6.7 Electrical Characteristics - AC Specifications (25 MSPS)

Maximum and minimum values are specified over the operating free-air temperature range and nominal supply voltages.

Typical values are specified at TA = 25°C, AVDD = IOVDD = 1.8 V, FSCLK = 25 MSPS, FIN = 5MHz, AIN = -1dBFS, Internal

1.2 V reference , and 50% clock duty cycle, unless otherwise noted

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

NSD

Noise Spectral Density

fIN = 10 MHz, AIN = -20 dBFS

-120.8

dBFS/Hz

SNR

Signal to noise ratio, excluding DC, HD2 to

HD5

fIN = 1.1 MHz

49.9

dBFS

fIN = 5 MHz

48

49.9

fIN = 10 MHz

49.9

fIN = 20 MHz

49.9

SINAD

Signal to noise and distortion ratio, excluding

DC offset

fIN = 1.1 MHz

49.6

dBFS

fIN = 5 MHz

49.7

fIN = 10 MHz

49.7

fIN = 20 MHz

49.7

ENOB

Effective number of bits, excluding DC offset

fIN = 1.1 MHz

8.0

Bit

fIN = 5 MHz

8.0

fIN = 10 MHz

8.0

fIN = 20 MHz

8.0

THD

Total Harmonic Distortion (First five

harmonics)

fIN = 1.1 MHz

-61

dBc

fIN = 5 MHz

-63

fIN = 10 MHz

-63

fIN = 20 MHz

-64

SFDR

Spur free dynamic range including second

and third harmonic

fIN = 1.1 MHz

63

dBFS

fIN = 5 MHz

60

65

fIN = 10 MHz

64

fIN = 20 MHz

64

SPUR

Spur free dynamic range (excluding DC,

HD2, HD3)

fIN = 1.1 MHz

67

dBFS

fIN = 5 MHz

63

68

fIN = 10 MHz

68

fIN = 20 MHz

68

IMD3

Two tone inter-modulation distortion

fIN = 8/10 MHz, AIN = -7 dBFS/tone

-91

dBc

XTALK

Channel-to-channel crosstalk

Aggressor = 1.1 MHz

107

dBFS

Aggressor = 10 MHz

97

Aggressor = 20 MHz

93

ADC3908D025, ADC3908D065, ADC3908D125

ADC3908S025, ADC3908S065, ADC3908S125

SBASAU9 – OCTOBER 2024

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