Maxim MAX3510EEP Datasheet

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General Description

The MAX3510 is a programmable power amplifier for
use in CATV upstream applications. The device outputs
up to 64dBmV (continuous wave) through a 2:1 (voltage
ratio) transformer. It features variable gain controlled by
a 3-wire digital serial bus. Gain control is available in
1dB steps. The device operates over a frequency
range of 5MHz to 65MHz.

The MAX3510 offers a transmit-disable mode, which
places the device in a high-isolation state for use
between bursts in TDMA systems. In this mode the out­put stage is shut off, minimizing output noise. When
entering and leaving transmit-disable mode, transients
are kept to 7mV nominal at full gain. In addition, supply
current is reduced to 25mA.

Two power-down modes are available. Software-shutdown
mode permits power-down of all analog circuitry while
maintaining the programmed gain setting. Shutdown
mode disables all circuitry and reduces current consump­tion to less than 10µA.

The MAX3510 is available in a 20-pin QSOP package
for the extended-industrial temperature range (-40°C to
+85°C).

Applications

Cable Modems Telephony over Cable
CATV Set-Top Box CATV Status Monitor

Features

♦ Ultra-Low Power-Up/Down Transients,

7mV Typical at 59dBmV Output

♦ Single +5V Supply
♦ Output Level Ranges from <8dBmV to 64dBmV
♦ Gain Programmable in 1dB Steps
♦ Low Transmit Output Noise Floor: -47dBmV

(160kHz BW)

♦ Low Transmit-Disable Output Noise: -70dBmV
♦ Two Power-Down Modes

MAX3510

Upstream CATV Amplifier

________________________________________________________________

Maxim Integrated Products

1

Typical Operating Circuit

19-1398; Rev 2; 8/99

PART

MAX3510EEP -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

20 QSOP

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Pin Configuration appears at end of data sheet.

Ordering Information

12

SHDN

18

TXEN

5

VIN+

+

INPUT

CONTROL

LOGIC

0.001µF

ANTI-ALIAS

FILTER

MAX3510

0.001µF

6

VIN-

2

1

V

CC

4

GND1

3

GND

7

GND

1

GND

–

+5V

0.1µF

GND2

V

CC

CEXT1

VOUT+

VOUT-

CEXT2

N.C.

GND

SCLK

SDA

20

19

2

17

16

15

14

13
11

10

9

8

CS

0.0033µF

+5V

0.1µF

0.1µF

CONTROL
LOGIC

+5V

2:1

0.1µF

OUTPUT

MAX3510

Upstream CATV Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +4.75V to +5.25V, TXEN = SHDN = high, D7 = 1, TA = -40°C to +85°C, unless otherwise noted. No input signal applied.
Typical parameters are at T

A

= +25°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.

VCC(VCC1, VCC2), VOUT+, VOUT- ................... -0.5V to +10.0V

Input Voltage Levels (all inputs),

CEXT1, CEXT2.........................................-0.3V to (V

CC

+ 0.3V)

Continuous Input Voltage (VIN+, VIN-)...............................2Vp-p

Continuous Current (VOUT+, VOUT-).................................80mA

Continuous Power Dissipation (T

A

= +70°C)

20-Pin QSOP (derate at 12.3mW/°C above +70°C)....1067mW

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

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

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

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

TXEN = low

TXEN = low, D7 = 0

SHDN = low, TXEN = low

CONDITIONS

mA26 30I

CC

Supply Current Transmit-Disable
Mode

mA109 126I

CC

V4.75 5.25V

CC

Supply Voltage
Supply Current Transmit Mode

µA-100I

BIASL

Input Low Current

µA100I

BIASH

Input High Current

mA1.4 2.0I

CC

Supply Current Software­Shutdown Mode

µA110I

CC

Supply Current Shutdown Mode

V2.0V

INH

Input High Voltage

V0.8V

INL

Input Low Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

AC ELECTRICAL CHARACTERISTICS

(VCC= +4.75V to +5.25V, TXEN = SHDN = high, D7 = 1, VIN= 34dBmV differential, output impedance = 75Ω through a 2:1 trans­former, T

A

= -40°C to +85°C, unless otherwise noted. Typical parameters are at TA= +25°C.)

