TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
D
D
D
D
PW PACKAGE
(TOP VIEW)
Stable Oscillation Using External Resistor
Lock Frequency Range:
– 35 MHz to 75 MHz (VDD = 5 V ± 0.25 V,
TA = – 20°C to 85°C)
– 28 MHz to 50 MHz (VDD = 3 V ± 0.15 V,
TA = – 20°C to 85°C)
Operating Free-Air Temperature Range,
TA = – 20°C to 85°C
8-Pin Thin Shrinked Small-Outline Package
LOGIC VDD
VCO OUT
FREFINPUT
PFD OUT
1
2
3
4
8
7
6
5
VCO VDD
BIAS
VCOIN
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,
VDD = 5 V ± 5%), and from 28 MHz to 50 MHz (over operating free-air temperature range, VDD = 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
Output
Buffer
Bias
Circuit
VCO OUT
VCO CONTROL
VCOIN
TLC2940
VCO OUT
VCO
BIAS
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.
Copyright 1999, Texas Instruments Incorporated
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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TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
Terminal Functions
TERMINAL
NAME
NO.
BIAS
7
FREFINPUT
GND
I/O{
DESCRIPTION
M
Bias supply terminal for internal VCO. The resistor should be located between VDD and this terminal.
3
I
Not used. This terminal should be tied to ground.
5
PS
Ground
LOGIC VDD
1
PS
Power supply for the internal logic circuitry (PFD portion, input/output portion). It is recommended that this
terminal is separated from the VCO supply voltage terminal.
PFD OUT
4
O
Not used. This terminal should be unconnected (open).
VCOIN
6
I
VCO control voltage input.
VCO OUT
2
O
VCO output. This terminal is tied to a low level at inhibit status.
VCO VDD
8
PS Supply voltage for VCO analog portion.
† I: Input, O: Output, PS: Power supply/GND, M: Others
detailed description
The TLC2940 is an analog VCO IC that generates a frequency that is a multiple of a reference frequency for
a PLL block configuration. Normally, a PLL block is composed of a VCO, a phase frequency detector, counter
logic, and a loop filter.
The following is a description for the analog VCO of the TLC2940.
The built-in analog VCO is composed of a ring oscillator portion for oscillation operation and a bias control
portion to generate a bias level to supply to the ring oscillator. The oscillation operation is performed by a bias
resistor (RBIAS) connected between the bias control (pin 7) and the supply voltage (pin 8). The VCO oscillation
frequency is determined by this resistor value, RBIAS, that is, the oscillation frequency decreases as the resistor
value increases, and the oscillation frequency increases as the resistor value decreases. The lock frequency
range is from 35 MHz to 75 MHz with a RBIAS of 1.5 kΩ to 4.3 kΩ at 5-V operation and from 28 MHz to 50 MHz
with a RBIAS of 1.5 kΩ to 2.7 kΩ at 3-V operation over the recommended supply voltage and operating free-air
temperature range.
Refer to the curves shown in the typical characteristics section for the lock frequency ranges with varying RBIAS
values.
VCO Oscillation
VCO Oscillation Frequency Range
Bias Resistor (RBIAS)
VCO Control Voltage (VCOIN)
Figure 1. VCO Oscillation Frequency Range Setting
2
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TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
absolute maximum ratings over operating free-air temperature (unless otherwise noted)†
Supply voltage (any supply), VDD (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage range (any input), VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VDD + 0.5 V
Input current (any input), II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA
Output current (any output), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA
Continuous total power dissipation (TA = 25°C or below), PD (see Note 2) . . . . . . . . . . . . . . . . . . . . . . 700 mW
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 20°C to 85°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values are with respect to network GND terminals.
