Datasheet TSH103 Datasheet (ST)

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Page 1

Low cost triple video buffer/filter for standard video

Features

■ Triple channels

■ Internal 6 MHz reconstruction filter (4

■ 6 dB gain buffer for 75 Ω lines

■ 5 V single supply

■ Bottom of video signal close to 0 V

■ Data min. and max. physically tested and

guaranteed during production

order)

TSH103

SO-8 plastic package

Pin connections

Applications

■ Standard definition TVs

■ Set-top boxes

■ DVD players/recorders

Description

The TSH103 is a low-cost video buffer. It is dedicated to drive video signals from any video DAC output on 75 Ω video lines in standard definition. With a real benefit in terms of integration and cost saving, this product is particularly efficient for the replacement of current discrete solutions using transistors, coil and capacitors for buffering and filtering.

This triple channel is designed to drive either CVBS/Y-C or RGB or YPbPr or YUV formats. Each channel features an internal 6 MHz reconstruction filter and a 6 dB buffer (attenuation of 27 MHz sampling and good output impedance matching with the video line).

The TSH103 requires a single 5 V power supply. It is available in an SO-8 plastic package.

IN1

IN2

IN3

+Vcc

6MHz

DC shifter

LPF

6dB

OUT1

OUT2

OUT3

GND

August 2009 Doc ID 13895 Rev 2 1/12

www.st.com

Page 2

Absolute maximum ratings TSH103

1 Absolute maximum ratings

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

(1)

(4)

(2)

(3)

Ω), done for all couples of pin

3.5

1.5

200

(5)

kV kV

oper

stg

thjc

thja

Supply voltage

Maximum input voltage swing 0 to 1.5 V

Operating free air temperature range -40 to +85 °C

Storage temperature -65 to +150 °C

Maximum junction temperature 150 °C

SO-8 thermal resistance junction to case 28 °C/W

SO-8 thermal resistance junction to ambient area 157 °C/W

HBM: human body model

ESD

CDM: charged device model MM: machine model

Output short-circuit

1. All voltage values are with respect to network terminal.

2. Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for

all couples of pin combinations with other pins floating.

3. Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to the ground.

4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 combinations with other pins floating.

5. An output current limitation protects the circuit from transient currents. Short-circuits can cause excessive heating. Destructive dissipation can result from short-circuits on amplifiers.

2 Operating conditions

Table 2. Operating conditions

Symbol Parameter Value Unit

1. This range is guaranteed by design (the product is tested in full production at a 5 V single power supply).

2/12 Doc ID 13895 Rev 2

Power supply voltage 4.5 to 5.5

(1)

Page 3

TSH103 Electrical characteristics

3 Electrical characteristics

Table 3. VCC = +5 V single supply, T

= 25° C (unless otherwise specified)

amb

Symbol Parameter Test conditions Min. Typ. Max. Unit

DC performance

= 150 Ω 100 310 430

Output DC shift

Input bias current

Supply current per channel

G DC voltage gain

OUT

High level output voltage RL = 150 Ω 3.9 V

Low level output voltage RL = 150 Ω 41 46 mV

sink/Isource

-40° C < T

= 0 V 1.2

-40° C < T

= 0.5 V DC 5.5 7.1

-40° C < T

= 150 Ω 1.93 1.97 2

-40° C < T

< +85° C 312

amb

< +85° C 1.4

amb

< +85° C 5.6

amb

< +85° C 1.96

amb

56 mA

Video performance

-3 dB bandwidth Small signal, RL = 150 Ω 9.4

Cut

att

-1 dB bandwidth Small signal, R

= 150 Ω 5.1 7.4

Filter attenuation Small signal, F= 27 MHz 37 dB

gd Group delay 0 to 5 MHz 10 ns

μA

V/V

MHz

dG Differential gain R

dPh Differential phase R

= 150 Ω 0.5 %

= 150 Ω 0.5 °

Noise

en Input voltage noise 100 kHz 76 nV/√Hz

Doc ID 13895 Rev 2 3/12

Page 4

Electrical characteristics TSH103

Figure 1. Frequency response Figure 2. Gain flatness

-5

-10

-15

-20

-25

-30

Gain (dB)

-35

-40

-45

Vcc = +4.5V, +5V, +5.5V

-50

Small signal

-55

Load = 150

-60 100k 1M 10M 100M

27MHz

Frequency (Hz)

7.0

6.8

6.6

6.4

6.2

6.0

5.8

Gain (dB)

5.6

5.4

Vcc = +4.5V, +5V, +5.5V Small signal

5.2

Load = 150

5.0 100k 1M 10M

Frequency (Hz)

Figure 3. Frequency response (large signal) Figure 4. Distortion

-5

-10

-15

-20

-25

-30

Gain (dB)

-35

-40

-45

Vcc = +4.5V, +5V, +5.5V

-50

Vout = 2Vp-p

-55

Load = 150

-60 100k 1M 10M 100M

Frequency (Hz)

-40

-45

-50

-55

-60

-65

-70

Distortion (dB)

-75

-80

-85

-90

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Output Amplitude (Vp-p)

Figure 5. Quiescent current vs. supply Figure 6. Input noise vs. frequency

6.0

5.5

5.0

4.5

4.0

3.5

3.0

2.5

Icc (mA)

2.0

1.5

1.0

0.5

0.0

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

no input signal no load

Vcc (V)

260

240

220

200

180

160

140

(nV/VHz)

120

100

1k 10k 100k 1M

No load Input to GND Vcc=+5V

Frequency (Hz)

Vcc = +5V Vicm = +0.5V F = 1MHz Load = 150

4/12 Doc ID 13895 Rev 2

Page 5

TSH103 Power supply considerations

4 Power supply considerations

Correct power supply bypassing is very important for optimizing performance in highfrequency ranges. The bypass capacitors should be placed as close as possible to the IC pins to improve high-frequency bypassing. A capacitor of 100 µF is necessary to minimize the power supply noise in low frequencies. For better quality bypassing, we recommend adding a CMS 100 nF capacitor, also placed as close as possible to the IC pins.

