MAX9986ETP-T_技术文档

19-3605; Rev 0; 2/05

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

General Description

Features

♦ 815MHz to 995MHz RF Frequency Range

♦ 960MHz to 1180MHz LO Frequency Range

The MAX9986 high-linearity downconversion mixer pro-

vides 10dB gain, +23.6dBm IIP3, and 9.3dB NF for

815MHz to 995MHz base-station receiver applications.

With a 960MHz to 1180MHz LO frequency range, this

particular mixer is ideal for high-side LO injection

receiver architectures. Low-side LO injection is sup-

ported by the MAX9984, which is pin-for-pin and func-

tionally compatible with the MAX9986.

(MAX9986)

♦ 570MHz to 850MHz LO Frequency Range

(MAX9984)

♦ 50MHz to 250MHz IF Frequency Range

♦ 10dB Conversion Gain

♦ +23.6dBm Input IP3

In addition to offering excellent linearity and noise perfor-

mance, the MAX9986 also yields a high level of compo-

nent integration. This device includes a double-balanced

passive mixer core, an IF amplifier, a dual-input LO selec-

table switch, and an LO buffer. On-chip baluns are also

integrated to allow for single-ended RF and LO inputs.

The MAX9986 requires a nominal LO drive of 0dBm, and

supply current is guaranteed to be below 265mA.

♦ +12dBm Input 1dB Compression Point

♦ 9.3dB Noise Figure

♦ 67dBc 2LO-2RF Spurious Rejection at

P

= -10dBm

RF

♦ Integrated LO Buffer

♦ Integrated RF and LO Baluns for Single-Ended

Inputs

The MAX9984/MAX9986 are pin compatible with the

MAX9994/MAX9996 1700MHz to 2200MHz mixers,

making this entire family of downconverters ideal for

applications where a common PC board layout is used

for both frequency bands. The MAX9986 is also func-

tionally compatible with the MAX9993.

♦ Low -3dBm to +3dBm LO Drive

♦ Built-In SPDT LO Switch with 49dB LO1 to LO2

Isolation and 50ns Switching Time

♦ Pin Compatible with MAX9994/MAX9996 1700MHz

to 2200MHz Mixers

The MAX9986 is available in a compact, 20-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.

♦ Functionally Compatible with MAX9993

♦ External Current-Setting Resistors Provide Option

for Operating Mixer in Reduced Power/Reduced

Performance Mode

♦ Lead-Free Package Available

Applications

850MHz W-CDMA Base Stations

Ordering Information

GSM 850/GSM 900 2G and 2.5G EDGE Base

Stations

PKG

CODE

PART

TEMP RANGE PIN-PACKAGE

cdmaOne™ and cdma2000^®Base Stations

20 Thin QFN-EP*

-40°C to +85°C

MAX9986ETP

MAX9986ETP-T

T2055-3

iDEN^®Base Stations

Predistortion Receivers

Fixed Broadband Wireless Access

Wireless Local Loop

Private Mobile Radios

Military Systems

5mm × 5mm

20 Thin QFN-EP*

-40°C to +85°C

T2055-3

5mm × 5mm

20 Thin QFN-EP*

5mm × 5mm

MAX9986ETP+D -40°C to +85°C

20 Thin QFN-EP*

5mm × 5mm

MAX9986ETP+TD -40°C to +85°C

*EP = Exposed paddle.

Microwave Links

Digital and Spread-Spectrum Communication

Systems

+ = Lead free. D = Dry pack. T = Tape-and-reel.

cdma2000 is a registered trademark of the Telecommunications

Industry Association.

cdmaOne is a trademark of CDMA Development Group.

iDEN is a registered trademark of Motorola, Inc.

Pin Configuration/Functional Diagram and Typical

Application Circuit appear at end of data sheet.

________________________________________________________________ Maxim Integrated Products

1

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.

