Datasheet

TAS2505

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SLAS778A –FEBRUARY 2013–REVISED FEBRUARY 2013

Recommended Operating Conditions (continued)

over operating free-air temperature range (unless otherwise noted)

MIN NOM MAX UNIT

Operating free-air temperature –40 85 °C

3.4 Electrical Characteristics

At 25°C, AVDD = 1.8V, IOVDD = 1.8 V, SPKVDD = 3.6 V, DVDD = 1.8 V, f

(audio) = 48 kHz, CODEC_CLKIN = 256 × f

PLL = Off

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

INTERNAL OSCILLATOR—RC_CLK

Oscillator frequency 8.48 MHz

Audio DAC – Stereo Single-Ended Headphone Output

Load = 16Ω (single-ended), Input & Output CM =

0.9V, DOSR = 128, Device Setup MCLK = 256* fs,

Device Setup Channel Gain = 0dB word length = 16 bits;

Processing Block = PRB_P1 Power Tune =

PTM_P3

Full-scale output voltage (0 dB) 0.5 Vrms

ICN Idle channel noise Measured as idle-channel noise, A-weighted

(1) (2)

20.7 μVms

THD+N Total harmonic distortion + noise 0-dBFS input, 1-kHz input signal -78.2 dB

Mute attenuation Mute 103.7 dB

PSRR Power-supply rejection ratio

(3)

Ripple on AVDD (1.8 V) = 200 mV

at 1 kHz 47.2 dB

DR Dynamic range, A-weighted

(1) (2)

–60dB 1kHz input full-scale signal 88.1

Gain error 0dB, 1kHz input full scale signal ±0.3 dB

= 32 Ω, THD+N ≤ –40 dB 11

Maximum output power mW

= 16 Ω, THD+N ≤ –40 dB 18

(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

/ ∆V

AVDD

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