MAXIM MAX2140 Technical data

General Description

The MAX2140 complete receiver is designed for satellite digital audio radio services (SDARS). The device includes a fully monolithic VCO and only needs a SAW at the IF and a crystal to generate the reference frequency.

To form a complete SDARS radio, the MAX2140 requires only a low-noise amplifier (LNA), which can be controlled by a baseband controller. The small number of external components needed makes the MAX2140based platform the lowest cost and the smallest solution for SDARS.

The receiver includes a self-contained RF AGC loop and baseband-controlled IF AGC loop, effectively providing a total dynamic range of over 92dB.

Channel selectivity is ensured by the SAW filter and by on-chip monolithic lowpass filters.

The fractional-N PLL allows a very small frequency step, making possible the implementation of an AFC loop. Additionally, the reference is provided by an external XTAL and on-chip oscillator. A reference buffer output is also provided.

A 2-wire interface (I

C-bus compatible) programs the circuit for a wide variety of conditions, providing features such as:

•Programmable gains

•Lowpass filters tuning

•Individual functional block shutdown

The MAX2140 minimizes the requirement on the baseband controller. No compensation or calibration procedures are required. The device is available in a 7mm

7mm 44-pin thin QFN package.

Applications

Satellite Digital Audio Radio Services (SDARS)

2.4GHz ISM Radios

Features

♦ Integrated Receiver, Requires Only One SAW

Filter

♦ Self-Contained RF AGC Loop

♦ Differential I/Q Interface

♦ Complete Integrated Frequency Generation

♦ Bias Supply for External LNAs

♦ Overcurrent Protection

♦ Low-Power Standby Mode

♦ Very Small 44-Pin Thin QFN Package

MAX2140

Complete SDARS Receiver

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3123; Rev 3; 10/05

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

EVALUATION KIT

AVAILABLE

PART TEMP RANGE

PIN-PACKAGE

MAX2140ETH

-40°C to +85°C

44 Thin QFN-EP*

MAX2140ETH+

-40°C to +85°C

44 Thin QFN-EP*

MAX2140

IF2QO-

SCL

IF2QI-

IF2QO+

RFAGC_C

VCC_FE0

RFIN-

XM TUNER

CA1

CA2

SDA

IFOUT-

IFOUT+

VCC_FE1

RFIN+

CHP

1/N

1/R

/4/8

QUAD

PFD

IF2II-

IF2IO+

IF2IO-

IF2II+

VINANT

VOUTANT

VCC_BE1

13 14 15

VCC_BE2

IOUT-

IOUT+

2019 2212 18

353637 3438394041424344

VCC_FE2

IFIN-

IFIN+

IF2QI+

VCC_FE3

QOUT-

QOUT+

VCC_D

VCC_BE4

VCC_A

LOCK

CPOUT

VCCREG

REFOUT

VCC_XTAL

XTAL

VTUNE

VCC_BE3

AGCPWM

LPF HPF

AGC

VCC_VCO

Σ Δ - MOD

ACTUAL SIZE

7mm x 7mm

Block Diagram/Pin Configuration

*EP = Exposed paddle. +Denotes lead-free package.

MAX2140

Complete SDARS Receiver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= 3.1V to 3.6V; VINANT ≥ VCC, VOUTANT in open circuit, TA= -40°C to +85°C. Typical values are at VCC= 3.3V, VINANT =

3.3V, and T

= +25°C, unless otherwise noted.) (Note 1)

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.

CC_XX

to GND..................................................... -0.3V to +4.3V

VINANT to GND.................................................... -0.3V to +5.6V

AGCPWM to GND ................................................ -0.3V to +3.0V

Digital Input Current ........................................................ ±10mA

Maximum VSWR Without Damage ........................................ 4:1

Maximum VSWR Without Oscillations ................................... 4:1

All Other Pins ............................................... -0.3V to V

+ 0.3V

Continuous Power Dissipation (T

= +70°C)

44-Pin TQFN (derate 26.31mW/°C above +70°C) ... 2105mW

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

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

Theta J

..........................................................................12°C/W

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

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

CAUTION! ESD SENSITIVE DEVICE

Supply Voltage Range (Note 2)

Operating Supply Current

Lock Indicator High (Locked) V

Lock Indicator Low (Unlocked) V

Digital Input-Logic High V

Digital Input-Logic Low V

Input Current for Digital Control Pins

Input Current for AGCPWM I

Voltage Drop VINANT to VOUTANT in Normal Operating Mode

Current Sink at VOUTANT to Flag Bit ACP = 1

Current Sink at VOUTANT to Flag Bit AND = 1

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VINANT 3.1 3.3 5.3

SHDN

IH_LK

IL_LK

DIG

AGCPWM

ANTDC-

DROP

ANTDC_H

ANTDC_L

All blocks on 150 180 mA

All blocks off 30 µA

Maximum current sink at VOUTANT is 150mA

VOUTANT shorted to ground (Note 4) 195 500 mA

VCC - 0.5 V

3.1 3.3 3.6

0.5 V

-1 +1 µA

-10 +290 µA

0.35 V

12 20 30 mA

MAX2140

Complete SDARS Receiver

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2140 EV kit, current drawn at VOUTANT, I

VOUTANT

= 150mA max, VCC= 3.1V to 3.6V, VINANT = 3.1V to 5.3V, fRF= 2320MHz

to 2345MHz, f

= 2076MHz, TA= -40°C to +85°C. Typical values are at VCC= VINANT = 3.3V, fRF= 2338MHz, TA= +25°C, unless

otherwise noted.) (Note 2)

Interstage (IF) 259MHz SAW filter specification: insertion loss = 19dB max, 9.3MHz to 12MHz from center attenuation = 24dB min, beyond 12MHz from center attenuation = 40dB min.

