MAXIM MAX2034 User Manual

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General Description

The MAX2034 four-channel, low-power, ultra-low-noise
preamplifier is designed for ultrasound and medical
instrumentation applications. Each low-noise amplifier
has a single-ended input, differential output, a highly
accurate 19dB fixed gain, and a wide -3dB bandwidth
of 70MHz. The high-gain accuracy of the amplifier
allows for exceptional channel-to-channel gain match­ing, which is necessary for high-performance ultra­sound-imaging applications. The MAX2034 also
includes an on-chip programmable input impedance
feature that allows the device to be compatible with a
variety of common source impedances ranging from
50Ω to 1kΩ. The input impedance of each amplifier
uses a feedback topology for active impedance match­ing. The active input impedance matching feature
achieves an exceptionally low 2.2dB noise figure with a
source and input impedance of 200Ω.

The MAX2034 has excellent dynamic and linearity per­formance characteristics optimized for all ultrasound­imaging modalities including second harmonic 2D
imaging and continuous wave Doppler. The device
achieves a second harmonic distortion of -68dBc at
V

OUT

= 1V

P-P

and fIN= 5MHz, and an ultrasound-spe­cific* two-tone third-order intermodulation distortion per­formance of -55dBc at V

OUT

= 1V

P-P

and fIN= 5MHz.

The MAX2034 is also optimized for quick overload
recovery for operation under the large input signal con­ditions typically found in ultrasound input-buffer imag­ing applications.

The MAX2034 is available in a 48-pin thin QFN pack­age with an exposed paddle. Electrical performance is
guaranteed over a 0°C to +70°C temperature range.

Features

♦ High-Level Integration of 4 Channels
♦ Digitally Programmable Input Impedance (RIN) of

50Ω, 100Ω, 200Ω, and 1kΩ

♦ Integrated Input Clamp
♦ Integrated Input-Damping Capacitor
♦ Ultra-Low 2.2dB Noise Figure at R

S

= RIN= 200Ω

♦ 70MHz, -3dB Bandwidth
♦ Low 58mW/Channel Power Dissipation
♦ HD2 of -68dBc at V

OUT

= 1V

P-P

and fIN= 5MHz for
Exceptional Second Harmonic Imaging
Performance

♦ Two-Tone Ultrasound-Specific* IMD3 of -55dBc at

V

OUT

= 1V

P-P

and fIN= 5MHz for Exceptional

PW/CW Doppler Performance

♦ Quick Large-Signal Overload Recovery
♦ Single +5V Supply Operation
♦ Sleep Mode

MAX2034

Quad-Channel, Ultra-Low-Noise Amplifier with

Digitally Programmable Input Impedance

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

MAX2034

THIN QFN

13

14

15

16

17

18

19

20

21

22

23

24

INC4

INB4

GND

V

CC

V

CC

D1

D0

V

CC

GND

GND

OUT4-

OUT4+

48

47

46

45

44

43

42

41

40

39

38

37

1

2

345678910

11

12

IN1

ZF1

GND

V

CC

V

CC

PD

D2

V

CC

GND

GND

V

CC

GND

IN4

ZF4

INB3

INC3

IN3

ZF3

INB2

INC2

IN2

ZF2

INB1

INC1

36

35

34 33 32 31 30 29 28 27

26

25

GND

GND

VCCOUT3-

OUT3+

VCCOUT2-

OUT2+

GND

V

CC

OUT1-

OUT1+

Pin Configuration

19-3969; Rev 1; 3/07

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.

PART

TEMP

RANGE

PIN­PACKAGE

PKG

CODE

MAX2034CTM+

48 Thin QFN-EP**
(7mm x 7mm)

T4877-4

MAX2034CTM

48 Thin QFN-EP**
(7mm x 7mm)

T4877-4

MAX2034CTM+T

48 Thin QFN-EP**
(7mm x 7mm)

T4877-4

MAX2034CTM-T

48 Thin QFN-EP**
(7mm x 7mm)

T4877-4

Ordering Information

**EP = Exposed paddle.
+Denotes lead-free package.
T = Tape-and-reel package.

*See the Ultrasound-Specific IMD3 Specification in the

Applications Information section.

Typical Application Circuit appears at end of data sheet.

