Hittite HMC1061LC5 Dc - 18 ghz, ultra-wideband, dual rank 4 gs/s track-and-hold amplifier Datasheet

HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
7
Typical Applications
Features
The HMC1061LC5 is ideal for:
18 GHz Input bandwidth (1 Vp-p Full Scale)
4 GS/s Maximum Sampling Rate
• RF ATE Applications
68 dB SFDR (4 GHz / 0.5 Vp-p Input, CLK = 1 GS/s)
• Digital Sampling Oscilloscopes
56 dB SFDR (4 GHz / 1 Vp-p Input, CLK = 1 GS/s)
• RF Demodulation Systems
Direct-Coupled I/O
Data Converters - SMT
• Digital Receiver Systems
Ultra-Clean Output Waveforms, Minimal Glitching
• High Speed Peak Detectors
>60 dB Hold Mode Feedthrough Rejection
• Software Defined Radio
1.5 mV RMS Hold Mode Output Noise
• Radar, ECM & ELINT Systems
RoHS Compliant 5x5 mm SMT Package
• High Speed DAC De-Glitching
Functional Diagram
General Description
The HMC1061LC5 is a SiGe monolithic, fully
differential, dual rank, track-and-hold (T/H) that
provides unprecedented bandwidth and dynamic-range
performance to wideband sampled signal systems.
The T/H offers precision signal sampling over 18 GHz
bandwidth, with 9 - 10-bit linearity from DC to beyond
5 GHz input frequency, 1.5 mV noise, and <70 fs random
aperture jitter. The device can be clocked to 4 GS/s with
minimal dynamic range loss. The T/H can be used to
expand the bandwidth and/or high-frequency linearity
of high-speed A/D conversion and signal acquisition
systems.
Electrical Specifications TA = +25 °C, See Test Conditions on following page herein.
Parameter
Conditions
Test Level
Min.
Typ.
Max.
Units
Full-scale input for linearity test
1
1
Vpp
Each lead to ground
3
50
Ω
Return Loss
0 to 12 GHz
3
-23
dB
Return Loss
12 to 18 GHz
3
-8
Analog Inputs (INP, INN)
Differential Full Scale Range
Input Resistance
Input Common Mode Voltage
dB
3
-0.1
0
0.1
V
3
20
40
2000
mV
3
-2000
-40
-20
mV
2
-6
0
10
dBm
3
-0.5
0
0.5
Clock Inputs (CLKAp, CLKAn, CLKBp, CLKBn)
DC Differential Clock High Voltage
DC Differential Clock Low Voltage
Amplitude (Sinusoidal Input)
Per Port
Input Common Mode Voltage
Clock Slew Rate
3
2-4
V/ns
Return Loss
0 to 3 GHz
3
24
dB
Return Loss
3 to 6 GHz
3
18
dB
Each Lead to Ground
3
50
Ω
Input Resistance
7-1
V
Recommended for best linearity
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Electrical Specifications (continued)
Parameter
Conditions
Test Level
Min.
Typ.
Max.
