TI THS4041CDGNR

THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
D
D
D
D
D
D
D
D
THS4041
D AND DGN PACKAGE
(TOP VIEW)
C-Stable Amplifiers Drive Any Capacitive
Load
High Speed
– 165 MHz Bandwidth (–3 dB); CL = 0 pF
– 100 MHz Bandwidth (–3 dB); CL = 100 pF
– 35 MHz Bandwidth (–3 dB); CL = 1000 pF
– 400 V/µs Slew Rate
Unity Gain Stable
High Output Drive, IO = 100 mA (typ)
Very Low Distortion
– THD = –75 dBc (f = 1 MHz, RL = 150 Ω)
– THD = –89 dBc (f = 1 MHz, RL = 1 kΩ)
Wide Range of Power Supplies
– VCC = ±5 V to ±15 V
Available in Standard SOIC or MSOP
PowerPAD Package
Evaluation Module Available
NULL
IN –
IN +
VCC–
RELATED DEVICES
RELATED DEVICES
DEVICE
DESCRIPTION
THS4011/2
290-MHz Low Distortion High-Speed Amplifier
THS4031/2
100-MHz Low Noise High-Speed Amplifier
THS4081/2
175-MHz Low Power High-Speed Amplifiers
8
2
7
3
6
4
5
NULL
VCC+
OUT
NC
NC – No internal connection
THS4042
D AND DGN PACKAGE
(TOP VIEW)
1OUT
1IN –
1IN +
VCC–
description
1
8
2
7
3
6
4
5
VCC+
2OUT
2IN –
2IN+
Cross Section View Showing
PowerPAD Option (DGN)
OUTPUT AMPLITUDE
vs
FREQUENCY
10
8
CL = 1000 pF
CL = 0.1 µF
CL = 0 pF
CL = 100 pF
6
Output Amplitude – dB
The THS4041 and THS4042 are single/dual,
high-speed voltage feedback amplifiers capable
of driving any capacitive load. This makes them
ideal for a wide range of applications including
driving video lines or buffering ADCs. The devices
feature high 165-MHz bandwidth and 400-V/µsec
slew rate. The THS4041/2 are stable at all gains
for both inverting and noninverting configurations.
For video applications, the THS4041/2 offer
excellent video performance with 0.01% differential gain error and 0.01° differential phase error.
These amplifiers can drive up to 100 mA into a
20-Ω load and operate off power supplies ranging
from ±5V to ±15V.
1
4
2
0
–2
VCC = ±15 V
Gain = 1
–6 RF = 200 Ω
RL = 150 Ω
–8
VO(PP)=62 mV
–10
100k
1M
10M
100M
f – Frequency – Hz
–4
1G
CAUTION: The THS4041 and THS4042 provide 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.
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.
PowerPAD is a trademark of Texas Insruments Incorporated.
Copyright  2000, 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
AVAILABLE OPTIONS
PACKAGED DEVICES
TA
NUMBER OF
CHANNELS
PLASTIC
SMALL OUTLINE†
(D)
PLASTIC
MSOP†
(DGN)
MSOP
SYMBOL
EVALUATION
MODULE
1
THS4041CD
THS4041CDGN
ACO
THS4041EVM
2
THS4042CD
THS4042CDGN
ACC
THS4042EVM
1
THS4041D
THS4041IDGN
ACP
—
2
THS4042ID
THS4042IDGN
ACD
—
0°C to 70°C
– 40°C to 85°C
† The D and DGN packages are available taped and reeled. Add an R suffix to the device type (i.e., THS4041CDGNR).
functional block diagram
VCC
8
Null
1IN–
IN–
IN+
2
1
1IN+
8
6
3
2
1
3
1OUT
OUT
2IN–
6
2IN+
5
7
Figure 2. THS4041 – Single Channel
2OUT
4
VCC–
Figure 1. THS4042 – Dual Channel
absolute maximum ratings over operating free-air temperature (unless otherwise noted)†
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±16.5 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VCC
Output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mA
Differential input voltage, VIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Maximum junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
Operating free-air temperature, TA: C-suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
I-suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 85°C
Storage temperature, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
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.
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
DISSIPATION RATING TABLE
PACKAGE
θJA
(°C/W)
θJC
(°C/W)
TA = 25°C
POWER RATING
D
167†
38.3
740 mW
DGN‡
58.4
4.7
2.14 W
† This data was taken using the JEDEC standard Low-K test PCB. For the JEDEC proposed
High-K test PCB, the θJA is 95°C/W with a power rating at TA = 25°C of 1.32 W.
‡ This data was taken using 2 oz. trace and copper pad that is soldered directly to a 3 in. × 3 in.
PC. For further information, refer to Application Information section of this data sheet.
recommended operating conditions
MIN
Supply voltage
voltage, VCC+
CC and VCC–
CC
Operating free-air
free air temperature,
temperature TA
NOM
MAX
±4.5
±16
Single supply
9
32
C-suffix
0
70
–40
85
Dual supply
I-suffix
UNIT
V
°C
electrical characteristics at TA = 25°C, VCC = ±15 V, RL = 150 Ω (unless otherwise noted)
dynamic performance
TEST CONDITIONS†
PARAMETER
TYP
VCC = ±15 V
VCC = ±5 V
Rf = 200 Ω
VCC = ±15 V
VCC = ±5 V
Rf = 1.3 kΩ
Bandwidth for 0.1
0 1 dB flatness
VCC = ±15 V
VCC = ±5 V
Rf = 200 Ω
F ll power
po er bandwidth
band idth§
Full
VO(pp) = 20 V,
VO(pp) = 5 V,
VCC = ±15 V
VCC = ±5 V
Sle rate‡
Slew
VCC = ±15 V,
VCC = ±5 V,
20-V step,
Gain = 5
400
5-V step,
Gain = –1
325
Settling time to 0.1%
0 1%
VCC = ±15 V,
VCC = ±5 V,
5-V step
Settling time to 0.01%
0 01%
VCC = ±15 V,
VCC = ±5 V,
5-V step
Dynamic
performance small-signal
bandwidth
y
g
(–3 dB)
BW
SR
MIN
ts
Rf = 200 Ω
Rf = 1.3 kΩ
Rf = 200 Ω
2-V step
2-V step
Gain = 1
Gain = 2
Gain = 1
165
150
60
60
45
45
6.3
20
Gain = –1
1
Gain = –1
1
120
120
250
280
MAX
UNIT
MHz
MHz
MHz
MHz
V/µs
ns
ns
† Full range = 0°C to 70°C for C suffix and – 40°C to 85°C for I suffix
‡ Slew rate is measured from an output level range of 25% to 75%.
§ Full power bandwidth = slew rate / 2 π VO(Peak).
