Document
ASAHI KASEI
[AK4525]
AK4525
20Bit Stereo ∆Σ ADC & DAC with X’ tal Osc
GENERAL DESCRIPTION
The AK4525 has a dynamic range of 100dB and is well-suited middle-range MD, surround system, musical instruments and car audio. Analog inputs are full-differential with single-end capability. Analog outputs are single-ended. The AK4525 has X’ tal oscillation circuit and master mode.
FEATURES
o ∆Σ Stereo ADC - 64x Oversampling - Sample Rate Ranging from 32kHz to 48kHz - S/(N+D): 92dB - Dynamic range, S/N: 100dB - Digital HPF for offset cancellation
o ∆Σ Stereo DAC - 128x Oversampling - Sampling Rate Ranging from 32kHz to 48kHz - 2nd order SCF + 2nd order CTF - Digital de-emphasis for 32kHz, 44.1kHz, 48kHz sampling - S/(N+D): 90dB - Dynamic Range, S/N: 100dB - Soft Mute
o High Jitter Tolerance o Master Clock: 256fs, 384fs, 512fs o X’ tal Oscillation circuit o Master/Slave Mode o Analog Power Supply: 4.5 to 5.5V, Digital Power Supply: 3.1 to 5.5V
VA AGND VD DGND
CMODE
AINL+ AINLAINR+ AINRVREFH VCOM
AOUTL
AOUTR
∆Σ Modulator
Decimation Filter
HPF
∆Σ Modulator
Decimation Filter
HPF
Clock
Gen & Divider
Common Voltage
Serial I/O Interface
LPF
∆Σ Modulator
8x Interpolator
LPF
∆Σ Modulator
8x Interpolator
MCKO XTI XTO LRCK SCLK
SDTO SDTI
DIF0 DIF1
SMUTE M/S
PDN
DEM0 DEM1
MS0053-E-00
-1-
2000/9
ASAHI KASEI
n Ordering Guide AK4525VF AKD4525
n Pin Layout
VREFH AINR+ AINRAINL+ AINLVA AGND XTI XTO DIF0 DIF1 LRCK SCLK SDTI
-40 ∼ +85°C
28pin VSOP (0.65mm pitch)
Evaluation Board for AK4525
[AK4525]
1 2 3 4
5 AK4525
6
7 Top View
8 9 10 11 12 13 14
28 VCOM 27 AOUTR 26 AOUTL 25 CMODE 24 PDN 23 DGND 22 VD 21 MCKO 20 M/S (Internal Pull-down) 19 TST 18 DEM1 17 DEM0 16 SMUTE 15 SDTO
n Difference with AK4522 and AK4523
Crystal Oscillator Master Mode Digital Power Supply Ambient Operating Package
AK4522
Not available Not available 2.7 ∼ 5.5V -10 ∼ 70°C 24pin VSOP
AK4523
Not available Not available 3.0 ∼ 5.5V -40 ∼ 85°C 28pin VSOP
AK4525
Available Available 3.1 ∼ 5.5V -40 ∼ 85°C 28pin VSOP
MS0053-E-00
-2-
2000/9
ASAHI KASEI
[AK4525]
PIN/FUNCTION
No. Pin Name 1 VREFH
2 AINR+ 3 AINR4 AINL+ 5 AINL6 VA 7 AGND 8 XTI 9 XTO 10 DIF0 11 DIF1 12 LRCK 13 SCLK 14 SDTI 15 SDTO 16 SMUTE
17 DEM0 18 DEM1 19 TST
20 M/S
21 MCKO 22 VD 23 DGND 24 PDN 25 CMODE
26 AOUTL 27 AOUTR 28 VCOM
I/O Function
I Positive Voltage Reference Input Pin, VA
Used as a positive voltage reference by ADC & DAC. VREFH should be connected
externally to filtered VA.
I Rch Analog Positive Input Pin
I Rch Analog Negative Input Pin
I Lch Analog Positive Input Pin
I Lch Analog Negative Input Pin
- Analog Power Supply Pin
- Analog Ground Pin
I X’tal Input Pin
O X’tal Output Pin
I Audio Data Interface Format 0 Pin
I Audio Data Interface Format 1 Pin
I/O Input/Output Channel Clock Pin
I/O Audio Serial Data Clock Pin
I Audio Serial Data Input Pin
O Audio Serial Data Output Pin
I Soft Mute Pin
When this pin goes “H”, soft mute cycle is initiated.
When returning “L”, the o.