1 ltc7543/ltc8143 improved industry standard serial 12-bit multiplying dacs n improved direct replacement for ad7543 and dac-8143 n low cost n dnl and inl over temperature: 0.5lsb n easy, fast and flexible serial interface n daisy-chain 3-wire interface for multiple dac systems (ltc8143) n 1lsb maximum gain error over temperature eliminates adjustment n asynchronous clear input for initialization n four-quadrant multiplication n low power consumption n 16-pin pdip and so packages the ltc ? 7543/ltc8143 are serial-input 12-bit multiply- ing digital-to-analog converters (dacs). they are superior pin compatible replacements for the ad7543 and dac-8143. improvements include better accuracy, better stability over temperature and supply variations, lower sensitivity to output amplifier offset, tighter timing speci- fications and lower output capacitance. an easy-to-use serial interface includes an asynchronous clear input for systems requiring initialization to a known state. the ltc8143 has a serial data output to allow daisy- chaining multiple dacs on a 3-wire interface bus. these dacs are extremely versatile. they can be used for 2-quadrant and 4-quadrant multiplying, programmable gain and single supply applications, such as noninverting voltage output and biased or offset ground mode. parts are available in 16-pin pdip and so packages and are specified over the extended industrial temperature range, C 40 c to 85 c. features descriptio n u n process control and industrial automation n remote microprocessor-controlled systems n digitally controlled filters and power supplies n programmable gain amplifiers n automatic test equipment applicatio n s u , ltc and lt are registered trademarks of linear technology corporation. typical applicatio n u multiplying dac has easy 3-wire serial interface v dd v ref ltc7543
ltc8143 r fb agnd dgnd 3 12 4 7 5 2 14 5v v in clock data load stb1 sri ld1 15 16 1 out 1 33pf v out 7543/8143 ta01 out 2 + lt 1097 integral nonlinearity over temperature digital input code 0 integral nonlinearity (lsb) 4095 7543/8143 ta02 1024 2048 3072 1.0
0.5
0
0.5
1.0 512 1536 2560 3584 t a = 85 c t a = 25 c t a = 40 c
2 ltc7543/ltc8143 absolute m axi m u m ratings w ww u package/order i n for m atio n w u u v dd to agnd .............................................. C 0.5v to 7v v dd to dgnd .............................................. C 0.5v to 7v agnd to dgnd ............................................ v dd + 0.5v dgnd to agnd ............................................ v dd + 0.5v digital inputs to dgnd ............... C 0.5v to (v dd + 0.5v) v out1 , v out2 to agnd ................. C 0.5v to (v dd + 0.5v) v ref to agnd, dgnd ............................................ 25v v rfb to agnd, dgnd ........................................... 25v maximum junction temperature .......................... 150 c operating temperature range ............... C 40 c to 85 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c ltc7543gkn ltc7543kn ltc7543gksw ltc7543ksw ltc8143en ltc8143fn ltc8143esw ltc8143fsw order part number consult factory for military grade parts. t jmax = 150 c, q ja = 100 c/ w (n) t jmax = 150 c, q ja = 130 c/ w (sw) v dd = 5v, v ref = 10v, v out1 = v out2 = agnd = dgnd =0v, t a = t min to t max , unless otherwise specified. accuracy characteristics C ltc7543gk ltc7543k symbol parameter conditions min typ max min typ max units resolution l 12 12 bits inl integral nonlinearity (note 1) l 0.5 0.5 lsb (relative accuracy) dnl differential nonlinearity guaranteed monotonic, t min to t max l 0.5 0.5 lsb ge gain error (note 2) t a = 25 c 1 2 lsb t min to t max l 1 2 lsb gain temperature coefficient (note 3) l 15 15ppm/ c ( d gain/ d temp) i lkg output leakage current (note 4) t a = 25 c 1 1na t min to t max l 10 10 na zero-scale error t a = 25 c 0.006 0.006 lsb t min to t max l 0.06 0.06 lsb psrr power supply rejection ratio v dd = 5v 5% l 0.0001 0.002 0.0001 0.002 %/% 1
2
3
4
5
6
7
8
top view sw package
16-lead plastic so wide n package
16-lead pdip 16
15
14
13
12
11
10
9
out 1
out 2
agnd
stb1
ld1
sri
stb2 r fb
v ref
v dd
clr
dgnd
stb4
stb3
ld2 nc (ltc7543)
sro (ltc8143) ltc7543
