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AD9625BBPZRL-2.5 Datasheet(PDF) 33 Page - Analog Devices

Part # AD9625BBPZRL-2.5
Description  1.3 V/2.5 V Analog-to-Digital Converter
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9625BBPZRL-2.5 Datasheet(HTML) 33 Page - Analog Devices

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Data Sheet
AD9625
Rev. C | Page 31 of 72
Figure 80 uses a 1:2 impedance transformer to provide the
100 Ω input impedance of the ADA4961 with a matched input.
The open collector outputs of the ADA4961 are biased through
the two 560 nH inductors. The two 0.1 μF capacitors on the
outputs decouple the 5 V inductor voltage from the input
common-mode voltage of the ADA4961. The two 50 Ω
resistors in parallel with the 100 Ω input impedance of the
AD9625 provide the 50 Ω load to the ADA4961, whose gain
is load dependent. The 2 nH inductors and the 1.5 pF internal
capacitance of the AD9625 constitute a 1 GHz low-pass filter to
−1 dB. The two 10 Ω isolation resistors suppress any switching
currents from the AD9625 sample-and-hold circuitry. The
circuit depicted in Figure 80 provides variable gain, isolation,
filtering and source matching for the AD9625. By using this
circuit with the ADA4961 in a gain of 15 dB (maximum gain)
an SNRFS of 55 dB and an SFDR performance of 77 dBc are
achieved with a 1 GHz input as shown in Figure 80.
0
–120
–100
–80
–60
–40
–20
FREQUENCY (MHz)
2500MSPS
1003.8MHz AT –1.0dBFS
SNR = 53.83dB
SFDR = 77.354dBc
0
150
5
23
6
+
300
450
600
750
900
1050
1200
4
Figure 77. Measured Single-Tone Performance of the Circuit Shown in
Figure 80 for a 1 GHz Input Signal Using Maximum Gain (15 dB)
The two-tone 1 GHz IMD of two 0.55 V p-p signals have an
SFDR of greater than 75 dBc, as shown in Figure 78.
0
–120
–100
–80
–60
–40
–20
FREQUENCY (MHz)
2500MSPS
fIN1 = 1022.3MHz AT –7.0dBFS
fIN2 = 1012.3MHz AT –7.0dBFS
SFDR = 75.8dBc
0
150
F2 – F1
F1 + F2
2F2 + F1
2F1 + F2
2F1 – F2
2F2 – F1
300
450
600
750
900
1050
1200
Figure 78. Measured Two-Tone Performance of the Circuit Shown in
Figure 80 for a 1 GHz input Signal Using Maximum Gain (15 dB)
10
–25
–20
–15
–10
–5
0
5
10
100
1000
10000
FREQUENCY (MHz)
Figure 79. Measured Frequency Response of the AD9625 Interface with
ADA4961 Depicted in Figure 80
AD9625
VCM
10Ω
10Ω
50Ω
50Ω
1.5pF
100Ω
MARKI
BAL-0006GSMG
1:2
+
VIN+
VIN–
2nH
2nH
0.1µF
0.1µF
0.1µF
0.1µF
5.0V
0.5nH
5.0V
5.0V
0.5nH
DIGITAL
INTERFACE
ADA4961
50Ω
BANDPASS
FILTER
AC
Figure 80. Configuration for Driving the AD9625 with ADA4961


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