SLAS687A – FEBRUARY 2013 – REVISED FEBRUARY 2013
3.3
Recommended Operating Conditions
MIN
NOM
1.8
1.8
1.8
MAX
1.95
1.95
5.5
3.6
Ω
Ω
0.5
10
50
400
–40
85
V
RMS
kΩ
MHz
kHz
°C
V
UNIT
over operating free-air temperature range (unless otherwise noted)
AVDD
(1)
DVDD
SPKVDD
(1)
IOVDD
Speaker impedance
Headphone impedance
V
I
Analog audio full-scale input
voltage
Line output load impedance
(in half drive ability mode)
MCLK
(3)
SCL
T
A
(1)
(2)
(3)
Master clock frequency
SCL clock frequency
Operating free-air temperature
Referenced to AVSS
(2)
Referenced to DVSS
(2)
Referenced to SPKVSS
(2)
Referenced to IOVSS
(2)
Load applied across class-D output pins (BTL)
AC-coupled to R
L
AVDD = 1.8 V, single-ended
AC-coupled to R
L
IOVDD = DVDD = 1.8V
1.5
1.65
2.7
1.1
4
16
Power-supply voltage range
To minimize battery-current leakage, the SPKVDD voltage level should not be below the AVDD voltage level.
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.
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
INTERNAL OSCILLATOR—RC_CLK
Oscillator frequency
Audio DAC – Stereo Single-Ended Headphone Output
Load = 16Ω (single-ended), Input & Output CM =
0.9V, DOSR = 128, Device Setup MCLK = 256* fs,
Channel Gain = 0dB word length = 16 bits;
Processing Block = PRB_P1 Power Tune =
PTM_P3
0.5
Measured as idle-channel noise, A-weighted
(1)
0-dBFS input, 1-kHz input signal
Mute
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
(1) (2)
(2)
TEST CONDITIONS
MIN
TYP
8.48
MAX
UNIT
MHz
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
(3)
Dynamic range, A-weighted
Gain error
P
O
(1)
(2)
(3)
Maximum output power
Vrms
μVms
dB
dB
dB
dB
mW
20.7
-78.2
103.7
47.2
88.1
±0.3
11
18
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
).
Copyright © 2013, Texas Instruments Incorporated
ELECTRICAL SPECIFICATIONS
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