TWL1109 Datasheet, PDF (7/27 Pages) Texas Instruments – VOICE-BAND AUDIO PROCESSOR VBAPE

TWL1109
VOICE-BAND AUDIO PROCESSOR (VBAP™)
SLWS095 – MARCH 2000
electrical characteristics over recommended ranges of supply voltage and free air temperature (unless
otherwise noted) (continued)
microphone interface
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
VIO
Input offset voltage at MIC1N, MIC2N
See Note 3
–5
5 mV
IIB
Input bias current at MIC1N, MIC2N
–250
250 nA
Ci
Input capacitance at MIC1N, MIC2N
5
pF
Vn
Microphone input referred noise, psophometric weighted,
(C-message weighted is similar)
Micamp 1 gain = 23.5 dB
Micamp 2 gain = 0 dB
3 7.7 µVrms
IOmax
V(mbias)
Output source current – MBIAS
Microphone bias supply voltage (see Note 4)
MICMUTE
1
1.2 mA
2.4 2.5 2.55 V
–80
dB
Input impedance
Fully differential
35
60 100 kΩ
NOTES: 3. Measured while MIC1P and MIC1N are connected together. Less than 5 mV offset results in 0 value code on PCMOUT.
4. Not a JEDEC symbol.
speaker interface
PARAMETER
TEST CONDITIONS
Earphone AMP1 output power (See Note 5)
Fully differential, 110-Ω load,
3-dBm0 output, RGXPA = – 4 dB
VDD = 2.7 V, fully differential, 32-Ω load,
3-dBm0 output, RGXPA = –4 dB
Earphone AMP2 output power (See Note 5)
VDD = 2.7 V, single ended, 32-Ω load,
3-dBm0 output
VOO
IOmax
Output offset voltage at EAR1
Maximum output current for EAR1(rms)
Maximum output current for EAR2 (rms)
Fully differential
3-dBm0 input, 110-Ω load
3-dBm0 input, 32-Ω load
3-dBm0 input
EARMUTE
NOTE 5: Maximum power is with a load impedance of –25%.
MIN TYP MAX UNIT
23.4 31.2 mW
80.5 107.3 mW
10 12.5 mW
±5 ±30 mV
14.6 19.4
50.2 66.9 mA
17.7 22.1
–80
dB
transmit gain and dynamic range, companded mode (µ-law or A-law) or linear mode selected, transmit slope
filter bypassed (see Notes 6 and 7)
PARAMETER
Transmit reference-signal level (0dB)
Overload-signal level (3 dBm0)
Absolute gain error
TEST CONDITIONS
Differential
Differential, normal mode
Differential, extended mode
 0 dBm0 input signal, VDD 10 %
MIN TYP MAX UNIT
175 mVpp
248 mVpp
63 mVpp
–1
1 dB
Gain error with input level relative to gain at
–10 dBm0 MIC1N, MIC1P to PCMO
MIC1N, MIC1P to PCMO at 3 dBm0 to –30 dBm0
–0.5
MIC1N, MIC1P to PCMO at –31 dBm0 to –45 dBm0
–1
MIC1N, MIC1P to PCMO at –46 dBm0 to –55 dBm0 –1.2
0.5
1 dB
1.2
NOTES: 6. 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.
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 88-mVrms.
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