AK4955 datasheet(8/117 Pages) AKM

Part #	AK4955

Description	24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

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Manufacturer	AKM [Asahi Kasei Microsystems]

Direct Link	http://www.akm.com

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8 / 117 page

[AK4955]

MS1343-E-00

2011/12

- 8 -

ANALOG CHARACTERISTICS

(Ta=25

°C; AVDD=LVDD=SVDD=3.3V, DVDD=TVDD= 1.8V; VSS1=VSS2=VSS3= 0V; fs=48kHz, BICK=64fs;

Signal Frequency=1kHz; 24bit Data; Measurement Bandwidth=20Hz

∼ 20kHz; unless otherwise specified)

Parameter

min

typ

max

Unit

MIC Amplifier: LIN1, RIN1, LIN2, RIN2 pins

Input Resistance

23

33

43

k

Ω

MGAIN3-0 bits = “0000”

-1

0

+1

dB

Gain

MGAIN3-0 bits = “0001”

+4

+5

+6

dB

MGAIN3-0 bits = “0010”

+7

+8

+9

dB

MGAIN3-0 bits = “0011”

+10

+11

+12

dB

MGAIN3-0 bits = “0100”

+13

+14

+15

dB

MGAIN3-0 bits = “0101”

+15

+16

+17

dB

MGAIN3-0 bits = “0110”

+17

+18

+19

dB

MGAIN3-0 bits = “0111”

+20

+21

+22

dB

MGAIN3-0 bits = “1000”

+23

+24

+25

dB

MIC Power Supply: MPWR pin

MICL bit = “0”

2.3

2.5

2.7

V

Output Voltage

MICL bit = “1”

2.0

2.2

2.4

V

Output Noise Level (A-weighted)

-

−108

-

dBV

Load Resistance

0.5

-

k

Ω

Load Capacitance

-

30

pF

PSRR (fin = 1kHz)

-

100

-

dB

ADC Analog Input Characteristics

: LIN1/RIN1/LIN2/RIN2 pins

→ ADC (Programmable Filter = DSP=OFF)

Resolution

-

24

Bits

(Note 12)

-

0.261

-

Vpp

Input Voltage (Note 11)

(Note 13)

1.86

2.07

2.28

Vpp

(Note 12)

71

81

-

dBFS

S/(N+D)

(

−1dBFS)

(Note 13)

-

82

-

dBFS

(Note 12)

78

88

-

dB

D-Range

(

−60dBFS, A-weighted)

(Note 13)

-

96

-

dB

(Note 12)

78

88

-

dB

S/N

(A-weighted)

(Note 13)

-

96

-

dB

(Note 12)

75

90

-

dB

Interchannel Isolation

(Note 13)

-

100

-

dB

(Note 12)

-

0

0.5

dB

Interchannel Gain Mismatch

(Note 13)

-

0

0.5

dB

Note 10. MICL bit must be set to “1” when AVDD=2.7 ~ 3.6V, and it must be set to “0” when AVDD=2.9 ~ 3.6V.

Note 11. Vin = 0.9 x 2.3Vpp (typ) @MGAIN3-0 bits = “0000” (0dB)

Note 12. MGAIN3-0 bits = “0110” (+18dB)

Note 13. MGAIN3-0 bits = “0000” (0dB)

Similar Part No. - AK4955

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Manufacturer	Part #	Datasheet	Description
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