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

ABSOLUTE MAXIMUM RATINGS

V

to GND...........................................................-0.3V to +5.5V

θ

.................................................................................+38°C/W

.................................................................................+13°C/W

CC

JA

JC

IF+, IF-, LOBIAS, LOSEL, IFBIAS to GND...-0.3V to (V

+ 0.3V)

CC

TAP........................................................................-0.3V to +1.4V

LO1, LO2, LEXT to GND........................................-0.3V to +0.3V

RF, LO1, LO2 Input Power .............................................+12dBm

RF (RF is DC shorted to GND through a balun) .................50mA

Operating Temperature Range (Note A) ....T = -40°C to +85°C

C

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

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

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

Continuous Power Dissipation (T = +70°C)

A

20-Pin Thin QFN-EP (derate 26.3mW/°C above +70°C)...........2.1W

Note A: T is the temperature on the exposed paddle of the package.

C

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.

DC ELECTRICAL CHARACTERISTICS

(MAX9986 Typical Application Circuit, V

= +4.75V to +5.25V, no RF signal applied, IF+ and IF- outputs pulled up to V

through

CC

inductive chokes, R = 953Ω, R = 619Ω, T = -40°C to +85°C, unless otherwise noted. Typical values are at V

= +5V, T

=

1

2

C

CC

C

+25°C, unless otherwise noted.)

PARAMETER

Supply Voltage

SYMBOL

CONDITIONS

MIN

TYP

5.00

222

MAX

5.25

265

0.8

UNITS

V

4.75

V

mA

V

CC

Supply Current

I

LO_SEL Input-Logic Low

LO_SEL Input-Logic High

V

IL

V

2

V

IH

AC ELECTRICAL CHARACTERISTICS

(MAX9986 Typical Application Circuit, V

= +4.75V to +5.25V, RF and LO ports are driven from 50Ω sources, P

= -3dBm to

LO

CC

+3dBm, P = -5dBm, f = 815MHz to 995MHz, f = 960MHz to 1180MHz, f = 160MHz, f > f , T = -40°C to +85°C, unless

RF

LO

IF

RF

LO

RF

C

otherwise noted. Typical values are at V

= +5V, P = -5dBm, P = 0dBm, f = 910MHz, f = 1070MHz, f = 160MHz, T

=

CC

RF

LO

IF

C

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

PARAMETER

SYMBOL

CONDITIONS

MIN

815

960

570

50

TYP

MAX

995

1180

850

250

11

UNITS

RF Frequency Range

f

(Note 2)

MAX9984

(Note 2)

MHz

RF

LO Frequency Range

f

MHz

LO

IF Frequency Range

f

IF

MHz

dB

Conversion Gain

G

T

C

= +25°C

9

10

C

Gain Variation Over Temperature

T

= -40°C to +85°C

-0.007

dB/°C

Flatness over any one of three frequency bands:

f

= 824MHz to 849MHz

= 869MHz to 894MHz

= 880MHz to 915MHz

RF

Conversion Gain Flatness

Input Compression Point

0.15

12

dB

P

(Note 3)

dBm

1dB

Two tones:

f

= 910MHz, f

= 911MHz,

RF1

RF2

Input Third-Order Intercept Point

IIP3

21

23.6

P

= -5dBm/tone, f = 1070MHz,

LO

RF

LO

= 0dBm, T = +25°C

A

T

= +25°C to -40°C

= +25°C to +85°C

-1.7

Input IP3 Variation Over

Temperature

C

dB

+1.0

C

2

_______________________________________________________________________________________

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX9986 Typical Application Circuit, V

= +4.75V to +5.25V, RF and LO ports are driven from 50Ω sources, P

= -3dBm to

LO

CC

+3dBm, P = -5dBm, f = 815MHz to 995MHz, f = 960MHz to 1180MHz, f = 160MHz, f > f , T = -40°C to +85°C, unless

RF

LO

IF

LO

RF

C

otherwise noted. Typical values are at V

= +5V, P = -5dBm, P = 0dBm, f = 910MHz, f = 1070MHz, f = 160MHz, T

=

CC

RF

LO

RF

LO

IF

C

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

PARAMETER SYMBOL

Noise Figure

CONDITIONS

MIN

TYP

MAX

UNITS

NF

Single sideband, f = 190MHz

9.3

dB

IF

P

=

f

= 900MHz (no signal)

