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DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Data Converters - SMT
Not Recommended for New Designs
Typical Applications
Features
The HMC660LC4B is ideal for:
4.5 GHz Input bandwidth (1 Vpp Full Scale)
3 GS/s Maximum Sampling Rate
• RF ATE Applications
61 dB SFDR (4 GHz / 0.5 Vpp Input, CLK = 1 GS/s)
• Digital Sampling Oscilloscopes
55 dB SFDR (4 GHz / 1 Vpp Input, CLK = 1 GS/s)
• RF Demodulation Systems
Ultra-clean Output Waveforms, Minimal Glitching
• Digital Receiver Systems
>60 dB Hold Mode Feedthrough Rejection
• High Speed Peak Detectors
1.05 mV RMS Hold Mode Output Noise
• Software Defined Radio
Single / Dual Rank Evaluation Boards Available
• Radar, ECM & ELINT Systems
RoHS Compliant 4x4 mm SMT Package
• High Speed DAC De-Glitching
Functional Diagram
General Description
The HMC660LC4B is a SiGe monolithic, fullydifferential, track-and-hold that provides unprecedented
bandwidth and performance to wideband sampled
signal systems. The novel design and low aperture jitter
enable 9 to 10-bit signal capture from 20 MHz to 4.5
GHz while sampling to 3 GS/s. The narrow sampling
aperture allows signal acquisition at frequencies well
beyond the input bandwidth. The output can be held for
5 ns, enabling lower-speed ADCs to sub sample a high
frequency wideband input signal.
Electrical Specifications TA = +25C, See Test Conditions on following page herein.
Parameter
Conditions
Test Level
Min.
Typ.
Max.
Units
Analog Inputs (INP, INN)
Differential Full Scale Range
1
Vpp
AC Coupling Low Frequency Corner
16
MHz
Input Resistance
Return Loss
Each lead to ground
50
Ω
0 to 5 GHz
12
dB
DC Clock Inputs (CLKDCP, CLKDCN)
Common Mode Voltage
2
2.5
3
V
Differential Clock High Voltage (Track Mode)
20
40
2000
mV
Differential Clock Low Voltage (T/H Mode)
-20
-40
-2000
mV
Differential Input Current
Common Mode Input Current
CLKDCP, CLKDCN @ 2.5V
10
µA
6
µA
AC Clock Inputs (CLKP, CLKN)
Amplitude (Sinusoidal Input)
1
Per input terminal
-10
0
10
dBm
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Electrical Specifications, (continued)
Conditions
Test Level
Min.
Recommended for best linearity
Max.
4
Input Impedance
Return Loss
Typ.
0 - 3 GHz
Input Resistance
Units
V/ns
50
Ω
16
dB
50
Ω
1
Vpp
Analog Outputs (OUTP, OUTN)
Differential Full Scale Range
Common Mode Output Voltage
4.0
V
Output Impedance
50
Ω
15
dB
0
dB
Return Loss
0 - 4 GHz
Track Mode Dynamics
Gain
Track Mode Bandwidth
@ 1 Vpp Input
Lower Frequency Corner
3.95
GHz
16
MHz
Single Tone SFDR @ 500 MHz
1 Vpp Input
54.8
dB
Single Tone SFDR @ 1000 MHz
1 Vpp Input
54.7
dB
Single Tone SFDR @ 2000 MHz
1 Vpp Input
52.6
dB
Single Tone SFDR @ 3000 MHz
1 Vpp Input
50.4
dB
Single Tone SFDR @ 4000 MHz
1 Vpp Input
49
dB
0.5 Vpp Input
57.4
dB
Two Tone SFDR @ 995/1005 MHz
0.5 Vpp Input per Tone
56.4
dB
Two Tone SFDR @ 1995/2005 MHz
0.5 Vpp Input per Tone
54.5
dB
Two Tone SFDR @ 2995/3005 MHz
0.5 Vpp Input per Tone
52.5
dB
Two Tone SFDR @ 3995/4005 MHz
0.5 Vpp Input per Tone
50.2
dB
@ 1 GHz
8.9
nV/√Hz
0.95
mV RMS
Two Tone SFDR @ 500 MHz
Noise Spectral Density
Integrated Noise [2]
Data Converters - SMT
Parameter
Clock Slew Rate
Hold Mode Dynamics
Sampling Bandwidth
@ -3 dB Gain, 1 Vpp Input Level
4.5
GHz
0.5
%/ns
0 - 4000 MHz
≥ 60
dB
500 MHz Clock Frequency
1.04
mV RMS
Differential Droop Rate
Feedthrough Rejection
Integrated Noise
[2]
Maximum Hold Time
5
ns
Single Tone THD/SFDR 995 MHz
[1]
-54 / 54
dB
Single Tone THD/SFDR 1995 MHz
[1]
-58 / 58
dB
Single Tone THD/SFDR 2995 MHz
[1]
-59 / 61
dB
Single Tone THD/SFDR 3995 MHz
[1]
-54 / 54
dB
-6
ps
[1]
84
fs
Settling Time to 1 mV
Simulated Value
206
ps
Differential Pedestal
500 MHz Clock Frequency,
0 dBm Clock Power
-0.3
%
Track-to-Hold Switching
Aperture Delay
Aperture Jitter
Clock Frequency
Clock Buffer Pipeline Delay
100
3000
38
MHz
ps
[1] 1 Vpp Input Level, 1 GS/s Clock, Clock Power = 6 dBm / input terminal.
