Philips FI1256 MK2 DATA SHEET

BU TUNERS

DATA SHEET

FI1256 MK2

Desktop video tuner system CCIR D/K

Preliminary specification			1996 Jul 26
File under BU Tuners, DC03

Philips Components	Preliminary specification

Desktop video tuner

FI1256 MK2

system CCIR D/K

FEATURES

∙System CCIR D/K

∙True 5 V device (low power dissipation)

∙Full frequency range from channel 1 (49.75 MHz) to channel 57 (863.25 MHz)

∙PLL controlled tuning

∙True-synchronous vision IF demodulator (PLL)

∙Demodulated video output, AF sound output, second sound IF output

∙I2C-bus control of tuning, address selection, AFC status information

∙Complies with European regulations on radiation, signal handling and immunity (“CENELEC 55020, 55013’’ and

‘‘CISPR 13”)

∙Small horizontally mounted metal housing.

DESCRIPTION

The FI1200 MK2 family of front ends are designed to meet a wide range of RF applications in the PC Multi-Media environment.

The FI1256 MK2 types are available with a single 75 Ω input for TV reception. The input connector is available in either standard phono (female socket) or IEC (female socket).

The tuning and bandswitching are performed through the built-in digitally controlled I2C-bus. All front ends meet the input immunity and radiation of CISPR 13.

The FI1256 MK2 consists of a tuner section and an IF section, which are all designed on a single PCB. The front end is assembled in a metal housing made of a rectangular tin plated steel frame with front and rear covers which have soldered contacts to the frame. A single phono or IEC aerial socket is mounted on one side of the frame. All other connections are made via pins at the bottom.

The tuner section is equipped with 3 tuned RF MOSFET input stages, with a 3-band mixer-oscillator IC, containing the oscillators, mixers and IF amplifier. Tuning and band switching in the tuner section are done with a digital programmable PLL tuning system. This enables tuning with step-size programmable between 31.25, 50.0 or 62.5 kHz. A DC-DC converter is built around the PLL synthesizer IC to provide the tuning voltage, thus making the FI1256 MK2 front end a true 5 V device.

The IF section uses a true-synchronous vision IF demodulator (PLL) with an intercarrier SAW filter in front of it. The analog AFC voltage is fed to the 5-level A/D

converter in the PLL tuning IC, so that the AFC status can be read via the I2C-bus.

ORDERING INFORMATION

	TYPE	DESCRIPTION	CATALOGUE
			NUMBERS
	FI1256MK2/HM/PH	standard phono	3139 147 13741
	FI1256MK2/HM/IEC	IEC	3139 147 13751

MARKING

The following items of information are printed on a sticker that is on the top cover of the tuner:

∙Type number

∙Code number

∙Origin letter of factory

∙Change code

∙Year and week code.

INTERMEDIATE FREQUENCIES

	SYSTEM D/K	FREQUENCY(1)
		(MHz)
	Picture carrier	38.90
	Colour	34.47
	Sound 1	32.40
	Sound 2 (if applicable)	32.16

Note

1.The oscillator frequency is above the input signal frequency.

CHANNEL COVERAGE

BAND	CHANNELS
Low band	49.75 to 170.00 MHz
Mid band	170.00 to 450.00 MHz
High band	450.00 to 863.25 MHz

1996 Jul 26

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1996Jul26

HIGH BAND

MIXER - OSCILLATOR IC

DIAGRAMBLOCK

D/KsystemCCIR

tunerDesktopvideo

ComponentsPhilips

VCO

HIGH

OSC.

BAND

MID BAND

MID

IF

OSC.

BAND

VIF PLL DEMODULATOR

LOW

OSC.

BAND

3

LOW BAND

FILTER

TRAP

AGC

DC - DC

PLL

+ADC

12

11

13

14

15

24

22

23

25

handbook, full pagewidth

VS

VIF

MLC279 - 1

specification Preliminary

MK2 FI1256

(+5 V)

VT

SCL

SDA

AS

(+5 V)

2nd IF

CVBS

AF

sound

sound

output

output

Fig.1

Electrical block diagram.

