IC149 programmable ns-pulse generator rev a0.2, page 1/ 6 features ? pulse width 1 bis 64 ns in steps of 0.25 ns ? fixed frequency of 1 mhz ? lvds und ttl outputs ? compatible with hg1d, nzn1d, nzp1d applications ? pulse generator for fast laser diode drivers block diagram copyright ? 2011 ic-haus http://www.ichaus.com p r e l i m i n a r y p r e l i m i n a r y
IC149 programmable ns-pulse generator rev a0.2, page 2/ 6 description pulse generator IC149 produces pulses with a small duty cycle in the range of ca. 1 ns up to 64 ns max. in steps of 0.25 ns at a pulse frequency of 1 mhz. the pulse width is set by means of two hexadecimal cod- ing switches in coarse and ?ne steps. the pulses are output both as lvds and ttl signals. this module can easily be used with the evaluation boards hg1d, nzn1d ans nzp1d. electrical characteristics test conditions: vs = 15 v, ta = 25 c, system impedace 50
item symbol parameter conditions unit no. min. typ. max. power supply 101 v5 power supply 4.75 5 5.25 v 102 i(v5) supply current v5 = 5 v, s1 = off 45 ma v5 = 5 v, s1 = on, trigger open 50 ma v5 = 5 v, s1 = on, trigger 50
vs. ground 75 ma pulse width 201 tp max maximum pulsweite v5 = 5 v, ta = 27 c, coarse = "f", ?ne = "f" 63.75 ns 202 tp min minimum pulsweite v5 = 5 v, ta = 27 c, coarse = "0", ?ne = "c" 1 ns p r e l i m i n a r y p r e l i m i n a r y
IC149 programmable ns-pulse generator rev a0.2, page 3/ 6 setting the pulse width typical pulse widths as follows (measured values in parentheses): m = 15 t = 15 * 4 ns = 60 ns (60.2 ns) m = 14 t = 14 * 4 ns = 56 ns (56.4 ns) m = 13 t = 13 * 4 ns = 52 ns (52.3 ns) m = 12 t = 12 * 4 ns = 48 ns (48.7 ns) m = 11 t = 11 * 4 ns = 44 ns (44.7 ns) m = 10 t = 10 * 4 ns = 40 ns (40.9 ns) m = 9 t = 9 * 4 ns = 36 ns (36.7 ns) m = 8 t = 8 * 4 ns = 32 ns (32.6 ns) m = 7 t = 7 * 4 ns = 28 ns (28.7 ns) m = 6 t = 6 * 4 ns = 24 ns (24.7 ns) m = 5 t = 5 * 4 ns = 20 ns (20.2 ns) m = 4 t = 4 * 4 ns = 16 ns (15.7 ns) m = 3 t = 3 * 4 ns = 12 ns (12.4 ns) m = 2 t = 2 * 4 ns = 8 ns (7.5 ns) m = 1 t = 1 * 4 ns = 4 ns (3.0 ns) table 2: m = 1...15 ( coarse ), n = 0 ( ?ne ) n = 15 t = 4 ns + 15 * 0.25 ns = 7.75 ns (7.2 ns) n = 14 t = 4 ns + 14 * 0.25 ns = 7.50 ns (6.8 ns) n = 13 t = 4 ns + 13 * 0.25 ns = 7.25 ns (6.5 ns) n = 12 t = 4 ns + 12 * 0.25 ns = 7.00 ns (6.2 ns) n = 11 t = 4 ns + 11 * 0.25 ns = 6.75 ns (6.0 ns) n = 10 t = 4 ns + 10 * 0.25 ns = 6.50 ns (5.8 ns) n = 9 t = 4 ns + 9 * 0.25 ns = 6.25 ns (5.5 ns) n = 8 t = 4 ns + 8 * 0.25 ns = 6.00 ns (4.9 ns) n = 7 t = 4 ns + 7 * 0.25 ns = 5.75 ns (4.5 ns) n = 6 t = 4 ns + 6 * 0.25 ns = 5.50 ns (4.4 ns) n = 5 t = 4 ns + 5 * 0.25 ns = 5.25 ns (4.3 ns) n = 4 t = 4 ns + 4 * 0.25 ns = 5.00 ns (4.1 ns) n = 3 t = 4 ns + 3 * 0.25 ns = 4.75 ns (3.9 ns) n = 2 t = 4 ns + 2 * 0.25 ns = 4.50 ns (3.5 ns) n = 1 t = 4 ns + 1 * 0.25 ns = 4.25 ns (3.2 ns) n = 0 t = 4 ns + 0 * 0.25 ns = 4.00 ns (3.0 ns) table 3: m = 1 ( coarse ), n = 1...15 ( ?ne ) n = 15 t = 2.8 ns 0.4ns (2.8 ns) n = 14 t = 2.5 ns 0.4ns (2.6 ns) n = 13 t = 2.2 ns 0.4ns (2.1 ns) n = 12 t = 1.0 ns 0.4ns (1.1 ns) n < 12 t = 0.0 ns table 4: m = 0 ( coarse ) und n 12 ( ?ne ) formula to calculate the pulse width: t = ( m 4 ns + n 0.25 ns ) 2 ns 1 m (coarse) 15, 0 n (?ne)) 15, m = 0 s. tab. 4 p r e l i m i n a r y p r e l i m i n a r y
