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DC to 2.0 GHz Multiplier ADL5391
FEATURES
Ultrafast symmetric multiplier Function: VW = x (VX x VY)/1 V + VZ Unique design ensures absolute XY-symmetry Identical X and Y amplitude/timing responses Adjustable gain scaling, DC-coupled throughout, 3 dB bandwidth of 2 GHz Fully differential inputs, may be used single ended Low noise, high linearity Accurate, temperature stable gain scaling Single-supply operation (4.5 V to 5.5 V @ 130 mA) Low current power-down mode 16-lead LFCSP
FUNCTIONAL BLOCK DIAGRAM
YMNS YPLS GADJ
XPLS XMNS
ZMNS ZPLS WPLS
ENBL VMID
WMNS
ADL5391
COMM VPOS
06059-001
W = XY/1V+Z
Figure 1.
APPLICATIONS
Wideband multiplication and summing High frequency analog modulation Adaptive antennas (diversity/phased array) Square-law detectors and true rms detectors Accurate polynomial function synthesis DC capable VGA with very fast control
GENERAL DESCRIPTION
The ADL5391 draws on three decades of experience in advanced analog multiplier products. It provides the same general mathematical function that has been field proven to provide an exceptional degree of versatility in function synthesis. VW = x (VX x VY)/ 1 V + VZ The most significant advance in the ADL5391 is the use of a new multiplier core architecture, which differs markedly from the conventional form that has been in use since 1970. The conventional structure that employs a current mode, translinear core is fundamentally asymmetric with respect to the X and Y inputs, leading to relative amplitude and timing misalignments that are problematic at high frequencies. The new multiplier core eliminates these misalignments by offering symmetric signal paths for both X and Y inputs. The Z input allows a signal to be added directly to the output. This can be used to cancel a carrier or to apply a static offset voltage. The fully differential X, Y, and Z input interfaces are operational over a 2 V range, and they can be used in single-ended fashion. The user can apply a common mode at these inputs to vary from the internally set VPOS/2 down to ground. If these inputs
Rev. 0
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 that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
are ac-coupled, their nominal voltage will be VPOS/2. These input interfaces each present a differential 500 input impedance up to approximately 700 MHz, decreasing to 50 at 2 GHz. The gain scaling input, GADJ, can be used for fine adjustment of the gain scaling constant () about unity. The differential output can swing 2 V about the VPOS/2 common-mode and can be taken in a single-ended fashion as well. The output common mode is designed to interface directly to the inputs of another ADL5391. Light dc loads can be ground referenced; however, ac-coupling of the outputs is recommended for heavy loads. The ENBL pin allows the ADL5391 to be disabled quickly to a standby mode. It operates off supply voltages from 4.5 V to 5.5 V while consuming approximately 130 mA. The ADL5391 is fabricated on Analog Devices proprietary, high performance, 65 GHz, SOI complementary, SiGe bipolar IC process. It is available in a 16-lead, Pb-free, LFCSP and operates over a -40C to +85C temperature range. Evaluation boards are available.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2006 Analog Devices, Inc. All rights reserved.
ADL5391 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ..............................................7 General Description....................................................................... 10 Basic Theory ............................................................................... 10 Basic Connections...................................................................... 10 Evaluation Board ............................................................................ 13 Outline Dimensions ....................................................................... 15 Ordering Guide .......................................................................... 15
REVISION HISTORY
7/06--Revision 0: Initial Version
Rev. 0 | Page 2 of 16
ADL5391 SPECIFICATIONS
VPOS = 5 V, TA = 25C, ZL = 50 differential, ZPLS = ZMNS = open, GADJ = open, unless otherwise noted. Transfer function: W = XY/1 V + Z, common mode internally set to 2.5 V nominal. Table 1.
