SP782/784
®
Programmable Charge Pump
■ +5V Only Low Power Voltage Conversion
■ Programmable Between ±5V or ±10V
■ Low Power Shutdown Mode
Applications
■ RS-232/RS-423 transceiver power supplies
■ LCD BIAS Generator
■ OP-Amp Power Supplies
DESCRIPTION...
The SP782 and SP784 are monolithic programmable voltage converters that produce a
positive and negative voltage from a single supply. The SP782 and SP784 are programmable
such that the charge pump outputs either a ±10V voltage or a ±5V voltage by control of two
pins. Both products require four (4) charge pump capacitors to support the resulting output
voltages. The charge pump architecture (U.S. 5,760,637) is fabricated using a low power
BiCMOS process technology.
The SP782 and SP784 charge pumps can be powered from a single +5V supply. The low
power consumption makes these charge pumps ideal for battery operated equipment. Both
offer a shutdown feature that saves battery life. A system can essentially have four (4) different
supply voltages from a single battery. Typical applications are handheld instruments,
notebook and laptop computers, and data acquisition systems.
+5V
10µF
+
13
+5V
14
10µF
1
6
13
LATCH
C1+
VCC
5
1µF
3
5
SD
VDD
1
12
1µF
15
1µF
12
10µF
11
C1–
C2+
3
SP782
VSS
C2+
9
2
1µF
C2– GND
16 4
D0
9
D1
8
8
6
15
SP782/SP784 DS/08
10µF
VCC
10µF
+
14
C1+
C1–
C2–
11
SP784
D0
D1
VSS
LATCH
2
10µF
SD
SP782/784 Programmable Charge Pump
1
VDD
C2+ (b)
C2+ (a)
GND
16
4
© Copyright 2000 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
VCC...........................................................................+7V
VDD.........................................................................+11V
VSS.........................................................................–11V
Storage Temperature..........................-65˚C to +150˚C
Power Dissipation
16-pin Plastic DIP...........................1000mW
16-pin Plastic SOIC.........................1000mW
Package Derating:
16-pin Plastic DIP
øJA....................................................62 °C/W
16-pin Plastic SOIC
øJA....................................................62 °C/W
SP782 SPECIFICATIONS
Typical @ 25°C and VCC = VCC ± 5% unless otherwise noted.
MIN.
SUPPLY CURRENT
ICC
TYP.
MAX.
Shutdown ICC
POSITIVE CHARGE PUMP OUTPUT
VDD (2xVCC Output)
+9.5
8
2
25
+9.8
+10.0
+8.0
+8.5
+4.2
+4.5
+4.2
+4.5
NEGATIVE CHARGE PUMP OUTPUT
VSS (2xVCC Output)
–9.5
VSS (–VCC Output)
mA
mA
µA
VCC = +5V, RL = ∞, VO = 2xVCC
VCC = +5V, RL = ∞, VO = VCC
VCC = +5V, SD = VCC
Volts
VCC = +5V, D0 = 0V, D1 = 0V
RL = ∞
VCC = +5V, D0 = 0V, D1 = 0V
RL = 1kΩ
VCC = +5V, D0 = VCC, D1 = VCC
RL = ∞
VCC = +5V, D0 = VCC, D1 = VCC
RL = 1kΩ
CHARGE PUMP CAPACITORS: 1µF
Volts
+5.0
Volts
Volts
CHARGE PUMP CAPACITORS: 1µF
–9.8
–10.0
Volts
–8.0
–8.5
–4.2
–4.5
–4.0
–4.2
Volts
300
kHz
98
85
90
85
%
%
%
%
OSCILLATOR FREQUENCY
fOSC
VOLTAGE CONVERSION EFFICIENCY
95
VDD (2X VCC Output)
VDD (2X VCC Output)
80
VSS (2X VCC Output)
85
VSS (2X VCC Output)
80
POWER REQUIREMENTS
VCC
+4.75
ENVIRONMENTAL AND MECHANICAL
Operating Temperature Range
0
Storage Temperature Range
–65
SP782/SP784 DS/08
CONDITIONS
CHARGE PUMP CAPACITORS: 1µF
3
1
10
VDD (VCC Output)
UNITS
Volts
–5.0
Volts
+5.25
Volts
+70
+150
°C
°C
SP782/784 Programmable Charge Pump
2
VCC = +5V, D0 = 0V, D1 = 0V
RL = ∞
VCC = +5V, D0 = 0V, D1 = 0V
RL = 1kΩ
VCC = +5V, D0 = VCC, D1 = VCC
RL = ∞
VCC = +5V, D0 = VCC, D1 = VCC
RL = 1kΩ
SD = 0V
RL = ∞
RL = 1kΩ
RL = ∞
RL = 1kΩ
© Copyright 2000 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
VCC...........................................................................+7V
VDD.........................................................................+11V
VSS.........................................................................–11V
Storage Temperature..........................-65˚C to +150˚C
Power Dissipation
16-pin Plastic DIP...........................1000mW
16-pin Plastic SOIC.........................1000mW
Package Derating:
16-pin Plastic DIP
øJA....................................................62 °C/W
16-pin Plastic SOIC
øJA....................................................62 °C/W
SP784 SPECIFICATIONS
Typical @ 25°C and VCC = VCC ± 5% unless otherwise noted.
