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TLC320AD545 Datasheet, PDF (22/37 Pages) Texas Instruments – Single Channel Data/Fax Codec
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5.3 Electrical Characteristics Over Recommended Operating Free-Air
Temperature Range DVDD = 5 V/3.3 V, AVDD = 5 V/3.3 V, MVDD = 5 V/3.3 V
5.3.1 Digital Inputs and Outputs, fs = 8 kHz, Outputs Not Loaded
PARAMETER
VOH High-level output voltage, any digital output
VOL Low-level output voltage, any digital output
IIH
IIL
Cj
CO
II(lkg)
IOZ
High-level input current, any digital input
Low-level input current, any digital input
Input capacitance, any digital input
Output capacitance, any digital output
Input leakage current, any digital input
Output leakage current, any digital output
TEST CONDITIONS MIN
IO = –360 µA
IO = 2 mA
VIH = 5 V
VIL = 0.6 V
2.4
DVSS
– 0.5
TYP MAX UNIT
DVDD
+ 0.5
V
0.4 V
10 µA
10 µA
10
pF
10
pF
10 µA
10 µA
5.3.2 ADC Channel, fs = 8 kHz (see Note 3)
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
3.6 kHz
–0.35
0.3
dB
–3
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 ADC Dynamic Performance, fs = 8 kHz
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.
5–2
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