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Hold Amplifier. AD346 Datasheet

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Hold Amplifier. AD346 Datasheet
















AD346 Amplifier. Datasheet pdf. Equivalent













Part

AD346

Description

High Speed Sample and Hold Amplifier



Feature


ANALOGDEVICES fAX-ON-DEHAND HOTLINE - Pa ge 111 -. ANALOG W DEVICES HighSpeed S ample-and- Hold Amplifier I AD346 I F EATURES FUNCTIONAL BLOCK DIAGRAM Fast 2.0fLSAcquisition Time to :0.01% Low D roop Rate: O.5mV/ms Low Offset Low Glit ch: <40mV Aperture Jitter: 4OOps Exten ded Temperature Range: -55"C to + 125.C Internal Hold Capacitor MIL-STD-883BPr ocessing Available.
Manufacture

Analog Devices

Datasheet
Download AD346 Datasheet


Analog Devices AD346

AD346; +vs 8) ~~~t~ S)~~~LOG OBPRODUCT DES CRIPTION The AD346 is a high speed (2J. lSto 0.01%), adiustmem free Ssample-and -hold amplifier designed for high throu ghput rate Odata acquisition applicatio ns. The fast acquisition time (211s(0 0 .01%) and low aperture jitter (400ps) m ake it suitable for use Lwith fast AID converters to digitize signals up to 97 kHz. EThe AD346 is.


Analog Devices AD346

complete with an internal hold capacito r and it incorporates a compensation ne twork which minimizes the sample Tto ho ld charge offset. The AD346 is also las er trimmed to eliminate Ethe need for e xternal trimming potentiometers. PRODU CT HIGHLIGHTS 1. The AD34 .


Analog Devices AD346

.





Part

AD346

Description

High Speed Sample and Hold Amplifier



Feature


ANALOGDEVICES fAX-ON-DEHAND HOTLINE - Pa ge 111 -. ANALOG W DEVICES HighSpeed S ample-and- Hold Amplifier I AD346 I F EATURES FUNCTIONAL BLOCK DIAGRAM Fast 2.0fLSAcquisition Time to :0.01% Low D roop Rate: O.5mV/ms Low Offset Low Glit ch: <40mV Aperture Jitter: 4OOps Exten ded Temperature Range: -55"C to + 125.C Internal Hold Capacitor MIL-STD-883BPr ocessing Available.
Manufacture

Analog Devices

Datasheet
Download AD346 Datasheet




 AD346
ANALOGDEVICES fAX-ON-DEHAND HOTLINE - Page 111
-. ANALOG
W DEVICES
HighSpeed
Sample-and- Hold Amplifier
I AD346 I
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Fast 2.0fLSAcquisition Time to :0.01%
Low Droop Rate: O.5mV/ms
Low Offset
Low Glitch: <40mV
Aperture Jitter: 4OOps
Extended Temperature Range: -55"C to + 125.C
Internal Hold Capacitor
MIL-STD-883BProcessing Available
+vs
8) ~~~t~
S)~~~LOG
OBPRODUCT DESCRIPTION
The AD346 is a high speed (2J.lSto 0.01%), adiustmem free
Ssample-and-hold amplifier designed for high throughput rate
Odata acquisition applications. The fast acquisition time (211s(0
0.01%) and low aperture jitter (400ps) make it suitable for use
Lwith fast AID converters to digitize signals up to 97kHz.
EThe AD346 is complete with an internal hold capacitor and it
incorporates a compensation network which minimizes the sample
Tto hold charge offset. The AD346 is also laser trimmed to eliminate
Ethe need for external trimming potentiometers.
PRODUCT HIGHLIGHTS
1. The AD346 is an improved second source for other sample
and holds of the same pin configuration.
2. The AD346 provides separate analog and digital grounds,
thus improving the device's immunity to ground and switching
transients.
3. The droop rate is only O.SmV/ms so that it may be used in
slower high accuracy systems without the loss of accuracy.
4. The fast acquisition time and low aperture make it suitable
for very high speed data acquisition systems.
Typical applications for the AD346 include sampled data systems,
D/A deglitchers, peak hold functions, strobcd measurement
systems and simultaneous sampling converter systems.
PIN CONFIGURATION
The device is available in tWo versions: the "J" specified for
operation over the 0 to + 700C commercial temperature range
and the "S" specified over the extended temperature range,
- 55°C to + 125°C.
13 I ANAlOG INPUT
ORDERING GUIDE
MocIcl
AD 346JD
AD346SD
AD346SD/883B
*DH-14A = Ceramic DIP.
Temperature
Range
Oto +700C
- 55°to + 125°C
- SSOC'to+ J2S.C
Package
Option.
DH-14A
DH-14A
DH-14A
DlGrrAL OND I .
ANAlOG GND L.!
r7OFFSET AOJ
!J OFFSET AOJ
81 ANALOG OUTPUT
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 licer\$e 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; 6171326-8703
Twx: 710(354-6577
Telex: 924491
Cable: ANALOGNORWOODMASS