Units
Analog Outputs (OUTP, OUTN)
4
1
4
0
V
Per Port
3
50
Ω
0 to 5 GHz
3
14
dB
Output Impedance
Return Loss
Vp-p
Track Mode Dynamics
Baseband Gain
1
Track Mode Bandwidth
@ 1 Vp-p Input
-2.5
0
1
dB
4
TBD
GHz
3
TBD
mV RMS
3
18
GHz
Differential Droop Rate (Linear Component)
1
-1.4
%/ns
Differential Droop Rate Magnitude
(Fixed Component)
1
4
mV/ns
3
≥ 60
dB
Integrated Noise [2]
Hold Mode Dynamics
Sampling Bandwidth
Feedthrough Rejection
[2]
@ -3 dB Gain, 1 Vp-p Input Level
@ 3 GHz
3
1.45
mV RMS
Maximum Hold Time (1st Rank)
3
2
ns
Maximum Hold Time (2nd Rank)
3
2
ns
Total Maximum Effective Hold Time
3
4
ns
Integrated Noise
500 MHz Clock Frequency
Single Tone THD/SFDR @ 0.995 GHz
Full Scale Input (1 Vp-p) [1]
3
-54 / 54
dB
Single Tone THD/SFDR @ 1.995 GHz
Full Scale Input (1 Vp-p) [1]
3
-55 / 55
dB
Single Tone THD/SFDR @ 2.995 GHz
Full Scale Input (1 Vp-p) [1]
3
-55 / 55
dB
Single Tone THD/SFDR @ 3.995 GHz
Full Scale Input (1 Vp-p) [1]
1
-55 / 56
dB
Single Tone THD/SFDR @ 4.995 GHz
Full Scale Input (1 Vp-p) [1]
3
-55 / 57
dB
Single Tone THD/SFDR @ 5.995 GHz
Full Scale Input (1 Vp-p) [1]
3
-52 / 54
dB
Single Tone THD/SFDR @ 7.995 GHz
Full Scale Input (1 Vp-p)
[1]
3
-43 / 46
dB
Single Tone THD/SFDR @ 9.995 GHz
Full Scale Input (1 Vp-p) [1]
3
-34 / 37
dB
Single Tone THD/SFDR @ 11.995 GHz
Full Scale Input (1 Vp-p) [1]
3
-31 / 33
dB
Single Tone THD/SFDR @ 0.995 GHz
Half Full Scale Input (0.5 Vp-p) [1]
3
-65 / 65
dB
Single Tone THD/SFDR @ 1.995 GHz
Half Full Scale Input (0.5 Vp-p)
[1]
3
-66 / 66
dB
Single Tone THD/SFDR @ 2.995 GHz
Half Full Scale Input (0.5 Vp-p) [1]
3
-65 / 66
dB
Single Tone THD/SFDR @ 3.995 GHz
Half Full Scale Input (0.5 Vp-p) [1]
3
-66 / 68
dB
Single Tone THD/SFDR @ 4.995 GHz
Half Full Scale Input (0.5 Vp-p) [1]
3
-62 / 63
dB
Single Tone THD/SFDR @ 5.995 GHz
Half Full Scale Input (0.5 Vp-p) [1]
3
-61 / 61
dB
Single Tone THD/SFDR @ 7.995 GHz
Half Full Scale Input (0.5 Vp-p) [1]
3
-51 / 52
dB
Single Tone THD/SFDR @ 9.995 GHz
Half Full Scale Input (0.5 Vp-p) [1]
3
-43 / 44
dB
Single Tone THD/SFDR @ 11.995 GHz
Half Full Scale Input (0.5 Vp-p) [1]
3
-40 / 42
dB
-6
ps
3
<70
fs
3
-1.0
%
3
0.15
%
7
Data Converters - SMT
Differential Full Scale Range
Common Mode Output Voltage
Track-to-Hold & Hold-and-Track Switching
Aperture Delay
Random Aperture Jitter
Differential Pedestal (Linear Component) 1st Rank
Simulated Value
Full-scale Input @ 1 GHz
1 GHz Clock Frequency,
6 dBm Clock Power
1 GHz Clock Frequency,
6 dBm Clock Power
[1] 1 GS/s Clock, Clock Power = 6 dBm / input terminal.
[2] Noise bandwidth limited by output amplifier bandwidth of ~7 GHz.
Differential Pedestal (Linear Component) 2nd Rank
[1]
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
7-2
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Electrical Specifications (continued)
Parameter
Data Converters - SMT
7
Conditions
Test Level
Min.
Typ.
Max.