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
electrical characteristics at TA = 25°C, VCC = ±15 V, RL = 150 Ω (unless otherwise noted) (continued)
noise/distortion performance
TEST CONDITIONS†
PARAMETER
THD
Vn
In
Total harmonic distortion
Input voltage noise
Input current noise
Differential gain error
VO(
O(pp)) = 2 V,,
f = 1 MHz, Gain = 2
VCC = ±5 V or ±15 V,
VCC = ±5 V or ±15 V,
Gain = 2,,
40 IRE modulation,
MIN
VCC = ±15 V
VCC = ±5 V
TYP
RL = 150 Ω
–75
RL = 1 kΩ
–89
RL = 150 Ω
–75
RL = 1 kΩ
–86
f = 10 kHz
f = 10 kHz
0.9
pA/√Hz
NTSC,,
±100 IRE ramp
VCC = ±15 V
VCC = ±5 V
0.01°
NTSC,,
±100 IRE ramp
Channel-to-channel crosstalk
(THS4042 only)
VCC = ±5 V or ±15 V,
f = 1 MHz
dBc
nV/√Hz
0.01%
Gain = 2,,
40 IRE modulation,
UNIT
14
VCC = ±15 V
VCC = ±5 V
Differential phase error
MAX
0.01%
0.02°
Gain = 2
–64
dB
† Full range = 0°C to 70°C for C suffix and – 40°C to 85°C for I suffix
dc performance
TEST CONDITIONS†
PARAMETER
Open loop gain
VCC = ±15 V,,
RL = 1 k Ω
VO = ±10 V,,
VCC = ±5 V,,
RL = 250 Ω
VO = ±2.5 V,,
Input offset voltage
VCC = ±5 V or ±15 V
Offset voltage drift
VCC = ±5 V or ±15 V
IIB
Input bias current
VCC = ±5 V or ±15 V
IOS
Input offset current
VCC = ±5 V or ±15 V
VOS
MIN
TYP
TA = 25°C
TA = full range
74
80
TA = 25°C
TA = full range
69
MAX
69
UNIT
dB
76
66
TA = 25°C
TA = full range
2.5
TA = full range
TA = 25°C
10
10
13
2.5
TA = full range
TA = 25°C
µV/°C
6
8
35
TA = full range
250
400
Offset current drift
TA = full range
† Full range = 0°C to 70°C for C suffix and – 40°C to 85°C for I suffix
mV
0.3
µA
nA
nA/°C
input characteristics
TEST CONDITIONS†
PARAMETER
VICR
Common mode input voltage range
Common-mode
VCC = ±15 V
VCC = ±5 V
CMRR
Common mode rejection ratio
VCC = ±15 V,
VCC = ±5 V,
ri
Input resistance
VICR = ±12 V
VICR = ±2.5 V
Ci
Input capacitance
† Full range = 0°C to 70°C for C suffix and – 40°C to 85°C for I suffix
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TA = full range
MIN
TYP
±13.8
±14.3
± 3.8
± 4.3
70
90
80
100
MAX
UNIT
V
dB
1
MΩ
1.5
pF
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
electrical characteristics at TA = 25°C, VCC = ±15 V, RL = 150 Ω (unless otherwise noted) (continued)
output characteristics
TEST CONDITIONS†
PARAMETER
VO
IO
Output voltage swing
O tp t current
Output
c rrent‡
VCC = ±15 V
VCC = ±5 V
MIN
TYP
RL = 250 Ω
±11.5
±13
RL = 150 Ω
±3.2
±3.5
VCC = ±15 V
VCC = ±5 V
RL = 1 kΩ
VCC = ±15 V
VCC = ±5 V
RL = 20 Ω
±13
±13.6
±3.5
±3.8
80
100
50
65
MAX
UNIT
V
V
mA
ISC
Short-circuit current‡
VCC = ±15 V
150
mA
RO
Output resistance
Open loop
13
Ω
† Full range = 0°C to 70°C for C suffix and – 40°C to 85°C for I suffix
‡ Observe power dissipation ratings to keep the junction temperature below the absolute maximum rating when the output is heavily loaded or
shorted. See the absolute maximum ratings section of this data sheet for more information.
power supply
TEST CONDITIONS†
PARAMETER
VCC
ICC
PSRR
Supply voltage operating range
Single supply
TYP
MAX
±4.5
±16.5
9
33
VCC = ±15 V
TA = 25°C
TA = full range
8
VCC = ±5 V
TA = 25°C
TA = full range
7
VCC = ±5 V or ±15 V
TA = 25°C
TA = full range
Supply current (per amplifier)
Power supply rejection ratio
MIN
Dual supply
UNIT
V
9.5
11
8.5
mA
10
75
70
84
dB
† Full range = 0°C to 70°C for C suffix and – 40°C to 85°C for I suffix
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
TYPICAL CHARACTERISTICS
2
0
VCC = ±15 V and ±5 V
–60
60
–90
40
Phase
–120
20
Output Amplitude – dB
Gain
RL = 1 kΩ
Phase – Degrees
Open Loop Gain – dB
0.3
1
–30
80
–150
0
–20
1k
10k
100k
1M
10M
f – Frequency – Hz
100M
0
–2
–3
–4
–5
–6
100k
–180
1G
CL = 0 pF
CL = 100 pF
1M
10M
100M
f – Frequency – Hz
Output Amplitude – dB
2
0
–2
VCC = ±15 V
Gain = 1
–6 RF = 200 Ω
RL = 150 Ω
–8
VO(PP)=62 mV
–10
100k
1M
10M
100M
f – Frequency – Hz
–4
4
–4
–8
–10
100k
1G
1
CL = 0.01 µF
CL = 10 pF
VCC = ±15 V
Gain = 1
RF = 200 Ω
RL = 150 Ω
VO(PP)=62 mV
100M
1M
10M
f – Frequency – Hz
–4
OUTPUT AMPLITUDE
vs
FREQUENCY
8
0.1
–0.0
RL = 150 Ω
VCC = ±5 V
Gain = 1
RF = 200 Ω
VO = 0.2 Vrms
CL = 0 pF
