TLC32047C Datasheet, PDF (40/61 Pages) Texas Instruments – Wide-Band Analog Interface Circuit

3.3.11 Receive and Transmit Channel Low-Pass Filter Transfer Function,
SCF f_clock = 432 kHz (see Note 9)
PARAMETER
TEST
CONDITION
FREQUENCY
RANGE
ADJUSTMENT
ADDEND‡
MIN TYP† MAX UNIT
f = 0 Hz to 9300 Hz
K1 × 0 dB
– 0.25
0 0.25
f = 9300 Hz to 9900 Hz K1 × 0 dB
– 0.3
0 0.3
Filter gain
Input signal
reference is 0 dB
f = 9900 Hz to 10950 Hz
f = 11.4 kHz
f = 12 kHz
K1 × 0 dB
K1 × 2.3 dB
K1 × 2.7 dB
– 0.5
0 0.5
– 5 – 2 – 0.5 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}
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 – 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.
3.4 Operating Characteristics Over Recommended Operating Free-Air
Temperature Range, V_CC+ = 5 V, V_CC– = –5 V, V_DD = 5 V
3.4.1
Receive and Transmit Noise (Measurement Includes Low-Pass and Band-Pass
Switched-Capacitor Filters)
PARAMETER
TEST CONDITIONS
MIN TYP† MAX UNIT
broadband with (sin x)/x
280 500
Transmit
noise
broadband without (sin x)/x _{DX = input = 00000000000000,}
0 to 12 kHz with (sin x)/x
constant input code
250 450
µV rms
250 400
0 to 12 kHz without (sin x)/x
240 400
300
Receive noise (see Note 10)
Inputs grounded, gain = 1
18
† _{All typical values are at TA = 25°C.}
NOTE 10: The noise is computed by statistically evaluating the digital output of the A/D converter.
500 µV rms
dBrnc0
3–6