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ASAHI KASEI
[AK4341]
AK4341
192kHz 24-Bit Stereo DAC with 2Vrms Output
GENERAL DESCRIPTION The AK4341 is the 24bit DAC with 2Vrms line output for cost and performance based audio systems. Using AKM's multi bit architecture for its modulator, the AK4341 delivers a wide dynamic range while preserving linearity for improved THD+N performance. The AK4341 integrates a combination of SCF and CTF filters increasing performance for systems with excessive clock jitter. The 24 Bit word length and 192kHz sampling rate make this part ideal for a wide range of applications such as digital STB, DVD, AC-3 receiver system, etc. The AK4341 is offered in a space saving 16pin TSSOP package. FEATURES Sampling Rate Ranging from 8kHz to 192kHz 128 times Oversampling (Normal Speed Mode) 64 times Oversampling (Double Speed Mode) 32 times Oversampling (Quad Speed Mode) 24-Bit 8 times FIR Digital Filter SCF with High Tolerance to Clock Jitter 2nd Order Analog LPF Single Ended Output Buffer Digital de-emphasis Soft mute I/F format: 24-Bit MSB justified or I2S Master clock: 256fs, 384fs, 512fs, 768fs or 1152fs (Normal Speed Mode) 256fs or 384fs (Double Speed Mode) 128fs, 192fs (Quad Speed Mode) THD+N: -86dB Dynamic Range: 100dB Power supply: 3.0 +3.6V (DAC), +8.55 +12.6V (Output Buffer) Ta = -20 to 85C Very Small Package: 16pin TSSOP (6.4mm x 5.0mm)
PDN
MCLK
GAIN VDD
SMUTE DEM DIF ACKS
Control Interface
De-emphasis Control
Clock Divider
HVDD VCOM
VSS
LRCK BICK SDTI
Audio Data Interface
8X Interpolator 8X Interpolator
Modulator Modulator
SCF LPF SCF LPF
AOUTL
AOUTR
MS0558-E-01 -1-
2007/03
ASAHI KASEI
[AK4341]
Ordering Guide
AK4341ET AKD4341 -20 +85C 16pin TSSOP (0.65mm pitch) Evaluation Board for AK4341
Pin Layout
MCLK BICK SDTI LRCK PDN SMUTE ACKS DIF 1 2 3 4 5 6 7 8 16 15 14 GAIN VCOM VDD VSS HVDD AOUTL AOUTR DEM
Top View
13 12 11 10 9
MS0558-E-01 -2-
2007/03
ASAHI KASEI
[AK4341]
PIN/FUNCTION
Function Master Clock Input Pin 1 MCLK I An external TTL clock should be input on this pin. 2 BICK I Audio Serial Data Clock Pin 3 SDTI I Audio Serial Data Input Pin 4 LRCK I L/R Clock Pin Power-Down Mode Pin When at "L", the AK4341 is in the power-down mode, held in reset and 5 PDN I AOUTL/R are held in VCOM. The AK4341 must be reset once upon power-up. Soft Mute Pin in parallel control mode 6 SMUTE I "H": Enable, "L": Disable Auto Setting Mode Pin 7 ACKS I "L": Manual Setting Mode, "H": Auto Setting Mode Audio Data Interface Format Pin 8 DIF I "L": 24bit MSB Justified, "H": I2S 9 DEM I De-emphasis Enable Pin "H": Enable, "L": Disable Rch Analog Output Pin 10 AOUTR O When PDN pin = "L", outputs VCOM voltage. Lch Analog Output Pin 11 AOUTL O When PDN pin = "L", outputs VCOM voltage. Output Buffer Power Supply Pin Normally connected to VSS with a 0.1F ceramic capacitor in parallel with a 12 HVDD 10F electrolytic cap. 13 VSS Ground Pin 14 VDD DAC Power Supply Pin DAC Common Voltage Pin 15 VCOM O Normally connected to VSS with a 10F electrolytic cap. Outputs VCOM VDD voltage either PDN pin = "L" or "H". Gain Control Pin. "H": +6dB, "L": 0dB, open: +12dB. 16 GAIN I When PDN="H", the Gain pin is connected to VDD and VSS with 50k resisters and held to VDD/2 when open. When PDN="L", connected to VSS with 50k resister. Note: All input pins except for the GAIN pin should not be left floating. No. Pin Name I/O
MS0558-E-01 -3-
2007/03
ASAHI KASEI
[AK4341]
ABSOLUTE MAXIMUM RATINGS
(VSS=0V; Note 1) Parameter Power Supply Symbol VDD HVDD IIN VIND Ta Tstg min -0.3 -0.3 -0.3 -20 -65 max +6.0 +14 10 VDD+0.3 85 150 Units V V mA V C C
DAC Output Buffer Input Current (any pins except for supplies) Input Voltage Ambient Operating Temperature Storage Temperature Note 1. All voltages with respect to ground.
