AK4646 参数 Datasheet PDF下载

[AK4646]

ANALOG CHARACTERISTICS

(Ta=25°C; AVDD, DVDD, SVDD=3.3V; AVSS=DVSS=SVSS=0V; fs=44.1kHz, BICK=64fs;

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

∼

20kHz; unless otherwise specified)

min

typ

max

Units

Parameter

MIC Amplifier:

LIN1, RIN1, LIN2, RIN2 pins; MDIF1 = MDIF2 bits =

“0”

(Single-ended inputs)

Input Resistance

20

30

40

kΩ

-

0

-

dB

MGAIN2-0 bits =

“000”

-

+20

-

dB

MGAIN2-0 bits =

“001”

Gain

-

+26

-

dB

MGAIN2-0 bits =

“010”

-

+32

-

dB

MGAIN2-0 bits =

“011”

-

+10

-

dB

MGAIN2-0 bits =

“100”

-

+17

-

dB

MGAIN2-0 bits =

“101”

-

+23

-

dB

MGAIN2-0 bits =

“110”

-

+29

-

dB

MGAIN2-0 bits =

“111”

MIC Amplifier:

IN1+, IN1−, IN2+, IN2− pins; MDIF1 = MDIF2 bits =

“1”

(Full-differential input)

Input Voltage (Note 10)

-

-

0.242

Vpp

MGAIN2-0 bits =

“001”

-

-

0.121

Vpp

MGAIN2-0 bits =

“010”

-

-

0.061

Vpp

MGAIN2-0 bits =

“011”

-

-

0.765

Vpp

MGAIN2-0 bits =

“100”

-

-

0.342

Vpp

MGAIN2-0 bits =

“101”

-

-

0.171

Vpp

MGAIN2-0 bits =

“110”

-

-

0.086

Vpp

MGAIN2-0 bits =

“111”

MIC Power Supply:

MPWR pin

Output Voltage (Note 11)

2.38

2.64

2.90

V

Load Resistance

0.5

-

-

kΩ

Load Capacitance

-

-

30

pF

ADC Analog Input Characteristics:

LIN1/RIN1/LIN2/RIN2 pins

→

ADC

→

IVOL, IVOL=0dB, ALC=OFF

Resolution

-

-

16

Bits

0.178

0.210

0.242

Vpp

Input Voltage (Note 12)

2.10

2.42

Vpp

73

83

-

dBFS

S/(N+D) (−1dBFS)

88

-

dBFS

76

86

-

dB

D-Range (−60dBFS, A-weighted)

95

-

dB

76

86

-

dB

S/N

(A-weighted)

95

-

dB

75

90

-

dB

Interchannel Isolation

100

-

dB

-

0.1

0.8

dB

Interchannel Gain Mismatch

-

0.1

0.8

dB

Note 10. The voltage difference between IN1/2+ and IN1/2− pins. AC coupling capacitor should be inserted in series at

each input pin. Full-differential mic input is not available at MGAIN2-0 bits = “000”. Maximum input voltage of

IN1+, IN1−, IN2+ and IN2− pins is proportional to AVDD voltage, respectively.

Vin = |(IN1/2+)

−

(IN1/2−)| = 0.073 x AVDD (max)@MGAIN2-0 bits =

“001”,

0.037 x AVDD

(max)@MGAIN2-0 bits =

“010”,

0.018 x AVDD (max)@MGAIN2-0 bits =

“011”,

0.232 x AVDD

(max)@MGAIN2-0 bits =

“100”,

0.104 x AVDD (max)@MGAIN2-0 bits =

“101”,

0.052 x AVDD

(max)@MGAIN2-0 bits =

“110”,

0.026 x AVDD (max)@MGAIN2-0 bits =

“111”

Note 11. Output voltage is proportional to AVDD voltage. Vout = 0.8 x AVDD (typ)

Note 12. Input voltage is proportional to AVDD voltage Vin = 0.0636 x AVDD (typ)@MGAIN2-0 bits =

“001”

(+20dB),

Vin = 0.636 x AVDD (typ)@MGAIN2-0 bits =

“000”

(0dB)

Note 13. MGAIN2-0 bits =

“001”

(+20dB)

Note 14. MGAIN2-0 bits =

“000”

(0dB)

MS0557-E-02

-8-

2007/05