HTC-0300AM ,Ultrahigh-Speed Hybrid Track-and-Hold Amplifiersapplications, including
waveform measurements, analog signal delay, and signal
sampling.
The u ..
HTC0603-1E-R30-T35 , HTC series, high-precision, thin-film chip capacitors.
HTF3226LF , TEMPERATURE AND HUMIDITY MODULE
HTIP127 ,Sincerity Mocroelectronics - PNP EPITAXIAL PLANAR TRANSISTOR
HTIP31C ,Sincerity Mocroelectronics - NPN EPITAXIAL PLANAR TRANSISTOR
HTP4A60S , NON INSULATED TYPE SENSITIVE GATE TRIAC (TO-220 PACKAGE)
ICL232 ,RS-232 Transceiver, 2T/2R, +5V, 120kbpsApplicationsICL232lPE -40 to 85 16 Ld PDIP E16.3• Any System Requiring RS-232 Communications Port- ..
ICL232CBE ,+5V Powered, Dual RS-232 Transmitter/ReceiverTMICL232June 2001 +5V Powered, Dual RS-232 Transmitter/Receiver
ICL232CBET , 5V Powered, Dual RS-232 Transmitter/Receiver
ICL232CBEZT , 5V Powered, Dual RS-232 Transmitter/Receiver
ICL232CPE ,+5V Powered, Dual RS-232 Transmitter/ReceiverTMICL232June 2001 +5V Powered, Dual RS-232 Transmitter/Receiver
ICL232IBE , 5V Powered, Dual RS-232 Transmitter/Receiver
HTC-0300A-HTC-0300AM
Ultrahigh-Speed Hybrid Track-and-Hold Amplifiers
|> ANALOG
" DEVICES,
FEATURES
Aperture Jitter of 50ps
Input Range t.101f
Output Current t50mA
Max Droop Rate 5p.V/p.s
Max 200ns Acquisition Time (0.01%; 10V Step)
APPLICATIONS
Data Acquisition Systems
Peak Measurement Systems
Simultaneous Sample & Hold
Analog Delay
GENERAL DESCRIPTION
The HTC-0300A is a hybrid microcircuit track-and-hold amplifier
useful in a wide range of signal processing applications, including
waveform measurements, analog signal delay, and signal
sampling.
The unit has a typical aperture jitter of only 50 picoseconds
rms; wide dynamic input range of t 10 volts; and laser-trimmed
gain and offset which preclude a need for external adjustments.
Its speed and precision are the result of innovative design tech-
niques using a high-speed op amp and DMOSFET switches.
These techniques also enhance device performance in feedthrough
rejection, linearity, harmonic distortion, droop rate, and output
voltage swing.
illtrahigh-Speed Hybrid
Track-and-ale Amplifiers
ORDERING INFORMATION
For a case temperature range of -25°C to + 85°C, order the
HTC-0300A; it is packaged in a 24-pin hermetically-sealed ceramic
A military case temperature range of - 55°C to + 125°C is available
with the HTC-0300AM, HTC-0300AM/883B, and the HTC-
0300ATD/883B. The first two units are housed in M-pin metal
packages, and the latter unit is packaged in a hermetic 24-pin
ceramic DIP.
All versions of the HTC-0300A are manufactured in a facility
which has been certified to MIL-STD-l772.
HTC-03OOA
ANALOG "
HOLD CAPACITOR
SAMPLE
GROUND
BRIDGE f
ANALOG
V OUTPUT
ULTRAFAST
COMMAND
GROUND
DRIVER
1k OPAMP
ro) GROUND
+15V -15V +5V
GROUND
NOTES: WHEN APPLYING HOLD COMMAND TO PIN TI, CONNECT
HOLD COMMANDjPlN 12) TO GROUND.
WHEN APPLYING HOLD COMMAND TO PIN 12. CONNECT
HOLD COMMAND (PIN “HO ' 5V,
Functional Block Diagram
Iniormatiori 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.
One Technology Way; P. 0. Box 9106; Norwood, MA 02062-9106 U.S.A.
Tel: 8173294700 wa: 710884-6577
Telex: 174059 Cables: ANALOG NORWOODMASS
SPEC I Fl CATI tl NS (Typical with nominal supplies, unless otherwise noted)
OUTLINE DIMENSIONS
- SS‘C to + IZS'C Temp.
"1'l2llifdP"" "lll,'filllltlihy Dimensions shown In inches and (mm).