[2] Noise bandwidth limited by output amplifier bandwidth of ~7 GHz.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
2
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Electrical Specifications, (continued)
Conditions
Test Level
Acquisition Time to 1 mV
Min.
Typ.
Simulated Value
Max.
Units
205
ps
Power Supply Requirements
VccSH Voltage
4.75
5
VccSH Current
5.25
V
61
Vcc1 Voltage
4.75
mA
5
Vcc1 Current
5.25
V
50
Vcc2 Voltage
5.7
mA
6
Vcc2 Current
6.3
V
84
VccCLK Voltage
4.75
mA
5
VccCLK Current
Power Dissipation
5.25
V
20
mA
1.16
W
Time Domain Output Waveform
Test Levels
1. 100% production tested at TA = +25C
2. Guaranteed by design/characterization testing
3. Sample Tested
4. Typical value only
DIFFERENTIAL OUTPUT VOLTAGE (V)
Data Converters - SMT
Parameter
Hold-to-Track Switching
0.6
Clock Frequency = 500 MHz
Input Frequency = 3.125 GHz
0.4
0.2
0
-0.2
-0.4
Track Mode
T/H Mode
-0.6
0
2 10
3
4 10
3
6 10
3
8 10
3
10 10
3
TIME (ps)
Dual Rank Second Order SFDR vs. Clock
Slew Rate @ 4 GHz Input Frequency [1]
Sampling Transfer Function
60
0
-2
55
-3
SFDR (dB)
MAGNITUDE (dB)
-1
-4
-5
-6
-7
-8
100
50
45
Sampling Transfer Function
Ideal 4.5 GHz Lowpass
40
1000
10000
0
2
4
FREQUENCY (MHz)
6
8
10
12
14
16
18
20
CLOCK SLEW RATE (V/ns)
[1] Data is derived from linearity measurements at clock frequencies from 0.5 to 3.0 GHz.
3
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Hold-Mode THD vs. Frequency
& Input Power [1]
85
-85
2
nd
Order
65
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
-75
THD (dB)
SFDR (dB)
75
rd
3 Order
55
-65
-55
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
45
1000
2000
3000
-45
1000
4000
FREQUENCY (MHz)
2
nd
-85
Order
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
-75
THD (dB)
SFDR (dB)
4000
Hold-Mode THD vs. Frequency
& Input Power [2]
75
65
3000
FREQUENCY (MHz)
Hold-Mode SFDR vs. Frequency
& Input Power [2]
85
2000
rd
3 Order
55
Data Converters - SMT
Hold-Mode SFDR vs. Frequency
& Input Power [1]
-65
-55
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
45
1000
2000
3000
-45
1000
4000
FREQUENCY (MHz)
4000
Hold-Mode THD vs. Frequency
& Input Power [3]
85
-75
2
nd
Order
-65
rd
3 Order
THD (dB)
SFDR (dB)
3000
FREQUENCY (MHz)
Hold-Mode SFDR vs. Frequency
& Input Power [3]
75
2000
65
55
-55
-45
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
45
2000
3000
4000
FREQUENCY (MHz)
[1] Square Wave Clock: 0.5 GS/s @ 6.3 V/ns Slew Rate
-35
2000
3000
4000
FREQUENCY (MHz)
[3] Clock Power = 0 dBm, Clock Rate 2 GS/s
[2] Clock Power = +6 dBm, Clock Rate 1 GS/s
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
4
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Hold-Mode SFDR vs. Clock Power &
Clock Frequency @ Full Scale (1Vpp) [1]
75
70
55
rd
45
2
Clock Power
