Datasheet

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AISG Integrated Transceiver

MAX9947

General Description

The MAX9947 is an AISG-compliant, fully integrated

transceiver.

The MAX9947 receiver offers a typical dynamic range of

20dB and integrates a bandpass filter that operates in the

2.176MHz frequency with a narrow 200kHz bandwidth.

The MAX9947 transmitter integrates a bandpass filter

that is compliant with the AISG spectrum emission pro-

file. It can modulate OOK signals up to 115.2kbps. The

output power can be varied with external resistors from

+7dBm to +12dBm to compensate for loss in the external

circuitry and cabling.

The MAX9947 also features a direction output to facilitate

the RS-485 bus arbitration in tower-mounted equipment.

The MAX9947 is available in a small, 3mm x 3mm 16-pin

TQFN and is rated for operation in the -40°C to +85°C

temperature range.

Applications

Base Stations

Tower Equipment

Features

S Receiver Wide Input Dynamic Range

-15dBm to +5dBm in 50I

S Variable Transmitter Output Level from +7dBm to

+12dBm

S AISG-Compliant Output Emission Profile

S AutoDirection Output

S No Need of Microcontrollers to Handle Bus

Arbitration in Tower-Mounted Equipment

S Supports All AISG Data Rates

9.6kbps

38.4kbps

115.2kbps

S Bandpass Filter Compliant with AISG Protocol

Centered Around 2.176MHz

S 3.0V to 5.5V Voltage Supply

S Independent Logic Supply

S Small, 3mm x 3mm 16-Pin TQFN Package

19-5029; Rev 3; 7/11

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad. Connect EP to GND to enhance thermal

dissipation.

Functional Diagram

EVALUATION KIT

AVAILABLE

PART

TEMP

RANGE

PIN-PACKAGE

TOP

MARK

MAX9947ETE+

-40NC to

+85NC

16 TQFN-EP* AHF

MAX9947

BANDPASS FILTER

RXIN

SYNCOUT

TXOUT

1.5V

REF

-15dBm

BANDPASS FILTER

+7dBm TO +12dBm

RES BIAS

OOK

DEMODULATOR

DIRECTION

DETECTION

STATE MACHINE

ANALOG

SWITCH

GND

RXOUT

DIR

DIRMD2

DIRMD1

TXIN

XTAL2

XTAL1

Summary of content (17 pages)