CL = 100 pF
1G
6
0
–2
–8
–10
100k
1G
8
2
–6
100M
1M
10M
f – Frequency – Hz
10
CL = 1000 pF
CL = 0.1 µF
4
–4
VCC = ±5 V
Gain = 1
RF = 200 Ω
VO = 0.2 Vrms
OUTPUT AMPLITUDE
vs
FREQUENCY
Output Amplitude – dB
Output Amplitude – dB
0.2
Figure 9
–3
Figure 8
10
1M
10M
100M
f – Frequency – Hz
–2
–6
100k
1G
RL = 150 Ω
–1
–5
6
Output Amplitude – dB
RL = 1 kΩ
0
Figure 7
RL = 1 kΩ
1G
2
0
–6
0.4
6
1M
10M
100M
f - Frequency - Hz
OUTPUT AMPLITUDE
vs
FREQUENCY
–2
OUTPUT AMPLITUDE
vs
FREQUENCY
–0.4
100k
RL = 150 Ω
VCC = ±15 V
Gain = 1
RF = 200 Ω
VO = 0.2 Vrms
Figure 5
2
Figure 6
–0.3
–0.2
6
4
–0.2
–0.1
–0.4
100k
1G
8
6
–0.1
–0.0
–0.3
10
CL = 1000 pF
CL = 0.1 µF
0.1
OUTPUT AMPLITUDE
vs
FREQUENCY
10
0.3
VCC = ±15 V
Gain = 1
RF = 200 Ω
VO = 0.2 Vrms
RL = 1 kΩ
0.2
Figure 4
OUTPUT AMPLITUDE
vs
FREQUENCY
8
RL = 150 Ω
–1
Figure 3
Output Amplitude – dB
0.4
Output Amplitude – dB
100
OUTPUT AMPLITUDE
vs
FREQUENCY
OUTPUT AMPLITUDE
vs
FREQUENCY
Output Amplitude – dB
OPEN LOOP GAIN AND
PHASE RESPONSE
vs
FREQUENCY
VCC = ±5 V
Gain = 1
RF = 200 Ω
RL = 150 Ω
VO(PP)=62 mV
Figure 10
• DALLAS, TEXAS 75265
CL = 10 pF
0
–2
–4
–8
1G
CL = 0.01 µF
2
–6
100M
1M
10M
f – Frequency – Hz
POST OFFICE BOX 655303
4
–10
100k
VCC = ±5 V
Gain = 1
RF = 200 Ω
RL = 150 Ω
VO(PP)=62 mV
100M
1M
10M
f – Frequency – Hz
Figure 11
1G
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
TYPICAL CHARACTERISTICS
OUTPUT AMPLITUDE
vs
FREQUENCY
OUTPUT AMPLITUDE
vs
FREQUENCY
16
7
14
6
RL = 150 Ω
4
3
1
0
100k
VCC = ±15 V
Gain = 2
RF = 1.3 kΩ
VO = 0.4 Vrms
8
CL = 10 pF
6
4
2
0
–2
1M
10M
f – Frequency – Hz
VCC = ±15 V
Gain = 2
–4
100k
100M
16
1
14
0
RL = 150 Ω
–2
–3
VCC = ±5 V
Gain = 2
RF = 1.3 kΩ
VO = 0.4 Vrms
1M
10M
f – Frequency – Hz
10
8
100M
4
2
–4
100k
1G
RL = 1 kΩ
CL = 0.1 µF
0
RL = 150 Ω
–2
–3
VCC = ±15 V
Gain = –1
RF = 2 kΩ
VO = 0.2 Vrms
1M
10M
f – Frequency – Hz
4
2
8
6
0
CL = 10 pF
–4
–6
100M
1G
Figure 19
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
CL = 100 pF
2
0
–2
–4
–8
100M
1M
10M
f – Frequency – Hz
CL = 0.01 µF
4
–6
–8
–10
100k
1G
10
CL = 1000 pF
–2
100M
1M
10M
f – Frequency – Hz
OUTPUT AMPLITUDE
vs
FREQUENCY
VCC = ±15 V
Gain = –1
RF = 2 kΩ
RL = 150 Ω
VO(PP)=62 mV
6
VCC = ±5 V
Gain = 2
RF = 1.3 kΩ
RL = 150 Ω
VO(PP) = 125 mV
Figure 17
OUTPUT AMPLITUDE
vs
FREQUENCY
1
Figure 18
6
–2
100M
1M
10M
f – Frequency – Hz
CL = 100 pF
8
Figure 16
Output Amplitude – dB
Output Amplitude – dB
CL = 10 pF
CL = 0.01 µF
10
–2
8
–6
100k
12
0
10
–5
14
0
2
1G
16
2
–4
100k
1M
10M
100M
f – Frequency – Hz
OUTPUT AMPLITUDE
vs
FREQUENCY
CL = 1000 pF
4
OUTPUT AMPLITUDE
vs
FREQUENCY
–4
VCC = ±15 V
Gain = 2
RF = 1.3 kΩ
RL = 150 Ω
VO(PP) = 125 mV
Figure 14
6
Figure 15
–1
2
–4
100k
1G
VCC = ±5 V
Gain = 2
RF = 1.3 kΩ
RL = 150 Ω
VO(PP)=125 mV
CL = 0.1 µF
12
Output Amplitude – dB
Output Amplitude – dB
RL = 1 kΩ
–6
100k
4
OUTPUT AMPLITUDE
vs
FREQUENCY
2
–5
6
Figure 13
OUTPUT AMPLITUDE
vs
FREQUENCY
–4
CL = 100 pF
8
–2
1M
10M
100M
f – Frequency – Hz
CL = 0.01 µF
10
0
Figure 12
–1
12
CL = 1000 pF
10
Output Amplitude – dB
2
14
Output Amplitude – dB
5
RF = 1.3 kΩ
RL = 150 Ω
VO(PP) = 125 mV
12
Output Amplitude – dB
Output Amplitude – dB
RL = 1 kΩ
16
CL = 0.1 µF
Output Amplitude – dB
8
OUTPUT AMPLITUDE
vs
FREQUENCY
VCC = ±15 V
Gain = –1
RF = 2 kΩ
RL = 150 Ω
VO(PP)=62 mV
–10
100k
100M
1M
10M
f – Frequency – Hz
1G
Figure 20
7
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
TYPICAL CHARACTERISTICS
1
8
RL = 1 kΩ
RL = 150 Ω
–2
–3
VCC = ±5 V
Gain = –1
RF = 2 kΩ
VO = 0.2 Vrms
4
2
CL = 1000 pF
0
CL = 10 pF
–2
–4
–8
50
100M
1M
10M
f – Frequency – Hz
RF = 200 Ω
30
20
5 V Step
30
20
5 V Step
0
100
1k
1
10k
–80
RL = 1 kΩ
–90
–100
100k
10k
RL = 150 Ω
1M
f – Frequency – Hz
Figure 26
DISTORTION
vs
FREQUENCY
DISTORTION
vs
FREQUENCY
DISTORTION
vs
FREQUENCY
–40
–50
Distortion – dB
–70
–80
3rd Harmonic
1M
10M
f – Frequency – Hz
Figure 27
–50
–60
2nd Harmonic
–70
–80
3rd Harmonic
–90
20M
–100
100k
10M
20M
–40
VCC = ±15 V
Gain = 2
RL = 1 kΩ
VO(pp) = 2 V
Distortion – dB
VCC = ±15 V
Gain = 2
RL = 150 Ω
VO(pp) = 2 V
2nd Harmonic
–100
100k
1k
–70
Figure 25
