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data bulletin mx029 dual digitally controlled amplifier 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. preliminary information features applications 2 digitally controlled amplifiers 48db gain/attenuation in 2db steps + mute individual control with a 14-bit serial word separate fixed gain buffer amplifier cellular and lmr radios pabxs, electronic mail, tam's automatic test equipment remote gain adjustments digitally set audio control levels load/latch data input serial clock serial interface d g d g ch1, output 1 stage 1 control register stage 1 control register to stage 1 control register ch1, output 2 ch2, output 1 ch2, input 2 ch2, input 1 ch1, input 3 ch1, input 2 ch1, input 1 bias bias bias bias bias v ss v ss v ss v ss v dd universal amp out universal amp in the mx029 digitally controlled amplifier array replaces audio level controls in radio and wireline communications applications. it is a single-chip lsi circuit comprised of two discrete, digitally controlled gain sections. each section has 48 distinct gain steps (+/-48db of range in 2db steps) plus mute. as shown in figure 1, both gain stages have switchable inputs. this switching allows for selection of three different input signals on one channel and two on the other channel. one of the channels also has output switching. in addition to two digitally controlled gain stages, there is a general purpose inverting amplifier. the gain of this amplifier is controlled externally via negative feedback. control of each gain control section is accomplished through the serial interface. all switching is accomplished using controlled rise and fall times, thereby assuring no transients (clicks or pops). the mx029 requires a single 5-volt supply and is available in the following packages: 16-pin soic (mx029dw), 16-pin cdip (MX029J), and 24-pin tssop (mx029tn).
dual digitally controlled amplifier 2 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. contents section page 1. block diagram ............................................................................................................... .. 3 2. signal list ................................................................................................................. ....... 4 3. external components ..................................................................................................... 5 4. application................................................................................................................. ...... 5 4.1 recommendations ............................................................................................................ ..... 5 5. control data and timing................................................................................................. 6 6. performance specification ............................................................................................. 8 6.1 electrical performance ..................................................................................................... ...... 8 6.1.1 absolute maximum ratings ................................................................................................. ......... 8 6.1.2 operating limits......................................................................................................... ................... 8 6.1.3 operating characteristics ................................................................................................ ............. 9 6.2 serial interface timing .................................................................................................... ..... 10 6.3 packaging.................................................................................................................. ........... 11 mx-com, inc. reserves the right to change specifications at any time and without notice.
dual digitally controlled amplifier 3 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. 1. block diagram load/latch data input serial clock serial interface d g d g ch1, output 1 stage 1 control register stage 1 control register to stage 1 control register ch1, output 2 ch2, output 1 ch2, input 2 ch2, input 1 ch1, input 3 ch1, input 2 ch1, input 1 bias bias bias bias bias v ss v ss v ss v ss v dd universal amp out universal amp in figure 1: device block diagram
dual digitally controlled amplifier 4 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. 2. signal list pin no. type description j, dw tn 1 1 serial clock this external clock input is used to clock in the control data. see figure 4 for timing information. this input has an internal 1m pullup resistor. 2 4 control (data) input: operation of the two amplifier channels (ch1 - ch2) is controlled by the data entered serially at this pin. the data is entered (bit 13 to bit 0) on the rising edge of the external serial clock. the data format is described in tables 1-5 and figure 3. this input has an internal 1m pullup resistor. 35 load/ latch this function governs the loading and execution of the control data. during serial data loading this input should be kept at a logical 1 to ensure that data rippling past the latches has no effect. when all 14 bits have been loaded this input should be strobed 1 - 0 -1 to latch the new data in. data is executed on the rising edge of the strobe. 4 6 ch 1 input 1 analog input. 5 7 ch 1 input 2 analog input. 6 8 ch 2 input 1 analog input. 7 9 ch 2 input 2 analog input. 812 v ss negative supply (gnd). 913 v bias the output of the on-chip bias circuitry, held at v dd /2. 10 16 ch 1 input 3 analog input. normally used for fsk data. 11 17 ch 2 output analog output. 12 18 ch 1 output analog output. 13 20 ch 1 output analog output. 14 21 universal amp out output from general purpose amplifier. 15 23 universal amp in inverting input to general purpose amplifier. 16 24 v dd positive supply rail. a single +5-volt power supply is required. 2, 3, 10, 11,14, 15, 19, 22 n/c no internal connection
