HTS-0010SD ,Ultra High Speed Hybird Track-and Hold AmplifiersGENERAL DESCRIPTION
The Analog Devices HTS-OOIO Track-and-Hold is another
example of Analog's c ..
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HTS-0010KD-HTS-0010SD
Ultra High Speed Hybird Track-and Hold Amplifiers
ANALOG
DEVICES
FEATURES
Aperture Jitter of 5ps
Acquisition Time 10ns
Output Current t40mA
Slew Rate 300V/ws
APPLICATIONS
Data Acquisition Systems
Radar Systems
Instrumentation Systems
Medical Electronics
GENERAL DESCRIPTION
The Analog Devices HTS-OOIO Track-and-Hold is another
example of Analog's continuing efforts to advance the state of
the art in high-speed circuits.
The HTS-0010 adds breadth to a line of devices which offers
designers the industry's widest range of track-and-hold and
sample-and-hold units.
Its pinouts are similar to its predecessor HTS-0025 track-and-hold,
but it provides enchanted performance in many of the charac-
teristics established by that device. Two pins which are unused
on the HTS-0025 are used on the HTS-OOIO, but with those
exceptions, the two devices have identical pin assignments. This
plug-in compatibility gives designers remarkable tlcxibility in
selecting those parameters which are optimum for their
applications.
Ultra High Speed Hybrid
sl,),,,!,,.!,),),,,!,!,,.!],),!,,,
i'i"t''Sr' 7 i't,,i'tej''c1fit'i,"il)
The HTS-OOIO track-and-hold (T/H) uses many of the proven
design concepts which have made the HTS-0025 T/ H the standard
of comparison for high-speed circuits of this type. A dc-coupled
Schottky diode bridge is driven by a high impedance buffer
amplifier and followed by a low impedance output amplifier to
achieve the best possible combination of speed and drive
capabilities.
All models of the HTS-OOIO are housed in a standard 24-pin
metal DIP. The unit operating over a temperature range of 0 to
+ 70°C is HTS-0010KD; the unit for a range of - 55°C to + 100°C
is HTS-0010SD; and the unit processed per MIL-STD 883,
Method 5008, is HTS-0010SD/883.
AUXILIARY
ANALOG SAMPLE ANALOG
INPUT 13 BRIDGE OUTPUT
CAPACITOR
HOLD BRIDGE ANALOG
COMMAND Ci, DMVER GROUND
ANALOG
GROUND GROU ND
Vcc - VEE
HTS-OO It Block Diagram
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.
vcc+ PWR PWR
GND GND
P.0. Box 280; Norwood, Massachusetts 02062 U.S.A.
wa: 710/394-6577
Cables: ANALOG NORWOODMASS
Tel :617/329-4700
Telex: 924491
SP ECI Fl CATI il NS (typigall ((1 , 25°C 1rltl, npmiqnalyower _sypplies unless. _tltltttwise noted) - 7 _ - - 7 _
ANALUG INPUT
Voltage Range
For Rated Performance
Maximum Without Damage
Impedance
Capacitance
Bias Current
bkiiALiNPtrrjcLcot/iratiblli Fre Tee
Mode Control
Hold Command Input
"O'' = Track
"l" = Hold
ANALOG OUTPUT
Current (Not Short Circuit Protected)
Impedance
Noise in Track Mode
61) S.OMHZ Bandwidth
DCACCURACY/STABILITY(FS = Full Scale)
Gain (No Load)1
Gain Nonlinearity; 2V FS Input
Gain Nonlinearity; 1V FS Input
Gain Temperature Coefficient
Initial Offset Voltage
Offset vs. Temperature
"TRACK (SAMPLE) MODE DYNAMICS
Frequency Response
Full Power Bandwidth
Small Signal( 3118) Bandwidth
Slew Rate
Harmonic Distortion (Track Mode;
4MHZ. 2V p-p Input)
R1,: lkft
RL - 500fl
R1,: 200n
R1. = 753.2
TRACK (SAMPI,E)-TO-HOLD SWITCHING
Effective Aperture Delay Timc2
Aperture Uncertainty (Jitter)
Offset Step (Pedestal)
Scnsitivily to Temperature
Sensitivity to - 5.2V
Switch Dclay'fimc
Switching Transient
Amplitude
Settling to lmV
HOLD MODE DYNAMICS
Droop Rate
Variation with "remperature4
Fecdthrough Rejection
(2V p-p Input)
((1 lMHz
m 10MHz
HOLD-TO-TRACK (SAMPLE) DYNAMICS'
Acquisition Time Q l V Step),
to t 1%
to l 0.1%
Acquisition Time (2V Step)
to A 1%
to t 0.1%
Switch Delay Time
Units,
pF max
“A max
mA max
fl (max)
pLV rms (max)
V/V (min)
o,(, max
ppm/T (max)
mV (max)
pV/"C (max)
MHz min
MHz min
V/Ps' (min)
dB max
dB max
dB max
dB max
ns (max)
ps (rms)max
mV (max)
M‘I/QC max
mV/V max
mV (max)
ns (max)
mV/ws max
dB min
dB min
ns (max)
ns (max)
ns (max)
ns(max)
HTS-OOIQKD
A 1.5to w 1.8
--0.8to - LI
20 (40)
0.96 (0.93)
30 (40)
t2(t5)
125(175)
300(250)
-2(tl)
;2(;10)
15(30)
HTS-WIFI.
