Product specification
Supersedes data of April 1993
File under Integrated Circuits, IC02
Philips Semiconductors
1995 Feb 06
Page 2
Philips SemiconductorsProduct specification
4 × 4 video switch matrixTDA8540
FEATURES
• I2C-bus or non-I2C-bus mode (controlled by
DC voltages)
• S-VHS or CVBS processing
• 3-state switches for all channels
• Selectable gain for the video channels
• sub-address facility
• Slave receiver in the I2C mode
• Auxiliary logic outputs for audio switching
• System expansion possible up to 7 devices
(28 sources)
• Static short-circuit proof outputs
• ESD protection.
APPLICATIONS
GENERAL DESCRIPTION
The TDA8540 has been designed for switching between
composite video signals, therefore the minimum of four
input lines are provided as requested for switching
between two S-VHS sources. Each of the four outputs can
be set to a high impedance state, to enable parallel
connection of several devices.
The TDA8540 is controlled via a bidirectional I2C-bus.
3 bits of the I2C address can be selected via the address
pin, thus providing a facility for parallel connection of
7 devices.
Control options via the I2C-bus:
• The input signals can be clamped at their negative peak
(top sync).
• The gain factor of the outputs can be selected between
1× or 2×.
• Each of the four outputs can individually be connected
to one of the four inputs.
• Each output can individually be set in a high impedance
state.
• Two binary output data lines can be controlled for
switching accompanying sound signals.
The SDA and SCL pins (pins 19 and 18) can be connected
2
to the I
C-bus or to DC switching voltage sources. Address
inputs S0 to S2 (pins 11, 7 and 5) are used to select
sub-addresses or switching to the non-I2C mode. Inputs
S0 to S2 can be connected to the supply voltage (HIGH) or
the ground (LOW). In this way no peripheral components
are required for selection.
2
Table 1 I
C-bus sub-addressing
SUB-ADDRESS
S2S1S0
A2A1A0
LLL000
LLH001
LHL010
LHH011
HLL100
HLH101
HHL110
2
HHHnon I
2
C-bus control
I
C addressable
After power-up the outputs are initialized in the high
impedance state, and D0 and D1 are at a LOW level.
Detailed description of the I2C-bus specification, with
applications, is given in brochure
use it”
. This brochure may be ordered using the code
“The I2C-bus and how to
9398 393 40011.
The TDA8540 is aslave receiver and the protocol is given
in Table 2.
Table 2 The TDA8540 protocol
SEQUENCE
(1)
S
SLV
(2)
(3)
A
SUBA
(3)
DATAA
(3)
DATAA
Notes
1. S = START condition.
2. Data transmission to the TDA8540 starts with the slave address (SLV).
3. A = acknowledge bit, generated by TDA8540.
4. P = STOP condition.
Table 3 Data transmission to the TDA8540 begins with SLV
A6
MSB
1001A2
A5A4A3A2A1A0
(1)
A1
(1)
Notes
1. A2 to A0: pin programmable slave address bits.
2. R/
W = 0; write only.
After the SLV, a second byte, SUB, is required for selecting the functions, as shown in Table 4.
A0
(1)
(3)
R/W
LSB
(2)
0
(4)
P
1995 Feb 065
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Philips SemiconductorsProduct specification
4 × 4 video switch matrixTDA8540
Table 4 The second byte: SUB
7MSB6543210LSB
000000RS1RS0
Options for SUB:
If SUB = 00H: access to switch control (SW1)
If SUB = 01H: access to gain/clamp/data control (GCO)
If SUB = 02H: access to output enable control (OEN).
Remarks:
If more than one data byte is sent, the SUB byte will be automatically incremented.
If more than 3 data bytes are sent, the internal counter will roll over and the device will then rewrite the first register.
Data Bytes
SWI (SUB = 00H): selects which input is connected to the different outputs, as shown in Table 5.
