Maxim MAX2463EAI, MAX2460EAI, MAX2422EAI, MAX2421EAI, MAX2420EAI Datasheet

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General Description

The MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
are highly integrated front-end ICs that provide the lowest
cost solution for cordless phones and ISM-band radios
operating in the 900MHz band. All devices incorporate
transmit and receive image-reject mixers to reduce filter
cost. They operate with a +2.7V to +4.8V power supply,
allowing direct connection to a 3-cell battery stack.

The receive path incorporates an adjustable-gain LNA
and an image-reject downconverter with 35dB image
suppression. These features yield excellent combined
downconverter noise figure (4dB) and high linearity with
an input third-order intercept point (IP3) of up to +2dBm.

The transmitter consists of a variable-gain IF amplifier
with more than 35dB control range, an image-reject
upconverter with 35dB image rejection, and a power­amplifier (PA) predriver that produces up to +2dBm (in
some applications serving as the final power stage).

All devices include an on-chip local oscillator (LO),
requiring only an external varactor-tuned LC tank for
operation. The integrated divide-by-64/65 dual-modulus
prescaler can also be set to a direct mode, in which it
acts as an LO buffer amplifier. Four separate power­down inputs can be used for system power manage­ment, including a 0.5µA shutdown mode. These parts
are compatible with commonly used modulation
schemes such as FSK, BPSK, and QPSK, as well as fre­quency hopping and direct sequence spread-spectrum
systems. All devices come in a 28-pin SSOP package.

For applications using direct VCO or BPSK transmit mod­ulation as well as receive image rejection, consult the
MAX2424/MAX2426 data sheet. For receive-only devices,
refer to the MAX2440/MAX2441/MAX2442 data sheet.

________________________Applications

Cordless Phones Spread-Spectrum Communications
Wireless Telemetry Two-Way Paging
Wireless Networks

Features

♦ Receive/Transmit Mixers with 35dB Image Rejection
♦ Adjustable-Gain LNA
♦ Up to +2dBm Combined Receiver Input IP3
♦ 4dB Combined Receiver Noise Figure
♦ >35dB of Transmit Power Control Range
♦ PA Predriver Provides up to +2dBm
♦ Low Current Consumption: 23mA Receive

26mA Transmit

9.5mA Oscillator

♦ 0.5µA Shutdown Mode
♦ Operates from Single +2.7V to +4.8V Supply

MAX2420/MAX2421/MAX2422/MAX2460/MAX2463

900MHz Image-Reject Transceivers

________________________________________________________________

Maxim Integrated Products

1

28
27
26
25
24
23
22
21
20
19
18
17
16
15

1
2
3
4
5
6
7
8

9
10
11
12
13
14

GND
GND
GND

TANK

TXON

PREOUT
PREGND

MOD
DIV1

VCOON

RXON

CAP2

N.C.

TXIN

LNAGAIN

TXOUT

GND

GND

RXIN

TXGAIN

RXOUT

CAP1

SSOP

TOP VIEW

MAX2420
MAX2421
MAX2422
MAX2460
MAX2463

TANK

V

CC

V

CC

V

CC

V

CC

V

CC

___________________Pin Configuration

19-1234; Rev 2; 2/99

PART

MAX2420EAI
MAX2421EAI
MAX2422EAI

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

28 SSOP
28 SSOP
28 SSOP

_______________Ordering Information

MAX2460EAI

-40°C to +85°C 28 SSOP

Functional Diagram appears on last page.

MAX2463EAI

-40°C to +85°C 28 SSOP

High side

INJECTION

TYPE

fRF+ 10.7

LO FREQ

(MHz)

High side

High side

fRF+ 70

fRF+ 46

MAX2422

MAX2421

70

46

Low side fRF- 110MAX2463 110

MAX2420

PART

10.7

IF FREQ

(MHz)

______________________Selector Guide

Low side fRF- 10.7MAX2460 10.7

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

µA

MAX2420/MAX2421/MAX2422/MAX2460/MAX2463

900MHz Image-Reject Transceivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +4.8V, no RF signals applied, LNAGAIN = TXGAIN = open, VCOON = 2.4V, RXON = TXON = MOD = DIV1 = 0.45V,
PREGND = GND, T

A

= T

MIN

to T

MAX

. Typical values are at TA= +25°C, VCC= +3.3V, unless otherwise noted.)

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.