Parametetu(Conditinns) Group Temp. Min Trp Max Min Trp Max Units HTC-O3OOA and HTtMB00ATD/883B
ANALOG INPUT 1295 £0315
(F5 = Full Scale = IOV; [32.09 20.301)
FSR - FulMicale Range - 20V)
a Voltage Range + 25'c , 10 t I0 v ESO s"'i'flg'h'/il' IMt50 ttart TYP
I overvoltage,No Damage + ZS'C t IS s IS V DENOTE pm N0 , _L
J Input lmpcdanccwm= IOV; I.2, 3 Full 950 I000 I050 950 I000 1050 tt 0.150 :0020
Pins I l & 12 5 "tr') (4.06 20.50!)
0 Initial Offset Voltage I + ZS'C 2 0.5 t S.0 1 05 , 5.0 mV
(v... = ow, Pins I I & I2 = "o'') I313: 1tl'lt CI' mm
DIGITAL INPUT MODE te, o b
0.040 . " .100 , .
(ggmggm, "+sz "WP .s.W.°::.
J Logic“0" Input Voltage I, I, ' Full 0.0 0.0 0.8 V t ‘00 e0 005
/ Logic"0”lnpulCurr¢m I,2 +25'C/ _ LO ' Lo gm (1).” Iiriih
+ 125T
I Lsgic"0"lrtputCurrent -55''C , Lo t LO wh
J Logic"l" Input Voltage I.2. , Full 2.0 5.5 2.0 v 0.230 s0.0TO
J Logicm" InputCurrent I.2 + 25‘C/ t m - 1.0 " I‘_Izo.os 20254»
+ 125'C
' Lmic''0''tnputCurrmtt - SS’C . 1.0 - l.0 wA
ANALOG OUTPUT
' Voltage +251; 4 IO .10 V - - 0.010 20.002
' Current I“ 0.500 10.010 "l
(Not Short Circuit Protected) + 25‘c t so t 50 mA "5.26 , 0.254t
a lmpedmc: +25-c 0.I I.0 0.1 I.o n
Capacitive Load (See text) + 2St 250 250 pF
. NoiseinTrack Mode' ' 25'C HTGO3OOAM and HTcuB00AM/883B
dclo 100KHa IS IS uV rm:
dc to [MHz 34 34 uV rms
dc to SM": 0. I 0.I mV rms -',ti-1i',-yiil-'n'
DC ACCURACY/STABILITY Estt SYMBOL ON top
a Gain + we - l.0 - I.o " DENOT" pm NO ,
j GainError l +25‘C 20.05 '0.1 t0.05 20.] % -o o o o o o o o o o o o
2, 3 Full t ms 7. 1
J Gain Nonlinearity I + 25c t0.005 , th01 , 0.005 - 0.0I v.
2, 3 Full - 0.01 y, 0500 0.765 IIQJJI)
J Gain TemperatureCoemciettt 2, 3 Full , 0.5 4 ' , 0.5 . 5 ppm Fsrc “52" th380 “9"
/ Input0iTset
Temperatur/cies 2,3 Full t3 ‘IS :3 tlS ymeSR/"C o o o o o o o o o o o o
TRACK (SAMPLE) MODE l
:YNAMICS F- 0355 (3.tt37)
"quency Response 0.090 triist-a.iiri
(VIN: 1Vp.p;Pins ll& l2:“0") (220)
J Small Signal ( - MB) 4 + 25'C 8 l6 s 16 MHz
Full Powcr( - MB) + 25'C 8 8 MHz I
J Slew Rate (Vo: - Iov p-p; 4 + 2% 220 300 220 300 ' ,
PinsH8ri2-"0'') 5.6 Full 180 300 Inc 300 V/ws tNtlr-/, H ll I I I u H H H H
I Harmonic Distortion' + 25'C 80 80 dB
TRACK (SAMPLEhTomOLD f L, 2.