Parameter MULTIPLICAND INPUTS (X, Y) Differential Voltage Range Common-Mode Range Input Offset Voltage vs. Temperature Differential Input Impedance Fundamental Feedthrough, X or Y Conditions XPLS, XMNS, YPLS, YMNS Differential, common mode = 2.5 V For full differential range DC -40C to +85C f = dc f = 2 GHz f = 50 MHz, X (Y) = 0 V, Y (X) = 0 dBm, relative to condition where X (Y) = 1 V f = 1 GHz X = 50 MHz and 0 dBm, Y = 1 V X = 1 GHz and 0 dBm, Y = 1 V X to output, Y = 1 V X=Y=1V 1 V p-p, Y = 1 V, f = 50 MHz ZPLS, ZMNS Common mode from 2.5 V down to COMM For full differential range From Z to W, f 10 MHz, 0 dBm, X = Y = 1 V f = dc f = 2 GHz WPLS, WMNS No external common mode X = Y = 1 V dc f = 1 MHz f = 1 GHz X=Y=0 f = 1 MHz f = 1 GHz X = Y = 0, f = 1 MHz Z = 0 V differential f = dc f = 200 MHz f = 2 GHz X, Y, Z to W W from -2.0 V to +2.0 V, 150 X stepped from -1 V to +1 V, Z = 0 V, 150 X (Y) = 0 dBm, Y (X) = 1 V, fund = 10 MHz Fund = 200 MHz X (Y) = 0 dBm, Y (X) = 1 V, fund = 10 MHz Fund = 200 MHz 0 8800 2.1 -60 -51 -61.5 -51.6 Min Typ 2 0 20 20 500 150 -42 -35 0.5 -1.33 1 1 42.1 2 0 0.1 500 150 2 VPOS - 2.5 -133 -133 -138 -138 26.7 19 19 0 75 500 2 2.5 2.5 Max Unit V p-p V mV mV dB dB dB dB % FS V/V dB V p-p V dB V V dBm/Hz dBm/Hz dBm/Hz dBm/Hz nV/Hz mV mV GHz V/s ns dBc dBc dBc dBc
Gain DC Linearity Scale Factor CMRR SUMMING INPUT (Z) Differential Voltage Range Common-Mode Range Gain Differential Input Impedance OUTPUTS (W) Differential Voltage Range Common-Mode Output Output Noise Floor
Output Noise Voltage Spectral Density Output Offset Voltage vs. Temperature Differential Output Impedance
DYNAMIC CHARACTERISTICS Frequency Range Slew Rate Settling Time Second Harmonic Distortion Third Harmonic Distortion
Rev. 0 | Page 3 of 16
ADL5391
Parameter OIP3 Conditions Two-tone IP3 test; X (Y) = 100 mV p-p/tone (-10 dBm into 50 ), Y (X) = 1 f1= 49 MHz, f = 50 MHz f1 = 999 MHz, f2 = 1 GHz f1 = 49 MHz, f = 50 MHz f1 = 999 MHz, f2 = 1 GHz X (Y) to W, Y (X) = 1 V, 50 MHz 1 GHz 200 MHz 1 GHz f = 3.58 MHz f = 3.58 MHz GADJ Unconnected Input 0 V to 2 V VMID Common-mode for X, Y, Z = 2.5 V VPOS, COMM, ENBL 4.5 Common-mode for X, Y, Z = 2.5 V ENBL = 0 V High to Low Delay following high-to-low transition until device meets full specifications Delay following low-to-high transition until device produces full attenuation 135 7.5 1.5 150 50 Min Typ Max Unit
OIP2 Output 1 dB Compression Point Group Delay Differential Gain Error, X/Y Differential Phase Error, X/Y GAIN TRIMMING () Nominal Bias Input Range Gain Adjust Range REFERENCE VOLTAGE Source Current POWER AND ENABLE Supply Voltage Range Total Supply Current Disable Current Disable Threshold Enable Response Time Disable Response Time
26.5 14 45.5 28 15.1 13.2 0.5 0.7 2.7 0.23 1.12 0 9.5 VPOS/2 50 5.5 2
dBm dBm dBm dBm dBm dBm ns ns % Degrees V V dB V mA V mA mA V ns ns
Rev. 0 | Page 4 of 16
ADL5391 ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Supply Voltage VPOS ENBL XPLS, XMNS, YPLS, YMNS, ZPLS, ZMNS GADJ Internal Power Dissipation JA (With Pad Soldered to Board) Maximum Junction Temperature Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering 60 sec) Rating 5.5 V 5.5 V VPOS VPOS 800 mW 73C/W 150C -40C to +85C -65C to +150C 300C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. 0 | Page 5 of 16
