RX3400 Low Power ASK Receiver IC. Description. Features. Applications. Block Diagram
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1 Low Power ASK Receiver IC the wireless IC company HiMARK Technology, Inc. reserves the right to change the product described in this datasheet. All information contained in this datasheet is subject to change without prior notice. HiMARK Technology, Inc. assumes no responsibility for the use of any circuits shown in this datasheet. Description The is a low power ASK receiver IC which is fully compatible with the Mitel KESRX01 IC and is suitable for use in a variety of low power radio applications including remote keyless entry. The is based on a single-conversion, super-heterodyne receiver architecture and incorporates an entire phase-locked loop (PLL) for precise local oscillator generation. In addition, the provides an RSSI output. Features Extremely low power operation Low external part count Receiver input frequency: MHz On-chip CO with integrated PLL using crystal oscillator reference PLL power down feature Integrated IF and data filters RSSI output SSOP-24 package (0.64 mm pitch) Applications Wireless mouse ideo sender remote controller Car alarm and home security systems Block Diagram XTAL2 XTAL1 DF2 DF1 DF0 DO RSSI CO2 CO1 CRYSTAL OSCILLATOR DATA FILTER CHARGE PUMP PFD 64 CO PD SS1 LOG AMP IF FILTER MIXER RSSI LNA PEAK 1-BIT DETECTOR COMPARATOR IF IF MIX MIX RF ASK DC1 DC2 IFIN OUT CC IN OUT SS2 RFIN REF ASK OUT PEAK Page 1 March 2001
2 Package and Pin Assignment SSOP-24 (0.64 mm pitch) IFDC XTAL2 IFDC XTAL1 IFIN 3 22 DF2 MIXOUT CC MIXIN RFOUT SS2 RFIN HiMARK DF1 DF0 DO CO2 ASKREF CO1 ASKOUT PD PEAK SS1 Symbols Dimensions in mm Dimensions in inch min. nom. max. min. nom. max. A A A b C D E E e L y θ Page 2 March 2001
3 Pin Descriptions Number Name Description Number Name Description 1 IFDC1 2 IFDC2 IF amplifier feedback decoupling connections 13 SS1 Ground 14 PD PLL power down 3 IFIN IF amplifier input 4 MIXOUT Mixer output 15 CO1 16 CO2 Open collector differential CO outputs 5 CC Nominal 5 supply 6 MIXIN RF mixer input 7 RFOUT Open collector LNA output 17 RSSI RSSI output 18 No connection 19 DO Loop filter output 8 SS2 LNA ground 9 RFIN LNA input 10 ASKREF Comparator reference level 11 ASKOUT Comparator output 12 PEAK Peak detector output 20 DF0 21 DF1 22 DF2 23 XTAL1 24 XTAL2 Data filter external connections Crystal oscillator external connections Page 3 March 2001
4 Absolute Maximum Ratings SS = SS1 = SS2 = 0 Parameter Symbol Rating Unit Supply voltage CC SS to SS Operating temperature range T OPR 40 to 85 C Storage temperature range T STG 55 to 150 C Soldering temperature range T SLD 255 C Soldering time range t SLD 10 s Recommended Operating Conditions SS1 = SS2 = 0 Parameter Symbol alue min. typ. max. Unit Supply voltage range CC RF input frequency f RFIN MHz Operating temperature T A C Page 4 March 2001
5 Electrical Characteristics ( CC = 4.75 to 7.0, SS1 = SS2 = 0, T A = 40 to 85 C unless otherwise noted) Parameter Symbol Condition alue min. typ. max. Unit Current consumption I CC,total CC = ma Current consumption (PLL off) I CC,noPLL CC = 5 ; PD = ma Sensitivity a Signal handling b Integrated IF filter 3-dB low pass cutoff frequency Adjacent channel rejection c α SENS f RFIN = 434 MHz; 2 KB/s dbm α SH f RFIN = 434 MHz; 2 KB/s -30 dbm f IF, 3dB KHz α ACR 65 db Peak detector source current I peak 500 µa Peak detector leakage current I leak 250 na Charge pump source/sink current I CP ±30 µa PD logic HIGH input voltage IH,PD CC PD logic LOW input voltage IL,PD SS2 CC + SS2 + ASKOUT logic HIGH output voltage OH,ASKOUT I load = 10 µa 0.7 CC ASKOUT logic LOW output voltage OL,ASKOUT I load = 10 µa 0.3 CC a. Sensitivity is defined as the minimum average signal level measured at the input which is necessary to achieve a bit error rate of 0.01 when the input signal is a return-to-zero (RZ) pulse with an average duty cycle of 50%. The RF input is assumed to be matched to 50 ohms. b. Signal handling is defined as the maximum input signal capable of being successfully demodulated. It is assumed that the input signal is ASK modulated with a minimum extinction ratio of 40 db. The RF input is assumed to be matched to 50 ohms. c. Adjacent channel rejection is defined for an interfering tone α ACR [db] above the receiving threshold and 10 MHz offset from the carrier giving a 3 db reduction in sensitivity. Page 5 March 2001
6 Functional Description The ASK receiver IC incorporates an LNA; mixer; PLL-based local oscillator including CO, fixed divider ( 64), reference crystal oscillator, phase-frequency detector (PFD), and charge pump; IF filter; logarithmic amplifier; data filter; peak detector; and 1- bit comparator and is capable of demodulating ASK input signals. PLL Power-down Function The PLL portion of the IC can be powered up and down through the control of the PD input (pin 14). During PLL power down operation, the reference crystal oscillator, fixed CO divider, PFD, and charge pump are all shut off and the current consumption of the IC drops by approximately 600 µa. The CO circuitry remains on and may be configured to operate as a buffer amplifier for an external SAW-based oscillator. 1-bit Comparator The integrated 1-bit comparator operates as a data slicer and squares up the data filtered RSSI output from the logarithmic amplifier. The decision threshold voltage level for the 1-bit comparator is stored on an external capacitor connected to the ASKREF pin. Page 6 March 2001
7 Application Circuit 434 MHz 100 nf 100 nf MHz 1 IF DC1 24 XTAL2 100 pf 100 pf 2 IF DC2 23 XTAL1 220 pf 3 4 IFIN MIX OUT 22 DF2 21 DF1 150 pf 220 pf cc 1 1 uf 100 pf *27 nh cc 1 *56 pf CC MIX IN RF OUT 20 DF0 19 DO 18 ANT *100 pf *56 nh *8.2 pf 8 SS2 9 RFIN 10 ASK REF CO2 15 CO1 27 nh 33 pf 47 K Ω BB KΩ 11 ASK OUT 12 PEAK 14 PD 13 SS1 33 pf 47KΩ 560 pf 4.3KΩ 1 MΩ 1 uf Data O/P Power Down *: mean Layout Dependent Page 7 March 2001
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