Table 5 SWI (SUB = 00H) selection of inputs connected to outputs
7MSB6543210LSB
S31S30S21S20S11S10S01S00
Table 6 Selection of inputs
Sj1 AND Sj0
(1)
OUTPUT
00011011
OUTjIN0IN1IN2IN3
Note
1. For j = 0 to 3.
Example: if S21 = 0 and S20 = 1, then OUT2 is connected to IN1.
GCO (SUB = 01H):
• Selects the gain of each output.
• Selects the clamp action or mean value on inputs 0 and 1.
• Determines the value of the auxiliary outputs D1 and D0.
Table 7 GCO byte
7MSB6543210LSB
G3
(1)
G2
(1)
G1
(1)
G0
(1)
CL1
(2)
CL0
(2)
D1
(3)
D0
(3)
Notes
1. For j = 0 to 3: if Gj = 0 (1), then output j has a gain of 2 (1).
2. If CL0 (CL1) = 0, then input signal on IN0 (IN1) is clamped.
3. For j = 0 or 1: if Dj = 0 (1), then logical output j is LOW (HIGH).
1995 Feb 066
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Philips SemiconductorsProduct specification
4 × 4 video switch matrixTDA8540
OEN (SUB = 02H): selects, for each output, if the output is active or high impedance, see Table 8.
Table 8 OEN (SUB = 02H) determines which output is active or high impedance
7MSB6543210LSB
(1)
X
Notes
1. X = don’t care.
2. For j = 0 to 3: if ENj = 0 (1), then OUT j is high impedance (active).
After a power-on reset:
• The outputs are set to a high impedance state; the outputs are connected to IN0; the gains are set at two and inputs
IN0 and IN1 are clamped.
• Programming of the device is necessary because the outputs are in high impedance state.
2
C-bus control
Non-I
(1)
X
(1)
X
(1)
X
EN3
(2)
EN2
(2)
EN1
(2)
EN0
(2)
If the S0, S1 and S2 pins are all connected to VCC the device will enter the non-I2C-bus mode.
After a power-on reset:
• Gain is set at two for all outputs.
• All inputs are clamped.
• All outputs are active.
• The matrix position is given by the SDA and SCL voltage level.
crosstalk attenuation between channelsnote 36070−dB
SVRRsupply voltage rejectionnote 43655−dB
1995 Feb 069
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Philips SemiconductorsProduct specification
4 × 4 video switch matrixTDA8540
SYMBOLPARAMETERCONDITIONSMIN.TYP.MAX. UNIT
∆Gmaximum gain variation100 kHz < f < 5 MHz−0.5−dB
100 kHz < f < 8.5 MHz −1−dB
100 kHz < f < 12 MHz−3−dB
α
ct
Auxiliary outputs D0 and D1 (open collector)
I
OH
V
OL
2
C-bus inputs SCL and SDA
I
I
IH
I
IL
C
i
2
C-bus output SDA
I
V
OL
Sub-address S0, S1 and S2
I
IH
I
IL
Notes
1. Gain set at 2; RL= 150 Ω; test signal D2 from CCIR 330.
2. Gain set at 2; RL= 150 Ω; test signal D1 from CCIR 17.
3. Measured from any selected input to output; f = 5 MHz; RL= 150 Ω; gain set at 2; VI= 1.5 V (peak-to-peak value).
This measurement requires an optimized board.
crosstalk attenuation of I2C-bus signals60−−dB
HIGH level output currentVOH= 5.5 V−−10µA
LOW level output voltageIOL=4mA−−0.4V
Fig.8 Plastic small outline package; 20 leads; body width 7.5 mm (SO20; SOT163-1).
1995 Feb 0614
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Philips SemiconductorsProduct specification
4 × 4 video switch matrixTDA8540
SOLDERING
Plastic small outline packages
YWAVE
B
During placement and before soldering, the component
must be fixed with a droplet of adhesive. After curing the
adhesive, the component can be soldered. The adhesive
can be applied by screen printing, pin transfer or syringe
dispensing.
Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder bath is
10 s, if allowed to cool to less than 150 °C within 6 s.
Typical dwell time is 4 s at 250 °C.
