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[AK2331] ms0903-e-00 2008/03 - 1 - AK2331 dac type 8-bit 4-channel electronic volume features ? 8-bit 4 channels of built-in mu ltiplication d/a converters ? support for external one-path, internal three-path d/a converter reference voltages ? built-in buffer amplifier with low distor tion (-60db typ.) and rail-to-rail operation ? support for 3v control and 5v operation bec ause of the three-wire serial system with separate power supplies ? operating voltage r ange: 2.6 to 5.5v ? operating temperatur e range: -40 to +85 c ? package 16-pin qfnj (3.0mm x 3.0 mm x 0.70mm, 0.5-mm pitch) overview the AK2331 is an electronic volume into which 8 bit 4 channels of multiplication d/a converters are integrated on a single chip. the reference voltage of the d/a converter can be selected from one external path (vref pin level) and internal three paths (vss, avdd, avdd/2) for each channel and it can be used as a normal d/a converter or an electronic volume that attenuates signals from input pins vin0 to vin3. a buffer amplifier is incorporated as the subsequent stage of the d/a converter, which provides rail-to-rail output and a signal with a distortion of -60db. in operational setting, the three-wire serial system, which synchronizes serial input (sdata) consisting of a 4-bit address and 8-bit data with the csn and sclk signals, is adopted, a power supply (dvdd) is provided separately from the d/a converter, and 3v serial control and 5v d/a converter operation are enabled. in addition, settings can be made so that the avdd/2 level, which was generated internally, is output to vout0 to vo ut3 pins through the buffer amplifier by bypassing the d/a converter or the buffer amplifier is powered down. a 16-pin small and low-profile qfnj package (3.0mm square x 0.70mm height) is employed to achieve high-density packaging.
[AK2331] ms0903-e-00 2008/03 - 2 - contents features......................................................................................................... 1 overview ........................................................................................................ 1 contents......................................................................................................... 2 block diagram................................................................................................ 3 pin assignments ............................................................................................ 3 block functions.............................................................................................. 4 pin functions ................................................................................................. 5 absolute maximum ratings ........................................................................... 6 recommended operating conditions ............................................................ 6 current consumption..................................................................................... 6 digital dc characteristics .............................................................................. 7 system reset................................................................................................. 7 analog characteristics ................................................................................... 8 digital ac timing ......................................................................................... 11 register functions ....................................................................................... 12 recommended external circuit examples................................................... 15 package ....................................................................................................... 16 important notice........................................................................................... 17
[AK2331] ms0903-e-00 2008/03 - 3 - block diagram pin assignments pin assignments (top view) channel & address decoder 8 8-bit latch0 8 vref 8-bit dac0 vout0 ? + vin0 csn sclk sdata rstn dvdd + vss a vdd avdd, avdd/2, vss + 8-bit dac1 vout1 ? + vin1 8-bit dac2 vout2 ? + vin2 8-bit dac3 vout3 ? + vin3 8 8 8 8-bit latch1 8-bit latch2 8-bit latch3 control register vout0 vin0 rstn vin2 3 2 6 14 csn 7 vin1 5 vout1 4 vin3 1 sclk 8sdata 9 dvdd 10 vref 13 a vdd 12 vss 11 vout3 16 vout2 15
[AK2331] ms0903-e-00 2008/03 - 4 - block functions block function control register the control register inputs serial data (sdata) consisting of a 4-bit address and 8-bit data in sync with the csn and sclk signals to set register data. when a system reset is performed through the rstn pin on power-up, all registers are initialized. the same reset (soft rese t) can also be made by the srst register (refer to register descriptions). channel & address decoder the channel & address decoder decodes the dat a set by the control register and sets the corresponding d/a conv erter and reference voltage. 8-bit latch0 to latch3 the 8-bit latch0 to latch3 store the r egister data of the control register. 8-bit dac0 to dac3 the 8-bit dac0 to dac3 are 8-bit d/a c onverters set by the data latched in the previous stage. buffer the buffer is a buffer amplifie r that performs rail-to-rail operation.
