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DA7212

Ultra-Low Power Stereo Codec

Datasheet

Revision 3.5

05-Jan-2022

CFR0011-120-00

21 of 135

Table 17: True ground headphone amplifier

From DAC_L/DAC_R to (HP_L/HP_R)

Parameter

Description

Conditions

Min

Typ

Max

Unit

VMAX

Full-scale output signal

No load

1.6×VDD_A

VPP

DC output offset

HP Gain < -30 dB

100

µV

PMAX

Maximum power per

channel

VDD_A = 1.6 V

THD < 0.1 %

RLOAD=16

Ω, 1 kHz

L = 23

R = 23

mWRMS

VDD_A = 1.8 V

THD < 0.1 %

RLOAD=16

Ω, 1 kHz

L = 29

R = 29

mWRMS

VDD_A = 2.5 V

THD < 0.1 %

RLOAD=16

Ω, 1 kHz

L = 67

R = 67

mWRMS

RLOAD

LLOAD

CLOAD

Load impedance

400

500

µH

Frequency response

±0.5 dB

20k

Amplitude ripple

20 Hz to 20 kHz

-0.5

+0.5

Programmable gain

-56

Mute attenuation

Programmable gain

step size

1.0

Absolute gain accuracy

0 dB @ 1 kHz

-0.8

+0.8

Input gain L/R-

mismatch

20 Hz to 20 kHz

-0.1

+0.1

Input gain step error

20 Hz to 20 kHz

-0.1

+0.1

SNR

Signal to noise ratio

A-weighted

gain = 0 dB

VDD_A = 2.5 V

VDD_A = 1.8 V

RLOAD=16

100

VNOISE

Output noise level

20 to 20 kHz,

non A-weighted

gain < -20 dB

2.5

µVrms

THD+N

Total harmonic

distortion plus noise

VDD_A = 1.6 V

-5 dBFS

RLOAD=16

-87

PSRR with

respect to

VDD_A

Power supply rejection

ratio

20 Hz

– 2 kHz

2 kHz

– 20 kHz

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