Note 1: Calculated by measuring the combined oscillator and prescaler supply current and subtracting the oscillator supply current.
Note 2: Calculated by measuring the combined oscillator and LO buffer supply current and subtracting the oscillator supply current.
Note 3: Calculated by measuring the combined receive and oscillator supply current and subtracting the oscillator supply current.

With LNAGAIN = GND, the supply current drops by 4.5mA.

Note 4: Calculated by measuring the combined transmit and oscillator supply current and subtracting the oscillator supply current.

V

CC

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

TXIN Input Power (330Ω system)......................................-8dBm

Voltage on TXOUT......................................-0.3V to (V

CC

+ 1.0V)

Voltage on TXGAIN, LNAGAIN, TXON,

RXON, VCOON, DIV1, MOD ....................-0.3V to (V

CC

+ 0.3V)

RXIN Input Power..............................................................10dBm

TANK,

TANK Input Power...................................................2dBm

Continuous Power Dissipation (T

A

= +70°C)

SSOP (derate 9.50mW/°C above +70°C) ......................762mW

Operating Temperature Range

MAX242_EAI/MAX246_EAI................................-40°C to +85°C

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

Storage Temperature Range.............................-65°C to +165°C

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

PARAMETER

MIN TYP MAX UNITS

Receive Supply Current (Note 3) 23 36 mA

Prescaler Supply Current
(buffer mode) (Note 2)

5.4 8.5 mA

Oscillator Supply Current

Supply-Voltage Range 2.7 4.8 V

9.5 14 mA

Prescaler Supply Current
(divide-by-64/65 mode) (Note 1)

4.2 6 mA

CONDITIONS

RXON = 2.4V, PREGND = floating

DIV1 = 2.4V

PREGND = floating

Digital Input Voltage Low 0.45 V

Transmitter Supply Current (Note 4) 26 42 mA

0.5

RXON, TXON, DIV1, VCOON, MOD

RXON = 0.45V, TXON = 2.4V, PREGND = floating
VCOON = RXON = TXON =

MOD = DIV1 = GND

Digital Input Current ±1 ±10 µAVoltage on any one digital input = VCCor GND

Digital Input Voltage High V2.4RXON, TXON, DIV1, VCOON, MOD

Shutdown Supply Current

10

µA

TA= +25°C
TA= T

MIN

to T

MAX

LNAGAIN = 1V

AC ELECTRICAL CHARACTERISTICS

(MAX242X/246X EV kit, VCC= +3.3V; fLO= 925.7MHz (MAX2420), fLO= 961MHz (MAX2421), fLO= 985MHz (MAX2422),
f

LO

= 904.3MHz (MAX2460); fLO= 805MHz (MAX2463); f

RXIN

= 915MHz; P

RXIN

= -35dBm; P

TXIN

= -15dBm (330Ω); LNAGAIN = 2V;

TXGAIN = V

CC

; VCOON = 2.4V; RXON = TXON = MOD = DIV1 = PREGND = GND; TA= +25°C; unless otherwise noted.)

MAX2420/MAX2421/MAX2422/MAX2460/MAX2463

900MHz Image-Reject Transceivers

_______________________________________________________________________________________ 3

CONDITIONS UNITSMIN TYP MAXPARAMETER

MHz800 1000

Input Frequency Range
(Notes 5, 6)

MAX2421 36 46 55

MAX2420/MAX2460 8.5 10.7 12.5

MAX2463

MHz

86 110 132

IF Frequency Range
(Notes 5, 6)

20 22 24.5

MAX2422

dB26 35Image Frequency Rejection

55 70 85

LNAGAIN = VCC,
TA= +25°C

18 20 22.5

18 24

19.5 25

LNAGAIN = 1V 12

DIV1 = V

CC

45

LNAGAIN = VCC,
TA= T

MIN

to T

MAX

(Note 5)

LNAGAIN = GND

dB

-16

Conversion Power Gain (Note 7)

17 23

19 21 23.5

dB

12

Noise Figure (Notes 5, 7)

LNAGAIN = 1V

dBm

-8

Input Third-Order Intercept
(Notes 5, 8)

LNAGAIN = V

CC

-19 -17

(Note 9) ns500Receiver Turn-On Time

MHz800 1000

Output Frequency Range
(Notes 5, 6)

Receiver on or off dBm-60LO to RXIN Leakage

MAX2421 36 46 55

MAX2463

MHz

86 110 132

IF Frequency Range

MAX2420/MAX2460

MAX2422 55 70 85

dB

11 13.5 16

9 12 14.5

10 12.5 15

dB26 35Image Frequency Rejection

8.5 10.7 12.5

TA= +25°C

8 11 13.5

10 15.5

TA= T

MIN

to T

MAX

(Note 5)