MIN.
SUPPLY CURRENT
ICC
TYP.
MAX.
Shutdown ICC
POSITIVE CHARGE PUMP OUTPUT
VDD (2xVCC Output)
+9.0
10
5
25
+9.8
+10.0
+8.0
+9.5
+4.5
+4.8
+4.2
+4.5
NEGATIVE CHARGE PUMP OUTPUT
VSS (2xVCC Output)
–9.0
VSS (–VCC Output)
mA
mA
µA
VCC = +5V, RL = ∞, VO = 2xVCC
VCC = +5V, RL = ∞, VO = VCC
VCC = +5V, SD = VCC
Volts
VCC = +5V, D0 = 0V, D1 = 0V
RL = ∞
VCC = +5V, D0 = 0V, D1 = 0V
RL = 1kΩ
VCC = +5V, D0 = VCC, D1 = VCC
RL = ∞
VCC = +5V, D0 = VCC, D1 = VCC
RL = 1kΩ
CHARGE PUMP CAPACITORS: 10µF
Volts
+5.0
Volts
Volts
CHARGE PUMP CAPACITORS: 10µF
–9.8
–10.0
Volts
–8.0
–9.5
–4.2
–4.5
–4.0
–4.2
Volts
300
kHz
98
95
98
95
%
%
%
%
OSCILLATOR FREQUENCY
fOSC
VOLTAGE CONVERSION EFFICIENCY
VDD (2X VCC Output)
90
VDD (2X VCC Output)
80
VSS (2X VCC Output)
90
VSS (2X VCC Output)
80
POWER REQUIREMENTS
VCC
+4.75
ENVIRONMENTAL AND MECHANICAL
Operating Temperature Range
0
Storage Temperature Range
–65
SP782/SP784 DS/08
CONDITIONS
CHARGE PUMP CAPACITORS: 10µF
5
1
10
VDD (VCC Output)
UNITS
Volts
–5.0
Volts
+5.25
Volts
+70
+150
°C
°C
SP782/784 Programmable Charge Pump
3
VCC = +5V, D0 = 0V, D1 = 0V
RL = ∞
VCC = +5V, D0 = 0V, D1 = 0V
RL = 1kΩ
VCC = +5V, D0 = VCC, D1 = VCC
RL = ∞
VCC = +5V, D0 = VCC, D1 = VCC
RL = 1kΩ
SD = 0V
RL = ∞
RL = 1kΩ
RL = ∞
RL = 1kΩ
© Copyright 2000 Sipex Corporation
AC CHARACTERISTICS*
(Typical @ 25°C and nominal supply voltages unless otherwise noted)
PARAMETER
MIN.
SP782 POWER-UP DELAY TIME
±10V OUTPUT
tDVDD; VDD Power On Delay
tDVSS; VSS Power-On Delay
±5V OUTPUT
tDVDD; VDD Power On Delay
tDVSS; VSS Power-On Delay
SP782 OUTPUT DELAY TIME
tSD1; Switching Delay
from ±10V to ±5V
tSD2; Switching Delay
from ±5V to ±10V
SP784 POWER-UP DELAY TIME
±10V OUTPUT
tDVDD; VDD Power On Delay
tDVSS; VSS Power-On Delay
±5V OUTPUT
tDVDD; VDD Power On Delay
tDVSS; VSS Power-On Delay
SP784 OUTPUT DELAY TIME
tSD1; Switching Delay
from ±10V to ±5V
tSD2; Switching Delay
from ±5V to ±10V
TYP.
