MAX4444中文资料

Ultra-High-Speed, Low-Distortion, Differential-to-Single-Ended Line Receivers with Enable

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General Description

The MAX4444/MAX4445 differential line receivers offer unparalleled high-speed, low-distortion https://www.360docs.net/doc/fc1415459.html,ing a three op amp instrumentation amplifier archi-tecture, these ICs have symmetrical differential inputs and a single-ended output. They operate from ±5V supplies and are capable of driving a 100?load to ±3.7V. The MAX4444 has an internally set closed-loop gain of +2V/V, while the MAX4445 is compensated for gains of +2V/V or greater, set by an external resistor. A low-power enable mode reduces current consumption to 3.5mA.

Using current-feedback techniques, the MAX4444/MAX4445 achieve a 550MHz bandwidth while maintain-ing up to a 5000V/μs slew rate. Excellent differential gain/phase and noise specifications make these ampli-fiers ideal for a wide variety of video and RF signal-pro-cessing applications. An evaluation kit is available to speed design.

Applications

Differential-to-Single-Ended Conversion Twisted-Pair to Coaxial Converter High-Speed Instrumentation Amplifier Data Acquisition Medical Instrumentation

High-Speed Differential Line Receiver

Features

o 5000V/μs Slew Rate (MAX4444)o +2V/V Internally Fixed Gain (MAX4444)o External Gain Selection (MAX4445, A VCL

≥+2V/V)o 550MHz -3dB Bandwidth o -60dB SFDR at 5MHz

o Low Differential Gain/Phase: 0.07%/0.05°o Low Noise: 25nV/√Hz at f IN = 100kHz

o Low-Power Disable Mode Reduces Quiescent Current to 3.5mA

MAX4444/MAX4445

________________________________________________________________Maxim Integrated Products 1

Typical Operating Circuit

19-1543; Rev 0; 10/99

E V A L U A T IO

N K IT A

V A IL A B L E

Pin Configuration

Ordering Information

M A X 4444/M A X 4445

Ultra-High-Speed, Low-Distortion, Differential-to-Single-Ended Line Receivers with Enable 2_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(V CC = +5V, V EE = -5V, V EN = ≥2V, V CM = 0 , R L = ∞, REF = GND, A VCL = +2V/V, T A = T MIN to T MAX , unless otherwise noted. Typical values 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.

V CC to V EE ...........................................................................+12V Voltage on IN+, IN-, EN, OUT+,

OUT-, RG, REF..............................(V EE - 0.3V) to (V CC + 0.3V)Current Into IN+, IN-, RG, EN .............................................20mA Output Short-Circuit Duration...........................Indefinite to GND

Continuous Power Dissipation (T A = +70°C)

16-Pin Narrow SO (derate 20mW/°C above +70°C)...1600mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10sec).............................+300°C

MAX4444/MAX4445

Ultra-High Speed, Low-Distortion, Differential-to-Single-Ended Line Receivers with Enable

_______________________________________________________________________________________3

AC ELECTRICAL CHARACTERISTICS

(V CC = +5V, V EE = -5V, V EN = 5V, R L = 100?, REF = GND, A VCL = +2V/V, T A = +25°C, unless otherwise noted.)

Note 1:Input step voltage has <100ps rise (fall) time. Measured at the output from 10% to 90% (90% to 10%) level.Note 2: Includes the current noise contribution through the on-die feedback resistor.

INPUT 25mV/div OUTPUT 50mV/div 5ns/div MAX4444

SMALL-SIGNAL PULSE RESPONSE

M A X 4444t o c 07

INPUT 25mV/div OUTPUT 50mV/div 5ns/div

MAX4445

SMALL-SIGNAL PULSE RESPONSE

M A X 4445t o c 08

INPUT 250mV/div

OUTPUT 500mV/div

5ns/div

MAX4444

LARGE-SIGNAL PULSE RESPONSE

M A X 4444t o c 09

M A X 4444/M A X 4445

Ultra-High-Speed, Low-Distortion, Differential-to-Single-Ended Line Receivers with Enable 4_______________________________________________________________________________________

Typical Operating Characteristics

(V CC = +5V, V EE = -5V, V EN = 5V, V IN = V IN + - V IN -, R L = 100?, REF = GND, A V = +2V/V, T A = +25°C, unless otherwise noted.)