dual digitally controlled amplifier 5 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. 3. external components c6 v dd 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 serial clock input load/latch ch 1 input 1 ch 1 input 2 ch 2 input 1 ch 2 input 2 c5 v bias v ss c1 c2 c3 c4 serial control data input universal amp in ch 1 output 2 ch 2 output ch 1 input 3 mx029 ch 1 output 1 universal amp out v dd c1 to c5 note 1 0.1f 20% c6 1.0f 20% notes: 1. analog input capacitors c1 to c5 are only required for a.c. input signals; d.c. input signals do not require these components. figure 2: recommended external components 4. application 4.1 recommendations to avoid noise and instability the following practices are recommended: 1. use a clean, well-regulated power supply. 2. keep leads short. 3. inputs and outputs should be shielded wherever possible. 4. analog tracks should not run parallel to digital tracks. 5. a ground plane connected to vss will assist in eliminating external pick-up on the channel input and output pins. 6. avoid running high level outputs adjacent to low level inputs.
dual digitally controlled amplifier 6 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. 5. control data and timing the gain and i/o signal path for each section (channels 1 and 2) is set individually by a 14-bit data word (d0 to d13). data is loaded on the rising edge of the serial clock. loaded data is executed on the rising edge of the load/latch pulse. the 14-bit word consists of 1 channel address bit (d7) for selection of the channel to be programmed, 6 bits for setting the gain/attenuation level (d8-d13), 3 bits for input selection (d4 and d6), and 4 bits for output settings (d0-d3). this format is illustrated in figure 3. d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 g set g set g set g set g set g set chan addr in sel in sel in sel out set out set out set out set gain/attn level channel address input select output settings figure 3: data word format tables 1-5 show how the data word is used to control channel selection, gain/attenuation, input selection and output settings, respectively. to calculate the data word used to control channel gain/attenuation use the following formula: 25 + gain db 2 = the decimal equivalent of binary data word
for example: using a gain of +34db, 25 + +34db 2 =42=$2a= d13 - d8 101010
d13 d12 d11 d10 d9 d8 gain set (db) 000000 mute 000001 -48 000010 -46 000011 -44 011001 0 101110 +42 101111 +44 110000 +46 110001 +48 110010 +48 110011 +48 table 1: gain/attenuation level
dual digitally controlled amplifier 7 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. d7 channel selected 01 12 table 2: channel selection d6 d5 d4 inputs selected 0 0 0 none 001 1 010 2 011 1 & 2 100 3 101 1 & 3 110 2 & 3 1 1 1 1, 2, & 3 table 3: input select d3 d2 output 2 settings 0 0 high impedance 0 1 amplifier output 10 v ss 11 v bias table 4: settings for output 2 (ch 1 only) d1 d0 output 1 settings 0 0 high impedance 0 1 amplifier output 10 v ss 11 v bias table 5: settings for output 1
dual digitally controlled amplifier 8 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. 6. performance specification 6.1 electrical performance 6.1.1 absolute maximum ratings exceeding these maximum ratings can result in damage to the device. general min. max. units supply (v dd -v ss ) -0.3 7.0 v voltage on any pin to v ss -0.3 (v dd + 0.3) v current v dd -30 30 ma v ss -30 30 any other pin -20 20 ma total allowable power dissipation at t amb 25c 800 mw max. derating above t amb 25c 10 mw/c above t amb 25c operating temperature -40 85 c storage temperature -55 125 c 6.1.2 operating limits correct operation of the device outside these limits is not implied. min. typ. max. units v dd 4.5 5.0 5.5 v operating temperature -40 85 c
dual digitally controlled amplifier 9 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. 6.1.3 operating characteristics for the following conditions unless otherwise specified: v dd = 5.0v, t amb = 25c audio level 0db ref. = 775mv rms notes min. typ. max units current: all stages operating 3.0 ma digital inputs input logic 1 3.5 v input logic 0 1.5 v digital input impedance 0.5 1.0 m gain control amplifier stages bandwidth (-3db) 1 3.3 khz output impedance 1.0 2.0 k total harmonic distortion 2, 4 0.35 0.5 % interstage isolation 60.0 db gain/attenuation 46 48 db gain/attenuation steps (48 total) 2.0 db step error 0.4 db input impedance 50.0 k input referred offset voltage (v ios )10mv universal amplifier bandwidth (-3db) 3 10 khz output impedance 1.0 2.0 k total harmonic distortion 3 0.35 0.5 % open loop dc gain 60 db notes: 1. gain set to maximum (+48 db) 2. gain set 0db. input level 1khz -3.0db (549mv rms ) 3. gain externally set to 10 db. 4. with a 100k load on the output.
