SP504 Sipex, SP504 Datasheet - Page 14

• Manufacturer Part Number: SP504
• Description: WAN Multi-Mode Serial Transceiver
• Manufacturer: Sipex

Figure 14a. Charge Pump Phase 2 for ±10V.
Figure 15. Charge Pump Phase 3.
Phase 2 (±10V)
— V
nects the negative terminal of C
storage capacitor and the positive terminal of C
to ground, and transfers the generated –l0V or
the generated –5V to C
positive side of capacitor C
and the negative side is connected to ground.
Phase 2 (±5V)
— V
nected to V
is switched to ground and C
The 5V charge from Phase 1 is now transferred
Figure 17. Charge Pump Waveforms
Rev: A Date:1/27/04
+10V
–10V
GND
GND
C
C
2
2
–
+
SS
SS
C
C
transfer — Phase two of the clock con-
1
& V
1
+
–
+
–
V
V
–5V
CC
CC
CC
DD
= +5V
= +5V
to recharge the C
charge storage — C
–10V
C
C
2
2
+5V
+
–
+
–
–5V
3
. Simultaneously, the
2
1
–
+
is switched to +5V
+
–
is connected to C
C
–
C
C
C
4
4
3
–
3
+
–
+
1
capacitor. C
V
V
V
V
DD
DD
SS
SS
2
Storage Capacitor
Storage Capacitor
1
Storage Capacitor
Storage Capacitor
to the V
+
is recon-
SP504 Multi–Mode Serial Transceivers
SS
2
3
2
+
.
(a)
(b)
14
Figure 14b. Charge Pump Phase 2 for ±5V.
Figure 16. Charge Pump Phase 4.
to the V
continuous charge from either C
the C1 capacitor charged to 5V, the cycle begins
again.
Phase 3
clock is identical to the first phase — the charge
transferred in C
terminal of C
side of capacitor C
voltage potential across C
output, C
potential on C
— V
DD
C
C
1
1
charge storage — The third phase of the
+
–
SS
+
–
V
2
V
CC
+
CC
storage capacitor. V
is connected to ground so that the
= +5V
= +5V
1
, which is applied to the negative
2
1
is only +5V.
produces –5V in the negative
C
C
–5V
2
2
+10V
2
+
+
–
–
. Since C
© Copyright 2004 Sipex Corporation
2
is l0V. For the 5V
+
+
C
–
C
–
C
C
4
4
2
3
3
–
–
+
+
+
V
V
V
is at +5V, the
V
1
DD
DD
SS
SS
SS
or C
Storage Capacitor
Storage Capacitor
Storage Capacitor
Storage Capacitor
receives a
2
. With
GND
GND
+5V
–5V
C
C
2
2
+
–