REV. B

Typical Performance Characteristics–AD7910/AD7920

–9–

TPC 1 and TPC 2 show a typical FFT plot for the AD7920 and

AD7910, respectively, at a 250 kSPS sampling rate and a 100 kHz

input frequency.

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

versus input frequency for various supply voltages while sampling

at 250 kSPS with a SCLK frequency of 5 MHz for the AD7920.

TPC 4 and TPC 5 show typical INL and DNL performance for the

AD7920.

FREQUENCY (kHz)

–5

–55

–115

0

125

25

50

75

100

–15

–35

–75

–95

8192 POINT FFT

SINAD = 72.05dB

THD = –82.87dB

SFDR = –87.24dB

TPC 1. AD7920 Dynamic Performance at 250 kSPS

FREQUENCY (kHz)

–45

–105

–5

–25

–65

–85

8192 POINT FFT

SINAD = 61.67dB

THD = –79.59dB

SFDR = –82.93dB

0

125

25

50

75

100

TPC 2. AD7910 Dynamic Performance at 250 kSPS

FREQUENCY (kHz)

–72.0

10

1000

100

–73.0

–73.5

–72.5

–71.0

–71.5

TPC 3. AD7920 SINAD vs. Input Frequency at 250 kSPS

CODE

1.0

0.4

–0.2

0

1024

512

0.8

0.6

0.2

0

–0.4

–0.6

–0.8

–1.0

1536

2048

2560

3072

3584

4096

TEMP = 25 C

TPC 4. AD7920 INL Performance

TPC 6 shows a graph of the total harmonic distortion versus analog

input frequency for different source impedances when using a

supply voltage of 3.6 V and sampling at a rate of 250 kSPS. See the

Analog Input section.

TPC 7 shows a graph of the total harmonic distortion versus analog

input signal frequency for various supply voltages while sampling

at 250 kSPS with an SCLK frequency of 5 MHz.