19-5569; 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. 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. 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-toDifferential Operation S 25µA Shutdown Current S +2.85V to +5.25V Single-Supply Voltage S Small, 3mm x 3mm 12-Pin TQFN Package Ordering Information Applications Communication PIN-PACKAGE TOP MARK 1 12 TQFN-EP* +ABS 2 12 TQFN-EP* +ABT 4 12 TQFN-EP* +ABU PART GAIN (dB) ATE MAX9626ATC+ High-Performance Instrumentation MAX9627ATC+ MAX9628ATC+ Medical Imaging Note: All devices are specified over the -40°C to +125°C operating temperature range. *EP = Exposed pad. Typical Operating Circuit VCC VCC SHDNB MAX9626 MAX9627 MAX9628 RT- SINGLE-ENDED INPUT RS RS RT IN- RF RG OUT+ RG IN+ OUT- MAX19588 PIPELINE ADC VREF RF RT RT+ VOCM VEE DRIVING THE MAX19588 HIGH-SPEED PIPELINE ADC ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. MAX9626/MAX9627/MAX9628 General Description 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 + 0.3V) Output Short-Circuit Duration (OUT+ to OUT-)........................ 1s Continuous Input Current (any pin except VEE, VCC, OUT+, OUT-)..................... Q20mA Continuous Power Dissipation (TA = +70NC) 12-Pin TQFN Multilayer Board (deration 16.7mW/NC above +70NC)...........................................................1333.3mW BJA.........................................................................60mW/NC BJC.........................................................................11mW/NC Operating Temperature Range......................... -40NC to +125NC Junction Temperature......................................................+150NC Storage Temperature Range............................. -65NC to +150NC Lead Temperature (soldering, 10s).................................+300NC Soldering Temperature (reflow).......................................+260NC 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. ELECTRICAL CHARACTERISTICS (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 MIN TYP MAX UNITS DC SPECIFICATIONS Supply Voltage Range Supply Current Power-Supply Rejection Ratio Differential Voltage Gain VCC ICC PSRR GDIFF Gain Error 2 VICM 2.85 SHDN = VCC SHDN = GND 5.25 V 59 80 mA 25 50 FA VVCOM = VCC/2, 2.85V P VCC P 5.25V, -40NC P TA P +85NC MAX9626 66 89 MAX9627 66 92 MAX9628 64 92 VVCOM = VCC/2, 2.85V P VCC P 5.25V, -40NC P TA P +125NC MAX9626 60 89 MAX9627 63 92 MAX9628 64 92 VOUT+, VOUT- = -1V to +1V VOUT+, VOUT- = -1V to +1V Input Offset Voltage Common-Mode Input Voltage Range (Note 2) Guaranteed by PSRR MAX9626 1 MAX9627 2 MAX9628 4 dB V/V MAX9626 -2 ±0.2 +2 MAX9627 -2 ±0.2 +2 MAX9628 -2 +2 ±11 ±8 Differential input, VIN- = VIN+ = VCC/2, TA = +25NC MAX9626 ±0.2 2 MAX9627 2 MAX9628 2 ±8 Differential input, VIN- = VIN+ = VCC/2 TA = -40°C to +125NC MAX9626 2 ±13 MAX9627 2 ±10 MAX9628 2 Guaranteed by CMRR MAX9626 -1.5 ±10 +1.5 MAX9627 -0.75 +1.5 MAX9628 -0.4 +1.5 % mV V 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.) (Note 1) PARAMETER Common-Mode Rejection Ratio SYMBOL