Analog Devices EVAL-ADAQ8088EBZ User manual

EVAL-ADAQ8088EBZ User Guide
UG-1825
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluating the ADAQ8088 Dual-, Differential, Low-Pass Filter μModule
with Gain and ADC Driver
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 12
FEATURES
3 common signal processing and conditioning blocks, a
preamplifier, an 8-pole filter, and an ADC driver integrated
to support a variety of demodulator applications
No external components required for proper operation
EVALUATION KIT CONTENTS
EVAL-ADAQ8088EBZ evaluation board
EQUIPMENT NEEDED
Bench supply of 2.7 V to 3.3 V
SMA cables
4-Port or 2-port network analyzer
AD9681-125EBZ evaluation kit
HSC-ADC-EVALEZ evaluation kit
Keysight 33600A generator
Allen Avionics LPF #F3056-7P7 (2 pieces)
PC running Windows®
GENERAL DESCRIPTION
The EVAL-ADAQ8088EBZ evaluates the ADAQ8088 and requires
a 2.7 V to 3.3 V power supply for proper operation. The EVAL-
ADAQ8088EBZ accepts baseband differential in-phase/quadrature
(I/Q) inputs via Subminiature A (SMA)connectors (Jx) and
drives pipeline analog-to-digital converters (ADCs) via SMA
output connectors. The EVAL-ADAQ8088EBZ contains the
ADAQ8088 μModule, which is a dual-channel analog system in
package (SIP) that integrates three common signal processing
and conditioning blocks to support a variety of demodulator
applications and data acquisition applications. The device
integrates all active and passive components to form a complete
signal chain between the output of an I/Q demodulator and the
input to an ADC. For full details on the ADAQ8088, see the
ADAQ8088 data sheet, which must be consulted in conjunction
with this user guide when using the EVAL-ADAQ8088EBZ.
EVAL-ADAQ8088EBZ PHOTOGRAPH
Figure 1.
25399-001
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UG-1825 EVAL-ADAQ8088EBZ User Guide
Rev. 0 | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents................................................................... 1
Equipment Needed........................................................................... 1
General Description ......................................................................... 1
EVAL-ADAQ8088EBZ Photograph............................................... 1
Revision History ............................................................................... 2
Evaluation Board Hardware............................................................ 3
Setting Up the Evaluation Board................................................ 3
Analog Inputs................................................................................ 3
Magnitude and Phase Response Measurements Using A Four-
Port Network Analyzer .................................................................... 4
Measuring the Magnitude and Phase of the I-Channel .......... 4
Measuring the Magnitude and Phase of the Q-Channel......... 4
Calibration Procedure.................................................................. 4
Magnitude and Frequency Response Measurements Using A
Two-Port Network Analyzer........................................................... 5
Measuring the Magnitude and Frequency Response of the I-
Channel...........................................................................................5
Measuring the Magnitude and Frequency Response of the Q-
Channel...........................................................................................6
Calibration Procedure ..................................................................6
Evaluating the ADAQ8088 by Driving the AD9681 ADC ..........7
Configuring the EVAL-ADAQ8088EBZ, AD9681-125EBZ,
and HSC-ADC-EVALEZ...............................................................7
Measurement Results when Driving the AD9681 Using the
ADAQ8088 as a Driver.................................................................7
Troubleshooting Tips....................................................................8
Evaluation Board Schematics and Artwork...................................9
Ordering Information.................................................................... 12
Bill of Materials........................................................................... 12
REVISION HISTORY
3/2021—Revision 0: Initial Version
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EVAL-ADAQ8088EBZ User Guide UG-1825
Rev. 0 | Page 3 of 12
EVALUATION BOARD HARDWARE
SETTING UP THE EVALUATION BOARD
Figure 2 shows the simplified EVAL-ADAQ8088EBZ block
diagram. The ADAQ8088 μModule that is soldered to the
EVAL-ADAQ8088EBZ requires a supply voltage from 2.7 V to
3.3 V. The EVAL-ADAQ8088EBZ allows the user to set the
I_OUT_VOCM pin and Q_OUT_VOCM pin of the EVAL-
ADAQ8088EBZ through the EXVCMA and EXVCMB jumpers.
ANALOG INPUTS
The EVAL-ADAQ8088EBZ I inputs (I_INP and I_INN) are
connected through the J1 and J2 SMA connectors, respectively,
and the Q inputs (Q_INP and Q_INN) are connected through
the J4 and J3 SMA connectors, respectively.
Table 1. Jumper Details with Factory Default Settings
Link Default Function Comment
P1 Not
populated
VS+ ADAQ8088 supply.