[AK2331] ms0903-e-00 2008/03 - 5 - pin functions pin no. pin name pin type pin status at system reset function 5 rstn di z reset pin 6 csn di z chip select input pin for serial interface data 7 sclk di z clock input pi n for serial interface data 8 sdata di z i/o pin for serial interface data 9 dvdd pwr - digital vdd power supply pin connect this pin to a 2.6 to 5.5v power supply. connect a bypass capacitor of 0.1 f or greater between this pin and the vss pin. 10 vss pwr - vss power supply pin always apply a voltage of 0v to this pin. 11 avdd pwr - analog vdd power supply pin connect this pin to a 2.6 to 5.5v power supply. connect a bypass capacitor of 0.1 f or greater between this pin and the vss pin. apply a voltage so that dvdd is equal to or less than avdd. 12 vref ai z d/a converter reference voltage input pin 1 vin0 ai l 4 vin1 ai l 13 vin2 ai l 16 vin3 ai l d/a converter input pin 2 vout0 ao z 3 vout1 ao z 14 vout2 ao z 15 vout3 ao z d/a converter/buffer amplifier output pin note a : analog, d : digital, pwr : power, i : input, o : output, z : high-z, l : low
[AK2331] ms0903-e-00 2008/03 - 6 - absolute maximum ratings parameter symbol min. max. unit avdd -0.3 6.5 v power supply voltage dvdd -0.3 6.5 v ground level vss 0 0 v input voltage v in -0.3 avdd+0.3 dvdd+0.3 v input current (excl uding power pins) i in -10 +10 ma storage temperature t stg -55 130 c note all voltages are relative to the vss pin. caution if the device is used in conditions exceeding these val ues, the device may be destroyed. normal operation is not guarante ed in such extreme conditions. recommended operating conditions parameter symbol condition min. typ. max. unit operating temperature ta -40 +85 c avdd 2.6 5.0 5.5 v operating power supply voltage dvdd dvdd avdd 2.6 5.0 5.5 v analog output load capacity aoc 100 pf note all voltages are relative to the vss pin. current consumption parameter symbol condition min. typ. max. unit sidd dvdd = avdd = 5v vin = avdd, daref:vss (on a system reset) 1 20 a idd1 dvdd = avdd = 5v vin = avdd, daref:vss vout[7:0] = 0x80 0.6 1.2 ma current consumption idd2 dvdd = avdd = 5v vin = avdd, daref:avdd/2 vout[7:0] = 0x00 0.75 1.5 ma note dacref shows the internal se tting level of dac reference voltage. current consumpti on does not include vin pins input current and output load current.
[AK2331] ms0903-e-00 2008/03 - 7 - digital dc characteristics parameter symbol condition min. typ. max. unit high level input voltage v ih csn, sclk, sdata, rstn 0.8dvdd v low level input voltage v il csn, sclk, sdata, rstn 0.2dvdd v high level input current i ih v ih = dvdd csn, sclk, sdata, rstn 1 a low level input current i il v il = 0v csn, sclk, sdata, rstn -1 a system reset parameter symbol condition min. typ. max. unit remarks hardware reset signal input width t rstn rstn pin 1 s *1) software reset srst register *2) *1) 35ms or more after power-on, be sure to perform a hardware reset operation (register initialization). when a low pulse is input for 1 s or more, a reset is made. at th is time, set the digital input (di) pins: rstn to high, csn to high, and sclk to low. *2) when the srst[7:0] register is set to 0xaa (10101010), a software reset is made. this setting initializ es all registers. for details, refer to "register functions". rstn v ih v il t rstn