CMRR MIN TYP MAX9626 CONDITIONS 46 62 MAX9627 50 69 MAX9628 VOH VOCM = VCC VOL VVOCM = 0V Output Voltage Swing Output Current Common-Mode Input Resistance Differential Input Resistance Input Termination Resistance 54 79 VCC 1 VCC 0.8 VEE + 0.65 Source: VCC - VOUT = 0.95V 100 Sink: VOUT - VEE = 0.95V 100 MAX9626 200 MAX9627 225 MAX9628 312 MAX9626 267 MAX9627 225 MAX9628 209 RT- to IN- and RT+ to IN+ 64 MAX UNITS dB VEE + 0.9 V mA I I I AC SPECIFICATIONS 3dB Large-Signal Bandwidth 0.1dB Large-Signal Bandwidth Slew Rate AC Power-Supply Rejection Ratio Input Voltage Noise Noise Figure LSB3dB LSB0.1dB SR AC PSRR eN NF VOUT+ - VOUT- = 2.0VP-P VOUT+ - VOUT- = 2.0VP-P VOUT+ - VOUT- = 2.0VP-P VVOCM = 1.65V, f = 10MHz f = 10MHz RS = 50I MAX9626 1150 MAX9627 1350 MAX9628 1000 MAX9626 80 MAX9627 80 MAX9628 90 MAX9626 6500 MAX9627 6100 MAX9628 5500 MAX9626 64 MAX9627 65 MAX9628 62 MAX9626 5.7 MAX9627 4.3 MAX9628 3.6 MAX9626 22.2 MAX9627 19.7 MAX9628 18.1 MHz MHz V/Fs dB nV/√Hz dB 3 MAX9626/MAX9627/MAX9628 ELECTRICAL CHARACTERISTICS (continued) 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= 2.0VP-P, VCC = 5V Capacitive Load MAX9626 CLOAD MAX9626 MAX9627 MAX9628 MIN TYP HD2 -98 HD3 -103 HD2 -102 HD3 -105 HD2 -91 HD3 -97 HD2 -80 HD3 -80 HD2 -86 HD3 -80 HD2 -80 HD3 -75 No sustained oscillation Power-Up Time MAX UNITS dBc 10 pF 2.3 Fs VOCM INPUT PIN Input Voltage Range Output Common-Mode Rejection Ratio (Note 3) Guaranteed by VOCM CMRR test V 52 64 0.98 0.99 1.00 V/V Input Offset Voltage (Note 3) 12 1 ±21 10 mV Input Bias Current Input Impedance 35 MI Output Common-Mode Gain (Note 3) CMRRVOCM VCC 1.1 1.1 GVOCM VVOCM = 1.1V to VCC -1.1V, TA = -40°C to +125NC dB FA Output Balance Error DVOUT = 1VPP , f = 10MHz -77 dB -3dB Small-Signal Bandwidth VVOCM = 0.1VP-P 700 MHz SHDN INPUT PIN Input Voltage Input Current VIL 0.8 VIH 1.2 IIL VSHDN = 0V 0.01 2 IIH VSHDN = VCC 3.3 20 Turn-On Time tON 0.6 Turn-Off Time tOFF 0.2 Note 1: All devices are 100% production tested at TA = +25°C. Temperature limits are guaranteed by design. Note 2: Input voltage range is a function of VOCM. See the Input Voltage Range section for details. Note 3: Limits are guaranteed by design based on bench characterization. Testing is functional using different limits. 4 V FA Fs 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. FREQUENCY RL = 1kI, VCC = 5V -60 HD2 -70 -80 -90 HD3 -100 -60 HD2 -70 -80 -90 -100 HD3 -40 -50 -110 -110 10,000 MAX9627 -60 HD2 -70 -80 -90 -100 HD3 -110 -120 10,000 100,000 MAX9626 toc06 -50 MAX9627 HARMONIC DISTORTION (dBc) -50 -40 MAX9626 toc05 MAX9627 HARMONIC DISTORTION (dBc) MAX9626 toc04 -40 -120 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. FREQUENCY RL = 1kI, VCC = 5V -50 -60 HD2 -70 -80 HD3 -90 -40 -50 MAX9628 -60 -70 -80 -90 -100 -110 -100 10,000 100,000 FREQUENCY (kHz) -40 -50 MAX9626 toc09 MAX9628 HARMONIC DISTORTION (dBc) MAX9626 toc07 -40 HARMONIC DISTORTION (dBc) HARMONIC DISTIORTION (dBc) -50 HARMONIC DISTORTION vs. FREQUENCY RL = 1kI, VCC = 5V MAX9626 toc03 MAX9626 -100 HARMONIC