Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Op-amp, differential amplifier Differential TQFN 12 (3x3)

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MAX9626/MAX9627/MAX9628

Low-Noise, Low-Distortion,

1.35GHz Fully Differential Amplifiers

19-5569; Rev 1; 2/11

Note: All devices are specified over the -40°C to +125°C

operating temperature range.

*EP = Exposed pad.

Ordering Information

Typical Operating Circuit

General Description

The MAX9626/MAX9627/MAX9628 are low-noise, low-

distortion, and high-bandwidth differential amplifier/ADC

drivers for use in applications from DC to 1.35GHz.

The exceptional low input-referred noise and low

distortion make these parts an excellent solution to

drive high-speed 12-bit to 16-bit pipeline ADCs. The

output common mode is set through the VOCM input

pin, thus eliminating the need for a coupling transformer

or AC-coupling capacitors. The ICs feature shutdown

mode for power savings and are offered in a 12-pin,

3mm x 3mm TQFN package for operation over a -40NC

to +125NC temperature range.

Applications

Communication

Medical Imaging

ATE

High-Performance Instrumentation

Features

S Low-Voltage Noise Density 3.6nV/√Hz

S Low Harmonic Distortion

HD2/HD3 of -102/-105dB at 10MHz

HD2/HD3 of -86/-80dB at 125MHz

S Factory Set Gain Options: 1V/V, 2V/V, 4V/V

S 1.35GHz Small-Signal Bandwidth

S Adjustable Output Common-Mode Voltage

S Differential-to-Differential or Single-Ended-to-

Differential Operation

S 25µA Shutdown Current

S +2.85V to +5.25V Single-Supply Voltage

S Small, 3mm x 3mm 12-Pin TQFN Package

EVALUATION KIT

AVAILABLE

MAX19588

PIPELINE ADC

VREF

DRIVING THE MAX19588

HIGH-SPEED PIPELINE ADC

SINGLE-ENDED

INPUT

RT-

IN-

IN+

OUT+

OUT-

VOCM

SHDNB

RT+

MAX9626

MAX9627

MAX9628

PART GAIN (dB) PIN-PACKAGE

TOP

MARK

MAX9626ATC+ 1 12 TQFN-EP* +ABS

MAX9627ATC+ 2 12 TQFN-EP* +ABT

MAX9628ATC+ 4 12 TQFN-EP* +ABU

Summary of content (20 pages)