Philips Components Preliminary specification

	Desktop video tuner		FI1256 MK2
	system CCIR D/K
	PINNING
	SYMBOL	PIN	DESCRIPTION
	VT	11	tuning voltage (monitor)
	VS	12	supply voltage tuner section +5 V
	SCL	13	I2C-bus serial clock
	SDA	14	I2C-bus serial data
	AS	15	I2C-bus address select
	n.c.	21	not connected
	2nd IF sound output	22	second IF sound output
	CVBS	23	Composite Video Baseband Signal output
	VIF	24	supply voltage IF section +5 V
	AF sound output	25	AF sound output
	−	TH1, TH2, TH3 and TH4	mounting tags (ground)

1996 Jul 26

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Philips Components	Preliminary specification

Desktop video tuner

FI1256 MK2

system CCIR D/K

LIMITING VALUES

Limiting values under operational conditions

The tuner can be guaranteed to function properly under the following conditions.

	SYMBOL	PARAMETER	PIN	MIN.	TYP.	MAX.	UNIT
	VS	supply voltage		4.75	5.00	5.25	V
	VS(ripple)	peak-to-peak ripple voltage susceptibility
		(at 5 V ±5%); note 1	12
		20 Hz to 100 kHz		−	−	20	mV
		>100 kHz to 500 kHz		−	−	10	mV
	IS	supply current		−	−	120	mA
	VSCL	SCL bus input voltage	13	−0.3	−	+5.25	V
	VSDA	SDA bus input voltage	14	−0.3	−	+5.25	V
	ISDA	SDA bus current (open collector)		−1	−	+5	mA
	VAS	address select voltage; note 2	15	−	−	+5.25	V
	Z	2nd IF sound output load impedance:
	IF
		DC	22	0.5	−	−	kΩ
		AC		0.5	−	−	kΩ
	ZCVBS	Composite Video Baseband Signal load
		impedance:
		DC	23	−	75	−	Ω
		AC		−	75	−	Ω
	tL	load time constant		−	−	100	ns
	VIF	IF supply voltage		4.75	5.0	5.25	V
	VIF(ripple)	peak-to-peak ripple voltage susceptibility
		(at 5 V ±5%); note 1	24
		20 Hz to 100 kHz		−	−	20	mV
		>100 kHz to 500 kHz		−	−	10	mV
	IIF	IF supply current		−	−	100	mA
	ZAF	AF sound output load impedance:
		DC	25	1.0	−	−	kΩ
		AC		0.6	−	−	kΩ

Notes

1.Sinusoidal ripple voltage superimposed on the 5 V supply voltage in the frequency range of 20 Hz to 500 kHz. Criteria for TV interference >57 dB.

2.For detailed information about the address decoding, refer to Chapter “Application information”.

1996 Jul 26

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Philips Components	Preliminary specification

Desktop video tuner

FI1256 MK2

system CCIR D/K

Environmental conditions

SYMBOL	PARAMETER	CONDITIONS	MIN.	TYP.	MAX.	UNIT
Non-operational conditions
Tamb	ambient temperature		−25	−	+85	°C
RH	relative humidity		−	−	100	%
gB	bump acceleration	25 g	−	−	245	m/s2
gS	shock acceleration	50 g	−	−	490	m/s2
	vibration amplitude	10 to 55 Hz	−	0.35	−	mm
Operational conditions
Tamb	ambient temperature		−10	−	+60	°C
RH	relative humidity		−	−	95	%

OVERALL PERFORMANCE

Conditional data

Unless otherwise specified, all electrical values for Chapter “Overall performance” apply at the following conditions.

SYMBOL	PARAMETER		VALUE	UNIT
Tamb	ambient temperature	25	±5	°C
RH	relative humidity	60	±15	%
VS	supply voltage (tuner and IF section)	5 ±0.125		V
ZCVBS	video output load impedance (DC)	>75		Ω
ZIF	IF sound output load impedance (DC)	>500		Ω
tpr	pre-heating time (+5 V at pin 24)	10		minute
ZS(AE)	aerial source impedance (unbalanced)	75		Ω

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