DISTIORTION (dBc) MAX9626 toc02 -50 -40 MAX9626 toc08 HARMONIC DISTIORTION (dBc) MAX9626 HARMONIC DISTIORTION (dBc) MAX9626 toc01 -40 HARMONIC DISTORTION vs. FREQUENCY RL = 500I, VCC = 5V HARMONIC DISTIORTION (dBc) HARMONIC DISTORTION vs. FREQUENCY RL = 100I, VCC = 5V MAX9628 -60 -70 HD2 -80 -90 HD3 -100 -110 -120 10,000 100,000 FREQUENCY (kHz) -120 10,000 100,000 FREQUENCY (kHz) 5 MAX9626/MAX9627/MAX9628 Typical Operating Characteristics (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.) 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. LOAD f = 125MHz, VCC = 5V -70 -80 -90 HD2 -100 MAX9628 -70 -80 HD2 -90 -100 HD3 -60 -110 0 100 200 300 400 500 600 700 800 900 1000 -70 HD3 -75 -80 -85 HD2 -90 -95 -120 -120 MAX9628 -65 HARMONIC DISTORTION (dB) HD3 -60 MAX9626 toc14 MAX9627 HARMONIC DISTORTION (dB) MAX9626 toc13 -100 0 100 200 300 400 500 600 700 800 900 1000 0 100 200 300 400 500 600 700 800 900 1000 LOAD (I) LOAD (I) HARMONIC DISTORTION vs. DIFFERENTIAL OUTPUT SWING f = 10MHz, VCC = 5V HARMONIC DISTORTION vs. DIFFERENTIAL OUTPUT SWING f = 125MHz, VCC = 5V HARMONIC DISTORTION vs. DIFFERENTIAL OUTPUT SWING f = 10MHz, VCC = 5V -70 -80 HD2 -100 HD3 -120 -60 MAX9626 -70 -80 -90 HD2 -100 -110 HD3 -120 -60 MAX9626 toc16 MAX9626 HARMONIC DISTORTION (dB) MAX9626 toc15b LOAD (I) MAX9627 HARMONIC DISTORTION (dB) HARMONIC DISTORTION (dB) HD2 -90 0 100 200 300 400 500 600 700 800 900 1000 -110 6 -80 LOAD (I) -60 -110 -70 LOAD (I) -40 -90 MAX9627 -90 0 100 200 300 400 500 600 700 800 900 1000 -60 HD2 -85 HD3 -120 -50 HD3 -75 -60 MAX9626 toc12 MAX9626 MAX9626 toc15 -80 MAX9626 toc11 -70 -60 HARMONIC DISTORTION vs. LOAD f = 10MHz, VCC = 5V MAX9626 toc15c HARMONIC DISTORTION (dB) MAX9626 HARMONIC DISTORTION (dB) MAX9626 toc10 -60 HARMONIC DISTORTION vs. LOAD f = 125MHz, VCC = 5V HARMONIC DISTORTION (dB) HARMONIC DISTORTION vs. LOAD f = 10MHz, VCC = 5V HARMONIC DISTORTION (dB) MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers -70 -80 -90 HD3 -100 -110 HD2 -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 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) 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 = 3.3V, RL = 100I, VSIG = 100mVP-P 6 MAX9626 8 10 MAX9626 toc21 10 MAX9626 toc20 MAX9626 8 6 6 2 2 -2 GAIN (dB) 4 2 GAIN (dB) 4 0 -2 0 -2 -4 -4 -4 -6 -6 -6 -8 -8 -8 -10 -10 -10 1M 10M 100M 1G 1M 10G 10M 100M 1G MAX9627 8 4 0 MAX9626 toc22 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 10 10G 1M 10M 100M 1G 10G FREQUENCY (Hz) FREQUENCY (Hz) SMALL-SIGNAL BANDWIDTH vs. FREQUENCY VCC = 5V, RL = 100I, VSIG = 100mVP-P 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 10 MAX9627 8 10 6 MAX9628 8 10 6 8 2 2 GAIN (dB) 4 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 FREQUENCY (Hz) 10G 1M 10M 100M FREQUENCY (Hz) 1G 10G MAX9628 6 4 0 MAX9626 toc25 FREQUENCY (Hz) MAX9626 toc23 GAIN (dB) -80 MAX9628 -110 -110 GAIN (dB) -70 -60 HARMONIC DISTORTION (dB) HD3 -80 MAX9626 toc18 -70 -60 HARMONIC DISTORTION vs. DIFFERENTIAL OUTPUT SWING f = 125MHz, VCC = 5V MAX9626 toc24 HARMONIC DISTORTION (dB) MAX9627 HARMONIC DISTORTION (dB) MAX9626 toc17 -60 HARMONIC DISTORTION vs. DIFFERENTIAL OUTPUT SWING f = 10MHz, VCC = 5V MAX9626 toc19 HARMONIC DISTORTION vs. DIFFERENTIAL OUTPUT SWING f = 125MHz, VCC = 5V 1M 10M 100M 1G 10G FREQUENCY (Hz) 7 MAX9626/MAX9627/MAX9628 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.) 