AD389BD ,HIGH RESOLUTION TRACK-AND-HOLD AMPLIFIERFEATURES
Companion to Hi h Resolution AID Converters
Fast Acquisition Tim 2.5us to :0.003%
L ..
AD389KD ,HIGH RESOLUTION TRACK-AND-HOLD AMPLIFIERapplications,
The fast acquisition time (2dws m 300w) and low aperture
jitter (wops) make it suit ..
AD390JD ,Quad 12-Bit Microprocessor-Compatible D/A ConverterANALOG
DEVICES
AD390KD ,Quad 12-Bit Microprocessor-Compatible D/A Convertercharacteristics (20ppm/''C) and an initial tolerance
of I 0.03% maximum. The internal reference bu ..
AD390SD ,Quad 12-Bit Microprocessor-Compatible D/A Converterspecifications appear in Table 2.
’The AD390 outputs Ire guaranteed stable for load capaciunces ..
AD390TD ,Quad 12-Bit Microprocessor-Compatible D/A ConverterFEATURES
Four Complete 12-Bit DACs in One IC Package
Linearity Error t 1/2LSB Tm... - T,,,.,, ..
AD8574ARU ,Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational AmplifiersFEATURESLow Offset Voltage: 1 mV8-Lead MSOP 8-Lead SOICInput Offset Drift: 0.005 mV/8C(RM Suffix) ( ..
AD8574ARU ,Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational AmplifiersCHARACTERISTICSOutput Voltage High V R = 100 kW to GND 4.99 4.998 VOH L–40
AD389BD-AD389KD
HIGH RESOLUTION TRACK-AND-HOLD AMPLIFIER
ANALOG
DEVICES
FEATURES
Companion to High Resolution AID Converters
Fast Acquisition Time: 2.5p.s to :0.003%
Low Droop Rate: 0.1pV/p.s
Aperture Jitter: 400ps
Internal Hold Capacitor
Unity Gain Inverter
Low Power Dissipation: 300mW
PRODUCT DESCRIPTION
The AD389 is a high accuracy, adjustment free track-and-hold
amplifier designed for high resolution data acquisition applications.
The fast acquisition time (2.Sp.s to 300wV) and low aperture
jitter (400ps) make it suitable for use with fast A/D converters
to digitize signals up to 40kHz.
The AD389 is complete with an internal hold capacitor and it
incorporates a compensation network which minimizes the sample
to hold charge offset.
Typical applications for the AD389 include sampled data systems,
peak hold functions, strobed measurement systems and simul-
taneous sampling converter systems. When used with autozero
and autocalibration techniques, this T/H combined with a high
linearity A/D will offer 14-bit performance over the converter's
full no-missing-code temperature range.
The device is available in two versions: the "K" specified for
operation over the 0 to + 70°C commercial temperature range
and the "B'' specified over the full industrial temperature range,
-25''C to + 85°C. High reliability processing available; contact
factory for information.
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 implica-
tion or otherwise under any patent or patent rights of Analog Devices.
High Resolution
Traeli-tmd4lold Amplifier
PRODUCT HIGHLIGHTS
1. The AD389 is the ideal companion track-and-hold amplifier
to l4-bit accurate A/D converters.
2. The AD389 provides separate analog and digital grounds,
thus improving the device's immunity to ground and switching
transients.
3. The droop rate is only 0.lwV/ws so that it may be used in
slower high resolution systems without the loss of accuracy.
4. The fast acquisition time and low aperture make it suitable
for high speed data acquisition systems and digital audio re-
cording.
S. The AD389 T/H amplifier is ideal for applications requiring
wide dynamic range.
6. Clever circuit design eliminates any measurable thermal tail
(see Figures 11a and 11b).
Two Technology Way; Norwood, MA 02062-9106 U.S.A.
Tel: 617/329-4700 Twx: 710/394-6577
Telex: 174059 Cables: ANALOG NORWOODMASS
S P E c I F I CATI il N s (typical @ + 25'T and nominal power supply voltage of t 15ll unless otherwise noted)
Model AD389KD AD389BD UNITS
ANALOG INPUT
Voltage Range t 10 min A V
Overvoltage, no damage t 15 max * V
Impedance 3000 A n
DIGITAL 1NPUT(TTL Compatible)
Track Mode, Logic "l" 2 to 5.5V * V
Hold Mode, Logic "o" 0 to 0.8V * V
Logic " 1 " Current 20 * pA
Logic "o'' Current 360 . wA
ANALOG OUTPUT
Voltage t 10 min * V
Current 3 * mA
Short Circuit Current 20 * mA
Impedance 1 * n
DC ACCURACY/STABILITY
Gain - 1.00 * NN
Gain Error t 0.01 ( t 0.02 max) * %
Gain Nonlinearity ( t 10V Output Track) t 0.001 * %
Gain Temperature Coefficient 1 (5 max) * ppm/°C
Offset Voltage t 3 max, adjustable to zero * mV
Output Offset C4 Tmin, Tmax (Track) t 6 * mV
TRACK MODE DYNAMICS
Frequency Response
Small Signal ( - MB) 1.5 * MHz
Full Power Bandwidth 0.5 * MHz
Slew Rate 30 * V/us
Noise in Track Mode, dc to 1.0MHz 200 * p.V rms
TRACK-TO-HOLD SWITCHING
Aperture Time 30 * ns
Aperture Uncertainty (Jitter) 0.4 * ns
Offset Step (Pedestal) t 2 (4 max) * mV
Pedestal with Temperature t 4 t 6 mV
Switching Transient
Amplitude 200 . mV
Settling to lmV 0.5 (2 max) * us
Settling to 0. 3mV 1.0 (3 max) * p.s
HOLD MODE DYNAMICS
Droop Rate 0.1 (1 max) * WV/ws
Droop Rate at Tmax 10 max 40 max pV/us
Feedthrough Rejection (10V p-p Cr) 20kHz) 86 (74 min) * dB
HOLD-TO-TRACK DYNAMICS
Acquisition Time to t 0.01% of 20V 1.5 (3 max) * us
Acquisition Time to t 0.003% of 20V 2.5 (5 max) * us
POWER REQUIREMENTS
Nominal Voltages for Rated Performance t 15 ( , 3%) V
Operating Range' , 11 to t 18 V
Power Supply Rejection 100 wV/V
Supply Current
+ Vs 15 (20 max) * mA
- Vs - 4 (10 max) * mA
Power Dissipation 300 (500 max) * mW
TEMPERATURE RANGE
Operating 0 to + 70 - 25 to + 85 'C
Storage - 55 to + 125 * T
THERMAL RESISTANCE
Junction to Air, Oia (free air) 60 'C/W
Junction to Case, Bic 20 "C/W
'Operating to dented performance with Nml
'Specifications same " AD389KD.
