AK2301A

CONTENT

- BLOCK DIAGRAM…………………………………… 1 - PIN CONDITION……………………………………… 3 - PIN FUNCTION…………………………………….. 4 - ABSOLUTE MAXIMUM RATINGS………………… 5 - RECOMMENDED OPERATING CONDITON ……. 5 - ELECTRICAL CHARACTERESTICS…………….… 5 - PACKAGE INFORMATION……………………….… 10 - PIN ASSIGNMENT…………………………………… 11 - MARKINGS…………………………………….…… 11 - CIRCUIT DESCRIPTIONS………………………...… 12 - FUNCTIONAL DESCLIPTIONS………………..…… 13 - - - - - -

PCM CODEC………………………...………… 13 PCM INTERFACE………………………..……… 14 LongFrame/ShortFrame…....………….……… 14 MUTE…………………………………………… 16 RESET SEQUENCE………………………..…… 17 Universal op-amps………………………..……. 18

ITEMS PAGE

- APPLICATION CIRCUIT EXAMPLE ……………… 19

2 2005/8

ASAHI KASEI [AK2301A]

PIN CONDITIONS Pin#

15 16 14 7 8 9 6 19 5 3 2 4 23 22 18

Name

VFTN VFTP GST GSR VFR VR VDD VSS FS BCLK DX DR

MUTEN RSTN VREF

I/O

I I O O I O - - I I O I I I O

Pin type

Analog Analog Analog Analog Analog Analog CMOS CMOS CMOS CMOS CMOS CMOS Analog

AC load (MAX.)

50pF 40pF 40pF 50pF

DC load (MIN.)

AC load(*1) 10kΩ(*2) AC load(*1)

8kΩ

AC load(*1)

8kΩ

Output status (mute)

Remarks

- External capacitance 1.0uF or more - External capacitance 0.33uF±40％( Includes temperature characteristic) - External capacitance 1.0uF or more - 150uA load max

Analog ground

Hi-Z

20

PLLC

O

Analog

17

TAGND

11 12 13 10 21 24 1

AMP2I AMP1I AMP1O AMP2O Test1 Tset2 Test3

O I I O O I I I

Analog Analog Analog Analog Analog CMOS CMOS CMOS

40pF 40pF

AC load(*1)

8kΩ AC load(*1)

8kΩ

- Tie to the VSS - Tie to the VSS - Tie to the VSS

*1)AC load is a load against AGND. This value includes a feedback resistance of input/output op-amps.

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ASAHI KASEI [AK2301A]

PIN FUNCTION Pin types

NIN: Normal input AIN: Analog input

Pin# Name 15 VFTN

16 14 7 8 9 6 19 5

VFTP GST GSR VFR VR VDD VSS FS

TOUT: Try state output AOUT: Analog output

PWR: Power / Ground

3 BCLK

2 DX

4 23 22

DR MUTEN RSTN

18 VREF

20 PLLC

17 TAGND

12 AMP1I 11 AMP2I 13 AMP1O AOUT Output of the universal OP amp 10 AMP2O 21 TEST1 NIN Test pins (“H”=test mode) 24 TEST2 Please tie to VSS 1 TEST3

*) When stop the BCLK and FS, please set RSTN=“L”.

Type Function AIN Negative analog onput of transmit OP amp.

Diffelential or signal amplifire is composed with the VFTP and the exernal registers. Transmit gain is defined by the ratio of the external registers. AIN Positive analog input of the transmit OP amp. AOUT Output of the transmit OP amp.

The external feedback resister is connected between this pin and VFTP.

AOUT Output of the receive OP amp.

Receive gain is defined by the ratio of the external registers. The differential output can be composed with using the VR. AIN Negative analog input of the receive OP amp.

AOUT Analog output of the D/A converter equivalent to the received PCM code. PWR Positive supply voltage

+3.3V supply

PWR Ground (0V)

NIN Frame sync input

This clock is input for the internal PLL which generates the internal system clocks. FS must be 8kHz clock which synchronized with BCLK and do not stop feeding. *

NIN Bit clock of PCM data interface

This clock defines the input/output timing of DX and RX.

The frequency of BCLK should be 256kHz or 512kHz and do not stop feeding. *

TOUT Serial output of PCM data

The PCM data is synchronized with BCLK. This output remains in the high impedance except for the period in which PCM data is transmitted. NIN Serial input of PCM data

The PCM data is synchronized with BCLK. NIN Mute setting pin

“L” level forces both A/D, D/A output to mute state. NIN Reset signal input pin

Reset operation starts by low input. This pin is used for the initialization at the power up.Please use MUTEN pin together to avoid the popping sound output until the LSI finish the initialization after the power up. (Refer to P.13)

AOUT Analog ground output

External capacitance (1.0µF or more) should be connected between this pin and VSS. Please do not connect external load to this pin.