MAX.
UNITS
CONDITIONS
1000
1000
µs
µs
RL = 1kΩ
RL = 1kΩ
10
150
µs
µs
RL = 1kΩ
RL = 1kΩ
1000
µs
RL = 1kΩ
500
µs
RL = 1kΩ
5
5
ms
ms
RL = 1kΩ
RL = 1kΩ
10
1000
µs
µs
RL = 1kΩ
RL = 1kΩ
10
ms
RL = 1kΩ
2
ms
RL = 1kΩ
* - Using the charge pump capacitor values specified in the previous pages for each device.
(a)
+5V
C2+
GND
(b)
GND
C2–
–5V
+10V
C2+
GND
GND
C2–
–10V
Figure 1. Charge Pump Waveforms
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
4
© Copyright 2000 Sipex Corporation
IDD(milliamps)
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
5.00
SP782 VDD vs IDD
D0 = D1 = 0V
ISS(milliamps)
O
10uF Curve
1uF Curve
0.1uF Curve
5.50
6.00
6.50
SP782 VSS vs ISS
0.00
-5.00
-10.00
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00
-10.00
VCC = 5.00V T = +25 C
7.00 7.50
VDD(volts)
D0 = D1 = 0V
8.00
8.50
9.00
9.50 10.00
VCC = 5.00V T = +25 C
O
10uF Curve
1uF Curve
0.1uF Curve
-9.50
-9.00
-7.50 -7.00
-8.50 -8.00
-6.50 -6.00
-5.50
-5.00
VSS(volts)
VDD (volts)
SP782 LOAD vs VDD
D0 = D1 = 0V
VCC = 5.00V T = +25 C
O
10.00
9.00
8.00
7.00
6.00
5.00
4.00
VDD - 10uF
VDD - 1uF
VDD - 0.1uF
0
500
1000
1500
2500
2000
3000
3500 4000
4500
5000
LOAD (ohms)
VSS (volts)
SP782 LOAD vs VSS
D0 = D1 = 0V
VCC = 5.00V T = +25 C
O
-4.00
-5.00
-6.00
-7.00
-8.00
-9.00
-10.00
VSS - 10uF
VSS - 1uF
VSS - 0.1uF
0
500
1000
1500
2500
2000
3000
3500 4000
4500
5000
LOAD(ohms)
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
5
© Copyright 2000 Sipex Corporation
SP782 VDD vs IDD D0 = D1 = 5V
VCC = 5.00V T = +25 C
40.00
10uF Curve
35.00
1uF Curve
30.00
0.1uF Curve
25.00
20.00
15.00
10.00
5.00
0.00
4.25
4.20
4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65
VDD(volts)
IDD(milliamps)
O
ISS(milliamps)
SP782
0.00
-5.00
-10.00
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00
-45.00
-4.40
-4.30
VDD (volts)
VSS (volts)
SP782/SP784 DS/08
VCC = 5.00V
T = +25 C
O
-4.20
-4.10 -4.00 -3.90 -3.80
VSS(volts)
LOAD vs VDD
D0 = D1 = 5V
-3.70 -3.60
VCC = 5.00V
-3.50
T = +25 C
O
VDD - 10uF
VDD - 1uF
VDD - 0.1uF
0
500
SP782
-4.00
-4.10
-4.20
-4.30
-4.40
-4.50
D0 = D1 = 5V
10uF Curve
1uF Curve
0.1uF Curve
SP782
4.50
4.40
4.30
4.20
4.10
4.00
VSS vs ISS
1000
1500
LOAD vs VSS
2000 2500 3000
LOAD(ohms)
D0 = D1 = 5V
3500 4000
VCC = 5.00V
5000
4500
T = +25 C
O
VSS - 10uF
VSS - 1uF
VSS - 0.1uF
0
500
1000
1500
2000 2500 3000
LOAD(ohms)
3500 4000
SP782/784 Programmable Charge Pump
6
4500
5000
© Copyright 2000 Sipex Corporation
IDD(milliamps)
ISS(milliamps)
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
5.00
0.00
-5.00
-10.00
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00
-10.00
SP784 VDD vs IDD
VDD (volts)
O
5.50
6.50
7.00 7.50
VDD(volts)
SP784 VSS vs ISS
D0 = D1 = 0V
6.00
8.00
8.50
9.00
9.50 10.00
VCC = 5.00V T = +25 C
O
10uF Curve
