KESRX04 DS4997 KESRX01 KESRX04/IG/QP1S KESRX04/IG/QP1T BB833 B3550 GRM39C0G151J

260 to 470MHz. ASK Receiver with Power Down Preliminary Information DS4997 - 1.5 August 1998 FEATURES s In-band interference

KESRX04 KESRX04 260 to 470MHz. ASK Receiver with Power Down Preliminary Information DS4997 DS4997 - 1.5 August 1998 FEATURES s In-band interference rejection (typ. 14dB) s -103dBm Sensitivity (IF BW = 470kHz) s AGC around LNA and Mixer s Low supply voltage (3 to 6V) s 2 stage power-down for low current applications s Interface for ceramic IF filters up to 15MHz P The KESRX04 KESRX04 is a single chip ASK (Amplitude Shift Key) Receiver IC. It is designed to operate in a variety of low power radio applications including keyless entry, general domestic and industrial remote control, RF tagging and local paging systems. The receiver offers an exceptionally high level of integration and performance to meet the local oscillator radiation requirements of regulatory authorities world-wide. Functionally the device works in the same way as the KESRX01 KESRX01 with the added features of low supply voltage, in-band interference rejection (anti-jamming detector), a 2 stage power down to enable receiver systems to be implemented with less than 1mA supply, and a wide IF bandwidth and drive stage to interface to an external ceramic IF band pass filter at intermediate frequencies from 0.2MHz to 15MHz. The KESRX04 KESRX04 is an ideal receiver for difficult reception areas where high level interferers would jam the wanted signal. The anti-jamming circuit allows operation to be possible with interfering signals which are more than 14dB stronger than the wanted signal, without the cost penalties of increased IF selectivity and frequency accuracy. IFFLT2 IFFLT1 RSSI PIN 1 REF. SPOT IFDC1 IFIN IFDC2 (9.80/10.01) VCC DETB PD XTAL1 XTAL2 IFOUT VCCRF DF0 MIXIP DF1 RFOP DF2 VEERF VCO1 RFIN VCO2 AGC VEE LF PEAK DSN DATOP QP28 Figure 1 Pin Connections (top view) APPLICATIONS s Remote Keyless Entry s Security, tagging s Remote Controlled equipment ORDERING INFORMATION KESRX04/IG/QP1S KESRX04/IG/QP1S (anti-static tubes) KESRX04/IG/QP1T KESRX04/IG/QP1T (tape and reel) ABSOLUTE MAXIMUM RATINGS Supply Voltage Vcc Storage temperature,Tstg Junction Temperature, Tj RF Input power -0.5V to +7V -55 to 150°C -55 to 150°C +20dBm from 50 agc RF Input Ceramic IF Filter mixer SAW Filter LNA RSSI detector Noise reduction Filter Local Oscillator Figure 2 Typical system application Anti-jam data filter Slicer Sliced data Ref KESRX04 KESRX04 PIN DESCRIPTION Pin Symbol 1 2 IFFLT1 IFDC1 Noise reducing IF filter Log amp dc stability capacitor Function 3 4 IFIN IFDC2 Log amp input Log amp dc stability capacitor 5 6 VCC IFOUT Positive supply IF output to external IF filter 7 8 VCCRF MIXIP Positive supply for RF circuits Mixer input 9 10 RFOP VEERF Output from LNA Negative supply for RF circuits 11 12 RFIN AGC Input to LNA RF AGC time constant 13 14 PEAK DATOP Data signal peak detect Sliced data output 15 16 DSN LF Data slice level PLL loop filter 17 18 VEE VCO2 Negative supply Voltage controlled oscillator 19 20 VCO1 DF2 Voltage controlled oscillator Data filter 21 22 DF1 DF0 Data filter Data filter 23 24 XTAL2 XTAL1 Crystal oscillator Crystal oscillator 25 26 PD DETB Power down Anti-jam detector input 27 RSSI RSSI output 28 IFFLT2 Noise reducing IF filter DESCRIPTION The single-conversion super-heterodyne receiver approach is now generally considered the way forward for ISM band type applications because of lower cost, superior selectivity, lower radiation, and flexibility over other techniques. For powerconscious, hand-held applications KESRX04 KESRX04 provides improved performance and flexibility on a lower 3.0V supply and a power-down feature allows faster switch-on times for use in a pulsed power saving mode. Although this is a relatively simple receiver, the flexibility of using an external IF filter allows the designer to choose both the selectivity and the IF in order to optimise the performance for a wide range of applications and locations world wide. 2 The KESRX04 KESRX04, with its Anti-jamming detector circuit, is an ideal ASK / OOK receiver for difficult reception areas caused by interference such as "Amateur Radio Repeater Stations" and Wireless Stereo Head-Phones". Operation is possible with interfering signals which are more than 14dB stronger that the wanted signal (IF bandwidth = 470kHz.), without the cost penalities of increased IF selectivity and frequency accuracy. Figure 2 is the system block diagram for the device with an external ceramic IF filter, SAW fillter and noise reduction filter. KESRX04 KESRX04 ELECTRICAL CHARACTERISTICS Test conditions T amb = 40°C to + 85°C, VCC = 3.0V to 6.0V. These characteristics are guaranteed by either device characterisation, production test and or design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated using test circuit Figure 12. Characteristic Symbol Value Supply voltage VCC Min 3.0 Ambient temperature Test Frequency Ta 40 Max 6.0 +85 470 local Oscillator ESD Protection: Typ Units 480.7 Conditions V °C MHz MHz local oscillator frequency configured for high side injection, except where otherwise specified All pins meet 2kV Human Body Model requirement. Except pins 9 and 11, which are limited to 700V and pins 18 and 19 which are limited to 1.00kV. ELECTRICAL CHARACTERISTICS D.C. T amb = 40°C to + 85°C, VCC = 3.0V to 6.0V. These characteristics are guaranteed by either device characterisation production test and or design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated. Parameter Symbol Min Value Typ Units Condition Max Supply Current Receive mode (PD2) Icc 3.7 4.5 mA All. PD=High. RF input