= 1090MHz

BLOCKER

RF

19

24

+8dBm

LO

Noise Figure Under-Blocking

= 990MHz

dB

BLOCKER

= 190MHz

P

IF

BLOCKER

(Note 4)

+11dBm

P

=

BLOCKER

0.3

2

P

= -5dBm

= 910MHz

= 911MHz

FUNDAMENTAL

+8dBm

Small-Signal Compression

Under-Blocking Condition

dB

f

FUNDAMENTAL

P

BLOCKER

+11dBm

LO Drive

-3

+3

dBm

dBc

P

= -10dBm

= -5dBm

= -10dBm

= -5dBm

67

62

87

77

49

50

-47

-30

46

50

20

RF

2 x 2

3 x 3

2LO-2RF

3LO-3RF

Spurious Response at IF

LO2 selected

LO1 selected

42

P

= +3dBm

LO

LO1 to LO2 Isolation

dB

T

C

= +25°C (Note 5)

LO Leakage at RF Port

LO Leakage at IF Port

RF-to-IF Isolation

P

= +3dBm

dBm

dB

LO

LO Switching Time

RF Port Return Loss

50% of LOSEL to IF settled to within 2°

ns

dB

LO1/2 port selected,

LO2/1 and IF terminated

27

26

22

LO Port Return Loss

dB

LO1/2 port unselected,

LO2/1 and IF terminated

LO driven at 0dBm, RF terminated into 50Ω,

differential 200Ω

IF Port Return Loss

dB

Note 1: All limits include external component losses. Output measurements taken at IF output of the Typical Application Circuit.

Note 2: Operation outside this range is possible, but with degraded performance of some parameters.

Note 3: Compression point characterized. It is advisable not to operate continuously the mixer RF input above +12dBm.

Note 4: Measured with external LO source noise filtered so the noise floor is -174dBm/Hz. This specification reflects the effects of all

SNR degradations in the mixer, including the LO noise as defined in Maxim Application Note 2021.

Note 5: Guaranteed by design and characterization.

_______________________________________________________________________________________

3

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

Typical Operating Characteristics

(MAX9986 Typical Application Circuit, V

= +5.0V, P = 0dBm, P = -5dBm, f > f , f = 160MHz, unless otherwise noted.)

LO RF LO RF IF

CC

CONVERSION GAIN vs. RF FREQUENCY

12

11

10

9

12

11

10

9

T

= -40°C

C

11

10

9

T

= -25°C

C

P

= -3dBm, 0dBm, +3dBm

V

= 4.75V, 5.0V, 5.25V

LO

CC

T

= +25°C

C

= +85°C

C

8

7

890

940

990

740

790

840

1040

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

RF FREQUENCY (MHz)

INPUT IP3 vs. RF FREQUENCY

26

25

24

23

22

21

20

19

26

25

24

23

22

21

20

19

26

25

24

23

22

21

20

19

T

= +85°C

C

V

= 4.75V

CC

P

= +3dBm, 0dBm, -3dBm

LO

V

= 5.0V

V

= 5.25V

CC

T

= +25°C

C

T

= -25°C

C

T

= -40°C

C

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

RF FREQUENCY (MHz)

NOISE FIGURE vs. RF FREQUENCY

12

11

10

9

12

11

10

9

12

11

10

9

IF = 190MHz

T

= +85°C

C

T

= +25°C

C

P

= +3dBm, 0dBm, -3dBm

LO

V

= 4.75V, 5.0V, 5.25V

CC

8

T

= -40°C

C

T

= -25°C

C

7

6

760

820

880

940

1000

760

820

880

940

1000

760

820

880

940

1000

RF FREQUENCY (MHz)

4

_______________________________________________________________________________________

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

Typical Operating Characteristics (continued)

(MAX9986 Typical Application Circuit, V

= +5.0V, P = 0dBm, P = -5dBm, f > f , f = 160MHz, unless otherwise noted.)

