THS4001ID [TI]

270-MHz HIGH-SPEED AMPLIFIER; 270 - MHz的高速放大器
THS4001ID
型号: THS4001ID
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

270-MHz HIGH-SPEED AMPLIFIER
270 - MHz的高速放大器

放大器 光电二极管 PC
文件: 总16页 (文件大小:241K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
D PACKAGE  
(TOP VIEW)  
Very High Speed  
– 270 MHz Bandwidth (Gain = 1, 3 dB)  
– 400 V/µsec Slew Rate  
NULL  
IN–  
NULL  
1
2
3
4
8
7
6
5
– 40-ns Settling Time (0.1%)  
V
+
CC  
High Output Drive, I = 100 mA  
O
IN+  
OUT  
NC  
Excellent Video Performance  
– 60 MHz Bandwidth (0.1 dB, G = 1)  
– 0.04% Differential Gain  
V
CC  
NC – No internal connection  
– 0.15° Differential Phase  
Very Low Distortion  
– THD = –72 dBc at f = 1 MHz  
CLOSED-LOOP GAIN  
vs  
Wide Range of Power Supplies  
FREQUENCY  
V
I
= ± 2.5 V to ± 15 V,  
= 7.5 mA  
CC  
CC  
8
6
V
= ±15 V  
CC  
Evaluation Module Available  
Gain = 1  
4
2
0
description  
The THS4001 is a very high-performance,  
voltage-feedback operational amplifier especially  
suited for a wide range of video applications. The  
device is specified to operate over a wide range of  
supply voltages from ± 15 V to ± 2.5 V. With a  
bandwidth of 270 MHz, a slew rate of over  
400 V/µs, and settling times of less than 30 ns, the  
THS4001 offers the unique combination of high  
performance in an easy to use voltage feedback  
configuration over a wide range of power supply  
voltages.  
–2  
–4  
–6  
3.9 pF  
200  
+
–8  
–10  
50 Ω  
–12  
–14  
The THS4001 is stable at all gains for both  
inverting and noninverting configurations. It has a  
high output drive capability of 100 mA and draws  
300k 1M  
10M  
100M  
1G  
3G  
f – Frequency – Hz  
only 7.5 mA of quiescent current. Excellent professional video results can be obtained with the differential  
gain/phase performance of 0.04%/0.15° and 0.1 dB gain flatness to 60 MHz. For applications requiring low  
distortion, the THS4001 is ideally suited with total harmonic distortion of –72 dBc at f = 1 MHz.  
HIGH-SPEED AMPLIFIER FAMILY  
SUPPLY  
VOLTAGE  
THD  
f = 1 MHz  
(dB)  
t
s
0.1%  
(ns)  
ARCH.  
BW  
(MHz)  
SR  
(V/µs)  
DIFF.  
GAIN  
DIFF.  
PHASE  
V
n
(nV/Hz)  
DEVICE  
VFB CFB 5 V ±5 V ±15 V  
THS3001  
420  
270  
100  
180  
6500  
400  
100  
400  
–96  
–72  
–72  
–72  
40  
40  
60  
40  
0.01%  
0.04%  
0.02%  
0.02%  
0.02°  
0.15°  
0.03°  
0.02°  
1.6  
12.5  
1.6  
THS4001  
THS4031/32  
THS4061/62  
14.5  
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.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
AVAILABLE OPTIONS  
PACKAGED DEVICES  
T
A
SMALL OUTLINE  
(D)  
EVALUATION  
MODULE  
0°C to 70°C  
THS4001CD  
THS4001ID  
THS4001EVM  
40°C to 85°C  
The D packages are available taped and reeled. Add an R suffix to the  
device type (i.e., THS4001CDR).  
symbol  
NULL  
NULL  
IN–  
_
V
CC  
+
IN+  
OUT  
NC  
+
V
CC  
absolute maximum ratings over operating free-air temperature (unless otherwise noted)  
Supply voltage, V  
to V  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 V  
CC+  
CC–  
Input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±V  
I
CC  
Output current, I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 mA  
O
Differential input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4 V  
ID  
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Ratings Table  
Operating free air temperature, T :C suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70 °C  
A
I suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40°C to 85 °C  
Storage temperature, T  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150 °C  
stg  
Lead temperature 1,6 mm (1/16 Inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°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.  