P2 Not
populated
EXVCMA Connect EXVCMA to the
common-mode output of the
ADC I-channel. This jumper
can also be left floating.
P3 Not
populated
EXVCMB Connect EXVCMB to the
common-mode output of the
ADC Q-channel. This jumper
can also be left floating.
Note that the I-channel and the Q-channel correspond to
Channel A and Channel B, respectively, of the ADAQ8088
data sheet.
Figure 2. Simplified EVAL-ADAQ8088EBZ Block Diagram
+
+
–
–+
+
–
–
VCC I_OUT_RGP I_OUT_RFN
I_OUT_RFP
I_OUT_RGN
Q_OUT_RFP
Q_OUT_RGN
I_OUT_V
OCM
Q_OUT_V
OCM
Q_IN_V
OCM
J4
J3
+
+
–
–+
+
–
–
Q_OUT_RGN Q_OUT_RFPGND
J8
J6
J1
J2
Q_INP
Q
_INN
I_INP
I_INN
Q_OUTP
Q_OUTN
I_OUTP
I_OUTN
J7
J5
EXVCMA
GND
P2
EXVCMB
GND
P3
VS+
GND
P1
25399-002
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UG-1825 EVAL-ADAQ8088EBZ User Guide
Rev. 0 | Page 4 of 12
MAGNITUDE AND PHASE RESPONSE MEASUREMENTS USING A FOUR-PORT
NETWORK ANALYZER
MEASURING THE MAGNITUDE AND PHASE OF
THE I-CHANNEL
To measure the magnitude and phase of the I-channel using a
four-port network analyzer (see Figure 3), take the following
steps:
1. Use an SMA cable to connect J1 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2. Use an SMA cable to connect J2 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
3. Use an SMA cable to connect J7 of the EVAL-
ADAQ8088EBZ to Port 3 of the network analyzer.
4. Use an SMA cable to connect J5 of the EVAL-
ADAQ8088EBZ to Port 4 of the network analyzer.
5. Set the network analyzer output, Port 1 and Port 2, to a
power level of −20 dBm (63 mV p-p).
6. Observe the output phase on Port 3 and Port 4 of the
network analyzer.
Figure 3. Four-Port Network Analyzer (E5071C Model)
MEASURING THE MAGNITUDE AND PHASE OF
THE Q-CHANNEL
To measure the magnitude and phase of the Q-channel using
a four-port network analyzer (see Figure 3), take the following
steps:
1. Use an SMA cable to connect J4 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2. Use an SMA cable to connect J3 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
3. Use an SMA cable to connect J8 of the EVAL-
ADAQ8088EBZ to Port 3 of the network analyzer.
4. Use an SMA cable to connect J6 of the EVAL-
ADAQ8088EBZ to Port 4 of the network analyzer.
5. Set the network analyzer output, Port 1 and Port 2, to a
power level of −20 dBm (63 mV p-p).
6. Observe the output phase on Port 3 and Port 4 of the
network analyzer.
CALIBRATION PROCEDURE
First ensure that the four-port network analyzer is calibrated
using either the ECal (electronic calibration) module, or the
manual short, open, and load method. When the network
analyzer is calibrated using one of these two methods, take
the following steps to complete the network analyzer through
calibration:
1. Use an SMA cable to connect a through connector from
Port 1 to Port 3 of the network analyzer.
2. Use an SMA cable to connect a through connector from
Port 2 to Port 4 of the network analyzer.
3. Press the Cal button on the network analyzer.
4. Click Calibrate > Response (Thru) > Select Ports on
the network analyzer, and then take the following steps
to start calibration:
a. Select 3-1 and click Thru on the network analyzer
to start the calibration on Port 3 and Port 1.
b. When the calibration on Port 3 and Port 1 is
complete, select 4-2 and click Thru on the network
analyzer to start calibration on Port 4 and Port 2.
5. Use an SMA cable to connect a through connector from
Port 1 to Port 4 of the network analyzer.
6. Use an SMA cable to connect a through connector from
Port 2 to Port 3 of the network analyzer.
7. Press the Cal button on the network analyzer.
8. Click Calibrate > Response (Thru) > Select Ports on
the network analyzer, and then take the following steps
to start calibration:
a. Select 4-1 and click Thru on the network analyzer
to start the calibration on Port 4 and Port 1.
b. When the calibration on Port 4 and Port 1 is
complete, select 3-2 and click Thru on the network
analyzer to start calibration on Port 3 and Port 2.
