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General Description

The MAX3580 fully integrated, direct-conversion TV tuner

is designed for Digital Video Broadcasting-Terrestrial

(DVB-T) applications. The integrated tuner covers a

170MHz to 230MHz input frequency range for the VHF-III

band and 470MHz to 878MHz for the UHF band.

The MAX3580 direct-conversion tuner integrates an RF

input switch and a multiband tracking filter, allowing

low-power tuner-on-board applications without the cost

and power-dissipation issues of dual-conversion tuner

solutions. The zero-IF architecture eliminates the need

for SAW filters by providing baseband I and Q outputs

directly to the demodulator. In addition, DC-offset can-

cellation is implemented on-chip using a mixed-signal

architecture to improve the second-order distortion per-

formance and the dynamic range of the downstream

digitizer and demodulator.

The MAX3580 features dynamic gain control of more

than 76dB and a typical midband noise figure of 4.7dB

referred to the LNA input. The VCO architecture opti-

mizes both in-band and wideband phase noise for

OFDM applications where sensitivity to both 1kHz

phase noise and wideband phase noise related to

strong adjacents can be a problem.

The MAX3580 communicates using a 2-wire serial bus.

The device operates from a typical +3.3V power supply

and dissipates 650mW. The MAX3580 is available in a

small 32-pin thin QFN package (5mm x 5mm) with an

exposed paddle. Electrical performance is guaranteed

over the extended -40°C to +85°C temperature range.

Applications

Digital Televisions

Digital Terrestrial Set-Tops

Laptop Televisions

Automotive Televisions

USB Peripherals

Features

o 650mW Power Dissipation (at V

= +3.3V)

o I and Q Baseband Outputs Eliminate All IF-SAW

Filters

o Integrated RF Tracking Filters

o Tunable Baseband Lowpass Filters

o Full-Band VHF-III and UHF Tuning

o +38dB Digital ACPR, +47dB Analog ACPR

o Low Noise Figure: 4.7dB (typ)

o Frac-N Synthesizer for -90dBc/Hz Close-In

Phase Noise

o Baseband Overload Detector Controls RF AGC if

Desired

o +3.1V to +3.5V Supply Voltage Range

o Ultra-Small, 5mm x 5mm Thin QFN Package

MAX3580

Direct-Conversion TV Tuner

________________________________________________________________

Maxim Integrated Products

PART TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX3580ETJ+ -40°C to +85°C 32 TQFN-EP* T3255-5

MAX3580ETJ+T -40°C to +85°C 32 TQFN-EP* T3255-5

Pin Configuration/

Functional Diagram

Ordering Information

TRACKING

FILTER

GND_TUNE

LDO

VCC_VCO

MUX

RFIN2

ADDR2

LEXT

VCC_SYN

RFIN

RF_AGC

SCL

SDA

BBI-

BBQ-

BBQ+

BB_AGC

BBI+

VCC_BB

REF_BUFF

VCC_RF

OVLD_DET

IND1

IND2

VCC_XTAL

VTUNE

OVLD_DET

GND_LNA

GND_CP

GND_PLL

N.C.

TOP VIEW

32 28

293031

1611 12

MAX3580

DAC

CHARGE

PUMP

SERIAL INTERFACE, CONTROL,

AND

SYNTHESIZER

19-0611; Rev 0; 7/06

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.

EP = Exposed paddle.

Denotes lead-free package.

= Tape-and-reel package.

EVALUATION KIT

AVAILABLE

Summary of content (21 pages)

