5–2

5.3

Electrical Characteristics Over Recommended Operating Free-Air

5.3.1

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOH

High-level output voltage, any digital output

IO = –360 µA

2.4

DVDD

+ 0.5

V

VOL

Low-level output voltage, any digital output

IO = 2 mA

DVSS

– 0.5

0.4

V

IIH

High-level input current, any digital input

VIH = 5 V

10

µA

IIL

Low-level input current, any digital input

VIL = 0.6 V

10

µA

Cj

Input capacitance, any digital input

10

pF

CO

Output capacitance, any digital output

10

pF

II(lkg)

Input leakage current, any digital input

10

µA

IOZ

Output leakage current, any digital output

10

µA

5.3.2

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

0 to 300 Hz

–0.5

0.2

300 Hz to 3 kHz

–0.25

0.25

Filter gain relative to gain at 1020 Hz

3.3 kHz

–0.35

0.3

dB

Filter gain relative to gain at 1020 Hz

3.6 kHz

–3

dB

4 kHz

–35

≥4.4 kHz

–74

NOTE 3: The filter gain outside of the passband is measured with respect to the gain at 1020 Hz. The analog input test signal is a sine wave with

0 dB=3 VPP at 5-V supply and 0 db = 2 VPP at 3.3-V supply differential as the reference level for ADC analog input signal. The –3 dB

passband is 0 to 3600 Hz for an 8-kHz sample rate. This passband scales linearly with the sample rate.

5.3.3

5.3.3.1 ADC Signal-to-Noise (see Note 4)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VI = –1 dB

76

81

Signal-to-noise ratio (SNR)

VI = –9 dB

68

73

dB

VI = –40 dB

37

42

NOTE 4: The test condition is a 1020-Hz input signal with an 8-kHz conversion rate. Input and output common mode is 2.5 V for 5 V supply and

1.5 V for 3.3 V supply. The output configuration is in a 5 V differential-ended mode.

5.3.3.2 ADC Signal-to-Distortion (see Note 4)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VI = –3 dB

74

79

Signal-to-total harmonic distortion (THD)

VI = –9 dB

82

87

dB

VI = –40 dB

58

63

NOTE 4: The test condition is a 1020-Hz input signal with an 8-kHz conversion rate. Input and output common mode is 2.5 V for 5 V supply and

1.5 V for 3.3 V supply. The output configuration is in a 5 V differential-ended mode.