LO RF LO RF IF

CC

2LO-2RF RESPONSE vs. RF FREQUENCY

75

70

65

60

55

50

45

75

70

65

60

55

50

45

75

70

65

60

55

50

45

P

= -5dBm

= +3dBm

P

= -5dBm

P

= -5dBm

RF

P

= 0dBm

LO

RF

T

= +85°C

C

V

= 5.25V

P

CC

LO

T

= -40°C, -25°C

C

P

= -3dBm

LO

T

= +25°C

C

V

= 4.75V

CC

V

= 5.0V

CC

990

740

790

840

890

940

1040

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

RF FREQUENCY (MHz)

3LO-3RF RESPONSE vs. RF FREQUENCY

95

90

85

80

75

70

65

60

55

95

90

85

80

75

70

65

60

55

95

90

85

80

75

70

65

60

55

P

= -5dBm

P

= -5dBm

P

= -5dBm

RF

T

= +25°C

C

T

= +85°C

C

P

= -3dBm, 0dBm, +3dBm

V

= 4.75V, 5.0V, 5.25V

LO

CC

T

= -25°C

C

T

= -40°C

C

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

RF FREQUENCY (MHz)

INPUT P

vs. RF FREQUENCY

INPUT P

vs. RF FREQUENCY

INPUT P

vs. RF FREQUENCY

1dB

14

13

12

11

10

9

14

13

12

11

10

9

14

13

12

11

10

9

T

= +25°C

C

V

= 5.25V

CC

T

= +85°C

C

P

= -3dBm, 0dBm, +3dBm

LO

V

= 4.75V

CC

T

= -40°C

= 5.0V

C

T

= -25°C

CC

C

8

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

RF FREQUENCY (MHz)

_______________________________________________________________________________________

5

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

Typical Operating Characteristics (continued)

(MAX9986 Typical Application Circuit, V

= +5.0V, P = 0dBm, P = -5dBm, f > f , f = 160MHz, unless otherwise noted.)

LO RF LO RF IF

CC

LO SWITCH ISOLATION

vs. LO FREQUENCY

LO SWITCH ISOLATION

vs. LO FREQUENCY

LO SWITCH ISOLATION

vs. LO FREQUENCY

60

55

50

45

40

60

55

50

45

40

55

T

= -40°C, -25°C

C

50

45

40

V

= 4.75V, 5.0V, 5.25V

CC

P

= -3dBm, 0dBm, +3dBm

LO

T

= +85°C

C

T

= +25°C

C

900

950

1000 1050 1100 1150 1200

LO FREQUENCY (MHz)

900

950

1000 1050 1100 1150 1200

LO FREQUENCY (MHz)

900

950

1000 1050 1100 1150 1200

LO FREQUENCY (MHz)

LO LEAKAGE AT IF PORT

vs. LO FREQUENCY

LO LEAKAGE AT IF PORT

vs. LO FREQUENCY

LO LEAKAGE AT IF PORT

vs. LO FREQUENCY

-10

-15

-20

-25

-30

-35

-40

-10

-15

-20

-25

-30

-35

-40

-10

-15

-20

-25

-30

-35

-40

V

= 5.25V

CC

T

= -40°C, -25°C

P

= -3dBm

C

LO

V

= 5.0V

CC

T

= +85°C

C

T

= +25°C

C

P

= +3dBm

LO

V

= 4.75V

P

= 0dBm

CC

LO

900

950

1000 1050 1100 1150 1200

LO FREQUENCY (MHz)

900

950

1000 1050 1100 1150 1200

LO FREQUENCY (MHz)

900

950

1000 1050 1100 1150 1200

LO FREQUENCY (MHz)

LO LEAKAGE AT RF PORT

vs. LO FREQUENCY

LO LEAKAGE AT RF PORT

vs. LO FREQUENCY

LO LEAKAGE AT RF PORT

vs. LO FREQUENCY

-30

-40

-50

-60

-30

-40

-50

-60

-30

-40

-50

-60

P

= -3dBm, 0dBm, +3dBm

LO

V

= 4.75V, 5.0V, 5.25V

CC

T

= -40°C, -25°C

C

T

= +25°C

C

T

= +85°C

C

900

950

1000 1050 1100 1150 1200

LO FREQUENCY (MHz)

900

950 1000 1050 1100 1150 1200

LO FREQUENCY (MHz)

900

950 1000 1050 1100 1150 1200

LO FREQUENCY (MHz)

6

_______________________________________________________________________________________

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

Typical Operating Characteristics (continued)

(MAX9986 Typical Application Circuit, V

= +5.0V, P = 0dBm, P = -5dBm, f > f , f = 160MHz, unless otherwise noted.)

