Datasheet AD844 (Analog Devices)

60 MHz, 2000 V/μs, Monolithic Op Amp with Quad Low Noise Data Sheet AD844 FEATURES FUNCTIONAL BLOCK DIAGRAMS Wide bandwidth NULL 1 8 AD844 NULL 60 MHz at gain of −1 –IN 2 7 +VS 33 MHz at gain of −10 +IN 3 6 OUTPUT Slew rate: 2000 V/μs –VS 4 5 TZ
01
20 MHz full power bandwidth, 20 V p-p, R
0
L = 500 Ω TOP VIEW
7-
(Not to Scale)
089
Fast settling: 100 ns to 0.1% (10 V step)
0
Differential gain error: 0.03% at 4.4 MHz
Figure 1. 8-Lead PDIP (N) and 8-Lead CERDIP (Q) Packages
Differential phase error: 0.16° at 4.4 MHz NC 1 16 NC Low offset voltage: 150 μV maximum (B Grade) OFFSETNULL 2 15 OFFSETNULL Low quiescent current: 6.5 mA –IN 3 14 V+ Available in tape and reel in accordance with NC 4 13 NC EIA-481-A standard +IN 5 12 OUTPUT NC 6 11 TZ AD844 APPLICATIONS V– 7 10 NC TOP VIEW NC 8 (Not to Scale) 9 NC
2
Flash ADC input amplifiers
00 7-
NC = NO CONNECT
89
High speed current DAC interfaces
00
Video buffers and cable drivers
Figure 2. 16-Lead SOIC (R) Package
Pulse amplifiers GENERAL DESCRIPTION
The AD844A and AD844B are specified for the industrial The AD844 is a high speed monolithic operational amplifier temperature range of −40°C to +85°C and are available in the fabricated using the Analog Devices, Inc., junction isolated CERDIP (Q) package. The AD844A is also available in an 8-lead complementary bipolar (CB) process. It combines high band- PDIP (N). The AD844S is specified over the military temperature width and very fast large signal response with excellent dc range of −55°C to +125°C. It is available in the 8-lead CERDIP performance. Although optimized for use in current-to-voltage (Q) package. A and S grade chips and devices processed to applications and as an inverting mode amplifier, it is also suitable MIL-STD-883B, Rev. C are also available. for use in many noninverting applications.
PRODUCT HIGHLIGHTS
The AD844 can be used in place of traditional op amps, but its 1. The AD844 is a versatile, low cost component providing an current feedback architecture results in much better ac perfor- excellent combination of ac and dc performance. mance, high linearity, and an exceptionally clean pulse response. 2. It is essentially free from slew rate limitations. Rise and fall This type of op amp provides a closed-loop bandwidth that is times are essentially independent of output level. determined primarily by the feedback resistor and is almost 3. The AD844 can be operated from ±4.5 V to ±18 V power independent of the closed-loop gain. The AD844 is free from supplies and is capable of driving loads down to 50 Ω, as the slew rate limitations inherent in traditional op amps and well as driving very large capacitive loads using an external other current-feedback op amps. Peak output rate of change can network. be over 2000 V/μs for a full 20 V output step. Settling time is 4. The offset voltage and input bias currents of the AD844 are typically 100 ns to 0.1%, and essentially independent of gain. laser trimmed to minimize dc errors; VOS drift is typically 1 The AD844 can drive 50 Ω loads to ±2.5 V with low distortion μV/°C and bias current drift is typically 9 nA/°C. and is short-circuit protected to 80 mA. 5. The AD844 exhibits excellent differential gain and differential phase characteristics, making it suitable for a The AD844 is available in four performance grades and three variety of video applications with bandwidths up to 60 MHz. package options. In the 16-lead SOIC (RW) package, the AD844J 6. The AD844 combines low distortion, low noise, and low is specified for the commercial temperature range of 0°C to 70°C. drift with wide bandwidth, making it outstanding as an input amplifier for flash analog-to-digital converters (ADCs).
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAMS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS METALLIZATION PHOTOGRAPH ESD CAUTION TYPICAL PERFORMANCE CHARACTERISTICS INVERTING GAIN-OF-1 AC CHARACTERISTICS INVERTING GAIN-OF-10 AC CHARACTERISTICS INVERTING GAIN-OF-10 PULSE RESPONSE NONINVERTING GAIN-OF-10 AC CHARACTERISTICS UNDERSTANDING THE AD844 OPEN-LOOP BEHAVIOR RESPONSE AS AN INVERTING AMPLIFIER RESPONSE AS AN I-V CONVERTER CIRCUIT DESCRIPTION OF THE AD844 RESPONSE AS A NONINVERTING AMPLIFIER NONINVERTING GAIN OF 100 USING THE AD844 BOARD LAYOUT INPUT IMPEDANCE DRIVING LARGE CAPACITIVE LOADS SETTLING TIME DC ERROR CALCULATION NOISE VIDEO CABLE DRIVER USING ±5 V SUPPLIES HIGH SPEED DAC BUFFER 20 MHZ VARIABLE GAIN AMPLIFIER OUTLINE DIMENSIONS ORDERING GUIDE