ADL5567ACPZN-R7 datasheet(19/24 Pages) AD

19 / 24 page

ADL5567

Data Sheet

Rev. 0 | Page 18 of 23

–10.0

–5.0

5.0

10.0

15.0

20.0

25.0

27.5

22.5

17.5

12.5

7.5

2.5

–2.5

–7.5

FREQUENCY (Hz)

10M

100M

10G

CLD = 0pF

CLD = 3pF, RSE = 0Ω

CLD = 1.5pF, RSE = 0Ω

CLD = 3pF, RSE = 15Ω

CLD = 1.5pF, RSE = 15Ω

Figure 47. Frequency Response for Various Load Capacitances,

VS = 5 V, High Performance Mode, RL = 200 Ω

ADC INTERFACING

A wideband data acquisition system (AD-FMCADC7-EBZ) using

the ADL5567 together with the AD9625 2.6 GSPS, 12-bit ADC

is shown in Figure 51. The RC filter after the amplifier works

with the pole formed by the ADC input capacitance to attenuate

the broadband noise and out-of-band harmonics generated by

the amplifier, as well as blocking the sharp switching pulses from

reaching the amplifier outputs and creating nonlinear effects.

Component values for different acquisition bandwidth are listed

in Table 6. An additional filter more specific to the system rejection

requirements is also needed ahead of the ADL5567 amplifier to

prevent unwanted signals from compressing the amplifier as

well as from reaching the ADC.

The signal-to-noise ratios with respect to full scale of the ADC

system (SNR FS), using various sources for sampling clock on

several circuit boards (such as the BRD-2, BRD-4, or BRD-5)

are shown in Figure 48. Two-tone intermodulation distortion

performance is shown in Figure 49, and the relative frequency

responses for this ADC system with different output filter

capacitors, are shown in Figure 50.

200

400

600

800

1000 1200 1400 1600 1800 2000

FREQUENCY (MHz)

AD9625 DATASHEET

BRD-4, AC-COUPLED, CRYSTEK, ADF, CLK

BRD-5, DC-COUPLED, ON-BOARD, OSC, CLKAMP, ADC

BRD-5, DC-COUPLED, CRYSTEK, 2.5GHz

BRD-2, AC-COUPLED, CRYSTEK, 2.6GHz, ADC

BRD-5, DC-COUPLED, CRYSTEK

BRD-3, DC-COUPLED, 2.5GHz, CRYSTEK

BRD-4, AC-COUPLED, SMA-CLK

BRD-8, DC-COUPLED, CRYSTEK, ADF, CLK

BRD-4, AC-COUPLED, CRYSTEK, 2.5GHz, CLK

BRD-5, DC-COUPLED, BALUN CRYSTEK, 2.5GHz

BRD-5, DC-COUPLED, SIG-GEN

BRD-5, DC-COUPLED, ADF

BRD-2, REVB, FINAL

Figure 48. ADC System SNR (Referred to Full Scale)

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

200

400

600

800

1000

1200

1400

1600

1800

FREQUENCY (MHz)

BRD-5, DC-COUPLED

BRD-4, AC-COUPLED

Figure 49. Measured Two-Tone IMD3 Performance

–30

–25

–20

–15

–10

–5

10M

100M

10G

FREQUENCY (Hz)

BRD-3, DUAL-AMP

BRD-3, DUAL-AMP, 2.2PF

BRD-5, DC-COUPLED, SIG-GEN

Figure 50. Measured Relative Frequency Response

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