2. For operation above 25°C free-air temperature, derate linearly at the rate of 5.6 mW/°C.
recommended operating conditions
PARAMETER
Supply voltage
voltage, VDD (any supply,
supply see Notes 3 and 4)
MIN
NOM
MAX
3-V operation
2.85
3
3.15
5-V operation
4.75
5
5.25
Input voltage, VI (inputs except VCO IN)
0
Output current, IO (any output)
0
VCO control voltage at VCO IN
1
RBIAS = 1.5 kΩ
42
VDD–0.5
50
RBIAS = 1.8 kΩ
37
47
RBIAS = 2.2 kΩ
33
45
RBIAS = 2.7 kΩ
28
42
RBIAS = 1.5 kΩ
65
75
RBIAS = 2.4 kΩ
50
65
RBIAS = 3.3 kΩ
43
56
RBIAS = 4.3 kΩ
35
50
3-V operation
1.5
2.7
5-V operation
1.5
4.3
–20
85
3 V operation
3-V
Lock frequency
5 V operation
5-V
resistor RBIAS
VCO oscillation frequency setting resistor,
VDD
±2
Operating free-air temperature, TA
UNIT
V
V
mA
V
MHz
kΩ
°C
NOTES: 3. It is recommended that the logic supply terminal (LOGIC VDD) and the VCO supply terminal (VCO VDD) should be at the same voltage
and separate from each other.
4. The bypass capacitor should be located as close as possible to each power supply.
5. The FREFINPUT (pin 3) and PFD OUT (pin 4) terminals are input/output terminals preset for logic function respectively. In normal
operation, the FREFINPUT shoud be tied to GND and PDF OUT should be left unconnected (open).
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TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
electrical characteristics over recommended operating free-air temperature range, VDD = 3 V
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
2.4
UNIT
VOH
VOL
High-level output voltage, VCO OUT
Low-level output voltage, VCO OUT
IOH = – 2 mA
IOL = 2 mA
V
Zi(VCOIN)
IDD(VCO)
Input impedance at VCOIN
VCO IN = 1/2 VDD
Supply current
See Note 6
fosc
Oscillation frequency
RBIAS = 2.4 kΩ, VCOIN = 1/2 VDD
tr
Output rise time
VCOIN = 0 V, RBIAS =2.4 kΩ ,
CL = 15 pF
13
ns
tf
Output fall time
VCOIN = 0 V, RBIAS =2.4 kΩ ,
CL = 15 pF
6
ns
Output duty ratio
RBIAS = 2.4 kΩ, VCOIN = 1/2 VDD,
See Note 7
α(fosc)
Temperature coefficient of oscillation frequency
VCOIN = 1/2 VDD, RBIAS = 2.4 kΩ,
TA = –20°C to 85°C
0.07
%/°C
kSVS(fosc)
Supply voltage coefficient of oscillation frequency
VCOIN = 1.5 V, RBIAS = 2.4 kΩ,
VDD = 2.7 V to 3.3 V
0.01
%/mV
0.3
10
32
40%
V
MΩ
6
10
mA
40
48
MHz
44%
60%
NOTES: 6. VCOIN = 1/2 VDD, RBIAS = 2.4 kΩ, current through pin 1 and 8.
7. The maximum and minimum value of this parameter are not production tested.
electrical characteristics over recommended operating free-air temperature range, VDD = 5 V
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
High-level output voltage, VCO OUT
Low-level output voltage, VCO OUT
IOH = – 2 mA
IOL = 2 mA
Zi(VCOIN)
IDD(VCO)
Input impedance at VCOIN
VCOIN = 1/2 VDD
Supply current
See Note 6
fosc
Oscillation frequency
RBIAS = 2.4 kΩ, VCOIN = 1/2 VDD
tr
Output rise time
VCOIN = 0 V, RBIAS =2.4 kΩ ,
CL = 15 pF
5.8
ns
tf
Output fall time
VCOIN = 0 V, RBIAS =2.4 kΩ ,
CL = 15 pF
3.2
ns
Output duty ratio
RBIAS = 2.4 kΩ, VCOIN = 1/2 VDD,
See Note 7
α(fosc)
Temperature coefficient of oscillation frequency
VCOIN = 1/2 VDD, RBIAS = 2.4 kΩ,
TA = –20°C to 85°C
kSVS(fosc)
Supply voltage coefficient of oscillation frequency
VCOIN = 2.5 V, RBIAS = 2.4 kΩ,
VDD = 4.5 V to 5.5 V
NOTES: 6. VCOIN = 1/2 VDD, RBIAS = 2.4 kΩ, current through pin 1 and 8.