IC149 programmable ns-pulse generator rev a0.2, page 4/ 6 pin configuration figure 1: the populated pcb figure 2: pin con?guration j1 j1 16 pole pin header for power supply and sig- nal outputs j2 rj45 connector for output signals with lvds or ttl/cmos levels j3 trigger: sma connector for trigger output, rout = 50
jp1 jumper at position 1-2 selects ttl/cmos signals for j2 s1 oscillator on/off s2 selector switch: programmable pulse or sym- metrical 1 mhz signal s3 coding switch ?ne s4 coding switch coarse tp1 lvds signal at j1 (must be terminated with 100
for measurement purpose) tp2 lvds signal at j1 tp3 ttl/cmos signal at j1 tp4 lvds signal at j2 gnd gnd v5 v5 3v3 3.3 v table 5: connectors on the pcb p r e l i m i n a r y p r e l i m i n a r y
IC149 programmable ns-pulse generator rev a0.2, page 5/ 6 sample pulses figure 3: maximum pulse width figure 4: minimum pulse width figure 5: trigger and lvds pulse figure 6: trigger and 1 mhz lvds signal p r e l i m i n a r y p r e l i m i n a r y
IC149 programmable ns-pulse generator rev a0.2, page 6/ 6 block diagram figure 7: block diagram of the IC149 ic-haus expressly reserves the right to change its products and/or speci?cations. an info letter gives details as to any amendments and additions made to the relevant current speci?cations on our internet website www.ichaus.de/infoletter ; this letter is generated automatically and shall be sent to registered users by email. copying C even as an excerpt C is only permitted with ic-haus approval in writing and precise reference to source. ic-haus does not warrant the accuracy, completeness or timeliness of the speci?cation and does not assume liability for any errors or omissions in these materials. the data speci?ed is intended solely for the purpose of product description. no representations or warranties, either express or implied, of merchantability, ?tness for a particular purpose or of any other nature are made hereunder with respect to information/speci?cation or the products to which information refers and no guarantee with respect to compliance to the intended use is given. in particular, this also applies to the stated possible applications or areas of applications of the product. ic-haus conveys no patent, copyright, mask work right or other trade mark right to this product. ic-haus assumes no liability for any patent and/or other trade mark rights of a third party resulting from processing or handling of the product and/or any other use of the product. as a general rule our developments, ips, principle circuitry and range of integrated circuits are suitable and speci?cally designed for appropriate use in technical applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. in principle the range of use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued annually by the bureau of statistics in wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in hanover (hannover-messe). we understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations of patent law. our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can be put to. p r e l i m i n a r y p r e l i m i n a r y
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