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. FREQUENCY VCC = 3.3V, RL = 100I, VSIG = 2VP-P LARGE-SIGNAL BANDWIDTH vs. FREQUENCY VCC = 5V, RL = 100I, VSIG = 2VP-P 6 MAX9628 8 10 6 6 4 2 2 2 -2 GAIN (dB) 4 GAIN (dB) 4 0 0 -2 0 -2 -4 -4 -4 -6 -6 -6 -8 -8 -8 -10 -10 -10 100M 1G 1G 1.0 MAX9626 MAX9628 0.4 2.0 1.8 1.6 1.4 0.8 MAX9628 0.4 0.2 0 0 RL (I) MAX9626 MAX9627 10M 100M 1G 10G SMALL-SIGNAL BANDWIDTH vs. VVOCM 1.0 0.6 1M FREQUENCY (Hz) 1.2 0.2 0 100 200 300 400 500 600 700 800 900 1000 10G MAX9626 toc33 MAX9627 1.2 0.6 100M LARGE-SIGNAL BANDWIDTH vs. RESISTIVE LOAD 1.4 0.8 10M SMALL-SIGNAL BANDWIDTH vs. RESISTIVE LOAD MAX9626 toc32 1.6 1M FREQUENCY (Hz) 2.0 1.8 10G FREQUENCY (Hz) 1.4 SMALL SIGNAL BANDWIDTH (GHz) 10M LARGE-SIGNAL BANDWIDTH (GHz) 1M MAX9628 8 1.2 VCC = 5V MAX9626 toc34 10 MAX9626 toc30 MAX9627 MAX9626 toc31 FREQUENCY (Hz) 8 GAIN (dB) 6 4 10 8 6 MAX9627 8 4 MAX9626 toc29 GAIN (dB) 6 MAX9626 8 10 MAX9626 toc27 MAX9626 8 10 MAX9626 toc26 10 LARGE-SIGNAL BANDWIDTH vs. FREQUENCY VCC = 3.3V, RL = 100I, VSIG = 2VP-P LARGE-SIGNAL BANDWIDTH vs. FREQUENCY VCC = 5V, RL = 100I, VSIG = 2VP-P MAX9626 toc28 LARGE-SIGNAL BANDWIDTH vs. FREQUENCY VCC = 3.3V, RL = 100I, VSIG = 2VP-P SMALL-SIGNAL BANDWIDTH (GHz) MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers VCC = 3.3V 1.0 0.8 0.6 0.4 0.2 MAX9626 0 100 200 300 400 500 600 700 800 900 1000 RL (I) 0 1.0 1.5 2.0 2.5 VVOCM (V) 3.0 3.5 4.0 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. FREQUENCY (MAX9626) COMMON-MODE REJECTION RATIO vs. FREQUENCY (MAX9627) COMMON-MODE REJECTION RATIO vs. FREQUENCY (MAX9628) 70 40 30 20 10 60 60 50 50 40 30 1 10 FREQUENCY (MHz) 100 1000 40 30 20 20 10 10 0 0 70 CMRR (dB) CMRR (dB) 50 80 MAX9626 toc42 80 MAX9626 toc41 60 MAX9626 toc37 10k 100k 1M 10M NOISE FIGURE vs. FREQUENCY 100 10k 100k 1M 10M 70 0.1 10 70 1 0.1 1 FREQUENCY (Hz) NOISE FIGURE (dB) 100 1000 INPUT REFERRED VOLTAGE NOISE (nV/√Hz) MAX9627 MAX9626 toc38 VVOCM (V) 1000 10 1 1.5 1.0 MAX9626 toc39 1.5 1.0 INPUT REFERRED VOLTAGE NOISE (nV/√Hz) 0.4 MAX9627 0 CMRR (dB) 0.6 100 MAX9626 toc40 0.8 MAX9626 MAX9626 toc43 1.0 VCC = 5V VCC = 3.3V 0.8 1000 INPUT REFERRED VOLTAGE NOISE (nV/√Hz) VCC = 3.3V 1.0 MAX9626 toc36 VCC = 5V 1.2 1.2 SMALL-SIGNAL BANDWIDTH (GHz) 1.4 MAX9626 toc35 SMALL-SIGNAL BANDWIDTH (GHz) 1.6 INPUT REFERRED VOLTAGE NOISE vs. FREQUENCY SMALL-SIGNAL BANDWIDTH vs. VVOCM SMALL-SIGNAL BANDWIDTH vs. VVOCM 0 0.1 1 10 FREQUENCY (MHz) 100 1000 0.1 1 10 100 1000 FREQUENCY (MHz) 9 MAX9626/MAX9627/MAX9628 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.) 