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EVAL-ADAQ8088EBZ User Guide UG-1825
Rev. 0 | Page 5 of 12
MAGNITUDE AND FREQUENCY RESPONSE MEASUREMENTS USING A TWO-PORT
NETWORK ANALYZER
MEASURING THE MAGNITUDE AND FREQUENCY
RESPONSE OF THE I-CHANNEL
I_INP as the Active Input
To measure the magnitude and frequency response of the I-
channel with the I_INP input as the active input and using a
two-port network analyzer (see Figure 4), take the following
steps:
1. Use an SMA cable to connect J1 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2. Leave J2 of the EVAL-ADAQ8088EBZ floating.
3. To measure the frequency response at the I_OUTP
output of the EVAL-ADAQ8088EBZ, take the following
steps:
a. Use an SMA cable to connect J7 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
b. Terminate J5 to 50 Ω.
c. Set the network analyzer output, Port 1, to a power
level of −20 dBm.
d. Observe the frequency response on Port 2 of the
network analyzer.
4. To measure the frequency response at the I_OUTN
output of the EVAL-ADAQ8088EBZ, take the following
steps:
a. Use an SMA cable to connect J5 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
b. Terminate J7 to 50 Ω.
c. Set the network analyzer output, Port 1, to a power
level of −20 dBm.
d. Observe the frequency response on Port 2 of the
network analyzer.
I_INN as the Active Input
To measure the magnitude and frequency response of the I-
channel with the I_INN input as the active input and using a
two-port network analyzer (see Figure 4), take the following
steps:
1. Use an SMA cable to connect J2 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2. Leave J1 of the EVAL-ADAQ8088EBZ floating.
3. To measure the frequency response at the I_OUTP and
I_OUTN outputs of the EVAL-ADAQ8088EBZ, repeat
Step 3 and Step 4 of the procedure in the I_INP as the
Active Input section.
Figure 4. Two-Port Network Analyzer (E5071 Model)
25399-005
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UG-1825 EVAL-ADAQ8088EBZ User Guide
Rev. 0 | Page 6 of 12
MEASURING THE MAGNITUDE AND FREQUENCY
RESPONSE OF THE Q-CHANNEL
Q_INP as the Active Input
To measure the magnitude and frequency response of the Q-
channel with the Q_INP input as the active input and using a
two-port network analyzer (see Figure 4), take the following
steps:
1. Use an SMA cable to connect J4 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2. Leave J3 of the EVAL-ADAQ8088EBZ floating.
3. To measure the frequency response at the Q_OUTP
output of the EVAL-ADAQ8088EBZ, take the following
steps:
a. Use an SMA cable to connect J8 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
b. Terminate J6 to 50 Ω.
c. Set the network analyzer output, Port 1, to a power
level of −20 dBm.
d. Observe the frequency response on Port 2 of the
network analyzer.
4. To measure the frequency response at the Q_OUTP
output of the EVAL-ADAQ8088EBZ, take the following
steps:
a. Use an SMA cable to connect J6 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
b. Terminate J8 to 50 Ω.
c. Set the network analyzer output, Port 1, to a power
level of −20 dBm.
d. Observe the frequency response on Port 2 of the
network analyzer.
Q_INN as the Active Input
To measure the magnitude and frequency response of the Q-
channel with the Q_INN input as the active input and using a
two-port network analyzer (see Figure 4), take the following
steps:
1. Use an SMA cable to connect J3 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2. Leave J4 of the EVAL-ADAQ8088EBZ floating.
3. To measure the frequency response at the Q_OUTP and
Q_OUTN outputs of the EVAL-ADAQ8088EBZ, repeat
Step 3 and Step 4 of the procedure in the Q_INP as the
Active Input section.
CALIBRATION PROCEDURE
First ensure that the two-port network analyzer is calibrated
using either the ECal (electronic calibration) module, or the
manual short, open, and load method. When the network
analyzer is calibrated using one of these two methods, take
the following steps to complete the network analyzer through
calibration:
1. Use an SMA cable to connect a through connector from
Port 1 to Port 2 of the network analyzer.
2. Press the Cal button on the network analyzer.
3. Click Calibrate > Response (Thru) > Select Ports on
the network analyzer.
4. Select 2-1, and click Thru.
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EVAL-ADAQ8088EBZ User Guide UG-1825
Rev. 0 | Page 7 of 12
EVALUATING THE ADAQ8088 BY DRIVING THE AD9681 ADC
CONFIGURING THE EVAL-ADAQ8088EBZ,
AD9681-125EBZ, AND HSC-ADC-EVALEZ
Before using the software for testing, take the following steps
to configure the EVAL-ADAQ8088EBZ, AD9681-125EBZ,
and HSC-ADC-EVALEZ:
1. Take the following steps to modify the EVAL-
ADAQ8088EBZ:
a. Remove the R5, R6, R7, and R8 resistors.
b. Install a 40 Ω resistor on R5, R6, R7, and R8.
