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PDF AK5355 Data sheet ( Hoja de datos )
| Número de pieza | AK5355 | |
| Descripción | LOW POWER 16-BIT ADC | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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ASAHI KASEI
[AK5355]
AK5355
Low Power 16bit ∆Σ ADC
FEATURES
The AK5355 is a low voltage 16bit A/D converter for digital audio systems. The AK5355 also includes an
Input Gain Amplifier, making it suitable for microphone applications or low-input signal levels. The analog
signal input of the AK5355 is single-ended, eliminating the need for external filters. The AK5355 is housed
in a space-saving 16pin TSSOP or 20pin QFN package.
FEATURES
1. Resolution: 16bits
2. Recording Functions
• Gain Amplifier (0dB / +15dB)
• Digital HPF for DC-offset cancellation (fc=3.4Hz@fs=44.1kHz)
3. ADC Characteristics
• Single-ended Input
• Input Level: 1.8Vpp@VA=3.0V (= 0.6 x VA)
• S/(N+D): 85dB
• DR, S/N: 91dB
4. Master Clock: 256fs/384fs/512fs
5. Audio Data Format: MSB First, 2’s compliment
• 16bit MSB justified or I2S
8. Power Supply
• VA, VD: 2.1 ∼ 3.6V (typ. 3.0V)
9. Power Supply Current: 5mA
10. Ta = -40 ∼ 85°C
11. Package: 16pin TSSOP
20pin QFN (4.2mm x 4.2mm, 0.5mm pitch)
SEL DIF
LIN
RIN
VCOM
VA
VSS
ADC
HPF
Audio I/F
Controller
Clock Divider
LRCK
BCLK
SDTO
VD
PDN
MCLK
MS0113-E-01
-1-
2005/01
1 page  
ASAHI KASEI
[AK5355]
ABSOLUTE MAXIMUM RATINGS
(VSS=0V; Note 1)
Parameter
Symbol
Min
Power Supply Analog
VA -0.3
Digital
VD -0.3
Input Current (Any Pin Except Supplies)
IIN
-
Analog Input Voltage (LIN, RIN pins)
VINA
-0.3
Digital Input Voltage
VIND
-0.3
Ambient Temperature (power applied)
Ta -40
Storage Temperature
Tstg -65
Note 1. All voltages with respect to ground.
max
4.6
4.6
±10
VA+0.3
VD+0.3
85
150
WARNING: Operation at or beyond these limits may results in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
Units
V
V
mA
V
V
°C
°C
RECOMMENDED OPERATING CONDITIONS
(VSS=0V; Note 1)
Parameter
Symbol
min
typ
Power Supply Analog (VA pin)
VA 2.1
3.0
Digital (VD pin)
VD 2.1
3.0
Note 1. All voltages with respect to ground.
max
3.6
VA
WARNING: AKM assumes no responsibility for the usage beyond the conditions in this data sheet.
Units
V
V
MS0113-E-01
-5-
2005/01
5 Page 
ASAHI KASEI
[AK5355]
Digital High Pass Filter
The AK5355 has a Digital High Pass Filter (HPF) to cancel DC-offset in both the ADC and input gain amplifier. The
cut-off frequency of the HPF is 3.4Hz at fs=44.1kHz. This cut-off frequency scales with the sampling frequency (fs).
Input Gain Amplifier
The AK5355 includes an input gain amplifier. The gain can be changed to 0dB or +15dB by using the SEL pin. Input
impedance is 40kΩ typically.
Power down
SEL pin
Gain
L 0dB
H +15dB
Table 2. Input Gain Amplifier
The AK5355 is placed in the power-down mode by bringing PDN “L”. The digital filter is also reset at the same time. This
reset should always be done after power-up. An analog initialization cycle starts after exiting the power-down mode. The
output data SDTO becomes available after 4128 cycles of LRCK clock. During initialization, the ADC digital data
outputs of both channels are forced to a 2’s complement “0”. The ADC outputs settle to the data corresponding to the
input signals at the end of initialization (Settling time equals the group delay time approximately).
PDN
Internal
State
A/D In
(Analog)
A/D Out
(Digital)
Clock In
MCLK,LRCK,BCLK
4128/fs(93.6ms@fs=44.1kHz)
Normal Operation
GD (1)
Power-down
Idle Noise
(2)
“0”data
(3)
Initialize
Normal Operation
GD
“0”data
Idle Noise
Notes:
(1) Digital output corresponding to the analog input is delayed by the Group Delay amount (GD).
(2) A/D output is “0” data in the power-down state.
(3) When the external clocks (MCLK, BCLK and LRCK) are stopped, the AK5355 should be placed in the
power-down state.
Figure 6. Power-down/up sequence example
System Reset
The AK5355 should be reset once by bringing PDN ”L” upon power-up. The AK5355 is powered up and the internal
timing starts clocking by LRCK “↑” after exiting reset and power down state by MCLK. The AK5355 is in the
power-down mode until MCLK and LRCK are input.
MS0113-E-01
- 11 -
2005/01
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AK5355.PDF ] | |
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