5–2
5.3
Electrical Characteristics Over Recommended Operating Free-Air
Temperature Range DV
DD
= 5 V/3.3 V, AV
DD
= 5 V/3.3 V, MV
DD
= 5 V/3.3 V
Digital Inputs and Outputs, f
s
= 8 kHz, Outputs Not Loaded
5.3.1
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VOH
High-level output voltage, any digital output
IO = –360
μ
A
2.4
DVDD
+ 0.5
V
VOL
Low-level output voltage, any digital output
IO = 2 mA
DVSS
– 0.5
0.4
V
IIH
IIL
Cj
CO
II(lkg)
IOZ
High-level input current, any digital input
VIH = 5 V
VIL = 0.6 V
10
μ
A
μ
A
pF
Low-level input current, any digital input
10
Input capacitance, any digital input
10
Output capacitance, any digital output
10
pF
μ
A
μ
A
Input leakage current, any digital input
10
Output leakage current, any digital output
10
5.3.2
ADC Channel, f
s
= 8 kHz (see Note 3)
PARAMETER
TEST CONDITIONS
0 to 300 Hz
MIN
–0.5
TYP
MAX
0.2
UNIT
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
3.6 kHz
–3
4 kHz
≥
4.4 kHz
–35
–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
ADC Dynamic Performance, f
s
= 8 kHz
5.3.3.1 ADC Signal-to-Noise (see Note 4)
PARAMETER
TEST CONDITIONS
VI = –1 dB
VI = –9 dB
VI = –40 dB
MIN
76
TYP
81
MAX
UNIT
Signal-to-noise ratio (SNR)
68
37
73
42
dB
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
VI = –3 dB
VI = –9 dB
VI = –40 dB
MIN
74
TYP
79
MAX
UNIT
Signal-to-total harmonic distortion (THD)
82
58
87
63
dB
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.