AOUT PLL loop filter output

External capacitance (0.33µF±40%: Includes temperature characteristic) should be connected between this pin and VSS. AIN Analog ground output for transmit OP amp

150µA load max. External capacitance (1.0µF or more) should be connected between this pin and VSS. This pin is used as an analog ground for transmit OP amp (AMPT).

AIN Negative input of the universal OP amp

4 2005/8

ASAHI KASEI [AK2301A]

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol min max

Power supply voltage Analog/Digital power supply VDD -0.3 4.6 Digital input voltage VTD -0.3 VDD+0.3 Analog input voltage VTA -0.3 VDD+0.3 Input current (except power supply pins) IIN -10 10 Storage temperature Tstg -55 125 Warning: Exceeding absolute maximum ratings may cause permanent damage. Normal operation is not guaranteed at these extremes.

RECOMMENDED OPERATING CONDITIONS

Parameter Symbol min typ max

Power supply voltage VDD 3.0 3.3 3.6 Analog/Digital power supply Ambient operating temperature Ta -40 85 Frame sync frequency *) FS -1.0% 8 +1.0% Note) All voltages reference to ground: VSS = 0V

*) All the characteristics of the CODEC is defined by 8kHz FS.

ELECTRICAL CHARACTERISTICS

Unless otherwise noted, guaranteed for VDD = +3.3V±0.3V, Ta = -40~+85℃, FS=8kHz, VSS=0V

DC Characteristics

Parameter Symbol Conditions min typ Max

Power Consumption PDD1 All putput unloaded

10 15 BCLK=512kHz *1) Output high voltage Output low voltage Input high voltage Input low voltage Input leakage current Analog ground output

VOH

VOL VIH VIL ILL VRG

IOH＝-1.6mA

IOL＝1.6mA

0.8VDD 0.7VDD

-10 1.4 -10

1.5

0.4 0.3VDD +10 1.6 +10

Units

V V V ｍＡ ℃

Units V ℃ kHz

Unit mA V V V V uA V uA

Output leakage current ILT Tri-state mode

*1) VFTN/P=1020Hz@0dBm0 input, DR=1020Hz@0dBm0 Code input

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ASAHI KASEI [AK2301A]

PCM INTERFACE (Long Frame, Short Frame)

All timing parameters of the output pins are measured at VOH = 0.8VDD and VOL = 0.4V. Input pins are measured at VIH = 0.7VDD and VIL = 0.3VDD.

AC Characteristics

Parameter

FS Frequency BCLK Frequency

BCLK Pulse width (High/Low) (BCLK=32xFS=256kHz) BCLK Pulse width (High/Low) (BCLK=xFS=512kHz) Rising/Falling Time: (BCLK,FS, DX,DR) Hold Time: BCLK Low to FS High Setup Time: FS High to BCLK Low Setup Time: DR to BCLK Low Hold Time: BCLK Low to DR

Delay Time: BCLK High to DX valid Note1)

Symbol fPF fPB tWBH tWBL tWBH tWBL tRB tFB tHBF tSFB tSDB tHBD tDBD

Min -1.0% -

Typ 8

32FS/ FS

Max Unit Ref Fig +1.0% kHz -

kHz us us ns

ns Fig1,2 ns ns ns ns ns

1.563 1.953 2.344 0.781 0.977 1.172 60 60 60 60 0 0

40 60 60

Delay Time: BCLK High to DX High-Z Note1) tDZC Long Frame

Hold Time: 2 period of BCLK Low to FS Low

Delay Time: FS or BCLK High, whichever is later,to DX valid 注1）

FS Pulse Width Low Short Frame

Hold Time: BCLK Low to FS Low Setup Time: FS Low to BCLK Low

tHBFS tSFBS

nd

tHBFL tDZFL tWFSL

60 1

60

ns ns

BCLK Fig1

60 60

ns ns

Fig2

Note1) Measured with 50pF load capacitance and 0.2mA drive.