2. Take the following steps to modify the AD9681-125EBZ
(FMC connector version) of each channel selected (Figure 6
shows Channel A1 and Channel A2 selected for use):
a. Install an SMA connector on the J102 and J104
ports.
b. Remove the R14, R16, C3, C4, J6, J7, C7 to C10,
R36, to R39, and T17 to T20.
c. Install a 0 Ω resistor on R321, R415, C3, C4, J6, J7,
C7 to C10, and R36 to R39.
d. Connect a jumper wire from Pin 3 to Pin 4 of T1.
e. Connect a jumper wire from Pin 1 to Pin 6 of T1.
f. Connect a jumper wire from Pin 3 to Pin 4 of T2.
g. Connect a jumper wire from Pin 1 to Pin 6 of T2.
3. Connect the EVAL-ADAQ8088EBZ to the AD9681-
125EBZ, as shown in Figure 6, and then connect the
AD9681-125EBZ to the HSC-ADC-EVALEZ by aligning
each of their field programmable gate array mezzanine
card (FMC) connector and carefully press them together.
Note that FMC connectors often come from the factory
with a sticker that prevents connection. Remove this sticker
(if needed) before attempting to make the connection.
4. On the EVAL-ADAQ8088EBZ, confirm that the jumpers
are installed as shown in Figure 8.
5. Connect one 6 V, 2.5 A switching power supply (such as
the CUI, Inc., EPS060250UH-PHP-SZ supplied in the
AD9681-125EBZ evaluation kit) to the AD9681-125EBZ.
6. Connect the 12 V, 3.3 A switching power supply to the
HSC-ADC-EVALEZ board.
7. Connect the HSC-ADC-EVALEZ to the PC using a USB
cable (supplied in the HSC-ADC-EVALEZ evaluation kit).
8. On the EVAL-ADAQ8088EBZ, replace the value of R5,
R6, R7, and R8 with 40 Ω each and use a clean signal
generator with low phase noise to provide an input signal.
9. Connect the output signal from either J5 and J7 or J6
and J8 to the selected channel of the AD9681-125EBZ.
MEASUREMENT RESULTS WHEN DRIVING THE
AD9681 USING THE ADAQ8088 AS A DRIVER
The configurations of the EVAL-ADAQ8088EBZ and the
AD9681-125EBZ used during testing include the following:
 The input source dual-channel generator (Keysight
33600A differential signal generator) is set to 6 MHz,
52 mV p-p for −1 dbFS.
 The input filter (Allen Avionics low-pass filter (LPF),
F3056-7P7) is set to a 7.7 MHz cutoff frequency. Another
LPF can be selected with a cutoff frequency above the input
frequency and below the first harmonic.
 The I-channel and Q-channel are driven and measured
(refer to Figure 6). A sample FFT of the measurement is
shown in Figure 5.
 The output loading is configured as follows:
 10 Ω internal to μModule.
 40 Ω on the EVAL-ADAQ8088EBZ.
 33 Ω and 5 pF LPF on the EVAL-ADAQ8088EBZ
(still allows for optimization).
For details on the correct EVAL-ADAQ8088EBZ jumper
positions, modes of operation, and using the ADC data
capture software for testing, see the AD9681-125EBZ user
guide page at https://wiki.analog.com/resources/eval/ad9681-
125ebz.
Figure 5. Fast Fourier Transform (FFT) Result
25399-008
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UG-1825 EVAL-ADAQ8088EBZ User Guide
Rev. 0 | Page 8 of 12
Figure 6. EVAL-ADAQ8088EBZ, AD9681-125EBZ, and HSC-ADC-EVALEZ Connections
TROUBLESHOOTING TIPS
If the FFT appears normal but the performance is poor, check
for the following:
 Ensure that the output signal of the ADAQ8088 is clean
(low phase noise).
 Ensure that the connection between the output of the
EVAL-ADAQ8088EBZ to the AD9681-125EBZ is tight.
Using a smaller length of cable or connector is
recommended.
 Ensure that an appropriate filter is used on the analog input.
 Ensure that the signal generator for the clock is clean
(low phase noise).
 Slightly change the analog input frequency if
noncoherent sampling is used.
 Ensure that the SPI configuration file matches the device
being evaluated.
