Voltage References

Symbol Pin
iHset
Hadvout
Hadv in
5
6
7
8
Clamp Pulse 9
8
Internal Equivalent Circuit
Note: All pins (except Vee and VEE) have ESO diodes between Vee and VEE·
10k
MC44615A
MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA
9-267
Description
Horizontal charge current set. An internally regulated
1.25 Vdc, and the external resistance (RHsetl at this pin
determines the horizontal free run charging current. Also, the
feedback current from the HpLL filter is input at this pin.
Horizontal Phase Detector output pin. An external filter
circuit between this pin and Pin 5 determines the selectivity
of the Phase Detector and provides the feedback path for
the Horizontal Phase-Locked-Loop.
Square wave output at the horizontal oscillator frequency.
An external RC added at this pin advances the phase of
the waveforms. External impedance to ground should be
> 4.0 fl, and < 20 ill
Horizontal phase detector input. The path between this
pin and Pin 7 can be used to delay the squared output
from the horizontal oscillator. This results in a phase
advance of the horizontal waveforms. Input impedance
is nominally 200 kQ .
Clamp Pulse output. This pulse is initiated by the vertical
and horizontal flyback pulses to enable the clamp circuits.
The timing of the pulse is shown in Figure 9.