’lltiX-l»
30 (50)
l>*i>*
Doubles' l 0°C Change
10(15)
14(19)
13(16)
16(22)
rs6iVEKii"ifiit) "ji'Mi' C
V+ (+ 15V t0.5V)
V- (- 15V :0.5V)
Vcc + (+ 5.0V t 0.25)
Vcc - (- 5.0V t 0.25)6
VEE( - 5.2V t 0.25)6
Power Dissipation
Power Supply Rejection Ratio7
(dc to 10kHz)
TEMPERATURE RANGE
Operating (Case)
Storage
THERMAL RESISTANCE8
Junction to Air, la (Free Air)
Junction to Case, (ch
Mean Time Between Failures
RL M 0.96
Ri. + 9
2Effective Aperture Delay Time is delay between
Hold strobe and held value ofanalog output,
referenced to analog input (see text).
5Pedestal temperature variation on HTS-00l0SD
is same as HTS-OOIOKD below + 70"C, but increases
between f 70°Cand + 100"C.
4Droop rate never exceeds 3mV/rus at + 70°C, nor
_l0mV/ws' at + 100T).
'Gain =
5 Foracquisitiontime measurements. = 20012;C, I 3pF.
.Pnits T HTS-OQWKD VTV HTS:OOIOSD
mA max 38 A
mA max 48 *
mA max 20 *
mA max 20 A
mA max 50 *
W max 1.75 *
mV/V max 10 *
T 0to+70 -55to+100
"C - 55 to f 125 V *
"C/W 42
°C/W 12
Hours 6.83 'X 105
6Va; - may be tied to V1.15 with adequate bypass capacitors
(see text).
7Variations in V - ( - 15V) have greater effect on
unit performance than variations in other supplies;
PSRR shown is for V -.
"Maximum junction temperature is + 150oC.
9Caicuiated for "/883" version using MI L-HNBK 217;
Ground; Fixed; 1 70°C case temperature.
'Specifications same as HTS-OO 1 OKD.
Specifications subject to change without notice.
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
t Tll/ll'''--]
0.175 MAX
0.25 0.018 t0.002 DIA
(6.3) (0.46 10.05)
0' "C'
. . 1.280
9 , 0 MAX
C) 4 (32.51)
0.090 0*;
(2.29) c,
331E291 ”'1 ' 0.090 (2.29)
0.1 (2.54) GRID
DOT ON TOP AND CERAMIC BEAD ON
BOTTOM INDICATE POSITION OF PIN 1.
PINS ARE GOLD PLATED.
PIN DESIGNATIONS
PIN FUNCTION
1 Vcc+ (+5V)
2 1 Vcc-(-5V)
_ v- (-15V)
4 VsE(-5.2V)
5 HOLDCOMMAND
_ s DIGITALGROUND
_ 7 POWERGROUND
8 V+ " 15V)
, Vcc+(+5V1
l Vcc-(-6VI
fl POWERGROUND
12 _ V- i-ISV)
l ANALOGINPUT
14 NIA
15 1 N/A
_ 16 N/A
- 17 N/A
13 _ ANALOGGROUND
7 It 1 VANALOGGROUND
H 20 " AUXILIARY HOLD
ill V POWERGROUND
22 7 V+(+15V)
23 MIA
24 KNALOG OUTPUT
POWER GROUND [PINS 7, 11 AND
21). ANALOG GROUND1PINS 18
AND 19). AND DIGITAL GROUND
(PIN 6) MUST BE CONNECTED TO-
GETHER AND TO A L0W-IMPED-
ANCE GROUND FOR PROPER 0P-
ERATION. MAKE CONNECTIONS
AS CLOSE TO DEVICE AS POSSIBLE.
HYBRID CASE IS CONNECTED TO
ANALOG GROUND INTERNALLY.
Applications
One of the main uses for track-and-hold CT/H) units is ahead of
analog-to-digital (A/ID) converters to allow digitizing signals with
bandwidths higher than the A/D can handle by itself, The use
of an appropriate T/H allows the converter to become a true
"Nyquist converter", i.e., capable of digitizing analog signals
whose maximum bandwidth is one-half the encoding rate.