DISSIPATION RATING TABLE  
T
25°C  
DERATING FACTOR  
T
= 70°C  
T = 85°C  
A
POWER RATING  
A
A
PACKAGE  
POWER RATING  
ABOVE T = 25°C  
POWER RATING  
A
D
740 mW  
6 mW/°C  
475 mW  
385 mW  
CAUTION: The THS4001 provides ESD protection circuitry. However, permanent damage can still occur if this device is  
subjected to high-energy electrostatic discharges. Proper ESD precautions are recommended to avoid any performance  
degradation or loss of functionality  
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
recommended operating conditions  
MIN  
±2.5  
5
TYP  
MAX  
±16  
32  
UNIT  
Dual supply  
Single supply  
±15 V  
Supply voltage, V  
V
CC  
7.8  
6.7  
9.5  
8
Quiescent current, I  
mA  
CC  
±5 V, ±2.5 V  
C suffix  
0
70  
Operating free-air temperature, T  
°C  
A
I suffix  
40  
85  
electrical characteristics, V  
= ±15 V, R = 150 , T = 25°C (unless otherwise noted)  
CC  
L
A
PARAMETER  
V
MIN  
TYP  
0.04%  
0.01%  
0.15°  
0.08°  
2
MAX  
UNIT  
TEST CONDITIONS  
CC  
±15 V  
±5 V  
±15 V  
±5 V  
Differential gain error  
Differential phase error  
Gain = 2,  
f = 3.58 MHz  
R
= 150 ,  
L
T
= 25°C  
8
10  
5
A
±15 V,  
±5 V  
V
Input offset voltage  
Input bias current  
mV  
IO  
T
A
= full range  
= 25°C  
T
A
2.6  
35  
±15 V,  
±5 V  
I
IB  
µA  
T
A
= full range  
= 25°C  
6
T
A
200  
500  
±15 V,  
±5 V  
I
Input offset current  
Open-loop gain  
nA  
OS  
T
A
= full range  
= ±10 V,  
= 1 kΩ  
V
T
= 25°C  
5
3
10  
6
O
A
±15 V  
±5 V  
R
T
= full range  
= 25°C  
A
L
A
V/mV  
V
= ±2.5 V,  
= 500 Ω  
T
3
O
R
T
A
= full range  
= 25°C  
2
L
T
A
85  
75  
75  
70  
100  
85  
CMRR Common-mode rejection ratio  
V
= ±12 V  
±15 V  
dB  
dB  
(CM)  
T
A
= full range  
T
A
= 25°C  
±15 V,  
±5 V  
PSRR  
Power supply rejection ratio  
T
A
= full range  
13.5  
to  
–13  
14.8  
to  
–14  
±15 V  
±5 V  
V
Common-mode input voltage range  
V
ICR  
O
3.6  
to  
4.4  
to  
2.7  
3.6  
±15 V  
±5 V  
±13  
±3.3  
±0.8  
50  
±13.5  
±3.8  
±1.3  
100  
100  
100  
72  
10  
V
Output voltage swing  
Output current  
R
= 500 Ω  
V
L
±2.5 V  
±15 V  
±5 V  
I
O
50  
mA  
±2.5 V  
±15 V  
50  
THD  
Total harmonic distortion  
Input resistance  
V = 1 V  
I
,
(PP)  
f = 1 MHz  
dBc  
MΩ  
pF  
R
C
R
I
Input capacitance  
Output resistance  
1.5  
I
Open loop  
10  
O
3
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
operating characteristics, V  
= ±15 V, R = 150 , T = 25°C (unless otherwise noted)  
CC  
L
A
PARAMETER  
TEST CONDITIONS  
V
MIN  
TYP  
400  
400  
350  
40  
MAX  
UNIT  
CC  
±15 V  
±5 V  
Slew rate  
Gain = –1  
V/µs  
±2.5 V  
±15 V  
±5 V  
10 V step (0 to 10 V), Gain = –1  
2.5 V to 2.5 V step, Gain = –1  
Settling time to 0.1%  
ns  
30  
±15 V  
±5 V  
270  
220  
180  
80  
Gain = +1,  
R = 150 Ω  
f
R
= 150 ,  
L
MHz  
±2.5 V  
±15 V  
±5 V  
–3 dB Bandwidth  
Gain = –1,  
R = 150 Ω  
f
R
= 150 ,  
L
75  
MHz  
MHz  
±2.5 V  
±15 V  
±5 V  
70  
60  
Bandwidth for 0.1 dB flatness  
Gain = +1  
