Philips FM1236 Datasheet

BU TUNERS

DATA SH EET

FM1236

Desktop video & FM radio module system M, N

Preliminary speciﬁcation File under BU Tuners, DC03

1997 Feb 03

Philips Components Preliminary speciﬁcation

Desktop video & FM radio module system M, N

FEATURES

• System M and N, and FM radio broadcast

• True 5 V device (low power dissipation)

• Full frequency range from channel 2

(55.25 MHz) to channel 69 (801.25 MHz)

• FM band coverage from 76.0 MHz to 108.0 MHz

• PLL controlled tuning

• Programmable PLL step size (31.25, 50 or 62.5 kHz)

• True-synchronous vision IF demodulator (PLL)

• Ultra linear FM PLL demodulator for FM broadcast

• Demodulated video output, AF sound output, second

sound IF output

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

• Complies with FCC, DOC and JIS regulations on radiation

• Small horizontally mounted metal housing.

FM1236

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

In the FM radio mode, the level detector and AFT functions are provide for the auto-search routines. The level detector and AFT status can be read from the A/D bits in the status-byte. The mute function is also provided to suppress the audio output signal, if required.

The tuner AGC for both TV and FM radio operation, is generated with a novel AGC detector which measures the IF signal level directly at the tuner IF output terminals. As opposed to the conventional AGC detector, this new circuit allows a higher take-over level and offers superior immunity against tuner overload.

DESCRIPTION

The FM1236 front-end is designed to receive both TV and FM stereo signals in the PC Multimedia environment. The units are available with separate 75 Ω inputs for TV and FM broadcast reception. The input connectors available are either standard phono or F type. The tuning, bandswitching and antenna selection are made through

C bus.

the I The front-end covers the TV bands from 55.25 MHz to

801.25 MHz, inclusive of the Japanese TV bands from

91.25 MHz to 765.25 MHz. The FM band covers the

standard 87.50 MHz to 108.00 MHz and also the Japanese FM band (76.00 MHz to 91.00 MHz). An RDS decoder can be connected to the AF-MPX output. The FM1236 meets the input immunity and radiation requirements of the FCC, DOC and JIS.

The FM1236 consists of a TV tuner, an FM radio tuner and an IF section, 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. The two phono or F antenna connectors (female) are mounted on one side of the frame for the TV/FM signal inputs. All other connections are made via pins at the bottom.

The TV IF section uses an intercarrier SAW filter, followed by a true-synchronous vision IF demodulator (PLL) IC. The analog AFC voltage is fed to the 5-level A/D converter in

The demodulation of the TV sound (4.5 MHz) and FM IF (10.70 MHz) is done with a PLL demodulation circuit contained in the IF IC. In the FM radio mode, the multiplexed AF signal is then channelled to a stereo decoder IC which extracts the left/right analog signals. The multiplexed audio signal is also available at pin 25 to support RDS or BTSC implementations. The 2nd IF sound output is provided to connect external (analog 2 carrier or digital) stereo processing.

ORDERING INFORMATION

TYPE DESCRIPTION

FM1236/HM/PH standard phono 3139 147 13411 FM1236/HM/F F 3139 147 13421

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.

CATALOGUE

NUMBERS

1997 Feb 03 2

Philips Components Preliminary speciﬁcation

Desktop video & FM radio module

FM1236

system M, N

INTERMEDIATE FREQUENCIES

SYSTEM

Picture carrier 45.75 Colour 42.17 Sound 41.25 FM 10.70

CHANNEL COVERAGE

OFF-AIR CHANNELS CABLE CHANNELS

BAND

CHANNEL

FREQUENCY

(MHz)

CHANNEL

FM band − 76.00 to 108.00 −− Low band 2 to 6 55.25 to 83.25 A-2 to G 109.25 to 157.25 Mid band 7 to 13 175.25 to 211.25 H to I 163.25 to 169.25

J to ZZ 217.25 to 451.25

High band 14 to 69 471.25 to 801.25 AAA to BBB (+6 MHz) 457.25 to 469.26

FREQUENCY

(MHz)

FREQUENCY

(MHz)