For further details on troubleshooting while evaluating
the ADAQ8088 by driving the AD9681 ADC, see the
AD9681-125EBZ user guide page at
https://wiki.analog.com/resources/eval/ad9681-125ebz.
2
5399-006
3V BENCH
SUPPLY
EVAL-ADAQ8088EBZ
AD9681-125EBZ
HSC-ADC-EVALEZ
LPF
DIFFERENTIAL
SIGNAL
GENERATOR
1
2LPF
SIGNAL GENERATOR
OPTIONAL
CLOCK SOURCE
PC RUNNING
VISUAL ANALOG
AND SPI CONTROLLER
USER SOFTWARE
SWITCHING
POWER SUPPLY
WALL OUTLET
100V AC TO 240V AC
47Hz TO 63Hz
6V
12V
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EVAL-ADAQ8088EBZ User Guide UG-1825
Rev. 0 | Page 9 of 12
EVALUATION BOARD SCHEMATICS AND ARTWORK
Figure 7. EVAL-ADAQ8088EBZ Schematic
Figure 8. EVAL-ADAQ8088EBZ Feedback Resistor/Capacitor Placeholders
Figure 9. EVAL-ADAQ8088EBZ Top Copper Layer
A12
VS+
RA21
A13 RA22
A1 VINAP
C1 VINAN
C12 RA11
C13
2
1
345
RA12
A9 VCMA
F9 VCMB
F12 RB21
F13 RB22
A14
VOUTAP C14
VOUTAN
D14
VOUTBP F14
VOUTBN
D1 VINBP
F1 VINBN
D12 RB11
D13 RB12
A4 GND A7 GND A8 GND B1 GND B2 GND B3 GND B4 GND B5 GND
AGND
AGND
VCMA
EXVCMA
BLU
AGND2
BLK
P2
69157–102HLF
AGND
AGND
AGND
AGND
AGND
AGND
I–CHANNEL
SMA–J–P–H–ST–EM1
SMA–J–P–H–ST–EM1
SMA–J–P–H–ST–EM1
SMA–J–P–H–ST–EM1
Q–CHANNEL
B6 GND B7 GND B8 GND B9 GND
B10 GND B11 GND B12 GND B13 GND B14 GND
E1 GND E2 GND E3 GND E4 GND E5 GND E6 GND E7 GND E8 GND E9 GND
E10 GND E11 GND E12 GND E13 GND E14 GND
F4 GND F7 GND F8 GND
C4
VCC C5 VCC C6 VCC C7 VCC C8 VCC C9 VCC C10 VCC D4 VCC D5 VCC D6 VCC D7 VCC D8 VCC D9 VCC D10 VCC
A2 DNC A3 DNC A5 DNC A6 DNC
A10 DNC A11 DNC
C2 DNC C3 DNC
C11 DNC
D2 DNC D3 DNC
D11 DNC
F2 DNC F3 DNC F5 DNC F6 DNC
F10 DNC F11 DNC
R14
0
2
1
345
R13 I_INP
I_INN
R1
J1
J2
2
1
345
R15
0
R16
1
0
Q_INP
Q_INN
J4
2
1
345
J3
R3
0
61.9Ω
61.9Ω
R4
R2
61.9Ω
61.9Ω
INPU
T
COMMON-MODE VOLTAGE (VCM) POWER SUPPLY
5
1
432
AGND
AGND
AGND
AGND
I–CHANNEL
SMA–J–P–H–ST–EM1
SMA–J–P–H–ST–EM1
SMA–J–P–H–ST–EM1
SMA–J–P–H–ST–EM1
Q–CHANNEL
R6
0
5
1
432
R5I_OUTP
I_OUTN
J7
J5
5
1
432
R7
0
R8
0
Q_OUTP
Q_OUTN
J8
5
1
432
J6
0
OUTPUT
2
AGND
VCMB
EXVCMB
BLU
AGND3
BLK
P3
69157–102HLF
1
2
AGND
VCMB
VS+
RED
AGND1
BLK
P1
69157–102HLF
1
2
10µFC1
25399-024
R9 DNI
RA21 RA221kΩ
C2
0.1µF
R10DNI
DNI
DNI
RA11 RA121kΩ
C3
0.1µF
R11DNI
RB21 RB221kΩ
C4
0.1µF
R12DNI
DNI
DNI
RB11 RB121kΩ
C5
0.1µF
25399-025
25399-026
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UG-1825 EVAL-ADAQ8088EBZ User Guide
Rev. 0 | Page 10 of 12
Figure 10. EVAL-ADAQ8088EBZ GND Plane
Figure 11. EVAL-ADAQ8088EBZ Power Plane
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25399-028
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