814

Conversion Gain

915

10.5 16.5

LNAGAIN = 1V

dBm

-18

Input 1dB Compression

LNAGAIN = V

CC

-26

MAX2420/MAX2421/MAX2460
MAX2422
MAX2463
MAX2420/MAX2421/MAX2460
MAX2422
MAX2463

MAX2420/2460
MAX2421
MAX2422
MAX2463
MAX2420/2460
MAX2421
MAX2422
MAX2463

LNAGAIN = V

CC

LNAGAIN = 1V

RECEIVER (RXON = 2.4V)

TRANSMITTER (TXON = 2.4V)

MAX2420/MAX2421/MAX2422/MAX2460/MAX2463

900MHz Image-Reject Transceivers

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX242X/246X EV kit, VCC= +3.3V; fLO= 925.7MHz (MAX2420), fLO= 961MHz (MAX2421), fLO= 985MHz (MAX2422),
f

LO

= 904.3MHz (MAX2460); fLO= 805MHz (MAX2463); f

RXIN

= 915MHz; P

RXIN

= -35dBm; P

TXIN

= -15dBm (330Ω); LNAGAIN = 2V;

TXGAIN = V

CC

; VCOON = 2.4V; RXON = TXON = MOD = DIV1 = PREGND = GND; TA= +25°C; unless otherwise noted.)

PARAMETER MIN TYP MAX UNITS

Transmitter Turn-On Time (Note 13)

Gain Control Range (Note 12) 36

TXGAIN Control Slope (Note 12)

dB

33 dB/V

400 ns

Oscillator Phase Noise

Output 1dB Compression

Oscillator Frequency Range
(Notes 5, 14)

2 dBm

690 1100 MHz

82 dBc/Hz

8

10kHz offset (Note 15)
Standby to TX, or standby to RX

CONDITIONS

1V ≤ TXGAIN ≤ 2V

Note 5: Guaranteed by design and characterization.
Note 6: Image rejection typically falls to 30dBc at the frequency extremes.
Note 7: Refer to the

Typical Operating Characteristics

for plots showing receiver gain versus LNAGAIN voltage, input IP3 versus

LNAGAIN voltage, and noise figure versus LNAGAIN voltage.

Note 8: Two tones at P

RXIN

= -45dBm each, f1 = 915.0MHz and f2 = 915.2MHz.

Note 9: Time delay from RXON = 0.45V to RXON = 2.4V transition to the time the output envelope reaches 90% of its final value.
Note 10: Two tones at P

TXIN

= -21dBm each (330Ω), f1 = 10.6MHz, f2 = 10.8MHz (MAX2420/MAX2460), f1 = 45.9MHz,

f2 = 46.1MHz (MAX2421), f1 = 69.9MHz, f2 = 70.1MHz (MAX2422).

Note 11: Refer to the

Typical Operating Characteristics

for statistical data.

Note 12: Refer to the

Typical Operating Characteristics

for a plot showing transmitter gain versus TXGAIN voltage.

Note 13: Time delay from TXON = 0.45V to TXON = 2.4V transition to the time the output envelope reaches 90% of its final value.
Note 14: Refers to useable operating range. Tuning range of any given tank circuit design is typically much narrower (refer to Figure 2).
Note 15: Using tank components L3 = 5.0nH (Coilcraft A02T), C2 = C3 = C26 = 3.3pF, R6 = R7 = 10Ω.
Note 16: This approximates a typical application in which TXOUT is followed by an external PA and a T/R switch with finite isolation.
Note 17: Relative to the rising edge of PREOUT.

Prescaler Output Level

500 mVp-p

-11 -8

Required Modulus Setup Time
(Note 5)

10 ns

ZL= 100kΩ

| |

10pF

DIV1 = 2.4V, ZL= 50Ω, TA= +25°C

Divide-by-64/65 mode (Note 17)

Required Modulus Hold Time
(Note 5)

0 ns

Divide-by-64/65 mode (Note 17)

RX to TX with P

RXIN

= -45dBm (RX mode) to

P

RXIN

= 0dBm (TX mode) (Note 16)

70

Oscillator Buffer Output Level
(Note 5)

-12

dBm

DIV1 = 2.4V, ZL= 50Ω, TA= T

MIN

to T

MAX

Oscillator Pulling kHz

Output Third-Order Intercept
(Note 10)

11 dBm

Noise Figure 23

LO to TXOUT Suppression
(Note 11)