ADL5391 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
15 ENBL 14 XMNS 16 VMID 13 XPLS
COMM 1 VPOS 2 VPOS 3 VPOS 4
PIN 1 INDICATOR
12 YMNS 11 YPLS 10 ZPLS 9 ZMNS
ADL5391
WMNS 6
COMM 7
WPLS 5
GADJ 8
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. 1, 7 2 to 4 5, 6 8 9, 10 11, 12 13, 14 15 16 Mnemonic COMM VPOS WPLS, WMNS GADJ ZMNS, ZPLS YPLS, YMNS XPLS, XMNS ENBL VMID Description Device Common. Connect via lowest possible impedance to external circuit common. Positive Supply Voltage. 4.5 V to 5.5 V. Differential Outputs. Denominator Scaling Input. Differential Intercept Inputs. Must be ac-coupled. Differential impedance 50 nominal. Differential X-Multiplicand Inputs. Differential Y-Multiplicand Inputs. Chip Enable. High to enable. VPOS/2 Reference Output. Connect decoupling capacitor to circuit common.
Rev. 0 | Page 6 of 16
06059-002
ADL5391 TYPICAL PERFORMANCE CHARACTERISTICS
GADJ = open.
3.0 2.5 2.0 1.5 1.0
WDIFF (VDC)
Y = -2 Y = -1 Y=0 Y = +1 Y = +2
14 12 10 8 6 4
200 150 100 50 -0 -50 -100 -150 -200
06059-010
GAIN (dB)
0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5
06059-007
2 0 -2 -4 -6 -8 -10 -12 -14
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
XDIFF (VDC)
Figure 3. Full Range DC Cross Plots
0.20 0.15 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.20 Y = -2 Y = -1 Y=0 Y = +1 Y = +2
06059-008
Figure 6. Gain and Phase vs. Frequency of X Swept and Y = 1 V, Z = 0 V, PIN = 0 dBm
4 3 2 1 200 150 100 50 -0 -50 -100 -150 -200
06059-011
5 100 195 290 385 480 575 670 765 860 955 1050 1150 1240 1340 1430 1530 1620 1720 1810 1910 2000
FREQUENCY (MHz)
-3.0 -2.5
0 -1 -2 -3 -4
1
110
220
330
440
550
660
700
880
990
1100
1200
-0.15
-0.10
-0.05
0
0.05
0.10
0.15
0.20
XDIFF (VDC)
FREQUENCY (MHz)
Figure 4. Magnified DC Cross Plots
2.5
Figure 7. Gain and Phase vs. Frequency of Z Inputs, X = 0 V, Y = 0 V, PIN = 0 dBm
2.0 1.5 X INPUT = 1.0V p-p, @ 200MHz Y INPUT = 1.0V DC DIFFERENTIAL
2.0
1.0
GAIN (V/V)
1.5
WOUTPUT (V)
0.5 0 -0.5 -1.0
1.0
0.5
-1.5
06059-009
-0.5
0
0.5 GADJ (VDC)
1.0
1.5
2.0
25.5
26.5
27.5
28.5
29.5
30.5
31.5
32.5
33.5
TIME (ns)
Figure 5. Gain vs. GADJ (X = Y = 1)
Figure 8. Large Signal Pulse Response
Rev. 0 | Page 7 of 16
06059-013
0 -1.0
-2.0 24.5
1300
PHASE (Degrees)
WDIFF (VDC)
GAIN (dB)
PHASE (Degrees)
ADL5391
0.20 0.15 0.10 X INPUT = 100mV p-p, @ 200MHz Y INPUT = 1.0V DC DIFFERENTIAL 30
25
WOUTPUT (V)
OIP3 (dBm)
0.05 0 -0.05 -0.10 -0.15 -0.20 24.5
20 Y=1 15 Y = 0.5
10
5
06059-014
25.5
26.5
27.5
28.5 TIME (ns)
29.5
30.5
31.5
32.5
0
500
1000 FREQUENCY (MHz)
1500
2000
Figure 9. Small Signal Pulse Response
0.05 0.04 0.03 0.02
10MHz 200MHz
Figure 12. OIP3 vs. Frequency Pin 0 dBm, Y = 1 V dc, 0.5 V dc
WDIFF (VDC)
0.01 0 -0.01 -0.02 -0.03
+85C, X = +1 +85C, X = -1 -40C, X = -1 -40C, X = +1 +25C, X = -1 +25C, X = +1
10dBm/DIV
10dBm/DIV
400MHz
600MHz
30MHz 20MHz
06059-094
-0.04
06059-021 06059-019
-0.05 -0.05 -0.04 -0.03 -0.02 -0.01
0
0.01
0.02
0.03
0.04
0.05
YDIFF (VDC)
Figure 10. Harmonic Distortion at 10 MHz and 200 MHz; 0 dBm Input to X (Y) Channels
