Datasheet ADA4800 (Analog Devices)

link to page 12 link to page 12
Low Power, High Speed CCD Buffer Amplifier ADA4800 FEATURES FUNCTIONAL BLOCK DIAGRAM Integrated active load and gain of 1 buffer ADA4800 Very low buffer power consumption IN 1 6 ISF As low as 20 mW on chip IISF Power save feature to reduce active load current by GPO IAL IBUFF control ICC High buffer speed VEE 2 5 VCC +1 400 MHz, −3 dB bandwidth 415 V/μs slew rate IIDRV Fast settling time to 1%, 2 V step: 5 ns
01
OUT 3 4 IDRV Adjustable buffer bandwidth
0 2- 16
Push-pull output stage
09 Figure 1.
Adjustable active load current Small package: 1.6 mm × 1.6 mm × 0.55 mm APPLICATIONS CCD image sensor output buffer Digital still cameras Camcorders GENERAL DESCRIPTION
The ADA4800 is voltage buffer integrated with an active load. The versatility of the ADA4800 allows for seamless interfacing The buffer is a low power, high speed, low noise, high slew rate, with many CCD sensors from various manufacturers. fast settling, fixed gain of 1 monolithic amplifier for charge- The ADA4800 is designed to operate at supply voltages as low coupled device (CCD) applications. For CCD applications, the as 4 V and up to 17 V. It is available in a 1.6 mm × 1.6 mm × active load current source (IAL) can load the open source CCD 0.55 mm, 6-lead LFCSP package and is rated to operate over the sensor outputs and the buffer can drive the AFE load. The active industrial temperature range of −40oC to +85oC. current load can also be switched off, to use the ADA4800 as just
VISF
a unity gain buffer. The buffer consumes only 20 mW of static
R + R
power. In applications where power savings is critical, the
3V ISF 0.1µF 10µF IDRV 15V 10kΩ 249kΩ
ADA4800 features a power save mode (see the Power Save
ISF VCC IDRV
Mode section), which further reduces the total current
6 5 4 IIDRV
consumption. The bandwidth of the ADA4800 buffer is also
IISF I
fully adjustable through the IDRV pin.
BUFF ADA4800 +1
The buffer of the ADA4800 employs a push-pull output stage architecture, providing drive current and maximum slew
I
capability for both rising and falling signal transitions. At a
AL 1 2 3 IN VEE OUT
5 mA quiescent current setting, it provides 400 MHz, −3 dB bandwidth, which makes this buffer well suited for CCD
49.9Ω 10Ω 1kΩ
sensors from machine vision to digital still camera applications.
22pF
2
7.5V 7.5V
The ADA4800 is ideal for driving the input of the Analog 10 2- 16 Devices, Inc., 12-bit and 14-bit high resolution analog 09 Figure 2. Typical Test Circuit front ends (AFE) such as the AD9928, AD9990, AD9920A, AD9923A, and AD997x family.
Rev. A 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2010 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS BUFFER ELECTRICAL CHARACTERISTICS ACTIVE CURRENT LOAD ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUIT THEORY OF OPERATION SETTING ACTIVE LOAD CURRENT WITH PIN 6 (ISF) SETTING BANDWIDTH WITH PIN 4 (IDRV) APPLICATIONS INFORMATION OPEN SOURCE CCD OUTPUT BUFFER POWER SAVE MODE POWER SUPPLY BYPASSING POWER SEQUENCING OUTLINE DIMENSIONS ORDERING GUIDE