50  
±2.5 V  
40  
±15 V,  
±5 V  
V
Equivalent input noise voltage  
Equivalent input noise current  
f = 10 kHz  
f = 10 kHz  
12.5  
1.5  
nV/Hz  
pA/Hz  
n
±15 V,  
±5 V  
I
n
TYPICAL CHARACTERISTICS  
Table of Graphs  
FIGURE  
I
Input bias current  
Input offset voltage  
Open-loop gain  
Phase  
vs Free-air temperature  
vs Free-air temperature  
vs Frequency  
1
2
IB  
V
IO  
3
vs Frequency  
3
Differential gain  
Differential phase  
Closed-loop gain  
vs DC voltage  
4, 5  
4, 5  
6, 7  
8
vs DC voltage  
vs Frequency  
CMRR Common-mode rejection ratio  
vs Frequency  
vs Frequency  
9
PSRR  
Power-supply rejection ratio  
vs Free-air temperature  
vs Supply voltage  
vs Load resistance  
vs Feedback resistance  
vs Supply voltage  
vs Free-air temperature  
vs Frequency  
10  
11  
V
Output voltage swing  
Bandwidth (3 dB)  
Supply current  
O(PP)  
12  
13, 14  
15  
16  
17  
18  
I
CC  
E
nv  
THD  
Noise spectral density  
Total harmonic distortion  
vs Frequency  
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
TYPICAL CHARACTERISTICS  
INPUT BIAS CURRENT  
vs  
INPUT OFFSET VOLTAGE  
vs  
FREE-AIR TEMPERATURE  
FREE-AIR TEMPERATURE  
3
2.75  
2.5  
1.5  
1
0.5  
0
V
CC  
= ±15 V  
V
CC  
= ±15 V  
2.25  
V
CC  
= ±5 V  
V
CC  
= ±5 V  
0.5  
–1  
2
1.75  
1.5  
V
= ±2.5 V  
CC  
1.5  
–40  
–20  
0
20  
40  
60  
80  
100  
–40  
–20  
0
20  
40  
60  
80  
100  
T
A
– Free-Air Temperature – °C  
T
A
– Free-Air Temperature – °C  
Figure 1  
Figure 2  
OPEN-LOOP GAIN AND PHASE  
vs  
FREQUENCY  
90  
80  
V
CC  
= ±15 V  
70  
60  
50  
0°  
40  
30  
20  
45°  
90°  
10  
0
135  
°
–10  
–20  
180  
1G  
1k  
10k  
100k  
1M  
10M  
100M  
5°  
f – Frequency – Hz  
Figure 3  
5
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
TYPICAL CHARACTERISTICS  
DIFFERENTIAL GAIN AND  
DIFFERENTIAL PHASE  
vs  
DC VOLTAGE  
0.048  
0.1°  
V
CC  
= ±5  
0.08°  
0.06°  
0.036  
0.024  
Phase  
0.012  
0
0.04°  
0.02°  
0°  
–0.012  
–0.024  
–0.036  
Gain  
–0.02°  
–0.04°  
–0.06°  
–0.048  
0
0.1  
0.2  
0.3  
0.4  
0.5  
0.6  
0.7  
DC Voltage – V  
Figure 4  
DIFFERENTIAL GAIN AND  
DIFFERENTIAL PHASE  
vs  
DC VOLTAGE  
0.048  
0.036  
0.024  
0.012  
0
0.12°  
0.1°  
Phase  
V
CC  
= ±15  
0.08°  
0.06°  
Gain  
0.04°  
0.02°  
0°  
–0.012  
–0.024  
–0.036  
–0.02°  
–0.04°  
–0.06°  
–0.048  
–0.06  
0
0.1  
0.2  
0.3  
0.4  
0.5  
0.6  
0.7  
DC Voltage – V  
Figure 5  
6
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
TYPICAL CHARACTERISTICS  
CLOSED-LOOP GAIN  
vs  
CLOSED-LOOP GAIN  
vs  
FREQUENCY  
FREQUENCY  
8
6
5
0
V
= ±15 V  
CC  
Gain = 1  
V
= ±15 V  
CC  
4
2
0
–5  
Gain = –1  
–10  
–15  
20  
25  
–2  
–4  
–6  
3.9 pF  
200 Ω  
1 kΩ  
30  
35  
+
–8  
1 kΩ  
50 Ω  
+
–10  
50 Ω  
40  
45  
–12  
–14  
300k 1M  
10M  
100M  
1G  
3G  
300k 1M  
10M  
100M  
1G  
3G  
f – Frequency – Hz  
f – Frequency – Hz  
Figure 6  
Figure 7  
COMMON-MODE REJECTION RATIO  
POWER SUPPLY REJECTION RATIO  
vs  
vs  