100M

-5-4-3-2-1013245100k

10M MAX4444

SMALL-SIGNAL GAIN vs. FREQUENCY

FREQUENCY (Hz)

G A I N (d B )

100M

-6-5-4

-3-2-102134100k

10M MAX4445

SMALL-SIGNAL GAIN vs. FREQUENCY

FREQUENCY (Hz)

G A I N (d B )

100M

-0.100.1

0.20.30.40.50.70.60.80.9

100k

10M MAX4444

GAIN FLATNESS vs. FREQUENCY

FREQUENCY (Hz)

G A I N (d B )

100M

-0.4-0.3-0.2-0.100.10.20.40.30.50.6100k

10M MAX4445

GAIN FLATNESS vs. FREQUENCY

FREQUENCY (Hz)

G A I N (d B )

100M 1G -5

-4-3-2-1013245100k 1M 10M MAX4444

LARGE-SIGNAL GAIN vs. FREQUENCY

FREQUENCY (Hz)

G A I N (d B )

100M 1G

-6

-5-4-3-2-102134

100k 1M 10M MAX4445

LARGE-SIGNAL GAIN vs. FREQUENCY

FREQUENCY (Hz)

G A I N (d B )

MAX4444/MAX4445

Ultra-High-Speed, Low-Distortion, Differential-to-Single-Ended Line Receivers with Enable

_______________________________________________________________________________________5

INPUT 250mV/div

OUTPUT 500mV/div

5ns/div MAX4445

LARGE-SIGNAL PULSE RESPONSE

M A X 4445t o c 10

1000200030004000500060000 1.00.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5

SLEW RATE vs. OUTPUT VOLTAGE SWING

OUTPUT VOLTAGE SWING (Vp-p)

S L E W R A T E (V /μs )

0.080.060.040.020-0.02-0.04-0.06-0.08

100

MAX4444

DIFFERENTIAL GAIN AND PHASE

IRE

P H A S E (d e g r e e s )

G A I N (%)

0.010-0.01-0.02-0.03-0.04-0.05

M A X 4444t o c 12

00-10-20-30

-100

10M

100M MAX4444

HARMONIC DISTORTION

vs. FREQUENCY

-40-50-60-70-80-90FREQUENCY (Hz)D I S T O R T I O N (d B )

500k

0-10-20-30-100

10M

100M

MAX4445

HARMONIC DISTORTION

vs. FREQUENCY

-40-50-60-70-80-90FREQUENCY (Hz)

D I S T O R T I O N (d B )

500k 1M 0

-100

100

10k

MAX4444

HARMONIC DISTORTION vs. LOAD RESISTANCE

-80-90

LOAD RESISTANCE (?)

D I S T O R T I O N (d B )

-60-70

-40-30-50-20-100-100

100

10k MAX4445

HARMONIC DISTORTION

vs. LOAD RESISTANCE

-80-90LOAD RESISTANCE (?)

D I S T O R T I O N (d B )

-60-70-40-30-50-20-100-10-20

-30-40-50-60-70-80-90-100

0.5 1.5 2.5 3.5 4.5 5.5 6.5MAX4444

HARMONIC DISTORTION vs. OUTPUT VOLTAGE SWING

OUTPUT VOLTAGE SWING (Vp-p)D I S T O R T I O N (d B )

-10-20

-30-40-50-60-70-80-90-100

0.5 1.5 2.5 3.5 4.5 5.5 6.5

MAX4445

HARMONIC DISTORTION vs. OUTPUT VOLTAGE SWING

OUTPUT VOLTAGE SWING (Vp-p)

D I S T O R T I O N (d B )

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = -5V, V EN = 5V, V IN = V IN + - V IN -, R L = 100?, REF = GND, A V = +2V/V, T A = +25°C, unless otherwise noted.)

-5

-10

-15

-20

-40

-15

INPUT OFFSET VOLTAGE vs. TEMPERATURE

M A X 4444/45t o c 28

TEMPERATURE (°C)

I N P U T O F F S E T V O L T A G E (m V )

M A X 4444/M A X 4445

Ultra-High-Speed, Low-Distortion, Differential-to-Single-Ended Line Receivers with Enable 6

_______________________________________________________________________________________

3.903.853.80

3.753.703.653.60

800

400

1200

1600

2000

VOLTAGE SWING vs. LOAD RESISTANCE

LOAD RESISTANCE (?)