1uF Curve
0.1uF Curve
-9.50
-9.00
-8.50 -8.00 -7.50 -7.00
VSS(volts)
D0 = D1 = 0V
-6.50 -6.00
-5.00
-5.50
VCC = 5.00V T = +25 C
O
10.00
9.00
8.00
7.00
6.00
5.00
4.00
VDD - 10uF
VDD - 1uF
VDD - 0.1uF
0
500
1000
1500
SP784 LOAD vs VSS
VSS (volts)
VCC = 5.00V T = +25 C
10uF Curve
1uF Curve
0.1uF Curve
SP784 LOAD vs VDD
2000 2500 3000
LOAD(ohms)
D0 = D1 = 0V
3500 4000
4500
5000
VCC = 5.00V T = +25 C
O
-4.00
-5.00
-6.00
-7.00
-8.00
-9.00
-10.00
VSS - 10uF
VSS - 1uF
VSS - 0.1uF
0
SP782/SP784 DS/08
D0 = D1 = 0V
500
1000
1500
2000 2500
LOAD(ohms)
3000
3500 4000
SP782/784 Programmable Charge Pump
7
4500
5000
© Copyright 2000 Sipex Corporation
SP784 VDD vs IDD D0 = D1 = 5V VCC = 5.00V T = +25 C
40.00
10uF Curve
35.00
1uF Curve
30.00
0.1uF Curve
25.00
20.00
15.00
10.00
5.00
0.00
4.25
4.20
4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65
VDD(volts)
IDD(milliamps)
O
SP784 VSS vs ISS D0 = D1 = 5V VCC = 5.00V T = +25 C
0.00
10uF Curve
-5.00
1uF Curve
-10.00
0.1uF Curve
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00
-4.40 -4.30 -4.20 -4.10 -4.00 -3.90 -3.80 -3.70 -3.60 -3.50
VSS(volts)
ISS(milliamps)
O
VDD (volts)
SP784 LOAD vs VDD
500
1000
1500
SP784 LOAD vs VSS
VSS (volts)
VCC = 5.00V T = +25 C
O
VDD - 10uF
VDD - 1uF
VDD - 0.1uF
0
SP782/SP784 DS/08
D0 = D1 = 5V
4.50
4.40
4.30
4.20
4.10
4.00
-4.00
-4.10
-4.20
-4.30
-4.40
-4.50
2000 2500
LOAD(ohms)
D0 = D1 = 5V
3000
3500 4000
4500
5000
VCC = 5.00V T = +25 C
O
VSS - 10uF
VSS - 1uF
VSS - 0.1uF
0
500
1000
1500
2000 2500
LOAD(ohms)
3000
3500 4000
SP782/784 Programmable Charge Pump
8
4500
5000
© Copyright 2000 Sipex Corporation
VSS receives a continuous charge from either C1
or C2. With the C1 capacitor charged to 5V, the
cycle begins again.
THEORY OF OPERATION
The SP782/784's charge pump design is based
on Sipex's original patented charge pump design (5,306,954) which uses a four–phase voltage shifting technique to attain symmetrical
10V power supplies. In addition, the SP782/
784 charge pump incorporates a "programmable" feature that produces an output of ±10V
or ±5V for VSS and VDD by two control pins, D0
and D1. The charge pump requires external
capacitors to store the charge. Figure 1 shows
the waveform found on the positive and negative side of capcitor C2. There is a free–running
oscillator that controls the four phases of the
voltage shifting. A description of each phase
follows.
Phase 3
— VDD charge storage — The third phase of the
clock is identical to the first phase — the charge
transferred in C1 produces –5V in the negative
terminal of C1, which is applied to the negative
side of capacitor C2. Since C2+ is at +5V, the
voltage potential across C2 is l0V. For the 5V
output, C2+ is connected to ground so that the
potential on C2 is only +5V.