6 2005/8

ASAHI KASEI [AK2301A] Interface Timing tFBtRBtBDtBD1/fPBBCLKtSFBtHBFLtDZFLMSBMSB23tSDB4tHBD45671456FSDXDRtHBFtDBD714tDZC23FS1/fPFtWFSL図1. Long Frame tFBtRBtBDtBD1/fPB BCLKtSFBtHBFStSFBSFStHBFtDBDMSBMSB23tSDB4tHBD455tDBD6714tDZCDXDR236714 図2. Short Frame 7 2005/8 ASAHI KASEI [AK2301A] CODEC * The receive and transmit op-amp’s characteristics are measured at the 0dB gain. The frequency specifications when FS deviation from 8kHz are as follows: UsedFS×noted frequency specification =Effective frequency specification 8k[Hz]Conditions VFTP,VFTN 0dBm0@1020Hz input → DX 3.14dBm0 0dBm0@1020Hz input DR → VR 3.14dBm0 Conditions Relative to: 0.05kHz 0dBm0@1020Hz 0.06kHz 0.2kHz 0.3～3.0kHz 3.4kHz 4.0kHz Relative to: 0～3.0kHz 0dBm0@1020Hz 3.4kHz 4.0kHz 1020Hz Tone C-message 1020Hz Tone C-message Conditions 0dBm0 min -0.6 -0.6 min 30 26 0 -0.15 0 14 -0.15 -0.8 14 min 70 typ 0.531 － 0.762 0.531 － 0.762 typ － － － － － － － － － typ 75 max 0.6 0.6 max － － 1.8 0.15 0.8 － 0.15 0.8 － max － Unit Vrms dB Vrms Vrms dB Vrms Unit dB dB Unit dB dB Absolute Gain Parameter Analog input level Absolute transmit gain Maximum overload level Analog output level Absolute receive gain Maximum overload level Frequency response Parameter Transmit Frequency response （Ａ→Ｄ） VFTP,VFTN → DX Receive Frequency response （Ｄ→Ａ） DR → VR Distortion Parameter Transmit signal to Distortion （Ａ→Ｄ） VFTP,VFTN → DX Receive signal to Distortion （Ｄ→Ａ） DR → VR 0dBm0 70 75 － 8 2005/8 ASAHI KASEI [AK2301A]

Noise

Parameter

Idle channel noise A→D (*1) VFTP,VFTN → DX

Idle channel noise D→A(*2) DR → VR PSRR

Transmit path

Conditions

C-message C-message

min － － － －

typ 8 5 55 55

max 13 10 － －

Units dBrnC0 dBrnC0 dB dB

VDD=3.3V/±66mVop f=0～10kHz

PSRR VDD=3.3V/±66mVop Receiver path f=0～10kHz (*1) Analog input is set to the analog ground level (*2) Digital input is set to the +0 CODE

Crosstalk

Parameter Conditions

Transmit to receive VFTN 0dBm0@1020Hz VFTP,VFTN → VR,GSR DR = 0-Code Receive to transmit DR=0dBm0@1020Hz code level DR → DX VFTP,VFTN = 0 Vrms

Transmit op-amp characteristics: AMPT

Parameter Conditions

Load resistance AC load, Including feedback resistance Load capacitance Gain Inverting amplifiers

Receive signal output characteristics: VR

Parameter Conditions Output voltage (AGND level) PCM +0 code input

Load resistance AC load

Load capacitance

Receive op-amp characteristics: AMPR

Parameter Conditions

Load resistance AC load, Including feedback resistance Load capacitance

0dB setting, 1020Hz@0dBm0 input

SINAD VR, GSR differential output

With C-message

Gain Inverting amplifire Output voltage swing DR = 3.14dBm0 digital code input

Universal op-amp characteristics: AMP1,2

Parameter Conditions

Load resistance AC load, Including feedback resistance Load capacitance

+6dB setting, 1020Hz@1.125Vp-p input

SINAD

5Hz~30kHz measurement

Gain Inverting amplifier Output voltage swing

+6dB setting, 1020Hz@1.125Vp-p input

min － －

typ － －

max -75 -75

Units dB dB

min 10 － -12

typ － － －

max － 50 6

Units kΩ pF dB

min － 8 －

typ 1.5 － －

max － － 40

Units V kΩ pF

min 8 － 70 -12 －

typ － － 75 － 2.15

max － 40 － 6 －

Units kΩ pF dB dB Vp-p

min 8 － 62 -12 2.1

typ － － 87 － 2.25

max － 40 － 6 －

Units kΩ pF dB dB Vp-p

9 2005/8

ASAHI KASEI [AK2301A]