GENERAL RECEIVER

Minimum Input RF Power to Produce 20mV I and Q Baseband Outputs

Maximum Input RF Power to Produce 400mV at I and Q Baseband Outputs

LO to RF Input Leakage

Noise Figure (Notes 3, 5) NF

In-Band Input IP3 (Notes 5, 6) I_IIP3

Out-of-Band Input IP3 (Notes 5, 7)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

(Differential) at

P-P

(Differential)

P-P

O_IIP3

MIN

MAX

LK_H

LK_L

IF AGC is set at maximum gain, bit HPF = 0 (Note 4)

RF AGC threshold: RF_AGC_TRIP =

-17dBm; IF AGC is set at minimum gain, bit HPF = 0

LO-related spurious > 2GHz -66

LO-related spurious < 2GHz -38

RF AGC is at maximum gain, IF AGC is at reference gain

RF AGC is at maximum gain, IF AGC is at reference gain -10dB

RF AGC is at maximum gain -5dB, IF AGC is at reference gain

RF AGC is at maximum gain -10dB, IF AGC is at reference gain

RF AGC is at maximum gain, IF AGC is at reference gain

RF AGC is at maximum gain, IF AGC is at reference gain -5dB

RF AGC is at maximum gain -30dB, IF AGC is at reference gain -43dB

RF AGC is at maximum gain -20dB, IF AGC is at reference gain -53dB

RF AGC is at maximum gain, IF AGC is at reference gain

RF AGC is at maximum gain -7dB, IF AGC is at reference gain

RF AGC is at maximum gain -25dB, IF AGC is at reference gain

-91 -84 dBm

+3 dBm

8.5 10.4

9.3 11.7

13.3 15.5

17.8 21.5

-32

-27

-9

-3

+12

dBm

MAX2140

Complete SDARS Receiver

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2140 EV kit, current drawn at VOUTANT, I

VOUTANT

= 150mA max, VCC= 3.1V to 3.6V, VINANT = 3.1V to 5.3V, fRF= 2320MHz

to 2345MHz, f

= 2076MHz, TA= -40°C to +85°C. Typical values are at VCC= VINANT = 3.3V, fRF= 2338MHz, TA= +25°C, unless

otherwise noted.) (Note 2)

Interstage (IF) 259MHz SAW filter specification: insertion loss = 19dB max, 9.3MHz to 12MHz from center attenuation = 24dB min, beyond 12MHz from center attenuation = 40dB min.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

In-Band Input IP2 (Notes 5, 6) I_IIP2

Out-of-Band Input IP2 (Notes 5, 7)

Opposite Sideband Rejection OSR Baseband frequencies = 100kHz (Note 4) 32 39 dB

Image Rejection IRej At f

Half IF Rejection HRej At fLO + 0.5 x f

RF AGC LOOP

LNA Gain Reduction

Minimum RF AGC Trip Point RFAGC_min Bits RF4/3/2/1/0 = 00000 (BIN) -35 dBm

RF AGC Trip Point RFAGC_int Bits RF4/3/2/1/0 = 00010 (BIN) (Note 4) -37 -33 -29 dBm

Maximum RF AGC Trip Point RFAGC_max Bits RF4/3/2/1/0 = 10100 (BIN) -15 dBm

FRONT-END (FE) PROGRAMMABLE GAIN

FE Programmable Gain Range FE_Rge (Note 4) 19 22 26 dB

FE Programmable Gain Step FE_Step 2 dB

IF FILTER INTERFACE

IF Output Differential Admittance Yout, IF

Input Differential Impedance Presented by the IC to the IF Filter Output

IF AGC LOOP

IF AGC Control Voltage for Max Gain

IF AGC Control Voltage for Min Gain

O_IIP2

RFAGC_

Range

Zin, IF

IFAGC_VM Applied at pin AGCPWM 0.2 V

IFAGC_Vm Applied at pin AGCPWM 2.5 V

RF AGC is at maximum gain, IF AGC is at reference gain

RF AGC is at maximum gain, IF AGC is at reference gain -5dB

RF AGC is at maximum gain, IF AGC is at reference gain -25dB

RF AGC is at maximum gain, IF AGC is at reference gain

RF AGC is at maximum gain -7dB, IF AGC is at reference gain

RF AGC is at maximum gain -25dB, IF AGC is at reference gain

- f

(Note 4) 30 42 dB

Between pins IFOUT+, IFOUT-, f

= 259MHz and 467MHz

Between pins IFOUT+, IFOUT-, f

= 259MHz and 467MHz

+27

+38

+45

+60

54 dB

53 dB

1/900

+ j0

150 + j0

dBm

Ω

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