FREQUENCY  
FREQUENCY  
120  
100  
80  
100  
90  
V
CC  
= ±15 V to ±2.5 V  
–V  
CC  
80  
70  
60  
50  
+V  
CC  
60  
40  
30  
20  
40  
20  
0
10  
0
V
CC  
= ±15 V to ±2.5 V  
10  
100  
1k  
10k 100k 1M  
10M 100M  
10  
100  
1k  
10k 100k  
1M  
10M 100M  
f – Frequency – Hz  
f – Frequency – Hz  
Figure 8  
Figure 9  
7
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
TYPICAL CHARACTERISTICS  
POWER SUPPLY REJECTION RATIO  
OUTPUT VOLTAGE SWING  
vs  
vs  
FREE-AIR TEMPERATURE  
SUPPLY VOLTAGE  
120  
110  
100  
90  
30  
25  
20  
15  
R
= 1 kΩ  
L
V
CC  
= –15 V  
R
= 150 Ω  
L
V
CC  
= 15 V  
80  
10  
5
70  
60  
0
–40  
–20  
0
20  
40  
60  
80  
100  
2
4
6
8
10  
12  
14  
16  
T
A
– Free-Air Temperature – °C  
V
CC  
– Supply Voltage – V  
Figure 10  
Figure 11  
OUTPUT VOLTAGE SWING  
vs  
BANDWIDTH (–3 dB)  
vs  
FEEDBACK RESISTANCE  
LOAD RESISTANCE  
30  
25  
20  
15  
100  
90  
V
= ±15 V  
CC  
V
CC  
= ±15 V  
80  
70  
60  
50  
V
CC  
= ±5 V  
V
= ±2.5 V  
CC  
40  
30  
20  
V
= ±5 V  
CC  
10  
5
V
= ±2.5 V  
CC  
Gain = –1  
f = –3 dB  
10  
0
R
= 150 Ω  
L
0
10  
100  
1000  
10000  
500  
700  
900 1100 1300 1500 1700 1900  
R
– Load Resistance – Ω  
L
R
– Feedback Resistance – Ω  
(FB)  
Figure 12  
Figure 13  
8
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
TYPICAL CHARACTERISTICS  
BANDWIDTH (–3 dB)  
vs  
FEEDBACK RESISTANCE  
SUPPLY CURRENT  
vs  
SUPPLY VOLTAGE  
300  
250  
200  
9
Gain = 1  
f = –3 dB  
= 150 Ω  
8
7
6
5
4
3
2
V
= ±15 V  
CC  
R
L
150  
100  
V
= ±5 V  
CC  
V
CC  
= ±2.5 V  
50  
0
1
0
100 200 300 400 500 600 700 800 900 1000  
2
4
6
8
10  
12  
14  
R
– Feedback Resistance – Ω  
(FB)  
V
CC  
– Supply Voltage – V  
Figure 14  
Figure 15  
SUPPLY CURRENT  
vs  
NOISE SPECTRAL DENSITY  
vs  
FREE-AIR TEMPERATURE  
FREQUENCY  
9
8
7
80  
70  
60  
50  
40  
30  
20  
10  
0
V
= ±15 V  
CC  
6
5
4
3
2
V
CC  
= ±5 V  
V
= ±2.5 V  
CC  
V
CC  
= ±15 V  
V
= ±5 V  
CC  
1
0
and ±2.5 V  
–40  
–20  
0
20  
40  
60  
80  
100  
10  
100  
1k  
10k  
100k  
T
A
– Free-Air Temperature – °C  
f – Frequency – Hz  
Figure 16  
Figure 17  
9
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
TYPICAL CHARACTERISTICS  
TOTAL HARMONIC DISTORTION  
vs  
FREQUENCY  
–50  
–55  
–60  
–65  
–70  
–75  
G = +2  
V
V
= 1 V(  
PP)  
CC  
IN  
= ±15 V  
= 150 Ω  
R
3 rd Harmonic  
L
2 nd Harmonic  
–80  
–85  
0.5  
1
10  
f – Frequency – MHz  
Figure 18  
10  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
APPLICATION INFORMATION  
theory of operation  
The THS4001 is a high speed, operational amplifier configured in a voltage feedback architecture. It is built  
using a 30-V, dielectrically isolated, complementary bipolar process with NPN and PNP transistors possessing  
f s of several GHz. This results in an exceptionally high performance amplifier that has a wide bandwidth, high  
T
slew rate, fast settling time, and low distortion. A simplified schematic is shown in Figure 19.  