Applications

Ultrasound Imaging

Sonar Signal Amplification

0°C to +70°C

0°C to +70°C

0°C to +70°C

0°C to +70°C

MAX2034

Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(MAX2034 Typical Application Circuit, VCC= +4.75V to +5.25V, no input signal applied between IN1–IN4 and GND, TA= 0°C to +70°C.
Typical values are at V

CC

= +5.0V and TA= +25°C, unless otherwise noted.) (Note 1)

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

Any Other Pins to GND...............................-0.3V to (V

CC

+ 0.3V)

IN_ to INB_ ..................................................................-2V to +2V

INC_ to GND .....................................................-24mA to +24mA

Continuous Power Dissipation (T

A

= +70°C)

48-Pin TQFN (derated 40mW/°C above +70°C) ........3200mW

Operating Temperature Range...............................0°C to +70°C

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

θJC...................................................................................0.8°C/W

θ

JA

....................................................................................25°C/W

Storage Temperature Range .............................-40°C to +150°C

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

PARAMETER

CONDITIONS

UNITS

Supply Voltage V

CC

V

I

CC

Normal mode (PD = 0), no signals applied, see
the Typical Operating Characteristics for I

CC

as

a function of input signal

Total Supply Current

4

mA

LOGIC INPUTS (PD, D2, D1, D0)

Input High Voltage V

IH

V

Input Low Voltage V

IL

V

Input Current with Logic-High I

IH

1µA

Input Current with Logic-Low I

IL

1µA

AC ELECTRICAL CHARACTERISTICS

(MAX2034 Typical Application Circuit, VCC= +4.75V to +5.25V, source impedance RS= 200Ω, PD = 0, D2/D1/D0 = 0/1/0 (RIN= 200Ω),
signal AC-coupled to IN_, INB_ is AC grounded, V

OUT

is the differential output between OUT_+ and OUT_-, f

IN_

= 5MHz, RL= 200Ω

between the differential outputs, C

L

= 20pF from each output to ground, TA= 0°C to +70°C. Typical values are at VCC= 5.0V and TA=

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

PARAMETER

CONDITIONS

UNITS

D2/D1/D0 = 0/0/0 53

D2/D1/D0 = 0/0/1

D2/D1/D0 = 0/1/0

Input Resistance R

IN

D2/D1/D0 = 0/1/1

Ω

Typ i cal Inp ut Resi stance V ar i ati on
fr om N om i nal P r og r am m ed

%

Input Capacitance C

IN

40 pF

Gain A

V

(OUT_+ - OUT_-) / IN_ 19 dB

Part-to-Part Gain Variation from
Nominal

T

A

= +25oC, RL = 200Ω ±10% 0

dB

-3dB Small-Signal Gain
Bandwidth

f

-3dB

D2/D1/D0 = 0/0/0, (50Ω input impedance),
V

OUT

= 0.2V

P-P

70

MHz

Slew Rate

V/µs

SYMBOL

MIN TYP MAX

4.75 5.0 5.25

46.5 54.5

I

CC,PD

SYMBOL

Sleep mode (PD = 1), V

= 112mV

IN_

at 5MHz 0.8

P-P

4.0

MIN TYP MAX

105

206

870

±1

±0.1 ±0.5

280

1.0

MAX2034

Quad-Channel, Ultra-Low-Noise Amplifier with

Digitally Programmable Input Impedance

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2034 Typical Application Circuit, VCC= +4.75V to +5.25V, source impedance RS= 200Ω, PD = 0, D2/D1/D0 = 0/1/0 (RIN= 200Ω),
signal AC-coupled to IN_, INB_ is AC grounded, V

OUT

is the differential output between OUT_+ and OUT_-, f

IN_

= 5MHz, RL= 200Ω

between the differential outputs, C

L

= 20pF from each output to ground, TA= 0°C to +70°C. Typical values are at VCC= 5.0V and TA=

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

RS = RIN = 50Ω

RS = RIN = 100Ω

RS = RIN = 200Ω

Noise Figure NF

R

S

= RIN = 1000Ω

dB

Input-Referred Noise Voltage D2 = 1 (high input impedance), f

IN_

= 5MHz

nV/√Hz

Input-Referred Noise Current D2 = 1 (high input impedance), f

IN_

= 5MHz

pA/√Hz

f

IN_

= 5MHz, V

OUT

= 1V

P-P

differential

Second Harmonic HD2

f

IN_

= 10MHz, V

OUT

= 1V

P-P

differential

dBc

f

IN_

= 5MHz, V

OUT

= 1V

P-P

differential

Third Harmonic HD3

f

IN_

= 10MHz, V

OUT

= 1V

P-P

differential

dBc

4.99MHz tone relative to the second tone at

5.01MHz, which is 25dB lower than the first tone
at 5.00MHz, V

OUT

= 1V

P-P

differential

Two-Tone Intermodulation
Distortion (Note 2)