3
2.8
mV
Differential Pedestal Magnitude (Fixed Component)
2nd Rank
3
1.6
mV
Clock Frequency
@ 50% Duty Cycle
3
250
4000
MHz
Clock Buffer Pipeline Delay
Simulated Value
35
ps
Acquisition Time to 1 mV
Simulated Value
132
ps
Settling Time to 1 mV
Simulated Value
135
ps
Output buffer delay (from 2nd rank hold-node to
output)
Simulated Value
43
ps
Power Supply Requirements
VccTH Voltage (VccTH1 and VccTH2)
VccTH Current (sum of VccTH1 and VccTH2)
1.9
1
VccOF Voltage (VccOF1 and Vcc OF2)
VccOF Current (sum of VccOF1 and Vcc OF2)
1.9
1
VccOB Voltage
VccOB Current
1.9
VccCLK Current (sum of VccCLK1 and VccCLK2)
2
2
1.9
2
-5
-4.75
V
mA
2.1
V
mA
2.1
74
1
Vee Voltage (VeeCLK1, VeeCLK2, Vee)
2.1
47
1
VccCLK Voltage (VccCLK1 and VccCLK2)
2
140
V
mA
2.1
64
V
mA
-4.5
V
(Vee + VeeCLK) Current
1
-357
mA
Power Consumption
1
2.34
W
Test Levels
1. 100% production tested at TA = +25 °C
2. Guaranteed by design/characterization testing
3. Characterization Sample Tested
4. Typical value only
7-3
Units
Differential Pedestal Magnitude (Fixed Component)
1st Rank
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Hold-Mode SFDR vs. Frequency & Input
Power @ fclk = 500 MHz @ +10 dBm [1] [2]
Sampling Transfer Function
80
1
0
70
7
-2
3rd Order Polynomial Fit
-3
SFDR (dB)
-4
-5
60
50
Sampling Transfer Function
-6
40
-7
-8
30
-9
0
4000
8000
12000
16000
0
20000
2
4
6
8
10
12
FREQUENCY (GHz)
FREQUENCY(MHz)
2nd FS SFDR
3rd FS SFDR
2nd HFS SFDR
3rd HFS SFDR
1
Hold-Mode SFDR vs. Frequency
& Input Power @ fclk = 1 GHz @ +6 dBm
80
Track&Hold Mode
0.8
70
0.6
0.4
SFDR (dB)
DIFFERENTIAL OUTPUT VOLTAGE (V)
Time Domain Output Waveform
@ fclk = 500 MHz, fin = 1.125 GHz
0.2
0
-0.2
60
50
-0.4
40
-0.6
-0.8
Track Mode
-1
0
2
4
30
6
8
0
10
2
4
6
8
10
Data Converters - SMT
MAGNITUDE(dB)
-1
12
FREQUENCY (GHz)
TIME (ns)
2nd FS SFDR
3rd FS SFDR
2nd HFS SFDR
3rd HFS SFDR
Hold-Mode SFDR vs. Frequency
& Input Power @ fclk = 2 GHz @ 0 dBm
1
80
0.8
0.6
70
0.4
SFDR (dB)
DIFFERENTIAL OUTPUT VOLTAGE (V)
Time Domain Output Waveform
@ fclk = 500 MHz, fin = 10.125 GHz
0.2
0
-0.2
60
50
-0.4
-0.6
40
-0.8
-1
30
0
2
4
6
8
10
TIME (ns)
0
2
4
6
8
10
12
FREQUENCY (GHz)
2nd FS SFDR
3rd FS SFDR
2nd HFS SFDR
3rd HFS SFDR
[1] FS = Full-Scale input level, HFS = Half-Full-Scale input level
[2] The measurement dynamic range for half-full-scale and full-scale inputs is about 68 dB and 74 dB, respectively, due to measurement noise floor
limitations. Hence the measured spurious products tend to limit at these levels.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
7-4
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Hold-Mode SFDR vs. Frequency
& Input Power @ fclk = 3 GHz @ 0 dBm
80
60
50
40
30
0
2
4
6
8
10
12
FREQUENCY (GHz)
2nd FS SFDR
3rd FS SFDR
2nd HFS SFDR
3rd HFS SFDR
Hold-Mode SFDR vs. Frequency
& Input Power @ fclk = 4 GHz @ 0 dBm
80
70
SFDR (dB)
Data Converters - SMT
7
SFDR (dB)
70
60
50
40
30
0
2
4
6
8
10
12
FREQUENCY (GHz)
2nd FS SFDR
3rd FS SFDR
2nd HFS SFDR
3rd HFS SFDR
7-5
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Definition of Specifications
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: A component 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. The value of the pedestal can be approximated by
P = Po + Plin Vin
where, Po is the fixed pedestal component, Plin is the linear pedestal component, and Vin is the sampled signal
level.
