AD7560_15 Datasheet, PDF (1/11 Pages) Analog Devices – CMOS MONOLITHIC DC DC

N ANALOG
W DEVICES
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CMOSMonolithicDC-DC
VoltageConverte&r Reference
PRELIMINARY TECHNICAL DATA
FEATURES
Efficient Series Stacked dc/dc Converters Which
Provide Multiple Outputs From a Single + 5V
Supply (-5V, -10V, -15V, +10V, +15V)
On-Chip -10V Reference Voltage Output
High Reference Voltage Power Supply Rejection
Minimum Circuit Requires Only Two Low Cost
OBSOLETE Capacitors
APPLICATIONS
Negative Reference Voltage Generation for Data
Acquisition Systems, from a Single + 5V Supply
Op-Amp Supply Generation; :!:5V, :!: 15V
Low Power, High Efficiency Voltage Converter for
Single Battery Operation
GENERAL DESCRIPTION
The AD7S60 is a monolithic CMOS voltage converter plus
voltage reference circuit. It performs both voltage inversion and
subsequent voltage multiplication of the incoming positive supply
voltage. It contains two converter circuits, A and B, in series to
provide two negative output voltages of approximately - VDD
and - 3VDD from the + VDD input. The unregulated - 3VDD
output from converter B is used to generate an internal reference
voltageof - SV. This is buffered and amplified to provide a
PRODUCT HIGHLIGHTS
I. The AD7S60 produces multiple output voltages with a mini-
mum number of external components, e.g., basic configurations
require only two or four low cost general purpose electrolytic
capacitors.
2. A -JOV voltage reference output which can be powered
down if not required.
3. The SV CMOS compatible clock input can be driven from
an external clock source (for synchronization) or can be made
temperature compensated -lOV output (VREF, pin 9) which
to oscillate with the addition of an external capacitor.
can sink over LOmA. In applications where the reference output 4. All outputs are short-circuit proof and latch-up free.
is not required this section can be powered down via the reference
inhibit input INH, pin L
AD7560 FUNCTIONAL BLOCK DIAGRAM
An on-chip oscillator is provided to drive the converters. The
oscillator frequency is determined by the addition of an external
capacitor. Additionally, if converter synchronization to an external
clock source is required, the clock input can be driven directly
from a SV CMOS compatible clock source.
AD7560
R'N
R'N
RsN
+CI -CI v", Vc, +C3 -C3
VC4
INH AGND Vss
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