IMD3

7.49MHz tone relative to the second tone at

7.51MHz, which is 25dB lower than the first tone
at 7.50MHz, V

OUT

= 1V

P-P

differential

dBc

Maximum Output Signal
Amplitude

Differential output

V

P-P

Gain Compression

Gain at V

IN_

= 112mV

P-P

relative to gain at

V

IN_

= 550mV

P-P

3dB

Output Common-Mode Level

V

Output Impedance Single-ended

Ω

Phase Matching Between
Channels

Phase difference between channels with V

IN_

=

195mV peak (-3dB full scale), f

IN_

= 10MHz

deg

Channel-to-Channel Crosstalk

50 66 dB

Switch Time from Normal to Sleep
Mode

Supply current settles to 90% of nominal sleep­mode current I

CC,PD

ms

Switch Time from Sleep to Normal
Mode

V

OUT

settles to 90% of final 1V

P-P

output

ms

Note 1: Min and max limits at TA= +25°C and +70°C are guaranteed by design, characterization, and/or production test.
Note 2: See the Ultrasound-Specific IMD3 Specification in the Applications Information section.

f

= 10MHz, V

IN_

= 1V

OUT

adjacent channels

P-P,

4.1

2.9

2.2

1.4

0.87

2.1

-50 -68

-66

-50

-44

-45 -55

-52

4.4

0.5

2.45

5.3

±1.5

0.3

0.3

MAX2034

Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance

4 _______________________________________________________________________________________

Typical Operating Characteristics

(MAX2034 Typical Application Circuit, VCC= +4.75V to +5.25V, source impedance RS= 200Ω, PD = 0, D2/D1/D0 = 0/1/0 (RIN= 200Ω),
signal AC-coupled to IN_, INB_ is AC grounded, V

OUT

is the differential output between OUT_+ and OUT_-, f

IN_

= 5MHz, RL= 200Ω

between the differential outputs, C

L

= 20pF from each output to ground, TA= 0°C to +70°C, unless otherwise specified.)

25

-5

0.1 10 1001 1000

SMALL-SIGNAL BANDWIDTH

vs. FREQUENCY

MAX2034 toc01

FREQUENCY (MHz)

GAIN (dB)

0

5

10

15

20

V

IN_

= 112mV

P-P

,

R

IN

= 200Ω

25

-5

0.1 10 1001 1000

SMALL-SIGNAL BANDWIDTH

vs. FREQUENCY

MAX2034 toc02

FREQUENCY (MHz)

GAIN (dB)

0

5

10

15

20

V

IN

= 112mV

P-P

R

IN

= 50Ω

25

-5

0.1 10 1001 1000

LARGE-SIGNAL BANDWIDTH

vs. FREQUENCY

MAX2034 toc03

FREQUENCY (MHz)

GAIN (dB)

0

5

10

15

20

V

IN_

= 500mV

P-P

,

RIN = 200Ω

25

-5

0.1 10 1001 1000

LARGE-SIGNAL BANDWIDTH

vs. FREQUENCY

MAX2034 toc04

FREQUENCY (MHz)

GAIN (dB)

0

5

10

15

20

V

IN

= 500mV

P-P

RIN = 50Ω

30

40

35

55

50

45

65

60

70

02010 30 40 50

COMPLEX INPUT IMPEDANCE MAGNITUDE

vs. FREQUENCY

MAX2034 toc05

FREQUENCY (MHz)

I

Z

IN

I

D2/D1/D0 = 0/0/0

R

IN

= 50Ω

60

80

70

110

100

90

130

120

140

010515202530

COMPLEX INPUT IMPEDANCE MAGNITUDE

vs. FREQUENCY

MAX2034 toc06

FREQUENCY (MHz)

I

Z

IN

I

D2/D1/D0 = 0/0/1

RIN = 100Ω

100

150

125

200

175

250

225

275

084121620

COMPLEX INPUT IMPEDANCE MAGNITUDE

vs. FREQUENCY

MAX2034 toc07

FREQUENCY (MHz)

I

Z

IN

I

D2/D1/D0 = 0/1/0

R

IN

= 200Ω

100

400

250

700

550

1000

850

1150

084121620

COMPLEX INPUT IMPEDANCE MAGNITUDE

vs. FREQUENCY

MAX2034 toc08

FREQUENCY (MHz)

I

Z

IN

I

D2/D1/D0 = 0/1/1

R

IN

= 1kΩ

-80

-60

-70

-40

-50

-30

-20

030

HARMONIC DISTORTION

vs. FREQUENCY

MAX2034 toc09

FREQUENCY (MHz)

HARMONIC DISTORTION (dBc)

105152520

V

OUT

= 1V

P-P

DIFFERENTIAL

RL = 200Ω

THIRD HARMONIC

SECOND HARMONIC