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PDF TSH344 Data sheet ( Hoja de datos )
| Número de pieza | TSH344 | |
| Descripción | Single - Supply Triple Video Buffer | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TSH344
340MHz Single-Supply Triple Video Buffer
■ Bandwidth: 340MHz
■ 5V single-supply operation
■ Low output rail guaranteed at 60mV max.
■ Internal gain of 6dB for a matching between 3
channels
■ Very low harmonic distortion
■ Slew rate: 740V/µs
■ Specified for 150Ω and 100Ω loads
■ Tested on 5V power supply
■ Data min. and max. are tested during
production
Description
The TSH344 is a triple single-supply video buffer
featuring an internal gain of 6dB and a large
bandwidth of 340MHz.
The main advantage of this buffer is its very low
output rail very close to GND when supplied in
single supply 0/5V. This output rail is guaranteed
by test at 60mV from GND on 150Ω. Chapter 4 of
this datasheet gives technical support when using
the TSH344 as RGB driver for video DAC output
on a video line (see TSH343 for Y-Pb-Pr signals).
The TSH344 is available in the compact SO8
plastic package for optimum space-saving.
Order Codes
Pin Connections (top view)
Pin1 identification
Top View
IN1 1
6dB
IN2 2
6dB
IN3 3
+Vcc 4
6dB
SO8
8 OUT1
7 OUT2
6 OUT3
5 GND
Applications
■ High-end video systems
■ High Definition TV (HDTV)
■ Broadcast and graphic video
■ Multimedia products
Part Number
TSH344ID
TSH344IDT
Temperature Range
-40°C to +85°C
Package
SO-8
Packing
Tube
Tape & Reel
Marking
TSH344I
TSH344I
January 2006
Rev. 2
1/14
www.st.com
14
1 page  
TSH344
Electrical Characteristics
Figure 1. Frequency response
10
8
6
4
2
0
-2
-4
-6
-8 Vcc=5V
Load=150Ω
-10
1M
10M
100M
Frequency (Hz)
Figure 2. Gain flatness
6,2
6,1
6,0
5,9
5,8
5,7
5,6
5,5
5,4
5,3 Vcc=5V
Load=150Ω
5,2
1G 1M
10M
100M
Frequency (Hz)
1G
Figure 3. Cross-talk vs. frequency (amp1)
0
-10 Small Signal
Vcc=5V
-20 Load=150Ω
-30
-40
-50
-60
-70
-80
-90
-100
1M
1/2
1/3
10M
Frequency (Hz)
100M
Figure 5. Cross-talk vs. frequency (amp3)
0
Small Signal
Vcc=5V
-20 Load=150Ω
-40
Figure 4. Cross-talk vs. frequency (amp2)
0
Small Signal
Vcc=5V
-20 Load=150Ω
-40
-60 2/1
-80
-100
1M
2/3
10M
Frequency (Hz)
100M
Figure 6. Input noise vs. frequency
Vcc=5V
DC input = 1.5V (Battery)
100
-60 3/1
-80
-100
1M
3/2
10M
Frequency (Hz)
100M
10
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
Rev. 2
5/14
5 Page 
TSH344
Using the TSH344 to Drive RGB Video Components
Figure 28 shows a schematic diagram of the use of the TSH344 to drive video output from
DACs.
The TSH344 is used to drive high definition video signals up to 30MHz on 75-ohm video
lines. It is dedicated to driving RGB signals typically between 300mV and 1V, as seen in (1).
With a very low output rail (VOL) guaranteed in test of production at 60mV maximum, it is
possible to drive the signal in single supply without any saturation of the driver against the
lower rail.
Assuming that we lose half of the signal by output impedance-matching in order to properly
drive the video line, the shifted signal is multiplied by a gain of 2 or +6dB (3).
4.1
Delay between channels
Figure 29. Measurement of the delay between each channel
5V
+6dB
75Ω
75Ω Cable
V1
75Ω
Vin
75Ω
+6dB
75Ω
75Ω Cable
V2
75Ω
+6dB
75Ω
75Ω Cable
V3
75Ω
Delay between each video component is an important aspect in high definition video
systems. To drive porperly the three video components without any relative delay, the dice of
the TSH344 is layouted out with a very symetrical geometry. The effect is direct on the
synchronization of each channel, as shown in Figure 30. No delay appears between each
channel when the same Vin signal is applied on the three inputs. Note that the delay from
the inputs the outputs equals 4ns.
Rev. 2
11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TSH344.PDF ] | |
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