WARNING: Operation at or beyond these limits may results in permanent damage to the device. Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(VSS=0V; Note 1) Parameter Power Supply Symbol VDD HVDD min +3.0 +8.55 typ +3.3 +9.0 max +3.6 +12.6 Units V V
DAC Output Buffer
*AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
MS0558-E-01 -4-
2007/03
ASAHI KASEI
[AK4341]
ANALOG CHARACTERISTICS (Ta = 25C; VDD = +3.3V, HVDD = +9.0V; fs = 44.1kHz; BICK = 64fs; Signal Frequency = 1kHz; 24bit Input Data; Measurement frequency = 20Hz 20kHz; RL 5k, GAIN =0dB; unless otherwise specified) Parameter min typ max Units Resolution 24 Bits Dynamic Characteristics (Note 2) THD+N (0dBFS) fs=44.1kHz, BW=20kHz -86 -80 dB fs=96kHz, BW=40kHz -86 dB fs=192kHz, BW=40kHz -86 dB Dynamic Range (-60dBFS with A-weighted. Note 3) 94 100 dB S/N (A-weighted. Note 4) 94 100 dB Interchannel Isolation (1kHz) 90 dB Interchannel Gain Mismatch 0.3 dB DC Accuracy Gain Drift 100 ppm/C Output Voltage (Note 5) 1.85 2 2.15 Vrms Load Capacitance (Note 6) 25 pF Load Resistance 5 k Power Supplies Power Supply Current: (Note 7) Normal Operation (PDN pin = "H", fs96kHz) 10 mA VDD 7 mA HVDD Normal Operation (PDN pin = "H", fs=192kHz) 12 18 mA VDD 7 11 mA HVDD Power-Down Mode (PDN pin = "L", Note 8) 10 100 VDD A 10 100 HVDD A Note 2. Measured by Audio Precision (System Two). Refer to the evaluation board manual. Note 3. 98dB at 16bit data Note 4. S/N does not depend on input bit length. Note 5. Full-scale voltage (0dB). Output voltage is proportional to the voltage of VDD, AOUT (typ.@0dB, GAIN =0dB) = 2Vrms x VDD/3.3. Note 6. In case of driving capacitive load, inset the resister between output pin and the capacitive load. Note 7. The current into VDD pin or HVDD pin Note 8. All digital inputs including clock pins (MCLK, BICK and LRCK) are fixed to VSS or VDD, and GAIN pin is fixed to VSS or open.