0 dBm
+6 dBm
+10 dBm
35
1000
nd
2 GHz
60
Order
80
3 GHz
4 GHz
50
nd
3 Order
90
1 GHz
rd
2 Order SFDR (dB)
65
SFDR (dB)
100
80
3 Order SFDR (dB)
70
4 GHz
60
40
1 GHz
2000
3000
50
30
4000
0
2
FREQUENCY (MHz)
4
6
8
10
Clock Power (dBm)
Hold-Mode SFDR vs. Frequency & Clock
Power @ Full Scale (1Vpp) [2]
Hold-Mode SFDR vs. Clock Power &
Clock Frequency @ Full Scale (1Vpp) [2]
110
85
80
100
1 GHz
Order
nd
65
nd
55
Clock Power
0 dBm
+6 dBm
+10 dBm
45
1000
2000
2 GHz
90
3 GHz
60
80
4 GHz
50
70
4 GHz
40
3 GHz
30
3000
4000
60
1 GHz
0
2
FREQUENCY (MHz)
4
50
6
8
Hold-Mode SFDR vs. Clock Power &
Clock Frequency @ Full Scale (1Vpp) [3]
100
80
70
2 GHz
rd
Order
nd
Clock Power
50
0 dBm
+6 dBm
+10 dBm
40
2000
3000
FREQUENCY (MHz)
rd
nd
80
4 GHz
50
70
40
4 GHz
60
3 GHz
30
4000
90
3 GHz
60
3 Order SFDR (dB)
2
2 Order SFDR (dB)
3 Order
70
SFDR (dB)
10
Clock Power (dBm)
Hold-Mode SFDR vs. Frequency & Clock
Power @ Full Scale (1Vpp) [3]
60
2 GHz
0
2
4
50
6
8
10
Clock Power (dBm)
[1] Clock Rate 0.5 GS/s
[2] Clock Rate 1 GS/s
[3] Clock Rate 2 GS/s
5
rd
rd
3 Order
2
70
3 Order SFDR (dB)
2 Order SFDR (dB)
75
SFDR (dB)
Data Converters - SMT
Hold-Mode SFDR vs. Frequency & Clock
Power @ Full Scale (1Vpp) [1]
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Dual Rank Hold-Mode THD vs. Frequency
& Input Power [1]
85
-85
2
nd
Order
-80
75
-75
70
-70
THD (dB)
SFDR (dB)
80
65
60
55
rd
3 Order
-65
-60
-55
50
-50
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
45
40
1000
2000
3000
-45
-40
1000
4000
Dual Rank Hold-Mode SFDR vs.
Frequency & Input Power [2]
nd
Order
-80
75
-75
70
-70
THD (dB)
SFDR (dB)
4000
-85
2
80
65
rd
3 Order
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
-65
-60
-55
50
-50
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
45
40
1000
2000
3000
-45
-40
1000
4000
2000
3000
4000
FREQUENCY (MHz)
FREQUENCY (MHz)
Dual Rank Hold-Mode SFDR vs.
Frequency & Input Power [3]
Dual Rank Hold-Mode THD vs. Frequency
& Input Power [3]
80
-75
2
75
nd
Order
70
-65
65
60
55
THD (dB)
SFDR (dB)
3000
Dual Rank Hold-Mode THD vs. Frequency
& Input Power [2]
85
55
2000
FREQUENCY (MHz)
FREQUENCY (MHz)
60
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
Data Converters - SMT
Dual Rank Hold-Mode SFDR vs.
Frequency & Input Power [1]
rd
3 Order
-55
50
45
40
35
1000
-45
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
2000
3000
4000
FREQUENCY (MHz)
[1] Square Wave Clock: 0.5 GS/s @ 6.3 V/ns Slew Rate
-35
1000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
2000
3000
4000
FREQUENCY (MHz)
[3] Clock Power = 0 dBm, Clock Rate 2 GS/s
[2] Clock Power = +6 dBm, Clock Rate 1 GS/s
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
6
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Track-Mode Two-Tone SFDR vs.
