ADL5534ACPZ-R7 Analog Devices Inc, ADL5534ACPZ-R7 Datasheet - Page 11

• Manufacturer Part Number: ADL5534ACPZ-R7
• Description: Dual 5531
• Manufacturer: Analog Devices Inc

Specifications of ADL5534ACPZ-R7

• Design Resources: Interfacing ADL5534 to AD9640 High Speed ADC (CN0049)
• Current - Supply: 98mA ~ 110mA
• Frequency: 20MHz ~ 500MHz
• Gain: 19dB ~ 20.5dB
• Noise Figure: 3dB
• P1db: 20.4dBm
• Package / Case: 16-VQFN, 16-CSP, Exposed Pad
• Rf Type: General Purpose
• Test Frequency: 380MHz
• Voltage - Supply: 4.75 V ~ 5.25 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADL5534ACPZ-R7TR

ADC DRIVING APPLICATION
The ADL5534 is a high linearity, fixed gain IF amplifier suitable
for use as an ADC driver. The ADL5534 has a differential input
and output impedance of 100 Ω. A flux-coupled RF transformer
with a 2:1 impedance ratio was used to perform the single-ended-
to-differential conversion at the input of the ADL5534. The
interface between the ADL5534 and the
order low pass filter presenting a 100 Ω differential impedance
to the source and load. The ADL5534 must be ac-coupled to
prevent dc bias from entering the inputs of the ADC. Capacitors
of 100 pF were chosen to reduce any low frequency noise coming
from the ADL5534 and provide dc blocking. The measured
results for this interface shows 0.5 dB insertion loss for a 20 MHz
bandwidth centered around 92 MHz. The wideband response for
the interface is shown in Figure 19. The single-tone results in
Figure 20 show an SNR of 69.3 dB and an SFDR of 82 dBc. The
two-tone results in Figure 21 show an IMD3 of −80.5 dBc and
an SFDR of 78 dBc.
–10
–15
–20
–25
–30
–35
–40
–45
–5
Figure 19. Measured Frequency Response of ADC interface
5
0
50
RFIN
100
150
FREQUENCY (MHz)
in Figure 18
200
10nF
250
1
2
3
4
AD9640
Figure 18. Narrow-Band IF Sampling Solution for Unbuffered ADC
NC
NC
NC
NC
300
ADL5534
1nF
350
is a third-
Z1
400
470nH
470nH
NC
NC
NC
Rev. 0 | Page 11 of 16
12
11
10
9
10nF
1nF
10nF
1µF
1µF
Figure 20. Measured Single-Tone Performance of the Circuit in Figure 18
100pF
100pF
Figure 21. Measured Two-Tone Performance of the Circuit in Figure 18
VPOS1
GND1
–105
–120
–135
–105
–120
–135
120nH
120nH
–15
–30
–45
–60
–75
–90
–15
–30
–45
–60
–75
–90
VPOS
GND
16pF
0
0
0
0
SNR = 69.334dBc
SFDR = 82.267dBc
NOISE FLOOR = –109.519dB
FUND = –1.05dBFs
SECOND = –82.262dBc
THIRD = –88.688dBc
SFDR = 78.267dBc
NOISE FLOOR = –110.131dB
FUND 1 = –7.181dBFs
FUND 2 = –7.191dBFs
IMD (2F1 – F2) = –80.538dBc
IMD (2F2 – F1) = –82.086dBc
6
6
120nH
120nH
CML
49.9Ω
49.9Ω
12
12
18
18
4.7pF
33Ω
33Ω
FREQUENCY (MHz)
FREQUENCY (MHz)
24
24
30
30
36
36
AD9640
42
42
48
48
ADL5534
54
54
60
60