TSH340
320MHz Single Supply Video Buffer with Low In/Out Rail
■ Bandwidth: 320MHz
■ Single supply operation down to 3V
■ Low input & output rail
■ Very low harmonic distortion
■ Slew rate: 780V/ µ s
■ Voltage input noise: 7nV/
√
Hz
■ Specified for 150 Ω and 100 Ω loads
■ Internal gain of 6dB
■ Compatible with the PCB layout of a single op-amp
■ Tested on 5V power supply
■ Data min. and max. are tested during production
Description
The TSH340 is a single supply video buffer featuring an internal gain of 6dB and a large bandwidth of 320MHz for only 9.8mA of quiescent current.
An advantage of this circuit is its input and output negative rail feature, which is very close to GND in single supply. This rail is tested and guaranteed during production at 60mV maximum from GND on a 150 Ω load. This allows a good output swing which fits perfectly when driving a video signal on a 75
Ω
video line. Chapter 5
of this datasheet gives technical support when using the TSH340 as a driver for video DAC output on a video line. In particular, this chapter focuses on applying a video signal DC shift to avoid any clamping of the synchronization tip.
The TSH340 is available in tiny SOT23-5 and
SO8 plastic packages.
Order Codes
Part Number
TSH340ILT
TSH340ID
TSH340IDT
Temperature Range
-40°C to +85°C
Pin Connections (top view)
Applications
■ High-end video systems
■ High Definition TV (HDTV)
■ Broadcast and graphic video
■ Multimedia products
Package
SOT23-5
SO-8
Packaging
Tape & Reel
Tube
Tape & Reel
Marking
K306
TSH340I
TSH340I
April 2005 Revision 2 1/13
TSH340
1 Absolute Maximum Ratings
Table 1.
Key parameters and their absolute maximum ratings
Symbol
V
CC
V in
T oper
T std
T j
R
R
P thjc thja max.
ESD
Parameter
Supply voltage
1
Input Voltage Range
2
Operating Free Air Temperature Range
Storage Temperature
Maximum Junction Temperature
Thermal Resistance Junction to Case
SOT23-5
SO8
Thermal Resistance Junction to Ambient Area
SOT23-5
SO8
Maximum Power Dissipation (@Ta=25°C) for Tj=150°C
SOT23-5
SO8
CDM: Charged Device Model
HBM: Human Body Model
MM: Machine Model
1) All voltage values, except differential voltage, are with respect to network terminal.
2) The magnitude of input and output voltage must never exceed V
CC
+0.3V.
Table 2.
Operating conditions
Symbol Parameter
V
CC
Power Supply Voltage
Vicm Common Mode Input Voltage
1) Tested in full production at 0V/5V single power supply
Absolute Maximum Ratings
Value
6
-0.2 to +3
-40 to +85
-65 to +150
150
80
75
250
175
500
715
2
1.5
200
Value
3 to 5.5
1
-0.4 to 3
Unit
V
V
°C
°C
°C
°C/W
°C/W mW kV kV
V
Unit
V
V
2/13
Electrical Characteristics TSH340
Table 3.
V
CC
= +5V, T amb
= 25°C (unless otherwise specified)
Symbol Parameter Test Condition
DC Performance
V
I
OS ib
Output Offset Voltage
Input Bias Current
1 no Load, T amb
-40°C < T amb
< +85°C
T amb
, V icm
=0.6V
-40°C < T amb
< +85°C
∆
V cc
=200mVp-p, F=1MHz
PSR
I CC
G
Rin
Cin
Power Supply Rejection Ratio
20 log (
∆
V cc
/
∆
V out
)
Total Supply Current
DC Voltage Gain
Input Resistance
Input Capacitance no Load, V in
=100mV
R L = 150
Ω
T amb
T amb
Dynamic Performance and Output Characteristics
Bw
FPBW
SR
V
OH
V
OL
I
OUT
-3dB Bandwidth
Gain Flatness @ 0.1dB
Full Power Bandwidth
Slew Rate
High Level Output Voltage
Low Level Output Voltage
Output Short Circuit Current (Isource)
Output Current
Small Signal V out =20mVp
V icm
=0.6V, R L = 150
Ω
Small Signal V out =20mVp
V icm
=0.6V, R L = 150
Ω
V icm
R
L
=0.6V, V
= 150
Ω
OUT
= 2Vp-p,
Vicm=0.6V, V
OUT
R
L
= 150
Ω
= 2Vp-p,
R
L
= 150
Ω
R
L
= 150
Ω
T amb
-40°C < T amb
< +85°C
Vout=2Vp, T amb
Noise and Distortion eN iN
Equivalent Input Noise Voltage
Equivalent Input Noise Current
2nd Harmonic Distortion
HD2
HD3
3rd Harmonic Distortion
F = 100kHz
F = 100kHz
V
OUT
= 2Vp-p, R
L
= 150
Ω
F= 10MHz,
V
OUT
= 1Vp-p, R
L
= 150
Ω
F= 10MHz,
1) Output Offset Voltage is determined from the following expression: V
OUT
=G.
