IC149 Datasheet, PDF (3/6 Pages) IC-Haus GmbH – PROGRAMMABLE ns-PULSE GENERATOR

iC149
preliminary
PROGRAMMABLE ns-PULSE GENERATOR
SETTING THE PULSE WIDTH
Rev A0.2, Page 3/6
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)
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
Table 2: m = 1...15 (coarse), n = 0 (fine)
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 (fine)