7. The maximum and minimum value of this parameter are not production tested.
4
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4.5
UNIT
VOH
VOL
V
0.5
10
45
40%
V
MΩ
16
30
mA
65
85
MHz
46%
60%
0.06
%/°C
0.005
%/mV
TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
PARAMETER MEASUREMENT INFORMATION
90%
90%
10%
10%
VCO OUT
tr
tf
VCO Output Waveform
Figure 2. VCO Output Waveform
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TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
TYPICAL CHARACTERISTICS
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
80
VDD = 3 V
RBIAS = 1.5 kΩ
80
–25°C
25°C
70
60
50
85°C
40
30
20
VCO Oscillation Frequency – MHz
VCO Oscillation Frequency – MHz
90
VDD = 3 V
RBIAS = 1.8kΩ
70
– 25°C
60
25°C
50
85°C
40
30
20
10
10
0
0
0
0.6
1.2
1.8
2.4
VCO Control Voltage – V
3.0
0
0.6
Figure 3
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
70
70
VDD = 3 V
RBIAS = 2.2 kΩ
60
– 25°C
VCO Oscillation Frequency – MHz
VCO Oscillation Frequency – MHz
3.0
Figure 4
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
25°C
50
85°C
40
30
20
VDD = 3V
RBIAS = 2.7 kΩ
60
25°C
50
40
85°C
30
20
– 25°C
10
10
0
0
0.6
2.4
1.2
1.8
VCO Control Voltage – V
3.0
0
0
Figure 5
6
1.2
1.8
2.4
VCO Control Voltage – V
0.6
1.2
1.8
2.4
VCO Control Voltage – V
Figure 6
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3.0
TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
TYPICAL CHARACTERISTICS
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
140
160
120
VCO Oscillation Frequency – MHz
VCO Oscillation Frequency – MHz
140
–25°C
85°C
100
80
60
40
120
25°C
100
80
85°C
60
40
20
20
0
0
0
1.0
3.0
4.0
2.0
VCO Control Voltage – V
0
5.0
1.0
5.0
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
100
120
25°C
VDD = 5 V
RBIAS = 4.3 kΩ
90
VCO Oscillation Frequency – MHz
VDD = 5 V
RBIAS = 3.3 kΩ
100
80
85°C
60
40
80
70
60
25°C
50
85°C
40
30
20
–25°C
–25°C
20
3.0
4.0
2.0
VCO Control Voltage – V
Figure 8
Figure 7
VCO Oscillation Frequency – MHz
–25°C
VDD = 5 V
RBIAS = 2.4 kΩ
25°C
VDD = 5 V
RBIAS = 1.5 kΩ
10
0
0
0
1.0
2.0
3.0
4.0
VCO Control Voltage – V
5.0
0
1.0
3.0
4.0
2.0
VCO Control Voltage – V
5.0
Figure 10
Figure 9
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TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
MECHANICAL DATA
PW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PIN SHOWN
0,32
0,17
0,65
14
0,13 M
8
0,15 NOM
4,70
4,30
6,70
6,10
Gage Plane
0,25
1
7
0°– 8°
0,70
0,40
A
Seating Plane
1,20 MAX
0,10
0,10 MIN
PINS **
8
14
16
20
24
28
A MAX
3,30
5,30
5,30
6,80
8,10
10,00
A MIN
2,90
4,90
4,90
6,40
7,70
9,60
DIM
4040064 / B 10/94
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
8
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Copyright 1999, Texas Instruments Incorporated