Frequency [2]
85
85
75
nd
2
75
nd
Order
Order
SFDR (dB)
SFDR (dB)
2
65
55
65
55
rd
3 Order
rd
3 Order
45
45
0
1000
2000
3000
4000
0
FREQUENCY (MHz)
80
75
75
70
70
SFDR (dB)
85
80
65
2
nd
Order
55
3000
4000
2
nd
Order
65
60
55
50
50
rd
3 Order
45
40
1000
2000
Dual Rank Track-Mode Two-Tone
SFDR vs. Frequency [2]
85
60
1000
FREQUENCY (MHz)
Dual Rank Track-Mode Single-Tone
SFDR vs. Frequency [1]
SFDR (dB)
Data Converters - SMT
Track-Mode Single-Tone SFDR vs.
Frequency [1]
2000
rd
3 Order
45
3000
FREQUENCY (MHz)
4000
40
1000
2000
3000
4000
FREQUENCY (MHz)
[1] Input Voltage = 1 Vpp
[2] 10 MHz Tone Separation, 0.5 Vpp per Tone
7
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Aperture Delay: The delay of the exact sample time relative to the time that the hold command is applied to the
device. It is the difference between the delay of the clock switching transition to the hold node and the input signal
group delay to the hold node. If the input signal group delay to the hold node exceeds the clock delay this quantity
can be negative.
Aperture Jitter: The standard deviation of the sample instant in time.
Acquisition Time: The interval between the internal hold-to-track transition and the time at which the hold-node
signal is tracking the input signal within a specified accuracy. It does not include the pipeline delay of the clock buffer.
Differential Pedestal: An error term in the sample value caused by charge redistribution in the T/H switch during
the sampling transition. In general, the pedestal can consist of three components: a fixed offset, a component that is
linearly related to input signal amplitude, and a component that is nonlinearly related to input signal amplitude. The
majority of the pedestal is usually linear. A small nonlinear component can cause sampling nonlinearity.
Differential Droop Rate: The slow drift in the differential output voltage of a held sample while the T/H is in holdmode. It is typically caused by current leakage on the hold capacitors and corresponds to a decay in the held voltage
with increasing time. The majority of the voltage droop over a given time is usually linearly related to the held sample
voltage and is expressed as a percentage of initial amplitude per unit time. Since it is mostly linear, the droop causes
little nonlinearity.
Feedthrough Rejection: A measure of the off-state (hold-mode) isolation of the T/H’s internal switch. It is defined
as the ratio of the amplitude of the output signal (for a sinusoidal input) feeding through during the hold mode to
the amplitude of the output signal during track mode. Normalization by the track-mode signal gives the true switch
isolation without the effects of the output amplifier bandwidth limiting.
Full Scale Range: The voltage range between the minimum and maximum signal levels that can be handled by the
T/H while still meeting the specifications.
Data Converters - SMT
Definition of Specifications
Gain Flatness: The deviation in gain over a specified input band relative to a specified mid-frequency gain.
Sampling Bandwidth: The -3 dB bandwidth of the sampled signal levels represented by the held sample amplitudes.
It includes both the bandwidth of the transfer function from the signal input to the hold-node and any band-limiting
effects associated with the finite time duration of the sampling aperture.
Settling Time: The interval between the internal track-hold transition and the time at which the held output signal is
settled to within a specified accuracy. It does not include the pipeline delay of the clock buffer.
Spurious Free Dynamic Range (SFDR): The ratio (usually expressed in dB) between the sinusoidal output signal
amplitude and the amplitude of the largest non-linearity product falling within one Nyquist bandwidth. It may be
specified for both full scale input and some fraction(s) of full scale input. A SFDR based only on 2nd order nonlinear
products is referred to as the 2nd order SFDR (SFDR2). A SFDR based only on 3rd order products is referred to as the
3rd order SFDR (SFDR3).
Total Harmonic Distortion (THD): The ratio of the total power in the non-linearity-generated harmonics and harmonic
aliases (measured in one Nyquist band) to the output signal power.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
8
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Data Converters - SMT
Application Notes
ESD: On-chip ESD protection networks are incorporated on the terminals, but the RF/microwave compatible interfaces
provide minimal protection and ESD precautions should be used.
Power Supply Sequencing: The recommended power supply startup sequence is Vcc2, Vcc1, VccSH, VccCLK,
(CLKDCP, CLKDCN) if biased from independent supplies. Vcc1, VccSH, VccCLK can be connected to one +5V supply
if desired.