LO RF LO RF IF

CC

RF-TO-IF ISOLATION

vs. RF FREQUENCY

RF-TO-IF ISOLATION

vs. RF FREQUENCY

RF-TO-IF ISOLATION

vs. RF FREQUENCY

60

55

50

45

40

35

30

60

55

50

45

40

35

30

V

= 4.75V, 5.0V, 5.25V

P

= 0dBm

CC

LO

55

T

= +85°C

C

T

= +25°C

C

P

= -3dBm

LO

50

45

40

35

30

P

= +3dBm

LO

T

= -40°C, -25°C

C

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

740

790

840

890

940

990 1040

RF FREQUENCY (MHz)

RF PORT RETURN LOSS

vs. RF FREQUENCY

IF PORT RETURN LOSS

vs. IF FREQUENCY

LO SELECTED RETURN LOSS

vs. LO FREQUENCY

0

5

0

5

0

10

P

= -3dBm, 0dBm, +3dBm

10

15

20

25

30

35

40

LO

10

15

20

25

30

P

= +3dBm

LO

20

30

40

50

P

= -3dBm

LO

P

= 0dBm

LO

V

= 4.75V, 5.0V, 5.25V

CC

35

40

740

800

860

920

980 1040 1100

50

100

150

200

250

300

350

700

800

900 1000 1100 1200 1300

LO FREQUENCY (MHz)

RF FREQUENCY (MHz)

IF FREQUENCY (MHz)

LO UNSELECTED RETURN LOSS

vs. LO FREQUENCY

SUPPLY CURRENT

vs. TEMPERATURE (T )

C

0

240

V

= 5.25V

CC

10

230

220

P

= -3dBm, 0dBm, +3dBm

LO

20

30

40

50

210

200

V

= 5.0V

CC

V

= 4.75V

10

CC

700

800

900 1000 1100 1200 1300

LO FREQUENCY (MHz)

-40

-15

35

60

85

TEMPERATURE (°C)

_______________________________________________________________________________________

7

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

Pin Description

NAME

FUNCTION

Power-Supply Connection. Bypass each V

Application Circuit.

pin to GND with capacitors as shown in the Typical

CC

1, 6, 8, 14

V

CC

Single-Ended 50Ω RF Input. This port is internally matched and DC shorted to GND through a balun.

Requires an external DC-blocking capacitor.

2

3

RF

Center Tap of the Internal RF Balun. Bypass to GND with capacitors close to the IC, as shown in the

Typical Application Circuit.

TAP

GND

4, 5, 10, 12,

13, 17

Ground

7

9

LOBIAS

LOSEL

LO1

Bias Resistor for Internal LO Buffer. Connect a 619Ω 1% resistor from LOBIAS to the power supply.

Local Oscillator Select. Logic control input for selecting LO1 or LO2.

Local Oscillator Input 1. Drive LOSEL low to select LO1.

11

15

LO2

Local Oscillator Input 2. Drive LOSEL high to select LO2.

External Inductor Connection. Connect a low-ESR, 30nH inductor from LEXT to GND. This inductor

carries approximately 140mA DC current.

16

LEXT

Differential IF Outputs. Each output requires external bias to V

Typical Application Circuit).

through an RF choke (see the

CC

18, 19

IF-, IF+

20

EP

IFBIAS

GND

IF Bias Resistor Connection for IF Amplifier. Connect a 953Ω 1% resistor from IFBIAS to GND.

Exposed Ground Paddle. Solder the exposed paddle to the ground plane using multiple vias.

RF Input and Balun

Detailed Description

The MAX9986 RF input is internally matched to 50Ω,

requiring no external matching components. A DC-

blocking capacitor is required because the input is inter-

nally DC shorted to ground through the on-chip balun.

