TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Stable Oscillation Using External Resistor
D
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)
D
Operating Free-Air Temperature Range,
TA = –20°C to 85°C
D
8-Pin Thin Shrinked Small-Outline Package
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
TATSSOP
(PW)
–20°C to 85°C TLC2940IPW
functional block diagram
Bias
Circuit Output
Buffer
VCO CONTROL
VCOIN
VCO OUT
BIAS
RESISTOR
VCO OUT VCO
TLC2940
BIAS
VCOIN
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.
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.
1
2
3
4
8
7
6
5
LOGIC VDD
VCO OUT
FREFINPUT
PFD OUT
VCO VDD
BIAS
VCOIN
GND
PW PACKAGE
(TOP VIEW)
TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
{
DESCRIPTION
NAME NO.
I/O
{
DESCRIPTION
BIAS 7 M Bias supply terminal for internal VCO. The resistor should be located between VDD and this terminal.
FREFINPUT 3 I Not used. This terminal should be tied to ground.
GND 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 Frequency Range
Bias Resistor (RBIAS)
VCO Control Voltage (VCOIN)
VCO Oscillation
Figure 1. VCO Oscillation Frequency Range Setting
TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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 af fect 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 MIN NOM MAX UNIT
Su
pp
ly voltage VDD (any su
pp
ly see Notes 3 and 4)
3-V operation 2.85 3 3.15
V
S
u
ppl
y v
oltage
,
V
DD
(an
y
s
u
ppl
y,
see
Notes
3
and
4)
5-V operation 4.75 5 5.25
V
Input voltage, VI (inputs except VCO IN) 0 VDD V
Output current, IO (any output) 0±2 mA
VCO control voltage at VCO IN 1 VDD–0.5 V
RBIAS = 1.5 kΩ42 50
3Vo
p
eration
RBIAS = 1.8 kΩ37 47
3
-
V
operation
RBIAS = 2.2 kΩ33 45
Lock frequency
RBIAS = 2.7 kΩ28 42
MHz
Lock
freq
u
enc
yRBIAS = 1.5 kΩ65 75
MH
z
5Vo
p
eration
RBIAS = 2.4 kΩ50 65
5
-
V
operation
RBIAS = 3.3 kΩ43 56
RBIAS = 4.3 kΩ35 50
VCO oscillation frequency setting resistor RBIAS
3-V operation 1.5 2.7
kΩ
VCO
oscillation
freq
u
enc
y
setting
resistor
,
R
BIAS 5-V operation 1.5 4.3
kΩ
Operating free-air temperature, TA–20 85 °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).
TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range, VDD = 3 V
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VOH High-level output voltage, VCO OUT IOH = –2 mA 2.4 V
VOL Low-level output voltage, VCO OUT IOL = 2 mA 0.3 V
Zi(VCOIN) Input impedance at VCOIN VCO IN = 1/2 VDD 10 MΩ
IDD(VCO) Supply current See Note 6 6 10 mA
fosc Oscillation frequency RBIAS = 2.4 kΩ, VCOIN = 1/2 VDD 32 40 48 MHz
trOutput rise time VCOIN = 0 V, RBIAS =2.4 kΩ ,
CL = 15 pF 13 ns
tfOutput 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 740% 44% 60%
α(fosc) Temperature coefficient of oscillation frequency VCOIN = 1/2 VDD, RBIAS = 2.4 kΩ,
TA = –20°C to 85°C0.07 %/°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
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 UNIT
VOH High-level output voltage, VCO OUT IOH = –2 mA 4.5 V
VOL Low-level output voltage, VCO OUT IOL = 2 mA 0.5 V
Zi(VCOIN) Input impedance at VCOIN VCOIN = 1/2 VDD 10 MΩ
IDD(VCO) Supply current See Note 6 16 30 mA
fosc Oscillation frequency RBIAS = 2.4 kΩ, VCOIN = 1/2 VDD 45 65 85 MHz
trOutput rise time VCOIN = 0 V, RBIAS =2.4 kΩ ,
CL = 15 pF 5.8 ns
tfOutput 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 740% 46% 60%
α(fosc) Temperature coefficient of oscillation frequency VCOIN = 1/2 VDD, RBIAS = 2.4 kΩ,
TA = –20°C to 85°C0.06 %/°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 0.005 %/mV
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.
TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
trtf
90%
10%
90%
10%
VCO OUT
VCO Output Waveform
Figure 2. VCO Output Waveform
TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 3
20
0
90
40
0 1.2 1.8 3.0
70
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VCO Control Voltage – V
25°C
VCO Oscillation Frequency – MHz
10
30
50
60
80
0.6 2.4
–25°C
85°C
VDD = 3 V
RBIAS = 1.5 kΩ
Figure 4
20
10
0 0.6 1.2 1.8
30
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
40
2.4 3.0
0
VCO Control Voltage – V
–25°C
85°C
VCO Oscillation Frequency – MHz
50
60
70
80 VDD = 3 V
RBIAS = 1.8kΩ
25°C
Figure 5
10
0
40
20
0 0.6 1.2 1.8
30
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VCO Control Voltage – V
85°C
25°C
VCO Oscillation Frequency – MHz
50
60
70
2.4 3.0
VDD = 3 V
RBIAS = 2.2 kΩ
–25°C
Figure 6
50
00 0.6 1.2 1.8
70
2.4 3.0
40
60
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VDD = 3V
RBIAS = 2.7 kΩ25°C
85°C
VCO Control Voltage – V
–25°C
VCO Oscillation Frequency – MHz
30
20
10
TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 7
40
0
160
80
0 1.0 2.0 5.0
120
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VCO Control Voltage – V
VCO Oscillation Frequency – MHz
140
100
60
20
3.0 4.0
VDD = 5 V
RBIAS = 1.5 kΩ
–25°C
25°C
85°C
Figure 8
40
0
80
0 1.0 2.0 5.0
140
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VCO Control Voltage – V
VCO Oscillation Frequency – MHz
100
60
20
3.0 4.0
VDD = 5 V
RBIAS = 2.4 kΩ–25°C
25°C
85°C
120
Figure 9
40
0
80
0 1.0 2.0 5.0
120
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VCO Control Voltage – V
VCO Oscillation Frequency – MHz
100
60
20
3.0 4.0
VDD = 5 V
RBIAS = 3.3 kΩ
–25°C
25°C
85°C
Figure 10
30
0
70
0 1.0 2.0 5.0
100
VCO OSCILLATION FREQUENCY
vs
VCO CONTROL VOLTAGE
VCO Control Voltage – V
VCO Oscillation Frequency – MHz
80
50
10
3.0 4.0
–25°C
25°C
85°C
20
40
60
90 VDD = 5 V
RBIAS = 4.3 kΩ
TLC2940
HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR
SLAS244 – OCTOBER 1999
8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
4040064/B 10/94
14 PIN SHOWN
Seating Plane
0,10 MIN
1,20 MAX
1
A
7
14
0,17
4,70
4,30
8
6,10
6,70
0,32
0,70
0,40
0,25
Gage Plane
0,15 NOM
0,65 M
0,13
0°–8°
0,10
PINS **
A MIN
A MAX
DIM
2,90
3,30
8
4,90
5,30
14
6,80
6,404,90
5,30
16
7,70
20
8,10
24
9,60
10,00
28
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.
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
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Copyright 1999, Texas Instruments Incorporated