 AD346
-ANALOGDEVICES fAX-ON-DEMAND HOTLINE
Page 11
AD346-SPECIFICATIONS =(typical @ +25°C, Vs :t15Y unlessotherwisenoted)
Model
AD 346JD
AD346SD
Units
ANALOG INPUT
Voltage Range
Input Impedance
:!:1O.0
3.0
*
*
Volts
kO
DIGITAL INPUT
"0" Input Threshold Voltage (Hold)
"1" Input Current
"0" Input Current
"I" Input Current
+O.8max
2.0min
- 360JLA(max)
20JLA(max)
*
*
*
*
Volts
Volts
JLA
JLA
TRANSFER CHARACTERISTICS
Gain
-1.0 '"
VN
Gain Error
-Gain Error, T miD T max
Offset Voltage
:!:0: .02 max (:!:0.01 typ)
:!::O.05 max( :to.O3 typ)
:!::3max(:t ltyp)
'"
*
'"
%FSR
%FSR
mV
Offset Voltage, Tmin- T max
Pedestal
-Pedestal, T miD T""'"
Droop Rate
-Droop Rate, T min Tmu:
DYNAMIC CHARACTERISTICS
Full Power Bandwidth
OVour= +lOV, -3dB
BOutput SlewRate
Acquisition Time
STo :!::O.OI%10VStep
To :!::0.01%20V Step
OApertU1'e Delay
Aperture Jitter
LSettling Time
ESample Mode (10V Step)
Sample to Hold
TFeedthrough (Hold Mode)
Eat 1kHz
:!::20max(:!:6 typ)
:!::4max(:t2ryp)
:!::20max(:t8typ)
O.Smax(O.l ryp)
60 max (20 typ)
1.4
50
Z.Omax (1.0 typ)
2.5max(1.6typ)
60 max (30 ryp)
0.4
2.0max(1.0typ)
SOO
0.02 max (0.005 typ)
*
*
*:t20max(:!: 10typ)
650 max (200 typ)
*
*
*
*
*
*
*
*
'"
mV
mV
mV
mV/ms
mV/ms
MHz
V/JLS
IJ.S
IJ.S
os
ns
IJ.S
ns
%FSR
Transient Peak Amplitude
Sample/Hold/Sample
40
*
mV
ANALOG OUTPUT
Output Voltage Swing I
Output Current
:!:IO.Omin
3.0
*
'"
Volts
mA
POWER REQUIREMENTS
Operating Voltage Range
Supply Current
+V
-V
Power Supply Rejection Ratio
Power Consumption
:t lZto:!: 18
18max (9 typ)
-lOmax(-3typ)
100
500 max(ZOOtyp)
*
'"
*
*
*
Volts
mA
mA
JLVN
mW
NOTES
'Maximum outpUt swing is 4V less tban + Vs.
*Specifications same as AD346JD.
Specifications subject to change without notice.
-2- REV. A




 AD346
-ANALOGDEVICES fAX-ON-DEMAND HOTLINE
Page 12
AD346
3.2
%.II
ziU 2.0
~
~u
8 1.Z
0(
0.8
0.4
0
0
------------
+5
- 0.01"f$R
--......L
0
5IH
OFFSET
--- INMV
.......0...1.%. FSR
5 10
OUTPUT VOLTAGE SWING
1
15
20 -55 -25
0 +25
TEMPERATURE - "C
+10
+125
Figure 1. Acquisition Time vs. Output Voltage
Figure 3. S/H Offset Drift (Typical)
4.0
3.5
3.2
iu
O~ U
i:I 2.0
~ B1.6
S1.2
0.1
O0..4
L0
E-II
-V Input "'SV
-25 0 +25
+10
-TEMPERATUIIf "C
0.01%FSR
I
0.1 F$R
,
+1211
TEFigure 2. Acquisition Time vs. Temperature
460
405
360
~ 315
~ 210
i!:225
B 180
Q
135
110
45
0
-55
-111
0 +25
TEMPERATURE - "C
J
I
I
I
I
/
./
/'
+70 +125
Figue 4. Droop vs. Temperature (;1:5 Volts)
GROUNDING
Many data-acquisition components have two or more ground
pins which are not connected together within the device. These
"grounds" are usually referred to as the Logic Power Return,
Analog Common (Analog Power Return), and Analog Signal
Ground. These grounds must be tied together at one point,
usually at the system power-supply ground. Ideally, a single
solid ground would be desirable. However, since current flows
through the ground wires and etch stripes of the circuit cards,
and since these paths have resistance and inductancc, hundreds
of millivolts can be generated between the system ground point
and the ground pins of tbe AD346. Separate ground retUrns
should be provided to minimize the current flow in the path
from sensitive points to the system ground point. In this way
supply currents and logic-gate return currents are not summed
into the same return path as analog signals where tbey would
cause measurement errors.
AD ADC8S
SIGNAL
GROUND
'If INDEPENDENT, OTHERWISE
RETURN AM~LIFI~II REf£A~NCE
TO MECCAAT ANALOG P.S. COMMON
Figure 5. Basic Grounding Practice
DIGITAL
DATA
OUTPUT
REV,A
-3-




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