(7) V  
+
CC  
(6) OUT  
IN(2)  
IN+ (3)  
(4) V  
CC  
NULL (1)  
NULL (8)  
Figure 19. THS4001 Simplified Schematic  
11  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
APPLICATION INFORMATION  
offset nulling  
The THS4001 has very low input offset voltage for a high-speed amplifier. However, if additional correction is  
required, an offset nulling function has been provided. By placing a potentiometer between terminals 1 and 8  
of the device and tying the wiper to the negative supply, the input offset can be adjusted. This is shown in  
Figure 20.  
V
CC  
+
0.1 µF  
+
_
THS4001  
10 kΩ  
0.1 µF  
V
CC  
Figure 20. Offset Nulling Schematic  
optimizing unity gain response  
Internal frequency compensation of the THS4001 was selected to provide very wideband performance yet still  
maintain stability when operated in a noninverting unity gain configuration. When amplifiers are compensated  
in this manner there is usually peaking in the closed loop response and some ringing in the step response for  
very fast input edges, depending upon the application. This is because a minimum phase margin is maintained  
fortheG=+1configuration. Foroptimumsettlingtimeandminimumringing, afeedback resistorof 200should  
be used as shown in Figure 21. Additional capacitance can also be used in parallel with the feedback resistance  
if even finer optimization is required.  
Input  
+
Output  
THS4001  
_
200 Ω  
Figure 21. Noninverting, Unity Gain Schematic  
12  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
APPLICATION INFORMATION  
driving a capacitive load  
Driving capacitive loads with high performance amplifiers is not a problem as long as certain precautions are  
taken. The first is to realize that the THS4001 has been internally compensated to maximize its bandwidth and  
slew rate performance. When the amplifier is compensated in this manner, capacitive loading directly on the  
output will decrease the device’s phase margin leading to high frequency ringing or oscillations. Therefore, for  
capacitive loads of greater than 10 pF, it is recommended that a resistor be placed in series with the output of  
the amplifier, as shown in Figure 22. A minimum value of 20 should work well for most applications. For  
example, in 75-transmission systems, setting the series resistor value to 75 both isolates any capacitance  
loading and provides the proper line impedance matching at the source end.  
1 kΩ  
1 kΩ  
_
Input  
20 Ω  
Output  
LOAD  
THS4001  
+
C
Figure 22. Driving a Capacitive Load  
circuit layout considerations  
In order to achieve the levels of high frequency performance of the THS4001, it is essential that proper  
printed-circuit board high frequency design techniques be followed. A general set of guidelines is given below.  
In addition, a THS4001 evaluation board is available to use as a guide for layout or for evaluating the device  
performance.  
Ground planes – It is highly recommended that a ground plane be used on the board to provide all  
components with a low inductive ground connection. However, in the areas of the amplifier inputs and  
output, the ground plane can be removed to minimize the stray capacitance.  
Proper power supply decoupling – Use a 6.8-µF tantalum capacitor in parallel with a 0.1-µF ceramic  
capacitor on each supply terminal. It may be possible to share the tantalum among several amplifiers  
depending on the application, but a 0.1-µF ceramic capacitor should always be used on the supply terminal  
of every amplifier. In addition, the 0.1-µF capacitor should be placed as close as possible to the supply  
terminal. As this distance increases, the inductance in the connecting trace makes the capacitor less  
effective. The designer should strive for distances of less than 0.1 inches between the device power  
terminals and the ceramic capacitors.  