The characteristics of the HTS-0010 T/H make it useful in
multiple other applications beside this "standard" use of devices
of this kind. It can be used in sample and hold circuits, peak
holding applications, simultaneous sampling A/Ds (with appro-
priate analog multiplexing), and for many other data processing
needs.
Refer to Figure l, HTS-0010 Interconnection Diagram.
AUXILIARY
M HOLD
SAMPLE
BRIDGE
ANALOG
ANALOG "
OUTPUT
INPUT 24
CAPACI [OR
HOLD 5 BRIDGE
COMMAND DRIVER
GNOU ND
Vcc+ Vur.” V“ Vn Ity
Figure I. HTS-0070 In terconnection Diagram
Bypass capacitors are used internally on all power supply leads
on the H'l'S-OOIO track-and-hold. External bypassing of all
power supplies with 0.0lwF--0.lwF ceramics will help perform-
ance. In addition, electrolytic capacitors of 10-22 microfarads on
each supply will also enhance the HTS-00l0's operation
A massive ground plane, careful component layout, and physically
separating analog and digital signals are among the other consid-
erations which can have major effects in improving the high-speed
characteristics of the HTS-OOIO track-and-hold,
As shown in Figure l, supply voltages must be applied to all
pins for which they are designated. In addition, it is extremely
important to connect all grounds together, and to a solid, low-
impedance ground plane. These connections must be made as
close to the hybrid as physically possible.
Five different voltages are shown for powering the HTS-0010.
These arc the voltages which are used in final test and calibration
and are the recommended voltages for best performance but
minor variations from these recommendations are possible.
For best performance, the amplifier supplies, Vcc- and Vcc+
should be equal and opposite, as shown. If desired, the ECL
logic supply (Vm; = - 5.2V) can be used also for kr- t to
eliminate the need for a separate power supply voltage. If it is,
bypass capacitors should be used at each supply pin to decrease
the possibility of logic switching noise introducing extraneous
signals.
TRACK-AND-HOLD MODE
When operated in the "track'' mode, the HTS-0010 T'I-I functions
as' a buffer amplifier, following all changes in analog input as
they occur. The user selects the point at which digitizing is to
be done by applying an external ECL-compatible HOLD
COMMAND to Pin 5.
Refer to Figure 2, Track/Hold Waveforms.
APERTURE UNCERTAINTY
- ("JITTER )
t IV 'APERTURE
ANALOG
-EFFECTIVE APERTURE DELAY TIME
mi: ff
HOLD ____m,
COMMAND - 'h swncn DELAY TIME _ _
TRANSIENT TRANSIENT
AMPLITUDE I SETTLING FEEDTHROUGH
Vrrp-p DROOP RATE = 's
ANALOG
OUTPUT
- IV ACQUISITION TIME
FOR tV OUTPUT l--
- g STEP TO SPECIFIED
SLEW RATE - At ACCURACY
Figure 2. Track/Hold Waveforms
A varying, ideal analog input is shown at the top of Figure 2 for
purposes of illustrating the response of the FrrS-0010 to various
types of inputs. This method of presentation helps show some
of the critical, and often misleading, parameters' of high-speed
track-and-hold devices.
During, the track mode, the unit operates as a high-speed buffer
amplifier, with the output following input changes as they occur.
In this mode, the response of the HTS-OOIO is limited primarily
by the slew rate characteristics of the deviee. As a result, the
analog output is a faithful reproduction of the input as long as
the highest frequency component of the input signal does not
exceed the bandwidth of the unit.
The analog output shown on the bottom of Figure 2 tracks the
input until a HOLD COMMAND is applied to Pin 5. When
this pulse arrives, the sample bridge of the HTS-OOIO disconnects
the hold capacitor from the input. The short, but finite, interval
required for this action is called aperture time.
Two other delay intervals combine with aperture time. One is
delay in the hold command caused by propagation delay in the
bridge driver; for purposes of discussion, this is a digital delay
(Id) because it is the time required for logic switching to occur.
The other is propagation delay through the input buffer amplifier,
which is an analog delay (Id) because it affects the analog input
signal being applied to the hold capacitor tsee HTS-OOIO Block Dia-
gram).
Each of these three components is critical in the design oftrack-and-
hold circuits, but the user needs to be conccrncd only with their
combined overall cffcct. The combination is specified here as
Effective Aperture Delay Time and is defined as the interval
between the leading edge of the hold command and that instant
when the input signal is equal to the held value.
Basically, effective aperture delay time is a measure of the dif-
ference between the analog and digital delay (tu-r/ and can
assume a zero, positive, or negative value depending upon the
comparative lengths of the two delays. In the HTS-0010, the
analog delay tta) is greater than the switching delay (tu), and
causes the unit to hold an input voltage which occurred before
the hold command because the hold capacitor sees a delayed
version of the input signal.