DYNAMICS -
f ApertureTime are 4 o s 4 6 s m 335% tgt/Pe)
Aperture Uncertainty (Jitter) + ZS'C 50 50 ps, rms
J Pmirstai(OfTset Step) 4 + 25'c - 2.5 ' 20 - 2.5 _ 20 mV
/ Pedestal Temp. Cocff. 5,6 Full at 8 ppm FMC
' Pedestal Sensitivity
lo ' 5V Supply Changes - 25T , S mVN
SwitchingTransieat
/ Amplitude 4 ' 25'C ISO 380 180 380 mV p-p
s, 6 Full 180 330 180 330 mV p~p L
/ SeulistgTime 059994159311
To 0.1% 7 . 25c 40 " 40 85 ns 0.090(2186)
To 0. m 3 Full 40 " 40 " us
To0.01% 7 425°C 60 I00 60 I00 "
T00.0l% 8 Full 60 I00 60 I00 m
HOLD MODE DYNAMICS PIN ESIGNATIONS
J Droop Rate 4 ' 25'C t 0.5 , 5 , 0.5 , u V/ws (As viewed from bottom)
, + IZS'C , " mles
6 - we 5 “w.”
J Feedthrough Rcicction 7 ' 25‘c 64 " 64 " an PIN FUNCTION PIN FUNCTION
(vm-zov p-pCtp2.5MHz) 24 + ISV 1 ANALOG OUTPUT
H0LD(SAMPLEVrtNTRACK 23 POWER GROUND 2 N/A
DYNAMICS 22 - IW 3 MIA
J Acquisition Timetath1% 7 ' 25'C I00 I70 100 170 ns 21 GROUND 4 N/A
(iOV p-p Step) 8 Full 100 I70 I00 I70 ns 20 N/A 5 NIA
J Acquisition Timeto0.01% 7 ' 25'c 160 200 160 200 n: " MA 6 N/A
(10V p-p Step) ' Full 160 200 I60 200 m I' '/lt g It
AcquisitionTime tothi% +25'C 110 110 ns 16 NIA 9 +5V
(20Y W Step) 15 INPUT GROUND to LOGIC GROUND
" MIA 11 LLt.1.Lt2 COMMAND
" ANALOG INPUT " HOLD COMMAND
- SS'C to + IZS'C Temp.
-2S'Ctoo8SNyremp. mwm, ABSOLUTE MAXIMUM RATINGS
HTC-OJDOA ATD/883BAhMG3B Supply Voltages
Sub. t VS ............... Lt 18V
Parameter"’(Conditions) Group Temp. Min Trp Max Min Trp Max Units Vac ............. - 0.5, + 7V
POWER REQUIREMENTS toraee Temperature - 65°C to + l50°C
Supply Voltages Junctfon Temperature . . + 150°C (A & AM)
tVs 125'!) , ".25 , IS :15.75 1 14.25 :15 :15.75 V Junction Temperature
Vcc(Lw'c Supply) + 25'C o 4.75 _ sn ' 5.25 + 4.75 + 5.0 ' 5.25 V .......... + 165°C (/883B units)
SUIEPIY ft'11s/l),'; - 0V; Lead Soldering (lOsec) ...... + 300°C
insll 12-' " Di itall _
. _.-. vs I + 25'C - 21 t 25 t 21 s 25 mA A31: Inputs ........ o.sv ttt V0:
2,3 Full +21 -25 ‘21 +25 mA g ttput .'.......... t IW
b Vu;{Logic Supply) l + 25°C +4 ' 5 +4 +5 mA
2,3 Full +4 '5 _ 4 t , mA Explanation of Group A Military Subgroups
/ Power Dissipation l + 25'C 650 775 650 775 mW
2, , Full 650 775 650 775 mW Subgroup l - Static tests It +25‘C.
d ' Vs POWER SUPPLY (10% PDA calculated Igzinxt Subgroup l for high-rel versions)
REJECTION RATIO(PSSR) I ' 25"C - 0.3 r 0.5 s 0.3 20.5 mVN Subgroup 2 - Static tests It maximum rated temmture.
(Vue 10V;Pins ll & 12 = "0") 2, , Full . on , 0.5 - 0,3 0.5 mVN Subgroup ' - Static tests ll minimum rated temperatum.
_ . Subgroup 4 - Dynamic test: It + 25'C.
T"eP.e.luP,sTANCE 34 W Subgroup ' - Dynamic tests ll maximum rated Temperature.
Case lo Air,0c, 34 . Subgroup 6 - Dynamic tests ll minimum rated temperature.
Junction "rcuse,8, 28 28 W Subgroup 7 - Functional tests It +25'C.
MEAN TiMEBETWEEN Subgroup 8 - Functional tests It maximum and minimum
FAILURES(MTBF)° 2.1 N ttts Hours rated temperatures.
Subgroup 9 - Switching tests at +25'C.