A modified wave soldering technique is recommended
using two solder waves (dual-wave), in which a turbulent
wave with high upward pressure is followed by a smooth
laminar wave. Using a mildly-activated flux eliminates the
need for removal of corrosive residues in most
applications.
Y SOLDER PASTE REFLOW
B
Reflow soldering requires the solder paste (a suspension
of fine solder particles, flux and binding agent) to be
applied to the substrate by screen printing, stencilling or
pressure-syringe dispensing before device placement.
Several techniques exist for reflowing; for example,
thermal conduction by heated belt, infrared, and
vapour-phase reflow. Dwell times vary between 50 and
300 s according to method. Typical reflow temperatures
range from 215 to 250 °C.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 min at 45 °C.
EPAIRING SOLDERED JOINTS (BY HAND-HELD SOLDERING
R
IRON OR PULSE
-HEATED SOLDER TOOL)
Fix the component by first soldering two, diagonally
opposite, end pins. Apply the heating tool to the flat part of
the pin only. Contact time must be limited to 10 s at up to
300 °C. When using proper tools, all other pins can be
soldered in one operation within 2 to 5 s at between 270
and 320 °C. (Pulse-heated soldering is not recommended
for SO packages.)
For pulse-heated solder tool (resistance) soldering of VSO
packages, solder is applied to the substrate by dipping or
by an extra thick tin/lead plating before package
placement.
Plastic dual in-line packages
BY DIP OR WAVE
The maximum permissible temperature of the solder is
260 °C; this temperature must not be in contact with the
joint for more than 5 s. The total contact time of successive
solder waves must not exceed 5 s.
The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified storage maximum. If the printed-circuit board has
been pre-heated, forced cooling may be necessary
immediately after soldering to keep the temperature within
the permissible limit.
EPAIRING SOLDERED JOINTS
R
Apply a low voltage soldering iron below the seating plane
(or not more than 2 mm above it). If its temperature is
below 300 °C, it must not be in contact for more than 10 s;
if between 300 and 400 °C, for not more than 5 s.
1995 Feb 0615
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Philips SemiconductorsProduct specification
4 × 4 video switch matrixTDA8540
DEFINITIONS
Data sheet status
Objective specificationThis data sheet contains target or goal specifications for product development.
Preliminary specificationThis data sheet contains preliminary data; supplementary data may be published later.
Product specificationThis data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
PURCHASE OF PHILIPS I
2
C COMPONENTS
2
Purchase of Philips I
components in the I2C system provided the system conforms to the I2C specification defined by
Philips. This specification can be ordered using the code 9398 393 40011.
C components conveys a license under the Philips’ I2C patent to use the
1995 Feb 0616
Page 17
Philips SemiconductorsProduct specification
4 × 4 video switch matrixTDA8540
NOTES
1995 Feb 0617
Page 18
Philips SemiconductorsProduct specification
4 × 4 video switch matrixTDA8540
NOTES
1995 Feb 0618
Page 19
Philips SemiconductorsProduct specification
4 × 4 video switch matrixTDA8540
NOTES
1995 Feb 0619
Page 20
Philips Semiconductors – a worldwide company
Argentina: IEROD, Av. Juramento 1992 - 14.b, (1428)
BUENOS AIRES, Tel. (541)786 7633, Fax. (541)786 9367
Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113,
Tel. (02)805 4455, Fax. (02)805 4466
Austria: Triester Str. 64, A-1101 WIEN, P.O. Box 213,
Tel. (01)60 101-1236, Fax. (01)60 101-1211
Belgium: Postbus 90050, 5600 PB EINDHOVEN, The Netherlands,
All rights are reserved. Reproduction in whole or in part is prohibited without the
prior written consent of the copyright owner.
The information presented in this document does not form part of any quotation
or contract, is believed to be accurate and reliable and may be changed without
notice. No liability will be accepted by the publisher for any consequence of its
use. Publication thereof does not convey nor imply any license under patent- or
other industrial or intellectual property rights.
Printed in The Netherlands
533061/1500/03/pp20Date of release: 1995 Feb 06
Document order number:9397 747 30011
Philips Semiconductors
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