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PDF AK4317 Data sheet ( Hoja de datos )
| Número de pieza | AK4317 | |
| Descripción | 18BIT SCF DAC WITH ATT & MIXER | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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ASAHI KASEI
[AK4317]
AK4317
18Bit SCF DAC with ATT & MIXER
General Description
The AK4317 is a 1bit stereo DAC with channel separated volume and channel mixer. This DAC also
includes 18bit digital filter and analog LPF. A 1bit DAC can achieve monotonicity and low distortion with
no adjustment and is superior to traditional R-2R ladder based DACs. In the AK4317, the loss of
accuracy from clock jitter is also improved by using SCF techniques for on-chip post filter. Therefore, the
AK4317 is suitable for the system like STB including PLL circuit.
Features
Sampling Rate Ranging from 8kHz to 50kHz
On chip Perfect filtering
• 8 times FIR Interpolator
• 2nd order SCF
• 2nd order CTF
Digital de-emphasis for 32, 44.1, 48kHz sampling
L/R Separated Volume
L/R Mixing
Soft Mute
Audio I/F format : MSB justified, LSB justified, I2S
Master Clock: 256fs or 384fs
High Tolerance to Clock Jitter
THD+N: -86dB
DR: 92dB
Power Supply:4.5 to 5.5V
Small Package: 24pin VSOP
AK4311 Compatible
0172-E-01
-1-
1997/5
1 page  
ASAHI KASEI
[AK4317]
ANALOG CHARACTERISTICS
(Ta=25°C; AVDD,DVDD=5.0V; VREF=AVDD; fs=44.1kHz; Signal Frequency=1kHz; 18bit Input Data;
Measurement Bandwidth=10Hz∼20kHz; RL≥10kΩ; unless otherwise specified)
Parameter
Resolution
Dynamic Characteristics
(Note 4 )
THD+N
(0dB Output)
Dynamic Range (-60dB Output, A weight)
S/N (A weight)
Interchannel Isolation(1kHz)
DC Accuracy
Interchannel Gain Mismatch
Gain Drift
(Note 5 )
DC Accuracy
Output Voltage
Load Resistance
(Note 6 )
Power Supplies
Power Supply Current
Normal Operation (PD="H")
AVDD
DVDD
Power-Down-Mode (PD="L")
AVDD+DVDD
(Note 7 )
Power Dissipation (AVDD+DVDD)
Normal Operation
Power-Down-Mode
(Note 7 )
min typ
18
-80 -86
88 92
88 92
80 90
0.15
20
2.66 2.8
10
max Units
Bits
dB
dB
dB
dB
0.3 dB
- ppm/°C
2.94 Vpp
kΩ
12 18 mA
4 6 mA
10 50 uA
80 120 mW
50 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 VREF pin is held +5V externally.
6. Full-scale voltage(0dB). Output voltage scales with the voltage of VREF pin.
AOUT(typ.@0dB)=2.8Vpp*VREF/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.
0172-E-01
-5-
1997/5
5 Page 
ASAHI KASEI
Zero detection
[AK4317]
When the input data at both channels are continuously zeros for 8192 LRCK cycles, DZF goes to "H".
DZF immediately goes "L" if input data are not zero after going DZF "H".
Soft mute operation
Soft mute operation is performed at digital domain. When SMUTE pin goes "H" or the output mode is set
to "MUTE", the output signal is attenuated by -∞ during 1024 LRCK cycles. When SMUTE pin is returned
to "L" or exiting "MUTE", the mute is cancelled and the output attenuation gradually changes to 0dB
during 1024 LRCK cycles. If the soft mute is cancelled within 1024 LRCK cycles after starting the
operation, the attenuation is discontinued and returned to 0dB. The soft mute is effective for changing the
signal source without stopping the signal transmission
Notes:
{1 The output signal is attenuated by -∞ during 1024 LRCK cycles(1024/fs).
{2 Analog output corresponding to digital input have the group delay(GD).
{3 If the soft mute is cancelled within 1024 LRCK cycles, the attenuation is discontinued and
returned to 0dB.
{4 As the input data at both channels are continuously zeros for 8192 LRCK cycles, DZF goes to
"H".
DZF immediately go to "L" if input data are not zero after DZF "H".
Figure 5 . Soft mute and zero detection
0172-E-01
- 11 -
1997/5
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AK4317.PDF ] | |
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