U2740B-BFP TEMIC [TEMIC Semiconductors], U2740B-BFP Datasheet

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U2740B-BFP

Manufacturer Part Number
U2740B-BFP
Description
UHF AM/FM Transmitter
Manufacturer
TEMIC [TEMIC Semiconductors]
Datasheet
TELEFUNKEN Semiconductors
Rev. A3, 24-Feb-97
UHF AM/FM Transmitter
Description
The U2740B-B is an one-chip multi-purpose UHF
ASK/FSK transmitter IC designed for various applica-
tions within a wide frequency range. When a Chip-Select
(CS) signal is supplied, the IC starts operation (Power-up,
XTO, VCO, PD) and the VCO is then locked to
128
Lock-Detect (LD) output.
Features
D
D
D
D
D
D
D
D
D
Ordering Information
System Block Diagram
One-chip solution with few external components
Wide frequency range (200 to 500 MHz)
Single voltage supply (2.2 to 5.5 V) with power-down
feature
Adjustable output power with differential output for
loop antenna
PLL lock-detect signal
XTO output for C clock
ESD protection according to MIL–STD. 883
(except Pins 1, 2, 13 and 14)
Low standby current <0.25
Single lithium-cell operation
Extended Type Number
f(XTO). The locked status is indicated at the
U2740B-BFP
RF–Transmitter
Keys
1 Li cell
m
M44Cx9x
A for V
Encoder
Preliminary Information
S
= 3 V
Figure 1. System block diagram
Package
SO16
VCO
XTO
PLL
The digital data is supplied to either an AM- or FM-input
pin, the output power being set via the AM-input pin. A
differential output enables simple applications with loop
antennas. An output driver (XTO_out) can be used for
clocking the microcontrolller.
Applications
D
D
D
D
Keyless entry (automotive, domestic,...)
Alarm systems
Remote control
Communication systems
U2740B
Power
ampl.
Antenna
Remarks
U2740B
13350
1 (10)

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U2740B-BFP Summary of contents

Page 1

... ESD protection according to MIL–STD. 883 (except Pins and 14 Low standby current <0.25 A for V D Single lithium-cell operation Ordering Information Extended Type Number U2740B-BFP System Block Diagram 1 Li cell Encoder M44Cx9x Keys RF–Transmitter TELEFUNKEN Semiconductors Rev. A3, 24-Feb-97 Preliminary Information The digital data is supplied to either an AM- or FM-input pin, the output power being set via the AM-input pin ...

Page 2

... U2740B Pin Description OSC1 1 16 OSC2 GND FM_in PD_out XTAL2 8 95 9700 Figure 2. Pinning V S Power Data FM_in Clock XTO_out 2 (10) Preliminary Information Pin Symbol 1 OSC1 2 OSC2 AM_in 3 IC PAGND 4 LD ...

Page 3

... Circuit Description The transmitter PLL U2740B contains the complete RF part for a radio control system. The IC consists of a VCO, a complete PLL circuit, a crystal oscillator, a power amplifier and a power-up module. An integrated switch can be used to change the load capacitance of the crystal. VCO The VCO is a voltage-controlled current source. The frequency is determined by the external LC-tank ...

Page 4

... U2740B Absolute Maximum Ratings Parameters Supply voltage Pin 12 Voltage at Pins 13 and 14 Input current AM_in Pin 16 Output current lock detect Pin 4 Output current XTO_out Pin 10 Junction temperature Storage temperature Thermal Resistance Parameters Junction ambient SO16 Operating Range All voltages are referred to GND (Pin 5) and PAGND (Pin 15), T ...

Page 5

... OFF Pin 11 V 1.0 11, ON Pin 11, ON Pin 11 Pin Pin Pin Pin 0.40 0.44 TKI the supply voltage is 2.0 to 3.5 V, Pin 16 can R16 should be 3 U2740B Typ. Max. Unit m 0.05 0. 0.1 0.5 A 5.0 8.0 mA 5.0 6.5 mA 5.8 7.2 mA 0.18 %/K 11 13 ...

Page 6

... U2740B Electrical Characteristics AC All voltages referred to GND (Pin 5), V Parameters Test Conditions / Pins Extinction ratio Output current transmit mark 433.92 MHz) VCO Output voltage swing Difference, Pins 13 and 14 Phase detector Output current Phase detector 4) Output voltage swing ...

Page 7

... VCO :128 Ref Ref I 11 Power– XTO Clock S Power–up C Data Figure 5. locked Figure 6. U2740B R 16 Loop antenna 4 13325 Time 13326 7 (10) ...

Page 8

... U2740B Application Circuit (FSK Modulation) 2 osc 1 2 Data Lock detect Principle of Operation (FSK Modulation) CS (power-up) XTO_out 1/fxtal LD 4/fxtal AM_in (data/power) FM_in (data) RFout 8 (10) Preliminary Information VCO :128 Ref ...

Page 9

... Package Information Package SO16 Dimensions in mm 0.4 1. TELEFUNKEN Semiconductors Rev. A3, 24-Feb-97 Preliminary Information 10.0 9.85 1.4 0.25 0.10 6.15 8.89 5.85 9 technical drawings according to DIN specifications 8 U2740B 5.2 4.8 3.7 0.2 3.8 13036 9 (10) ...

Page 10

... U2740B Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment ...

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