PACKAGE INFORMATION

24pin VSOP

10 2005/8

ASAHI KASEI [AK2301A] PIN ASSIGNMENT 24pin VSOP TEST3 24 1 TEST2 DX23 2 MUTEN BCLK22 3 RSTN DR21 4 TEST1 FS20 5 PLLC VDD19 VSS 6 GSR18 VREF 7 VFR 17 TAGND 8 VR 16 VFTP 9 AMP2O15 VFTN 10 AMP2I14 GST 11 AMP1IAMP1O 13 12 TEST1, TEST2, TEST3 are test pins. Please tie them to the VSS. MARKING (1) 1pin sign (2) Date Code: 5digit XXXXX (3) Marketing Code: AK2301A (4) AKM logo (4)(3)(1)AKMAK2301AXXXXX(2) 11 2005/8 ASAHI KASEI [AK2301A]

CIRCUIT DESCRIPTION

BLOCK AMPT

FUNCTION

Op-amp for input gain adjustment. This op-amp is used as an inverting or

differential amplifier. Adjusting the gain with external resistors. The resistor should be larger than 10kΩ for the feedback resistor. VFTN: Negative op-amp input. VFTP: Positive op-amp input. GST: Op-amp output.

Op-amp for output gain adjustment. This op-amp is used as an inverting amplifier. Adjusting the gain with external resistors. The combined resistor larger than 8kΩ is recommended for the feedback and the output load VFR: Negative op-amp input. GSR: Op-amp output.

VR and GSR can be used as the differential output.

Integrated anti-aliasing filter which prevents signals around the sampling rate from folding back into the voice band. AAF is a 2nd order RC active low-pass filter.

Converts the analog signal to 14bit PCM data. The band limiting filter is also intergrated.

Converting the 14bit PCM data from the DR to the analog signal. Output of the D/A coverter is fed into the SMF to suppress the high frequency element.

Extracts the inband signal from D/A output. It also corrects the sinx/x effect of the D/A output.

Provide the stable analog ground voltage using an on-chip band-gap reference circuit which is temperature compensated. The output voltage is 1.5V for 3.3V An external capacitor of 1.0uF or larger should be connected between VREF and VSS to stabilize analog ground (VREF). Please do not connect external load to this pin. TAGND pin is used as the analog ground level output for the AMPT. An external capacitor of 1.0uF or larger should be connected between TAGND and VSS to stabilize analog ground.

For the PCM data rate, 256kHz or 512kHz are available. The 14bit PCM data is input/output by the 2’s compliment 16bit serial data format. Two kinds of data

format (Long Frame/Short Frame) are available. Each data format is automatically detected by AK2301A.

PCM data is input to DR pin and output from DX pin.

Universal op-amp for the filter of the external voice path. The maximum load is 8kΩ (including the feedback resistor and AC load). These op-amps are assumed as using for the inverting LPF with 20kHz cut off frequency.

AMPR

AAF CODEC A/D CODEC D/A SMF BGREF

PCM I/F

AMP1, AMP2

12 2005/8

ASAHI KASEI [AK2301A]

FUNCTIONAL DESCRIPTIONS

PCM CODEC

- A/D

Analog input signal is converted to 14bit PCM data. The analog signal is fed to the anti-aliasing filter (AAF) before the converting PCM data, to prevent signals around the sampling rate from folding back into the voice band. The converted PCM data passes through the band limiting filter which Frequency response is designated in page8, and output from the DX pin with MSB first format. It is synchronized with rising edge of the BCLK. This PCM data is 2’s compliment 2digit data and full scale is defined as 3.14dBm0. The analog input of 0.762Vrms is converted to a digital code of 3.14dBm0.

- D/A

Input PCM data from the DR pin is through the digital filter which Frequency response is designated in page8, and converted analog signal. This analog signal is removed the high frequency element with SMF (fc=30kHz typ) and output from the VR pin. The input PCM data is 2’s compliment 2digit data and full scale is defined as 3.14dBm0. When the input signal is 3.14dBm0, the level of the analog output signal becomes 0.762Vrms.

- PCM digital code

The relation ship between the analog signal and the 14bit linear code. Signal level 14bit linear CODE (MSB First) +Full code 01 1111 1111 1111 Peak value of the PCM 0dBm0 CODEC 01 0110 0100 1010 PCM 0-CODE 00 0000 0000 0000 -Full scale 10 0000 0000 0000

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ASAHI KASEI [AK2301A]

PCM Data Interface

AK2301A supports the following 2 PCM data formats - Long Frame Sync (LF) - Short Frame Sync (SF)

PCM data is interfaced through the pin (DX, DR).

In each case, PCM data is interfaced by the 2’s compliment 2digit data with 16bit MSB first format. However, internal CODEC is 14bit format operation, then the lowest 2bits output become to “L” level. For the input, the lowest 2bits are ignored.