–60
–90
100
–60
Figure 24
–40
–50
10
–50
VCC = ±15 V
Gain = 2
VO(pp) = 2 V
Capacitive Load – pF
Capacitive Load – pF
Distortion – dB
–40
RL = 150 Ω
0
1G
TOTAL HARMONIC DISTORTION
vs
FREQUENCY
1 V Step
RF = 2 kΩ
10
10
1M
10M
100M
f – Frequency – Hz
Figure 23
VCC = ±15 V & ±5 V
40
10
8
–10
100k
1G
Gain = –1
1 V Step
Output Overshoot – %
Output Overshoot – %
VCC = ±15 V & ±5 V
1
VCC = ±5 V
Gain = –1
RF = 2 kΩ
RL = 150 Ω
VO(PP)=62 mV
–4
OUTPUT OVERSHOOT
vs
CAPACITIVE LOAD
60
40
0
–2
Figure 22
OUTPUT OVERSHOOT
vs
CAPACITIVE LOAD
RL = 150 Ω
CL = 100 pF
2
–8
–10
100k
100M
CL = 0.01 µF
4
–6
Figure 21
Gain = 1
6
–6
1M
10M
f – Frequency – Hz
50
8
THD – Total Harmonic Distortion – dB
–5
–6
100k
VCC = ±5 V
Gain = –1
RF = 2 kΩ
RL = 150 Ω
VO(PP)=62 mV
6
0
–4
10
CL = 0.1 µF
Output Amplitude – dB
10
Output Amplitude – dB
Output Amplitude – dB
2
–1
OUTPUT AMPLITUDE
vs
FREQUENCY
OUTPUT AMPLITUDE
vs
FREQUENCY
OUTPUT AMPLITUDE
vs
FREQUENCY
–60
2nd Harmonic
–70
–80
–90
1M
f – Frequency – Hz
10M 20M
Figure 28
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
VCC = ±5 V
Gain = 2
RL = 150 Ω
VO(pp) = 2 V
–100
100k
3rd Harmonic
1M
f – Frequency – Hz
Figure 29
10M 20M
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
TYPICAL CHARACTERISTICS
DISTORTION
vs
OUTPUT VOLTAGE
DISTORTION
vs
FREQUENCY
–40
–50
–40
VCC = ±15 V
Gain = 5
RL = 150 Ω
f = 1 MHz
–50
Distortion (dB)
–60
2nd Harmonic
–70
–80
2nd Harmonic
–60
VCC = ±15 V
Gain = 5
RL = 1 kΩ
f = 1 MHz
–60
Distortion (dB)
VCC = ±5 V
Gain = 2
RL = 1 kΩ
VO(pp) = 2 V
–50
Distortion – dB
DISTORTION
vs
OUTPUT VOLTAGE
3rd Harmonic
–70
2nd Harmonic
–70
–80
3rd Harmonic
–100
100k
–90
–80
3rd Harmonic
–90
–100
–90
1M
f – Frequency – Hz
10M 20M
0
5
10
15
VO – Output Voltage – V
Figure 30
DIFFERENTIAL PHASE
vs
NUMBER OF 150-Ω LOADS
DIFFERENTIAL GAIN
vs
NUMBER OF 150-Ω LOADS
0.35°
0.3°
Differential Phase
0.4
0.6
Gain = 2
RF = 1.3 kΩ
40 IRE-NTSC Modulation
Worst Case ±100 IRE Ramp
0.3
VCC = ±15 V
0.2
Gain = 2
RF = 1.3 kΩ
40 IRE-PAL Modulation
Worst Case ±100 IRE Ramp
0.5
Differential Gain – %
Gain = 2
RF = 1.3 kΩ
40 IRE-NTSC Modulation
Worst Case ±100 IRE Ramp
20
Figure 32
0.4°
0.5
5
10
15
VO – Output Voltage – V
Figure 31
DIFFERENTIAL GAIN
vs
NUMBER OF 150-Ω LOADS
Differential Gain – %
0
20
0.25°
0.2°
0.15°
0.4
VCC = ±15 V
0.3
0.2
0.1°
0.1
VCC = ±5 V
VCC = ±5 V
0.05°
VCC = ±5 V
0.1
VCC = ±15 V
0
0
0°
1
2
1
3
Figure 33
Figure 34
Figure 35
CLOSED-LOOP
OUTPUT IMPEDANCE
vs
FREQUENCY
VCC = ±5 V
VCC = ±15 V
PSRR – Power Supply Rejection Ratio – dB
Z O – Output Impedance – Ω
Differential Phase
0.2°
0.15°
VCC = ±5 V & ±15 V
Gain = 2
RF = 1 kΩ
10
1
0.05°
0°
2
Number of 150-Ω Loads
Figure 36
3
0.1
100k
1M
10M
100M
f – Frequency – Hz
1G
Figure 37
POST OFFICE BOX 655303
3
PSRR
vs
FREQUENCY
100
0.25°
1
2
Number of 150-Ω Loads
Gain = 2
RF = 1.3 kΩ
40 IRE-PAL Modulation
Worst Case ±100 IRE Ramp
0.1°
1
Number of 150-Ω Loads
0.4°
0.3°
3
Number of 150-Ω Loads
DIFFERENTIAL PHASE
vs
NUMBER OF 150-Ω LOADS
0.35°
2
• DALLAS, TEXAS 75265
80
70
VCC = ±15 V & ±5 V
+VCC & –VCC Responses
60
50
40
30
20
10
0
100k
1M
10M
f – Frequency – Hz
100M
Figure 38
9
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
TYPICAL CHARACTERISTICS
CROSSTALK
vs
FREQUENCY
90
–40
60
50
40
30
–60
–70
20
–90
100k
100M
1M
10M
f – Frequency – Hz
300
RL = 150 Ω
VCC = ±15 V
VO(PP) = 20 V
0.0
260
350
VCC = ±5 V
VO(PP) = 5 V
VCC = ±15 V
0.01%
240
220
Gain = –1
RF = 360 Ω
200
180
160
VCC = ±15 V & ±5 V
0.1%
140
250
120
200
–40
100
–20
0
20
40
60
80
TA – Free-Air Temperature – °C
1
100
2.40
2.35
–20
0
20
40
60
80
TA – Free-Air Temperature – °C
Figure 45
10
VCC = ±15 V
–2.0
–2.5
–40
5
100
–20
0
20
40
60
80
TA – Free-Air Temperature – °C
100
Figure 44
OUTPUT VOLTAGE
vs
SUPPLY VOLTAGE
15
14
TA = 25°C
TA = 25°C
V
13
VO - Output Voltage -
VCC = ±5 V & ±15 V
2.45
2.25
–40
–1.5
COMMON-MODE INPUT VOLTAGE
vs
SUPPLY VOLTAGE
V ICR - Common-Mode Input Voltage – ± V
– Input Bias Current –µA
I IB
2.30
4
VCC = ±5 V
–1.0
Figure 43
INPUT BIAS CURRENT
vs
FREE-AIR TEMPERATURE
2.50
3
–0.5
VO – Output Step Voltage – V