28 26 40 24 45
Figure 13. Z (W) Offset Over Temperature
X = 0V, Y = 1V
AVERAGE VOFFSET (VDC)
X = Y = 1V 35
22
SND (nV/ Hz)
20 18 16 14
X = Y = 0V 30
25
20 12
06059-015
10 -40
15 200 400 600 800 1000 1200 1400 1600 1800 2000 FREQUENCY (MHz)
-15
10
35
60
85
TEMPERATURE (C)
Figure 11. X ( Y) Offset Drift vs. Temperature
Figure 14. Noise vs. Frequency
Rev. 0 | Page 8 of 16
06059-016
0
ADL5391
S22 SE
1.00UFS
S11 SE
1.00UFS
S11 DIFF S22 DIFF
1.000
3001.000
1.000
3001.000 201.000 1001.000 1901.000 0.947 U 0.569 U 0.597 U 0.905 U 0.663 U +170.736 DEG +58.257 DEG -69.673 DEG +157.308 DEG -39.468 DEG
06059-018
201.000 1001.000 1901.000 201.000 2001.000
0.654 U 0.594 U 0.531 U 0.800 U 0.564 U
-36.340 DEG -92.533 DEG -94.448 DEG
06059-017
-17.218 DEG -58.167 DEG
201.000 2001.000
Figure 15. Input S11
Figure 16. Output S22
Rev. 0 | Page 9 of 16
ADL5391 GENERAL DESCRIPTION
BASIC THEORY
The multiplication of two analog variables is a fundamental signal processing function that has been around for decades. By convention, the desired transfer function is given by W = XY/U + Z where: X and Y are the multiplicands. U is the multiplier scaling factor. is the multiplier gain. W is the product output. Z is a summing input. All the variables and the scaling factor have the dimension of volts. In the past, analog multipliers, such as the AD835, were implemented almost exclusively with a Gilbert Cell topology or a close derivative. The inherently asymmetric signal paths for X and Y inevitably create amplitude and delay imbalances between X and Y. In the ADL5391, the novel multiplier core provides absolute symmetry between X and Y, minimizing scaling and phasing differences inherent in the Gilbert Cell. The simplified block diagram of the ADL5391 shows a main multiplier cell that receives inputs X and Y and a second multiplier cell in the feedback path around an integrating buffer. The inputs to this feedback multiplier are the difference of the output signal and the summing input, W - Z, and the internal scaling reference, U. At dc, the integrating buffer ensures that the output of both multipliers is exactly 0, therefore (W - Z)xU = XY, or W = XY/U + Z (2) (1) The small-signal bandwidth from the inputs X, Y, and Z to the output W is a single-pole response. The pole is inversely proportional to . For = 1 (GADJ floating), the bandwidth is about 2 GHz; for > 1, the bandwidth is reduced; and for < 1, the bandwidth is increased. All input ports, X, Y, and Z, are differential and internally biased to midsupply, VPOS/2. The differential input impedance is 500 up to 100 MHz, rolling off to 50 at 2 GHz. All inputs can be driven in single-ended fashion and can be ac-coupled. In dc-coupled operation, the inputs can be biased to a common mode that is lower than VPOS/2. The bias current flowing out of the input pins to accommodate the lower common mode is subtracted from the 50 mA total available from the internal reference VPOS/2 at the VREF pin. Each input pin presents an equivalent 250 dc resistance to VPOS/2. If all six input pins sit 1 V below VPOS/2, a total of 6 x 1 V/250 = 24 mA must flow internally from VREF to the input pins.
