preliminary

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 ∆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 (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)

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 (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