ATA5746-EK

ATA5746-EK Datasheet


• Transparent RF Receiver ICs for 315 MHz ATA5746 and MHz ATA5745 With High Receiving Sensitivity

Part Datasheet
ATA5746-EK ATA5746-EK ATA5746-EK (pdf)
Related Parts Information
ATA5745-PXQW 19 ATA5745-PXQW 19 ATA5745-PXQW 19
ATA5746-PXQW 19 ATA5746-PXQW 19 ATA5746-PXQW 19
ATA5745-PXPW 19 ATA5745-PXPW 19 ATA5745-PXPW 19
ATA5746-PXPW 19 ATA5746-PXPW 19 ATA5746-PXPW 19
ATA5745-EK ATA5745-EK ATA5745-EK
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• Transparent RF Receiver ICs for 315 MHz ATA5746 and MHz ATA5745 With High Receiving Sensitivity
• Fully Integrated PLL With Low Phase Noise VCO, PLL, and Loop Filter
• High FSK/ASK dBm ATA5746, FSK, Kbits/s, Manchester, BER 10-3
dBm ATA5746, ASK, Kbits/s, Manchester, BER 10-3 dBm ATA5745, FSK, Kbits/s, Manchester, BER 10-3 dBm ATA5745, ASK, Kbits/s, Manchester, BER 10-3
• Supply Current mA in Active Mode 3V, 25°C, ASK Mode
• Data Rate 1 Kbit/s to 10 Kbits/s Manchester ASK, 1 Kbit/s to 20 Kbits/s Manchester FSK With Four Programmable Bit Rate Ranges
• Switching Between Modulation Types ASK/FSK and Different Data Rates Possible in ms Typically, Without Hardware Modification on Board to Allow Different Modulation Schemes for RKE, TPMS
• Low Standby Current 50 µA at 3V, 25°C
• ASK/FSK Receiver Uses a Low-IF Architecture With High Selectivity, Blocking, and Low Intermodulation Typical 3-dB Blocking dBC at ±3 MHz/74.0 dBC at MHz, System I1dBCP = dBm/System IIP3 = dBm
• Telegram Pause Up to 52 ms Supported in ASK Mode
• Wide Bandwidth AGC to Handle Large Out-of-band Blockers above the System I1dBCP
• 440-kHz IF Frequency With 30-dB Image Rejection and 420-kHz IF Bandwidth to Support PLL Transmitters With Standard Crystals or SAW-based Transmitters
• RSSI Received Signal Strength Indicator With Output Signal Dynamic Range of 65 dB
• Low In-band Sensitivity Change of Typically dB Within ±160-kHz Center Frequency Change in the Complete Temperature and Supply Voltage Range
• Sophisticated Threshold Control and Quasi-peak Detector Circuit in the Data Slicer
• Fast and Stable XTO Start-up Circuit > Worst-case Start Impedance
• Clock Generation for Microcontroller
• ESD Protection at all Pins ±4 kV HBM, ±200V MM, ±500V FCDM
• Dual Supply Voltage Range 2.7V to 3.3V or 4.5V to 5.5V
• Temperature Range to +105°C
• Small 5 mm x 5 mm QFN24 Package

UHF ASK/FSK Receiver

ATA5745 ATA5746
• Automotive Keyless Entry and Tire Pressure Monitoring Systems
• Alarm, Telemetering and Energy Metering Systems
• Supports Header and Blanking Periods of Protocols Common in RKE and TPM Systems Up to 52 ms in ASK Mode
• All RF Relevant Functions are Integrated. The Single-ended RF Input is Suited for Easy

Adaptation to λ / 4 or Printed-loop Antennas
• Allows a Low-cost Application With Only 8 Passive Components
• Suitable for use in a Receiver for Joint RKE and TPMS
• Optimal Bandwidth Maximizes Sensitivity while Maintaining SAW Transmitter

Compatibility
• Clock Output Provides an External Microcontroller Crystal-precision Time Reference
• Well Suited for Use With PLL Transmitter ATA5756/ATA5757