MS0558-E-01 -5-
2007/03
ASAHI KASEI
[AK4341]
FILTER CHARACTERISTICS (Ta = 25C; VDD = +3.0 +3.6V, HVDD = +8.55 +12.6V; fs = 44.1kHz; DEM = OFF, GAIN =0dB) Parameter Symbol min typ max Units Digital filter (DEM = OFF) PB 0 20.0 kHz Passband 0.05dB (Note 9) 22.05 kHz -6.0dB Stopband (Note 9) SB 24.1 kHz Passband Ripple PR dB 0.02 Stopband Attenuation SA 54 dB Group Delay (Note 10) GD 19.3 1/fs De-emphasis Filter (DEM = ON) De-emphasis Error fs = 32kHz -1.5/0 dB (Relative to 0Hz) fs = 44.1kHz -0.2/+0.2 dB fs = 48kHz 0/+0.6 dB Digital Filter + LPF (DEM = OFF) Frequency Response 20.0kHz fs=44.1kHz FR dB 0.05 40.0kHz fs=96kHz FR dB 0.05 80.0kHz fs=192kHz FR dB 0.05 Note 9. The passband and stopband frequencies scale with fs(system sampling rate). For example, PB=0.4535xfs (@0.05dB), SB=0.546xfs. Note 10. The calculating delay time which occurred by digital filtering. This time is from setting the 16/24bit data of both channels to input register to the output of analog signal. DC CHARACTERISTICS (Ta = 25C; VDD = +3.0 +3.6V, HVDD = +8.55 +12.6V) Parameter Symbol min High-Level Input Voltage (except for GAIN pin) VIH 70%VDD Low-Level Input Voltage (except for GAIN pin) VIL High-Level Input Voltage (for GAIN pin) VIH 90%VDD Low-Level Input Voltage (for GAIN pin) VIL Open (for GAIN pin. Note 11) open Input Leakage Current (Note 12) Iin Note 11. GAIN pin is biased to VDD and VSS via50k (typ) resisters internally. Note 12. Except for the GAIN pin
typ VDD/2 -
max 30%VDD 10%VDD 10
Units V V V V V A
MS0558-E-01 -6-
2007/03
ASAHI KASEI
[AK4341]
SWITCHING CHARACTERISTICS (Ta = 25C; VDD = +3.0 +3.6V, HVDD = +8.55 +12.6V) Parameter Symbol min typ fCLK 2.048 11.2896 Master Clock Frequency dCLK 40 Duty Cycle LRCK Frequency Normal Speed Mode fsn 8 Double Speed Mode fsd 32 Quad Speed Mode fsq 120 Duty Cycle Duty 45 Audio Interface Timing BICK Period tBCK 1/128fsn Normal Speed Mode tBCK 1/64fsd Double Speed Mode tBCK 1/64fsq Quad Speed Mode tBCKL 30 BICK Pulse Width Low tBCKH 30 Pulse Width High tBLR 20 BICK "" to LRCK Edge (Note 13) tLRB 20 LRCK Edge to BICK "" (Note 13) tSDH 20 SDTI Hold Time tSDS 20 SDTI Setup Time Reset Timing tRST 150 RSTN Pulse Width (Note 14) Note 13. BICK rising edge must not occur at the same time as LRCK edge. Note 14. The AK4341 can be reset by bringing PDN pin = "L".
max 36.864 60 48 96 192 55
Units MHz % kHz kHz kHz %
ns ns ns ns ns ns ns ns ns ns
MS0558-E-01 -7-
2007/03
ASAHI KASEI
[AK4341]
Timing Diagram
1/fCLK VIH VIL tCLKH tCLKL
dCLK=tCLKH x fCLK, tCLKL x fCLK
MCLK
1/fs VIH VIL
LRCK
tBCK VIH VIL tBCKH tBCKL
BICK
Clock Timing
LRCK tBLR tLRB
VIH VIL
BICK tSDS tSDH
VIH VIL
SDTI
VIH VIL
Serial Interface Timing
tPD
PDN
VIL
Power-down Timing
MS0558-E-01 -8-
2007/03
ASAHI KASEI
[AK4341]
OPERATION OVERVIEW
System Clock
