SLAS687A – FEBRUARY 2013 – REVISED FEBRUARY 2013
Electrical Characteristics
(continued)
At 25°C, AVDD = 1.8V, IOVDD = 1.8 V, SPKVDD = 3.6 V, DVDD = 1.8 V, f
S
(audio) = 48 kHz, CODEC_CLKIN = 256 × f
S
,
PLL = Off
PARAMETER
Audio DAC – Stereo Single-Ended Headphone Output
Load = 16Ω (single-ended), Input & Output CM =
0.75V, DOSR = 128, Device Setup MCLK = 256*
fs, Channel Gain = 0dB word length = 16 bits;
Processing Block = PRB_P1 Power Tune =
PTM_P3
0.375
Measured as idle-channel noise, A-weighted
(1)
0-dBFS input, 1-kHz input signal
Mute
(3)
(1) (2)
(2)
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Device Setup
Full-scale output voltage (0 dB)
ICN
THD+N
PSRR
DR
Idle channel noise
Total harmonic distortion + noise
Mute attenuation
Power-supply rejection ratio
Dynamic range, A-weighted
Gain error
P
O
Maximum output power
Vrms
μVms
dB
dB
dB
dB
mW
18.1
-78.2
105.5
48.4
86.8
±0.3
8
16
Ripple on AVDD (1.8 V) = 200 mV
PP
at 1 kHz
–60dB 1kHz input full-scale signal
0dB, 1kHz input full scale signal
R
L
= 32
Ω,
THD+N
≤
–40 dB
R
L
= 16
Ω,
THD+N
≤
–40 dB
DAC DIGITAL INTERPOLATION FILTER CHARACTERISTICS
See for DAC interpolation filter characteristics.
DAC OUTPUT TO CLASS-D SPEAKER OUTPUT; LOAD = 4
Ω
(DIFFERENTIAL)
ICN
Idle channel noise
Output voltage
THD+N
PSRR
Total harmonic distortion + noise
Power-supply rejection ratio
Mute attenuation
BTL measurement, class-D gain = 6 dB, Measured
as idle-channel noise, A-weighted
(1) (2)
BTL measurement, class-D gain = 6 dB, -3dBFS
input
BTL measurement, DAC input = –6 dBFS, class-D
gain = 6 dB
BTL measurement, ripple on SPKVDD = 200 mV
PP
at 1 kHz
Mute
SPKVDD = 3.6 V, BTL measurement, CM = 0.9V,
class-D gain = 18 dB, THD = 10%
SPKVDD = 4.2 V, BTL measurement, CM = 0.9 V,
class-D gain = 18 dB, THD = 10%
P
O
Maximum output power
SPKVDD = 3.6 V, BTL measurement, CM = 0.9V,
class-D gain = 18 dB, THD = 1%
SPKVDD = 4.2 V, BTL measurement, CM = 0.9V,
class-D gain = 18 dB, THD = 1%
SPKVDD = 5.5 V, BTL measurement, CM = 0.9V,
class-D gain = 18 dB
(1)
(2)
(3)
37
1.4
–73.9
55
103
1.1
1.4
0.8
1.1
2
W
μVms
Vrms
dB
dB
dB
Ratio of output level with 1-kHz full-scale sine-wave input, to the output level with the inputs short-circuited, measured A-weighted over a
20-Hz to 20-kHz bandwidth using an audio analyzer.
All performance measurements done with 20-kHz low-pass filter and, where noted, A-weighted filter. Failure to use such a filter may
result 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.
DAC to headphone-out PSRR measurement is calculated as PSRR = 20 X log(∆V
HP
/
∆V
AVDD
).
6
ELECTRICAL SPECIFICATIONS
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