EM357-RTR datasheet(180/241 Pages) SILABS

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Rev 1.3

180

Table 10.7 describes the key ADC parameters measured on Silicon Labs’ EM357 reference design at 25 °C and

VDD_PADS at 3.0 V, for a sampling rate of 6 MHz. The single-ended measurements were done at finput = 7.7%

fNyquist, 0 dBFS level (where full-scale is a 1.2 V p-p swing). The differential measurements were done at

finput = 7.7% fNyquist; –6 dBFS level (where full-scale is a 2.4 V p-p swing) and a common mode voltage of 0.6 V.

Table 10.7. ADC Module Key Parameters for 6 MHz Sampling

Parameter

Performance

ADC_PERIOD

Conversion Time (µs)

5.33

10.7

21.3

42.7

85.3

171

341

683

Nyquist Freq (kHz)

93.8k

46.9k

23.4k

11.7k

5.86k

2.93k

1.47k

732

3 dB Cut-off (kHz)

56.6k

28.3k

14.1k

7.07k

3.54k

1.77k

884

442

INL (codes peak)1

0.084

0.15

0.274

0.518

1.057

2.106

4.174

INL (codes RMS)1

0.046

0.044

0.076

0.147

0.292

0.58

1.14

2.352

DNL (codes peak)1

0.026

0.023

0.044

0.052

0.096

0.119

0.196

0.371

DNL (codes RMS)1

0.007

0.009

0.013

0.015

0.024

0.03

0.05

0.082

ENOB



(from single-cycle test)

5.6

7.0

8.5

10.0

11.4

12.6

13.1

13.2

SNR (dB)2

Single-Ended

Differential

SINAD (dB)2

Single-Ended

Differential

SDFR (dB)

Single-Ended

Differential

THD (dB)

Single-Ended

Differential

–45

–54

–63

–68

–71

–70

–76

–70

–77

–70

–78

–70

–78

ENOB (from SNR)2

Single-Ended

Differential

5.6

7.1

8.6

10.0

10.1

11.4

11.5

12.1

12.5

12.4

12.9

12.5

13.0

ENOB (from SINAD)2

Single-Ended

Differential

5.5

5.6

7.0

7.1

8.5

8.6

9.9

10.1

11.0

11.4

12.4

11.5

12.8

11.5

13.0

Equivalent ADC Bits1

[15:9]

[15:8]

[15:7]

[15:6]

[15:5]

[15:4]

[15:3]

[15:2]

Notes:

INL and DNL are referenced to a LSB of the Equivalent ADC Bits shown in the last row of this table.

ENOB (effective number of bits) can be calculated from either SNR (signal to non-harmonic noise ratio) or SINAD

(signal-to-noise and distortion ratio).

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