Selection of the interface format

The AK2301A automatically selects the Long Frame/Short frame by means of detecting the length frame signal.

LONG FRAME (LF) / SHORT FRAME (SF)

-Automatic LF/SF detection

AK2301A monitors the duration of the “H” level of FS and automatically selects LF or SF interface format.

Period of FS=”H” More than 2 clocks of BCLK 1 clock of BCLK

Frame type

LF SF

Timing of the interface

16bit PCM data is accommodated in 1 flame (125µs) defined by 8kHz frame sync signal. Although there are 4time slot at maximum in 8kHz frame (when BCLK = 512kHz), PCM data for AK2301A occupies first time slot.

14 2005/8

ASAHI KASEI [AK2301A] - Frame sync signal （FS） 8kHz reference signal. This signal indicated the timing and the frame position of 8kHz PCM interface. All the internal clock of the LSI is generated based on this FS signal. -Bit clock （BCLK） BCLK defines the PCM data rate. BCLK rate is 256kHz or 512kHz. This clock must be synchronized with FS. LongFrame FS BCLK DX DR Don’t care 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 ９９10 10 11 11 12 12 13 13 14 14 L LDon’t care ShortFrame FS BCLK DX DR Don’t care 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 ９９10 10 11 11 12 12 13 13 14 14 L LDon’t care Important notice! Please don’t stop feeding FS and BCLK. Both FS and BCLK is used as the internal reference clock. LSI does not work when the FS and BCLK are not provided. When stop the BCLK and FS, please set RSTN=“L”. 15 2005/8 ASAHI KASEI [AK2301A] MUTE

The output of the PCM CODEC can be muted by pin control.

MUTEN pin

MUTEN pin

0 1

Operation Mute Normal

DX pin High-Impedance PCM data output

VR pin CODEC analog

ground CODEC analog output

[DX pin]

When the MUTEN pin turns to “L” during the data output, the mute function becomes available at the top of the next FS.

[VR pin]

When the MUTEN pin turns to “L”, 0 code is fed to the D/A converter and VR becomes at analog ground level.

16 2005/8

ASAHI KASEI [AK2301A] Reset and Start up sequence Reset operation starts by low input. This function is used for the initialization at the power up. Please use MUTEN together with RSTN to avoid the popping sound from the output until the AK2301A moves into the stable operation. - Start up sequence (1) After the power on, please set the RSTN pin to low level for 10msec or more. (2) Before the first sequence or less than 250µs after the cancellation of reset, please provide the FS and the BCLK. (3) Please set the MUTEN pin to low level during the period of the AK2301A’s initialization which is less than 200msec after the FS and the BCLK provided. The CODEC voice path is established by releasing the mute function. Less than 250usec10msec or more200msec or moreVDDRSTNFSBCLKMUTEN 0.9VDD(1)(2)(3) 17 2005/8 ASAHI KASEI [AK2301A] Universal op-amps The op-amps for construction of the external filter. The AMP1(2)I is negative input and the AMP1(2)O is output of the op-amp. - Circuit example Please design output load may become 8kΩ or more. The output load includes a feedback register and AC load. These op-amps are assumed to be used for 20kHz max cut off frequency LPF. And please design the gain may become –12~+6dB. The following figure shows the circuit example. C1R1AMP1(2)IC2C3R2AMP1(2)OLoad ZEach parameter is calculated as is shown below. LPFcut-off frequency fCL[Hz] : fCL=1/(2πR2C2) Output load L[Ω] : L=R2Z/(R2+Z) Gain A[dB] : A=20log(R2/R1) HPF cut-off frequency fCH[Hz] : fCH=1/(2πR1C1) 18 2005/8 ASAHI KASEI [AK2301A] APPLICATION CIRCUIT EXAMPLES Analog input circuitGST20kohm1uF10kohm10kohm20kohm100pFAnalog output circuit1uFVRVFTNVFTP100pF10kohmload1uF40kohmVFR100pF1uF40kohmTAGND1uF1uFGSR10kohmloadVSSUniversal op-amps1uF20kohm40kohm1uFPower supply, PLL loop filtercapacitor and analog groundstabilization capacitorVREF1uFAMP1I200pFVREFAMP1OVSS10kohmloadPLLC0.33uF1uF20kohm40kohm1uFPLLAMP2I200pFVSSVDDAMP2O10uF0.1uF10kohmloadVSS 19 2005/8 ASAHI KASEI [AK2301A] IMPORTANT NOTICE l 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. l AKM assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. l 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. l 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. l 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. 20 2005/8