u2740b ETC-unknow, u2740b Datasheet
u2740b
Related parts for u2740b
u2740b Summary of contents
Page 1
... UHF AM/FM Transmitter Description The U2740B 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 f(XTO). The locked status is indicated at the Lock-Detect (LD) output ...
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 ...