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LTC6990
8
6990fc
For more information www.linear.com/LTC6990
PIN FUNCTIONS
V+ (Pin 1/Pin 5): Supply Voltage (2.25V to 5.5V). This
supply must be kept free from noise and ripple. It should
be bypassed directly to the GND pin with a 0.1F capacitor.
DIV (Pin 2/Pin 4): Programmable Divider and Hi-Z Mode
Input. A V+ referenced A/D converter monitors the DIV
pin voltage (VDIV) to determine a 4-bit result (DIVCODE).
VDIV may be generated by a resistor divider between V+
and GND. Use 1% resistors to ensure an accurate result.
The DIV pin and resistors should be shielded from the
OUT pin or any other traces that have fast edges. Limit
the capacitance on the DIV pin to less than 100pF so that
VDIV settles quickly. The MSB of DIVCODE (Hi-Z) deter-
mines the behavior of the output when OE is driven low.
If Hi-Z = 0 the output is pulled low when disabled. If Hi-Z
= 1 the output is placed in a high impedance condition
when disabled.
SET (Pin 3/Pin 3): Frequency-Setting Input. The voltage
on the SET pin (VSET) is regulated to 1V above GND. The
amount of current sourced from the SET pin (ISET) pro-
grams the master oscillator frequency. The ISET current
range is 1.25A to 40A. The output oscillation will stop
if ISET drops below approximately 500nA. A resistor con-
nected between SET and GND is the most accurate way to
set the frequency. For best performance, use a precision
metal or thin film resistor of 0.5% or better tolerance and
50ppm/°C or better temperature coefficient. For lower ac-
curacy applications an inexpensive 1% thick film resistor
may be used.
Limit the capacitance on the SET pin to less than 10pF
to minimize jitter and ensure stability. Capacitance less
than 100pF maintains the stability of the feedback circuit
regulating the VSET voltage.
(DCB/S6)
OE (Pin 4/Pin 1): Output Enable. Drive high to enable the
output driver (Pin 6). Driving OE low disables the output
asynchronously, so that the output is immediately forced
low (Hi-Z = 0) or floated (Hi-Z = 1). When enabled, the
output may temporarily remain low to synchronize with
the internal oscillator in order to eliminate pulse slivers.
GND(Pin5/Pin2):Ground.Tietoalowinductanceground
plane for best performance.
OUT (Pin 6/Pin 6): Oscillator Output. The OUT pin swings
fromGNDtoV+withanoutputresistanceofapproximately
30. When driving an LED or other low-impedance load
a series output resistor should be used to limit source/
sink current to 20mA.
6990 PF
LTC6990
OE
GND
SET
OUT
V+
DIV
C1
0.1F
RSET
R2
R1
V+
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