Calibration
The dc offset of the ADL5391 is approximately 20 mV but changes over temperature and has variation from part to part (see Figure 4). It is generally not of concern unless the ADL5391 is operated down to dc (close to the point X = 0 V or Y = 0 V), where 0 V is expected on the output (W = 0 V). For example, when the ADL5391 is used as a VGA and a large amount of attenuation is needed, the maximum attenuation is determined by the input dc offset. Applying the proper voltage on the Z input removes the W offset. Calibration can be accomplished by making the appropriate cross plots and adjusting the Z input to remove the offset. Additionally, gain scaling can be adjusted by applying a dc voltage to the GADJ pin, as shown in Figure 5.
By using a feedback multiplier that is identical to the main multiplier, the scaling is traced back solely to U, which is an accurate reference generated on-chip. As is apparent in Equation 2, noise, drift, or distortion that is common to both multipliers is rejected to first-order because the feedback multiplier essentially compensates the impairments generated in the main multiplier. The scaling factor, U, is fixed by design to 1.12 V. However, the multiplier gain, , can be adjusted by driving the GADJ pin with a voltage ranging from 0 V to 2 V. If left floating, then = 1 or 0 dB, and the overall scaling is simply U = 1 V. For VGADJ = 0 V, the gain is lowered by approximately 4 dB; for VGADJ = 2 V, the gain is raised by approximately 6 dB. Figure 5 shows the relationship between (V/V) and VGADJ.
BASIC CONNECTIONS
Multiplier Connections
The best ADL5391 performance is achieved when the X, Y, and Z inputs and W output are driven differentially; however, they can be driven single-ended. Single-ended-to-differential transformations (or differential-to-single-ended transformations) can be done using a balun or active components, such as the AD8313, the AD8132 (both with operation down to dc), or the AD8352 (for higher drive capability). If using the ADL5391 single-ended without ac coupling capacitors, the reference voltage of 2.5 V needs to be taken into account. Voltages above 2.5 V are positive voltages and voltages below 2.5 V are negative voltages. Care needs to be taken not to load the ADL5391 too heavily, the maximum reference current available is 50 mA.
Rev. 0 | Page 10 of 16
ADL5391
Matching the Input/Output
The input and output impedance's of the ADL5391 change over frequency, making it difficult to match over a broad frequency range (see Figure 15 and Figure 16). The evaluation board is matched for lower frequency operation, and the impedance change at higher frequencies causes the change in gain seen in Figure 6. If desired, the user of the ADL5391 can design a matching network to fit their application.
