TLC320AC02C_15 Datasheet, PDF (42/86 Pages) Texas Instruments – Single-Supply Analog Interface Circuit

3.5.5 DAC Channel Signal-to-Distortion Ratio, V_DD = 5 V, f_s = 8 kHz (Unless
Otherwise Noted)
PARAMETER
TEST CONDITIONS
AV = 0 dB
AV = – 6 dB AV = – 12 dB _UNIT
MIN MAX MIN MAX MIN MAX
VO = – 6 dB to 0 dB
64
—
—
VO = – 12 dB to – 6 dB
59
64
—
VO = – 18 dB to – 12 dB
56
59
64
DAC channel signal-to-
distortion ratio
VO = – 24 dB to – 18 dB
50
56
59
dB
(see Note 8)
VO = – 30 dB to – 24 dB
44
50
56
VO = – 36 dB to – 30 dB
38
44
50
VO = – 42 dB to – 36 dB
32
38
44
VO = – 48 dB to – 42 dB
26
32
38
NOTE 8: The input signal, VI, is the digital equivalent of a 1020-Hz sine wave (full-scale analog output at full-scale digital
input = 0 dB). The nominal differential DAC channel output with this input condition is 6 V peak to peak. The
load impedance for the DAC output buffer is 600 Ω from OUT + to OUT –.
3.5.6
System Distortion, V_DD = 5 V, f_s = 8 kHz, FCLK = 144 kHz (Unless Otherwise
Noted)
PARAMETER
TEST CONDITIONS
MIN TYP† MAX UNIT
ADC channel
attenuation
Second harmonic
Third harmonic and
higher harmonics
Single-ended input (see Note 9)
Differential input (see Note 9)
Single-ended input (see Note 9)
Differential input (see Note 9)
82
64
82
77
64
77
Second harmonic
Single-ended output
(buffered DAC VMID)
(see Note 10)
82
dB
DAC channel
attenuation
Third harmonic and
higher harmonics
Differential output (see Note 10)
Single-ended output
(see Note 10)
Differential output (see Note 10)
64
82
77
64
77
† _{All typical values are at VDD = 5 V and TA = 25°C.}
NOTES: 9. The input signal is a 1020-Hz sine wave for the ADC channel. Harmonic distortion is defined for an input
level of – 1 dB.
10. The input signal is the digital equivalent of a 1020-Hz sine wave (digital full scale = 0 dB). The nominal
differential DAC channel output with this input condition is 6 V peak to peak. The load impedance for the
DAC output buffer is 600 Ω from OUT + to OUT –. Harmonic distortion is specified for a signal input level
of 0 dB.
3–4