Phase 4
— VDD transfer — The fourth phase of the
clock connects the negative terminal of C2 to
ground and transfers the generated l0V or the
generated 5V across C2 to C4, the VDD storage
capacitor. Again, simultaneously with this, the
positive side of capacitor C1 is switched to +5V
and the negative side is connected to ground,
and the cycle begins again.
Phase 1 (±10V)
— VSS charge storage — During this phase of
the clock cycle, the positive side of capacitors
C1 and C2 are initially charged to +5V. Cl+ is
then switched to ground and the charge on C1–
is transferred to C2–. Since C2+ is connected to
+5V, the voltage potential across capacitor C2
is now 10V.
Since both VDD and VSS are separately generated from VCC in a no–load condition, VDD and
VSS will be symmetrical. Older charge pump
approaches that generate V– from V+ will show
a decrease in the magnitude of V– compared to
V+ due to the inherent inefficiencies in the
design.
Phase 1 (±5V)
— VSS & VDD charge storage and transfer —
With the C1 and C2 capacitors initially charged
to +5V, Cl+ is then switched to ground and the
charge on C1– is transferred to the VSS storage
capacitor. Simultaneously the C2– is switched
to ground and 5V charge on C2+ is transferred
to the VDD storage capacitor.
VCC = +5V
C4
+5V
+
Phase 2 (±10V)
— VSS transfer — Phase two of the clock
connects the negative terminal of C2 to the VSS
storage capacitor and the positive terminal of
C2 to ground, and transfers the generated –l0V
or the generated –5V to C3. Simultaneously,
the positive side of capacitor C 1 is switched to
+5V and the negative side is connected to
ground.
C1
+
C2
–
VDD Storage Capacitor
–
–5V
+
–
VSS Storage Capacitor
C3
–5V
Figure 2. Charge Pump Phase 1 for ±10V.
VCC = +5V
+5V
Phase 2 (±5V)
— VSS & VDD charge storage — C 1+ is
reconnected to V CC to recharge the C 1
capacitor. C2+ is switched to ground and C2– is
connected to C3. The 5V charge from Phase 1 is
now transferred to the VSS storage capacitor.
SP782/SP784 DS/08
–
+
C4
+
C1
+
–
C2
–
+
VDD Storage Capacitor
–
–5V
–
+
VSS Storage Capacitor
C3
Figure 3. Charge Pump Phase 1 for ±5V.
SP782/784 Programmable Charge Pump
9
© Copyright 2000 Sipex Corporation
VCC = +5V
VCC = +5V
C4
C4
+
C1
+
C2
–
–
+
+
VDD Storage Capacitor
C1
–
–10V
+
–
+
C2
–
Figure 5. Charge Pump Phase 2 for ±5V.
VCC = +5V
VCC = +5V
+5V
C4
+
C2
–
VSS Storage Capacitor
C3
Figure 4. Charge Pump Phase 2 for ±10V.
C1
+
–
C3
+
VDD Storage Capacitor
–
–5V
VSS Storage Capacitor
–
+
C4
+10V
–
+
+
VDD Storage Capacitor
C1
–
+
–
C2
–
+
VDD Storage Capacitor
–
–5V
–
–5V
+
–
VSS Storage Capacitor
+
VSS Storage Capacitor
C3
C3
Figure 6. Charge Pump Phase 3.
Figure 7. Charge Pump Phase 4.
The oscillator frequency or clock rate for
the charge pump is designed for low power
operation. The oscillator changes from a high
frequency mode (400kHz) to a low frequency
mode (20kHz) when the SD pin goes to a logic
"1". The lower frequency allows the SP782/
SP784 to conserve power when the outputs are
not being used.
save board space, lower values will reduce the
output drive capability.
The output voltage ripple is also affected by the
capacitors, specifically C3 and C4. Larger values will reduce the output ripple for a given load
of current. The current drawn from either output
is supplied by just the storage capacitor, C3 or
C4, during one half cycle of the internal oscillator. Note that the output current from the postive
charge pump is the load current plus the current
taken by the negative charge pump. Thus the
formula representation for the output ripple
voltage is:
EFFICIENCY INFORMATION
A charge pump theoretically produces a doubled
voltage at 100% efficiency. However in the real
world, there is a small voltage drop on the output
which reduces the output efficiency. The SP782
and SP784 can usually run 99.9% efficient without driving a load. While driving a 1kΩ load, the
SP782 and SP784 remain at least 90% efficient.