Input Signal Drive: For best results, the inputs should be driven differentially. The input circuit has an on-chip
resistive bias-T for separating the DC and RF components of the input. The low frequency corner of the RF path is
approximately 16 MHz (Coupling=10 pF, Rdc=1.28 K ohm). The input can be driven single-ended but the linearity of
the device will be degraded somewhat.
Clock Input: The clock inputs should be driven differentially if possible. The device is in track-mode when (CLKP –
CLKN) is high and it is in hold-mode when (CLKP-CLKN) is low.
The T/H-mode 2nd order linearity of the device varies somewhat with clock slew rate as shown in the performance
data plots. Because of the slew rate dependence, the 2nd order linearity will vary somewhat with clock power for
sinusoidal signals. For optimal linearity, a clock zero-crossing slew rate of roughly 4 V/ns (per clock input) or more is
recommended. For sinusoidal clock inputs, this corresponds to a sinusoidal clock power per differential half-circuit
input of -3.5 dBm at 3 GHz, 0 dBm at 2 GHz, and 6 dBm at 1 GHz.
At clock frequencies lower than 1 GHz, a square wave clock will provide the best 2nd order linearity performance.
The clock input circuit has an on-chip resistive bias-T for separating the DC and RF components of the input. The low
frequency corner of the RF path is approximately 9 MHz (Coupling=10 pF, Rdc = 1.7 K ohm with clock DC shorted).
Outputs: The outputs should be sensed differentially for the cleanest output waveforms. The output impedance is
50Ω resistive returned to the Vcc2 supply. If the load is also 50Ω returned to the Vcc2 supply, then the Vcc2 supply
should be 5V. If the output is capacitively coupled to 50Ω then the Vcc2 supply should be 6V. The bandwidth of the
output amplifier (beyond the hold-node) is approximately 7 GHz. This produces approximately a 1 dB roll-off at the 3
dB bandwidth of the hold node (4.5 GHz) resulting in an overall track-mode 3 dB bandwidth of approximately 3.9 GHz.
Hence, the output amplitude of the sampled waveform may be somewhat larger than the track mode response at high
input frequencies due to the effect of the output amplifier bandwidth.
The output amplifier noise contribution to the total output noise is substantial. If desired, a significant reduction in
output noise can be achieved by filtering the output to a lower bandwidth than the output amplifier bandwidth of 7
GHz. This is particularly effective if operating at lower clock rates. For example, the output noise can be reduced by
approximately 4 dB if the output bandwidth is reduced by a factor of four from 7 GHz down to 1.75 GHz.
The output will have very sharp transitions at the clock edges due to the broad output amplifier bandwidth. The
user should be aware that any significant length of cable between the chip output and the load will cause frequency
response roll-off and dispersion that can produce low amplitude tails with relatively long time-constants in the settling
of the output waveform into the load. This effect is most noticeable when operating in a lab setting with output cables
of a few feet length, even with high quality cable. Output cables between the T/H and the load should be of very high
quality and 2 ft or less in length.
Reflections between the load and the device will also degrade the hold mode response. The output cable length can
be adjusted to minimize the reflection perturbations to some extent. In general, the round trip transit time of the cable
should be an integer number of clock periods to obtain the minimal reflection perturbation in the hold mode portion of
the waveform. The optimal performance is obtained when the T/H is within 50 ps or less of the load since this gives a
reflection duration equal to the approximate settling time of the device.
9
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
When characterizing the linearity of a T/H, the transfer function linearity of the held samples (referred to as T/H-mode
linearity) is usually the quantity of most interest to the user. These samples contain the signal information that is
ultimately digitized by the downstream A/D converter. Since the T/H-mode linearity is often different than the trackmode linearity, this presents a unique measurement issue in that the linearity of only the hold-portion of the analog
output waveform must be selectively measured.