Figure 7. Circuit for power supply bypassing

CLF = 100 µF

CHF = 100 nF

IN1 IN2 IN3

Figure 8. Noise supply rejection

Vcc=+5Vdc+0.2Vac

-10

Load=150

-20

CLF=100uF C

-30

-40

-50

-60

-70

-80

Noise supply rejection (dB)

-90

-100 100k 1M 10M

=100nF

TSH103

Frequency (Hz)

OUT1 OUT2 OUT3

AM04552

Doc ID 13895 Rev 2 5/12

Page 6

Using the TSH103 to drive video signals TSH103

5 Using the TSH103 to drive video signals

Figure 9. Video line interface implementation schematics

Video DAC

0.3 V GND

1 V

0.3 V GND

1 V

1 Vpp

DAC

load

resistor

0.7 Vpp

DAC

load

resistor

0.7 Vpp

DAC

load

resistor

+5 V

TSH103

2.3 V

0.9 V

GND

2.3 V

0.9 V

GND

2.3 V

0.9 V

GND

2 Vpp

1.4 Vpp

75 Ω

75 Ω cable

1.15 V

0.45 V

GND

1.15 V

0.45 V GND

1.15 V

0.45 V

1 Vpp

75 Ω

0.7 Vpp

75 Ω

0.7 Vpp

GND

75 Ω

The bottom of the synchronization tip at the DAC output can be as low as 0 mV. In this case, the bottom is equal to 310 mV typical at the TSH103 output (see values of the output DC shift in Ta bl e 3 ). The Y signal can be properly driven by the TSH103 because its low output rail (V

Figure 10. Details on Y or G or C

6/12 Doc ID 13895 Rev 2

) is lower than 46 mV (Tab le 3 ).

Amplitude

Y signal

DAC

GND

VBS for synchronization tip

Synchronization tip

(close to zero volt)

AM04553

White (1 V)

Black

(300 mV)

Time

AM04554

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TSH103 Using the TSH103 to drive video signals

The interface is illustrated in Figure 11. It is composed of:

● three 75-Ω resistors

● three matching resistors

● one 10 µF power supply decoupling capacitor

● one 10 nF power supply decoupling capacitor

Figure 11. Implementation of the TSH103 (output DC and AC coupling)

+5 V

DAC

Y,G

Pb,B,C

Pr,B, C

VBS

75 Ω

TSH103

TSH173

SO-8

SO8

75 Ω

Cable

+5 V

220 µF

DAC

Y,G

Pb,B,C

Pr,B, C

VBS

TSH103

TSH173

SO-8

SO8

220 µF +

220 µF

75 Ω

1. Note that the TSH103 is input DC coupling only, and not AC coupling.

Cable

AM04555

Doc ID 13895 Rev 2 7/12

Page 8

Package information TSH103

6 Package information

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK

packages, depending on their level of environmental compliance. ECOPACK®

is an ST trademark.

8/12 Doc ID 13895 Rev 2

Page 9

TSH103 Package information

6.1 SO-8 package information

Figure 12. SO-8 package mechanical drawing

Table 4. SO-8 package mechanical data

Dimensions

Ref.

Min. Typ. Max. Min. Typ. Max.

A1.750.069

A1 0.10 0.25 0.004 0.010

A2 1.25 0.049

b 0.28 0.48 0.011 0.019

c 0.17 0.23 0.007 0.010

D 4.80 4.90 5.00 0.189 0.193 0.197

E 5.80 6.00 6.20 0.228 0.236 0.244

E1 3.80 3.90 4.00 0.150 0.154 0.157

e1.27 0.050

h 0.25 0.50 0.010 0.020

L 0.40 1.27 0.016 0.050

L1 1.04 0.040

k 0 8° 1° 8°

Millimeters Inches

ccc 0.10 0.004

Doc ID 13895 Rev 2 9/12

Page 10

Ordering information TSH103

7 Ordering information

Table 5. Order codes

Part number Temperature range Package Packing Marking

TSH103ID -40° C to +85° C SO-8 Tube TSH103I

TSH103IDT -40° C to +85° C SO-8 Tape & reel TSH103I

10/12 Doc ID 13895 Rev 2

Page 11

TSH103 Revision history

8 Revision history

Table 6. Document revision history

Date Revision Changes

19-Sep-2007 1 Initial release.

Document reformatted and graphics improved.

20-Aug-2009 2

Added ESD notes under Updated SO-8 package information in

Table 1: Absolute maximum ratings.

Chapter 6.

Doc ID 13895 Rev 2 11/12

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TSH103

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12/12 Doc ID 13895 Rev 2