AK4645A datasheet(7/85 Pages) AKM

Part #	AK4645A

Description	Stereo CODEC with MIC/HP-AMP

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Manufacturer	AKM [Asahi Kasei Microsystems]

Direct Link	http://www.akm.com

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7 / 85 page

[AK4645A]

MS0986-J-00

2008/07

- 7 -

アナログ特性

(Ta=25

°C; AVDD=DVDD=TVDD=HVDD=3.3V; AVSS=HVSS=0V; fs=44.1kHz, BICK=64fs;

Signal Frequency=1kHz; 16bit Data; Measurement frequency=20Hz

∼ 20kHz; unless otherwise specified)

Parameter

min

typ

max

Units

MIC Amplifier: LIN1/RIN1/LIN2/RIN2/LIN4/RIN4 pins & LIN3/RIN3 pins (AIN3 bit = “1”);

MDIF1=MDIF2 bits = “0” (Single-ended inputs)

MGAIN1-0 bits = “00”

40

60

80

k

Ω

Input

Resistance

MGAIN1-0 bits = “01”, “10”or “11”

20

30

40

k

Ω

MGAIN1-0 bits = “00”

-

0

-

dB

MGAIN1-0 bits = “01”

-

+20

-

dB

MGAIN1-0 bits = “10”

-

+26

-

dB

Gain

MGAIN1-0 bits = “11”

-

+32

-

dB

MIC Amplifier: IN1+/IN1

−/IN2+/IN2− pins; MDIF1 = MDIF2 bits = “1” (Full-differential input)

Input Voltage (Note 8)

MGAIN1-0 bits = “01”

-

0.228

Vpp

MGAIN1-0 bits = “10”

-

0.114

Vpp

MGAIN1-0 bits = “11”

-

0.057

Vpp

MIC Power Supply: MPWR pin

Output Voltage (Note 9)

2.22

2.47

2.72

V

Load Resistance

0.5

-

k

Ω

Load Capacitance

-

30

pF

ADC Analog Input Characteristics: LIN1/RIN1/LIN2/RIN2/LIN4/RIN4 pins & LIN3/RIN3 pins (AIN3 bit = “1”)

→ ADC → IVOL, IVOL=0dB, ALC=OFF

Resolution

-

16

Bits

(Note 11)

0.168

0.198

0.228

Vpp

Input Voltage (Note 10)

(Note 12)

1.68

1.98

2.28

Vpp

(Note 11, LIN1/RIN1/LIN2/RIN2)

71

83

-

dBFS

(Note 11, LIN3/RIN3/LIN4/RIN4)

-

83

-

dBFS

(Note 12, except for LIN3/RIN3)

-

88

-

dBFS

S/(N+D)

(

−1dBFS)

(Note 12, LIN3/RIN3)

-

72

-

dBFS

(Note 11)

76

86

-

dB

D-Range (

−60dBFS, A-weighted)

(Note 12)

-

95

-

dB

(Note 11)

76

86

-

dB

S/N (A-weighted)

(Note 12)

-

95

-

dB

(Note 11)

75

90

-

dB

Interchannel Isolation

(Note 12)

-

100

-

dB

(Note 11)

-

0.1

0.8

dB

Interchannel Gain Mismatch

(Note 12)

-

0.1

0.8

dB

Note 8. プラス入力ピンとマイナス入力ピンの差分です。ACカップリングコンデンサを各入力ピンにシリー

ズに接続して下さい。MGAIN1-0 bits = “00”のとき差動入力は使用禁止です。IN1+, IN1

−, IN2+, IN2− pin

の最大入力電圧はそれぞれAVDDに比例します。Vin = |(IN+)

− (IN−)| = 0.069 x AVDD

(max)@MGAIN1-0 bits = “01”, 0.035 x AVDD (max)@MGAIN1-0 bits = “10”, 0.017 x AVDD

(max)@MGAIN1-0 bits = “11”.

この電圧を越える信号が入力された場合、ADCの動作は保証できません。

Note 9. 出力電圧はAVDDに比例します。Vout = 0.75 x AVDD (typ)。

Note 10. 入力電圧はAVDDに比例します。Vin = 0.06 x AVDD (typ)@MGAIN1-0 bits = “01” (+20dB), Vin = 0.6 x

AVDD(typ)@MGAIN1-0 bits = “00” (0dB)

Note 11. MGAIN1-0 bits = “01” (+20dB)

Note 12. MGAIN1-0 bits = “00” (0dB)

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