iC149 preliminary PROGRAMMABLE ns-PULSE GENERATOR Rev A0.2, Page 1/6 FEATURES APPLICATIONS ♦ ♦ ♦ ♦ ♦ Pulse generator for fast laser diode drivers 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 BLOCK DIAGRAM Copyright © 2011 iC-Haus http://www.ichaus.com preliminary 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 coding switches in coarse and fine 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 Ω Item No. Symbol Parameter Conditions Unit Min. Typ. Max. 5 5.25 Power Supply 101 102 V5 Power Supply I(V5) Supply Current V5 = 5 V, S1 = OFF V5 = 5 V, S1 = ON, TRIGGER open V5 = 5 V, S1 = ON, TRIGGER 50 Ω vs. Ground 4.75 V 45 50 75 mA mA mA Pulse Width 201 Tpmax Maximum Pulsweite V5 = 5 V, Ta = 27 °C, coarse = "F", fine = "F" 63.75 ns 202 Tpmin Minimum Pulsweite V5 = 5 V, Ta = 27 °C, coarse = "0", fine = "C" 1 ns preliminary 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 m = 14 m = 13 m = 12 m = 11 m = 10 m= 9 m= 8 m= 7 m= 6 m= 5 m= 4 m= 3 m= 2 m= 1 ∆T = 15 * 4 ns = 60 ns ∆T = 14 * 4 ns = 56 ns ∆T = 13 * 4 ns = 52 ns ∆T = 12 * 4 ns = 48 ns ∆T = 11 * 4 ns = 44 ns ∆T = 10 * 4 ns = 40 ns ∆T = 9 * 4 ns = 36 ns ∆T = 8 * 4 ns = 32 ns ∆T = 7 * 4 ns = 28 ns ∆T = 6 * 4 ns = 24 ns ∆T = 5 * 4 ns = 20 ns ∆T = 4 * 4 ns = 16 ns ∆T = 3 * 4 ns = 12 ns ∆T = 2 * 4 ns = 8 ns ∆T = 1 * 4 ns = 4 ns (60.2 ns) (56.4 ns) (52.3 ns) (48.7 ns) (44.7 ns) (40.9 ns) (36.7 ns) (32.6 ns) (28.7 ns) (24.7 ns) (20.2 ns) (15.7 ns) (12.4 ns) (7.5 ns) (3.0 ns) Table 2: m = 1...15 (coarse), n = 0 (fine) n = 15 n = 14 n = 13 n = 12 n = 11 n = 10 n= 9 n= 8 n= 7 n= 6 n= 5 n= 4 n= 3 n= 2 n= 1 n= 0 ∆T = 4 ns + 15 * 0.25 ns = 7.75 ns ∆T = 4 ns + 14 * 0.25 ns = 7.50 ns ∆T = 4 ns + 13 * 0.25 ns = 7.25 ns ∆T = 4 ns + 12 * 0.25 ns = 7.00 ns ∆T = 4 ns + 11 * 0.25 ns = 6.75 ns ∆T = 4 ns + 10 * 0.25 ns = 6.50 ns ∆T = 4 ns + 9 * 0.25 ns = 6.25 ns ∆T = 4 ns + 8 * 0.25 ns = 6.00 ns ∆T = 4 ns + 7 * 0.25 ns = 5.75 ns ∆T = 4 ns + 6 * 0.25 ns = 5.50 ns ∆T = 4 ns + 5 * 0.25 ns = 5.25 ns ∆T = 4 ns + 4 * 0.25 ns = 5.00 ns ∆T = 4 ns + 3 * 0.25 ns = 4.75 ns ∆T = 4 ns + 2 * 0.25 ns = 4.50 ns ∆T = 4 ns + 1 * 0.25 ns = 4.25 ns ∆T = 4 ns + 0 * 0.25 ns = 4.00 ns (7.2 ns) (6.8 ns) (6.5 ns) (6.2 ns) (6.0 ns) (5.8 ns) (5.5 ns) (4.9 ns) (4.5 ns) (4.4 ns) (4.3 ns) (4.1 ns) (3.9 ns) (3.5 ns) (3.2 ns) (3.0 ns) Table 3: m = 1 (coarse), n = 1...15 (fine) n = 15 n = 14 n = 13 n = 12 n < 12 ∆T = 2.8 ns ±0.4ns ∆T = 2.5 ns ±0.4ns ∆T = 2.2 ns ±0.4ns ∆T = 1.0 ns ±0.4ns ∆T = 0.0 ns (2.8 ns) (2.6 ns) (2.1 ns) (1.1 ns) Table 4: m = 0 (coarse) und n ≥ 12 (fine) Formula to calculate the pulse width: ∆T = (m ∗ 4 ns + n ∗ 0.25 ns) ± 2 ns 1 ≤ m (coarse) ≤ 15, 0 ≤ n (fine)) ≤ 15, m = 0 s. Tab. 4 preliminary iC149 PROGRAMMABLE ns-PULSE GENERATOR Rev A0.2, Page 4/6 PIN CONFIGURATION J1 Figure 1: The populated PCB 16 pole pin header for power supply and signal outputs J2 RJ45 connector for output signals with LVDS or TTL/CMOS levels J3 TRIGGER: SMA connector for trigger output, Rout = 50 Ω JP1 Jumper at position 1-2 selects TTL/CMOS signals for J2 S1 Oscillator ON/OFF S2 Selector switch: programmable pulse or symmetrical 1 MHz signal S3 Coding switch fine S4 Coding switch coarse TP1 LVDS signal at J1 (must be terminated with 100 Ω 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 Figure 2: Pin configuration J1 iC149 preliminary PROGRAMMABLE ns-PULSE GENERATOR Rev A0.2, Page 5/6 SAMPLE PULSES Figure 3: Maximum pulse width Figure 5: Trigger and LVDS pulse Figure 4: Minimum pulse width Figure 6: Trigger and 1 MHz LVDS signal iC149 preliminary 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 specifications. 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