Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX19790ETX+

_______________________________________________________________ Maxim Integrated Products 1

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.

250MHz to 4000MHz Dual,

Analog Voltage Variable Attenuator

MAX19790

19-5165; Rev 0; 3/10

General Description

The MAX19790 dual, general-purpose analog voltage

variable attenuator (VVA) is designed to interface with

50I systems operating in the 250MHz to 4000MHz fre-

quency range. Each attenuator includes a control circuit

that provides 22dB of attenuation range with a linear

control slope of 10dB/V.

Both attenuators share a common analog control and

can be cascaded together to yield 44dB of total dynamic

range, with a combined linear control slope of 20dB/V.

The IC is a monolithic device designed on one of Maxim’s

proprietary SiGe BiCMOS processes. The device oper-

ates from a single +5.0V supply and is available in a com-

pact, 36-pin thin QFN package (6mm x 6mm x 0.8mm)

with an exposed pad. Electrical performance is guaran-

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

Applications

Broadband System Applications, Including

Wireless Infrastructure Digital and Spread-

Spectrum Communication Systems

WCDMA/LTE, TD-SCDMA/TD-LTE, WiMAX™,

cdma2000

, GSM/EDGE, and MMDS Base

Stations

VSAT/Satellite Modems

Microwave Terrestrial Links

Lineup Gain Trim

Temperature Compensation Circuits

Automatic Level Control (ALC)

Transmitter Gain Control

Receiver Gain Control

General Test Equipment

Features

S 250MHz to 4000MHz RF Frequency Range

Integrates Two Analog Attenuators in One

Monolithic Device

Flexible Attenuation-Control Ranges

22dB (per Attenuator)

44dB (Both Attenuators Cascaded)

2.4dB 1500MHz Insertion Loss (per Attenuator)

Linear dB/V Analog Control Response Curve

Simplifies Automatic Leveling Control and

Gain-Trim Algorithms

Excellent Attenuation Flatness Over Wide

Frequency Ranges and Attenuation Settings

S Low 7.3mA Supply Current

Single +5.0V Supply Voltage

Ordering Information

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

*EP = Exposed pad.

T = Tape and reel.

WiMAX is a trademark of WiMAX Forum.

cdma2000 is a registered trademark of Telecommunications

Industry Association.

PART TEMP RANGE PIN-PACKAGE

MAX19790ETX+

-40NC to +85NC

36 Thin QFN-EP*

MAX19790ETX+T

-40NC to +85NC

36 Thin QFN-EP*

Summary of content (11 pages)