PAGE 1
9-0611; Rev 0; 7/06 KIT ATION EVALU E L B A AVAIL Direct-Conversion TV Tuner o I and Q Baseband Outputs Eliminate All IF-SAW Filters o Integrated RF Tracking Filters o Tunable Baseband Lowpass Filters o Full-Band VHF-III and UHF Tuning o +38dB Digital ACPR, +47dB Analog ACPR o Low Noise Figure: 4.7dB (typ) o Frac-N Synthesizer for -90dBc/Hz Close-In Phase Noise o Baseband Overload Detector Controls RF AGC if Desired o +3.1V to +3.
PAGE 2
MAX3580 Direct-Conversion TV Tuner ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +3.6V SDA, SCL, ADDR2, MUX, REF_BUFF, BB_AGC, RF_AGC to GND ................................-0.3V to +3.6V All Other Pins to GND ..............................-0.3V to (+VCC + 0.3V) RF Input Power ...............................................................+10dBm Operating Temperature Range ...........................-40°C to +85°C Junction Temperature .............
PAGE 3
Direct-Conversion TV Tuner (MAX3580 EV kit, VCC = +3.1V to +3.5V, GND = 0V. RF_AGC = BB_AGC = +2.85V, RF input terminated into a 75Ω load, BBI_ and BBQ_ loaded by RL greater than 2kΩ and CL less than 10pF, VCO active, registers are set according to the recommended default register conditions, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.
PAGE 4
MAX3580 Direct-Conversion TV Tuner AC ELECTRICAL CHARACTERISTICS (continued) (MAX3580 EV kit, VCC = +3.1V to +3.5V, GND = 0V. RF_AGC = BB_AGC = +2.85V, RF input terminated into a 75Ω load, BBI_ and BBQ_ loaded by RL greater than 2kΩ and CL less than 10pF, VCO active, registers are set according to the recommended default register conditions, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.
PAGE 5
Direct-Conversion TV Tuner (MAX3580 EV kit, VCC = +3.1V to +3.5V, GND = 0V. RF_AGC = BB_AGC = +2.85V, RF input terminated into a 75Ω load, BBI_ and BBQ_ loaded by RL greater than 2kΩ and CL less than 10pF, VCO active, registers are set according to the recommended default register conditions, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL Rejection Ratio CONDITIONS MIN At 5.25MHz (UHF mode) 23 At 4.
PAGE 6
MAX3580 Direct-Conversion TV Tuner Performance to Standards The following is selected overall performance data for the MAX3580 + digital demodulator. NorDig refers to standard Unified 1.0.2 available from www.nordig.org. Table 1 shows the typical overall performance as measured using the MAX3580 and one current production DVB-T demodulator. This reference design is available in NIM card form factor upon request. MBRAI refers to standard MBRAI 04-102 IEC 62002-1 available from www.ansi.org.
PAGE 7
Direct-Conversion TV Tuner 100 110 MAX3580 toc02 110 MAX3580 toc01 110 80 TA = +55°C TA = +25°C GAIN (dB) GAIN (dB) TA = +85°C 80 TA = -40°C 90 TA = 0°C 90 BB_AGC = 2.85V 100 100 TA = +25°C GAIN (dB) VOLTAGE GAIN vs. RF_AGC CONTROL VOLTAGE UHF BAND VOLTAGE GAIN vs. FREQUENCY MAX3580 toc03 VHF-III BAND VOLTAGE GAIN vs.
PAGE 8
Typical Operating Characteristics (continued) (Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.) UHF MODE NOISE FIGURE vs. VOLTAGE GAIN VOLTAGE GAIN vs. BB_AGC CONTROL VOLTAGE TA = -40°C 70 TA = +25°C, +55°C 60 50 TA = +85°C 40 -20 -30 -40 -50 -70 fRF = 620MHz BB_AGC = 2.85V 0 65 70 75 80 85 -90 10 -100 90 0 0.5 1.0 1.5 2.0 2.
PAGE 9
Direct-Conversion TV Tuner BB_BW <3:0> = "1011" 8MHz CHANNEL MODE -65 20 TA = +85°C 10 5 10 20 30 40 TA = +85°C 10 TA = -40°C TA = +25°C TA = +25°C 0 0 50 0.5 1.0 1.5 2.0 2.5 0 3.0 0.5 1.0 1.5 2.0 2.5 FREQUENCY (MHz) BB_AGC VOLTAGE (V) BB_AGC VOLTAGE (V) RF PORT-TO-PORT ISOLATION POWER-DETECTOR OUTPUT VOLTAGE vs. RF INPUT POWER RF INPUT RETURN LOSS vs.
PAGE 10
Direct-Conversion TV Tuner MAX3580 Pin Description 10 PIN NAME 1 SDA Serial-Data Input Line. Requires a pullup resistor to VCC. FUNCTION 2 SCL Serial-Clock Input. Requires a pullup resistor to VCC. 3 RFIN2 Second RF Input 4 RFIN First RF Input 5 ADDR2 6 GND_LNA 7 VCC_RF 8 LEXT 9 RF_AGC 10 IND1 11 IND2 VHF Inductor Pin 2. Keep traces to inductor as short as possible. 12 N.C.
