2−3

2.3.3

Stereo Headphone Output

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

0-dB full-scale output voltage

1.0

VRMS

Maximum output power, PO

RL = 32 Ω

30

mW

RL = 16 Ω

40

mW

Signal-to-noise ratio, A-weighted (see Note 4)

AVDD = 3.3 V

90

97

dB

Total harmonic distortion

AVDD = 3.3 V,

1 kHz output, into

PO = 10 mW

−60

dB

Total harmonic distortion

DD

1 kHz output, into

32

Ω

PO = 20 mW

−40

dB

Power supply rejection ratio

1 kHz, 100 mVpp

50

dB

Programmable gain

1 kHz output

−73

6

dB

Programmable-gain step size

1

dB

Mute attenuation

1 kHz output

80

dB

NOTES:

3. Ratio of output level with 1-kHz full-scale input, to the output level with the input short circuited, measured A-weighted over a 20-Hz

to 20-kHz bandwidth using an audio analyzer.

4. All performance measurements done with 20-kHz low-pass filter and, where noted, A-weighted filter. Failure to use such a filter

results 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.

5. Ratio of output level with 1-kHz full-scale input, to the output level with all zeros into the digital input, measured A-weighted over

a 20-Hz to 20-kHz bandwidth.

2.3.4

Analog Reference Levels

PARAMETER

MIN

TYP

MAX

UNIT

Reference voltage, VMID

AVDD/2 − 50 mV

AVDD/2 + 50 mV

V

Divider resistance, RVMID

40

50

60

k

Ω

2.3.5

Digital I/O

PARAMETER

MIN

TYP

MAX

UNIT

VIL

Input low level

0.3

× BVDD

V

VIH

Input high level

0.7

× BVDD

V

VOL

Output low level

0.1

× BVDD

V

VOH

Output high level

0.9

× BVDD

V

2.3.6

Supply Current

PARAMETER

MIN

TYP

MAX

UNIT

Line playback only (Clk power off, 50

Ω)

6

8

Total supply current, no input signal

Line playback only (Clk power on, 50

Ω)

15

ITOT

Total supply current, no input signal

(3.3 V supply)

Analog bypass (line in to line out)

3

mA

ITOT

(3.3 V supply)

Power down

Oscillator enabled

1.5

mA

Power down

Oscillator disabled

0.01

0.025