The external clocks, which are required to operate the AK4341, are MCLK, LRCK and BICK. The master clock (MCLK) should be synchronized with LRCK but the phase is not critical. The MCLK is used to operate the digital interpolation filter and the delta-sigma modulator. There are two methods to set MCLK frequency. In Manual Setting Mode (ACKS pin = "L", Normal Speed Mode), the frequency of MCLK is set automatically. In Auto Setting Mode (ACKS pin = "H"), MCLK frequency is detected automatically and then the internal master clock becomes the appropriate frequency (Table 1). The AK4341 is automatically placed in the power save mode when MCLK stops in the normal operation mode (PDN pin = "H"), and the analog output becomes the VCOM voltage. After MCLK is input again, the AK4341 is powered up. After exiting reset at power-up etc., the AK4341 is in the power-down mode until MCLK and LRCK are input. ACKS pin H LRCK fs 32.0kHz 44.1kHz 48.0kHz 88.2kHz 96.0kHz 176.4kHz 192.0kHz 32.0kHz 44.1kHz 48.0kHz MCLK (MHz) 384fs 512fs 16.3840 22.5792 24.5760 33.8688 36.8640 12.2880 16.9344 18.4320 16.3840 22.5792 24.5760
128fs 22.5792 24.5760
-
192fs 33.8688 36.8640
-
256fs 22.5792 24.5760 8.1920 11.2896 12.2880
768fs 24.5760 33.8688 36.8640 24.5760 33.8688 36.8640
1152fs 36.8640 36.8640 -
Sampling Speed Normal Double Quad Normal
L
Table 1. ACKS pin setting and system clock example
Audio Serial Interface Format
The Audio data is shifted in via the SDTI pin using BICK and LRCK inputs. The DIF pin can selects two serial data modes as shown in Table 2. In all modes the serial data is MSB-first, 2's compliment format and latched on the rising edge of BICK. Mode 0 1 DIF L H SDTI Format 24bit MSB justified 24bit I2S BICK 48fs 48fs Figure Figure 1 Figure 2
Table 2. Audio Data Formats
MS0558-E-01 -9-
2007/03
ASAHI KASEI
[AK4341]
LRCK
0 1 2 22 23 24 30 31 0 1 2 22 23 24 30 31 0 1
BICK (64fs) SDTI Mode 2
23 22 1 0 Don't care 23 22 1 0 Don't care 23 22
23:MSB, 0:LSB
Lch Data
Figure 1. Mode 0 Timing
Rch Data
LRCK
0 1 2 3 23 24 25 31 0 1 2 3 23 24 25 31 0 1
BICK (64fs) SDTI Mode 3
23 22 1 0 Don't care 23 22 1 0 Don't care 23
23:MSB, 0:LSB
Lch Data
Figure 2. Mode 1 Timing
Rch Data
De-emphasis Filter
A digital de-emphasis filter is built-in (tc = 50/15s). DEM pin is internal pull-down pin. Setting DEM pin "H" enables the digital de-emphasis filter. Refer to the section of "FILTER CHARACTERISTICS" regarding the gain error when the de-emphasis filter is enabled. De-emphasis filter is off when double/quad speed mode. DEM pin H L De-emphasis Filter ON OFF
Table 3. De-emphasis Filter Control (Normal Speed Mode)
MS0558-E-01 - 10 -
2007/03
ASAHI KASEI
[AK4341]
Output Gain Setting
Outputs level of AOUTL/AOUTR pin can be selected by GAIN pin. GAIN pin GAIN Input Level Output Level (VDD=3.3V) L 0dB 0dBFS 2Vrms (typ) H +6.0dB -6dBFS 2Vrms (typ) open +12dB -12dBFS 2Vrms (typ) Note 15. Output level of AOUTL/AOUTR pin clips if it exceeds 2Vrms. The input data should be 2Vrms or less as the output level. Table 4. Output Level Setting
(Note 15) (Note 15)
Soft Mute Operation
Soft mute operation is performed at digital domain. When the SMUTE pin goes to "H", the output signal is attenuated by - during 1024 LRCK cycles. When the SMUTE pin is returned to "L", the mute is cancelled and the output attenuation gradually changes to 0dB during 1024 LRCK cycles. If the soft mute is cancelled within the 1024 LRCK cycles after starting the operation, the attenuation is discontinued and returned to 0dB by the same cycle. The soft mute is effective for changing the signal source without stopping the signal transmission.
