Datasheet

TAS2521
www.ti.com SLAS687A –FEBRUARY 2013–REVISED FEBRUARY 2013
3.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
AVDD
(1)
Referenced to AVSS
(2)
1.5 1.8 1.95
Power-supply voltage range
DVDD Referenced to DVSS
(2)
1.65 1.8 1.95
V
SPKVDD
(1)
Referenced to SPKVSS
(2)
2.7 5.5
IOVDD Referenced to IOVSS
(2)
1.1 1.8 3.6
Speaker impedance Load applied across class-D output pins (BTL) 4 Ω
Headphone impedance AC-coupled to R
L
16 Ω
Analog audio full-scale input
V
I
AVDD = 1.8 V, single-ended 0.5 V
RMS
voltage
Line output load impedance
AC-coupled to R
L
10 kΩ
(in half drive ability mode)
MCLK
(3)
Master clock frequency IOVDD = DVDD = 1.8V 50 MHz
SCL SCL clock frequency 400 kHz
T
A
Operating free-air temperature –40 85 °C
(1) To minimize battery-current leakage, the SPKVDD voltage level should not be below the AVDD voltage level.
(2) All grounds on board are tied together, so they should not differ in voltage by more than 0.2 V maximum for any combination of ground
signals. By use of a wide trace or ground plane, ensure a low-impedance connection between AVSS and DVSS.
(3) The maximum input frequency should be 50 MHz for any digital pin used as a general-purpose clock.
3.4 Electrical Characteristics
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
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
PP
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
R
L
= 32 Ω, THD+N ≤ –40 dB 11
P
O
Maximum output power mW
R
L
= 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
HP
/ ∆V
AVDD
).
Copyright © 2013, Texas Instruments Incorporated ELECTRICAL SPECIFICATIONS 5
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