34 dBc

dB

OSCILLATOR AND PRESCALER

MAX2420/MAX2421/MAX2422/MAX2460/MAX2463

900MHz Image-Reject Transceivers

_______________________________________________________________________________________

5

24

28
26

34
32
30

40
38
36

42

-40 0 20-20 40 60 80 100

RECEIVER SUPPLY CURRENT

vs. TEMPERATURE

MAX2420-01

TEMPERATURE (°C)

I

CC

(mA)

VCC = 2.7V

RXON = V

CC

PREGND = FLOATING
INCLUDES OSCILLATOR
CURRENT

VCC = 3.3V

VCC = 4.8V

26

30
28

36
34
32

44
42
40
38

46

-40 0 20-20 40 60 80 100

TRANSMITTER SUPPLY CURRENT

vs. TEMPERATURE

MAX2420-02

TEMPERATURE (°C)

I

CC

(mA)

VCC = 2.7V

VCC = 3.3V

VCC = 4.8V

TXON = V

CC

PREGND = FLOATING
INCLUDES OSCILLATOR
CURRENT

0

1.0

0.5

2.5

2.0

1.5

4.0

3.5

3.0

4.5

-40 0 20-20 40 60 80 100

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX2420-03

TEMPERATURE (°C)

I

CC

(µA)

VCC = 2.7V

VCC = 3.3V

VCC = 4.8V

VCOON = GND

25
20
15
10

5
0

-5

-10

-15

-20
0 0.5 1.0 1.5 2.0

RECEIVER GAIN vs. LNAGAIN

MAX2420-04

LNAGAIN VOLTAGE (V)

RECEIVER GAIN (dB)

ADJUSTABLE

GAIN

MAX
GAIN

LNA

PARTIALLY

BIASED

LNA
OFF

AVOID

THIS

REGION

RXON = V

CC

18

22

20

26

24

-40 0 20-20 40 60 80 100

MAX2420

RECEIVER GAIN vs. TEMPERATURE

MAX2420-07

TEMPERATURE (°C)

RECEIVER GAIN (dB)

VCC = 2.7V

VCC = 3.3V

VCC = 4.8V

LNAGAIN = V

CC

RXON = V

CC

-20

-15

-10

-5

0

5

0 0.5 1.0 1.5 2.0

RECEIVER INPUT IP3 vs. V

LNAGAIN

MAX2420-05

LNAGAIN VOLTAGE (V)

IIP3 (dBm)

ADJUSTABLE

GAIN

AVOID

THIS

REGION

MAX
GAIN

LNA

PARTIALLY

BIASED

LNA
OFF

RXON = V

CC

0

5

15
10

25
20

30

40
35

0 0.5 1.0 1.5 2.0

RECEIVER NOISE FIGURE

vs. LNAGAIN

MAX2420-06

LNAGAIN VOLTAGE (V)

NOISE FIGURE (dB)

ADJUSTABLE

GAIN

AVOID

THIS

REGION

MAX
GAIN

LNA

PARTIALLY

BIASED

LNA
OFF

DIV1 = V

CC

RXON = V

CC

3.0

4.0

3.5

5.0

5.5

4.5

-40 0 20-20 40 60 80 100

RECEIVER NOISE FIGURE vs.

TEMPERATURE AND SUPPLY VOLTAGE

MAX2420-08

TEMPERATURE (°C)

NOISE FIGURE (dB)

VCC = 2.7V

VCC = 3.3V

VCC = 4.8V

LNAGAIN = V

CC

RXON = V

CC

DIV1 = V

CC

-20

-16

-18

-8

-10

-6

-12

-14

-40 0 20-20 40 60 80 100

RECEIVER INPUT IP3

vs. TEMPERATURE

MAX2420-09

TEMPERATURE (°C)

IIP3 (dBm)

LNAGAIN = 1V

LNAGAIN = 2V

RXON = V

CC

Typical Operating Characteristics

(MAX242X/246X EV kit, VCC= +3.3V; fLO= 925.7MHz (MAX2420), fLO= 961MHz (MAX2421), fLO= 985MHz (MAX2422), fLO= 904.3MHz
(MAX2460); fLO= 805MHz (MAX2463); f

RXIN

= 915MHz; P

RXIN

= -35dBm; P

TXIN

= -15dBm (330Ω); LNAGAIN = 2V; TXGAIN = VCC;

VCOON = 2.4V; RXON = TXON = MOD = DIV1 = PREGND = GND; TA= +25°C; unless otherwise noted.)