SMUTE pin 1024/fs 0dB Attenuation (1) (3) 1024/fs
-
GD (2) AOUT GD
Notes: (1) 1020LRCK cycles (1020/fs) at input data is attenuated to -. (2) The analog output corresponding to the digital input has a group delay, GD. (3) If the soft mute is cancelled before attenuating to - after starting the operation, the attenuation is discontinued and returned to ATT level by the same cycle. Figure 3. Soft Mute
System Reset
The AK4341 must be reset once by bringing PDN pin = "L" upon power-up. The AK4341 is powered up and the internal timing starts clocking by LRCK "" after exiting reset and power down state by MCLK. The AK4341 is in the power-down mode until LRCK are input.
MS0558-E-01 - 11 -
2007/03
ASAHI KASEI
[AK4341]
Power-down
The AK4341 is placed in the power-down mode by bringing PDN pin "L" and the analog outputs are VCOM voltage (VDD). Figure 4 shows an example of the system timing at the power-down and power-up.
PDN
Internal State D/A In (Digital)
GD
Normal Operation
Power-down
Normal Operation
"0" data
(1)
GD
D/A Out (Analog)
Clock In
MCLK, LRCK, BICK
(3) (4)
(2)
(3)
(1)
Don't care
External MUTE
(5)
Mute ON
Notes: (1) The analog output corresponding to digital input has the group delay (GD). (2) Analog outputs are VCOM level (VDD) at the power-down mode. (3) Click noise occurs at the edge of PDN signal. This noise is output even if "0" data is input. (4) The external clocks (MCLK, BICK and LRCK) can be stopped in the power-down mode (PDN = "L"). (5) Please mute the analog output externally if the click noise (3) influences system application. The timing example is shown in this figure. Figure 4. Power-down/up Sequence Example
MS0558-E-01 - 12 -
2007/03
ASAHI KASEI
[AK4341]
Reset Function
When the MCLK or LRCK stops during the normal operation (PDN pin ="H"), the AK4341 is placed in the reset mode and its analog outputs are set to VCOM voltage (VDD). When the MCLK and LRCK are restarted, the AK4341 return to the normal operation mode. The BICK can be stopped when MCLK or LRCK is stopped but shouldn't be stopped when MCLK and LRCK are supplied.
PDN pin
Internal State D/A In (Digital) D/A Out (Analog)
(1)
Power-down
Normal Operation
Reset
Normal Operation
Power-down GD Hi-Z
(3) (2) (4) (4)
VCOM GD
(2)
(4)

Clock In
MCLK, BICK, LRCK
(5) MCLK Stop
External MUTE
Clock In
MCLK, BICK, LRCK
(6)
(6)
(6)
(5) (7) LRCK Stop
External MUTE
(6)
(6)
(6)
Notes: (1) PDN pin should be "L" for 150ns or more after power-on. (2) The analog output corresponding to digital input has the group delay (GD). (3) Digital data can be stopped. The click noise after the MCLK and LRCK are input again can be reduced by inputting the "0" data during this period. (4) Click noise occurs within 20usec and 20usec +(34LRCK) after the edges(" ") of the PDN pin and MCLK starting. The noises also occur when MCLK or LRCK is stopped and within 20usec after stopping. (5) Clocks (MCLK, BICK, LRCK) can be stopped in the reset mode (MCLK or LRCK is stopped). (6) Mute externally if the click noises (4) cause problem. (7) The AK4341 detects the stop of LRCK by the ratio MCLK/LRCK > 2048. If the LRCK is input, when LRCK is stopping, then the AK4341 exits the reset mode. Figure 5. Reset Timing Example
MS0558-E-01 - 13 -
2007/03
ASAHI KASEI
[AK4341]
SYSTEM DESIGN
Figure 6 shows the system connection diagram. An evaluation board (AKD4341) is available in order to allow an easy study on the layout of a surrounding circuit.