Wideband Voltage-Controlled Amplifier/Amplitude Modulator
Most of the data for the ADL5391 was collected by using it as a fast reacting analog VGA. Either X or Y inputs can be used for the RF input (and the other as the very fast analog control), because either input can be used from dc to 2 GHz. There is a linear relationship between the analog control and the output of the multiplier in the VGA mode. Figure 6 and Figure 7 show the dynamic range available in VGA mode (without optimizing the dc offsets). The speed of the ADL5391 in VGA mode allows it to be used as an amplitude modulator. Either or both inputs can have modulation or CW applied. AM modulation is achieved by feeding CW into X (or Y) and adding AM modulation to the Y (or X) input.
The dc component of the output is related to the square of both the offset (OFST) and the signal input amplitude (E). The offset can be found in Figure 4 and is approximately 20 mV. The second harmonic output grows with the square of the input amplitude, and the signal bleedthrough grows proportionally with the input signal. For smaller signal amplitudes, the signal bleedthrough can be higher than the second harmonic component. As the input amplitude increases, the second harmonic component grows much faster than the signal bleedthrough and becomes the dominant signal at the output. If the X and Y inputs are driven too hard, third harmonic components will also increase. For best performance creating harmonics, the ADL5391 should be driven differentially. Figure 17 shows the performance of the ADL5391 when used as a harmonic generator (the evaluation board was used with R9 and R10 removed and R2 = 56.2 ). If dc operation is necessary, the ADL5391 can be driven single ended (without the dc blocks). The flatness of the response over a broad frequency range depends on the input/output match. The fundamental bleed through not only depends on the amount of power put into the device but also depends on matching the unused differential input/output to the same impedance as the used input/output. Figure 18 shows the performance of the ADL5391 when driven single ended (without ac coupling capacitors), and Figure 19 shows the schematic of the setup. A resistive input/output match were used to match the input from dc to 1 GHz and the output from dc to 2 GHz. Reactive matching can be used for more narrow frequency ranges. When matching the input/output of the ADL5391, care needs to be taken not to load the ADL5391 too heavily; the maximum reference current available is 50 mA.
-15 -20 -25 SECOND HARMONIC GAIN
Squaring and Frequency Doubling
Amplitude domain squaring of an input signal, E, is achieved simply by connecting the X and Y inputs in parallel to produce an output of E2. The input can be single-ended, differential, or through a balun (frequency range and dynamic range can be limited if used single ended). When the input is a sine wave Esin(t), a signal squarer behaves as a frequency doubler, because
2 [Esin(t )] = E (1 - cos(2t )) 2 2
(3)
GAIN (dBm)
-30 -35 -40 -45 -50 -55 -60 THIRD HARMONIC GAIN
06059-026
Ideally, when used for squaring and frequency doubling, there is no component of the original signals on the output. Because of internal offsets, this is not the case. If Equation 3 were rewritten to include theses offsets, it could separate into three output terms (Equation 4).
BLEEDTHRU GAIN
[Esin(t ) + OFST ]x [Esin(t ) + OFST ] =
2 E2 [cos(2t )] + 2Esin(t )OFST + OFST 2 + E 2 2

(4)
-65 10 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz)
Figure 17. ADL5391 Used as a Harmonic Generator
where: The dc component is OFST2 + E2/2. The input signal bleedthrough is 2Esin(t)OFST. The input squared is E2/2[cos(2t)].
Rev. 0 | Page 11 of 16
ADL5391
0 -5 -10 -15 -20 SECOND HARMONIC GAIN BLEEDTHRU GAIN
be removed through calibration. Figure 20 shows the response of the ADL5391 as a square law detector, Figure 21 shows the error vs. the input power, and Figure 22 shows the configuration used.
