TLC32046CFN Datasheet, PDF (35/56 Pages) Texas Instruments – Wide-Band Analog Interface Circuit

3.3.10 Receive Channel Band-Pass Filter Transfer Function, SCF f_clock = 288 kHz,
Input (IN+ – IN –) Is A ± 3-V Sine Wave^‡ (see Note 9)
PARMETER
TEST
CONDITION
Input signal
Filter gain _{reference is 0 dB}
FREQUENCY
f ≤ 100 Hz
f = 200 Hz
f = 300 Hz to 6200 Hz
f = 6200 Hz to 6600 Hz
f = 6600 Hz to 7300 Hz
f = 7600 Hz
f = 8000 Hz
f ≥ 8800 Hz
f ≥ 10000 Hz
ADJUSTMENT MIN TYP^†
K1 × 0 dB
– 33 – 29
K1 × – 0.26 dB
–4
–2
K1 × 0 dB
– 0.25
0
K1 × 0 dB
– 0.3
0
K1 × 0 dB
0
K1 × 2.3 dB
–2
K1 × 2.7 dB
– 16
K1 × 3.2 dB
K1 × 0 dB
MAX
– 25
–1
0.25
0.3
0.5
– 0.5
– 14
– 40
– 65
UNIT
dB
3.3.11 Receive and Transmit Channel Low-Pass Filter Transfer Function,
SCF f_clock = 288 kHz (see Note 9)
TEST
CONDITION
FREQUENCY
RANGE
ADJUSTMENT
ADDEND^‡
MIN TYP^† MAX UNIT
f = 0 Hz to 6200 Hz
K1 × 0 dB
– 0.25
0 0.25
f = 6200 Hz to 6600 Hz
K1 × 0 dB
– 0.3
0 0.3
Filter gain
Input signal
reference is 0 dB
f = 6600 Hz to 7300 Hz
f = 7600 Hz
f = 8000 Hz
K1 × 0 dB
K1 × 2.3 dB
K1 × 2.7 dB
– 0.5
0 0.5
– 2 – 0.5 dB
– 16 – 14
f ≥ 8800 Hz
K1 × 3.2 dB
– 40
f ≥ 10000 Hz
K1 × 0 dB
– 65
† _{All typical values are at TA = 25°C.}
‡ _{The MIN, TYP, and MAX specifications are given for a 288-kHz SCF clock frequency. A slight error in the 288-kHz SCF}
may 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 – 288 kHz)/288 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 (2 kHz for M version).
The filter gain within the pass band is measured with respect to the average gain within the pass band. The
pass bands are 300 Hz to 7200 Hz and 0 to 7200 Hz for the band-pass and low-pass filters, respectively. For
switched-capacitor filter clocks at frequencies other than 288 kHz, the filter response is shifted by the ratio of
switched-capacitor filter clock frequency to 288 kHz.
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