EVAL-CN0187-SDPZ Analog Devices Inc, EVAL-CN0187-SDPZ Datasheet - Page 5

• Manufacturer Part Number: EVAL-CN0187-SDPZ
• Description: BOARD, EVAL, FOR CN0187
• Manufacturer: Analog Devices Inc
• Series: -r

Specifications of EVAL-CN0187-SDPZ

• Rohs Compliant: YES
• Svhc: No SVHC (15-Dec-2010)
• Main Purpose: Measurement, RF Power
• Embedded: No
• Utilized Ic / Part: ADA4891-4, ADL5502, ADP121, AD7266
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Circuit Note
Next, the CW reference level of PEAK, V
using V
incoming waveform was a CW signal).
Finally, the actual level of PEAK, V
the CF can be calculated as
where V
V
as shown in Figure 11 with the CW signal (taken from the
ADL5502 data sheet). Across the dynamic range, the calculated
CF hovers about the 0 dB line. Likewise, for complex waveforms
of 3 dB, 6 dB, and 9 dB CFs, the calculations accurately hover
about the corresponding CF levels.
PEAK-UNKNOWN
V
V
VRMS-UNKNOWN
PEAK-UNKNOWN
V
CF = 20 log
PEAK-CW
10
–1
V
IN
9
8
7
6
5
4
3
2
1
0
PEAK-CW
PEAK-CW
–25
Figure 11. Reported Crest Factor of Various Waveforms
(that is, the output voltage that would be seen if the
Figure 10. Procedure for Crest Factor Calculation
. If both V
= (V
–20
is used as a reference point to compare
0
10
3
2
IN
(V
2-TONE WAVEFORM, 3dB CF
8-TONE WAVEFORM, 9dB CF
4-TONE WAVEFORM, 6dB CF
Gain
PEAK-UNKNOWN
–15
PEAK
PEAK
CW, 0dB CF
V
–10
IN
values are equal, then the CF is 0 dB,
1
) + Intercept
INPUT (dBm)
INPUT (V rms)
/V
–5
PEAK-UNKNOWN
PEAK-CW
PEAK OF
UNKNOWN WAVEFORM
0
VRMS OF
UNKNOWN WAVEFORM
(RESULT INDEPENDENT
OF WAVEFORM)
PEAK
PEAK-CW
)
PEAK OF
CW, CF = 0dB
5
, is measured and
, is calculated
(6)
(5)
10
15
Rev. 0| Page 5 of 7
The performance of this or any high speed circuit is highly
dependent on proper PCB layout. This includes, but is not
limited to, power supply bypassing, controlled impedance lines
(where required), component placement, signal routing, and
power and ground planes. (See
and article,
Board
layout.)
A complete design support package for this circuit note can be
found at
COMMON VARIATIONS
For applications that require less RF detection range, the
AD8363
range of 50 dB and operates at frequencies up to 6 GHz. For
non-rms detection applications, the
or
ranges and have varying input frequency ranges up to 10 GHz
(see
CIRCUIT EVALUATION AND TEST
This circuit uses the EVAL-CN0187-SDPZ circuit board and the
EVAL-SDP-CB1Z System Demonstration Platform (SDP)
evaluation board. The two boards have 120-pin mating
connectors, allowing for the quick setup and evaluation of the
circuit’s performance. The EVAL-CN0187-SDPZ board contains
the circuit to be evaluated, as described in this note, and the
SDP evaluation board is used with the CN0187 evaluation
software to capture the data from the EVAL-CN0187-SDPZ
circuit board.
Figure 12. Measured Crest Factor of CW Signals vs. Input Level, 450 MHz,
ADL5513
CN-0150
–0.5
–1.0
Layout, for more detailed information regarding PCB
3.0
2.5
2.0
1.5
1.0
0.5
0
–25
900 MHz, 1900 MHz, 2350 MHz, 2600 MHz, Supply +3.3 V
http://www.analog.com/CN0187-DesignSupport.
rms detector can be used. The AD8363 has a detection
A Practical Guide to High-Speed Printed-Circuit-
can be used. These devices offer varying detection
for more details).
–15
INPUT (dBm)
MT-031 Tutorial, MT-101 Tutorial,
450MHz
900MHz
1900MHz
2350MHz
2600MHz
–5
AD8317/AD8318/AD8319
5
CN-0187
15