Figure 42
2.55
2
100k
INPUT OFFSET VOLTAGE
vs
FREE-AIR TEMPERATURE
VCC = ±5 V
0.01%
280
100
1k
10k
f – Frequency – Hz
Figure 41
SETTING TIME
vs
OUTPUT STEP
400
300
IN
1
Figure 40
Settling Time – ns
450
10
0.10
10
100M
V IO – Input Offset Voltage – mV
1M
10M
f – Frequency – Hz
SLEW RATE
vs
FREE-AIR TEMPERATURE
500
VN
–80
10
0
100k
Hz
Hz
–50
VCC = ±15 V & ±5 V
TA = 25°C
100
I n – Current Noise – pA/
70
–30
V n – Voltage Noise – nV/
80
1k
VCC = ±15 V & ±5 V
Gain = 2
RF = 2.7 kΩ
RL = 150 Ω
Figure 39
SR – Slew Rate – V/µ s
VOLTAGE & CURRENT NOISE
vs
FREQUENCY
–20
VCC = ±15 V & ±5 V
RF = 1 kΩ
VI(pp) = 2 V
Crosstalk – dB
CMRR – Common Mode Rejection Ratio – dB
CMRR
vs
FREQUENCY
11
9
7
5
12
RL = 1 kΩ
10
8
RL = 150 Ω
6
4
3
2
5
7
9
11
13
±VCC – Supply Voltage – V
15
Figure 46
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
7
11
13
9
±VCC – Supply Voltage – V
Figure 47
15
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
TYPICAL CHARACTERISTICS
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
15
1-V FALLING EDGE
RESPONSE
10
VCC = ±15 V
Gain = 1
RF = 200 Ω
RL = 150 Ω
CL = 0.01 µF
9
7
VCC = ±5 V
RL = 1 kΩ
3
VCC = ±15 V
RL = 150 Ω
1
–40
9
TA = 85°C
8
TA = 25°C
7
TA = –40°C
CL = 10 pF
6
100
0
5
7
9
11
13
± VCC – Supply Voltage – V
1-V FALLING EDGE
RESPONSE
VO – Output Voltage – V
(1 V/Div)
VO – Output Voltage – V
(0.5 V / Div)
VCC = ±5 V
Gain = 1
RF = 200 Ω
RL = 150 Ω
CL = 100 pF
150
200
250
300
50
Gain = 1
RF = 200 Ω
RF = 200 Ω
100
150
200
250
0
0
VCC = ±15 V
Gain = –1
RF = 2 kΩ
–2
1
1–V Step
0
VCC = ±5 V
–1
Gain = –1
RF = 2 kΩ
–2
RL = 150 Ω
–4
100
200
t – Time – ns
Figure 54
300
400
0
100
200
300
400
500
t – Time – ns
Figure 55
POST OFFICE BOX 655303
2
VCC = ±15 V
1
RL = 150 Ω
0
CL = 0.01 µF
–1
–2
–3
CL = 1000 pF
–4
0
250
Gain = –1
3
2
–3
CL = 1000 pF
200
4
RL = 150 Ω
–3
150
CAPACITIVE LOAD
RESPONSE
VO – Output Voltage – V
VO – Output Voltage – V
1–V Step
100
Figure 53
5–V Step
3
2
–1
50
t – Time – ns
4
5–V Step
1
CL = 100 pF
CL = 10 pF
5-V AND 1-V STEP
RESPONSE
4
3
CL = 1000 pF
Figure 52
5-V AND 1-V STEP
RESPONSE
300
RL = 150 Ω
t – Time – ns
Figure 51
VO – Output Voltage – V
VCC = ±5 V
Gain = 1
CL = 100 pF
0
250
VCC = ±15 V
CL = 10 pF
350
200
5-V FALLING EDGE
RESPONSE
CL = 1000 pF
t – Time – ns
150
Figure 50
RL = 150 Ω
CL = 10 pF
100
100
t – Time – ns
5-V FALLING EDGE
RESPONSE
CL = 1000 pF
50
50
15
Figure 49
Figure 48
0
CL = 100 pF
5
–20
0
20
40
60
80
TA – Free-Air Temperature – °C
CL = 0.01 µF
CL = 1000 pF
VO – Output Voltage – V
(1 V/Div)
5
VO – Output Voltage – V
(0.5 V / Div)
VCC = ±15 V
RL = 250 Ω
VCC = ±15 V
RL = 1 kΩ
11
I CC – Supply Current – mA
VO - Output Voltage -
V
13
• DALLAS, TEXAS 75265
–4
0.0
Gain = 1
0.5
1.0
1.5
2.0
2.5
3.0
t – Time – µs
Figure 56
11
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
TYPICAL CHARACTERISTICS
CAPACITIVE LOAD
RESPONSE
1-VOLT STEP RESPONSE
0.8
4
VCC = ±5 V
RL = 150 Ω
0
CL = 0.01 µF
–1
–2
–3
0.6
Gain = 1
0.4
RF = 200 Ω
VCC = ±5 V
RL = 150 Ω
0.2
0.0
–0.2
–0.4
–0.8
0.5
1.0
1.5
2.0
2.5
3.0
200
100
0.0
–0.2
300
0
400
100
t – Time – ns
Figure 57
200
t – Time – ns
Figure 58
Figure 59
20-VOLT STEP RESPONSE
5-V STEP RESPONSE
15
3
10
Gain = 5
5
RF = 1.3 kΩ
RL = 150 Ω
0
VCC = ±5 V
2
VCC = ±15 V
VO – Output Voltage – V
VO – Output Voltage – V
RL = 150 Ω
–0.6
0
t – Time – µs
–5
Gain = 1
RF = 200 Ω
1
RL = 150 Ω
0
–1
–2
–10
–15
–3
0
200
400
600
800
1000
0
Figure 60
POST OFFICE BOX 655303
100
200
300
t – Time – ns
t – Time – ns
12
RF = 200 Ω
0.2
–0.4
–0.6
Gain = 1
Gain = 1
0.4
VO – Output Voltage – V
VO – Output Voltage – V
VO – Output Voltage – V
2
1
0.6
VCC = ±15 V
Gain = –1
3
–4
0.0
1-VOLT STEP RESPONSE
Figure 61
• DALLAS, TEXAS 75265
400
500
300
400
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
theory of operation
The THS404x 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
fTs of several GHz. This results in an exceptionally high performance amplifier that has a wide bandwidth, high
slew rate, fast settling time, and low distortion. A simplified schematic is shown in Figure 62.
