TAS2521
SLAS687A –FEBRUARY 2013–REVISED FEBRUARY 2013
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Electrical Characteristics (continued)
At 25°C, AVDD = 1.8V, IOVDD = 1.8 V, SPKVDD = 3.6 V, DVDD = 1.8 V, fS (audio) = 48 kHz, CODEC_CLKIN = 256 × fS,
PLL = Off
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
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
Device Setup
Full-scale output voltage (0 dB)
Idle channel noise
0.375
18.1
-78.2
105.5
48.4
86.8
±0.3
8
Vrms
μVms
dB
ICN
Measured as idle-channel noise, A-weighted(1) (2)
THD+N
Total harmonic distortion + noise 0-dBFS input, 1-kHz input signal
Mute attenuation
Power-supply rejection ratio(3)
Dynamic range, A-weighted(1) (2) –60dB 1kHz input full-scale signal
Mute
dB
PSRR
DR
Ripple on AVDD (1.8 V) = 200 mVPP at 1 kHz
dB
Gain error
0dB, 1kHz input full scale signal
RL = 32 Ω, THD+N ≤ –40 dB
RL = 16 Ω, THD+N ≤ –40 dB
dB
PO
Maximum output power
mW
16
DAC DIGITAL INTERPOLATION FILTER CHARACTERISTICS
See for DAC interpolation filter characteristics.
DAC OUTPUT TO CLASS-D SPEAKER OUTPUT; LOAD = 4 Ω (DIFFERENTIAL)
BTL measurement, class-D gain = 6 dB, Measured
as idle-channel noise, A-weighted(1) (2)
ICN
Idle channel noise
37
1.4
μVms
Vrms
dB
BTL measurement, class-D gain = 6 dB, -3dBFS
input
Output voltage
BTL measurement, DAC input = –6 dBFS, class-D
gain = 6 dB
THD+N
PSRR
Total harmonic distortion + noise
–73.9
BTL measurement, ripple on SPKVDD = 200 mVPP
at 1 kHz
Power-supply rejection ratio
Mute attenuation
55
103
1.1
dB
dB
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%
1.4
0.8
1.1
SPKVDD = 3.6 V, BTL measurement, CM = 0.9V,
class-D gain = 18 dB, THD = 1%
PO
Maximum output power
W
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
2
(1) 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.
(2) 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.
(3) DAC to headphone-out PSRR measurement is calculated as PSRR = 20 X log(∆VHP / ∆VAVDD).
6
ELECTRICAL SPECIFICATIONS
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