MAXIM MAX9947 Technical data

19-5029; Rev 3; 7/11

Functional Diagram

EVALUATION KIT

AVAILABLE

AISG Integrated Transceiver

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 profile. 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

Ordering Information

PART

MAX9947ETE+

+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Connect EP to GND to enhance thermal

dissipation.

TEMP

RANGE

-40NC to +85NC

PIN-PACKAGE

16 TQFN-EP* AHF

TOP

MARK

MAX9947

V

L

V

CC

XTAL1

XTAL2

TXIN

DIRMD1 DIRMD2

DIR

RXOUT

GND

_______________________________________________________________ Maxim Integrated Products 1

DIRECTION DETECTION

STATE MACHINE

ANALOG SWITCH

RES BIAS

+7dBm TO +12dBm

REF

-15dBm

OOK

DEMODULATOR

1.5V

TXOUT

BANDPASS FILTER

SYNCOUT

MAX9947

RXIN

BANDPASS FILTER

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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 + 0.3V)

Output Short-Circuit Current TXOUT,

SYNCOUT to VCC or GND ....................................Continuous

MAX9947

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

PACKAGE THERMAL CHARACTERISTICS (Note 1)

TQFN

Junction-to-Ambient Thermal Resistance (qJA) .......57.2°C/W

Junction-to-Case Thermal Resistance (qJC) ...............40°C/W

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

ELECTRICAL CHARACTERISTICS

(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 = T Typical values are at TA = +25°C.) (Note 2)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

DC CHARACTERISTICS

Supply Voltage V Supply Current I Logic Supply Voltage V Logic Supply Current I

Receiver Power-Supply Rejection Ratio

Output Power-Supply Rejection Ratio

LOGIC INPUTS AND OUTPUTS

Logic-Input High Threshold Voltage

Logic-Input Low Threshold Voltage

Logic-Output High Threshold Voltage

Logic-Output Low Threshold Voltage

Input Leakage Current IIH, I

SYNC INPUT (XTAL1) AND OUTPUT (SYNCOUT)

Input High Threshold Voltage V

CC

L

PSRR

V

IH

V

IL

V

OH

V

OL

XTAL1_IH

Guaranteed by PSRR 3.0 5.5 V

Guaranteed by logic supply current 1.6 5.5 V

L

V

TXIN

3.0V P VCC P 5.5V, V (Note 3)

3.0V P VCC P 5.5V, V (Note 4)

DIRMD1, DIRMD2, TXIN 0.7 x V

DIRMD1, DIRMD2, TXIN 0.3 x V

RXOUT, DIR source 3.3mA 0.9 x V

RXOUT, DIR sink 3.3mA 0.1 x V

TXIN shorted to GND or V

IL

DIRMD1, DIRMD2

to T

MIN

= 3.3V 138 380

All Other Pins Max In/Out Current ................................... ±20mA

Continuous Power Dissipation (TA = +70°C)

16-Pin TQFN (derate 17.5mW/°C) .............................1399mW

Operating Temperature Range .......................... -40°C to +85°C

Junction Temperature .....................................................+150°C

Storage Temperature Range ............................ -65°C to +150°C

Lead Temperature (soldering, 10s) ................................+300°C

Soldering Temperature (reflow) ......................................+260°C

, unless otherwise specified. XTAL frequency 8.704MHz ±30ppm.

MAX

23 35 mA

= 3.3V

TXIN

= 0V

TXIN

L

Shorted to GND +60 Shorted to V

L

49 60 dB

L

Q1

-1

0.7 x V

CC

FA

V

FA

V

2 ______________________________________________________________________________________

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 = T Typical values are at TA = +25°C.) (Note 2)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

Input Low Threshold Voltage V

Input High Leakage Current I Input Low Leakage Current I Output Low Voltage V

XTAL1_IL

XTAL1_IH

XTAL1_IL

SYNCOUT_OL

SYNCOUT source 3.3mA 0.4 V

RECEIVER FILTER

Passband f

Extra Carrier Receiver Immunity Level 1

PB_L

f

IM1_L

, f

Input amplitude 1.12V

PB_H

(the input carrier is recognized)

2.176MHz carrier amplitude (112.4mV Q3dB), extra carrier amplitude 0.8V

IM1_H

V

DIRMD1

2.176MHz carrier amplitude (112.4mV Extra Carrier Receiver Immunity Level 2

f

IM2_L

, f

Q3dB), extra carrier amplitude 0.8V

IM2_H

V

DIRMD1

V

DIRMD1

RECEIVER

Input Voltage Range V Equivalent Input Power Range P Input Impedance Z

Threshold Voltage Range V

IN

TH

VCC = 3.0V to 5.5V, f VCC = 3.0V to 5.5V, f f = f

f

RXIN

TRANSMITTER

Output Frequency f Output Frequency Variation

Output On Level at TXOUT (Note 6)

