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PDF AK4205 Data sheet ( Hoja de datos )
| Número de pieza | AK4205 | |
| Descripción | Ultra Low Noise and Distortion Headphone Amp | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK4205]
AK4205
Ultra Low Noise and Distortion Headphone Amp with Analog Switch
1. General Description
The AK4205 is a stereo headphone amplifier corresponding to high resolution with built-in analog switch
for Hi-Fi mobile. The AK4205 achieves industry’s leading level ultra-low noise and ultra-low distortion
characteristics (THD+N = -118dB).
The AK4205 is available in a small 36-pin QFN package. It can save the mounting area of the board by
including resistors for gain adjustment and low-pass filter.
Application:
Smartphone
Portable AMP
Digital Media Player
USB DAC
2. Features
1. Headphone Amplifier
Full-differential Input
Built-in Resistors for Gain Adjustment: Fixed to +0.5 dB @1 kHz
2nd order Low-pass Filter
Ultra-Low Noise: S/N 124dB
Ultra-Low Distortion: THD+N -118 dB @32 Ω, 34 mW
THD+N -120 dB @600 Ω, 6.7 mW
2. Analog Switch
Selector Switch for Hi-Fi Audio path and Auxiliary path
Ultra-Low Distortion: THD -124dB@32 Ω, 34 mW
2 Vrms Output
Pop & Click Noise Free Switching Control
Built-in Negative Voltage Generator
Mute Function
3. Ta = 40 85C
4. Power Supply:
Positive Power Supply (PVDDA, PVDDB): 6.0 V (typ)
Negative Power Supply (PVEEA, PVEEB): -5.0 V (typ)
Reference Power Supply (RVDD): 6.0 V (typ)
Analog Switch Power Supply (SWVDD): 3.3 V (typ)
5. Package:
36-pin QFN (5 x 5 mm, 0.4 mm pitch)
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[AK4205]
■ Pin Functions
No. Pin Name I/O
Function
1 NINA
I Negative Analog Input A Pin
2 PINA
I Positive Analog Input A Pin
3 AVSSA
- Analog Ground A Pin
4 NC
- No Connect pin. This pin should be connected to VSS.
5 RVDD
- Reference Power Supply, 4.5 ~ 6.5 V
6 RVSS
- Reference Ground Pin
7 AVSSB
- Analog Ground B Pin
8 PINB
I Positive Analog Input B Pin
9 NINB
I Negative Analog Input B Pin
10 NC
- No Connect pin. This pin should be connected to VSS.
11 NC
- No Connect pin. This pin should be connected to VSS.
12 PVEEB
- Headphone Amp Negative Power Supply B Pin, -4.5 ~ -5.5 V
13 AMPOUTB
O Headphone Amp Output B Pin
14 PVDDB
- Headphone Amp Positive Power Supply B Pin, 4.5 ~ 6.5 V
15 NC
- No Connect pin. This pin should be connected to VSS.
16 NC
- No Connect pin. This pin should be connected to VSS.
17 SWINB
I HiFi Path Switch Input B Pin
18 AUXB
I AUX Path Switch Input B Pin
19 SWOUTB
O Switch Output B Pin
20 NC
- No Connect pin. This pin should be connected to VSS.
21 SEL
I
HiFi/AUX Path Select Pin
“H”: HiFi Path (SWINA/B pins), “L”: AUX Path (AUXA/B pins)
22 SWVSS
- Switch Ground Pin
23 SWVDD
- Switch Power Supply Pin, 3.0 ~ 3.6 V
24 CAPSS
O Soft Start Capacitor Terminal Pin
25 NC
- No Connect pin. This pin should be connected to VSS.
26 NC
- No Connect pin. This pin should be connected to VSS.
27 SWOUTA
O Switch Output A Pin
28 AUXA
I AUX Path Switch Input A Pin
29 SWINA
I Hi-Fi Path Switch Input A Pin
30 NC
- No Connect pin. This pin should be connected to VSS.