V
IN
+ V
OS
Min.
-30
1.95
190
130
3.7
45
Typ.
Max.
320
63
200
780
3.9
40
100
90
87
7
1.5
-85
-75
-5
-6.8
6
7.2
-90
9.8
2
8
3.2
+30
16
12.8
2.05
60
Unit mV
µ
A
MHz nV/
√
Hz pA/
√
Hz dBc dBc dB mA
V/V
M
Ω pF
MHz
V/
µ s
V mV mA mA
3/13
TSH340
Figure 1. Frequency response
-8
-10
-12
-14
-16
1M
8
6
4
2
0
-2
-4
-6
16
14
12
10
Vcc=5V
Load=100 or 150 Ω
SO8 and SOT23-5
10M
Frequency (Hz)
100M
Figure 2. Gain flatness - SOT23-5
7,0
6,8
6,6
6,4
6,2
6,0
5,8
5,6
5,4
5,2
5,0
1M
Vcc=5V
Load=150 Ω
Load=100 Ω
10M
Frequency (Hz)
100M
Figure 3. Total input noise vs. frequency non-inverting input in short-circuit
Vcc=5V
100
10
Electrical Characteristics
Figure 4. Frequency response on capa-load
20
C=10pF
Riso=22 Ω
C=1pF
Riso=0
10
100 1k 10k 100k
Frequency (Hz)
1M 10M
0
C=22pF
Riso=22 Ω
C=47pF
Riso=15 Ω
-10
-20
1M
Vcc=5V
Load=Riso + C//1k Ω (to ground)
10M
Frequency (Hz)
100M
C=0
Riso=0
Figure 5. Gain flatness - SO8
7,0
6,8
6,6
6,4
6,2
6,0
5,8
5,6
5,4
5,2
5,0
1M
Vcc=5V
Load=150 Ω
Load=100 Ω
10M
Frequency (Hz)
100M
Figure 6. Positive and negative slew rate
3,0
2,5
Vcc=5V
Load=100 Ω or 150 Ω
2,0
SR+
1,5
1,0
0,5 SR-
0,0
-5ns -4ns -3ns -2ns -1ns 0s
Time (ns)
1ns 2ns 3ns 4ns 5ns
4/13
Electrical Characteristics
Figure 7. Distortion on 100 Ω load
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
-85
-90
-95
-100
0
HD3
(30MHz)
HD2
(30MHz)
HD3
(10MHz)
1
HD2
(10MHz)
2
Output Amplitude (Vp-p)
3
Vcc=5V
Load=100 Ω
4
Figure 8. Output lower rail vs. frequency
500
400
Vcc=5V
Load=100 Ω or 150 Ω
300
200
100
0
10k 100k 1M
Frequency (Hz)
10M 100M
Figure 9. Output voltage swing vs. frequency
5
4
3
2
1
0
1M
Vcc=5V
Load=100 Ω or Load=150 Ω
Frequency (Hz)
10M
TSH340
Figure 10. Distortion on 150 Ω load
-65
-70
-75
-80
-85
-90
-95
-100
0
-30
-35
-40
-45
-50
-55
-60
HD3
(10MHz)
HD2
(30MHz)
HD3
(30MHz)
HD2
(10MHz)
1 2
Output Amplitude (Vp-p)
3
Vcc=5V
Load=150 Ω
4
Figure 11. Output voltage swing vs. Vcc
5
4
3
2
1
F=30MHz
Load=100 Ω or 150 Ω
0
3,00 3,25 3,50 3,75 4,00
Vcc (V)
4,25 4,50 4,75 5,00
Figure 12. Quiescent current vs. vcc
20 no load
15
10
5
0
1,5 2,0 2,5 3,0
Vcc (V)
3,5 4,0 4,5 5,0
5/13
TSH340
Figure 13. Isource
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
0,0
+3V
0,5 1,0
+5V
V OH without load
0V
1,5
Isource
2,0 2,5
V (V)
V
3,0 3,5 4,0 4,5 5,0
Figure 14. Bandwidth vs. temperature
500
450
400
350
300
250
200
150
100
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
Figure 15. Output offset vs. temperature
0
-1
-2
-3
-4
-5
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
Electrical Characteristics
Figure 16. Reverse isolation vs. frequency
0
-20
-40
-60
-80
Small Signal
Vcc=5V
-100
1M
Load=100 Ω
10M 100M
Frequency (Hz)
1G
Figure 17. Voltage gain vs. temperature
2,05
2,04
2,03
2,02
2,01
2,00
1,99
1,98
1,97
1,96
1,95
-40
Output: short-circuit
Vcc=5V
-20 0 20 40
Temperature (°C)
60 80
Figure 18. Ibias vs. temperature
7,0
6,5
6,0
5,5
5,0
4,5
4,0
3,5
3,0
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
6/13
Electrical Characteristics
Figure 19. Supply current vs. temperature
12
11
10
9
8
Vcc=5V no Load
7
-40 -20 0 20 40
Temperature (°C)
60 80
Figure 20. Output lower rail vs. temperature
0,10
0,08
Vcc=5V
Load=150 Ω
0,06
0,04
0,02
0,00
-40 -20 0 20 40
Temperature (°C)
60 80
Figure 21. Output higher rail vs. temperature
4,50
4,25
4,00
3,75
3,50
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
TSH340
7/13
TSH340 Evaluation Boards
An evaluation board kit optimized for high-speed operational amplifiers is available (order code:
KITHSEVAL/STDL). The kit includes the following evaluation boards, as well as a CD-ROM containing datasheets, articles, application notes and a user manual: z
SOT23_SINGLE_HF BOARD: Board for the evaluation of a single high-speed op-amp in SOT23-5 package.