Srmcirications subject to change without notice.
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
r.----- -
0.800 (20.32)
t'lRydbfsa3s1/---1
I I 0.785 (19.939)
itdhU22SMl C. 485 (2 313)
0.480 (12.192) o, 505 (12. 827)
l ff ,
-3930 -r,
1 .762
MAX’ il 33514353)
0.215 (5.461)
PLANE N
SEATING -t-
PLANE I - -...-.._.._.._.._ -TT
GAUGE 093010.762)
1,,,r,j,laiael,-,a,) 'l L-s,,,,),-),)),'
0M5111431W
0020 0. 508
l it1Reddf, 105 (2. 667)
l. 16514 121)
f 185 t4, 699)
0.100 (2.54)
11.999.82.229)
t 0.1112 (0.305)
"t')u....a,..-......,rt
031017.874)
PIN CONFIGURATION
DIGITAL INPUT 1 o CEI -15v
NIC [E E] ANALOG INPUT
MO I: AD389 SUMMING PT
DIGITAL GND 7 'flt,)1EJ' E +15V
N/C E Scaul Eiil N/C
E] OFFSET ADJ
ANALOG GND I 6
OFFSET AD.) I 7 8 I ANALOG OUTPUT
FUNCTIONAL BLOCK DIAGRAM
ANALOG
GROUND
GROUND
CONTROL
TRACK/HOLD
LOGIC INPUT
ORDERING GUIDE
Temperature
Model Range
AD389KD 0 to + 70°C
AD389BD - 25°C to + 85°C
2‘s 7 2
10V STEP
2 STEP
., 20V ,
I 10V I ERROR BAND
i 1.5 g q I
SV 2 -4
if a a tl
D I 5 w
g o ik
< 3 2 ck=zopr
0 D .-2
o , 2 , l 5 -50 -25 0 25 Mt 75 100 T25 -10 -5 0 5 IO
, ERROR BAND - mV TEMPERATURE - 'C INPUT _ v
Figure I. Acquisition Time VS. Figure 2. Acquisition Time vs. Figure 3. Pedestal vs. Input
Final Error Band Temperature Voltage
WOO 6 2
. > > ,
t 10 , ,
on -0.5
001 .1
0 25 50 75 too 125 -50 -25 D 25 50 75 100 t25 0 10 20 30 40 50 60
TEMPERATURE A c TEMPERATURE - 'c LOAD CAPACIYOR - pF
Figure 4. Droop Rate vs. Figure 5. Pedestal vs. Temperature Figure 6. Pedestal vs. Load
Temperature Capacitor
-tSV .15v
SOpF snpr
'''AC',1-
VOUT HOLD
VOLTAGE "
ANALOG INPUT
TRACK t
ERROR VOLTAGE
Hill TO 7AI3 PLUG-IN
CLAMPING AMPLIFIER
Figure 7. Hold to Track Acquisition Time Figure 8. Pedestal and Acquisition Time Test Circuit
TERMINOLOGY
Aperture Time is the time required after the "hold" command
until the switch is fully open and it produces a delay in the
effective sampling timing.
Aperturefitter is the uncertainty in Aperture Time. If the Aperture
Time is "tuned out'' by advancing the track-to-hold command
with respect to the input signal, the Aperture Jitter now determines
the maximum sampling frequency.
Acquisition Time is the time required by the device to reach its
final value within a given error hand after the track command
has been given. This includes switch delay time, slewing time
and settling time for a given output voltage change.
Droop is the change in the output voltage from the "held" value
as a result of device leakage.
r - -', V. r- - - - A “I
_ HOLD/SAMPLE DE AY
SETYLING / rfrimmnoucn i L
TIME Vo I J’I -
I l ----- ---- SLEW RATE
, ----
l LIMITED
, A)- APERTURE I
ACOU ISI YION
APERTURE TIME
TRACK TRACK
LOGIC INPUT
Figure 9. Pictorial Showing Various T/H Characteristics
