2.3.4 Stereo Headphone Output
PARAMETER
TEST CONDITIONS
MIN
90
TYP
1.0
30
MAX
UNIT
0-dB full-scale output voltage
V
RMS
mW
dB
Maximum output power, P
R
R
= 32 Ω
O
L
L
= 16 Ω
40
Signal-to-noise ratio, A-weighted (see Note 4)
Total harmonic distortion
AV
= 3.3 V
97
DD
P
P
= 10 mW
= 20 mW
0.1
1.0
AV
= 3.3 V,
1 kHz output
O
DD
%
O
Power supply rejection ratio
Programmable gain
1 kHz, 100 mV
1 kHz output
50
dB
dB
dB
dB
pp
−73
6
Programmable-gain step size
Mute attenuation
1
1 kHz output
80
NOTE 4: All performance measurements done with 20-kHz low-pass filter and, where noted, A-weighted filter. Failure to use such a filter results
in higher THD + N and lower SNR and dynamic range readings than shown in the Electrical Characteristics. The low-pass filter removes
out-of-band noise, which, although not audible, may affect dynamic specification values.
2.3.5 Analog Reference Levels
PARAMETER
MIN
AVDD/2 − 50 mV
40
TYP
MAX
AVDD/2 + 50 mV
60
UNIT
V
Reference voltage
Divider resistance
50
kΩ
2.3.6 Digital I/O
PARAMETER
MIN
TYP
MAX
UNIT
V
V
V
V
Input low level
Input high level
Output low level
Output high level
0.3 × BV
V
V
V
V
IL
DD
0.7 × BV
0.9 × BV
IH
DD
0.1 × BV
OL
OH
DD
DD
2.3.7 Supply Current
PARAMETER
TEST CONDITIONS
Record and playback (all active)
MIN
TYP
24
MAX
26
20
9
UNIT
20
16
6
Record and playback (osc, clk, and MIC output powered down)
Line playback only
18
7.5
13.5
4.5
1.5
0.01
Total supply current,
No input signal
Record only
11
4
15
6
I
mA
TOT
Analog bypass (line in to line out)
Oscillator enabled
Oscillator disabled
0.8
3
Power down, DV
= 1.5 V,
= 3.3 V
DD
AV
DD
= BV
DD
= HPV
DD
2−4
TI [ TEXAS INSTRUMENTS ]
