TCM320AC56 Datasheet, PDF (7/23 Pages) Texas Instruments – VOICE-BAND AUDIO PROCESSORS (VBAP)

TCM320AC56, TCM320AC57
VOICE-BAND AUDIO PROCESSORS (VBAP)
SLWS016A – JUNE 1996 – REVISED APRIL 1997
transmit gain and dynamic range, companded mode (µ-law or A-law) or linear mode selected, V_CC = 5 V,
T_A = 25°C (unless otherwise noted) (see Notes 5 and 6)
PARAMETER
TEST CONDITIONS
MIN MAX UNIT
Companded mode selected, µ-law (’AC56)
0.982
Transmit reference-signal level (0 dB) (see Note 7)
Companded mode selected, A-law (’AC57)
0.985 Vrms
Linear mode selected (’AC56 and ’AC57)
1.001
Companded mode selected, µ-law (’AC56)
4
Overload-signal level (MICIN at unity gain)
Companded mode selected, A-law (’AC57)
4 Vpp
Linear mode selected (’AC56 and ’AC57)
4
Absolute gain error
0-dB input signal
± 1 dB
MICIN to DOUT at 3 dBm0 to – 36 dBm0
± 0.5
Gain error with input level relative to gain at –10 dBm0
MICIN to DOUT at – 37 dBm0 to – 40 dBm0
MICIN to DOUT at – 41 dBm0 to – 50 dBm0
±1
dB
± 1.5
MICIN to DOUT at – 51 dBm0 to – 55 dBm0
±2
Gain variation
VCC ± 10%, TA = 0°C to 70°C
± 0.5 dB
NOTES:
5. Unless otherwise noted, the analog input is 0 dB, 1020-Hz sine wave, where 0 dB is defined as the zero-reference point of the channel
under test.
6. The input amplifier is set for inverting unity gain.
7. The reference-signal level, which is input to the transmit channel, is defined as a value 3 dB below the full-scale value of 2 V.
transmit filter transfer, companded mode (µ-law or A-law) or linear mode selected, over recommended
ranges of supply voltage and free-air temperature, CLK = 2.048 MHz, FSX = 8 kHz (see Note 6)
PARAMETER
TEST CONDITIONS
Input amplifier set for unity gain,
Gain relative to input signal gain at 1.02 kHz noninverting maximum gain output
signal at MICIN is 0 dB
NOTE 6. The input amplifier is set for inverting unity gain.
fMICIN = 50 Hz
fMICIN = 200 Hz
fMICIN = 300 Hz to 3 kHz
fMICIN = 3.3 kHz
fMICIN = 3.4 kHz
fMICIN = 4 kHz
fMICIN ≥ 4.6 kHz
MIN
–10
–1.8
– 0.35
–1
MAX
0
0
±0.15
0.04
– 0.1
–14
– 32
UNIT
dB
transmit idle channel noise and distortion, companded mode with µ-law or A-law selected, over
recommended ranges of supply voltage and operating free-air temperature (see Note 8)
PARAMETER
TEST CONDITIONS
Transmit noise, psophometrically weighted
MICIN connected to MICGS through a 10-kΩ resistor
Transmit noise, C-message weighted
MICIN connected to MICGS through a 10-kΩ resistor
MICIN to DOUT at 0 dBm0 to – 17 dBm0
MICIN to DOUT at –18 dBm0 to – 23 dBm0
Transmit signal-to-distortion ratio with sine-wave input MICIN to DOUT at – 24 dBm0 to – 29 dBm0
MICIN to DOUT at – 30 dBm0 to – 35 dBm0
MICIN to DOUT at – 36 dBm0 to – 45 dBm0
Intermodulation distortion, 2-tone CCITT method,
composite power level –13 dBm0
CCITT G.712 (7.1), R2
CCITT G.712 (7.2), R3
NOTE 8: Transmit noise, linear mode: 200 µVrms is equivalent to –74 dB (referenced to device 0-dB level).
MIN MAX UNIT
– 71 dBm0p
10 dBrnC0
36
34
30
dB
24
16
49
dB
51
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