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AD585SQ PDF预览

AD585SQ

更新时间: 2024-01-21 19:04:56
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亚德诺 - ADI 放大器
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6页 342K
描述
High Speed, Precision Sample-and-Hold Amplifier

AD585SQ 数据手册

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High Speed, Precision  
Sample-and-Hold Amplifier  
a
AD585  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
3.0 s Acquisition Time to ؎0.01% max  
Low Droop Rate: 1.0 mV/ms max  
Sample/Hold Offset Step: 3 mV max  
Aperture Jitter: 0.5 ns  
DIP  
LCC/PLCC Package  
Extended Temperature Range: –55؇C to +125؇C  
Internal Hold Capacitor  
Internal Application Resistors  
؎12 V or ؎15 V Operation  
Available in Surface Mount  
APPLICATIONS  
Data Acquisition Systems  
Data Distribution Systems  
Analog Delay & Storage  
Peak Amplitude Measurements  
MIL-STD-883 Compliant Versions Available  
The AD585 is available in three performance grades. The JP  
grade is specified for the 0°C to +70°C commercial temperature  
range and packaged in a 20-pin PLCC. The AQ grade is speci-  
fied for the –25°C to +85°C industrial temperature range and is  
packaged in a 14-pin cerdip. The SQ and SE grades are speci-  
fied for the –55°C to +125°C military temperature range and  
are packaged in a 14-pin cerdip and 20-pin LCC.  
PRODUCT DESCRIPTION  
The AD585 is a complete monolithic sample-and-hold circuit  
consisting of a high performance operational amplifier in series  
with an ultralow leakage analog switch and a FET input inte-  
grating amplifier. An internal holding capacitor and matched  
applications resistors have been provided for high precision and  
applications flexibility.  
The performance of the AD585 makes it ideal for high speed  
10- and 12-bit data acquisition systems, where fast acquisition  
time, low sample-to-hold offset, and low droop are critical. The  
AD585 can acquire a signal to ±0.01% in 3 µs maximum, and  
then hold that signal with a maximum sample-to-hold offset of  
3 mV and less than 1 mV/ms droop, using the on-chip hold  
capacitor. If lower droop is required, it is possible to add a  
larger external hold capacitor.  
PRODUCT HIGHLIGHTS  
1. The fast acquisition time (3 µs) and low aperture jitter  
(0.5 ns) make it the first choice for very high speed data  
acquisition systems.  
2. The droop rate is only 1.0 mV/ms so that it may be used in  
slower high accuracy systems without the loss of accuracy.  
3. The low charge transfer of the analog switch keeps sample-to  
hold offset below 3 mV with the on-chip 100 pF hold capaci-  
tor, eliminating the trade-off between acquisition time and  
S/H offset required with other SHAs.  
The high speed analog switch used in the AD585 exhibits  
aperture jitter of 0.5 ns, enabling the device to sample full scale  
(20 V peak-to-peak) signals at frequencies up to 78 kHz with  
12-bit precision.  
4. The AD585 has internal pretrimmed application resistors for  
applications versatility.  
The AD585 can be used with any user-defined feedback net-  
work to provide any desired gain in the sample mode. On-chip  
precision thin-film resistors can be used to provide gains of +1,  
–1, or +2. Output impedance in the hold mode is sufficiently  
low to maintain an accurate output signal even when driving the  
dynamic load presented by a successive-approximation A/D  
converter. However, the output is protected against damage  
from accidental short circuits.  
5. The AD585 is complete with an internal hold capacitor for  
ease of use. Capacitance can be added externally to reduce  
the droop rate when long hold times and high accuracy are  
required.  
6. The AD585 is recommended for use with 10- and 12-bit  
successive-approximation A/D converters such as AD573,  
AD574A, AD674A, AD7572 and AD7672.  
The control signal for the HOLD command can be either active  
high or active low. The differential HOLD signal is compatible  
with all logic families, if a suitable reference level is provided. An  
on-chip TTL reference level is provided for TTL compatibility.  
7. The AD585 is available in versions compliant with MIL-STD-  
883. Refer to the Analog Devices Military Products Databook  
or current AD585/883B data sheet for detailed specifications.  
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 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.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 617/329-4700  
Fax: 617/326-8703  

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