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 62 0.1 0.2 0.3 0.4 VIN (V rms)2 0.5 0.6 0.7 0.8
06059-091 06059-092
GAIN (dBm)
-25 -30 -35 -40 -45 -50 -55 -60 10 100 200 300 400 500 600 700 800 900 1000
06059-027
THIRD HARMONIC GAIN
-65 FREQUENCY (MHz)
Figure 18. Single-Ended (DC) ADL5391 Used as a Harmonic Generator
5dB PAD 21 74 53 YIN 74 21 53 XM XP YM YP WP WM 150 10dB PAD
XIN
Figure 20. ADL5391 Used as Square Law Detector DC Output vs. Square of Input
200 1.6
06059-028
5dB PAD
VOUT (V)
1.4 1.2 1.0
Figure 19. Setup for Single-Ended Data
ERROR (dB)
Use as a Detector
The ADL5391 can be used as a square law detector. When amplitude squaring is performed, there are components of the multiplier output that correlate to the signal bleedthrough and second harmonic, as seen in Equation 4. However, as noted in the Squaring and Frequency Doubling section, there is also a dc component that is directly related to the offset and the squared input magnitude. If a signal is split and feed into the X and Y inputs and a low-pass filter were place on the output, the resulting dc signal would be directly related to the square of the input magnitude. The intercept of the response will shift slightly from part to part (and over temperature) with the offset, but this can
0.8 0.6 0.4 0.2 0 -0.2 -30
-25
-20
-15
-10 PIN X (dBm)
-5
0
5
10
Figure 21. ADL5391Used as a Square Law Detector Error vs. Power Input
C7 0.1F J6 YP C18 0.1F C4 0.1F J8 XP C20 0.1F T2 TC1-1-13M R1 56.2
13 11
T3
TC1-1-13M
R2 56.2
XM XP R6 24.9 WP
6
12
T1 R12 OPEN 40H 40H 45nF
74H 40nF 74H
R4 100 R5 24.9
J2 WM J1 WP
WM 5 YM YP
Figure 22. Schematic for ADL5391 Used as Square Law Detector
Rev. 0 | Page 12 of 16
06059-093
14
ADL5391 EVALUATION BOARD
C16 OPEN C7 0.1F YP J6 YM J7 C19 OPEN C4 0.1F XP J8 XM J9 C1 T2 OPEN C20 0.1F ENBL J10 R20 0 ENBL_DC TP10 2 3 1 SW1 C10 100pF C6 OPEN C18 0.1F XP_DC TP8 YP_DC TP6 R10 0 R14 0 ZP_DC TP5 C15 OPEN C8 0.1F C9 OPEN C17 0.1F R18 0 GADJ_DC TP3 GADJ J3 C14 0.1F C5 OPEN T1 C2 0.1F C13 OPEN WM J2 WP J1 ZP J5 ZM J4
TC1-1-13M
T3
R2 OPEN
R3 OPEN
TC1-1-13M
T4
YM_DC TP7 R16 OPEN
R9 0
12 YMNS
11 YPLS
10 ZPLS
9 ZMNS GADJ
R15 0
ZM_DC TP4 R19 0
13 XPLS TC1-1-13M R1 56.2 R17 OPEN 14 XMNS
8
R11 OPEN
COMM
7 R6 24.9 R4 100
R13 OPEN
XM_DC TP9 R8 OPEN
ADL5391
15 ENBL WMNS 6
WM_DC TP2
VMID TP11 C3 0.1F
R12 OPEN
TC1-1-13M
16 VMID COMM 1 VPOS 2 VPOS 3
WPLS VPOS 4
5 R5 24.9 WP_DC TP1
R7 OPEN
TP COMM TP14
TP COMM TP12
C12 0.1F
C11 4.7F
06059-025
VPOS TP13
Figure 23. ADL5391-EVALZ Evaluation Board Schematic
06059-030
Figure 24. Component Side Metal of Evaluation Board
Figure 25. Component Side Silkscreen of Evaluation Board
Rev. 0 | Page 13 of 16
06059-031
ADL5391
Table 4. Evaluation Board Configuration Options