VRIPPLE+ = {1 / (fOSC) * 1 / C3} * 0.5 * IOUT+
VRIPPLE– = {1 / (fOSC) * 1 / C3} * 0.5 * IOUT–
To minimize the output ripple, the C3 and C4
storage capacitors can be increased to over 10µF
whereas the pump capacitors can range from
1µF to 5µF.
Total Output Voltage Efficiency =
[(VOUT+) / (2*VCC)] + [(VOUT–) / (–2*VCC)] ;
VOUT+ = 2*VCC + VDROP+
VOUT– = –2*VCC + VDROP–
VDROP– = (I–)*(ROUT–)
VDROP+ = (I+)*(ROUT+)
Multiple SP782/784 charge pumps can be
connected in parallel. However, the output
resistance on both pump outputs will be
reduced. The effective output resistance is the
output resistance of one pump divided by the
number of charge pumps connected. It is
important to keep the C1 and C2 capacitors
separate for each charge pump. The storage
capacitors, C3 and C4, can be shared.
Power Loss = IOUT*(VDROP)
The efficiency changes as the external charge
pump capacitors are varied. Larger capacitor
values will strengthen the output and reduce
output ripple usually found in all charge pumps.
Although smaller capacitors will cost less and
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
10
© Copyright 2000 Sipex Corporation
SHUTDOWN MODE
The internal oscillator of the SP782 and SP784
can be shutdown through the SD pin. In this
state, the VDD and VSS outputs are inactive and
the power supply current reduces to 10µA.
The RS-423 driver output voltage range is
±4.0V to ±6.0V. When the SP524 transceiver is
programmed to RS-423 mode (V.10), the charge
pump now provides ±5V, through D0 and D1,
thus allowing the driver outputs to comply with
VOC ≤ 6.0V as well as the VT requirement of
±4.0V minimum with a 450Ω load to ground.
LATCH ENABLE PIN
The SP782 and SP784 includes a control pin
(LAT) that latches the D0 and D1 control lines.
Connecting this pin to a logic HIGH state will
allow transparent operation of the D0 and D1
control lines. This input can be left floating
since there is an internal pull-up resistor which
will allow the latch to be transparent.
In older configurations, separate DC sources
needed to be configured or regulated down from
±10V to ±5V in a given application. A typical
charge pump providing VDD and VSS would
require external clamping such as 5V Zener
diodes. RS-423 (V.10) is usually found in
RS-449, EIA-530, EIA-530A, and V.36 modes.
APPLICATIONS INFORMATION
The SP782 and SP784 can be used in various
applications where ±10V is needed from a +5V
source. Analog switches, op-amp power supplies, and LCD biasing are some applications
where the charge pumps can be used.
When the control lines D0 and D1 are both at a
logic HIGH, VDD = +5V and VSS = -5V. All
other inputs to the control lines result in VDD =
+10V and VSS = -10V. Control of the SP784 in
an application with Sipex's SP524 can be found
in Figure 8.
The charge pump can also be used for supplying
voltage rails for RS-232 drivers needing ±12V.
The ±10V output from the charge pump is more
than adequate to provide the proper VOH and
VOL levels at the driver output.
Figure 8 shows how the SP784 can be used
in conjunction with the SP524 multiprotocol
transceiver IC. The programmability is ideal for
RS-232 and RS-423 levels. The RS-232 driver
output voltage swing ranges from ±5V to ±15V.
In order to meet this requirement, the charge
pump must generate ±10V to the transceiver IC.