The MAX9986 high-linearity downconversion mixer

provides 10dB of conversion gain and +23.6dBm of

IIP3, with a typical 9.3dB noise figure. The integrated

baluns and matching circuitry allow for 50Ω single-

ended interfaces to the RF and the two LO ports. A sin-

gle-pole, double-throw (SPDT) switch provides 50ns

switching time between the two LO inputs with 49dB of

LO-to-LO isolation. Furthermore, the integrated LO

buffer provides a high drive level to the mixer core,

reducing the LO drive required at the MAX9986’s

inputs to a -3dBm to +3dBm range. The IF port incor-

porates a differential output, which is ideal for provid-

ing enhanced IIP2 performance.

LO Inputs, Buffer, and Balun

The MAX9986 is ideally suited for high-side LO injec-

tion applications with a 960MHz to 1180MHz LO fre-

quency range. For a device with a 570MHz to 850MHz

LO frequency range, refer to the MAX9984 data sheet.

As an added feature, the MAX9986 includes an internal

LO SPDT switch that can be used for frequency-hop-

ping applications. The switch selects one of the two

single-ended LO ports, allowing the external oscillator

to settle on a particular frequency before it is switched

in. LO switching time is typically less than 50ns, which

is more than adequate for virtually all GSM applica-

tions. If frequency hopping is not employed, set the

switch to either of the LO inputs. The switch is con-

trolled by a digital input (LOSEL): logic-high selects

LO2, logic-low selects LO1. To avoid damage to the

Specifications are guaranteed over broad frequency

ranges to allow for use in cellular band GSM,

cdma2000, iDEN, and W-CDMA 2G/2.5G/3G base sta-

tions. The MAX9986 is specified to operate over a

815MHz to 995MHz RF frequency range, a 960MHz to

1180MHz LO frequency range, and a 50MHz to

250MHz IF frequency range. Operation beyond these

ranges is possible; see the Typical Operating

Characteristics for additional details.

part, voltage must be applied to V

before digital

CC

logic is applied to LOSEL. LO1 and LO2 inputs are

internally matched to 50Ω, requiring only a 82pF DC-

blocking capacitor.

8

_______________________________________________________________________________________

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

A two-stage internal LO buffer allows a wide input

power range for the LO drive. All guaranteed specifica-

tions are for an LO signal power from -3dBm to +3dBm.

The on-chip low-loss balun, along with an LO buffer,

drives the double-balanced mixer. All interfacing and

matching components from the LO inputs to the IF out-

puts are integrated on-chip.

optimize the performance for a particular frequency

band. Since approximately 140mA flows through this

inductor, it is important to use a low-DCR wire-wound coil.

If the LO-to-IF and RF-to-IF leakage are not critical

parameters, the inductor can be replaced by a short

circuit to ground.

Layout Considerations

A properly designed PC board is an essential part of

any RF/microwave circuit. Keep RF signal lines as short

as possible to reduce losses, radiation, and induc-

tance. For the best performance, route the ground pin

traces directly to the exposed pad under the package.

The PC board exposed pad MUST be connected to the

ground plane of the PC board. It is suggested that mul-

tiple vias be used to connect this pad to the lower level

ground planes. This method provides a good RF/ther-

mal conduction path for the device. Solder the exposed

pad on the bottom of the device package to the PC

board. The MAX9986 Evaluation Kit can be used as a

reference for board layout. Gerber files are available

upon request at www.maxim-ic.com.

High-Linearity Mixer

The core of the MAX9986 is a double-balanced, high-

performance passive mixer. Exceptional linearity is pro-

vided by the large LO swing from the on-chip LO

buffer. When combined with the integrated IF ampli-

fiers, the cascaded IIP3, 2LO-2RF rejection, and NF

performance is typically 23.6dBm, 67dBc, and 9.3dB,

respectively.

Differential IF Output Amplifier

The MAX9986 mixer has a 50MHz to 250MHz IF fre-

quency range. The differential, open-collector IF output

ports require external pullup inductors to V . Note that

CC

these differential outputs are ideal for providing

enhanced 2LO-2RF rejection performance. Single-

ended IF applications require a 4:1 balun to transform

the 200Ω differential output impedance to a 50Ω single-

ended output.