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 0.1 1 10 1000 100 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) OFFSET VOLTAGE HISTOGRAM (MAX9626) OFFSET VOLTAGE HISTOGRAM (MAX9627) OFFSET VOLTAGE HISTOGRAM (MAX9628) 40 OCCURANCE (%) 25 20 15 60 35 50 OCCURANCE (%) 30 45 30 25 20 15 10 10 5 MAX9626 toc47 50 MAX9626 toc45 35 MAX9626 toc46 0.01 40 30 20 10 5 0 0 0 -3 -2 -1 0 1 -4 -3 -2 -1 0 -4 1 -3 -2 -1 0 1 DIFFERENTIAL OFFSET VOLTAGE (mV) DIFFERENTIAL OFFSET VOLTAGE (mV) DIFFERENTIAL OFFSET VOLTAGE (mV) GAIN ERROR HISTOGRAM (MAX9626) GAIN ERROR HISTOGRAM (MAX9627) GAIN ERROR HISTOGRAM (MAX9628) 45 40 50 OCCURANCE (%) 35 30 25 20 15 10 60 40 30 20 MAX9626 toc50 60 MAX9626 toc48 50 50 OCCURANCE (%) -4 MAX9626 toc49 PSRR (dB) 80 100 MAX9626 toc44a 90 OCCURANCE (%) 100 MAX9626 toc44 100 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (MAX9628) MAX9626 toc44b POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (MAX9626) OCCURANCE (%) MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers 40 30 20 10 10 5 0 0 GAIN ERROR (%) 10 0 0 -1.0 -0.8 -0.6 -0.4 -0.2 0.2 0.4 -1.0 -0.8 -0.6 -0.4 -0.2 0 GAIN ERROR (%) 0.2 0.4 -1.0 -0.8 -0.6 -0.4 -0.2 0 GAIN ERROR (%) 0.2 0.4 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. FREQUENCY (MAX9626, VCC = 5V) -40 S22 -80 S11 -40 -60 S22 -80 S12 -100 -100 -120 -120 1 10 100 1000 FREQUENCY SPACING = 100kHz -55 S12 IMD2, VOUT = 3VP-P -60 IMD2, VOUT = 2VP-P -65 -70 -75 -80 IMD3, VOUT = 3VP-P -85 -90 IMD3, VOUT = 2VP-P -95 1 10,000 -50 HARMONIC DISTORTION (dBc) -20 GAIN MAGNITUDE (dB) S11 MAX9626 toc52c -20 -60 0 MAX9626 toc52b 0 10 100 1000 10,000 50 75 100 125 150 175 200 INTERMODULATION DISTORTION vs. FREQUENCY (MAX9626, VCC = 3.3V) INTERMODULATION DISTORTION vs. FREQUENCY (MAX9627, VCC = 5V) INTERMODULATION DISTORTION vs. FREQUENCY (MAX9627, VCC = 3.3V) IMD2, VOUT = 2VP-P -60 IMD2, VOUT = 1VP-P -65 -70 -75 IMD3, VOUT = 1VP-P -80 IMD3, VOUT = 2VP-P -85 FREQUENCY SPACING = 100kHz -55 -60 IMD2, VOUT = 3VP-P IMD2, VOUT = 2VP-P -65 -70 -75 IMD3, VOUT = 3VP-P -80 IMD3, VOUT = 2VP-P 75 100 125 150 FREQUENCY (MHz) 175 200 -60 IMD2, VOUT = 2VP-P -65 IMD2, VOUT = 1VP-P -70 -75 IMD3, VOUT = 1VP-P IMD3, VOUT = 2VP-P -80 -90 -90 50 FREQUENCY SPACING = 100kHz -55 -85 -85 -90 -50 HARMONIC DISTORTION (dBc) -55 -50 HARMONIC DISTORTION (dBc) FREQUENCY SPACING = 100kHz MAX9626 toc52g FREQUENCY (MHz) MAX9626 toc52f FREQUENCY (MHz) MAX9626 toc52e FREQUENCY (MHz) -50 HARMONIC DISTORTION (dBc) -60 -120 50 2.5 -40 -100 MAX9626 52 50 GAIN MAGNITUDE (dB) 64 S11 MAX9626 toc52d 60 -20 GAIN MAGNITUDE (dB) 66 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) MAX9628 0 MAX9626 toc52 MAX9627 70 MAX9626 toc51 64 62 S PARAMETERS vs. FREQUENCY (MAX9626) SUPPLY CURRENT vs. TEMPERATURE MAX9626 toc52a SUPPLY CURRENT vs. SUPPLY VOLTAGE 50 75 100 125 150 FREQUENCY (MHz) 175 200 50 75 100 125 150 175 200 FREQUENCY (MHz) 11 MAX9626/MAX9627/MAX9628 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.) 