The specification for Effective Aperture Delay Time is a more
useful measurement for assessing T/H performance than is the
measurement of only aperture time because it includes all three
of the components which have an effect on how quickly the
device can make the change from the track mode to the hold
The time intervals discussed above help explain what happens
when the HTS-OOIO makes the change from the track mode to
the hold mode. In normal operation, however, they become
academic discussions since most users of the T/H are more
interested in when the held value has reached its steady state.
Aperture uncertainty or "jitter," is the result of noise signals of
various kinds which modulate the phase of the hold command.
This jitter shows up as a sample-to-sample variation in the value
of the analog signal which is being "frozen."
Aperture uncertainty manifests itself as an aperture error, as
shown in Figure 2. The amplitude of the error is related to the
dV/dt of the analog input. For any given value of aperture
uncertainty, aperture error will increase as the input dV/dt
increases.
The design characteristics of the HTS-OOIO insure that effective
aperture delay time is within its specification from unit to unit;
and is also repeatable from one "hold" command to the next
within any unit. Therefore, it should not be regarded as an
error source the way aperture uncertainty is. Effective aperture
delay time can be compensated with system timing which correctly
establishes the beginning of the hold period.
Referring again to Figure 2, a switching transient appears in the
analog output as a result of this transition from "track" to "hold."
The Specifications table includes the maximum amplitude and
duration of this transient; and also includes information on the
switch delay time which precedes it. The held output is settled
to within lmV 6-15ns after the leading edge of the hold signal.
Feedthrough rejection is a measure of the amount of leakage
from input to output during the hold interval after the HTS-OOIO
has settled to its specified accuracy. High feedthrough rejection
is important because it assures no errors will be introduced
during the conversion interval of the converter used at the output
of the T/H.
In the illustration, Vr,-r is the small amount of "ripple" voltage
on the held value of analog output. The ratio of output feedthrough
to input signal is measured in dB and is equal to:
Vrn, F,',']
20 log F:, p-p
As shown, droop is that amount of change in the analog output
which occurs during the hold interval. Improving (lessening) the
droop rate can be accomplished by adding capacitance in parallel
with the internal hold capacitor, but at the expense of slowing
down the T/H and its ability to handle high-speed signals.
Applications which require longer hold times than the standard
HT S-0010 provides may require external capacitance in parallel
with the internal hold capacitor. For these, the user can parallel
extra capacitance by connecting it between pin 20 and ground.
The droop rate will be improved, but the overall speed and
bandwidth of the T/H will be reduced. This extra connection
should be made close to the hybrid case or it may introduce
small amounts of electrical noise.
Switch delay time shown in Figure 2 is the interval between the
end of the hold command and the start of movement in the
analog output as it begins to retrack the analog input. This
delay occurs at both the beginning and the end of the hold
interval and is primarily the result of propagation delay through
the output buffer amplifier,
Acquisition time is the time required for the output of the T/H
t0 reacquire and begin tracking accurately the analog input after
the T/H has returned to the "track'' mode. The acquisition time
"clock" starts when the output begins moving and stops when
the output has settled to its specified accuracy. As might be
expected, longer acquisition times are required for larger signals
and/or greater accuracy.
High slew rates are also important during acquisition time, but
the desire for speed must be tempered with practical consider-
ations. If the design of the unit achieves only speed without
regard for overshoot, the acquisition time will be lengthened.
Excessive "ringing" around the signal being acquired precludes
applying successive hold commands at MHz update rates.
SAMPLE-AND-HOLD (S/H) MODE
Although generally used in the track-and-hold mode, the HTS-
0010 can also be used as a sample-and-hold device for applications
where this capability is needed.
The operation of the unit is essentially a "mirror" of the T/H
operation, in that the output is usually in the "hold" mode but
is switched to the "sample" (track) mode for brief intervals.
The width of the sample pulse which is used will be based on
factors which are different for each application. Basically, the
user establishes the width of this pulse by taking into account:
l. The acquisition time of the HTS-OOIO.
2. The desired accuracy of the sampled output.
3. The maximum amount of change which has occurred since
the preceding sample.
This latter phenomenon is illustrated in Figure 3 Sample/Hold
Operation.
ANALOG
COMMAND
SAMPLE
(TRACK) l
ANALOG
OUTPUT
______[:.____
__e_____l:___
Figure 3. Sample/Hold Operation
When operating as a S/H, the signal applied to the HOLD
COMMAND input (Pin 5) is usually a digital logic "I" which
holds the HIS-0010 output at the input value present at the
time of the sample/hold pulse.
Figure 3 shows asynchronous pulses applied to cause the output
to reslew to new values. The trailing edge establishes the sample
(track) mode; the leading edge returns the output to "hold''.
In Figure 3, the analog input applied to the unit has changed
drastically between the first and second sample (track) pulses.
Smaller differences in the input values are present at the times
of the second and third pulses. These differences in input show