Differential Droop Rate: The slow drift in the differential output voltage of a held sample while the T/H is in hold-mode.
It is typically caused by current leakage on the hold capacitors and corresponds to a decay in the held voltage
with increasing time. The droop can be approximated as the sum of a fixed component and a component that is
linearly related to the held sample voltage. The total droop can be approximated by D = Do + Dlin Vin where Do is
the fixed component, Dlin is the linear droop constant and Vin is the sampled signal level. The sign of Do tends to
be random so only the magnitude is specified. Since the droop is mostly linear, it 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.
7
Data Converters - SMT
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.
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.
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 but does include
the group delay of the output amplifier.
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, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
7-6
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Application Notes
Data Converters - SMT
7
General: The HMC1061LC5 ultra-wideband dual rank T/H amplifier is optimized for use in microwave data conversion
applications requiring maximum sampling bandwidth, high linearity over a very wide bandwidth, and low noise.
A key application of this device is front end sampling for high speed A/D converters to enhance their input
bandwidth and/or high frequency linearity. Although several high speed A/D converters offer enhanced sample
rates, few of them offer input bandwidth beyond a few GHz. In addition, maintenance of good sampling linearity
at frequencies beyond the UHF band is technologically challenging and most A/D converters suffer rapidly
degraded linearity above 1 or 2 GHz signal frequency. The HMC1061LC5 can address these limitations with its
18 GHz input bandwidth and excellent broadband linearity. Once sampling takes place within the T/H, the low
bandwidth held output waveform can be processed by an A/D with substantially reduced bandwidth. In addition,
A/D converter linearity performance limitations at high input frequencies are also mitigated because the settled
waveform is processed with the optimal baseband linearity of the A/D converter.
The dual rank T/H is formed from two cascaded single rank T/Hs which are clocked 180 degrees out of phase
such that while the master TH1 is holding, the slave TH2 is tracking and vice versa. The resulting output waveform
consists of two time segments. The first segment consists of the TH1 hold mode as seen through TH2 track
mode transfer function. At the beginning of the 2nd time segment, TH2 samples the held TH1 waveform and then
continues to hold that value while TH1 switches back to track-mode and reacquires/tracks the input waveform.
The resulting output waveform provides a held sample value of nearly one complete clock cycle, thus presenting
the downstream A/D converter with a constant, settled waveform with minimal high frequency spectral content.
The device can be clocked in one of two ways depending on the voltage applied to the CLKSEL terminal. The
device can be configured such that the slave T/H uses an internal clock derived and buffered from the master
clock (Clock A). In this case, the CLKSEL terminal should be grounded, the user only needs to provide Clock
A, and the internal clock 2 driving the slave always operates at the same frequency as the master Clock A.
Alternatively, the CLKSEL terminal can be connected to the Vee supply enabling external Clock B control of the
slave. In this mode, users must supply both Clock A and Clock B but they have the option of operating the slave
at the same or even a different frequency than the master. This mode can be useful for decimation operations
(where Clock B is a submultiple of the master clock) or other more exotic clocking schemes. In all cases, the
maximum hold time limits shown in the table must be followed.
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 VccOB, VccOF, VccTH, VccCLK,
Vee / VeeCLK if biased from independent supplies. VccOB, VccOF, VccTH and VccCLK can be connected to one
+2 V supply if desired.
Input Signal Drive: For best results, the inputs should be driven differentially. The input can be driven single-ended
but the linearity of the device will be degraded somewhat. The unused input should be terminated in 50 Ohms
when driving the device single-ended.
