5–2

5.3

Electrical Characteristics Over Recommended Operating Free-Air Temperature

Range, AVDD = 3.3 V, DVDD = 1.8 V, IOVDD = 3.3 V (Unless Otherwise Noted)

5.3.1

Digital Inputs and Outputs, fs = 8 kHz, Outputs Not Loaded

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOH

High-level output voltage, any digital output

0.8

IOVDD

V

VOL

Low-level output voltage, any digital output

0.1

IOVDD

V

IIH

High-level input current, any digital input

0.5

µA

IIL

Low-level input current, any digital input

0.5

µA

Ci

Input capacitance

3

pF

Co

Output capacitance

5

pF

5.4

ADC Path Digital Filter, fs = 8 kHz (see Note 2)

5.4.1

FIR Filter

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

0 to 300 Hz

–0.5

0.2

300 Hz to 3 kHz

–0.5

0.25

Filter gain relative to gain at 1020 Hz

3.3 kHz

–0.5

0.3

dB

Filter gain relative to gain at 1020 Hz

3.6 kHz

–3

dB

4 kHz

–35

≥4.4 kHz

–74

NOTE 2: Filter gain outside the passband is measured with respect to gain at 1020 Hz. The analog input test signal is a sinewave with

0 dB = 4 VI(PP) as the reference level for the analog input signal. The bandpass is 0 to 3600 Hz for an 8-kHz sample rate. This bandpass

scales linearly with the sample rate.

5.4.2

IIR Filter

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

0 to 300 Hz

–0.5

0.2

300 Hz to 3 kHz

–0.5

0.25

Filter gain relative to gain at 1020 Hz

3.3 kHz

–0.5

0.3

dB

Filter gain relative to gain at 1020 Hz

3.6 kHz

–3

dB

4 kHz

–20

≥4.4 kHz

–60

NOTE 2: Filter gain outside the passband is measured with respect to gain at 1020 Hz. The analog input test signal is a sinewave with

0 dB = 4 VI(PP) as the reference level for the analog input signal. The bandpass is 0 to 3600 Hz for an 8-kHz sample rate. This bandpass

scales linearly with the sample rate.