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.) IMD2, VOUT = 2VP-P -70 -75 -80 IMD3, VOUT = 2VP-P -85 IMD3, VOUT = 3VP-P -60 -65 -75 -95 -90 100 125 150 175 IMD3, VOUT = 2VP-P -80 -90 75 IMD2, VOUT = 1VP-P -70 -85 50 IMD2, VOUT = 2VP-P 200 75 100 125 -20 -30 -40 -50 -60 -70 -80 IMD3, VOUT = 1VP-P 50 MAX9626 toc52j -55 0 -10 OUTPUT BALANCE ERROR (dB) -65 FREQUENCY SPACING = 100kHz -90 150 175 1 200 10 100 1000 10,000 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) OUTPUT IMPEDANCE vs. FREQUENCY VCOM SMALL-SIGNAL GAIN vs. FREQUENCY VOCM TRANSIENT RESPONSE (MAX9626, VIN = 1.6V TO 1.7V STEP) 10 SMALL-SIGNAL GAIN (dB) 10 1 0.1 MAX9626 toc52m 15 MAX9626 toc52k 100 MAX9626 toc52l HARMONIC DISTORTION (dBc) IMD2, VOUT = 3VP-P -60 -50 MAX9626 toc52i FREQUENCY SPACING = 100kHz -55 HARMONIC DISTORTION (dBc) -50 OUTPUT BALANCE ERROR vs. FREQUENCY INTERMODULATION DISTORTION vs. FREQUENCY (MAX9628, VCC = 3.3V) MAX9626 toc52h INTERMODULATION DISTORTION vs. FREQUENCY (MAX9628, VCC = 5V) OUTPUT IMPEDANCE (I) MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers 50mV/div 5 VOCM 0 OUT_CM -5 50mV/div -10 0.01 1 10 100 1000 -15 1 500mV/div 1000 10,000 VOCM TRANSIENT RESPONSE (MAX9626, VIN = 1.15V TO 2.15V STEP) VOCM TRANSIENT RESPONSE (MAX9627, VIN = 1.6V TO 1.7V STEP) OUT_CM 2ns/div VOCM TRANSIENT RESPONSE (MAX9627, VIN = 1.15V TO 2.15V STEP) MAX9626 toc52o 50mV/div VOCM 50mV/div 2ns/div 12 100 FREQUENCY (MHz) MAX9626 toc52n 500mV/div 10 FREQUENCY (MHz) MAX9626 toc52p 500mV/div VOCM OUT_CM 500mV/div 2ns/div VOCM OUT_CM 2ns/div 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 1.7V STEP) MAX9626 toc52r MAX9626 toc52q MAX9626 toc53 INP 50mV/div 500mV/div VOCM 50mV/div VOCM OUT_DIFF 50mV/div OUT_CM 500mV/div OUT_CM 40mV/div 2ns/div 2ns/div 2ns/div SMALL-SIGNAL TRANSIENT RESPONSE (MAX9627, VIN = 0 TO 50mV STEP, VOCM = 1.65V) SMALL-SIGNAL TRANSIENT RESPONSE (MAX9628, VIN = 0 TO 25mV STEP, VOCM = 1.65V) LARGE-SIGNAL TRANSIENT RESPONSE (MAX9626, VIN = 0 TO 1V STEP, VOCM = 1.65V) MAX9626 toc56 MAX9626 toc55 MAX9626 toc54 INP INP INP 1V/div 20mV/div 20mV/div OUT_DIFF OUT_DIFF OUT_DIFF 400mV/div 40mV/div 40mV/div 2ns/div 2ns/div 2ns/div LARGE-SIGNAL TRANSIENT RESPONSE (MAX9627, VIN = 0 TO 500mV STEP, VOCM = 1.65V) LARGE-SIGNAL TRANSIENT RESPONSE (MAX9628, VIN = 0 TO 250mV STEP, VOCM = 1.65V) MAX9626 toc57 MAX9626 toc58 INP 200mV/div 200mV/div OUT_DIFF INP OUT_DIFF 400mV/div 400mV/div 2ns/div 2ns/div 13 MAX9626/MAX9627/MAX9628 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.)versions, unless noted otherwise.) MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers SHDN OUT+ TOP VIEW OUT- Pin Configuration 9 8 7 VEE 10 MAX9626 MAX9627 MAX9628 VEE 11 EP 1 IN+ 2 3 IN- + VOCM RT+ 12 6 VCC 5 VCC 4 RT- TQFN Pin Description 14 PIN NAME 1 IN+ FUNCTION 2 VOCM 3 IN- Inverting Differential Input Noninverting Differential Input Output Common-Mode Voltage Input 4 RT- Termination Resistor Terminal for IN- 5, 6 VCC Positive Supply Voltage 7 OUT+ Noninverting Differential Output 8 Active-Low Shutdown Mode Input 9 SHDN OUT- 10, 11 VEE Negative Supply Voltage 12 RT+ Termination Resistor Terminal for IN+ — EP Inverting Differential Output Exposed Pad. Connected to VEE. 