The ATA5745/ATA5746 is a UHF ASK/FSK transparent receiver IC with low power consumption supplied in a small QFN24 package body 5 mm x 5 mm, pitch mm . ATA5745 is used in the 433 MHz to 435 MHz band of operation, and ATA5746 in 313 MHz to 317 MHz. The IC combines the functionality of remote keyless entry RKE - typically low bit rate ASK and tire pressure monitoring TPM - typically high bit rate FSK into one receiver under the control of an external microcontroller such as an ATmega48

For improved image rejection and selectivity, the IF frequency is fixed to 440 kHz. The IF block uses an 8th-order band pass yielding a receive bandwidth of 420 kHz. This enables the use of the receiver in both SAW- and PLL-based transmitter systems utilizing various types of data-bit encoding such as pulse width modulation, Manchester modulation, variable pulse modulation, pulse position modulation, and NRZ. Prevailing encryption protocols such as are easily supported due to the receiver’s ability to hold the current data slicer threshold for up to 52 ms when incoming RF telegrams contain a blanking interval. This feature eliminates erroneous noise from appearing on the demodulated data output pin, and simplifies software decoding algorithms. The decoding of the data stream must be carried out by a connected microcontroller device. Because of the highly integrated design, the only required RF components are for the purpose of receiver antenna matching.

ATA5745 and ATA5746 support Manchester bit rates of 1 Kbit/s to 10 Kbits/s in ASK and 1 Kbit/s to 20 Kbits/s in FSK mode. The four discrete bit rate passbands are selectable and cover Kbit/s to Kbits/s, Kbits/s to Kbits/s, Kbits/s to Kbits/s, and Kbits/s to Kbits/s or Kbits/s for ASK or FSK, respectively . The receiver contains an RSSI output to provide an indication of received signal strength and a SENSE input to allow the customer to select a threshold below which the DATA signal is gated off. ASK/FSK and bit rate ranges are selected by the connected microcontroller device via pins ASK_NFSK, BR0, and BR1.

Figure System Block Diagram

Antenna

ATA5745/ATA5746

Digital Control Logic

Power Supply

RF Receiver

LNA, Mixer, VCO, PLL,

IF Filter, RSSI Amp., Demodulator

Microcontroller Interface

Microcontroller 4 8
2 ATA5745/ATA5746 [Preliminary]

Figure Pinning QFN24

ATA5745/ATA5746 [Preliminary]

DATA_OUT CDEM ASK_NFSK BR1 BR0 RX

TEST2 TEST1 CLK_OUT CLK_OUT_CTRL1 CLK_OUT_CTRL0 ENABLE
24 23 22 21 20 19
7 8 9 10 11 12

TEST3 RSSI SENSE_CTRL SENSE LNA_IN LNA_GND

XTAL2 XTAL1 DVCC VS5V VS3V_AVCC

Table Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
17 18 19 20 21
23 24

Pin Description Symbol TEST2 TEST1 CLK_OUT

CLK_OUT_CTRL1 CLK_OUT_CTRL0

ENABLE XTAL2 XTAL1 DVCC VS5V

VS3V_AVCC GND

LNA_GND LNA_IN SENSE
Ordering Information

Extended Type Number ATA5745-PXPW ATA5746-PXPW ATA5745-PXQW ATA5746-PXQW

Package QFN24

Package Information

MOQ 1500 pcs 1500 pcs 6000 pcs 6000 pcs

Remarks 5 mm x 5 mm, Pb-free, MHz 5 mm x 5 mm, Pb-free, 315 MHz 5 mm x 5 mm, Pb-free, MHz 5 mm x 5 mm, Pb-free, 315 MHz

Package QFN 24 - 5 x 5 Exposed pad x acc. JEDEC OUTLINE No. MO-220 Dimensions in mm Not indicated tolerances

Drawing-No. Issue 1;
19 18
13 12
nom.
technical drawings according to DIN specifications
42 ATA5745/ATA5746 [Preliminary]

ATA5745/ATA5746 [Preliminary]

History
4596B-RKE-06/07
• Put datasheet in a new template
• Section 13 “Electrical Characteristics General” numbers and
on pages 29 to 30 changed
• Section 14 “Electrical Characteristics 3V Application” numbers and on page 36 changed
• Section 15 “Electrical Characteristics 5V Application” numbers and on page 37 changed

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Datasheet ID: ATA5746-EK 519185