3 ltc7543/ltc8143 v dd = 5v, v ref = 10v, v out1 = v out2 = agnd = dgnd = 0v, t a = t min to t max , unless otherwise specified. ltc8143e ltc8143f symbol parameter conditions min typ max min typ max units resolution l 12 12 bits inl integral nonlinearity (note 1) l 0.5 1 lsb (relative accuracy) dnl differential nonlinearity guaranteed monotonic, t min to t max l 0.5 1 lsb ge gain error (note 2) t a = 25 c 1 2 lsb t min to t max l 2 2 lsb gain temperature coefficient (note 3) l 15 15ppm/ c ( d gain/ d temp) i lkg output leakage current (note 4) t a = 25 c 5 5na t min to t max l 25 25 na zero-scale error t a = 25 c 0.03 0.03 lsb t min to t max l 0.15 0.15 lsb psrr power supply rejection ratio v dd = 5v 5% l 0.0001 0.002 0.0001 0.002 %/% accuracy characteristics C ltc8143 v dd = 5v, v ref = 10v, v out1 = v out2 = agnd = dgnd = 0v, t a = t min to t max , unless otherwise specified. electrical characteristics C ltc7543/ltc8143 ltc7543/ltc8143 all grades symbol parameter conditions min typ max units reference input r ref v ref input resistance (note 5) l 81115 k w ac performance (note 3) output current settling time (notes 6, 7) l 0.25 1 m s multiplying feedthrough error v ref = 10v, 10khz sinewave l 0.8 2 mv p-p digital-to-analog glitch energy (notes 6, 8) l 2 20 nv-sec thd total harmonic distortion (note 9) l C 108 C 92 db output noise voltage density (note 10) l 13 nv/ ? hz analog outputs (note 3) c out output capacitance dac register loaded to all 1s c out1 l 60 90 pf c out2 l 20 60 pf dac register loaded to all 0s c out1 l 30 60 pf c out2 l 50 90 pf digital inputs v ih digital input high voltage l 2.4 v v il digital input low voltage l 0.8 v i in digital input current v in = 0v to v dd l 0.001 1 m a c in digital input capacitance (note 3), v in = 0v l 8pf digital outputs: sro (ltc8143 only) v oh digital output high i oh = C 200 m a l 4v v ol digital output low i ol = 1.6ma l 0.4 v
4 ltc7543/ltc8143 v dd = 5v, v ref = 10v, v out1 = v out2 = agnd = dgnd = 0v, t a = t min to t max , unless otherwise specified. electrical characteristics C ltc7543/ltc8143 the l denotes specifications which apply over the full operating temperature range. note 1: 0.5lsb = 0.012% of full scale. note 2: using internal feedback resistor. note 3: guaranteed by design, not subject to test. note 4: i out1 with dac register loaded with all 0s or i out2 with dac register loaded with all 1s. note 5: typical temperature coefficient is 100ppm/ c. note 6: out 1 load = 100 w in parallel with 13pf. note 7: to 0.01% for a full-scale change, measured from falling edge of ld1 or ld2. note 8: v ref = 0v. dac register contents changed from all 0s to all 1s or from all 1s to all 0s. note 9: v ref = 6v rms at 1khz. dac register loaded with all 1s. note 10: calculation from e n = ? 4ktrb where: k = boltzmann constant (j/k ); r = resistance ( w ); t = resistor temperature ( k); b = bandwidth (hz). note 11: minimum high time for stb1, stb2, stb4. minimum low time for stb3. note 12. minimum low time for stb1, stb2, stb4. minimum high time for stb3. ltc7543/ltc8143 all grades symbol parameter conditions min typ max units timing characteristics (note 3) t ds1 serial input to strobe setup time stb1 used as the strobe l 50 5 ns t ds2 stb2 used as the strobe l 20 C 5 ns t ds3 stb3 used as the strobe l 0C30 ns t ds4 stb4 used as the strobe l 0C30 ns t dh1 serial input to strobe hold time stb1 used as the strobe l 30 10 ns t dh2 stb2 used as the strobe l 50 25 ns t dh3 stb3 used as the strobe l 80 55 ns t dh4 stb4 used as the strobe l 80 55 ns t sri serial input data pulse width l 80 ns t stb1 , t stb2 , strobe pulse width (note 11) l 80 ns t stb3 , t stb4 t stb1 , t stb2 , strobe pulse width (note 12) l 80 ns t stb3 , t stb4 t ld1 , t ld2 load pulse width l 140 ns t asb lsb strobed into input register l 0ns to load dac register time t clr clear pulse width l 80 ns sro timing characteristics (ltc8143 only) t pd stb2, stb3, stb4 strobe to sro c l = 50pf l 220 120 ns propagation delay t pd1 stb1 to sro propagation delay c l = 50pf l 150 80 ns power supply v dd supply voltage l 4.75 5 5.25 v i dd supply current digital inputs = 0v or v dd l 0.1 ma digital inputs = v ih or v il l 2ma (t stb = 80ns) (t stb = 80ns)
5 ltc7543/ltc8143 40k 10k 40k 20k 40k 20k 40k 20k 40k 40k 40k decoder bit 1
(msb) bit 2 bit 3 bit 4 bit 12
(lsb) clr clk out sro ltc8143 only in load dgnd v dd v ref r fb out 1 out 2 sri 7 agnd 3 2 1 16
