TLC2940_06 Datasheet, PDF (1/10 Pages) Texas Instruments – HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR

TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
D Stable Oscillation Using External Resistor
D Lock Frequency Range:
– 35 MHz to 75 MHz (V_DD = 5 V ± 0.25 V,
T_A = – 20°C to 85°C)
– 28 MHz to 50 MHz (V_DD = 3 V ± 0.15 V,
T_A = – 20°C to 85°C)
D Operating Free-Air Temperature Range,
T_A = – 20°C to 85°C
D 8-Pin Thin Shrinked Small-Outline Package
LOGIC V_DD
VCO OUT
FREFINPUT
PFD OUT
SLAS244 – OCTOBER 1999
PW PACKAGE
(TOP VIEW)
1
8
VCO V_DD
2
7
BIAS
3
6
VCOIN
4
5
GND
description
The TLC2940 is a high-performance analog voltage-controlled oscillator (VCO) using Texas Instruments
0.8-µm CMOS process. The VCO oscillating operation can be performed by an external bias resistor connected
to the internal oscillation circuitry, and the oscillation frequency range is set by this bias resistor. The lock
frequency range for PLL applications is from 35 MHz to 75 MHz (over operating free-air temperature range,
V_DD = 5 V ± 5%), and from 28 MHz to 50 MHz (over operating free-air temperature range, V_DD = 3 V ± 5%).
The stable analog PLL can be configured within these frequency ranges.
The device is available in an 8-pin TSSOP surface-mount package.
The PLL block is configured using a counter, a required LPF, and a phase frequency detector (PFD).
AVAILABLE OPTIONS
PACKAGE
TA
TSSOP
(PW)
– 20°C to 85°C
TLC2940IPW
functional block diagram
BIAS
RESISTOR
VCO CONTROL
VCOIN
Bias
Circuit
VCO OUT
TLC2940
VCO
BIAS
Output
Buffer
VCO OUT
VCOIN
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright © 1999, Texas Instruments Incorporated
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