(7) VCC +
(6) OUT
IN – (2)
IN + (3)
(4) VCC –
NULL (1)
NULL (8)
Figure 62. THS4041 Simplified Schematic
noise calculations and noise figure
Noise can cause errors on very small signals. This is especially true when amplifying small signals, where
signal-to-noise ration (SNR) is very important. The noise model for the THS404x is shown in Figure 63. This
model includes all of the noise sources as follows:
•
•
•
•
en = Amplifier internal voltage noise (nV/√Hz)
IN+ = Noninverting current noise (pA/√Hz)
IN– = Inverting current noise (pA/√Hz)
eRx = Thermal voltage noise associated with each resistor (eRx = 4 kTRx )
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
13
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
noise calculations and noise figure (continued)
eRs
RS
en
Noiseless
+
_
eni
IN+
eno
eRf
RF
eRg
IN–
RG
Ǹǒ Ǔ
Figure 63. Noise Model
The total equivalent input noise density (eni) is calculated by using the following equation:
e
+
ni
Where:
en
2
ǒ
) IN )
Ǔ )ǒ ǒ
2
R
S
IN–
R
ǓǓ
ǒ
Ǔ
ø RG ) 4 kTRs ) 4 kT RF ø RG
F
2
k = Boltzmann’s constant = 1.380658 × 10–23
T = Temperature in degrees Kelvin (273 +°C)
RF || RG = Parallel resistance of RF and RG
ǒ Ǔ
To get the equivalent output noise of the amplifier, just multiply the equivalent input noise density (eni) by the
overall amplifier gain (AV).
e no
+ eni AV + e
ni
1
) RR
F
(noninverting case)
G
As the previous equations show, to keep noise at a minimum, small value resistors should be used. As the
closed-loop gain is increased (by reducing RG), the input noise is reduced considerably because of the parallel
resistance term. This leads to the general conclusion that the most dominant noise sources are the source
resistor (RS) and the internal amplifier noise voltage (en). Because noise is summed in a root-mean-squares
method, noise sources smaller than 25% of the largest noise source can be effectively ignored. This can greatly
simplify the formula and make noise calculations much easier to calculate.
For more information on noise analysis, please refer to the Noise Analysis section in Operational Amplifier
Circuits Applications Report (literature number SLVA043).
14
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
noise calculations and noise figure (continued)
This brings up another noise measurement usually preferred in RF applications, the noise figure (NF). Noise
figure is a measure of noise degradation caused by the amplifier. The value of the source resistance must be
defined and is typically 50 Ω in RF applications.
NF
+ 10log
ȱȧ
Ȳǒ
ȳȧ
Ǔȴ
e 2
ni
2
e
Rs
Because the dominant noise components are generally the source resistance and the internal amplifier noise
voltage, we can approximate noise figure as:
ȱȧ ȡȧǒ
ȧȧ )Ȣ
ȧȲ
e
NF
+ 10log
Ǔ )ǒ )
2
n
IN
1
4 kTR
Ǔ ȣȧȤȳȧ
2
R
S
S
ȧȧ
ȧȴ
Figure 64 shows the noise figure graph for the THS404x.
NOISE FIGURE
vs
SOURCE RESISTANCE
40
f = 10 kHz
TA = 25°C
35
Noise Figure (dB)
30
25
20
15
10
5
0
10
100
1k
10k
Source Resistance – Ω
100k
Figure 64. Noise Figure vs Source Resistance
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
15
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
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 THS404x has been internally compensated to maximize its bandwidth and
slew rate performance. Typically 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.
However, the THS404x has added internal circuitry that senses a capacitive load and adds extra compensation
to the internal dominant pole. As the capacitive load increases, the amplifier remains stable. But, it is not
uncommon to see a small amount of peaking in the frequency response. There are typically two ways to
compensate for this. The first is to simply increase the gain of the amplifier. This helps by increasing the phase
margin to keep peaking minimized. The second is to place an isolation resistor in series with the output of the
amplifier, as shown in Figure 65. A minimum value of 20 Ω should work well for most applications. For example,
in 75-Ω transmission systems, setting the series resistor value to 75 Ω both isolates any capacitance loading
and provides the proper line impedance matching at the source end. For more information about driving
capacitive loads, refer to the Output Resistance and Capacitance section of the Parasitic Capacitance in Op
Amp Circuits Application Report (literature number: SLOA013).
1.3 kΩ
1.3 kΩ
Input
_
20 Ω
Output
THS404x
+
CLOAD
Figure 65. Driving a Capacitive Load for Extra Stability
offset nulling
The THS404x has very low input offset voltage for a high-speed amplifier. However, if additional correction is
required, an offset nulling function has been provided on the THS4041. The input offset can be adjusted by
placing a potentiometer between terminals 1 and 8 of the device and tying the wiper to the negative supply. This
is shown in Figure 66.
VCC+
0.1 µF
+
THS4041
_
10 kΩ
0.1 µF
VCC –
Figure 66. Offset Nulling Schematic
16
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
offset voltage
The output offset voltage, (VOO) is the sum of the input offset voltage (VIO) and both input bias currents (IIB) times
the corresponding gains. The following schematic and formula can be used to calculate the output offset
voltage:
RF
IIB–
RG
+
–
VI
RS
VO
+
ǒ ǒ ǓǓ ǒ ǒ ǓǓ
IIB+
V
OO
+ VIO 1 )
R
R
F
G
" IIB) RS
1
)
R
R
F
G
" IIB– RF
Figure 67. Output Offset Voltage Model
optimizing unity gain response
Internal frequency compensation of the THS404x 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
for the G=+1 configuration. For optimum settling time and minimum ringing, a feedback resistor of 200 Ω should
be used as shown in Figure 68. Additional capacitance can also be used in parallel with the feedback resistance
if even finer optimization is required.
Input
+
THS404x
Output
_
200 Ω
Figure 68. Noninverting, Unity Gain Schematic
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
17
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
circuit layout considerations
To achieve the levels of high frequency performance of the THS404x, follow proper printed-circuit board high
frequency design techniques. A general set of guidelines is given below. In addition, a THS404x evaluation
board is available to use as a guide for layout or for evaluating the device performance.
D
D
D
D
D
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 operational amplifiers. 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.
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-mount components, the problem with stray series inductance is greatly reduced. Second, the small
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.
general PowerPAD design considerations
The THS404x is available packaged in a thermally-enhanced DGN package, which is a member of the
PowerPAD family of packages. This package is constructed using a downset leadframe upon which the die is
mounted [see Figure 69(a) and Figure 69(b)]. This arrangement results in the lead frame being exposed as a
thermal pad on the underside of the package [see Figure 69(c)]. Because this thermal pad has direct thermal
contact with the die, excellent thermal performance can be achieved by providing a good thermal path away
from the thermal pad.
