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24TQFN-EP

16-Bit Mono Audio Voice Codec

Maxim Integrated 

16-Bit Mono Audio Voice Codec

ELECTRICAL CHARACTERISTICS (continued)

(VAVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between OUTP and OUTN, CREF = 2.2µF, CMICBIAS =

CPREG = CREG = 1µF, AVPRE = +20dB, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK = 8kHz, TA = TMIN to TMAX, unless otherwise noted.

Typical values are at TA = +25°C.) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

MICROPHONE AMPLIFIER

Preamplifier Gain

MIC PGA Gain

MIC PGA Gain Step Size

Common-Mode Rejection Ratio

MIC Input Resistance

AVPRE TA = +25°C

PGAM = 0x14–0x1F

AVMICPGA PGAM = 0x00

PAM = 00

PAM = 01

PAM = 10

PAM = 11

CMRR

RIN_MIC

VIN = 100mVP-P at 217Hz

All gain settings, measured at

MICLN/MICRN

Off

-0.5

0

+0.5

dB

19

20

21

29

30

31

0

dB

+20

1

dB

50

dB

30

50

kΩ

MIC Input Bias Voltage

0.7

0.8

0.9

V

AVPRE = 0dB, AVMICPGA = 0dB,

VIN = 1VP-P, f = 1kHz

-75

Total Harmonic Distortion + Noise THD+N

AVPRE = +30dB, AVMICPGA = 0dB,

VIN = 31mVP-P, f = 1kHz

-66

MIC Power-Supply Rejection

Ratio

MICROPHONE BIAS

AVDD = 1.7V to 1.9V

60

95

PSRR VRIPPLE = 100mV at 1kHz, input referred

82

VRIPPLE = 100mV at 10kHz, input referred

76

MICBIAS Output Voltage

VMICBIAS ILOAD = 1mA, TA = +25°C

1.5

1.55

Load Regulation

ILOAD = 1mA to 2mA

0.2

MICBIAS Line Ripple Rejection

LRR

VRIPPLE = 100mVP-P at 217Hz

82

VRIPPLE = 100mVP-P at 10kHz

81

MICBIAS Noise Voltage

A-weighted

9.5

AUTOMATIC GAIN CONTROL

AGC Hold Duration

AGCHLD[1:0] setting range, FREQ ≠ 0

50

AGC Attack Time

AGCATK[1:0] setting range, FREQ ≠ 0

3

AGC Release Time

AGCRLS[2:0] setting range, FREQ ≠ 0

0.078

AGC Threshold Level

AGCSTH[3:0] setting range, FREQ ≠ 0

-3

NOISE GATE

NG Attack and Release Time

0.5

NG Threshold Level

-72

Noise Gate Threshold Step Size

4

NG Attenuation

0

DIGITAL SIDETONE

Sidetone Gain Adjust

DVST 2dB steps

-60

dB

dB

dB

dB

dB

1.6

V

10

mV

dB

dB

µVRMS

400

ms

200

ms

10

s

-18

dB

s

-16

dB

dB

12

dB

0

dB

Sidetone Phase Delay

PDLY

MIC input to headphone

output, f = 1kHz, HP filter

disabled

8kHz

16kHz

2.2

ms

1.1

6 _______________________________________________________________________________________

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