This issue is aggravated for high speed T/Hs because there are few wide-band time domain instruments (oscilloscopes
or A/D converters) with sufficient linearity to characterize a high linearity T/H. Therefore a frequency domain instrument
(spectrum analyzer) and measurement technique are used which allow selective characterization of the hold-mode
portion of the waveform
A common approach to this requirement has been to cascade two T/Hs in a dual rank configuration such that the
second T/H (T/H 2) re-samples the output of the first T/H (T/H 1). The two T/Hs are usually clocked 180 degrees outof-phase in master-slave operation to eliminate the track-mode portion of the output waveform from the first T/H. This
arrangement produces an output waveform that consists of two time segments. The first segment is the T/H 1 holdmode output as observed through the T/H 2 track-mode transfer function. The second time segment is the T/H 1 holdmode output re-sampled and held by the T/H 2 device. This measurement approach is not a perfect representation
of the linearity of a single T/H due to the impact of the second T/H on the overall linearity. However, it does eliminate
the track-mode portion of the T/H 1 output and permits a spectrum analyzer linearity measurement of the cascaded
devices. Since T/H 2 only has to sample the held waveform from T/H 1, the linearity impact of T/H 2 is primarily
associated with its DC linearity. An often used approximation is that the DC linearity of T/H 2 is much higher than the
slew-rate dependent, high frequency linearity of T/H 1 so that the total non-linearity of the cascade is dominated by
the high frequency linearity of T/H 1. In this case, the dual rank configuration has a net linearity that closely resembles
the linearity of a single T/H, particularly at high frequencies. However, this approximation is not always valid. If not, the
dual rank configuration fails to represent the linearity of a single T/H. The HMC660LC4B represents such a case; the
3rd order nonlinearity of this device varies relatively slowly with frequency and is high enough over the T/H bandwidth
that the DC linearity of the 2nd T/H significantly impacts the overall dual rank configuration.
Data Converters - SMT
Linearity Measurement and Calculation
Another linearity measurement issue unique to the T/H device is the need for output frequency response correction.
In the case of a dual rank T/H, the output waveform resembles a square wave with duration equal to the clock period.
Mathematically, the output can be viewed as the convolution of an ideal delta-function sample train with a single
square pulse of duration equal to one clock period. This weights the output spectral content with a SIN(πf/fs )/(πf/fs)
(Sinc) function frequency response envelope which has nulls at harmonics of the clock frequency fs and substantial
response reduction beyond half the clock frequency. The spectral content of the held samples without the envelope
weighting is required for proper measurement of the sample’s linearity. Either the impact of the response envelope
must be corrected in the data or a measurement method must be used that heterodynes the relevant nonlinear
harmonic products to low frequencies to avoid significant envelope response weighting. This latter method is referred
to as the beat-frequency technique.
The beat-frequency technique is commonly used for high-speed T/H linearity measurements, although the
measurement does impose restrictions on the specific input signal and clock frequencies that can be used. For
example, with a clock frequency of 512.5 MHz, a single tone input at 995 MHz beats with the 2nd harmonic of the
sampling frequency (through the sampling process) to produce a 1st order beat product at 30 MHz. Likewise, the 2nd
and 3rd harmonics of the input signal (generated via distortion in the T/H) beat with the 4th and 6th harmonics of the
sampling frequency respectively to produce 2nd and 3rd order beat products at 60 MHz and 90 MHz. In this manner,
the T/H nonlinearity in the vicinity of 1 GHz can be measured even though the 995 MHz fundamental and the 1.99
GHz and 2.985 GHz nonlinear harmonics are well beyond the 206 MHz bandwidth of the Sinc response envelope.
The possible input frequency choices are overly limited when the low frequency beat-product technique is used at high
clock rates. A related high frequency beat-product measurement utilizing correction for the Sinc envelope weighting
must be employed to measure linearity over a wide range of input frequencies. Hittite uses both low frequency and
high frequency beat product methods to measure linearity for a wide range of clock and signal frequencies. Our high
frequency beat-product measurement avoids excessive envelope correction error by maintaining all beat products
within the 4 dB bandwidth of the Sinc function, where the envelope response is well behaved and easily modeled.
Hittite has also developed a method for accurately measuring the held-sample linearity of a single T/H using a beatfrequency technique that avoids errors due to nonlinear products associated with the track-mode portion of the
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
10
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Data Converters - SMT
Linearity Measurement and Calculation (Continued)
waveform. This single T/H linearity measurement method provides accurate results for clock frequencies up to about
2 GHz. This method is used to characterize and specify the linearity of a single T/H in the data sheet, in addition to
the usual dual rank configuration linearity measurements. Detailed information on the measurement technique and
theory can be found in the Application Note T/H Linearity Measurement Issues and Methods available at www.hittite.
com.
Typical Operating Circuit
Notes:
1. For track mode operation, CLKDCP and CLKDCN must be driven as shown above.
VCM = 2.5V, VDIFF = 40mV typical.