31 NC
- No Connect pin. This pin should be connected to VSS.
32 PVDDA
- Headphone-Amp Positive Power Supply A Pin, 4.5 ~ 6.5 V
33 AMPOUTA
O Headphone-Amp Output A Pin
34 PVEEA
- Headphone-Amp Negative Power Supply A Pin, -4.5 ~ -5.5 V
35 RSTN
Reset Pin
I When “L”, the AK4205 is held in reset.
The AK4205 must be always reset upon power-up.
36 MUTEN
Mute Control pin
I “H”: Normal Operation
“L”: SWOUTA and SWOUTB pins are mute state.
Exposed Pad
-
The exposed pad on the bottom surface of the package should be
connected to VSS. (Note 2)
Note 1. All digital input pins (SEL, RSTN, MUTEN pins) expect analog input/output pins (NINA, PINA,
PINB, NINB, SWINB, AUXB, AUXA, SWINA) should not be left floating. I/O pins should be
processed appropriately.
Note 2. Exposed Pad is not connected to VSS internally.
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[AK4205]
■ DC Characteristics
(Ta = -40 ~ 85 C; PVDDA = PVDDB = RVDD = 4.5 V ~ 6.5 V, PVEEA = PVEEB = -4.5 V ~ -5.5 V,
SWVDD = 3.0 V ~ 3.6 V; AVSSA = AVSSB = RVSS = SWVSS = 0 V)
Parameter
Symbol Min.
Typ.
Max.
Unit
SEL, MUTEN, RSTN pins
High-Level Input Voltage
VIH 1.44
-
-V
Low-Level Input Voltage
VIL -
- 0.36 V
Input Rising Time
Tr
20 ns
Input Falling Time
Tf
20 ns
Input Leakage Current
Iin -
- 0.5 μA
Output Voltage Hi-Fi Mode (SEL pin = “H”)
(CAPSS pin) AUX Mode (SEL pin = “L”)
2.37 2.5 2.63 V
1.3 1.4 1.5 V
■ Switching Characteristics
(Ta = -40 ~ 85 C; PVDDA = PVDDB = RVDD = 4.5 V ~ 6.5 V, PVEEA = PVEEB = -4.5 V ~ -5.5 V,
SWVDD = 3.0 V ~ 3.6 V; AVSSA = AVSSB = RVSS = SWVSS = 0 V)
Parameter (Figure 7)
Symbol Min.
Typ.
Max.
Unit
Soft Start Timing (RL=32Ω,Css=0.1μF: Note 33)
Turn-on Time
tON 59 ms
Turn-off Time
tOFF
29
ms
Turn-on slope (Vin = 20 mV)
tslON
1.0
V/s
Turn-off slope (offset Vin = 20 mV)
tslOFF
1.0
V/s
Reset Timing (RSTN pin: Note 33)
RSTN Pulse Width (Css = 0.1 μF)
tRST
2
-
- ms
Note 33. Css is a capacitor connected with the CAPSS pin.
■ Headphone-amp Power-up/down Timing
Parameter (Figure 9)
VDD Power up Slope (Note 34)
VEE Power up Slope (Note 35)
VDD Power down Slope (Note 34, Note 36)
VEE Power down Slope (Note 35, Note 36)
Symbol
PUSLDD
PUSLEE
PDSLDD
PDSLEE
Min.
-
-50
-100
-
Typ.
-
-
-
-
Max.
15
-
-
260
Unit
mV/μs
mV/μs
mV/μs
mV/μs
VDD-VEE non-overlap Time
tPU 0
-
- ms
VEE-VDD non-overlap Time
tPD 0
-
- ms
Note 34. RVDD, PVDDA, PVDDB pins
Note 35. PVEEA, PVEEB pins
Note 36. At power down, set the absolute value of the voltages of RVDD, PVDDA and PVDDB so that
they do not fall below the absolute value of the voltage of PVEEA and PVEEB.
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11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AK4205.PDF ] | |
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