EVAL-CN0187-SDPZ Analog Devices Inc, EVAL-CN0187-SDPZ Datasheet - Page 3

• 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
Typical measured performance characteristics of the circuit are
presented in Figure 2 through Figure 5.
Figure 3. Measured VRMS Output vs. Input Level (Linear Scale), 450 MHz,
Figure 2. Measured VRMS Output vs. Input Level (Log Scale), 450 MHz,
Figure 4. Measured PEAK Output vs. Input Level (Log Scale), 450 MHz,
0.01
0.01
0.1
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.1
10
10
–25
900 MHz, 1900 MHz, 2350 MHz, 2600 MHz, Supply +3.3 V
1
1
–25
900 MHz, 1900 MHz, 2350 MHz, 2600 MHz, Supply +3.3 V
0
900 MHz, 1900 MHz, 2350 MHz, 2600 MHz, Supply +3.3 V
0
–20
–20
0.2
–15
–15
–10
–10
0.4
INPUT (V rms)
INPUT (dBm)
INPUT (dBm)
–5
–5
0.6
0
0
450MHz
900MHz
1900MHz
2350MHz
2600MHz
450MHz
900MHz
1900MHz
2350MHz
2600MHz
5
5
450MHz
900MHz
1900MHz
2350MHz
2600MHz
0.8
10
10
1.0
15
15
Rev. 0| Page 3 of 7
The turn-on time and pulse response is strongly influenced by
the size of the square-domain filter (C
capacitor connected to the VRMS output. Figure 6 (taken from
the ADL5502 data sheet) shows a plot of the output response to
an RF pulse on the RFIN pin, with a 0.1 μF output filter
capacitor and no square-domain filter capacitor (C
falling edge is particularly dependent on the output shunt
capacitance.
To improve the falling edge of the enable and pulse responses,
a resistor can be placed in parallel with the output shunt
capacitor. The added resistance helps to discharge the output
filter capacitor. Although this method reduces the power-off
time, the added load resistor also attenuates the output (see the
Output Drive Capability and Buffering section of the ADL5502
data sheet). Figure 7 (taken from the ADL5502 data sheet)
shows the improvement obtained by adding a parallel 1 kΩ
resistor.
Figure 5. Measured PEAK Output vs. Input Level (Linear Scale), 450 MHz,
Figure 6. Output Response to Various RF Input Pulse Levels, Supply3 V,
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
900 MHz Frequency, Square-Domain Filter Open, Output Filter 0.1 μF
0
0
900 MHz, 1900 MHz, 2350 MHz, 2600 MHz, Supply +3.3 V
0.2
0.4
INPUT (V rms)
1ms/DIV
0.6
160mV rms
400mV rms RF INPUT
250mV rms
70mV rms
FLTR
) and output shunt
450MHz
900MHz
1900MHz
2350MHz
2600MHz
0.8
PULSED RFIN
VRMS
CN-0187
FLTR
1.0
). The