AD7944 datasheet(9/28 Pages) AD

Part #	AD7944

Description	14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP

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AD7944

Rev. 0 | Page 9 of 28

TYPICAL PERFORMANCE CHARACTERISTICS

AVDD = DVDD = VIO = 2.5 V, BVDD = 5.0 V, VREF = 5.0 V, external reference (PDREF is high, REFIN is low), unless otherwise noted.

0

4096

8192

12,288

16,384

–1.0

–0.8

–0.6

–0.4

–0.2

0

0.2

0.4

0.6

0.8

1.0

CODE

POSITIVE INL = +0.12 LSB

NEGATIVE INL = –0.20 LSB

Figure 5. Integral Nonlinearity vs. Code

00

2

4899

149

00

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

0

8188

8189

8190

8191

8192

8193

8194

8195

8196

CODE IN HEX

126,022

Figure 6. Histogram of DC Input at Code Center (External Reference)

00

2

5236

1438

00

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

0

8188

8189

8190

8191

8192

8193

8194

8195

8196

CODE IN HEX

124,396

Figure 7. Histogram of DC Input at Code Center (Internal Reference)

0

4096

8192

12,288

16,384

–1.0

–0.8

–0.6

–0.4

–0.2

0

0.2

0.4

0.6

0.8

CODE

POSITIVE DNL = +0.11LSB

NEGATIVE DNL = –0.11LSB

Figure 8. Differential Nonlinearity vs. Code

00

324

62,982

000

0

10,000

20,000

30,000

40,000

50,000

60,000

80,000

70,000

8188

8189

8190

8191

8192

8193

8194

8195

CODE IN HEX

67,766

Figure 9. Histogram of DC Input at Code Transition (External Reference)

00

7

63,238

2

00

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

8189

8190

8191

8192

8193

8194

8195

8196

67,825

CODE IN HEX

Figure 10. Histogram of DC Input at Code Transition (Internal Reference)

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