PAGE 1
9-5165; Rev 0; 3/10 250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator The MAX19790 dual, general-purpose analog voltage variable attenuator (VVA) is designed to interface with 50I systems operating in the 250MHz to 4000MHz frequency range. Each attenuator includes a control circuit that provides 22dB of attenuation range with a linear control slope of 10dB/V.
PAGE 2
MAX19790 250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator Absolute Maximum Ratings VCC to GND...........................................................-0.3V to +5.5V CTRL to GND (with VCC = +5.0V applied)............. 0V to +4.75V All Other Pins to GND............................... -0.3V to (VCC + 0.3V) RF Input.......................................................................... +20dBm Current into CTRL Pin (VCC grounded)..............................40mA Maximum Junction Temperature.....
PAGE 3
250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator (MAX19790 Evaluation Kit, line and connector losses included, two attenuators in cascade, VCC = 4.75V to 5.25V, RF ports are driven from 50I sources, input PRF = -10dBm, fRF = 950MHz to 2150MHz, VCTRL = +1.0V, TC = -40°C to +85°C. Typical values are for TC = +25°C, VCC = +5.0V, input PRF = -10dBm, fRF = 1500MHz, VCTRL = +1.0V, unless otherwise noted.) PARAMETER Insertion Loss SYMBOL IL TC = +25NC TYP MAX 950MHz to 1500MHz MIN 4.4 6.
PAGE 4
Typical Operating Characteristics (MAX19790 Evaluation Kit, two attenuators in cascade, VCC = +5.0V, PRF = -10dBm, TC = +25NC, VCTRL = +1.0V, unless otherwise noted.) SUPPLY CURRENT vs. VCC INPUT MATCH vs. RF FREQUENCY TC = +85°C 7.0 -10 S22 (dB) TC = -40°C -20 MAX19790 toc03 -10 0 MAX19790 toc02 MAX19790 toc01 TC = +85°C TC = +25°C 7.5 OUTPUT MATCH vs. RF FREQUENCY 0 S11 (dB) SUPPLY CURRENT (mA) 8.0 TC = +85°C TC = -40°C -20 TC = -40°C -30 TC = +25°C -30 TC = +25°C 5.125 -40 5.
PAGE 5
250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator 35 30 40 35 30 1500MHz 2150MHz TC = -40°C 25 PIN = -10dBm/TONE 950MHz INPUT IP3 (dBm) TC = +85°C MAX19790 toc10 fRF = 950MHz PIN = -10dBm/TONE 40 INPUT IP3 (dBm) INPUT IP3 vs. VCTRL 45 MAX19790 toc11 INPUT IP3 vs. VCTRL 45 25 TC = +25°C 20 20 2 4 3 1 2 VCTRL (V) INPUT IP2 vs.
PAGE 6
Typical Operating Characteristics (continued) (MAX19790 Evaluation Kit, one attenuator connected, VCC = +5.0V, PRF = -10dBm, TC = +25NC, VCTRL = +1.0V, unless otherwise noted.) INPUT MATCH vs. RF FREQUENCY 7.0 S22 (dB) -20 -30 TC = -40°C -10 TC = +25°C TC = +25°C 7.5 0 MAX19790 toc17 MAX19790 toc16 TC = +85°C -10 S11 (dB) TC = +85°C -20 -30 TC = -40°C -40 -40 TC = -40°C 4.875 5.000 5.125 5.250 -50 0 1000 VCC (V) INSERTION LOSS vs.
PAGE 7
250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator INPUT IP3 vs. VCTRL 35 30 TC = +25°C TC = -40°C 25 PIN = -10dBm/TONE 1500MHz 40 INPUT IP3 (dBm) 35 950MHz 30 25 2150MHz TC = +85°C 20 20 2 1 3 4 2 1 VCTRL (V) INPUT IP2 vs. VCTRL fRF = 950MHz PIN = -10dBm/TONE TC = +85°C 80 TC = +25°C 70 PIN = -10dBm/TONE 90 INPUT IP2 (dBm) INPUT IP2 (dBm) 90 4 INPUT IP2 vs.
PAGE 8
250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator GND GND GND GND GND GND GND TOP VIEW GND GND MAX19790 Pin Configuration/Functional Diagram 27 26 25 24 23 22 21 20 19 GND GND 30 VCC GND 32 GND IN_B 34 GND 36 MAX19790 29 ATTEN_B 31 ATTENUATIONCONTROL CIRCUITRY 33 18 GND 17 16 GND GND 15 GND 14 11 GND VCC GND CTRL 10 GND 13 12 ATTEN_A 35 *EP 2 3 4 5 6 7 VCC GND GND GND 1 OUT_A GND GND + 8 9 GND 28 IN_A GND OUT_B THIN QFN *EXPOSED PAD.
PAGE 9
250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator The MAX19790 is a dual, general-purpose analog voltage variable attenuator (VVA) designed to interface with 50I systems operating in the 250MHz to 4000MHz frequency range. Each attenuator includes a control circuit that provides 22dB of attenuation range with a linear control slope of 10dB/V.
PAGE 10
Exposed Pad RF and Thermal Considerations The EP MUST be soldered to a ground plane on the PCB, either directly or through an array of plated via holes. Soldering the pad to ground is also critical for efficient heat transfer. Use a solid ground plane wherever possible. The exposed pad (EP) of the device’s 36-pin thin QFN package provides a low thermal-resistance path to the die. It is important that the PCB on which the IC is mounted be designed to conduct heat from this contact.
PAGE 11
250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator Package Information For the latest package outline information and land patterns, 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 Document No.