Power-Supply Bypassing

Proper voltage-supply bypassing is essential for high-

frequency circuit stability. Bypass each V

pin and

CC

TAP with the capacitors shown in the Typical Application

Circuit; see Table 1. Place the TAP bypass capacitor to

ground within 100 mils of the TAP pin.

Applications Information

Input and Output Matching

The RF and LO inputs are internally matched to 50Ω. No

matching components are required. RF and LO inputs

require only DC-blocking capacitors for interfacing.

Exposed Pad RF/Thermal Considerations

The exposed paddle (EP) of the MAX9986’s 20-pin thin

QFN-EP package provides a low thermal-resistance

path to the die. It is important that the PC board on

which the MAX9986 is mounted be designed to con-

duct heat from the EP. In addition, provide the EP with

a low-inductance path to electrical ground. The EP

MUST be soldered to a ground plane on the PC board,

either directly or through an array of plated via holes.

The IF output impedance is 200Ω (differential). For

evaluation, an external low-loss 4:1 (impedance ratio)

balun transforms this impedance down to a 50Ω single-

ended output (see the Typical Application Circuit).

Bias Resistors

Bias currents for the LO buffer and the IF amplifier are

optimized by fine tuning resistors R1 and R2. If

reduced current is required at the expense of perfor-

mance, contact the factory for details. If the 1% bias

resistor values are not readily available, substitute stan-

dard 5% values.

Chip Information

TRANSISTOR COUNT: 1017

PROCESS: SiGe BiCMOS

LEXT Inductor

LEXT serves to improve the LO-to-IF and RF-to-IF leak-

age. The inductance value can be adjusted by the user to

_______________________________________________________________________________________

9

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

Table 1. Component List Referring to the Typical Application Circuit

COMPONENT

VALUE

330nH

30nH

DESCRIPTION

Wire-wound high-Q inductors (0805)

L1, L2

L3

Wire-wound high-Q inductor (0603)

Microwave capacitor (0603)

Microwave capacitors (0603)

Microwave capacitor (0402)

1% resistor (0603)

C1

10pF

C2, C4, C7, C8, C10, C11, C12

82pF

C3, C5, C6, C9, C13, C14

0.01µF

220pF

953Ω

C15

R1

R2

R3

T1

619Ω

1% resistor (0603)

3.57Ω

4:1 balun

MAX9986

1% resistor (1206)

IF balun

U1

Maxim IC

Pin Configuration/Functional Diagram

20

18

19

16

17

V

CC

1

2

3

4

15

14

13

12

11

LO2

V

CC

RF

MAX9986

TAP

GND

LO1

GND

5

6

7

8

9

10

THIN QFN

10 ______________________________________________________________________________________

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

Typical Application Circuit

V

CC

T1

3

6

4

IF

R3

OUTPUT

L1

L2

2

C13

1

C15

17

C14

R1

L3

V

CC

19

18

16

20

C12

C3

C2

V

CC

LO2

INPUT

1

2

3

4

5

15

C1

MAX9986

V

CC

RF

INPUT

RF

TAP

14

13

12

11

V

CC

C11

C5

GND

C4

GND

C10

LO1

INPUT

LO1

6

7

8

9

10

R2

C7

V

CC

LOSEL

INPUT

C6

C8

C9

V

CC

______________________________________________________________________________________ 11

SiGe High-Linearity, 815MHz to 995MHz

Downconversion Mixer with LO Buffer/Switch

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.)

D2

D

b

0.10 M

C A B

C

L

D2/2

D/2

k

L

MARKING

XXXXX

E/2

E2/2

C

(NE-1) X

e

L

E2

E

PIN # 1 I.D.

0.35x45°

DETAIL A

e/2

PIN # 1

I.D.

e

(ND-1) X

e

DETAIL B

e

L

C

L

L1

L

e

0.10

C

A

0.08

C

A3

A1

PACKAGE OUTLINE,

16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm

1

21-0140

H

-DRAWING NOT TO SCALE-

2

COMMON DIMENSIONS

20L 5x5 28L 5x5

EXPOSED PAD VARIATIONS

D2 E2

MIN. NOM. MAX. MIN. NOM. MAX. ±0.15

PKG.