Subgroup IO - Switching tests It maximum rated temperatures.
Subgroup ll - Switching tests It minimum med temperatures.
NOTES Subgroup l2 - Periodically sample tested.
. tom. rested (See Notes I and 2),
.steciiicauon guaranteed by design; not tested,
'"TC-OJOOA parameter! preceded by I check (. )are tested II o 251: ambient temperature. rafurmmc:
" gunman! ova the tnduttrml tempentur: mtg: ( - 2S'C to ' SS'C) cue Icmwntuvc.
'HTC.AB00AM, ATDISJB. AM'HIB paumcttn preceded by I check (. )ue tested ll - Mr. nu.
' 251: Imbient. and - 1151‘. "" Impcnluln
'Noue level muum with Increasing duty cycle M Hold Command. None Iigures shown lot Track mode are
measured with Input grounded Ind tuter, lot Umpteocses show" on output
'v,,.. - 20V pp. 100k": 1m: Inc; R. - Ill); Mode (loam)! Track.
'The "lationslup between the damn package Ind outude envmmment (Du) "nu with the Iyplwlnoo Witte
shown n land on musunn; case Immature mth supply vnlllgu Irphtd m I am: installed
in I ZIF socket mounted on I standard "El" bum-in bond.
'MTBF calculated {or lma unit usual MIL-HNBK 117D; Gmund Fixed; Temmtur: (Ambient) - o WC.
siecftotiatts sublet to change mthout name.
TRACK/HOLD FUNCTION
TRUTH TABLE
With logic levels shown "
HOLD HOLD Operating Mode
(Pin ll) (Pin 12) ofHTC.0300A is
0 0 Track
0 I Track
1 0 Hold
1 I Track
APPLICATIONS
Track-and-hold (T/H) amplifiers can be used in a wide variety
of ways, but the most common application for these units is to
place them ahead of an AID converter. The combination of a
T/H and converter is used when the bandwidth of the signal to
be digitized is wider than the converter can handle by itself,
i.e., the analog input is changing more than one LSB during the
converter's conversion interval.
In applications of this type, the HTC-0300A "freezes" the incoming
signal on command to present a nonchanging signal at the input
stage of the converter.
The HTC-OSOOA T/H can reduce the aperture window to 100
picoseconds when used with the appropriate AID. It can also be
used for peak-holding functions, simultaneous sampling A/Ds
(when combined with analog multiplexers), and other high-speed
analog signal processing applications.
THEORY OF OPERATION
When operated in the "track" mode, the HTC-0300A functions
as an operational amplifier with a gain of - l, following all
changes in the analog input signal as they occur.
When a TTL-compatible digital logic "l" is applied to the Hold
Command input of the T/H, the inverted analog output of the
HTC-0300A is "held" at the value which was present at the
time of the Hold Command, plus the aperture time. If the change
from the "track" mode to the "hold" mode is accomplished via
Pin ll, Hold Command input (Pin 12) must be connected to
ground.
For applications which require an inverted Hold Command, this
"freezing" of the inverted analog output can be accomplished
with a digital "o'' applied to the Hold Command (Pin 12) input.
In this case, a digital "l" establishes the "track" mode of operation.
For these, the Hold Command input (Pin ll) must be connected
to + 5V.
Refer to Figure l, the HTC-0300A Track/Hold Waveforms.
ANALOG Imut I
"'r'N0ut
"nu x t
mmumnumm smau-rTc,,r,,,,i-1.--
--o, P-nME ,'
H now ,1
'[IIOD
ANALDOW musttms """ : 'l'fft
- - T - _ I
- - - I
I 1mm I
t onunc: I ,
nut vomx‘ruu I l
numv __.1 ' aoouusmonmt
Figure 1. Track/Hold Waveforms - HTC-0300A
Two different intervals of time can affect the point on the analog
input which is sampled when the T/H is switched from "track"
to "hold". There is no major difference in operation whether
this change in state is accomplished via the Hold Command or
Wal' Command; the functioning of the HTC-0300A is essentially
the same, with only a slight difference in timing because of an
additional logic package in the Hold Command signal path.
The delay interval, aperture time, is a constant and should not
be regarded as an error source. The design of the HTC-O300A
assures that aperture time is within its spec from unit to unit;
and is also repeatable from one "hold" command to the next in
any given unit. In this way, aperture time can be compensated
with system timing to assure an optimum sampling point.
