ST STV9553 User Manual

STV9553

12 ns TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER

FEATURES

■Triple-channel video amplifier

■Supply voltage up to 115 V

■80V Output dynamic range

■Perfect for PICTURE BOOST application requiring high video amplitude

■Pinning for easy PCB layout

■Supports DC coupling (optimum cost saving) and AC coupling applications.

■Built-in Voltage Gain: 20 (Typ.)

■Rise and Fall Times: 12 ns (Typ.)

■Bandwidth: 29 MHz (Typ.)

■Very low stand-by power consumption

■Perfectly matched with the STV921x preamplifiers

DESCRIPTION

The STV9553 is a triple-channel video amplifier designed in a 120V-high voltage technology and able to drive in DC-coupling mode the 3 cathodes of a CRT monitor.

The STV9553 supports PICTURE BOOST applications where video amplitude up to 50V or

PIN CONNECTIONS

above is required, ensuring a maximum quality of the still pictures or moving video.

Perfecly matched with the STV921x ST preamplifiers, it provides a highly performant and very cost effective video system.

CLIPWATT 11

(Plastic Package)

ORDER CODE: STV9553

11	OUT1
10	OUT2
9	OUT3
8	GNDP
7	VDD
6	GNDS
5	GNDA
4	IN3
3	VCC
2	IN2
1	IN1

Version 4.0

February 2002

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		Table of Contents
1	BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 3
2	PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		3
3	ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		4
4	THERMAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		4
5	ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		5
6	THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		7
	6.1	General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	6.2	Output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
7	POWER DISSIPATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		9
8	TYPICAL PERFORMANCE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		10
9	INTERNAL SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		11
10	APPLICATION HINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		12
	10.1	How to choose the high supply voltage value (VDD) in DC coupling mode . . . . . . . .	12
	10.2	Arcing Protection: schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	10.3	Arcing protection: layout and decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
	10.4	Video response optimization: schematics in DC-coupling mode . . . . . . . . . . . . . . . . .	14
	10.5	Video response optimization: outputs networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
	10.6	Video response optimization: inputs networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
	10.7	Video response optimization: layout and decoupling . . . . . . . . . . . . . . . . . . . . . . . . . .	15
	10.8	AC - Coupling mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
	10.9	Stand-by mode, spot suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
	10.10	Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
11 PACKAGE MECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			22

2

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STV9553

1 BLOCK DIAGRAM

OUT1	GNDP	OUT2		OUT3
11	8	10		9
				STV9553
	VDD	GNDP	VDD	GNDP

VDD 7

VCC 3

		VREF
6	1	5	2	4
GNDS	IN1 GNDA		IN2	IN3

2	PIN DESCRIPTION
	Pin	Name	Function
	1	IN1	Video Input (channel 1)
	2	IN2	Video Input (channel 2)
	3	VCC	Low Supply Voltage
	4	IN3	Video Input (channel 3)
	5	GNDA	Ground Analog
	6	GNDS	Ground Substrat
	7	VDD	High Supply Voltage
	8	GNDP	Ground Power
	9	OUT3	Video output (channel 3)
	10	OUT2	Video output (channel 2)
	11	OUT1	VIdeo output (channel 1)

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STV9553

3	ABSOLUTE MAXIMUM RATINGS
	Symbol	Parameter	Value	Unit
	VDD	High supply voltage	120	V
	VCC	Low supply voltage	16.5	V
		ESD susceptibility
	VESD	Human Body Model (100pF discharged through 1.5KΩ)	2	kV
		EIAJ norm (200pF discharged through 0Ω)	300	V
	IOD	Output source current (pulsed < 50μs)	80	mA
	IOG	Output sink current (pulsed < 50μs)	80	mA
	VIN Max	Maximum Input Voltage	VCC + 0.3	V
	VIN Min	Minimum Input Voltage	- 0.5	V
	TJ	Junction Temperature	150	°C
	TSTG	Storage Temperature	-20 + 150	°C

4	THERMAL DATA
	Symbol	Parameter	Value	Unit
	Rth (j-c)	Junction-Case Thermal Resistance (Max.)	3	°C/W
	Rth (j-a)	Junction-Ambient Thermal Resistance (Typ.)	35	°C/W

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STV9553

5 ELECTRICAL CHARACTERISTICS

Symbol

Parameter

Test Condit ions

Min. Typ

Max Unit

SUPPLY parameters (VCC = 12V, VDD = 110V, Tamb = 25 °C, unless otherwise specified)

VDD	High supply voltage
VCC	Low supply voltage
IDD	VDD supply current
IDDS	VDD stand-by supply current
ICC	VCC supply current

