Any Capacitive Load Fast Settling Time to 0.1% (10 V Step): 65 ns Excellent DC Performance High Open-Loop Gain 5.5 V/mV (RLOAD = 1 kV) Low Input Offset Voltage: 0.
PAGE 2
AD847–SPECIFICATIONS (@ T = +258C, unless otherwise noted) A Model Conditions INPUT OFFSET VOLTAGE1 VS ±5 V Min AD847J Typ 0.5 TMIN to TMAX Offset Drift Min 15 INPUT BIAS CURRENT INPUT OFFSET CURRENT 6.6 7.2 3.3 6.6 10 µA µA ± 5 V, ± 15 V 50 300 400 50 300 500 nA nA nA/°C Offset Current Drift 0.3 VOUT = ± 2.5 V RLOAD = 500 Ω TMIN to TMAX RLOAD = 150 Ω VOUT = ± 10 V RLOAD = 1 kΩ TMIN to TMAX DYNAMIC PERFORMANCE Unity Gain Bandwidth 2 Slew Rate3 Settling Time to 0.
PAGE 3
AD847 Model Conditions INPUT OFFSET VOLTAGE1 VS ±5 V Min TMIN to TMAX Offset Drift INPUT BIAS CURRENT AD847AQ Typ Max 0.5 1 4 15 Full Power Bandwidth2 Slew Rate3 Settling Time to 0.1%, RLOAD = 250 Ω to 0.01%, RLOAD = 250 Ω Phase Margin Differential Gain Differential Phase 15 3.3 5 7.5 µA µA ± 5 V, ± 15 V 50 300 400 50 300 400 nA nA nA/°C 0.3 DYNAMIC PERFORMANCE Unity Gain Bandwidth VOUT = 5 V p-p RLOAD = 500 Ω, VOUT = 20 V p-p, RLOAD = 1 kΩ RLOAD = 1 kΩ –2.5 V to +2.
PAGE 4
AD847 ABSOLUTE MAXIMUM RATINGS 1 ESD SUSCEPTIBILITY Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V Internal Power Dissipation2 Plastic (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Watts Small Outline (R) . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 Watts Cerdip (Q) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Watts Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
AD847 Typical Characteristics (@ +258C and V = 615 V, unless otherwise noted) S 20 OUTPUT VOLTAGE SWING – Volts INPUT COMMON-MODE RANGE – ± Volts 20 15 +VIN 10 –VIN 5 15 +VOUT 10 –VOUT 5 R LOAD = 500Ω 0 0 0 5 15 10 0 20 5 SUPPLY VOLTAGE – ± Volts Figure 1. Input Common-Mode Range vs. Supply Voltage 20 Figure 2. Output Voltage Swing vs.
PAGE 6
AD847–Typical Characteristics (@ +258C and V = 615 V, unless otherwise noted) S 35 SHORT CIRCUIT CURRENT LIMIT – mA 6 5 4 VS = ± 5V 3 –60 –40 –20 0 20 40 60 80 100 120 30 25 20 15 –60 140 –40 –20 TEMPERATURE – °C 100 140 +100° 80 +80° ±15V SUPPLIES 1kΩ LOAD 51 OPEN -LOOP GAIN – dB UNITY – GAIN BANDWIDTH – MHz 52 50 49 60 +60° ±5V SUPPLIES 500Ω LOAD 40 +40° 20 +20° 0 48 –60 120 Figure 8. Short-Circuit Current Limit vs. Temperature Figure 7. Quiescent Current vs.
PAGE 7
AD847 100 80 OUTPUT VOLTAGE – Volts p–p 30 VCM = ±1V p-p CMR – dB 60 40 20 25 20 RL = 1kΩ 15 10 5 0 0 1k 10k 100k 1M 10M 1M 100M 10M 100M INPUT FREQUENCY – Hz FREQUENCY – Hz Figure 14. Large Signal Frequency Response Figure 13. Common-Mode Rejection vs. Frequency –70 10 HARMONIC DISTORTION – dB OUTPUT SWING FROM 0 TO ± V 8 6 4 2 1% 0.1% 1% 0.
PAGE 8
AD847 Figure 19. Inverting Amplifier Configuration Figure 19a. Inverter Large Signal Pulse Response Figure 19b. Inverter Small Signal Pulse Response Figure 20. Noninverting Amplifier Configuration Figure 20a. Noninverting Large Signal Pulse Response Figure 20b. Noninverting Small Signal Pulse Response –8– REV.
PAGE 9
AD847 OFFSET NULLING +VS The input offset voltage of the AD847 is very low for a high speed op amp, but if additional nulling is required, the circuit shown in Figure 21 can be used. CF OUTPUT –IN +IN –VS Figure 21. Offset Nulling NULL 1 NULL 8 INPUT CONSIDERATIONS An input resistor (RIN in Figure 20) is required in circuits where the input to the AD847 will be subjected to transient or continuous overload voltages exceeding the ± 6 V maximum differential limit.
PAGE 10
AD847 VIDEO LINE DRIVER Figure 24 shows the AD847 driving 100 pF and 1000 pF loads. The AD847 functions very well as a low cost, high speed line driver for either terminated or unterminated cables. Figure 23 shows the AD847 driving a doubly terminated cable in a follower configuration. The termination resistor, RT, (when equal to the cable’s characteristic impedance) minimizes reflections from the far end of the cable.
PAGE 11
AD847 The input amplifier (A1 and A2) is an AD827, which is a dual version of the AD847. This circuit has the optional flexibility of both dc and ac trims for common-mode rejection, plus the ability to adjust for minimum settling time. A High Speed, Three Op-Amp In-Amp The circuit of Figure 26 lends itself well to CCD imaging and other video speed applications. It uses two high speed CB process op-amps: Amplifier A3, the output amplifier, is an AD847.
PAGE 12
AD847 HIGH SPEED DAC BUFFER C1191f–10–9/92 (10.24 V for a 1 kΩ resistor). Note that since the DAC generates a positive current to ground, the voltage at the amplifier output will be negative. A 100 Ω series resistor between the noninverting amplifier input and ground minimizes the offset effects of op amp input bias currents. The wide bandwidth and fast settling time of the AD847 makes it a very good output buffer for high speed current-output D/A converters like the AD668.