V

OUT

= 60dBmV, fIN= 42MHz (Notes 1, 2)

V

OUT

= 60dBmV, fIN= 65MHz (Notes 1, 2)

dB

-0.9 -1

-1.6 -1.8

AV= 26dB, 42MHz (Note 1)

V

OUT

= 60dBmV, -3dB (Note 1)

CONDITIONS

Gain Rolloff

dBm18.0 20.0P1dB1dB Compression Point

MHz84 100f

3dB

Bandwidth

UNITSMIN TYP MAXSYMBOLPARAMETER

-26

Gain control word = 1,
TA= -40°C to +85°C

26

Gain control word = 63,
TA= 0°C to +85°C

27

Gain control word = 63,
TA= -40°C to 0°C

Gain control word = 50,
TA= -40°C to +85°C

fIN= 5MHz
to 42MHz

16.7 20.4

dBA

V

Voltage Gain

dB

0.7 1 1.3

Output Step Size

AV= -26dB to +27dB,
T

A

= -40°C to +85°C

f

IN

= 5MHz to 42MHz

AV= -26dB to +26dB,
TA= -40°C to 0°C

0.65 1 1.3

fIN= 10MHz

dBc

MAX3510

Upstream CATV Amplifier

_______________________________________________________________________________________ 3

BW = 160kHz, AV= -26dB (Note 1)

BW = 160kHz, AV= 26dB (Note 1)

fIN= 5MHz to 65MHz
(Note 1)

fIN= 5MHz to 65MHz, single-ended,
TA= +25°C (Note 1)

CONDITIONS

dBc

47 -46

-78

Transmit Mode Noise

7.7 12.2

8.0 13.5



Z

IN



kΩ1.4 1.5Input Impedance

Ω75Z

OUT

Output Impedance

UNITSMIN TYP MAXSYMBOLPARAMETER

AC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +4.75V to +5.25V, TXEN = SHDN = high, D7 = 1, VIN= 34dBmV differential, output impedance = 75Ω through a 2:1 trans­former, T

A

= -40°C to +85°C, unless otherwise noted. Typical parameters are at TA= +25°C.)

Input tones at 40MHz and 40.2MHz,
VIN= 28dBmV/tone, V

OUT

= +54dBmV/tone,

TA= +25°C (Note 1)

fIN= 33MHz,
TA= -40°C to +85°C

-59 -53

-55 -50
dBc

-54 -50

2nd Harmonic Distortion

fIN= 22MHz,
TA= -40°C to +85°C

-54 -50

-58 -53

dBc

AV= 26dB, VINswept from 34dBmV to
38dBmV (Note 1)

dB0.1AM/AMAM to AM

AV= 26dB, VINswept from 34dBmV to
38dBmV (Note 1)

degrees1AM/PMAM to PM

HD2

fIN= 65MHz, V

OUT

= +59dBmV,

TA= +25°C (Note 1)

HD33rd Harmonic Distortion

fIN= 65MHz, V

OUT

= +59dBmV,

T

A

= +25°C (Note 1)

-49 -44

IM3Two-Tone Third-Order Distortion dBc

dB

8.9 13.9

R

L

Output Return Loss in Transmit
Mode

8.7 13.5

TXEN = low,
fIN= 5MHz to 65MHz
(Note 1)

7.1 12.0

R

L

dB

Output Return Loss in
Transmit-Disable Mode

-56 -53

TA= 0°C
TA= +25°C
TA= +85°C
TA= 0°C
TA= +25°C
TA= +85°C

V

OUT

= +54dBmV

V

OUT

= +59dBmV

V

OUT

= +54dBmV

V

OUT

= +59dBmV

Input tones at 65MHz and 65.2MHz,
VIN= 28dBmV/tone, V

OUT

= 53dBmV/tone,

TA= +25°C (Note 1)