Clock Input: The 1st rank device is in track-mode when (CLKAp – CLKAn) is high and it is in hold-mode when (CLKAp
– CLKAn) is low. The 2nd rank device has an opposite polarity clock. It is in track-mode when (CLKBp-CLKBn)
is low. The clock inputs should be driven differentially if possible. The clock inputs can be driven single-ended
if desired but the single-ended amplitude/slew rate should be similar to the full differential amplitude / slew rate
recommended for differential drive. The unused input should be terminated in 50 ohms.
The T/H-mode linearity of the device varies somewhat with clock power at lower clock frequencies. This results
from a weak dependence of the linearity on clock zero crossing slew rate for slew rates beneath a critical value. For
optimal linearity, a clock zero-crossing slew rate of roughly 2 - 4 V/ns (per clock input) or more is recommended.
For sinusoidal clock inputs, 4 V/ns corresponds to a sinusoidal clock power per differential half-circuit input of
-6 dBm at 4 GHz, 0 dBm at 2 GHz, and 6 dBm at 1 GHz. Regardless of the clock frequency, a minimum clock
amplitude of -6 dBm is recommended (per differential half-circuit input).
Outputs: The outputs should be sensed differentially for the cleanest output waveforms. The output impedance is
50 Ohms resistive returned to the VccOB supply. The output stage is designed to drive 50 ohms terminated to
ground on each differential half-circuit output. The device offers a true ground-referenced common mode output
7-7
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Application Notes (continued)
The bandwidth of the output amplifier that buffers the T/H signal between the hold-node and the 50 ohm outputs is
approximately 7 GHz. The broad output buffer bandwidth is maintained to support the fast settling times required
for users operating at high clock rates. However, because of the broad bandwidth, the output amplifier noise
contribution to the total output noise is significant. Users operating at lower clock rates (such as < 1 GHz) may
optimize their signal-to-noise ratio by filtering the output to a lower bandwidth than the output amplifier bandwidth
of 7 GHz. Such an output filter will not reduce the sampled front-end noise (which is frozen into the signal samples
and represents the majority of the T/H noise because of the wide front-end bandwidth) but it can reduce the
output amplifier noise contribution. The user can filter the output to the lowest bandwidth that still retains the
maximum settling time required to support the chosen clock rate. Typically this optimal bandwidth is of the order
of 2 to 3 times the clock rate and it can be realized with a simple single pole RC filter if desired (for example a
shunt capacitance on the outputs). For example, a user operating at a clock rate of 350 MHz with a 1 GHz noise
bandwidth output filter can achieve approximately 1 dB lower noise relative to the unfiltered output condition.
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. In A/D converter
applications the T/H should be placed as close as possible to the A/D converter to minimize reflection effects on
the path between the T/H output and the input of the A/D converter.
7
Data Converters - SMT
that is usually within ±50 mV of ground; however it is possible to adjust the VccOB power supply slightly to fine
tune the output common-mode level to precisely 0 V if desired. Additionally, the common-mode output level may
be adjusted within the range of approximately ±0.5 V by adjusting the VccOB power supply according to the
approximate relation Vocm=(VccOB-2)/2 where Vocm is the output common mode voltage and VccOB can be
varied in the range of +1 V < VccOB < +3 V.
Linearity Measurement
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. A linearity measurement issue unique to the T/H device is the need for output
waveform 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. This spectral content and envelope function are
observed during spectrum analyzer measurement because the analyzer simply reproduces the entire spectrum of the
incoming waveform. However, the spectral content of the held samples without the envelope weighting is required for
proper measurement of the sample’s linearity, as would be measured by a downstream A/D converter that samples
a time instant in the held waveform. 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 low frequency beat-product
technique.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
7-8
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Linearity Measurement (continued)
Data Converters - SMT
7
The low frequency beat-product 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 256 MHz 4 dB bandwidth of the SINx/x 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 SINx/x 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.
Independent and accurate measurement of linearity in a T/H waveform (without a downstream ADC to sample a single
point on the held waveform) is challenging at these low nonlinearity levels. This is due to the waveform transitions/
small glitches that can impact the measured spectrum during direct spectrum analyzer measurements of the output
waveform (without sampling). These measurement artifacts are worst case at high clock frequencies where a
significant fraction of the waveform duration is consumed by transients. It is believed that these measurement artifacts
at high clock frequencies contribute to the linearity ripple seen in the plots at higher clock rates. The true linearity is
likely represented by the average through these curve variations.
