test and measurement products www.semtech.com _f[0 ] ch 0 dc sdou t cs * cl k sdin reset * a b cv b cv a busy * int * dv l dv h a b cv b cv a dv l dv h ch 1 dv t vc h vc l vc h vc l dv t dhi de n dhi * den* qa qb qa * qb * qa qb qa * qb * vc c vd d gn d ve e dhi de n dhi * de n gnd_sns * ref_in_hi ref_in_lo cal_ s[0] rref1[0 ] vaa duti o_ s[0] dutio_f[1] dutio_s[1] cal_s[ 1 ] rref1[1 ] rref2[0 ] rref2[1 ] sleep * test_mod e c o n t r o l anode_ f anode_ s duti o is c vc m is k is c vc m is k description revision 3, november 2, 2007 E8404A 100-500mhz dual channel, digitally programmed pin electronics solution functional block diagram applications features the E8404A has a driver and window comparator receiver and commutating load circuit for each channel with perfor - mance settings to save power or maximize bandwidth. all levels dacs for the driver, receiver and load are on-chip and are programmed via a high speed serial bus. each of the levels dacs have offset and gain registers for on-chip calibrations. the driver circuit is capable of forcing two levels to the dut (dvh and dvl) as well as a third voltage for a termination level (dvt) to terminate high-speed dut signals to the com - parator receivers into a high quality 50 ? load. the driver can also be confgured to a high impedance (hiz) state for an open termination of dut signals. waveform clamps are also available to clip the input signals from a dut when not using the driver as a termination. the clamps prevent refections from returning to the dut transmission line which can create timing errors and false triggering. all of the on-chip dac levels and confguration registers for each channel may be programmed via set commands. this pincast method of programming allows all channels in a system to be programmed concurrently with a simple set command whereby any pin channel that had been assigned to that set will respond. the two driver circuits may be placed into a differential drive mode. this reduces driver-to-driver skews to levels diffcult to achieve by external deskewing. the two window comparators may also be placed into a differential receive mode. these features enable higher quality testing of differential signals to/from the dut. ? two fully integrated pin channels including: - 16-bit dacs for each level - tri-level driver - window receiver - 4ma/40ma ranged active commutating load - waveform clamps ? driver, comparator and load maximum 8v span over -2 to +7v range ? confgurable output protection ? 50mhz serial bus programming - spi?/qspi?/ microwire? - daisy-chainable ? power dissipation ~0.9w/channel (quiescent, low perf, i/o mode) ~1.0w/channel (quiescent, high perf, i/o mode) ? pin and software compatible to e8400, e8405, e8410, e8415 ? digitally programmable performance/power ? differential drive and receive functionality ? optimal small swing performance ? small 11mm x 11mm package ? logic testers ? mixed-signal test equipment ? memory testers ? flash memory testers ? asic verifers spi and qspi and trademarks of motorola, inc. microwire is a trademark of national semiconductor corp. preliminary
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