PAGE 1
9-5029; Rev 3; 7/11 TION KIT EVALUA BLE AVAILA AISG Integrated Transceiver The MAX9947 is an AISG-compliant, fully integrated transceiver. The MAX9947 receiver offers a typical dynamic range of 20dB and integrates a bandpass filter that operates in the 2.176MHz frequency with a narrow 200kHz bandwidth. The MAX9947 transmitter integrates a bandpass filter that is compliant with the AISG spectrum emission profile. It can modulate OOK signals up to 115.2kbps.
PAGE 2
MAX9947 AISG Integrated Transceiver ABSOLUTE MAXIMUM RATINGS VCC to GND..............................................................-0.3V to +6V VL to GND................................................................-0.3V to +6V TXOUT, BIAS to GND................................ -0.3V to (VCC + 0.3V) RXIN, XTAL1, XTAL2, SYNCOUT, RES to GND.......-0.3V to +6V TXIN, RXOUT, DIR, DIRMD1, DIRMD2 to GND....................................... -0.3V to (VL + 0.
PAGE 3
AISG Integrated Transceiver (VCC = 5V, VL = 3.3V, TXOUT connected with 50I to RXIN, 4.1kI resistor between BIAS and RES, 10kI resistor between RES and GND, 1kI resistor between SYNCOUT and VCC, TA = TMIN to TMAX, unless otherwise specified. XTAL frequency 8.704MHz ±30ppm. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS 0.
PAGE 4
MAX9947 AISG Integrated Transceiver ELECTRICAL CHARACTERISTICS (continued) (VCC = 5V, VL = 3.3V, TXOUT connected with 50I to RXIN, 4.1kI resistor between BIAS and RES, 10kI resistor between RES and GND, 1kI resistor between SYNCOUT and VCC, TA = TMIN to TMAX, unless otherwise specified. XTAL frequency 8.704MHz ±30ppm. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITION MIN TYP MAX RXIN to RXOUT, VDIRMD1 = VDIRMD2 = 0V 8.9 11 RXIN to RXOUT, VDIRMD1 = 3.3V, VDIRMD2 = 0V (38.
PAGE 5
AISG Integrated Transceiver QUIESCENT CURRENT vs. SUPPLY VOLTAGE 17 VCC = 5.0V 21 VCC = 3.0V 18 15 3.5 4.0 4.5 5.0 5.5 MAX9947 toc03 8 6 4 0 -40 -15 10 35 60 0.9 0.7 85 1.1 1.3 SUPPLY VOLTAGE (V) TEMPERATURE (°C) VRES (V) MAXIMUM TRANSMITTER OUTPUT LEVEL vs. SUPPLY VOLTAGE MAXIMUM TRANSMITTER OUTPUT LEVEL vs. TEMPERATURE TRANSMITTER OUPUT SPECTRUM vs. FREQUENCY (9.6kbps) 8 6 4 13 VCC = 5.0V 12 VCC = 3.
PAGE 6
Typical Operating Characteristics (continued) (VCC = 5V, VL = 3.3V, TXOUT connected with 50I to RXIN, RXIN connected to 50I in series with 220nF to GND, R1 = 10kI between BIAS and RES, R2 = ∞, pullup SYNCOUT with 1kI to VL, TA = TMIN to TMAX, unless otherwise specified.) TRANSMITTER OUPUT SPECTRUM vs. FREQUENCY (115.2kbps) -20 -40 -60 -80 0 25 -20 -40 -60 -80 -100 -100 0.1 1 10 5 0 1000 100 FREQUENCY (MHz) 10 15 20 0.1 0.
PAGE 7
AISG Integrated Transceiver TRANSMITTER PROPAGATION DELAY AT 9.6kbps TRANSMITTER PROPAGATION DELAY AT 115.2kbps MAX9947 toc17 MAX9947 toc18 TXIN 2V/div TXIN 2V/div TXOUT 1V/div TXOUT 1V/div 20µs/div 2µs/div RECEIVER PROPAGATION DELAY AT 9.6kbps RECEIVER PROPAGATION DELAY AT 115.2kbps MAX9947 toc19 MAX9947 toc20 RXIN 500mV/div RXIN 500mV/div RXOUT 2V/div RXOUT 2V/div 20µs/div 2µs/div RECEIVER OUTPUT TO DIR AT 9.6kbps RECEIVER OUTPUT TO DIR AT 38.
PAGE 8
Typical Operating Characteristics (continued) (VCC = 5V, VL = 3.3V, TXOUT connected with 50I to RXIN, RXIN connected to 50I in series with 220nF to GND, R1 = 10kI between BIAS and RES, R2 = ∞, pullup SYNCOUT with 1kI to VL, TA = TMIN to TMAX, unless otherwise specified.) RECEIVER OUTPUT TO DIR AT 115.2kbps DIR TO RECEIVER OUTPUT MAX9947 toc23 MAX9947 toc24 VDIRMD1 = 0V, VDIRMD2 = VL RXOUT 2V/div RXOUT 2V/div DIR 2V/div DIR 2V/div 40µs/div 100ns/div RECEIVER OUTPUT DUTY CYCLE vs. RECEIVER INPUT (9.
PAGE 9
AISG Integrated Transceiver TXOUT RXIN BIAS RES TOP VIEW 12 11 10 9 VCC 13 8 GND XTAL1 14 7 DIRMD1 6 DIRMD2 5 DIR MAX9947 XTAL2 15 EP* 2 3 4 RXOUT SYNCOUT 1 VL + TXIN GND 16 THIN QFN (3mm x 3mm) *EP = EXPOSED PAD. CONNECT EP TO GND TO ENHANCE THERMAL DISSIPATION. Pin Description PIN 1 NAME FUNCTION SYNCOUT Sync Output. Open-drain output that outputs the 8.704MHz clock to synchronize other devices.
PAGE 10
MAX9947 AISG Integrated Transceiver Detailed Description protocol. The base is the master and it controls the flow of the data by performing the bus arbitration. The output DIR allows the equipment in the tower to avoid any involvement in the bus arbitration. See the Typical Application Circuit (Connectivity at the Tower) that shows how the MAX9947 can be used in the tower in conjunction with the RS-485 transceiver such as the MAX13485E or MAX13486E.
PAGE 11
AISG Integrated Transceiver START BIT IDLE 1 1 1 0 1 0 STOP BIT 0 IDLE 0 IDLE TXOUT AND RXIN IDLE tTX RXOUT IDLE (LOGIC-LEVEL HIGH) DIR IDLE (LOGIC-LEVEL LOW) Figure 2. The MAX9947 on the Tower: Communication Flow is from the Tower to the Base Table 1. Bit-Time Duration Selector DIRMD2* DIRMD1* AISG DATA RATE (kbps) UNITY BIT TIME (µs) 0 0 9.6 104.16 0 1 38.4 26.04 1 0 115.2 8.68 1 1 Not used Not used *DIRMD1 and DIRMD2 are internally pulled down.
PAGE 12
MAX9947 AISG Integrated Transceiver External Termination and AC-Coupling to Feeder Cable The MAX9947 transceiver works in conjunction with an external 50I termination. The termination is connected serially between TXOUT and the feeder cable. It acts as series termination for the transmitting path (data flowing from TXIN to TXOUT) and acts as parallel termination when data is being received on RXIN. The output of the transmitter is biased at 1.
PAGE 13
AISG Integrated Transceiver R2 0.1FF 0.1FF RES 12V 3.3V VL POWER SUPPLY 5.0V VCC 1FF R1 BIAS 1.5V +7dBm TO +12dBm XTAL1 8.
PAGE 14
AISG Integrated Transceiver MAX9947 Typical Application Circuit (Connectivity at the Tower) R2 0.1FF 0.1FF RES 12V 3.3V VL POWER SUPPLY 5.0V VCC 1FF R1 BIAS XTAL1 8.704MHz XTAL2 TXOUT ANALOG SWITCH BANDPASS FILTER TXIN 5V A RO B RE DIRECTION DETECTION STATE MACHINE MAX9947 REF Tx POWER: +1dBm TO +6dBm -15dBm RXOUT RXIN DE OOK DEMODULATOR DI GND COAX CABLE CF = 470pF DIRMD2 DIR 50I SYNCOUT DIRMD1 VCC MAX13486E MAX13485E RS-485 BUS TO TMA/RET 1.
PAGE 15
AISG Integrated Transceiver For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 16
MAX9947 AISG Integrated Transceiver Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 17
AISG Integrated Transceiver REVISION NUMBER REVISION DATE 0 12/09 Initial release 1 9/10 Corrected Figures 1 and 3, added soldering temperature 2 6/11 Changed top mark in Ordering Information 1 3 7/11 Added qJA and qJC data 2 DESCRIPTION PAGES CHANGED — 2, 10, 11 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.