Data Sheet

ManualsBrandsLaird Connectivity ManualsElectronics902 - 928 MHz FHSS, 0 - 1 W, MMCX / 902 - 928 MHz FHSS, 0 - 1 W, MMCX, Long Range

Datasheet

AC4790

Version 2.1

Summary of content (32 pages)

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A Datasheet AC4790 Version 2.
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AC4790 Datasheet REVISION HISTORY Version Date Notes Contributors Approver 1.0 Initial Release Chris Downey 1.1 Changes and Revisions Chris Downey Separated Hardware Integration Guide (HIG) from User Guide information (created two separate documents). Chris Downey 2.0 19 Dec 2013 Add Related Documents section. 2.1 21 Oct 2022 Updates for Revision 2.0 hardware (AC4790-1000M, AC4790LR-1000M) Dave Drogowski Ryan Urness Added Approved Antenna List (for revision 2.0 of hardware).
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AC4790 Datasheet CONTENTS 1 AC4790 Transceiver ............................................................................................................................................................ 5 1.1 Overview .................................................................................................................................................................... 5 1.2 Features ............................................................................................................
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AC4790 Datasheet 13.3 PCB Layout .............................................................................................................................................................. 30 14 Appendix III: Product Throughput ...................................................................................................................................... 31 15 Related Documents and Files...........................................................................................................
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AC4790 Datasheet 1 AC4790 TRANSCEIVER The compact AC4790 900MHz transceiver replaces miles of cable in harsh industrial environments. Using field-proven FHSS technology, which needs no additional FCC licensing in the Americas, OEMs can easily make existing systems wireless with little or no RF expertise. 1.1 Overview The AC4790 is a member of Laird’s RAMP OEM transceiver family.
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AC4790 Datasheet 2 DETAILED SPECIFICATIONS Table 1: AC4790 Specification table GENERAL 20-Pin Interface Connector Molex 87759-0030, mates with Samtec SMM-110-02-S-D MMCX RF Connector Johnson Components 135-3711-822 Antenna AC4790-1x1: Customer must provide AC4790-200: MMCX Connector AC4790-1000: MMCX Connector AC4790LR-1000: MMCX Connector See Approved Antenna List Serial Interface Data Rate Baud rates from 1200 bps to 115200 bps Power Consumption (typical) Duty Cycle (TX = Transmit; Rx = Receive)
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AC4790 Datasheet TRANSCEIVER spec. Sensitivity -100 dBm typical @ 76.8 kbps RF Data Rate -110 dBm typical @ 76.
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AC4790 Datasheet 3 ELECTRICAL SPECIFICATIONS Table 2: Input Voltage Characteristics AC47901x1 / AC4790-1000M Signal Name AC4790-200X Unit High Min. High Max. Low Min. Low Max. High Min. High Max. Low Min. Low Max. RS485A/B N/A 12 -7 N/A N/A 12 -7 N/A V RXD 2.31 3.3 0 0.99 2 5.5 0 0.8 V GI0 2.31 3.3 0 0.99 2 5.5 0 0.8 V RTS 2.31 3.3 0 0.99 2 5.5 0 0.8 V Test 2.31 3.3 0 0.99 2 5.5 0 0.8 V GI1 2.31 3.3 0 0.99 2 5.5 0 0.8 V UP_RESET 0.8 3.
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AC4790 Datasheet 4 HARDWARE 4.1 AC4790 Pinout The AC4790 has a simple interface that allows OEM host communications with the transceiver. Table 4 shows the connector pin numbers and associated functions. The I/O direction is with respect to the transceiver. All outputs are 3.3 VDC levels and inputs are 5 VDC TTL (with the exception of AC4790-1x1 and AC4790-1000 transceivers, which have 3.3 V inputs).
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AC4790 Datasheet Pin # 1x1 Pin Type Signal Name Function 15 16 I UP_RESET RESET – Controlled by the AC4790 for power-on reset if left unconnected. After a stable power-on reset, a logic High pulse will reset the transceiver. 16 13 GND GND Signal Ground 17 17 I CMD/Data When logic Low, the transceiver interprets OEM host data as command data. When logic High, the transceiver interprets OEM host data as transmit data.
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AC4790 Datasheet bytes that must be in the buffer for CTS to be disabled (logic High). Even while CTS is disabled, the OEM host can send data to the transceiver, but it should do so carefully. Note: The CTS On/Off bytes of the EEPROM can be set to 1, in which case CTS will go High as data is sent in and Low when buffer is empty. 4.2.4 RTS With RTS disabled, the transceiver will send any received data to the OEM host as soon as it is received.
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AC4790 Datasheet 4.2.7 UP_Reset UP_Reset provides a direct connection to the reset pin on the AC4790 microprocessor and is used to force a soft reset. For a valid reset, reset must be asserted High for a minimum of 10 ms. 4.2.8 CMD /Data When logic High, the transceiver interprets incoming OEM host data as transmit data to be sent to other transceivers and their OEM hosts. When logic Low, the transceiver interprets OEM host data as command data. 4.2.
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AC4790 Datasheet 5 SERIAL INTERFACE In order for the OEM host and a transceiver to communicate over the serial interface they must be set to the same serial data rate. Refer to the following sections to ensure that the OEM host data rate matches the serial interface baud rate. 5.1 Serial Communications The AC4790 is a TTL device which can be interfaced to a compatible UART (microcontroller) or level translator to allow connection to serial devices.