-54 -51

9.7 12.7

Gain = 2dB or lower, TA= +25°C (Note 1)

Gain = 26dB, TA= +25°C (Note 1)

mVp-p

0.7 3.7

737

TXEN Transient Step Size

dBmV

TXEN = low, BW = 160kHz,
AV= +26dB, fIN= 5MHz to 65MHz (Note 1)

dBmV-70

Transmit-Disable Mode Noise
Floor

TXEN low, gain control word = 61,
fIN= 65MHz

dB36 45

Isolation in Transmit-Disable
Mode

TXEN rise/fall time < 0.1µs, TA= +25°C (Note 1) µs3.2 5TXEN Transient Duration

MAX3510

Upstream CATV Amplifier

4 _______________________________________________________________________________________

Note 1: Guaranteed by design and characterization.
Note 2: Reference to 5MHz.

TIMING CHARACTERISTICS

(VCC= +4.75V to +5.25V, TXEN = SHDN = high, D7 = 1, TA = +25°C, unless otherwise noted.)

COMMENT

ns10t

SDAS

SDA to SCK Setup Time

ns20t

SENH

ns10t

SENS

CS to SCK Rise Setup Time
CS to SCK Rise Hold Time

ns50t

SCKL

SCK Pulse Width Low

ns20t

SDAH

SDA to SCK Hold Time

ns50t

DATAH

SDA Pulse Width High

ns50t

DATAL

SDA Pulse Width Low

ns50t

SCKH

SCK Pulse Width High

UNITSMIN TYP MAXSYMBOLPARAMETER

Typical Operating Characteristics

(VCC= +5V, VIN= +34dBmV, TXEN = SHDN = high, fIN= 20MHz, Z

LOAD

= 75Ω through a 2:1 transformer, TA= +25°C, unless

otherwise noted.)

102

104

108

106

110

112

-50 0-25 25 50 75 100

SUPPLY CURRENT vs. TEMPERATURE

MAX3510 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

VCC = 5.25V

VCC = 4.75V

0

0.4

0.8

1.2

1.6

2.0

4.75 4.95 5.04.85 4.94.8 5.05 5.1 5.15 5.2 5.25

VOLTAGE GAIN vs. SUPPLY VOLTAGE

(GAIN STATE = 33)

MAX3510 toc02

SUPPLY VOLTAGE (V)

VOLTAGE GAIN (dB)

-40°C

0°C

+25°C

+85°C

26.6

26.8

4.75 4.95 5.04.85 4.94.8 5.05 5.1 5.15 5.2 5.25

VOLTAGE GAIN vs. SUPPLY VOLTAGE

(GAIN STATE = 60)

MAX3510 toc03

SUPPLY VOLTAGE (V)

VOLTAGE GAIN (dB)

-40°C

+25°C

+85°C

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

-50 0-25 25 50 75 100

VOLTAGE GAIN vs. TEMPERATURE

(GAIN STATE = 33)

MAX3510 toc04

TEMPERATURE (°C)

VOLTAGE GAIN (dB)

5.25V

5.0V

4.75V

40

-60
1 10 100 1000

VOLTAGE GAIN vs. FREQUENCY

-40

MAX3510 toc05

FREQUENCY (MHz)

VOLTAGE GAIN (dB)

-20

0

20

30

-50

-30

-10

10

G

F

E

D

C

B

A

A=63
B=57

C=48
D=36

E=24
F=12

G=6

GAIN CONTROL WORD:

-40

-30

30

-10

-20

0

10

20

40

0 121824630365448 6042

VOLTAGE GAIN vs. GAIN CONTROL WORD

MAX3510 toc06

GAIN CONTROL WORD (DECIMAL)

VOLTAGE GAIN (dB)

f = 5MHz

f = 40MHz