Output Off Power Level at TXOUT (Note 6)

V

P

O

Df

OUT

(Note 5)

O

V

RES

V

RES

OOK off level -40 dBm

f = fO Q200kHz f = fO Q500kHz

Output Emission Profile

10MHz P f P 25MHz 25MHz P f (Note 7) f P 1MHz

Output Impedance Z

OUT

DC 0.03 f = 10MHz 2.5

Amplifier Gain Bandwidth GBW 54 MHz

TXOUT Short-Circuit Protection I

SC

Short to GND or VCC, guaranteed over VCC range

MIN

O

to T

= V

= 3.3V, V = 0V, V

, unless otherwise specified. XTAL frequency 8.704MHz ±30ppm.

MAX

DIRMD2

= 2.176MHz

= 1.5V (maximum)

= 0.7V (minimum)

0.3 x V

CC

10

-10

P-P

,

1.1 4.17 MHz

= 0V (9.6kbps)

P-P

,

P-P

= 0V (38.4kbps),

4.17 MHz

= 3.3V (115.2kbps)

= 2.176MHz 1.12 V

RXIN

= 2.176MHz +5 dBm

RXIN

11 27

-18 -15 -12 dBm

79.72 112.4 158.48 mV

2.176 MHz Q100

11.1 12 dBm

2.24 2.52 V

5.38 6.28 dBm

1.30 1.17 V

-10

-30

-41

-72

-41

Q200

V

FA FA

P-P

kI

P-P

ppm

P-P

dB

I

mA

MAX9947

_______________________________________________________________________________________ 3

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 = T Typical values are at TA = +25°C.) (Note 2)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

SWITCHING CHARACTERISTICS

MAX9947

Receiver Propagation Delay t

Receiver Output Rise and Fall Time

Transmitter Propagation Delay t DIR to RXOUT Delay (Note 8) t

Direction Duration High t

Receiver Output Data Duty-Cycle Variation

RX

tR, t

F

TX

DIR, SKEW

DIR, HIGH

DDC

RXIN to RXOUT, V

RXIN to RXOUT, V V

DIRMD2

V

DIRMD2

10% to 90%, RL = 1kI, CL = 10pF

TXIN to TXOUT 5

V

DIRMD1

V

DIRMD1

V

DIRMD1

RXIN fed by an OOK

2.176MHz sinusoidal signal with 50% duty cycle (Note 9)

to T

MIN

= 0V (38.4kbps), V = 3.3V (115.2kbps)

= V = 3.3V, V = 0V, V

, unless otherwise specified. XTAL frequency 8.704MHz ±30ppm.

MAX

DIRMD1

= 0V (9.6kbps) 1667

DIRMD2

= V

= 3.3V,

DIRMD1

= 0V (38.4kbps) 417

= 3.3V (115.2kbps) 137

RXIN = 0dBm -7.5

RXIN = -10dBm +2

= 0V 8.9 11

DIRMD2

= 0V,

270 ns

5.5 11

20 ns

Q10

Fs

%

Note 2: All devices are 100% production tested at TA = +25°C. Specification over temperature limits are guaranteed by design. Note 3: Defined as DV Note 4. Defined as DV Note 5: Guaranteed by design. Note 6: See the Transmission Output Power section for external resistor values. Note 7: Guaranteed by design with a recommended 470pF capacitor between RXIN and ground. Measurements above 150MHz

are determined by setup.

Note 8: See Figure 1. Note 9: Q2µs envelope rise/fall.

/DVCC at DC.

RXIN

/DVCC at DC.

TXOUT

4 ______________________________________________________________________________________

AISG Integrated Transceiver

Typical Operating Characteristics

(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 = T

MIN

to T

, unless otherwise specified.)