[AK2331] ms0903-e-00 2008/03 - 8 - analog characteristics unless otherwise specified, the following apply: avdd = 4.5 to 5.5v, vss = 0v, avdd vin, vref = 0v to avdd, ta = -40 to +85 c. dacref shows an internal setting le vel of dac reference voltage. parameter symbol condition min. typ. max. unit vref pin leak current i vref vin = avdd = 5v vref = 0v 10 a vref pin input voltage range v vref vin = avdd = 5v 0.2 avdd-0.2 v resolution res 8 bit differential nonlinearity dnl -1 +1 lsb nonlinearity *1) inl vin = avdd = 5v dacref: vss |iao| = 0 a vout = 0x02 to 0xff -1.5 +1.5 lsb |iao| = 0 a vin = avdd, dacref: vss vout[7:0] = 0x00 0.1 v vao1 |iao| = 0 a vin = avdd, dacref:vss vout[7:0] = 0xff avdd-0.1 v |iao| 1ma vin = avdd, dacref: vss vout[7:0] = 0x00 0.4 v buffer amplifier output voltage range vao2 |iao| 1ma vin = avdd, dacref: vss vout[7:0] = 0xff avdd-0.4 v avdd/2 output voltage when avdd2o[7:0] is set vao3 avdd = 5v, |iao| 1ma 2.45 2.5 2.55 v maximum input frequency fin avdd = 5v, dacref: avdd/2 vin = 3vp-p, 10khz vout[7:0] = 0xff rl = 22k ? , cl = 100pf 2.7 3.0 vp-p output distortion sinad avdd = 5v, dacref: avdd/2 vin = 3vp-p, 1khz vout[7:0]=0x0a to 0xff rl = 22k ? , cl = 100pf 30khz lpf used *4) 56 60 db
[AK2331] ms0903-e-00 2008/03 - 9 - parameter symbol condition min. typ. max. unit dac output settling time t ldd1 vout[7:0] = 0x10 ? 0xef until output reaches the half lsb of the final value. rs = 2.2k ? , rl = 22k ? , cl = 1000pf *3) 300 s vin pin input impedance r in 135 k vout pin output impedance r out 20 *1) error between the i/o curve and the ideal line connecting the output voltage for the 02 setting and the output voltage for the ff setting. unless otherwise specified, the following appl y: avdd = 2.6 to 3.3v, vss = 0v, avdd vin, vref = 0v to avdd, ta = -40 c to +85 c dacref shows an internal setting le vel of dac reference voltage. parameter symbol condition min. typ. max. unit resolution res 8 bit differential nonlinearity dnl -1 +1 lsb nonlinearity *2) inl vin = avdd = 3v dacref: vss |iao| = 0 a vout = 0x02 to 0xff -1.5 +1.5 lsb |iao| 600 a vin = avdd, dacref: vss vout[7:0] = 0x00 0.4 v buffer amplifier output voltage range vao4 |iao| 600 a vin = avdd, dacref: vss vout[7:0] = 0xff avdd-0.4 v output distortion distn avdd = 3v, dacref: avdd/2 vin = 1.8vp-p, 1khz vout[7:0]=0x0a to 0xff rl = 22k ? , cl = 100pf 30khz lpf used *4) 45 55 db *2) error between the i/o curve and the ideal line connecting the output voltage for the 02 setting and the output voltage for the ff setting.
