AD7725 datasheet(14/28 Pages) AD

14 / 28 page

REV. A

–14–

AD7725–Typical Performance Characteristics

PERFORMANCE PLOTS

The following typical plots are generated using the digital filter shown in Figure 1.

(AV

DD = DVDD, TA = 25 C, CLKIN = 9.6 MHz, External Reference = 2.5 V, unless otherwise noted.)

ANALOG INPUT LEVEL – dB

110

100

–50

–40

–30

–20

–10

SFDR

THD

SNR

INPUT FREQUENCY = 10kHz

TPC 1. SNR, THD, and SFDR vs. Analog Input

Level Relative to Full Scale

CLKIN FREQUENCY – MHz

120

14.4

2.4

7.2

9.6

110

100

4.8

THD

SFDR

SNR

INPUT FREQUENCY = 10kHz

TPC 2. SNR, THD, and SFDR vs. Sampling Frequency

TEMPERATURE – C

110

105

–50

100

–25

100

SFDR

THD

SNR

INPUT FREQUENCY = 10kHz

TPC 3. SNR, THD, and SFDR vs. Temperature

CODE

5000

32717

32726

32718

32721 32722

4000

2000

1000

32724

8192 SAMPLES TAKEN

VIN(+) = V IN(–)

MAXIMUM OUTPUT DATA RATE

3000

32719 32720

32723

32725

TPC 4. Histogram of Output Codes for a DC Input

FREQUENCY – kHz

–20

–160

300

100

150

–40

–100

–120

–60

–80

–140

250

SNR = 84dB

THD = –93.85dB

SFDR = –98.47dB

AIN = 10kHz

MEASURED BW = 300kHz

200

TPC 5. 16k Point FFT

FREQUENCY – kHz

–20

–160

300

100

150

–40

–100

–120

–60

–80

–140

250

SNR = 80.48dB

THD = –90.62dB

SFDR = –98dB

AIN = 10kHz

MEASURED BW = 450kHz

200

350

400

450

TPC 6. 16k Point FFT for a 108 Tap Low-Pass FIR

Filter Operating with a CLKIN Frequency of 14.4 MHz

AD7725 Datasheet(PDF) 14 Page - Analog Devices

AD7725 Datasheet(HTML) 14 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Datasheet Download

Link URL