The PowerPAD package allows for both assembly and thermal management in one manufacturing operation.
During the surface-mount solder operation (when the leads are being soldered), the thermal pad can also be
soldered to a copper area underneath the package. Through the use of thermal paths within this copper area,
heat can be conducted away from the package into either a ground plane or other heat dissipating device.
The PowerPAD package represents a breakthrough in combining the small area and ease of assembly of the
surface mount with the, heretofore, awkward mechanical methods of heatsinking.
18
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
general PowerPAD design considerations (continued)
DIE
Side View (a)
Thermal
Pad
DIE
End View (b)
Bottom View (c)
NOTE A: The thermal pad is electrically isolated from all terminals in the package.
Figure 69. Views of Thermally Enhanced DGN Package
Although there are many ways to properly heatsink this device, the following steps illustrate the recommended
approach.
Thermal pad area (68 mils x 70 mils) with 5 vias
(Via diameter = 13 mils)
Figure 70. PowerPAD PCB Etch and Via Pattern
1. Prepare the PCB with a top side etch pattern as shown in Figure 70. There should be etch for the leads as
well as etch for the thermal pad.
2. Place five holes in the area of the thermal pad. These holes should be 13 mils in diameter. Keep them small
so that solder wicking through the holes is not a problem during reflow.
3. Additional vias may be placed anywhere along the thermal plane outside of the thermal pad area. This helps
dissipate the heat generated by the THS404xDGN IC. These additional vias may be larger than the 13-mil
diameter vias directly under the thermal pad. They can be larger because they are not in the thermal pad
area to be soldered so that wicking is not a problem.
4. Connect all holes to the internal ground plane.
5. When connecting these holes to the ground plane, do not use the typical web or spoke via connection
methodology. Web connections have a high thermal resistance connection that is useful for slowing the heat
transfer during soldering operations. This makes the soldering of vias that have plane connections easier.
In this application, however, low thermal resistance is desired for the most efficient heat transfer. Therefore,
the holes under the THS404xDGN package should make their connection to the internal ground plane with
a complete connection around the entire circumference of the plated-through hole.
6. The top-side solder mask should leave the terminals of the package and the thermal pad area with its five
holes exposed. The bottom-side solder mask should cover the five holes of the thermal pad area. This
prevents solder from being pulled away from the thermal pad area during the reflow process.
7. Apply solder paste to the exposed thermal pad area and all of the IC terminals.
8. With these preparatory steps in place, the THS404xDGN IC is simply placed in position and run through
the solder reflow operation as any standard surface-mount component. This results in a part that is properly
installed.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
19
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
general PowerPAD design considerations (continued)
The actual thermal performance achieved with the THS404xDGN in its PowerPAD package depends on the
application. In the example above, if the size of the internal ground plane is approximately 3 inches × 3 inches,
then the expected thermal coefficient, θJA, is about 58.4_C/W. For comparison, the non-PowerPAD version of
the THS404x IC (SOIC) is shown. For a given θJA, the maximum power dissipation is shown in Figure 71 and
is calculated by the following formula:
P
Where:
+
D
ǒ Ǔ
T
–T
MAX A
q JA
PD = Maximum power dissipation of THS404x IC (watts)
TMAX = Absolute maximum junction temperature (150°C)
TA
= Free-ambient air temperature (°C)
θJA = θJC + θCA
θJC = Thermal coefficient from junction to case (°C/W)
θCA = Thermal coefficient from case to ambient air (°C/W)
MAXIMUM POWER DISSIPATION
vs
FREE-AIR TEMPERATURE
Maximum Power Dissipation – W
3.5
DGN Package
θJA = 58.4°C/W
2 oz. Trace And Copper Pad
With Solder
3
2.5
SOIC Package
High-K Test PCB
θJA = 98°C/W
2
TJ = 150°C
DGN Package
θJA = 158°C/W
2 oz. Trace And
Copper Pad
Without Solder
1.5
1
0.5
SOIC Package
Low-K Test PCB
θJA = 167°C/W
0
–40
–20
60
80
0
20
40
TA – Free-Air Temperature – °C
100
NOTE A: Results are with no air flow and PCB size = 3”× 3”
Figure 71. Maximum Power Dissipation vs Free-Air Temperature
More complete details of the PowerPAD installation process and thermal management techniques can be found
in the Texas Instruments Technical Brief, PowerPAD Thermally Enhanced Package. This document can be
found at the TI web site (www.ti.com) by searching on the key word PowerPAD. The document can also be
ordered through your local TI sales office. Refer to literature number SLMA002 when ordering.
20
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
general PowerPAD design considerations (continued)
The next consideration is the package constraints. The two sources of heat within an amplifier are quiescent
power and output power. The designer should never forget about the quiescent heat generated within the
device, especially mutiamplifier devices. Because these devices have linear output stages (Class A-B), most
of the heat dissipation is at low output voltages with high output currents. Figure 72 to Figure 75 show this effect,
along with the quiescent heat, with an ambient air temperature of 50°C. Obviously, as the ambient temperature
increases, the limit lines shown will drop accordingly. The area under each respective limit line is considered
the safe operating area. Any condition above this line will exceed the amplifier’s limits and failure may result.
When using VCC = ±5 V, there is generally not a heat problem, even with SOIC packages. But, when using VCC
= ±15 V, the SOIC package is severely limited in the amount of heat it can dissipate. The other key factor when
looking at these graphs is how the devices are mounted on the PCB. The PowerPAD devices are extremely
useful for heat dissipation. But, the device should always be soldered to a copper plane to fully use the heat
dissipation properties of the PowerPAD. The SOIC package, on the other hand, is highly dependent on how it
is mounted on the PCB. As more trace and copper area is placed around the device, θJA decreases and the
heat dissipation capability increases. The currents and voltages shown in these graphs are for the total package.
For the dual amplifier package (THS4042), the sum of the RMS output currents and voltages should be used
to choose the proper package. The graphs shown assume that both amplifier’s outputs are identical.
