ST TSH103 User Manual

TSH103

Low cost triple video buffer/filter for standard video

Features

■Triple channels

■Internal 6 MHz reconstruction filter (4th order)

■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

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.

SO-8 plastic package

Pin connections

IN1	1	+	6MHz
			LPF
IN2	2	+	6MHz
			LPF
IN3	3	+	6MHz
			LPF
+Vcc	4	DC shifter

6dB	8	OUT1
6dB	7	OUT2
6dB	6	OUT3
	5	GND

August 2009

Doc ID 13895 Rev 2

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Absolute maximum ratings	TSH103

1 Absolute maximum ratings

Table 1.	Absolute maximum ratings
Symbol		Parameter	Value	Unit
VCC		Supply voltage (1)	6	V
Vin		Maximum input voltage swing	0 to 1.5	V
Toper		Operating free air temperature range	-40 to +85	°C
Tstg		Storage temperature	-65 to +150	°C
Tj		Maximum junction temperature	150	°C
Rthjc		SO-8 thermal resistance junction to case	28	°C/W
Rthja		SO-8 thermal resistance junction to ambient area	157	°C/W
		HBM: human body model (2)	3.5	kV
ESD		CDM: charged device model (3)	1.5	kV
		MM: machine model (4)	200	V
		Output short-circuit	(5)

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 Ω), done for all couples of pin 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
	VCC		Power supply voltage	4.5 to 5.5 (1)	V

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

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TSH103					Electrical characteristics
3	Electrical characteristics
Table 3.	VCC = +5 V single supply, Tamb = 25° C (unless otherwise specified)
Symbol		Parameter	Test conditions	Min.		Typ.	Max.	Unit
DC performance
VDC		Output DC shift	RL = 150 Ω	100		310	430	mV
			-40° C < Tamb < +85° C			312
Iib		Input bias current	Vin = 0 V			1.2		μA
			-40° C < Tamb < +85° C			1.4
ICC		Supply current per channel	Vin = 0.5 V DC			5.5	7.1	mA
			-40° C < Tamb < +85° C			5.6
G		DC voltage gain	RL = 150 Ω	1.93		1.97	2	V/V
			-40° C < Tamb < +85° C			1.96
VOH		High level output voltage	RL = 150 Ω			3.9		V
VOL		Low level output voltage	RL = 150 Ω			41	46	mV
IOUT		Isink/Isource				56		mA
Video performance
FCut		-3 dB bandwidth	Small signal, RL = 150 Ω			9.4		MHz
		-1 dB bandwidth	Small signal, RL = 150 Ω	5.1		7.4
Fatt		Filter attenuation	Small signal, F= 27 MHz			37		dB
gd		Group delay	0 to 5 MHz			10		ns
dG		Differential gain	RL = 150 Ω			0.5		%
dPh		Differential phase	RL = 150 Ω			0.5		°
Noise
en		Input voltage noise	100 kHz			76		nV/√Hz

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Electrical characteristics	TSH103
Figure 1. Frequency response	Figure 2. Gain flatness

	10					7.0
	5					6.8
	0
	-5					6.6
	-10					6.4
	-15					6.2
(dB)	-20				(dB)
	-25					6.0
Gain					Gain
	-30					5.8
	-35
	-40					5.6
	-45	Vcc = +4.5V, +5V, +5.5V				5.4	Vcc = +4.5V, +5V, +5.5V
	-50
		Small signal				5.2	Small signal
	-55
		Load = 150Ω					Load = 150Ω
	-60					5.0
	100k	1M	10M	27MHz	100M	100k	1M	10M
		Frequency (Hz)					Frequency (Hz)

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

Gain (dB)

10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45	Vcc = +4.5V, +5V, +5.5V
-50
	Vout = 2Vp-p
-55	Load = 150Ω
-60
100k	1M	10M

Frequency (Hz)

	-40
	-45
	-50
	-55		H2
(dB)
	-60
Distortion	-65
	-70
	-75		H3				Vcc = +5V
	-80						Vicm = +0.5V
	-85						F = 1MHz
							Load = 150Ω
	-90
100M	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

Icc (mA)

6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0								no input signal
0.5								no load
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

Vcc (V)

	260
	240			No load
	220			Input to GND
				Vcc=+5V
	200
(nV/VHz)	180
	160
	140
n	120
e
	100
	80
	60
	40	10k	100k	1M
	1k

Frequency (Hz)

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