For the same reasons as described above, we find that the linearity characterization of the T/H waveform via direct
spectrum analysis tends to represent a worst case scenario relative to the true linearity obtained by sampling one
point on the held waveform as would be obtained during T/H-ADC measurements. This is supported by our T/H-ADC
combination measurements documented in our application notes that show substantially better linearity, particularly
at low signal frequencies. The measured linearity presented here from direct spectrum analysis of the entire T/H
waveform is believed to represent a worst case indication of the true T/H linearity.
Absolute Maximum Ratings
7-9
VccTHx, VccOFx, VccCLKx
2.1 Vdc
VccOB
3 Vdc
Vee, VeeCLK
-5.25 Vdc
CLKAp, CLKAn, CLKBp, CLKBn
Input Power
+10 dBm
INp, INn Input Power
+10 dBm
Junction Temperature
125 °C
Continuous Pdiss (T= 85 °C)
2.5 W
Thermal Resistance
(junction to package bottom)
16.0 °C/W
Storage Temperature
-65 to +150 °C
Operating Temperature
-40 to +85 °C
ESD Sensitivity (HBM)
Class 1B
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Outline Drawing
NOTES:
1. PACKAGE BODY MATERIAL: ALUMINA
2. LEAD AND PADDLE PLATING: 30-80 MICROINCHES GOLD OVER
50 MICROINCHES MINIMUM NICKEL.
Data Converters - SMT
7
3. DIMENSIONS ARE IN INCHES [MILLIMETERS].
4. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
5. PACKAGE WARP SHALL NOT EXCEED 0.05 mm DATUM -C6. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND.
PACKAGE BASE MUST BE SOLDERED TO Vee PLANE.
7. CLASSIFIED AS MOISTURE SENSITIVITY LEVEL (MSL) 1.
8. DUE TO THE DEVICE’S POWER DISSIPATION OF 2.34 W, THE PADDLE
TEMPERTURE SHOULD BE HELD BELOW 85 °C, PREFERABLY USING
VERTICAL THERMAL CONDUCTION TO A HEAT SINK.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
7 - 10
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Pin Descriptions
7
Pin Number
Function
1, 2, 3, 6,
19, 22
GNDa
INP
5
INN
Differential signal input (negative)
DC-coupled, ground referenced input with nominal
common mode level = 0 V
Input impedance = 50 ohms
Full-scale differential voltage = 1 Vpp
Maximum input level = +10 dBm
7, 16
VeeCLK1
VeeCLK2
Clock buffer Vee supplies
Nominal voltage = -4.75 V (Vee+VeeCLK1+VeeCLK2)
Current = -357 mA nominal
8, 17
VccCLK1
VccCLK2
Clock buffer Vcc supplies
Nominal voltage = +2 V (VccCLK1+VccCLK2)
Current = 64 mA nominal
9, 12, 15
GNDc
Clock ground. This ground and analog ground must be
connected to the same DC potential but they can be
RF-isolated from each other.
CLKAn
CLKAp
Differential clock A input (negative and positive)
Provides clock to 1st rank device
Also provides properly timed clock to 2nd rank device when
clk_sel = 0 V
DC-coupled, ground referenced input with nominal
common mode level = 0 V
Input impedance = 50 ohms
1st rank track mode: differential clock positive
1st rank hold mode: differential clock negative
Maximum input level = +10 dBm
CLKBn
CLKBp
Differential clock B input (negative and positive)
Provides clock to 2nd rank device if clk_sel = -4.75 V
DC-coupled, ground referenced input with nominal
common mode level = 0 V
Input impedance = 50 ohms
Terminated if unused
2nd rank track mode: differential clock negative
2nd rank hold mode: differential clock positive
Maximum input level = +10 dBm
Data Converters - SMT
10,
11
13,
14
18
CLK_SELECT
Interface Schematic
Analog ground. This ground and clock ground must
be connected to the same DC potential but they can be
RF-isolated from each other if desired.