2. For track-and-hold mode operation, pin 11 and 12 may be left floating, or VDIFF can be set to zero.
3. All differential inputs are terminated on-chip with 50 ohms to ground.
11
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
VccSH
5.5 Vdc
Vcc1
5.5 Vdc
Vcc2
6.5 Vdc
CLKP, CLKN Input Power
+10 dBm
Input Signal Amplitude
+10 dBm
Junction Temperature
125 °C
Continuous Pdiss (T= 85 °C)
1.22 W
Thermal Resistance
(junction to package bottom)
32.8 °C/W
Storage Temperature
-65 to +150 °C
Operating Temperature
-40 to +85 °C
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
Data Converters - SMT
Absolute Maximum Ratings
NOTES:
1. PACKAGE BODY MATERIAL: ALUMINA
2. LEAD AND GROUND PADDLE PLATING: 30-80 MICROINCHES GOLD OVER
50 MICROINCHES MINIMUM NICKEL.
3. DIMENSIONS ARE IN INCHES [MILLIMETERS].
4. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm DATUM -C6. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED
TO PCB RF GROUND.
Package Information
Part Number
Package Body Material
Lead Finish
HMC660LC4B
Alumina, White
Gold over Nickel
MSL Rating
MSL3
[1]
Package Marking [2]
H660
XXXX
[1] Max peak reflow temperature of 260 °C
[2] 4-Digit lot number XXXX
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
12
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Data Converters - SMT
Pin Descriptions
Pin Number
Function
1, 13, 19,
23, 24
N/C
Not connected.
2, 5, 14,
17, 20, 22
GND
These pins must be connected to
a high quality RF/DC ground.
3
INP
Positive T/H RF input (input bias -T). Has on-chip DC
50Ω termination, nominal max single-ended input level
= ±0.25V (-2 dBm) for specified performance. Input AC
coupling time constant ~ 10 ns, +10 dBm max.
4
INN
Negative T/H RF input (input bias -T). Has on-chip DC
50Ω termination, nominal max single-ended input level
= ±0.25V (-2 dBm) for specified performance. Input AC
coupling time constant ~ 10 ns, +10 dBm max.
6
VccSH
T/H core supply. Requires nominal current of 61.5 mA
at 5V. A 10 nF X7R dielectric chip capacitor close to the
device is recommended.
7
N/C
8
VccCLK
9, 10
CLKN, CLKP
Negative CLK RF input, Positive CLK RF input (CLK input
bias -T). Has on-chip 50Ω termination, +10 dBm max. AC
coupling time constant ~17 ns.
CLKDCP, CLKDCN
Positive CLKDC input and Negative CLKDC input (CLK
input bias-T). A 10 n F X7R dielectric chip capacitor or
equivalent should be used here. Internal bias -T isolation
resistor = 1kΩ. May be floated for T/H operation. If biased
use common mode voltage of 2.5 V. Apply differential
voltage of (CLKDCP – CLKDCN ) > 20 mV to force device
in steady state track mode (in the absence of a clock). A
40 mV differential voltage can be continuously applied that
allows the device to be biased in track mode whenever the
clock is turned off.
11, 12
13
Description
Interface Schematic
This pin must be left floating.
Clock buffer power. Requires 19.8 mA
nominal current at 5V.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Pin Descriptions (Continued)
Function
Description
OUTP, OUTN
Positive T/H RF output, Negative T/H RF output. 50 Ω
output impedance, nominal DC output voltage = 3.9V.
Can be returned to Vcc2 through 50 ohms or AC coupled.
Device can be damaged if the output is shorted to ground.
18
Vcc2
Output buffer 2 output driver power. The supply should
be 5V if the output is DC coupled to the Vcc2 supply. The
supply should be 6V if the output is AC coupled; Vcc2
current is 84 mA nominal. A 10 nF X 7R dielectric chip
capacitor connected close to the device is recommended
21
Vcc1
5V power for output buffers 1 and 2. Requires a nominal
current of 49.8 mA at 5V. A 10 nF X7R dielectric chip
capacitor connected close to the device is recommended.
15, 16
Interface Schematic
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
Data Converters - SMT
Pin Number
14
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Data Converters - SMT
Single Evaluation PCB
List of Materials for Evaluation PCB 113055 [1]
Item
Description
J1 - J6
Johnson SMA Connector
J7
9 pin DC Connector
C1, C2, C5 - C10
10K pF Chip Capacitor, 0402 Pkg.
C3, C4
1 uF & 82 pF, 16 kHz to 40 GHz Chip
Capacitor, 0502 Pkg.