Aperture uncertainty, or "jitter", is the other interval affecting
the held value. It is the result of noise signals which modulate
the phase of the hold command and shows up as sample-to-sample
variations in the value of the analog signal being "frozen."
As expected, the error resulting from jitter is directly related to
the dV/dt of the analog input. If very-high-speed inputs are
sampled, any given value of jitter will result in larger errors in
the held value at the output as dV/dt increases. See Figure 2.
The high feedthrough rejection of the HTC-0300A in the hold
mode is an important characteristic; it precludes errors being
introduced during the conversion interval of the digitizer.
t2.6 MN up INPUT SIGNAL
10.0 _ _
ERROR — MV
50 BOO 5000
INPUT ANALOG BANDWIDTH - kHz
Figure 2. HTC-0300A Error Due to Aperture Uncertainty
As shown in Figure l, droop is the amount the output changes
during the hold period; this is the result of loading on the internal
hold capacitor. Low droop rates are important in TM amplifiers
to insure they are appropriate for high-resolution digitizing.
Excessive droop rates can negate the effectiveness of having
converters of 10 or 12 bits or more. Lower-order bits may be in
error because of changes in the held value during the conversion
cycle, especially for successive-approximation converters.
The return to the "track" mode is accomplished by changing
the digital logic level of the hold command; Figure I shows the
hold command as it would appear at the (Pin 11) Hold Command
input.
Acquisition Time is the interval required for the analog output
to re-establish accurate tracking of the changing input and remain
within a specified error band around its final value. The greater
the change in the input value during the hold period, the longer
this interval is. Nyquist sampling is the most stringent
application.
Transients shown in Figure 1 are "spikes" which occur at the
output of the T /H at the beginning and end of each "hold"
period because of switching transients within the unit. When a
T/H is used at the output of a D/A converter for "deglitching"
discontinuities in the output of the converter, these transients
occur at the update rate and can be filtered.
SAMPLE-AND-HOLD (S/H) MODE
Although it is generally used in the track-and-hold mode, the
HTC-0300A can also be used as a sample-and-hold device. In
the S/H mode, the output of the unit is usually in the "hold"
mode, but is switched briefly to the "sample" (track) mode.
The width of the the sample pulse applied to the m Command
input (or, if using inverted logic, the Hold Command input) is
determined by (l) the acquisition time of the HTC-0300A, and
(2) the desired accuracy of the sampled output. Output accuracy
will also be a function of the amount of change which has occurred
since the preceding sample.
This latter phenonmenon is illustrated in Figure 3. Note the
analog input has changed drastically between the first and second
hold commands. There is a considerably smaller change between
the third and fourth pulses; as a consequence, movement in the
held value of the output is correspondingly smaller.
TRACK I _
m 'L1ukTudLJ1_l1_fl,
COMMAND HOLD
ANALOG 0U IPUY I I
Figure 3. Sample/Hold Operation
Figure 4 illustrates settling accuracy versus acquisition time;
closer accuracies require more time. The relationship approaches
an asymptotic curve and is not a linear function.
The HTC-OSOOA is a "closed loop" T/H and is suitable for most
applications requiring a track-and-hold for update rates up to
S-10MHz. (Note: SMHZ conversion rates are only a guide and
are based on system acquisition time, not logic speed. Higher
rates are possible with trade-offs in acquisition time.)
" 100 15tt 200
TIME- m
Figure 4. Settling Accuracy vs. Acquisition Time
For optimum performance, the HTC-0300A must have external
bypass capacitors connected to the power supply pins close to
the device. Electrolytic capacitors of IO - 22wF and ceramic
capacitors of 0.01 -0. l wh" on each supply will enhance performance
of the unit.
Output loading has some restrictions. To avoid oscillations,
limit capacitive loads to 250pF; the recommended resistive
loading is 5000. Acquisition and settling times are relatively
unaffected by capacitive loads up to 50pF and resistive loads
down to 2500.
A massive ground plane, careful component layout, and physically
separating digital and analog signals as much as possible are also
among the multitude of items which can affect the operation of
circuits that include the HTC-0300A T /H.
Cross coupling of analog and digital signals is often a major
problem at high frequencies. Relatively low levels of ground
plane noise can "mask" lower-order bits when the HTC-0300A
is used in high-resolution digitizing. The user must exercise
care in electrical and mechanical design to assure satisfactory
performance.
C1105—9—7/87
PRINTED lN U.S.A.