PAGE 1
9-5569; Rev 1; 2/11 TION KIT EVALUA BLE IL AVA A Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers Features S Low-Voltage Noise Density 3.6nV/√Hz The MAX9626/MAX9627/MAX9628 are low-noise, lowdistortion, and high-bandwidth differential amplifier/ADC drivers for use in applications from DC to 1.35GHz. The exceptional low input-referred noise and low distortion make these parts an excellent solution to drive high-speed 12-bit to 16-bit pipeline ADCs.
PAGE 2
MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE)................................-0.3V to +5.5V IN+, IN-............................................(VEE - 2.5V) to (VCC + 0.3V) RT+, RT-..........................................(VEE - 2.5V) to (VCC + 0.3V) RT- to IN- and RT+ to IN+..................................................... Q2V VOCM, SHDN, OUT+, OUT-...........(VEE - 0.3V) to (VCC + 0.
PAGE 3
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers (VCC = +3.3V, VEE = 0V, VIN- = VIN+ = 0V, SHDN = VCC, VVOCM = VCC/2, RL = 500I (between OUT+ and OUT-), TA = -40°C to +125°C. Typical values are at +25°C, unless otherwise noted.
PAGE 4
MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.3V, VEE = 0V, VIN- = VIN+ = 0V, SHDN = VCC, VVOCM = VCC/2, RL = 500I (between OUT+ and OUT-), TA = -40°C to +125°C. Typical values are at +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS f = 10MHz, VOUT+ - VOUT= 2.0VP- P, VCC = 5V Harmonic Distortion MAX9627 MAX9628 HD f = 125MHz, VOUT+ - VOUT= 2.
PAGE 5
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers -60 HD2 -70 -80 -90 HD3 -60 HD2 -70 -80 -90 HD3 -40 MAX9626 -100 -110 10,000 -50 -60 HD2 -70 -80 -90 HD3 -100 -110 10,000 100,000 -110 10,000 100,000 100,000 FREQUENCY (kHz) FREQUENCY (kHz) FREQUENCY (kHz) HARMONIC DISTORTION vs. FREQUENCY RL = 100I, VCC = 5V HARMONIC DISTORTION vs. FREQUENCY RL = 500I, VCC = 5V HARMONIC DISTORTION vs.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +3.3V, VEE = 0V, VIN- = VIN+ = 0V, SHDN = VCC, VICM = 0V, VVOCM = VCC/2, RL = 500ω, single ended. Plot applies to all versions, unless noted otherwise.) HD2 -90 -100 -110 -65 -70 -80 -100 -110 HD3 -120 0 100 200 300 400 500 600 700 800 900 1000 LOAD (I) HARMONIC DISTORTION vs. LOAD f = 125MHz, VCC = 5V HARMONIC DISTORTION vs. LOAD f = 10MHz, VCC = 5V HARMONIC DISTORTION vs.
PAGE 7
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers -90 HD2 -100 MAX9628 HD2 -90 -100 HD3 HD2 -70 -80 HD3 -90 -100 -110 -120 -120 -120 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 OUTPUT SWING (V) OUTPUT SWING (V) OUTPUT SWING (V) SMALL-SIGNAL BANDWIDTH vs. FREQUENCY VCC = 3.3V, RL = 100I, VSIG = 100mVP-P SMALL-SIGNAL BANDWIDTH vs. FREQUENCY VCC = 5V, RL = 100I, VSIG = 100mVP-P SMALL-SIGNAL BANDWIDTH vs. FREQUENCY VCC = 3.
PAGE 8
Typical Operating Characteristics (continued) (VCC = +3.3V, VEE = 0V, VIN- = VIN+ = 0V, SHDN = VCC, VICM = 0V, VVOCM = VCC/2, RL = 500ω, single ended. Plot applies to all versions, unless noted otherwise.) 2 0 -2 GAIN (dB) 2 GAIN (dB) 4 2 0 -2 0 -2 -4 -4 -4 -6 -6 -6 -8 -8 -8 -10 -10 -10 1M 10M 100M 1G 10G 1M 10M 100M 1G 1M 10G 10M 100M 1G 10G FREQUENCY (Hz) FREQUENCY (Hz) LARGE-SIGNAL BANDWIDTH vs. FREQUENCY VCC = 5V, RL = 100I, VSIG = 2VP-P LARGE-SIGNAL BANDWIDTH vs.
PAGE 9
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers 0.6 0.4 0.2 0.2 MAX9628 0 2.0 2.5 3.0 3.5 4.0 2.0 2.5 3.0 3.5 VVOCM (V) INPUT REFERRED VOLTAGE NOISE vs. FREQUENCY INPUT REFERRED VOLTAGE NOISE vs. FREQUENCY 10 1 4.0 0.1 1 10 100 1k 100 1k MAX9628 60 10 MAX9626 50 40 MAX9627 30 20 10 MAX9628 0 0.1 1 10 100 1k 0.1 10k 100k 1M 10M 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) COMMON-MODE REJECTION RATIO vs.
PAGE 10
Typical Operating Characteristics (continued) (VCC = +3.3V, VEE = 0V, VIN- = VIN+ = 0V, SHDN = VCC, VICM = 0V, VVOCM = VCC/2, RL = 500ω, single ended. Plot applies to all versions, unless noted otherwise.) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (MAX9627) 90 80 90 80 70 60 60 60 50 40 PSRR (dB) 70 70 PSRR (dB) 50 40 50 40 30 30 30 20 20 20 10 10 10 0 0 0.1 1 10 0.01 1000 100 0.1 1 10 0 1000 100 0.01 0.
PAGE 11
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers 68 58 56 54 MAX9626 MAX9628 MAX9627 62 60 58 56 54 52 3.0 3.5 4.0 4.5 5.0 -50 5.5 S22 -80 S12 -25 0 25 50 75 10 1 100 100 1000 10,000 SUPPLY VOLTAGE (V) TEMPERATURE (°C) FREQUENCY (MHz) S PARAMETERS vs. FREQUENCY (MAX9627) S PARAMETERS vs. FREQUENCY (MAX9628) INTERMODULATION DISTORTION vs.
PAGE 12
Typical Operating Characteristics (continued) (VCC = +3.3V, VEE = 0V, VIN- = VIN+ = 0V, SHDN = VCC, VICM = 0V, VVOCM = VCC/2, RL = 500ω, single ended. Plot applies to all versions, unless noted otherwise.
PAGE 13
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers SMALL-SIGNAL TRANSIENT RESPONSE (MAX9626, VIN = 0 TO 100mV STEP, VOCM = 1.65V) VOCM TRANSIENT RESPONSE (MAX9628, VIN = 1.15V TO 2.15V STEP) VOCM TRANSIENT RESPONSE (MAX9628, VIN = 1.6V TO 1.
PAGE 14
MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.
PAGE 15
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers The MAX9626/MAX9627/MAX9628 family employs voltage feedback to implement a differential-in to differential-out amplifier. On-chip feedback resistors set the gain of the amplifier. The use of on-chip resistors not only saves cost and space, but also maximizes the overall amplifier’s performance. There are two feedback loops within the amplifier circuit. The differential feedback loop employs the onchip resistors to set the differential gain.
PAGE 16
Table 2. Typical Gain Values When Using the Internal Termination Resistors (RT and RS = 50) RG (I) RF (I) GAIN (V/V) 64 200 200 0.48 64 150 300 0.95 64 125 500 1.85 1.5 1.0 For single-ended to differential applications where the source impedance is 50I, such as the case of the Typical Application Circuit, connect an external 50I resistor at the other input to maintain symmetry and minimize the gain error.
PAGE 17
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers Setting the Output Common-Mode Voltage The ICs feature an input, VOCM, that sets the differential output common-mode voltage. Its wide range from 1.1V to VCC - 1.1V makes the amplifier family compatible with most of the high-speed pipeline differential input ADCs.
PAGE 18
MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 18 PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 19
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers 19 MAX9626/MAX9627/MAX9628 Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 20
Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers MAX9626/MAX9627/MAX9628 Revision History REVISION NUMBER REVISION DATE 0 9/10 Initial release 1 2/11 Updated shutdown current value, updated Electrical Characteristics table, updated. Internal Terminations section, and added new typical operating characteristics DESCRIPTION PAGES CHANGED — 1–7, 14 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.