Datasheet

TAS2505
SLAS778A –FEBRUARY 2013–REVISED FEBRUARY 2013 www.ti.com
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 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*
Device Setup fs, Channel Gain = 0dB word length = 16 bits;
Processing Block = PRB_P1 Power Tune =
PTM_P3
Full-scale output voltage (0 dB) 0.375 Vrms
ICN Idle channel noise Measured as idle-channel noise, A-weighted
(1) (2)
18.1 μVms
THD+N Total harmonic distortion + noise 0-dBFS input, 1-kHz input signal -78.2 dB
Mute attenuation Mute 105.5 dB
PSRR Power-supply rejection ratio
(3)
Ripple on AVDD (1.8 V) = 200 mV
PP
at 1 kHz 48.4 dB
DR Dynamic range, A-weighted
(1) (2)
–60dB 1kHz input full-scale signal 86.8
Gain error 0dB, 1kHz input full scale signal ±0.3 dB
R
L
= 32 Ω, THD+N ≤ –40 dB 8
P
O
Maximum output power mW
R
L
= 16 Ω, THD+N ≤ –40 dB 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
ICN Idle channel noise 37 μVms
as idle-channel noise, A-weighted
(1) (2)
BTL measurement, class-D gain = 6 dB, -3dBFS
Output voltage 1.4 Vrms
input
BTL measurement, DAC input = –6 dBFS, class-D
THD+N Total harmonic distortion + noise –73.9 dB
gain = 6 dB
BTL measurement, ripple on SPKVDD = 200 mV
PP
PSRR Power-supply rejection ratio 55 dB
at 1 kHz
Mute attenuation Mute 103 dB
SPKVDD = 3.6 V, BTL measurement, CM = 0.9V,
1.1
class-D gain = 18 dB, THD = 10%
SPKVDD = 4.2 V, BTL measurement, CM = 0.9 V,
1.4
class-D gain = 18 dB, THD = 10%
SPKVDD = 3.6 V, BTL measurement, CM = 0.9V,
P
O
Maximum output power 0.8 W
class-D gain = 18 dB, THD = 1%
SPKVDD = 4.2 V, BTL measurement, CM = 0.9V,
1.1
class-D gain = 18 dB, THD = 1%
SPKVDD = 5.5 V, BTL measurement, CM = 0.9V,
2
class-D gain = 18 dB
(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(∆V
HP
/ ∆V
AVDD
).
6 ELECTRICAL SPECIFICATIONS Copyright © 2013, Texas Instruments Incorporated
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