[AK2331] ms0903-e-00 2008/03 - 10 - *3) load condition when AK2331 is used as dac (load condition when ?dac output settling time? is measured) *4) load condition when AK2331 is used as attenuator (load condition when ?output distortion? is measured) rl=22k _ + lsi r vout0?3 cl=1000pf rs=2.2k rl=22k _ + lsi r vout0?3 cl=100pf
[AK2331] ms0903-e-00 2008/03 - 11 - digital ac timing serial interface timing the AK2331 writes data via the three-wire synchronous serial interface by means of csn, sclk, and sdata. sdata (serial data) consists of a register address (starting from the msb, a3 to a0) and control data (starting from the msb, d7 to d0). <1> csn (chip select) is normally set to the high level. when csn is set to the low level, the serial interface becomes active. <2> when a write operation is performed, an address and data are input in synchronization with the rising edges of 12 sclk clock pulses while csn is low. <3> a write setting is made on the assumption that 12 clock pulses are input from sclk while csn is low. note that if clock pulses more than or less than 12 clock pulses are input, data cannot be set correctly. rising and falling times parameter symbol condition min. typ. max. unit csn setup time t css 100 ns sdata setup time t ds 100 ns sdata hold time t dh 100 ns sclk high time t wh 500 ns sclk low time t wl 500 ns csn low hold time t cslh 100 ns csn high hold time t cshh 100 ns dac output setting time t ldd vout[7:0]= 0x10 ? 0xef until output reaches the half lsb of the final value. rs=2.2k ? , l=22k ? , cl=1000pf 300 s sclk rising time t r 100 ns sclk falling time t f 100 ns note digital input timing measurements are made at 0.5dvdd for rising and falling edges. csn sclk sdata t css t wh t wl t dh t ds a 3 a 2 a 1 a 0d7d6 d0 d1 t cslh t cshh sclk v il v ih t r t f
[AK2331] ms0903-e-00 2008/03 - 12 - register functions 1) register configuration address data a3 a2 a1 a0 function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 vout0 register vout07 vout06 vout05 vout04 vout03 vout02 vout01 vout00 0 0 0 1 vout1 register vout17 vout16 vout15 vout14 vout13 vout12 vout11 vout10 0 0 1 0 vout2 register vout27 vout26 vout25 vout24 vout23 vout22 vout21 vout20 0 0 1 1 vout3 register vout37 vout36 vout35 vout34 vout33 vout32 vout31 vout30 0 1 0 0 not used ? ? ? ? ? ? ? ? 0 1 0 1 not used ? ? ? ? ? ? ? ? 0 1 1 0 not used ? ? ? ? ? ? ? ? 0 1 1 1 not used ? ? ? ? ? ? ? ? 1 0 0 0 vref register da3ref1 da3ref0 da2ref1 da2ref0 da1ref1 da1ref0 da0ref1 da0ref0 1 0 0 1 not used ? ? ? ? ? ? ? ? 1 0 1 0 avdd/2 register ? ? ? ? avdd2o3 avdd2o2 avdd2o1 avdd2o0 1 0 1 1 bufon register ? ? ? ? bufon3 bufon2 bufon1 bufon0 1 1 0 0 software reset srst[7:0] 1 1 0 1 vout0 to vout3 output control ctrl3 ctrl2 ctrl1 ctrl0 1 1 1 0 not used ? ? ? ? ? ? ? ? 1 1 1 1 not used ? ? ? ? ? ? ? ? note an access to data indicated by "-" d oes not have any effect on the lsi operation. 2) descriptions of registers 2.1) vout register address data a3 a2 a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 vout07 vout06 vout05 vout04 vout03 vout02 vout01 vout00 0 0 1 1 vout37 vout36 vout35 vout34 vout33 vout32 vout31 vout30 initial value 0 0 0 0 0 0 0 0 d7 d6 d5 d4 d3 d2 d1 d0 vout0 to vout3 output 0 0 0 0 0 0 0 0 vout = (vin - vref) ? 0/256 + vref 0 0 0 0 0 0 0 1 vout = (vin - vref) ? 1/256 + vref 0 0 0 0 0 0 1 0 vout = (vin - vref) ? 2/256 + vref 0 0 0 0 0 0 1 1 vout = (vin - vref) ? 3/256 + vref 1 1 1 1 1 1 1 0 vout = (vin - vref) ? 254/256 + vref 1 1 1 1 1 1 1 1 vout = (vin - vref) ? 255/256 + vref
[AK2331] ms0903-e-00 2008/03 - 13 - 2.2) vref registers address data a3 a2 a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 1 0 0 0 da3ref1 da3ref0 da2ref1 da2ref0 da1ref1 da1ref0 da0ref1 da0ref0 initial value 0 0 0 0 0 0 0 0 da3ref1 to da0ref1 da3ref0 to da0ref0 dac reference voltage remarks 0 0 vss (internal) 0 1 avdd (internal) 1 0 avdd/2 (internal) 1 1 vref (external) 2.3) avdd/2 register address data a3 a2 a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 1 0 1 0 avdd2o3 avdd2o2 avdd2o1 avdd2o0 initial value 0 0 0 0 0 0 0 0 function data item 0 1 remarks avdd2o3 to avdd2o0 internal avdd/2 output dac output bypasses the dac and outputs the avdd/2 level through buffer. note internal generated avdd/2 level can be output to vout0 to vout3 pins by setting this register. 2.4) bufon register address data a3 a2 a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 1 0 1 1 bufon3 bufon2 bufon1 bufon0 initial value 0 0 0 0 0 0 0 0 function data item 0 1 remarks bufon3 to bufon0 dac buffer operation powers down buffer and outputs hi-z. buffer output 2.5) software reset register address data a3 a2 a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 1 1 0 0 srst[7:0] initial value 0 0 0 0 0 0 0 0 when the srst[7:0] register is set to 0x aa (10101010), a software reset is performed. this setting initializ es all registers. upon completion of a software rese t, the register is set to 0.
