TLC32047C Datasheet, PDF (39/61 Pages) Texas Instruments – Wide-Band Analog Interface Circuit

3.3.8 Transmit Channel Signal-to-Distortion Ratio (see Note 7)
PARAMETER
TEST CONDITIONS
MIN MAX UNIT
VI = – 6 dB to – 0.1 dB
58
VI = – 12 dB to – 6 dB
58
VI = – 18 dB to – 12 dB
56
VI = – 24 dB to – 18 dB
50
D/A channel signal-to-distortion ratio
VI = – 30 dB to – 24 dB
44
dB
VI = – 36 dB to – 30 dB
38
VI = – 42 dB to – 36 dB
32
VI = – 48 dB to – 42 dB
26
VI = – 54 dB to – 48 dB
20
NOTE 7: The test condition is a 1-kHz input signal with a 24-kHz conversion rate. The load impedance for the DAC is
600 Ω. Input and output voltages are referred to Vref.
3.3.9 Receive and Transmit Gain and Dynamic Range (see Note 8)
PARAMETER
TEST CONDITIONS
MIN TYP† MAX UNIT
Transmit gain tracking error
VO = – 48 dB to 0 dB signal range
± 0.05 ± 0.25 dB
Receive gain tracking error
VI = – 48 dB to 0 dB signal range
± 0.05 ± 0.25 dB
NOTE 8: Gain tracking is relative to the absolute gain at 1 kHz and 0 dB (0 dB relative to Vref).
3.3.10
Receive Channel Band-Pass Filter Transfer
Input (IN+ – IN –) is a ± 3-V Sine Wave^‡ (see
Function,
Note 9)
SCF
f_clock
=
432
kHz,
PARAMETER
TEST
CONDITION
FREQUENCY
ADJUSTMENT MIN TYP† MAX UNIT
f ≤ 150 Hz
K1 × 0 dB
– 33 – 29 – 25
f = 300 Hz
K1 × – 0.26 dB
–4 –2 –1
f = 450 Hz to 9300 Hz K1 × 0 dB
– 0.25
0 0.25
Filter gain
Input signal
reference is 0 dB
f = 9300 Hz to 9900 Hz
f = 9900 Hz to 10950 Hz
f = 11.4 kHz
K1 × 0 dB
K1 × 0 dB
K1 × 2.3 dB
– 0.3
– 0.5
0 0.3
0 0.5 dB
–2 – 0.5
f = 12 kHz
K1 × 2.7 dB
– 16 – 14
f ≥ 13.2 kHz
K1 × 3.2 dB
– 40
f ≥ 15 kHz
K1 × 0 dB
– 60
† _{All typical values are at TA = 25°C.}
‡ _{The MIN, TYP, and MAX specifications are given for a 432-kHz SCF clock frequency. A slight error in the 432-kHz SCF}
can result from inaccuracies in the MSTR CLK frequency, resulting from crystal frequency tolerances. If this frequency
error is less than 0.25%, the ADJUSTMENT ADDEND should be added to the MIN, TYP, and MAX specifications, where
K1 = 100 × [(SCF frequency – 432 kHz)/432 kHz]. For errors greater than 0.25%, see Note 9.
NOTE 9: The filter gain outside of the pass band is measured with respect to the gain at 1 kHz. The filter gain within the
pass band is measured with respect to the average gain within the pass band. The pass bands are 450 Hz
to 10.95 kHz and 0 to 10.95 kHz for the band-pass and low-pass filters, respectively. For switched-capacitor
filter clocks at frequencies other than 432 kHz, the filter response is shifted by the ratio of switched-capacitor
filter clock frequency to 432 kHz.
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