DS1090U-32+T Maxim Integrated Products, DS1090U-32+T Datasheet - Page 8

• Manufacturer Part Number: DS1090U-32+T
• Description: IC ECONOSCILLATOR SS 8-USOP
• Manufacturer: Maxim Integrated Products
• Series: EconOscillator™r
• Type: Clock Generatorr

Specifications of DS1090U-32+T

• Pll: No
• Input: Clock
• Output: CMOS, TTL
• Number Of Circuits: 1
• Ratio - Input:output: 1:1
• Differential - Input:output: No/No
• Frequency - Max: 250kHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Frequency-max: 250kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Dither amplitude (measured in percent ± from the mas-
ter oscillator center frequency) is set using input pins
J0 and J1. This circuit uses a sense current from the
master oscillator bias circuit to adjust the amplitude of
the triangle-wave signal to a voltage level that modu-
lates the master oscillator to a percentage of its resis-
tor-set center frequency. This percentage is set in the
end application to be 0%, 2%, 4%, or 8% (see Table 2).
The DS1090 is intended to provide a fixed-frequency,
dithered clock to be used as a clock driver for DC-DC
converters and other applications requiring a low-
frequency EMI-reduced clock oscillator. All control pins
must be biased per Tables 1 and 2 for proper operation
for the individual application’s requirements. R
be tied to ground (GND) by a customer-supplied resistor.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
Low-Frequency, Spread-Spectrum
EconOscillator
Table 2. Dither Percentage Setting
J1
0
0
1
1
is a registered trademark of Dallas Semiconductor Corporation.
Application Information
J0
Dither Percentage Settings
0
1
0
1
DITHER PERCENT (%)
Pin Connection
0
2
4
8
SET
must
The value of the resistor used to select the desired fre-
quency is calculated using the formula in the Master
Oscillator section (see also Figure 1). It is recommended
to use, at minimum, a 1%-tolerance, 1/16th-watt compo-
nent with a temperature coefficient that satisfies the over-
all stability requirements desired of the end-equipment.
Place the external R
minimize lead inductance.
To achieve best results, it is highly recommended that a
decoupling capacitor is used on the IC power-supply
pins. Typical values of decoupling capacitors are 0.01µF
and 0.1µF. Use a high-quality, ceramic, surface-mount
capacitor, and mount it as close as possible to the V
and GND pins of the IC to minimize lead inductance.
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.
TRANSISTOR COUNT: 1883
SUBSTRATE CONNECTED TO GROUND
is a registered trademark of Maxim Integrated Products.
SET
Package Information
Power-Supply Decoupling
resistor as close as possible to
R
SET
Chip Information
Resistor Selection
CC