[AK2331] ms0903-e-00 2008/03 - 14 - 2.6) vout0 vout3 control register address data a3 a2 a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 1 1 0 1 ? ? ? ? ctrl3 ctrl2 ctrl1 ctrl0 initial value ? ? ? ? 0 0 0 0 function data item 0 1 remarks ctrl3 to ctrl 0 vout0 to vout3 output control vout 7:0 data is output vout 7:0 data is held latch-timing of each dac data can be matched by the ctrl register setting. after vout[7:0] is set, when ctrl register is set to ?0?, vout[7:0] data is reflected in the dac output immediately. when ctrl register is set to ?1?, dac output will not be affected regardless of changes made in vout[7:0] data. in this case vout[7:0] data output by da c will remain the same as that of data when setting ctrl register to ?1?. the data will be reflect ed in the dac output when t he timing is set to ?0?.
[AK2331] ms0903-e-00 2008/03 - 15 - recommended external circuit examples 1) power supply stab ilizing capacitors connect capacitors between the vdd and vss pins to eliminate ripple and noise included in the power supply as shown below. for maximum effect, the capacitors should be placed at a shortest distance between the pins. 2) external vin0 to vin3 capacitor when inputting an analog signal to the vin pin, connect a capacitor to adjust the dc offset of the input signal and the internal operation point in the lsi dev ice. this forms a high-pass filter with fc being about 130hz. lsi c vin0 to vin3 c = 0.01 f lsi c2 dvdd vss c1 c2 = 4.7 f (electrolytic cap) c1 = 0.1 f (ceramic cap) avdd
[AK2331] ms0903-e-00 2008/03 - 16 - package 1) marking part number 2331 date code x: least significant digit of the year of production y: week of production z: identification code of production lot k: consignment code 2) external dimensions package type: 16-pin qfnj (3.0mm x 3.0mm x 0.70mm, 0.5-mm pitch) note the exposed pad at the center of the back of the package must be connected to vss or opened. 2331 xyyzk 3.000.10 3.000.10 a 9 13 16 1 5 8 12 0.75max co.3 1.50 1.80 1.80 1.50 s 0.50 0.05max 4 b s a b 0.10 1.500.05 1.500.05 0.300.07 0.220.05 0.75 0.05 s a b m 0.70 s 0.05 0.00 0.05 0.17 0.27 0.12 0.23 detail figure of a a
[AK2331] ms0903-e-00 2008/03 - 17 - important notice important notice z these products and their specifications are subject to change without notice. when you consider any use or application of these products, please make inquiries the sales office of asahi kasei emd corporation (akemd) or authorized distributors as to current status of the products. z akemd assumes no liability fo r infringement of any pate nt, intellect ual property, or other rights in the application or us e of any information contained herein. z 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. z akemd products are neithe r intended nor authorized for use as critical components note1) in any safety, life support, or other hazard related device or system note2) , and akemd assumes no responsibility for such use, except for the use approved with the express written consent by representative director of akemd. as used here: note1) 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 devic e or system containing it, and which must therefore meet very high standards of performance and reliability. note2) 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. z it is the responsibility of the buye r or distributor of akemd products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume an y and all responsibility and liability for and hold akemd harmless from any and all claims arising from the use of said product in the absence of such notification.

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