O U T P U T V O L T A G E (V )

100k 100

10k 1M

10M

INPUT VOLTAGE NOISE DENSITY

vs. FREQUENCY

M A X 4444/45t o c 21

FREQUENCY (Hz)

V O L T A G E N O I S E (n V /H z )

100

10001

100

10k

100k

10M

INPUT CURRENT NOISE DENSITY

vs. FREQUENCY

M A X 4444/45t o c 22

FREQUENCY (Hz)

C U R R E N T N O I S E (p A /H z )

110

100

0-10-20-30-40-50-60-70-80

100k

10M 100M

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

M A X 4444/45t o c 23

FREQUENCY (Hz)

P S R R (d B )

0-10-20-30-40-50-60-70-80

100k

10M 100M

COMMON-MODE REJECTION

vs. FREQUENCY

M A X 4444/45t o c 24

FREQUENCY (Hz)

C M R (d B )

1000

100

-0.1-0.01

100k

10M 100M

MAX4444

CLOSED-LOOP OUTPUT IMPEDANCE

vs. FREQUENCY

A X 4444t o c 25

FREQUENCY (Hz)

Z O U T (?)

SHUTDOWN

PULSE 2.5V/div

OUTPUT 1V/div

200ns/div

SHUTDOWN RESPONSE

M A X 4444/45t o c 26

1416182022248

MAX4444

RECOMMENDED ISOLATION RESISTANCE vs. CAPACITIVE LOAD

M A X 4444t o c 27

CAPACITIVE LOAD (pF)

R I S O (?)

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = -5V, V EN = 5V, V IN = V IN + - V IN -, R L = 100?, REF = GND, A V = +2V/V, T A = +25°C, unless otherwise noted.)

MAX4444/MAX4445

Ultra-High-Speed, Low-Distortion, Differential-to-Single-Ended Line Receivers with Enable

_______________________________________________________________________________________7

024681012-40

-10

-25

INPUT BIAS CURRENT vs. TEMPERATURE

M A X 4444/45t o c 29

TEMPERATURE (°C)

I N P U T B I A S C U R R E N T (μA )

-40

-15

QUIESCENT CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

Q U I E S C E N T C U R R E N T (m A )

Pin Description

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = -5V, V EN = 5V, V IN = V IN + - V IN -, R L = 100?, REF = GND, A V = +2V/V, T A = +25°C, unless otherwise noted.)

35383736

39404142434445

-40

-15

QUIESCENT CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

Q U I E S C E N T C U R R E N T (m A )

M A X 4444/M A X 4445

Ultra-High-Speed, Low-Distortion, Differential-to-Single-Ended Line Receivers with Enable 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.

8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600?1999 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

_______________Detailed Description

The MAX4444/MAX4445 differential-to-single-ended line receivers offer high-speed and low-distortion per-formance, and are ideally suited for video and RF sig-nal-processing applications. These receivers offer a small-signal bandwidth of 550MHz and have a high slew rate of up to 5000V/μs. Their 120mA output capa-bility allows them to be directly coupled to data acquisi-tion systems.

__________Applications Information

Grounding Bypassing

Use the following high-frequency design techniques when designing the PC board for the MAX4444/MAX4445.

?Use a multilayer board with one layer dedicated as the ground plane.

?Do not use wire wrap or breadboards due to high inductance.

?Avoid IC sockets due to high parasitic capacitance and inductance.

?Bypass supplies with a 0.1μF capacitor. Use sur-face-mount capacitors to minimize lead inductance. ?Keep signal lines as short and straight as possible.Do not make 90°turns. Use rounded corners. Do not cross signal paths if possible.

?Ensure that the ground plane is free from voids.

Low-Power Enable Mode

The MAX4444/MAX4445 are disabled when EN goes low. This reduces supply current to only 3.5mA. As the output becomes higher impedance, the effective impedance at the output for the MAX4444 is 1.8k ?. The effective output impedance for the MAX4445 is 1.8k ?plus R GAIN .

Setting Gain (MAX4445)

The MAX4445 is stable with a minimum gain configura-tion of +2V/V. R GAIN , connected between the RG pins,sets the gain of this device as shown in Figure 1.Calculate the expected gain as follows:

Gain = (1 + 600 / R GAIN )

Driving Capacitive Loads

The MAX4444/MAX4445 are designed to drive capaci-tive loads. However, excessive capacitive loads may cause ringing or instability at the output as the phase margin of the device reduces. Adding a small series isolation resistor at the output helps reduce the ringing but slightly increases gain error (Figure 2). For recom-mended values, see Typical Operating Characteristics .

Coaxial Line Driver

The MAX4444/MAX4445 are well suited to drive coaxial cables. Their high output current capability can easily drive the 75?characteristic impedance of common coaxial cables. Adjust the gain of the MAX4445 to com-pensate for cable losses to maintain the required levels at the input of the next stage.

Chip Information

TRANSISTOR COUNT: 254SUBSTRATE CONNECTED TO V EE