AD7450ARM datasheet(7/24 Pages) AD

7 / 24 page

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PRELIMINARY TECHNICAL DATA

–7–

AD7450

PERFORMANCE CURVES

TPC 1 and TPC 2 show the typical FFT plots for the

AD7450 with VDD of 5V and 3V, 1MHz and 833kHz sam-

pling frequency respectively and an input frequency of

300kHz.

-120

-100

-80

-60

-40

-20

100

150

200

250

300

350

400

450

500

FREQUENCY (kHz)

8192 POINT FFT

FSAMPLE = 1MSPS

FIN = 300kHz

SINAD = 71.7dB

THD = -82.8dB

SFDR = -85.3dB

TPC 1. AD7450 Dynamic Performance at 1MSPS

with VDD =5V

-120

-100

-80

-60

-40

-20

100

150

200

250

300

350

FREQUENCY (kHz)

8192 POINT FFT

fSAMPLE = 833ksps

fIN = 300kHz

SINAD = 70.2dB

THD = -86dB

SFDR = -87.1dB

TPC 2. AD7450 Dynamic Performance at 833ksps with

VDD = 3V

TPC 3 shows the signal-to-(noise+distortion) ratio

performance versus the analog input frequency for

various supply voltages while sampling at 1MSPS

(VDD = 5V±5%) and 833kSPS (VDD = 3V±10%).

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TPC 3. SINAD vs Analog Input Frequency

for Various Supply Voltages TBD

TPC 4 shows the power supply rejection ratio versus

supply ripple frequency for the AD7450.

Here, a

200mV p-p sine wave is coupled onto the VDD supply.

A 10nF decoupling capacitor was used on the supply

and a 1µF decoupling capacitor was used on VREF.

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TPC 4. Power Supply Rejection (see Terminology Sec-

tion) vs. Supply Ripple Frequency at 5V and 3V TBD

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