dual digitally controlled amplifier 10 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. 6.2 serial interface timing parameter min. typ. max. units t pwh serial clock high pulse width 250 ns t pwl serial clock low pulse width 250 ns t ds data set-up time 150 ns t dh data hold time 50 ns t llo load/latch over time 0 ns t lld load/latch delay 200 ns t llw load/latch pulse width 150 ns serial data clock frequency 2.0 mhz serial clock serial data load/latch t t t t t pwl pwh ds llw dh d0 1st clock pulse 14th clock pulse d13 d12 d1 t lld t llo figure 4: serial timing diagram
dual digitally controlled amplifier 11 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. 6.3 packaging pin 1 a b alternative pin location marking e l t p j y c h 0.303 (7.70) package tolerances typ. max. min. a b c e h dim. j p y t l 0.047 (1.20) ---------- 0.256 (6.50) 0 8 0.030 (0.75) 0.311 (7.90) 0.177 (4.50) 0.0256 (0.65) 0.020 (0.50) 0.248 (6.30) 0.006 (0.15) 0.002 (0.05) 0.003 (0.08) 0.008 (0.20) 0.007 (0.17) 0.012 (0.30) 0.169 (4.30) note : all dimensions in inches (mm.) angles are in degrees figure 5: 24-pin tssop mechanical outline: order as part no. mx029tn pin 1 a b alternative pin location marking x p j y c k h e l t w z note : all dimensions in inches (mm.) angles are in degrees package tolerances a b c e h typ. max. min. dim. j p x w t y k l 0.105 (2.67) 0.093 (2.36) 0.419 (10.64) 45 7 0 10 0.050 (1.27) 0.041 (1.04) 0.413 (10.49) 0.299 (7.59) 0.050 (1.27) 0.016 (0.41) 0.390 (9.90) 0.020 (0.51) 0.003 (0.08) 0.009 (0.23) 0.0125 (0.32) 0.013 (0.33) 0.020 (0.51) 0.395 (10.03) 0.286 (7.26) z 5 5 figure 6: 16-pin soic mechanical outline: order as part no. mx029dw
dual digitally controlled amplifier 12 mx029 1998 mx-com, inc. www. mxcom.com tele: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20480096.008 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. b a pin 1 e1 t e k h f j1 j p l c k1 package tolerances note : all dimensions in inches (mm.) angles are in degrees typ. max. min. a b c e e1 f h dim. j j1 p t k1 k l 0.230 (5.84) 0.291 (7.39) 0.415 (10.53) 0.200 (5.08) 0.767 (19.48) 0.165 (4.19) 0.100 (2.54) 0.115 (2.92) 0.370 (9.40) 0.300 (7.61) 0.317 (8.04) 0.70 (17.78) 0.018 (0.46) 0.053 (1.33) 0.075 (1.91) 0.080 (2.03) 0.080 (2.03) 0.753 (19.13) 0.285 (7.24) 0.0102 (0.259) 0.020 (0.51) 0.055 (1.39) 0.0098 (0.249) figure 7: 16-pin cdip mechanical outline: order as part no. MX029J

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