SYMBOL MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX.

16L 5x5

32L 5x5

40L 5x5

DOWN

BONDS

ALLOWED

L

PKG.

CODES

A

0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80

T1655-1

T1655-2

3.00 3.10 3.20 3.00 3.10 3.20

NO

**

A1

A3

b

0

0.02 0.05

0.20 REF.

0

0.02 0.05

0.20 REF.

0

0.02 0.05

0.20 REF.

0

0.02 0.05

0.20 REF.

0

0.02 0.05

0.20 REF.

YES

NO

T1655N-1 3.00 3.10 3.20 3.00 3.10 3.20

0.25 0.30 0.35 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 0.15 0.20 0.25

4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10

T2055-2

T2055-3

T2055-4

T2055-5

3.00 3.10 3.20 3.00 3.10 3.20

NO

YES

NO

D

E

**

e

0.80 BSC.

0.25

0.65 BSC.

0.25

0.50 BSC.

0.25

0.50 BSC.

0.25

0.40 BSC.

YES

3.15 3.25 3.35 3.15 3.25 3.35 0.40

k

-

0.25 0.35 0.45

T2855-1

T2855-2

3.15 3.25 3.35 3.15 3.25 3.35

2.60 2.70 2.80 2.60 2.70 2.80

NO

L

**

0.30 0.40 0.50 0.45 0.55 0.65 0.45 0.55 0.65 0.30 0.40 0.50 0.40 0.50 0.60

L1

-

0.30 0.40 0.50

40

T2855-3

T2855-4

3.15 3.25 3.35 3.15 3.25 3.35

2.60 2.70 2.80 2.60 2.70 2.80

3.15 3.25 3.35 3.15 3.25 3.35

YES

NO

N

ND

NE

16

20

28

32

4

5

7

8

10

T2855-5

T2855-6

T2855-7

T2855-8

**

WHHB

WHHC

WHHD-1

WHHD-2

-----

JEDEC

NO

YES

2.80

3.35

3.20

2.60 2.70

3.15 3.25

2.60 2.70 2.80

3.15 3.25 3.35

3.00 3.10 3.20

0.40

YES

NO

NOTES:

T2855N-1 3.15 3.25

**

1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.

2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.

3. N IS THE TOTAL NUMBER OF TERMINALS.

T3255-2

T3255-3

T3255-4

3.00 3.10

3.00 3.10 3.20 3.00 3.10 3.20

YES

NO

**

4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL

CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE

OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1

IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.

NO

T3255N-1 3.00 3.10 3.20 3.00 3.10 3.20

T4055-1 3.20 3.30 3.40 3.20 3.30 3.40

YES

**^{SEE COMMON DIMENSIONS TABLE}

5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN

0.25 mm AND 0.30 mm FROM TERMINAL TIP.

6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.

7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.

8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.

9. DRAWING CONFORMS TO JEDEC MO220, EXCEPT EXPOSED PAD DIMENSION FOR T2855-1,

T2855-3, AND T2855-6.

10. WARPAGE SHALL NOT EXCEED 0.10 mm.

11. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.

12. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.

13. LEAD CENTERLINES TO BE AT TRUE POSITION AS DEFINED BY BASIC DIMENSION "e", ±0.05.

PACKAGE OUTLINE,

16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm

2

-DRAWING NOT TO SCALE-

21-0140

H

2

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.

12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Printed USA

is a registered trademark of Maxim Integrated Products, Inc.


型号：	MAX9986ETP-T
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	SiGe High-Linearity, 815MHz to 995MHz Downconversion Mixer with LO Buffer/Switch SiGe，高线性度，815MHz至995MHz下变频混频器，带有LO缓冲器/开关射频和微波射频上变频器射频下变频器微波上变频器微波下变频器开关信息通信管理
文件：	总12页 (文件大小：1032K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MAX9986ETP-T [MAXIM]

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