C15 - C22
4.7 uF, Case A, Tantulum Capacitor
U1
HMC660LC4B Track-and-Hold Amplifier
PCB [2]
113057 Single Eval Board
[1] Reference this number when ordering complete evaluation PCB
The circuit board used in the final application
should use RF circuit design techniques. Signal
lines should have 50 ohm impedance while the
package ground leads and exposed paddle should
be connected directly to the ground plane similar to
that shown. A sufficient number of via holes should
be used to connect the top and bottom ground
planes in order to provide good RF grounding to
10 GHz. The evaluation circuit board shown is
available from Hittite upon request.
[2] Circuit Board Material: Rogers 4350
15
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Data Converters - SMT
Application Circuit for Single Evaluation PCB
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
16
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Characterization Set-up for Single Evaluation PCB
Data Converters - SMT
Not Recommended for New Designs
17
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Data Converters - SMT
Dual Rank Evaluation PCB
List of Materials for Evaluation PCB 114352 [1]
Item
Description
J1 - J8
Johnson SMA Connector
J9
10 Pin DC Connector
C10, C11, C14, C15,
C18 - C25
10K pF Chip Capacitor, 0402 Pkg.
C12, C13
Cap, Chip, 0302 Pkg.
12k pF and 82 pF 130 kHz to 100 GHz
C16, C17
1 uF & 82 pF, 16 KHz to 40 GHz Chip
Capacitor, 0502 Pkg.
C28 - C35
4.7 uF, Case A, Tantulum Capacitor, Note
Polarity
U1, U2
HMC660LC4B Track-and-Hold Amplifier
PCB [2]
114350 Eval Board
The circuit board used in the final application
should use RF circuit design techniques. Signal
lines should have 50 ohm impedance while the
package ground leads and exposed paddle should
be connected directly to the ground plane similar to
that shown. A sufficient number of via holes should
be used to connect the top and bottom ground
planes in order to provide good RF grounding to
10 GHz. The evaluation circuit board shown is
available from Hittite upon request.
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
18
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Data Converters - SMT
Application Circuit for Dual Rank Evaluation PCB
19
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Characterization Set-up for Dual Rank Evaluation PCB
Data Converters - SMT
Not Recommended for New Designs
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
20
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Data Converters - SMT
Product Application Circuits
Direct Conversion Receiver Track-and-Hold Amplifier Application
IN+
OUT-
HIGH
SPEED
ADC
T/H
IN-
HMC460
LNA, DC - 20 GHz
• 2.5 dB Noise Figure
• 14 dB Gain
• +16 dBm P1dB
HMC311LP3
HBT Gain Block
• 14.5 dB Gain
• 4.5 dB Noise Figure
• +15 dBm P1dB
OUT+
50
ASIC/DSP
50
50
CLK-
HMC660LC4B
Track-and-Hold Amplifier
• 0.02 - 4.5 GHz
CLKDC• -66/67 dB Single Tone THD/SFDR
• 3.0 GS/s Max. Clock Rate
CLKDC+
• 0.95 mV RMS Output Noise
• >60 dB Hold Mode
Feedthrough Rejection
50
CLK+
Generic Software Radio Track-and-Hold Amplifier Application
HMC523LC4
I/Q Mixer / IRM
• 15 - 23.6 GHz RF/LO
• 25 dB Image Rejection
• -8 dB Conversion Gain
• +25 dBm Input IP3
• DC - 3.5 GHz IF
IF
IN+
OUT-
T/H
3 GHz
18 GHz
LO
HMC547LP3
Hi-Isolation SPDT
• DC - 20 GHz
• +18 dB Insertion Loss
• 47 dB Isolation
• 23 dBm Input P1dB
• Fast Switching
ADC
IN-
IF
ASIC/DSP
OUT+
50
50
HMC398QS16G
VCO w/ Divide-by-8
• 14 - 15 GHz
• +6 dBm Output Power
• Low Phase Noise
-75 dBc/Hz @ 10 kHz
50
CLK-
50
HMC660LC4B
Track-and-Hold Amplifier
CLKDC- • 0.02 - 4.5 GHz
• -66/67 dB Single Tone THD/SFDR
• 3.0 GS/s Max. Clock Rate
CLKDC+
• 0.95 mV RMS Output Noise
• >60 dB Hold Mode
Feedthrough Rejection
CLK+
Tx
Channel
21
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DISCONTINUED PRODUCT
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
Not Recommended for New Designs
Data Converters - SMT
Notes:
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
22