Sockets – Sockets are not recommended for high speed op amps. The additional lead inductance in the  
socket pins will often lead to stability problems. Surface-mount packages soldered directly to the  
printed-circuit board is the best implementation.  
Short trace runs/compact part placements – Optimum high frequency performance is achieved when stray  
series inductance has been minimized. To realize this, the circuit layout should be made as compact as  
possible thereby minimizing the length of all trace runs. Particular attention should be paid to the inverting  
input of the amplifier. Its length should be kept as short as possible. This will help to minimize stray  
capacitance at the input of the amplifier.  
13  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
APPLICATION INFORMATION  
circuit layout considerations (continued)  
Surface-mount passive components – Using surface mount passive components is recommended for high  
frequency amplifier circuits for several reasons. First, because of the extremely low lead inductance of  
surface-mountcomponents, theproblemwithstrayseriesinductanceisgreatlyreduced. Second, thesmall  
size of surface-mount components naturally leads to a more compact layout thereby minimizing both stray  
inductance and capacitance. If leaded components are used, it is recommended that the lead lengths be  
kept as short as possible.  
evaluation board  
An evaluation board is available for the THS4001 (literature number SLOP119). This board has been configured  
for very low parasitic capacitance in order to realize the full performance of the amplifier. A schematic of the  
evaluation board is shown in Figure 23. The circuitry has been designed so that the amplifier may be used in  
either an inverting or noninverting configuration. To order the evaluation board contact your local TI sales office  
or distributor. For more detailed information, refer to the THS4001 EVM User’s Manual (literature number  
SLOU017).  
V
CC  
+
+
C1  
C2  
6.8 µF  
0.1 µF  
R1  
1 kΩ  
NULL  
R2  
49.9 Ω  
IN+  
+
_
R3  
49.9 Ω  
OUT  
THS4001  
NULL  
R5  
C3  
1 kΩ  
6.8 µF  
+
C4  
0.1 µF  
IN–  
V
CC  
R4  
49.9 Ω  
Figure 23.  
14  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
THS4001  
270-MHz HIGH-SPEED AMPLIFIER  
SLOS206A– DECEMBER 1997 – REVISED MARCH 1999  
MECHANICAL INFORMATION  
D (R-PDSO-G**)  
PLASTIC SMALL-OUTLINE PACKAGE  
14 PIN SHOWN  
PINS **  
0.050 (1,27)  
8
14  
16  
DIM  
0.020 (0,51)  
0.014 (0,35)  
0.010 (0,25)  
0.197  
(5,00)  
0.344  
(8,75)  
0.394  
(10,00)  
M
A MAX  
14  
8
0.189  
(4,80)  
0.337  
(8,55)  
0.386  
(9,80)  
A MIN  
0.244 (6,20)  
0.228 (5,80)  
0.008 (0,20) NOM  
0.157 (4,00)  
0.150 (3,81)  
Gage Plane  
1
7
A
0.010 (0,25)  
0°8°  
0.044 (1,12)  
0.016 (0,40)  
Seating Plane  
0.004 (0,10)  
0.010 (0,25)  
0.004 (0,10)  
0.069 (1,75) MAX  
4040047/D 10/96  
NOTES: A. All linear dimensions are in inches (millimeters).  
B. This drawing is subject to change without notice.  
C. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).  
D. Falls within JEDEC MS-012  
15  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
IMPORTANT NOTICE  
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue  
any product or service without notice, and advise customers to obtain the latest version of relevant information  
to verify, before placing orders, that information being relied on is current and complete. All products are sold  
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those  
pertaining to warranty, patent infringement, and limitation of liability.  
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in  
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent  
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily  
performed, except those mandated by government requirements.  
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF  
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL  
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR  
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER  
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO  
BE FULLY AT THE CUSTOMER’S RISK.  
In order to minimize risks associated with the customer’s applications, adequate design and operating  
safeguards must be provided by the customer to minimize inherent or procedural hazards.  
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent  
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other  
intellectual property right of TI covering or relating to any combination, machine, or process in which such  
semiconductor products or services might be or are used. TI’s publication of information regarding any third  
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.  
Copyright 1999, Texas Instruments Incorporated  

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