TLC320AD56C Datasheet, PDF (28/43 Pages) Texas Instruments – Sigma-Delta Analog Interface Circuit

4.3 Electrical Characteristics Over Recommended Operating Free-Air
Temperature Range, DV_DD = 5 V, AV_DD = 5 V (Unless Otherwise Noted)
4.3.1 Digital Inputs and Outputs, MCLK = 4.096 MHz, f_s = 8 kHz, Outputs Not Loaded
PARAMETER
TEST CONDITIONS MIN TYP MAX UNIT
VOH High-level output voltage, DOUT
IO = 360 µA
2.4 4.6
V
VOL Low-level output voltage, DOUT
IIH High-level input current, any digital input
IO = 2 mA
VIH = 5 V
0.2 0.4 V
10 µA
IIL Low-level input current, any digital input
VIL = 0.8 V
10 µA
Ci
Input capacitance
5
pF
Co Output capacitance
5
pF
4.3.2
VOH
VOL
IIH
IIL
Ci
Co
Digital Inputs and Outputs, MCLK = 4.096 MHz, f_s = 8 kHz, Outputs Not Loaded,
DV_DD = 3 V
PARAMETER
TEST CONDITIONS MIN TYP MAX UNIT
High-level output voltage, DOUT
Low-level output voltage, DOUT
High-level input current, any digital input
Low-level input current, any digital input
Input capacitance
IO = 360 µA
IO = 2 mA
VIH = 3.3 V
VIL = 0.6 V
2
V
0.4 V
10 µA
10 µA
5
pF
Output capacitance
5
pF
4.3.3 ADC Path Filter, MCLK = 4.096 MHz, f_s = 8 kHz (see Note 4)
PARAMETER
TEST CONDITIONS MIN TYP MAX UNIT
0 to 300 Hz
– 0.5
0.2
300 Hz to 3 kHz – 0.35
0.2
Filter gain relative to gain at 1020 Hz
3.3 kHz
3.6 kHz
– 0.4
0.3
dB
–3
4 kHz
– 40
≥ 4.4 kHz
– 74
NOTE 4: 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 = 6 VI(PP) as the reference level for the analog input signal. The –1 dB pass
band is 0 to 3400 Hz for an 8-kHz sample rate. This pass band scales linearly with the sample rate.
4.3.4 ADC Dynamic Performance, MCLK = 4.096 MHz, f_s = 8 kHz
4.3.4.1 ADC Signal-to-Noise (see Note 5)
PARAMETER
TEST CONDITIONS MIN TYP MAX UNIT
VI = – 1 dB
86
VI = – 3 dB
80
84
VI = – 6 dB
76
81
Signal-to-noise ratio (SNR)
VI = – 9 dB
73
78
dB
VI = – 40 dB
42
47
VI = – 65 dB
17
22
VAUX = – 9 dB
73
78
NOTE 5: The test condition is a 1020-Hz input signal with an 8-kHz conversion rate. Input and output voltages are
referred to AVDD /2.
4–2