PINNING

SYMBOL PIN DESCRIPTION

S(tuner)

SCL 13 I SDA 14 I AS 15 I

11 tuning voltage (monitor) 12 supply voltage tuner section +5 V

C-bus serial clock

C-bus serial data

C-bus address select AF O/P right 20 FM right channel AF O/P left 21 FM left channel

IF O/P 22 second IF sound output CVBS 23 Composite Video Baseband Signal (CVBS) output V

S(IF)

24 supply voltage IF section +5 V

AF O/P 25 AF sound output

− TH1, TH2,

mounting tags (ground)

TH3 and

TH4

1997 Feb 03 3

Philips Components Preliminary speciﬁcation

Desktop video & FM radio module system M, N

BLOCK DIAGRAM

2nd IF

FILTER

10.7 MHz

FILTER

AGC

DETECTOR

SAW

VCO

PLL VIF

DEMODULATOR

TRAP

DEMODULATOR

FM-IF

10.7 MHz

DISCRIMINATOR

STEREO

DECODER

FILTER

10.7 MHz

FM1236

(TV)

S(IF)

+5 V

CVBS

sound

output

2nd IF

AF-R AF-L

MIXER - OSCILLATOR IC

HIGH BAND

OSC.

HIGH

MID

OSC.

MID BAND

LOW

OSC.

LOW BAND

AFT

PLL

DC-DC

11 12 13 14 15 20 21 22 2524

CCA505

SDA

SCL

+5 V

S( tuner)

monitor

Fig.1 Electrical block diagram.

handbook, full pagewidth

antenna

1997 Feb 03 4

Philips Components Preliminary speciﬁcation

Desktop video & FM radio module

FM1236

system M, N

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

S(ripple)

S(tuner)

SCL

SDA

AFright(FM)

AFleft(FM)

CVBS

S(IF)

supply voltage peak-to-peak ripple voltage susceptibility

(at5V±5%); note 1:

20 Hz to 100 kHz −−5mV

>100 kHz to 500 kHz −−10 mV supply current −−120 mA SCL bus input voltage 13 −0.3 − +5.25 V SDA bus input voltage SDA bus current (open collector) −1 − +5 mA

address select voltage; note 2 15 −−+5.25 V FM right channel DC voltage FM right channel load impedance parallel

connected:

resistive value − 40 − kΩ

capacitive value − 9 − pF FM left channel DC voltage FM left channel load impedance:

resistive value − 40 − kΩ

capacitive value − 9 − pF 2nd IF sound output load impedance 22 0.5 −−kΩ Composite Video Baseband Signal load

impedance

CVBS load time constant −−100 ns IF supply voltage IF supply current −−150 mA

AF sound output load impedance parallel connected:

resistive value 5.0 −−kΩ

capacitive value −−4nF

4.75 5.00 5.25 V

−0.3 − +5.25 V

− 1.0 − V

− 75 −Ω

4.75 5.0 5.25 V

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”.

1997 Feb 03 5

Philips Components Preliminary speciﬁcation

Desktop video & FM radio module

FM1236

system M, N

Environmental conditions

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Non-operational conditions

amb

RH relative humidity −−100 % g

Operational conditions

amb

RH relative humidity −−95 %

OVERALL PERFORMANCE Conditional data

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

ambient temperature −25 − +85 °C

bump acceleration 25 g −−245 m/s shock acceleration 50 g −−490 m/s vibration amplitude 10 to 55 Hz − 0.35 − mm

ambient temperature −10 − +60 °C

2 2

SYMBOL PARAMETER VALUE UNIT

amb

ambient temperature 25 ±5 °C RH relative humidity 60 ±15 % V Z Z Z t

S CVBS IF AF

S(AE)

supply voltage (tuner and IF section) 5 ±0.125 V

video output load impedance (DC) 75 Ω

2nd IF sound output load impedance (DC) 0.5 kΩ

AF sound output load impedance 100 kΩ

pre-heating time (+5 V at pin 24) 10 minute

aerial source impedance (asymmetrical) 75 Ω

1997 Feb 03 6

+ 14 hidden pages