MAX

MAX9947

QUIESCENT CURRENT vs. SUPPLY VOLTAGE

25

TXIN = V

L

23

21

19

QUIESCENT CURRENT (mA)

17

15

3.0 5.5 SUPPLY VOLTAGE (V)

MAXIMUM TRANSMITTER OUTPUT

LEVEL vs. SUPPLY VOLTAGE

14

12

10

8

6

4

TRANSMITTER OUTPUT (dBm)

2

QUIESCENT CURRENT

30

TXIN = V

L

MAX9947 toc01

27

24

VCC = 5.0V

21

QUIESCENT CURRENT (mA)

18

5.04.54.03.5

15

-40 85 TEMPERATURE (°C)

VCC = 3.0V

603510-15

MAX9947 toc02

TRANSMITTER OUTPUT (dBm)

MAXIMUM TRANSMITTER OUTPUT

LEVEL vs. TEMPERATURE

14

vs. TEMPERATURE

MAX9947 toc04

13

12

11

TRANSMITTER OUTPUT (dBm)

VCC = 5.0V

VCC = 3.0V

MAX9947 toc05

TRANSMITTER OUTPUT (dBm)

TRANSMITTER OUTPUT vs. V

14

12

10

8

6

4

2

0

0.7 1.5 V

RES

1.31.10.9

(V)

TRANSMITTER OUPUT SPECTRUM

vs. FREQUENCY (9.6kbps)

20

0

-20

-40

-60

-80

-100

90% DUTY CYCLE C

= 470pF

F

RES

MAX9947 toc03

MAX9947 toc06

0

3.0 5.5 SUPPLY VOLTAGE (V)

TRANSMITTER OUPUT SPECTRUM

vs. FREQUENCY (9.6kbps)

20

0

-20

-40

-60

-80

TRANSMITTER OUTPUT (dBm)

-100

-120 0 25

90% DUTY CYCLE CF = 470pF

FREQUENCY (MHz)

_______________________________________________________________________________________ 5

5.04.54.03.5

10

-40 85 TEMPERATURE (°C)

603510-15

TRANSMITTER OUPUT SPECTRUM

vs. FREQUENCY (38.4kbps)

20

0

MAX9947 toc07

-20

-40

-60

-80

TRANSMITTER OUTPUT (dBm)

-100

2015105

-120

0.1 1000

90% DUTY CYCLE C

= 470pF

F

FREQUENCY (MHz)

100101

-120

0.1 1000

TRANSMITTER OUPUT SPECTRUM

20

MAX9947 toc08

0

-20

-40

-60

-80

TRANSMITTER OUTPUT (dBm)

-100

-120 0 25

100101

FREQUENCY (MHz)

vs. FREQUENCY (38.4kbps)

90% DUTY CYCLE CF = 470pF

2015105

FREQUENCY (MHz)

MAX9947 toc09

AISG Integrated Transceiver

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 = T

MIN

to T

, unless otherwise specified.)

MAX

TRANSMITTER OUPUT SPECTRUM

vs. FREQUENCY (115.2kbps)

20

MAX9947

0

-20

-40

-60

-80

TRANSMITTER OUTPUT (dBm)

-100

-120

0.1 1000 FREQUENCY (MHz)

0

-10

-20

-30

-40

PSRR (dB)

-50

-60

-70

-80

0

TRANSMITTER OUPUT SPECTRUM

90% DUTY CYCLE C

= 470pF

F

100101

20

MAX9947 toc10

0

-20

-40

-60

-80

TRANSMITTER OUTPUT (dBm)

-100

-120 0 25

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

TXIN = V

L

0.01 100,000 FREQUENCY (kHz)

10,00010000.1 1 10 100

RECEIVER INPUT THRESHOLD

vs. TEMPERATURE

vs. FREQUENCY (115.2kbps)

90% DUTY CYCLE C

= 470pF

F

2015105

FREQUENCY (MHz)

20

18

MAX9947 toc13

16

14

12

10

RECEIVER INTPUT IMPEDANCE (kI)

400

TRANSMITTER OUPUT IMPEDANCE

vs. FREQUENCY

25

MAX9947 toc11

20

15

10

5

TRANSMITTER OUTPUT IMPEDANCE (I)

0

0.01 100 FREQUENCY (MHz)

RECEIVER INPUT IMPEDANCE

vs. FREQUENCY

8

6

4

2

0

0.1 10,000 FREQUENCY (kHz)

1000100101

DIR TO RECEIVER OUTPUT DELAY

vs. TEMPERATURE

MAX9947 toc12

1010.1

MAX9947 toc14

-4

-8

-12

-16

RECEIVER INPUT THRESHOLD (dBm)

-20

-40 85

RXOUT = STABLE LOW

RXOUT = STABLE HIGH

TEMPERATURE (°C)

603510-15

MAX9947 toc15

380

360

340

320

DIR TO RECEIVER OUTPUT DELAY (ns)

300

-40 85 TEMPERATURE (°C)

603510-15

6 ______________________________________________________________________________________

MAX9947 toc16