PAGE 11
Direct-Conversion TV Tuner REF_BUFF 32 31 30 28 29 26 27 25 CHARGE PUMP 1 SDA GND_CP VCC_SYN VCC GND_PLL MUX VCC_XTAL XE XB VCC 24 CP MAX3580 2 SCL RFIN2 RFIN 23 SERIAL INTERFACE, CONTROL, AND SYNTHESIZER 3 4 22 LO 21 DAC LDO GND_TUNE VTUNE OVLD_DET ADDR2 GND_LNA VCC VCC_RF 5 20 6 19 TRACKING FILTER 0 90 VCC_VCO VCC BB_AGC LO 18 7 BBI+ I CHANNEL 17 8 15 BBQVCC BBI- 16 BBQ+ 14 VCC_BB 13 OVLD_DET 12 N.C.
PAGE 12
MAX3580 Direct-Conversion TV Tuner Detailed Description Programmable Registers The MAX3580 includes thirteen write/read registers and three read-only registers. See Table 2 for register configuration and the Register Description section. The register configuration of Table 2 shows each bit name and the bit usage information for all registers. “U” labeled under each bit name indicates that the bit value is user defined to meet specific application requirements.
PAGE 13
Direct-Conversion TV Tuner N-Divider Integer (Register Address 0x00) N<7:0>: VCO Integer-N Divider Ratio N-Divider Frac2 (Register Address 0x01) MP: Minimum CP Pulse Width. Always set to 0 (factory use only). LI1, LI0; CP Linearity Control. Always set to 00 (factory use only). INT: Integer Mode ON/OFF. Set to 0 for normal operation.
PAGE 14
MAX3580 Direct-Conversion TV Tuner Shutdown Control (Register Address 0x08) SHDN_BG: Main Bandgap 0 = Enabled 1 = Disabled The main bandgap can and will be shut down once all other blocks are shut down (i.e., all bits in this shutdown register and bits VCO_ in the VCO Control Register and bits DC_MO_ in the DC Offset Control Register are shut down).
PAGE 15
Direct-Conversion TV Tuner VASA, VASE: VCO Autotuner Status* LD: PLL Lock Detector 0 = PLL unlocked Tracking Filter ROM Address (Register Address 0x0D) TFA<3:0>: Tracking Filter ROM Address. See Table 3.
PAGE 16
MAX3580 Direct-Conversion TV Tuner To Read Back Fuses IMPORTANT NOTICE: When reading other addresses than 8’h00 (the system trim bits), it is possible that the data going to the bias cells will be disturbed due to the architecture of the fuse bank. This means the bias current could change while reading back fuse data. 1) Write 8’hXX to TFA. XX is the address of the fuse column you want to read. 2) Read 8’hXX from TFR. TFR is the Tracking Filter Read Register. 3) Repeat steps 1 and 2 for other addresses.
PAGE 17
Direct-Conversion TV Tuner START WRITE DEVICE ADDRESS R/ W 1100000 0 ACK WRITE REGISTER ADDRESS ACK Read Cycle When addressed with a read command, the MAX3580 allows the master to read back a single register or multiple successive registers. A read cycle begins with the bus master issuing a START condition followed by the 7 slave address bits and a write bit (R/W = 0). The MAX3580 issues an ACK if the slave address byte is successfully received.
PAGE 18
MAX3580 Direct-Conversion TV Tuner Applications Information Band Selection The MAX3580 is designed to be suitable for operation in the 170MHz to 230MHz VHF-III band and in the 470MHz to 878MHz UHF band. RF Inputs A switch selects either RFIN or RFIN2 as the input to the single-ended broadband matched LNA. This switch is programmed through the RFS bit (bit 5) of register 0x05. The LNA provides a continuous gain control range of typically 50dB before the signal is downconverted.
PAGE 19
Direct-Conversion TV Tuner When tuning the MAX3580 to a given Rx frequency, the correct capacitor value has to be calculated using the following linear formulas and written to the appropriate registers. This is in addition to programming the PLL with the desired frequency. The formulas differ for VHF and UHF bands but are the same for all three capacitor values.
PAGE 20
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) QFN THIN.
PAGE 21
Direct-Conversion TV Tuner Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 21 © 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.