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AC4790 Datasheet 5.4 OEM Host Data Rate The OEM Host Data Rate is the rate with which the OEM host and transceiver communicate over the serial interface. This rate is independent of the RF rate, which is fixed at 76.8 kbps. Possible values range from 1200 bps to 115200 bps. Note: Enabling Parity cuts throughput in half and the Interface Buffer size in half. Table 5 lists supported asynchronous serial data formats.
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AC4790 Datasheet 6 AC4790 MECHANICAL AND LAYOUT 6.1 Mechanical Drawings Interface Connector 20 pin OEM Interface connector (Molex 87759-0030, mates with Samtec SMM-110-02-S-D MMCX Jack Antenna Connector (Johnson Components 135-3711-822) AC4790 (with MMCX connector) Mechanical Figure 4: AC4790 (with MMCX connector) Mechanical https://www.lairdconnect.
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AC4790 Datasheet Figure 5: AC4790 with integral gigaAnt Antenna (on bottom) Mechanical https://www.lairdconnect.
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AC4790 Datasheet Figure 6: AC4790 1x1 Mechanical https://www.lairdconnect.
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AC4790 Datasheet Figure 7: AC4790 - 1x1 PCB Considerations https://www.lairdconnect.
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AC4790 Datasheet 7 OUTPUT POWER Figure 8: 4790-200M Figure 9: 4790-1x1 Table 7: AC4790-1000M (revision 1.0 and 2.0 hardware) Revision 1.0 Hardware EEPROM Value (Hex) https://www.lairdconnect.com/ Current (mA) Revision 2.
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AC4790 Datasheet Revision 1.0 Hardware Revision 2.0 Hardware EEPROM Value (Hex) Current (mA) dBm mW EEPROM Value (Hex) Current (mA) dBm mW 00 440 -5 0.31 0 400 -9.7 0.10 01 (Low Power) 450 9.5 8.91 1 410 6.0 3.98 02 460 15.3 33.88 2 420 11.0 12.58 03 470 18.2 66.06 3 430 14.2 26.30 04 480 20.3 107.15 4 440 16.1 40.73 05 510 21.8 151.35 5 470 17.8 60.25 06 530 22 158.48 6 490 19.2 83.17 07 (Quarter Power) 560 24 251.18 7 520 20.4 109.
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AC4790 Datasheet 8 TIMING DIAGRAMS Session Count = 8, Retries = 3 Session Count = 3, Retries = 3 https://www.lairdconnect.
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AC4790 Datasheet Session Count = 2, Retries = 2 Session Count = 1, Retries = 1 https://www.lairdconnect.
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AC4790 Datasheet 9 ORDERING INFORMATION Part Type Interface Antenna Option Output Power AC4790-1000M Module 3.3V TTL MMCX Connector 1000 mW AC4790LR-1000M Module 3.3V TTL MMCX Connector 1000 mW (Long Range) AC4790-200M Module 3.3V TTL MMCX Connector 200 mW (US, Canada Only) 9.1 Product Marketing Name Model name Product name AC4790-1000M 902 - 928 MHz FHSS, 0 - 1 W, MMCX AC4790LR-1000M 902 - 928 MHz FHSS, 0 - 1 W, MMCX, Long Range 9.
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AC4790 Datasheet 10.3 Approved Antenna List The following antennas are approved for use with the AC4790 as identified. The OEM may choose another vendor’s antenna of like type and equal or lesser gain as a listed antenna and still maintain compliance. Table 9: AC4790 Approved Antennas (for revision 1.
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AC4790 Datasheet     Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment.
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AC4790 Datasheet Information on Test Modes and Additional Testing Requirements Test tool: Laird Configuration and Test Utility Software (Range Test tab) shall be used to set the module to transmit continuously.
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AC4790 Datasheet End Product Labeling The final end product must be labeled in a visible area with the following: “Contains ISED: 2268C-44901000 / 2268C-4x90200 / 2268C-AC4490”. Plaque signalétique du produit final Le produit final doit être étiqueté dans un endroit visible avec l'inscription suivante: "Contient des ISED: 2268C-44901000 / 2268C-4x90200 / 2268C-AC4490".
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AC4790 Datasheet 10.7 Channel Warning The OEM must prevent the end-user from selecting a channel not approved for use by the governing body in the country in which this product is implemented. 11 REVISION 2.0 HARDWARE (AC4790-1000M, AC4790LR-1000M) The Qorvo RF power amplifier (RF2173) used on old pre-revision 2.0 hardware is now EoL (End of Life) and the redesigned revision 2.0 hardware uses a new Qorvo RF power amplifier (RF6886). Additionally, revision 2.
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AC4790 Datasheet 13 APPENDIX II: SAMPLE POWER SUPPLY This appendix describes a simple switching power supply that provides enough current to easily power any Laird OEM module. It utilizes low cost, off-the-shelf components that fit into a small area. This supply has an input voltage range of +6 volts to +18 volts and outputs +3.4 volts at 1.5 amps. Included is a schematic, bill of materials with manufacture's name and part numbers, and a sample PCB layout.
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AC4790 Datasheet 13.2 Schematic 13.3 PCB Layout https://www.lairdconnect.
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AC4790 Datasheet 14 APPENDIX III: PRODUCT THROUGHPUT Table 12: Product Matrix Part Number AC 4790- 1x1 AC4790- 200 AC4790-1000 Cost < $40 < $50 < $60 Size 1.0" x 1.0" x 0.125" 1.9" x 1.65" x 0.20" 1.9" x 1.65" x 0.20" Range Up to 1 mile Up to 4 miles Up to 20 miles Throughput 32kbps 20kbps 20kbps Current Draw RX 28mA 30mA 30mA Current Draw TX 80mA 106mA 1300mA Current Draw in Sleep Mode N/A N/A N/A Chan 48 48 32 Band 900MHz 900MHz 900MHz 3.
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AC4790 Datasheet 15 RELATED DOCUMENTS AND FILES The following additional AC4790 technical documents are also available from the Laird AC4790 product page at https://www.lairdconnect.