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
11
© Copyright 2000 Sipex Corporation
+5V
10µF
+
13
14
10µF
VCC
C1+
10µF
1
12
5
10µF
3
9
8
6
15
C1–
VDD
C2+ (b)
11
C2+ (a)
C2–
SP784
D0
D1
VSS
EN
2
10µF
SD
GND
16
4
+5V
10µF
+
28
14
2
VCC
VDD
19
29
VSS
VCC VCC
SP524
LATCH_EN
30
31
DP0
DECODER LOGIC
32
DP1
24
T1IN
36
ENT1
VDD
25
T2IN
35
ENT2
44
R1OUT
40
VSS
0
0
+10V
-10V
0
1
+10V
-10V
1
0
+10V
-10V
1
1
+5V
-5V
T2
R1
ENR1
43
R2OUT
39
LOOPBACK PATHS
D1
T1OUTA
22
T1OUTB
20
T1
T2OUTA
18
T2OUTB
17
R1INA
3
R1INB
4
R2INA
5
R2INB
6
R2
ENR2
26
T3IN
34
ENT3
T3OUTA
16
T3OUTB
15
T3
27
T4IN
33
ENT4
42
R3OUT
38
ENR3
41
R4OUT
37
T4
R3
LOOPBACK PATHS
D0
LOOPBCK
23
T4OUTA
13
T4OUTB
11
R3INA
7
R3INB
8
R4INA
9
R4INB
10
R4
ENR4
GND
1
GND
12
GND
21
Figure 8. SP784 Application w/ SP524 Multi-Protocol Transceiver IC.
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
12
© Copyright 2000 Sipex Corporation
+5V
10µF
+
6
14
13
LATCH
C1+
VCC
SD
VDD
1µF
1
12
5
1µF
3
1µF
15
11
C1–
C2+
SP782
VSS
C2+
2
1µF
C2– GND
16 4
D0
9
D1
8
+5V
10µF
+
13
14
C1+
10µF
VCC
10µF
1
C1–
12
5
10µF
3
9
8
6
VDD
C2+ (b)
11
C2+ (a)
C2–
SP784
D0
D1
VSS
LATCH
2
10µF
SD
15
GND
16
4
Figure 9. SP782 and SP784 Block Diagrams
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
13
© Copyright 2000 Sipex Corporation
PACKAGE:
E
PLASTIC
SMALL OUTLINE (SOIC)
(WIDE)
H
D
A
Ø
e
B
A1
L
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
SP782/SP784 DS/08
16–PIN
A
0.093/0.104
(2.352/2.649)
A1
0.004/0.012
(0.102/0.300)
B
0.013/0.020
(0.330/0.508)
D
0.398/0.406
(10.11/10.31)
E
0.291/0.299
(7.402/7.600)
e
0.050 BSC
(1.270 BSC)
H
0.394/0.419
(10.00/10.64)
L
0.016/0.050
(0.406/1.270)
Ø
0°/8°
(0°/8°)
SP782/784 Programmable Charge Pump
14
© Copyright 2000 Sipex Corporation
PACKAGE:
16-PIN PLASTIC
DUAL–IN–LINE
(NARROW)
E1 E
D1 = 0.005" min.
(0.127 min.)
A1 = 0.015" min.
(0.381min.)
D
A
C
A2
e = 0.100 BSC
(2.540 BSC)
Ø
L
B1
B
eA = 0.300 BSC
(7.620 BSC)
ALTERNATE
END PINS
(BOTH ENDS)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
SP782/SP784 DS/08
16–PIN
A
–/0.210
(–/5.334)
A2
0.115/0.195
(2.921/4.953)
B
0.014/0.022
(0.356/0.559)
B1
0.045/0.070
(1.143/1.778)
C
0.008/0.014
(0.203/0.356)
D
0.780/0.800
(19.812/20.320)
E
0.300/0.325
(7.620/8.255)
E1
0.240/0.280
(6.096/7.112)
L
0.115/0.150
(2.921/3.810)
Ø
0°/ 15°
(0°/15°)
SP782/784 Programmable Charge Pump
15
© Copyright 2000 Sipex Corporation
ORDERING INFORMATION
Model
Temperature Range
Package Types
SP782CP .......................................................................... 0°C to +70°C ..................................................................................... 16-pin Plastic DIP
SP784CP .......................................................................... 0°C to +70°C ..................................................................................... 16-pin Plastic DIP
SP782CT ........................................................................... 0°C to +70°C .............................................................................................. 16-pin SOIC
SP784CT ........................................................................... 0°C to +70°C .............................................................................................. 16-pin SOIC
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: [email protected]
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
16
© Copyright 2000 Sipex Corporation