20	110	115	V
10	12	15	V
VOUT = 50V	15		mA
VCC : switched off (<1.5V)	60		μA
VOUT: low (Note 1)
VOUT = 50V	40		mA

STATIC parameters (VCC = 12V, VDD = 110V, Tamb = 25 °C)

VOUT	DC output voltage	VIN=1.90 V	77	80	83	V
dVOUT/dVDD	High voltage supply rejection	VOUT = 50V		0.5		%
dVOUT/dT	Output voltage drift versus temperature	VOUT = 80V		15		mV/°C
d VOUT/dT	Output voltage matching versus	VOUT = 80V		1		mV/°C
	temperature (Note 2)
RIN	Video input resistor	VOUT = 50V		2		kΩ
VSATH	Output saturation voltage to supply	I0 = -60mA (Note 3)		VDD - 6.5		V
VSATL	Output saturation voltage to GND	I0 = 60mA (Note 3)		11		V
G	Video Gain	VOUT = 50V		20
LE	Linearity Error	17 V<VOUT<VDD-15 V		3	8	%
VREF	Internal voltage reference			5.6		V

Note 1: The STV9553 goes into stand-by mode when Vcc is switched off (<1.5V).

In stand-by mode, Vout is set to low level.

Note 2: Matching measured between each channel.

Note 3: Pulsed current width < 50μs

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STV9553

ELECTRICAL CHARACTERISTICS (continued)

Symbol	Parameter	Test Condit ions		Min. Typ	Max	Unit
DYNAMIC parameters (see Figure 1)
tR	Rise time	VDC=50V,	V=40VPP	10.8		ns
tF	Fall time	VDC=50V,	V=40VPP	12.8		ns
OSR	Overshoot, white to black transition			5		%
OSF	Overshoot, black to white transition			0		%
G	Low frequency gain matching (Note 4)	VDC = 50V, f=1MHz			5	%
BW	Bandwidth at -3dB	VDC=50V,	V=20VPP	29		MHz
tSET	2.5% Settling time	VDC=50V,	V=40VPP	15		ns
		VDC=50V,	V=20VPP
CTL	Low frequency crosstalk	f = 1 MHz		50		dB
		VDC=50V,	V=20VPP
CTH	High frequency crosstalk	f = 20MHz		32		dB

DYNAMIC parameter in PICTURE BOOST condi tion (Note 5)

tPB	Rise/fall time	VDC=50V,		V=60VPP		15	ns
OS	Overshoot white to black or black to white	V	=50V,	V=60V	PP	9	%
PB	transition		DC

Note 4: Matching measured between each channel.

Note 5: PICTURE BOOST condition (video amplitude at 50V or above) is used in some applications when displaying still picture or moving video. In this condition the high level of contrast improves the pictures quality at the expense of the video performances (tR, tF and Overshoot) which are slightly deteriorated.

Figure 1. AC test circuit

	12V	110V
VCC	3	7	VDD	VDC V
50Ω
1			OUT	RP = 300 Ω
IN			11

8 CL=8pF

VREF

GNDP

STV9553

5

GNDA

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STV9553

6 THEORY OF OPERATION

6.1General

The STV9553 is a three-channel video amplifier supplied by a low supply voltage: VCC (typ.12V) and a high supply voltage: VDD (up to 115V).

The high values of VDD supplying the amplifier output stage allow direct control of the CRT cathodes (DC coupling mode).

In DC coupling mode, the application schematic is very simple and only a few external components are needed to drive the cathodes. In particular, there is no need of the DC-restore circuitry which is used in classical AC coupling applications.

The output voltage range is wide enough (Figure 2) to provide simultaneously :

±Cut-off adjustment (typ. 25V)

±Video contrast (typ. up to 40V),

±Brightness (with the remaining voltage range).

In normal operation, the output video signal must remain inside the linear region whatever the cut-off, brightness and contrast adjustments are.

Figure 2. Output signal, level adjustments

	VDD
15V	(A) Top Non-Lin ear Region
	(B) Cut-off Adjust. (25V Typ.)

(C) Brightness Adjust. (10V Typ.)

Linear region

Blanking pulse

Video Signal

(D) Contrast Adjust. (40V Typ.)

17V	(E) Bottom Non-Linear Region

GND

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STV9553

6.2Output voltage

A very simplified schematic of each STV9553 channel is shown in Figure 3.

The feedback network of each channel is integrated with a typical built-in voltage gain of G=20 (40k/2k). The output voltage VOUT is given by the following formula:

VOUT = (G+1) x VREF - (G x VIN)

for G = 20 and VREF = 5.6V, we have VOUT = 117.6 - 20 x VIN

Figure 3. Simplified schematic of one channel

	VDD
	40k
2k
IN	-	OUT
	+
VREF
GNDA	GNDP

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