7543/8143 bd dac register input 12-bit shift register 9 8 10 12 11 4 6 5 13 14 15 stb1
stb2
stb3
stb4 ld1 clr ld2 block diagra m w ti i g diagra u w
w sri sro
(ltc8143 only) ld1, ld2 previous
word bit 1
msb bit 1 (msb)
previous word bit 1 (msb)
current word bit 2 bit 2 bit 3 bit 11 7543/8143 td01 bit 12
lsb bit 12
lsb t ds1
t ds2
t ds3
t ds4 t dh1
t dh2
t dh3
t dh4 t pd
t pd1 t stb1
t stb2
t stb3
t stb4 t sri t asb t stb1
t stb2
t stb3
t stb4 t ld1
t ld2
strobe input
stb1, stb2, stb4
(invert for stb3)
6 ltc7543/ltc8143 truth tables table 1. ltc7543/ltc8143 input register control inputs input register operation stb1 stb2 stb3 stb4 (ltc8143: sro operation) 0 1 0 serial data bit on sri loaded into input 0 1 0 register, msb first 0 0 0 (ltc8143: data bit or sri appears on 0 0 1 sro pin after 12 clocked bits) 1 x x x no input register operation x 1 x x (ltc8143: no sro operation) xx0x xxx1 table 2. ltc7543/ltc8143 dac register control inputs clr ld1 ld2 dac register operation 0 x x reset dac register to all 0s (asynchronous operation; no effect on input register) 1 1 x no dac register operation 1x1 1 0 0 load dac register with the contents of input register typical applicatio n s u v dd v ref ltc7543
ltc8143 r fb agnd dgnd 3 12 10
4
7
5
6
9
8
11 2 14 13 5v v ref
?0v to 10v to next dac
for daisy-chaining
(ltc8143) 15 16 1 out 1 33pf 0.1 m f v out
0v to v ref 7543/8143 ta03 out 2 + lt1097 clr stb3
stb1
sri
ld1
sro (ltc8143)
ld2
stb2
stb4 m p unipolar operation (2-quadrant multiplication) digital input binary number in analog output dac register v out msb lsb 1111 1111 1111 C v ref (4095/4096) 1000 0000 0000 C v ref (2048/4096) = C v ref /2 0000 0000 0001 C v ref (1/4096) 0000 0000 0000 0v unipolar binary code table
7 ltc7543/ltc8143 typical applicatio n s u v dd v ref ltc7543
ltc8143 r fb r1
10k r3
20k r2
20k agnd dgnd 3 12 2 14 5v v ref
?0v to 10v 15 16 1 out 1 0.1 m f (logic inputs
omitted for
clarity) v out 7543/8143 ta04 out 2 + 1/2
lt1112 33pf + 1/2
lt 1112 bipolar operation (4-quadrant multiplication) digital input binary number in analog output dac register v out msb lsb 1111 1111 1111 v ref (2047/2048) 1000 0000 0001 v ref (1/2048) 1000 0000 0000 0v 0111 1111 1111 C v ref (1/2048) 0000 0000 0000 C v ref (2048/2048) = C v ref bipolar offset binary code table information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
8 ltc7543/ltc8143 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7487 (408) 432-1900 l fax : (408) 434-0507 l telex : 499-3977 lt/gp 0695 10k ? printed in usa ? linear technology corporation 1995 package descriptio n u dimension in inches (millimeters) unless otherwise noted. n package 16-lead plastic dip n16 0694 0.255 0.015*
(6.477 0.381) 0.770*
(19.558)
max 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.015
(0.381)
min 0.125
(3.175)
min 0.130 0.005
(3.302 0.127) 0.065
(1.651)
typ 0.045 ?0.065
(1.143 ?1.651) 0.018 0.003
(0.457 0.076) 0.045 0.015
(1.143 0.381) 0.100 0.010
(2.540 0.254) 0.009 ?0.015
(0.229 ?0.381) 0.300 ?0.325
(7.620 ?8.255) 0.325 +0.025
0.015 +0.635
0.381 8.255 () *these dimensions do not include mold flash or protrusions.
mold flash or protursions shall not exceed 0.010 inch (0.254mm). s package 16-lead plastic sol sol16 0392 note:
1. pin 1 ident, notch on top and cavities on the bottom of packages are the manufacturing options.
the part may be supplied with or without any of the options. note 1 0.398 ?0.413
(10.109 ?10.490)
(note 2) 16 15 14 13 12 11 10 9 1 23 4 5 6 78 0.394 ?0.419
(10.007 ?10.643) 0.037 ?0.045
(0.940 ?1.143) 0.004 ?0.012
(0.102 ?0.305) 0.093 ?0.104
(2.362 ?2.642) 0.050
(1.270)
typ 0.014 ?0.019
(0.356 ?0.482)
typ 0 ?8 typ note 1 0.005
(0.127)
rad min 0.009 ?0.013
(0.229 ?0.330) 0.016 ?0.050
(0.406 ?1.270) 0.291 ?0.299
(7.391 ?7.595)
(note 2) 45 0.010 ?0.029
(0.254 ?0.737) 2. these dimensions do not include mold flash or protrusions.
mold flash or protrusions shall not exceed 0.006 inch (0.15mm). related parts part number description comments ltc1257 complete serial i/o v out 12-bit dac 5v to 15v single supply in 8-pin so and pdip ltc1451/ltc1452/ltc1453 complete serial i/o v out 12-bit dacs 3v/5v single supply in 8-pin so and pdip ltc7541a parallel i/o mulitplying 12-bit dac 12-bit wide input ltc8043 serial mulitplying 12-bit dac 8-pin so and pdip
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