Component J1, J5, J6, J8 Function SMA connectors for single-ended, high frequency operation. If J5 and J6 are used, R9, R10, R14, and R15 should be removed. R2 and R3 should also be populated to match the inputs. If used in broadband operation, C4, C7, C8, and C2 need to be replaced with 0 resistors. SMA connectors for broadband differential operation. If these are used, baluns should be removed and jumped over using 0 resistors, and C14, C15, C18, and C20 should be removed. SMA connector for connection to GADJ. Single-ended-to-differential transformation for high frequency ac operation. If dc operation is necessary, the baluns can be removed and jumped over using 0 resistors. DC block capacitors. Not installed, dc block capacitors. Snubbing resistors. Snubbing resistors. Snubbing resistors. Filter capacitor. Filter capacitor. Filter capacitor. Filter capacitor. Matching resistor. Matching resistors. Input impedance to X, Y, and Z inputs are the same. For the same frequency, R1, R2, and R3 should be the same. Matching resistor.s Matching resistor. Can be used for voltage divider or filtering. Enable switch: enable = 5 V, disable = 0 V. Green test loop. Part Number Default Value WP, ZP, YP, XP
J2, J4, J7, J9
WM, ZM, YM, XM
J3 T1, T2, T3, T4
TC1-1-13M+ Mini-Circuits
C2, C4, C7, C8, C14, C17, C18, C20 C1, C5, C6, C9, C13, C15, C16, C19 R9, R10, R14, R15, R18 R19, R20 R7, R13, R16, R17 C10 C12 C3 C11 R1 R2, R3, R12 R5, R6 R4 R8, R11 SW1 TP1, TP2, TP4, TP5, TP6, TP7, TP8, TP9 TP13 TP12, TP14 TP3, TP10, TP11 DUT
GADJ T3 and T4 are populated, but the Y and Z inputs are set up for dc operation. 0.1 F, 0402 capacitors Open, 0402 capacitors 0 , 0402 resistors 0 , 0603 resistors Open, 0402 resistors 100 pF, 0402 capacitor 0.1 F, 0402 capacitor 0.1 F, 0603 capacitor 4.7 F, 3216 capacitor 56.2 , 0603 resistor Open, 0603 resistors 24.9 , 0402 resistors 100 , 0603 resistor Open, 0603 resistors SW1 installed WP_DC, WM_DC, ZM_DC, ZP_DC, YP_DC, YM_DC, XP_DC, XM_DC VPOS COMM GADJ_DC, ENBL_DC, VMID
Red test loop. Black test loops. Yellow test loops. ADL5391.
ADL5391ACPZ
Rev. 0 | Page 14 of 16
ADL5391 OUTLINE DIMENSIONS
3.00 BSC SQ 0.45 PIN 1 INDICATOR TOP VIEW 2.75 BSC SQ 0.50 BSC 12 MAX 0.90 0.85 0.80 SEATING PLANE 0.30 0.23 0.18 0.80 MAX 0.65 TYP 0.05 MAX 0.02 NOM 0.20 REF 1.50 REF 0.60 MAX 0.50 0.40 0.30
PIN 1 INDICATOR
*1.65 1.50 SQ 1.35
13 12
16
EXPOSED PAD
1
9 (BOTTOM VIEW) 4 8 5
0.25 MIN
*COMPLIANT TO JEDEC STANDARDS MO-220-VEED-2 EXCEPT FOR EXPOSED PAD DIMENSION.
Figure 26. 16-Lead Lead Frame Chip Scale Package [LFCSP_VQ] 3 mm x 3 mm Body, Very Thin Quad (CP-16-3) Dimensions shown in millimeters
ORDERING GUIDE
Model ADL5391ACPZ-R2 1 ADL5391ACPZ-R71 ADL5391ACPZ-WP1 ADL5391-EVALZ1
1
Temperature Range -40C to +85C -40C to +85C -40C to +85C
Package Description 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ Evaluation Board
Package Option CP-16-3 CP-16-3 CP-16-3
Ordering Quantity 250 1,500 50 1
Z = Pb-free part.
Rev. 0 | Page 15 of 16
ADL5391 NOTES
(c)2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06059-0-7/06(0)
T T
Rev. 0 | Page 16 of 16

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