Differential signal input (positive)
DC-coupled, ground referenced input with nominal
common mode level = 0 V
Input impedance = 50 ohms
Full-scale differential voltage = 1 Vpp
Maximum input level = +10 dBm
4
7 - 11
Description
Clock mode select terminal
Nominal 0 V for internal clock B mode, current = 230 µA
nominal
Nominal -4.75 V for external clock B mode, current =
-230 µA nominal
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC1061LC5
v01.0613
DC - 18 GHz, ULTRA-WIDEBAND, DUAL RANK
4 GS/s TRACK-AND-HOLD AMPLIFIER
Pin Descriptions (continued)
Function
20, 21
OUTp, OUTn
24, 26, 28,
30, 32,
Package
Base
Vee
Description
Differential output (positive and negative)
DC-coupled, ground refernced output with nominal
common mode level = 0 V
Output impedance = 50 ohms
Intended to be DC or AC coupled to 50 ohm load
impedance
Vee supply
Nominal voltage = -4.75 V (Vee+VeeCLK1+VeeCLK2),
current = -357 mA nominal
VccOB
Vcc supply for the 50 ohm output buffer
Nominal voltage = +2 V, current = 74 mA nominal
Can be biased with +1 <Vcc_ob <+3 V to adjust the output
common mode voltage to an exact desired value between
-0.5 and 0.5 V. Output common mode voltage adjustment
has a sensitivity of apporximately Vocm (V) ~ 0.5 (Vcc_ob
- 2)
25,
29
VccOF2
VccOF1
Vcc supplies for front end of the output buffer circuitry
VccOF2 is for the output of the IC, while VccOF1 is for the
interstage buffer between the 1st and 2nd rank T/Hs
Nominal voltage = +2 V (VccOF1+VccOF2), current =
47 mA nominal
27,
31
VccTH2
VccTH1
VccTH2 supply for 2nd rank T/H core circuitry and VccTH1
is the supply fo the 1st rank T/H
Nominal voltage = + 2 V (VccTH1+VccTH2), current =
140 mA nominal
23
Interface Schematic
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
7
Data Converters - SMT
Pin Number
7 - 12
HMC1061LC5
v01.0613
DC - 18 GHz ULTRA-WIDEBAND,
4 GS/s TRACK-AND-HOLD AMPLIFIER
Evaluation PCB
Data Converters - SMT
7
List of Materials for Evaluation PCB
EVAL01-HMC1061LC5 [1]
Item
Description
J1, J2, J7, J8
SRI K-Connector
J3 - J6
SRI SMA-Connector
J9
Header, 0.9”, 9 Pin, Thruhole, TIN
J10
DC Pin
C1 - C6, C14
0.01 µF Capacitor, 0402 Pkg.
C7 - C12
4.7 µF Capacitor, Tantalum
L1 - L4
Ferrite, 0402, Steward LI0402E300R-10
L5
Ferrite, 1206, Steward HF1206J150R-10
L6
Ferrite, 0603, Steward LI0603E470R-10
R16
0 Ohm Resistor, 0402 Pkg.
U1
HMC1061LC5 Track-and-Hold Amplifier
PCB [2]
600-00176-00 Evaluation Board
The circuit board used in the application should use
RF circuit design techniques. Signal lines should
have 50 ohm impedance while the package ground
leads should be connected directly to the ground
plane similar to that shown. The package base is
internally connected to the Vee and VeeCLK supply
and should be connected to a Vee supply plane
for heat sinking. A sufficient number of via holes
should be used to connect the top and bottom
ground planes in order to provide good RF grounding. The evaluation circuit board shown is available
from Hittite upon request.
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Arlon 25FR or Rogers 4350
7 - 13
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC1061LC5
v01.0613
DC - 18 GHz ULTRA-WIDEBAND,
4 GS/s TRACK-AND-HOLD AMPLIFIER
Application Circuit for Evaluation PCB
Data Converters - SMT
7
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
7 - 14
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