Initial configuration for ADL5240 Evaluation kit

Question

Hi, 
 We are using ADL5240 evaluation kit to verify VGA performance/functionality. 
 What is the initial configuration or steps need to be followed to verify variation in signal power as we vary attenuation through GUI application? 
 I am feeding input to AMP IN and taking output from DSA OUT. Is this correct for AMP-DSA loop configuration?

rachana.kaza@analog.com · Accepted Answer

HI, 
 
 For the initial configuration or steps need to be followed to verify variation in signal power as we vary attenuation through GUI application 
 Equipment required : 
 
 Voltage supply/supplies capable of delivering:
 
 +5 V 1 A

One RF signal generator capable of generating up to 4000 MHz @ 0 dBm. 
 One RF signal analyzer capable of analyzing up to 4000MHz

Calibration 
 
 Set the RF Source to 2140MHz and the output power to 0dBm.
 
 Connect the signal generator and the spectrum analyzer as shown in Figure 2 but replace DUT with a &ldquo;thru&rdquo;. (Center 2140MHz, Span 1MHz, Attenuation Auto, Ref Level +30dBm, Resolution Bandwidth Auto, Marker at 2140MHz) 
 Turn the signal generator output on 
 Place a spectrum analyzer marker on 2140MHz and measure the power. It would be best to hit the spectrum analyzer peak search button due to slight frequency offsets between the signal generator and spectrum analyzer 
 Record this value, this is the correction factor for cable loss 
 Turn off the generator

Test Setup 1: AMP 
 
 Connect a +5V DC supply between VCC and GND3 test loops
 
 Set Voltage limit to 5V and Current limit to 1A 
 Turn on DC supply, the device should draw 89 &plusmn; 8mA

On the RF source set the power to -20dBm, the frequency should be 2140MHz, and turn it on 
 The spectrum analyzer should already be on (Ref Level +30dBm). On the spectrum analyzer, place a marker on the signal at 2140MHz. It would be best to hit the spectrum analyzer peak search button due to slight frequency offsets between the signal generator and spectrum analyzer. 
 Measure the output power on the marker. 
 Subtract the correction factor obtained from step 1d from the measured output power. (For example: if Pout is 10dBm and the correction factor is -0.5dBm, the Pout corrected is 
 
 10dBm &minus; (&minus;0.5dBm) = 10.5dBm). 
 
 Verify the corrected output power obtained from step 6 is between &ndash;2.5dBm and 1.5dBm

Test Setup 2: DSA 
 Parallel Mode 
 
 Set switch S1 to VDD (the raised part should be towards the right) 
 Connect evaluation board to a PC through USB cable 
 Use the control software provided to control the DSA (see Table 2 for pin description) 
 Connect a +5V DC supply between VDD and GND1 test loops
 
 Set Voltage limit to 5V and Current limit to 1A 
 Turn on DC supply, the device should draw less than 0.5mA

Connect the RF Source and Spectrum analyzer as shown in Figure 3 
 On the RF source set the power to 0dBm, the frequency should be 2140MHz, and turn it on 
 The spectrum analyzer should already be on (Ref Level +30dBm). On the spectrum analyzer, place a marker on the signal at 2140MHz. It would be best to hit the spectrum analyzer peak search button due to slight frequency offsets between the signal generator and spectrum analyzer. 
 If using the software provided Figure4, click on the ADL5240 icon created on the desktop
 
 Select the parallel mode option 
 Configure the preset modes for 0dB, 0.5dB, 1dB, 2dB, 4dB, 8dB, 16dB and 31.5dB

On the spectrum analyzer measure the output power after clicking each preset mode, record the output power 
 Subtract the correction factor obtained from step 1d from the measured output power recorded above. (For example: if Pout is 10dBm and the correction factor is -0.5dBm, the Pout corrected is 10dBm&minus;(&minus;0.5dBm) = 10.5dBm) 
 Verify the corrected output power obtained from step 17 is as shown in Table 1 below 
 
 Serial Mode 
 
 Set switch S1 to GND (the raised part should be towards the left) 
 Connect evaluation board to a PC through USB cable 
 Use the control software provided to control the DSA (see Table3 for pin description) 
 Connect a +5V DC supply between VDD and GND1 test loops
 
 Set Voltage limit to 5V and Current limit to 1A 
 Turn on DC supply, the device should draw less than 0.5mA

Connect the RF Source and Spectrum analyzer as shown in Figure 3 
 On the RF source set the power to 0dBm, the frequency should be 2140MHz, and turn it on 
 The spectrum analyzer should already be on (Ref Level +30dBm). On the spectrum analyzer, place a marker on the signal at 2140MHz. It would be best to hit the spectrum analyzer peak search button due to slight frequency offsets between the signal generator and spectrum analyzer. 
 If using the software provided Figure4, click on the ADL5240 icon created on the desktop
 
 Select the serial mode option 
 Configure the preset modes for 0dB, 0.5dB, 1dB, 2dB, 4dB, 8dB, 16dB and 31.5dB

On the spectrum analyzer measure the output power after clicking each preset mode, record the output power 
 Subtract the correction factor obtained from step 1d from the measured output power recorded above. (For example: if Pout is 10dBm and the correction factor is -0.5dBm, the Pout corrected is 10dBm&minus;(&minus;0.5dBm) = 10.5dBm) 
 Verify the corrected output power obtained from step 28 is as shown in Table 1 table below 
 
 Table 1. Pout vs Attenuation State

Attenuation State

Pout (dB)

Tolerance

0

-2.5

&plusmn;0.5

0.5

-3.0

&plusmn;0.5

1.0

-3.5

&plusmn;0.5

2.0

-4.5

&plusmn;0.5

4.0

-6.5

&plusmn;0.5

8.0

-10.5

&plusmn;0.5

16.0

-18.5

&plusmn;0.5

31.5

-34.0

&plusmn;0.5

Table 2. Parallel Mode

Parallel Mode

Pin 1

D6

Data Bit (LSB)

Pin 2

D1

Data Bit (MSB)

Pin 3

D3

Data Bit

Pin 4

GND

Connect to GND

Pin 5

D5

Data Bit

Pin 6

D0

Connect to GND

Pin 7

D2

Data Bit

Pin 8

D4

Data Bit

Pin 9

GND

Connect to GND

Table 3. Serial Mode

Serial Mode

Pin 1

D6

Connect to Supply

Pin 2

D1

DATA

Pin 3

D3

Connect to GND

Pin 4

GND

Connect to GND

Pin 5

D5

Connect to GND

Pin 6

D0

CLK

Pin 7

D2

LE

Pin 8

D4

Connect to GND

Pin 9

GND

Connect to GND

With regard to the AMP-DSA loop configuration 
 From the datasheet under the Evaluation board section on Page 23, The EVB needs to be configured in the AMP-DSA loop as shown in below. Can you please confirm on this? 
 &ldquo;The evaluation board can be configured to handle either option. In normal operation, R12 and R13 are open, and R10 and R11 are 0 &Omega; and are used to terminate any RF coupling onto the bypass trace. To configure the ADL5240 in AMP-DSA loop configuration, R12 should be replaced with a capacitor, R13 should be replaced with a 0 &Omega; resistor, and R10 and R11 should be left open.&rdquo; 
 
 Hope this helps. 
 
 Warm Regards, 
 Rachana)