THS4041
MAXIMUM RMS OUTPUT CURRENT
vs
RMS OUTPUT VOLTAGE DUE TO THERMAL LIMITS
VCC = ±5 V
Tj = 150°C
TA = 50°C
180
1000
Maximum Output
Current Limit Line
| IO | – Maximum RMS Output Current – mA
| IO | – Maximum RMS Output Current – mA
200
160
140
Package With
θJA < = 120°C/W
120
100
SO-8 Package
θJA = 167°C/W
Low-K Test PCB
80
60
40
Safe Operating
Area
20
4
1
2
3
| VO | – RMS Output Voltage – V
TJ = 150°C
TA = 50°C
VCC = ±15 V
DGN Package
θJA = 58.4°C/W
Maximum Output
Current Limit Line
100
SO-8 Package
θJA = 98°C/W
High-K Test PCB
SO-8 Package
θJA = 167°C/W
Low-K Test PCB
Safe Operating
Area
10
0
0
THS4041
MAXIMUM RMS OUTPUT CURRENT
vs
RMS OUTPUT VOLTAGE DUE TO THERMAL LIMITS
5
0
3
6
9
12
| VO | – RMS Output Voltage – V
15
Figure 73
Figure 72
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
21
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
general PowerPAD design considerations (continued)
THS4042
MAXIMUM RMS OUTPUT CURRENT
vs
RMS OUTPUT VOLTAGE DUE TO THERMAL LIMITS
| IO | – Maximum RMS Output Current – mA
200
Maximum Output
Current Limit Line
Package With
θJA ≤ 60°C/W
180
160
140
120
100
SO-8 Package
θJA = 167°C/W
Low-K Test PCB
80
60
Safe Operating Area
40
VCC = ±5 V
TJ = 150°C
TA = 50°C
Both Channels
SO-8 Package
θJA = 98°C/W
High-K Test PCB
20
0
0
1
2
3
4
| VO | – RMS Output Voltage – V
5
Figure 74
THS4042
MAXIMUM RMS OUTPUT CURRENT
vs
RMS OUTPUT VOLTAGE DUE TO THERMAL LIMITS
| IO | – Maximum RMS Output Current – mA
1000
VCC = ±15 V
TJ = 150°C
TA = 50°C
Both Channels
Maximum Output
Current Limit Line
100
SO-8 Package
θJA = 98°C/W
High-K Test PCB
10
DGN Package
θJA = 58.4°C/W
Safe Operating Area
1
0
SO-8 Package
θJA = 167°C/W
Low-K Test PCB
3
6
9
12
| VO | – RMS Output Voltage – V
Figure 75
22
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
15
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
APPLICATION INFORMATION
evaluation board
An evaluation board is available for the THS4041 (literature number SLOP219) and THS4042 (literature number
SLOP233). 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 76. The circuitry has been
designed so that the amplifier may be used in either an inverting or noninverting configuration. For more
information, please refer to the THS4041 EVM User’s Guide or the THS4042 EVM User’s Guide. To order the
evaluation board, contact your local TI sales office or distributor.
VCC+
+
C3
0.1 µF
R4
1.3 kΩ
IN +
C2
6.8 µF
NULL
R5
49.9 Ω
+
R3
49.9 Ω
OUT
THS4041
_
NULL
R2
1.3 kΩ
+
C4
0.1 µF
C1
6.8 µF
IN –
VCC –
R1
49.9 Ω
Figure 76. THS4041 Evaluation Board
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
23
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
MECHANICAL INFORMATION
D (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PIN SHOWN
PINS **
0.050 (1,27)
8
14
16
A MAX
0.197
(5,00)
0.344
(8,75)
0.394
(10,00)
A MIN
0.189
(4,80)
0.337
(8,55)
0.386
(9,80)
DIM
0.020 (0,51)
0.014 (0,35)
14
0.010 (0,25) M
8
0.244 (6,20)
0.228 (5,80)
0.008 (0,20) NOM
0.157 (4,00)
0.150 (3,81)
1
Gage Plane
7
A
0.010 (0,25)
0°– 8°
0.044 (1,12)
0.016 (0,40)
Seating Plane
0.069 (1,75) MAX
0.010 (0,25)
0.004 (0,10)
0.004 (0,10)
4040047 / D 10/96
NOTES: A.
B.
C.
D.
24
All linear dimensions are in inches (millimeters).
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).
Falls within JEDEC MS-012
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
THS4041, THS4042
165-MHz C-STABLE HIGH-SPEED AMPLIFIERS
SLOS237B– MAY 1999 – REVISED FEBRUARY 2000
MECHANICAL INFORMATION
DGN (S-PDSO-G8)
PowerPAD PLASTIC SMALL-OUTLINE PACKAGE
0,38
0,25
0,65
8
0,25 M
5
Thermal Pad
(See Note D)
0,15 NOM
3,05
2,95
4,98
4,78
Gage Plane
0,25
1
0°– 6°
4
3,05
2,95
0,69
0,41
Seating Plane
1,07 MAX
0,15
0,05
0,10
4073271/A 01/98
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions include mold flash or protrusions.
The package thermal performance may be enhanced by attaching an external heat sink to the thermal pad. This pad is electrically
and thermally connected to the backside of the die and possibly selected leads.
E. Falls within JEDEC MO-187
PowerPAD is a trademark of Texas Instruments Incorporated.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
25
PACKAGE OPTION ADDENDUM
www.ti.com
19-May-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
THS4041CD
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041CDGN
ACTIVE
MSOPPower
PAD
DGN
8
80
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041CDGNG4
ACTIVE
MSOPPower
PAD
DGN
8
80
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041CDGNR
ACTIVE
MSOPPower
PAD
DGN
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041CDGNRG4
ACTIVE
MSOPPower
PAD
DGN
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041CDR
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041CDRG4
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041ID
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041IDGN
ACTIVE
MSOPPower
PAD
DGN
8
80
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041IDGNR
ACTIVE
MSOPPower
PAD
DGN
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041IDGNRG4
ACTIVE
MSOPPower
PAD
DGN
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041IDR
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4041IDRG4
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042CD
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042CDGN
ACTIVE
MSOPPower
PAD
DGN
8
80
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042CDGNG4
ACTIVE
MSOPPower
PAD
DGN
8
80
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042CDGNR
ACTIVE
MSOPPower
PAD
DGN
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042CDGNRG4
ACTIVE
MSOPPower
PAD
DGN
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042CDR
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042CDRG4
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
Addendum-Page 1
Lead/Ball Finish
MSL Peak Temp (3)
PACKAGE OPTION ADDENDUM
www.ti.com
19-May-2005
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
THS4042ID
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042IDG4
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042IDGN
ACTIVE
MSOPPower
PAD
DGN
8
80
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042IDGNR
ACTIVE
MSOPPower
PAD
DGN
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042IDGNRG4
ACTIVE
MSOPPower
PAD
DGN
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042IDR
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
THS4042IDRG4
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
Lead/Ball Finish
MSL Peak Temp (3)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 2
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
www.ti.com/broadband
Interface
interface.ti.com
Digital Control
www.ti.com/digitalcontrol
Logic
logic.ti.com
Military
www.ti.com/military
Power Mgmt
power.ti.com
Optical Networking
www.ti.com/opticalnetwork
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
Telephony
www.ti.com/telephony
Video & Imaging
www.ti.com/video
Wireless
www.ti.com/wireless
Mailing Address:
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright  2005, Texas Instruments Incorporated