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PDF AK4637 Data sheet ( Hoja de datos )
| Número de pieza | AK4637 | |
| Descripción | 24bit Mono CODEC | |
| Fabricantes | AKM | |
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[AK4637]
AK4637
24bit Mono CODEC with MIC/SPK-AMP
1. General Description
The AK4637 is a low power 24-bit Mono CODEC with a microphone and speaker amplifiers.
The AK4637 supports sampling frequency from 8kHz to 48kHz. It is suitable for a wide range of
application from speech signal processing for narrowband, wideband and super wideband to sound
signal processing for audio band.
The input circuits include a microphone amplifier and a high performance digital ALC (automatic level
control) circuit. In addition, the output circuits include a speaker amplifier with 1W output power. It is
suitable for various products as well as portable applications with recording/playback function.
The AK4637 are available in a small 20-pin QFN (3mm x 3mm, 0.4mm pitch: AK4637EN) package saving
mounting area on the board.
Application:
IP Camera
Digital Camera
MFP(Multi Function Printer)
2. Features
1. Recording Functions
Analog Input
1 Monaural Single-ended input or Differential input
Microphone Amplifier: +30dB ~ 0dB, 3dB Step
Microphone Power Supply: 2.0V or 2.4V, Noise Level= 108dBV
Digital ALC (Automatic Level Control)
- Setting Range: +36dB 52.5dB, 0.375dB Step & Mute
ADC Performance: S/(N+D): 83dB, DR, S/N: 88dB (MIC-Amp=+18dB)
S/(N+D): 84dB, DR, S/N: 95dB (MIC-Amp=0dB)
Wind Noise Reduction Filter
5-Band Notch Filter: Include Dynamic Gain Control
Digital Microphone Interface
2. Playback Functions
Digital ALC (Automatic Level Control)
- Setting Range: +36dB ~ 52.5dB, 0.375dB Step & Mute
Sidetone Mixer & Volume Control (0dB ~ 18dB, 6dB Step)
Digital Volume Control
- +12dB ~ 89.5dB, 0.5dB Step & Mute
Mono Speaker Amplifier (with Line Output Switch)
- Speaker Amplifier Porformance: S/(N+D): 75dB@250mW, S/N: 97 dB
- BTL Output
- Output Power: 400mW@8 (AVDD=3.3V), 1W@8 (AVDD=5V)
Analog Mixing: BEEP Input
3. Power Management
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4. Block Diagram
VCOM VSS1 REGFIL AVDD
[AK4637]
DVDD TVDD VSS2
MPWR
Internal
MIC
AIN/IN+/DMDAT
BEEP
BEEP/IN-/DMCLK
PMMP
MIC Power
Supply
Analog Block
AVDD
PMADC
ADC HPF
MIC-Amp
+30~0dB
PMBP
Mono
Speaker
SPP/AOUT
SPN
PMSL
PMDAC
DVOL
DAC SMUTE
LDO
2.3V
Digital Core
MIC-Power SPK-Amp
Control
Register
PMPFIL
HPF2
LPF
4-band EQ
ALC
1 Band EQ
PFVOL
Audio
I/F
PMPLL
PLL
PDN
SDA
SCL
BICK
FCK
SDTO
SDTI
MCKI
Figure 1. Block Diagram
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[AK4637]
8. Electrical Characteristics
■ Analog Characteristics
(Ta=25C; AVDD=3.3V, TVDD=DVDD=1.8V; VSS1=VSS2=0V; fs=48kHz, BICK=64fs; Signal Frequency
=1kHz; 24bit Data; Measurement Bandwidth=20Hz 20kHz; unless otherwise specified)
Parameter
Min.
Typ.
Max.
Unit
MIC Amplifier: AIN pin; MDIF bit = “0” (Single-ended input)
Input Resistance (Note 8)
20 30 40 k
Gain
Gain Setting
0 - +30 dB
Step Width
- 3 - dB
MIC Power Supply: MPWR pin
Output Voltage
MICL bit = “0”
MICL bit = “1”
2.2 2.4 2.6 V
1.8 2.0 2.2
Output Noise Level (A-weighted)
-
-108
- dBV
Load Resistance
2.0 - - k
Load Capacitance
- - 30 pF
PSRR (f = 1kHz) (Note 9)
- 100 - dB
ADC Analog Input Characteristics: AIN pins → ADC (Programmable Filter = OFF) → SDTO
Resolution
- - 24 Bits
Input Voltage (Note 10)
(Note 11)
(Note 12)
-
1.86
0.261
2.07
- Vpp
2.28 Vpp
S/(N+D) (-1dBFS)
(Note 11)
73
83
- dBFS
(Note 12)
-
84 - dBFS
D-Range
(Note 11)
78
88
- dB
(60dBFS, A-weighted)
(Note 12)
-
95 - dB
S/N (A-weighted)
(Note 11)
78
88
- dB
(Note 12)
-
95 - dB
PSRR (f = 1kHz) (Note 9)
- 90 - dB
Note 8. Full Differential Input: IN+=20kΩ(typ), IN-=57kΩ(typ)@MGAIN3-0 bits = “0000” (0dB),
IN+=16kΩ(typ), IN-=244kΩ(typ)@MGAIN3-0 bits = “0110” (+18dB)
Note 9. PSRR applied to AVDD with 500mVpp sine wave.
Note 10. Single-ended Input: Vin = 0.9 x 2.3Vpp (typ) @MGAIN3-0 bits = “0000” (0dB)
Full Differential Input: Vin = (IN+) – (IN–) = 0.9 x 2.3Vpp (typ)
IN+ = 0.45 x 2.3Vpp (typ), IN– = 0.45 x 2.3Vpp (typ)
Note 11. MGAIN3-0 bits = “0110” (+18dB)
Full Differential Input: S/(N+D) = 81dB、DR = S/N = 86dB
Note 12. MGAIN3-0 bits = “0000” (0dB)
Full Differential Input: S/(N+D) = 83dB、DR = S/N = 93dB
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK4637.PDF ] | |
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