ST TSH103 User Manual

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

th

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.

1

IN1

IN2

2

IN3

3

+Vcc

4

6MHz

+

6MHz

+

6MHz

+

DC shifter

LPF

LPF

LPF

6dB

6dB

6dB

8

7

6

5

OUT1

OUT2

OUT3

GND

August 2009 Doc ID 13895 Rev 2 1/12

www.st.com

12

Absolute maximum ratings TSH103

1 Absolute maximum ratings

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

(1)

(4)

(2)

6V

(3)

Ω), done for all couples of pin

3.5

1.5

200

(5)

kV
kV

V

T

R

R

V

V

oper

T

T

CC

in

stg

j

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

V

CC

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)

V

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

R

V

DC

I

ib

I

CC

Output DC shift

Input bias current

Supply current per channel

G DC voltage gain

V

V

I

OUT

OH

OL

High level output voltage RL = 150 Ω 3.9 V

Low level output voltage RL = 150 Ω 41 46 mV

I

sink/Isource

L

-40° C < T

= 0 V 1.2

V

in

-40° C < T

V

= 0.5 V DC 5.5 7.1

in

-40° C < T

= 150 Ω 1.93 1.97 2

R

L

-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

F

Cut

F

att

-1 dB bandwidth Small signal, R

= 150 Ω 5.1 7.4

L

Filter attenuation Small signal, F= 27 MHz 37 dB

gd Group delay 0 to 5 MHz 10 ns

mV

μA

mA

V/V

MHz

dG Differential gain R

dPh Differential phase R

= 150 Ω 0.5 %

L

= 150 Ω 0.5 °

L

Noise

en Input voltage noise 100 kHz 76 nV/√Hz

Doc ID 13895 Rev 2 3/12

Electrical characteristics TSH103

Figure 1. Frequency response Figure 2. Gain flatness

10

5

0

-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

Ω

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

Ω

Frequency (Hz)

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

10

5

0

-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

Ω

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

H2

H3

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

n

e

100

80

60

40

1k 10k 100k 1M

No load
Input to GND
Vcc=+5V

Frequency (Hz)

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

Ω

4/12 Doc ID 13895 Rev 2