z SO8_SINGLE_HF: Board for the evaluation of a single high-speed op-amp in SO8 package.
z SO8_DUAL_HF: Board for the evaluation of a dual high-speed op-amp in SO8 package.
z
SO8_S_MULTI: Board for the evaluation of a single high-speed op-amp in SO8 package in inverting and non-inverting configuration, dual and signle supply.
z SO14_TRIPLE: Board for the evaluation of a triple high-speed op-amp in SO14 package with video application considerations.
Board material: z z
2 layers
FR4 (
ε
r=4.6) z epoxy 1.6mm
z copper thickness: 35µm
Figure 22: Evaluation kit for high speed op-amps
8/13
Power Supply Considerations TSH340
4 Power Supply Considerations
Correct power supply bypassing is very important for optimizing performance in high-frequency ranges.
Bypass capacitors should be placed as close as possible to the IC pins to improve high-frequency bypassing. A capacitor greater than 10 µ F is necessary to minimize the distortion. For better quality bypassing, a capacitor of 10nF is added using the same implementation conditions. Bypass capacitors must be incorporated for both the negative and the positive supply. On the SO8_SINGLE_HF board, these capacitors are C8 and C6.
Figure 23: Circuit for power supply bypassing
+V
CC
+V CC
9/13
TSH340 Using the TSH340 to Drive Video Signals
5 Using the TSH340 to Drive Video Signals
Figure 24. Implementation of the video driver on output video DACs
75 Ω
75 Ω Cable
75
Ω
V
OL
(100MHz) = 180mV (
Figure 8 )
To drive the video signal properly, the output of the driver must be at least equal to 250mV
(assuming V
OS
and V
OL
variations).
z 1st solution:
Set the video DAC 0-IRE output level to 125mV.
10/13 z 2nd solution:
Implementation of a DC component in the input of the driver.
75 Ω
75
Ω
Cable
75
Ω
Package Mechanical Data
6 Package Mechanical Data
6.1 SO-8 package
DIM.
E e
C
D
A
A1
A2
B
L k
H h ddd
MIN.
1.35
0.10
1.10
0.33
0.19
4.80
3.80
5.80
0.25
0.40
SO-8 MECHANICAL DATA mm.
TYP MAX.
1.75
0.25
1.65
0.51
0.25
5.00
4.00
MIN.
0.053
0.04
0.043
0.013
0.007
0.189
0.150
1.27
6.20
0.50
0.228
0.010
1.27
0.1
8 ˚ (max.)
0.016
inch
TYP.
0.050
0.244
0.020
0.050
0.04
MAX.
0.069
0.010
0.065
0.020
0.010
0.197
0.157
TSH340
0016023/C
11/13
TSH340
6.2 SOT23-5L (5-pin) package
Package Mechanical Data
DIM.
E1 e e1
L
C
D
E
A
A1
A2 b
0.09
2.80
2.60
1.50
MIN.
0.90
0.00
0.90
0.35
0.35
SOT23-5L MECHANICAL DATA mm.
TYP
0.20
3.00
3.00
1.75
MAX.
1.45
0.15
1.30
0.50
3.5
110.2
102.3
59.0
MIN.
35.4
0.0
35.4
13.7
0 .95
1.9
0.55
13.7
mils
TYP.
37.4
74.8
7.8
118.1
118.1
68.8
MAX.
57.1
5.9
51.2
19.7
21.6
12/13
TSH340
Date
01 Jan. 2005
23 Mar. 2005
Revision
1
2
Description of Changes
First release corresponding to Preliminary Data version of datasheet.
Datasheet of mature, full-specification product.
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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All other names are the property of their respective owners
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13/13
