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PDF AK4309B Data sheet ( Hoja de datos )
| Número de pieza | AK4309B | |
| Descripción | 16BIT SCF DAC FOR MULTIMEDIA | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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ASAHI KASEI
[AK4309B]
AK4309B
16Bit SCF DAC for Multimedia
General Description
The AK4309B is a 1bit stereo DAC for multimedia audio systems. A 1bit DAC can achieve monotonicity and
low distortion with no adjustment and is superior to traditional R-2R ladder based DACs. In the AK4309B, the
loss of accuracy from clock jitter is also improved by using SCF techniques for on-chip post filter. The
AK4309B includes continuous time filter with single end output and does not need any external parts. The
master clock can be either 256fs or 384fs, supporting various audio environment.
Features
Sampling Rate Ranging from 8kHz to 50kHz
On chip Perfect filtering
• 8 times FIR Interpolator
• 2nd order SCF and CTF
• Total Response: ±0.5dB at 20kHz
On chip Buffer with Single End Output
Master Clock: 256fs or 384fs
High Tolerance to Clock Jitter
TTL Level Digital Interface
THD+N: -84dB
Dynamic Range: 90dB
Output Level: 3.4Vpp
Power Supply: 5V±10%
Low Power Dissipation: 80mW at 5V
Small Package: 20pin SSOP
Pin Compatible with AK4310/4309A
0177-E-00
-1-
1997/6
1 page  
ASAHI KASEI
[AK4309B]
ANALOG CHARACTERISTICS
(Ta=25°C; AVDD,DVDD=5.0V; VREFH=AVDD,VREFL=AVSS; fs=44.1kHz; Signal Frequency=1kHz;
Measurement Bandwidth=10Hz∼20kHz; RL≥10kΩ; unless otherwise specified)
Parameter
min typ max Units
Resolution
16 Bits
Dynamic Characteristics (Note 4 )
THD+N
(0dB Output)
-84 -79 dB
Dynamic Range (-60dB Output, A weight)
85 90
dB
S/N (A weight)
85 90
dB
Interchannel Isolation(1kHz)
80 90
dB
DC Accuracy
Interchannel Gain Mismatch
0.15 0.3
dB
Gain Drift
(Note 5 )
60 - ppm/°C
DC Accuracy
Output Voltage
(Note 6 )
3.23 3.4 3.57 Vpp
Load Resistance
10 kΩ
Power Supplies
Power Supply Current
Normal Operation ( RST = "H")
AVDD
13 18 mA
DVDD
3 5 mA
Power-Down-Mode ( RST = "L")
AVDD+DVDD (Note 7 )
10 50 uA
Power Dissipation (AVDD+DVDD)
Normal Operation
80 115 mW
Power-Down-Mode
(Note 7 )
50 250 uW
Power Supply Rejection
(Note 8 )
50 dB
Notes: 4 . Measured by AD725C(SHIBASOKU). Averaging mode. Refer to the eva board manual.
5 . The voltage on VREFH pin is held +5V externally.
6 . Full-scale voltage(0dB). Output voltage scales with the voltage of VREH-VREFL.
AOUT(typ.@0dB)=3.4Vpp*(VREFH-VREFL)/5.
7 . Power Dissipation in the power-down mode is applied with no external clocks
(MCLK,BICK,LRCK held "H" or "L").
8 . PSR is applied to AVDD,DVDD with 1kHz, 100mVpp. VREF pin is held +5V.
0177-E-00
-5-
1997/6
5 Page 
ASAHI KASEI
1. Grounding and Power Supply Decoupling
[AK4309B]
To minimize coupling by digital noise, decoupling capacitors should be connected to AVDD and DVDD,
respectively. AVDD is supplied from analog supply in system and DVDD is supplied from AVDD via 10Ω
resistor as shown in Figure 3 . Alternatively if AVDD and DVDD are supplied separately, AVDD and DVDD
should be powered at the same time or AVDD should be powered earlier than DVDD. Analog ground and
digital ground should be connected together near to where the supplies are brought onto the printed circuit
board. Decoupling capacitors for high frequency should be placed as near as possible.
2. Voltage reference
The differential Voltage between VREFH and VREFL set the analog output range. VREFH pin is normally
connected to AVDD and VREFL pin is connected to AVSS with a 0.1uF ceramic capacitor. VCOM is a signal
ground of this chip. An electrolytic capacitor of around 10uF in parallel with a 0.1uF ceramic capacitor attached
to these pins eliminates the effects of high frequency noise. No load current may be drawn from VCOM pin. All
signals, especially clocks, should be kept away from the VREF and VCOM pins in order to avoid unwanted
coupling into the AK4309B.
3. Analog Outputs
The analog outputs are also single-ended and centered around the VCOM voltage. The output signal range is
typically 3.4Vpp. AC coupling capacitors of larger than 1uF are recommended. The internal switched-capacitor
filter and continuous-time filter attenuate the noise generated by the delta-sigma modulator beyond the audio
passband. Therefore, any external filters are not required for typical application. The output voltage is a
positive full scale for 7FFFH(@16bit) and a negative full scale for 8000H(@16bit). The ideal output is VCOM
voltage for 0000H(@16bit).
DC offsets on analog outputs are eliminated by AC coupling since analog outputs have DC offsets of VCOM +
a few mV.
0177-E-00
- 11 -
1997/6
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AK4309B.PDF ] | |
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