Master Clock 64fs 24bit Audio Data fs Reset & Power down
1 2 3 4 5 6
MCLK BICK SDTI LRCK PDN SMUTE ACKS DIF
GAIN VCOM VDD
16 15 14 0.1u 13 0.1u 12 11 10 9 + 10u + 10u + 10u
Analog Supply 3.3V Analog Supply 9.0V
Lch Out Rch Out
AK4341
VSS HVDD AOUTL AOUTR DEM
ModeSetting
7 8
Digital Ground
Analog Ground
Figure 6. Typical Connection Diagram (GAIN = 0dB)
MS0558-E-01 - 14 -
2007/03
ASAHI KASEI
[AK4341]
1. Grounding and Power Supply Decoupling
VDD, HVDD and VSS are supplied from analog supply and should be separated from system digital supply. Decoupling capacitor, especially 0.1F ceramic capacitor for high frequency should be placed as near to VDD and HVDD as possible. The differential voltage between VDD and VSS pins set the analog output range. The power-up sequence between VDD and HVDD is not critical.
2. Analog Outputs
The analog outputs are single-ended and centered around the VDD voltage. The output signal range is typically 2Vrms (typ @VDD=3.3V). The internal switched-capacitor filter and continuous-time filter attenuate the noise generated by the delta-sigma modulator beyond the audio passband. The output voltage is a positive full scale for 7FFFFFH (@24bit) and a negative full scale for 800000H (@24bit). The ideal output is VDD voltage for 000000H (@24bit). DC offsets on analog outputs are eliminated by AC coupling since analog outputs have DC offsets of VDD + a few mV. Figure 7 shows an example of the external LPF with 2Vrms (typ) output.
AK4341 10u AOUT 22k 2.2nF 470
Analog Out 2Vrms (typ)
(fc = 154kHz, gain = -0.28dB @ 40kHz, gain = -1.04dB @ 80kHz) Figure 7. External 1st order LPF Circuit Example
MS0558-E-01 - 15 -
2007/03
ASAHI KASEI
[AK4341]
PACKAGE
16pin TSSOP (Unit: mm)
*5.00.1 1.050.05
16
9 *4.40.1 A 6.40.2 0.170.05 Detail A 0.10.1 0-10 0.50.2 0.10
Epoxy Cu Solder (Pb free) plate 2007/03 - 16 -
1 0.220.1
8 0.65
0.13 M
Seating Plane
NOTE: Dimension "*" does not include mold flash.
Package & Lead frame material
Package molding compound: Lead frame material: Lead frame surface treatment:
MS0558-E-01
ASAHI KASEI
[AK4341]
MARKING
AKM 4341ET XXYYY
1) 2)
3) 4)
Pin #1 indication Date Code : XXYYY (5 digits) XX: Lot# YYY: Date Code Marketing Code : 4341ET Asahi Kasei Logo
MS0558-E-01 - 17 -
2007/03
ASAHI KASEI
[AK4341]
Revision History
Date (YY/MM/DD) 06/10/30 07/03/26 Revision 00 01 Reason First Edition Error correction Page 1 Contents FEATURE I/F format: 24bit MSB justified, 24/16 bit LSB justified or I2S 24bit MSB justified or I2S PIN/FUNCTION No.8 "L": Left Justified
3
24 bit MSB Justified
9
AUDIO SERIAL INTERFACE The DIF pin can select four serial data modes as shown in Table 2 The DIF pin can select two serial data modes as shown in Table 2
IMPORTANT NOTICE * These products and their specifications are subject to change without notice. Before considering any use or application, consult the Asahi Kasei Microsystems Co., Ltd. (AKM) sales office or authorized distributor concerning their current status. * AKM assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. * Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. * AKM products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and AKM assumes no responsibility relating to any such use, except with the express written consent of the Representative Director of AKM. As used here: (a) A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. (b) A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. * It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification.
MS0558-E-01 - 18 -
2007/03

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