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. The signal is applied differentially at the inputs and the output signal is obtained differentially at the outputs. The common-mode feedback loop controls the common-mode voltage at the outputs. Both inverting and noninverting outputs exhibit a common-mode voltage equal to the voltage applied at VOCM input, without affecting the differential output signal. The outputs are perfectly balanced having signals of equal amplitude and 180N apart in-phase. Amplifier input impedance is determined by internal gain resistors. Therefore, source impedance does affect the gain of the amplifier. Input termination resistors are required to achieve source impedance match. If preferred, the customer has the choice of using the on-chip termination resistors. If they are used, then the amplifier’s input impedance is 50I for singleended input configuration. The amplifier’s differential gain accuracy is directly affected by the source impedance value. The ICs feature a proprietary circuit design. The use of predistortion and dynamic distortion cancellation greatly improves large-signal AC-performance at high frequency. Fixed Gain Options for Best AC Performance The ICs have internal gain resistors to achieve excellent bandwidth and distortion performance. Because the virtual ground nodes among the gain resistors and the inputs of the amplifier are internal to the device, the parasitic capacitors of such nodes are kept to the minimum. This enhances the AC performance of the device. The ICs have three gain options with resistor values as per Table 1, while keeping the bandwidth constant. Table 1. Amplifier’s Gain Setting and Internal Resistor Values GAIN (V/V) RG (I) RF (I) 3dB BANDWIDTH (GHz) 1 200 200 1 2 150 300 1.35 4 125 500 1.15 The differential gain is given by the equation: G = RF/RG Internal Terminations Use the internal RT resistors in applications where the source impedance RS is 50I and the input impedance of the amplifier has to match with it. For a perfectly balanced circuit driven by a differential source impedance, the input impedance of the amplifier is given by the simple equation RIN = 2 x RG. For single-ended input applications, where the source impedance of 50I connects to either input, such as in the Typical Operating Circuit, the input impedance of the amplifier is given by the equation: RIN = RG RF 1 − 2 x (R + R ) G F To match the input impedance RS, the following condition must be met: RIN||RT = RS Therefore: RT = RS RS 0.5 x (R F + 2 x R G ) 1 − RG R G + RF From this equation it can be inferred that RT is about 64I for all the cases of Table 1. 15 MAX9626/MAX9627/MAX9628 Detailed Description 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. Applications Information Use the following equation to determine the input common-mode range: VIN_CM = (VAMP − VOUT_CM ) (G + 1) (G + 1) x G where VIN_CM is the input common-mode voltage. VAMP is the voltage at the input node of the internal amplifier. VOUT_CM is the output common-mode voltage. G is the gain of the device. VIN_CM LOW -2.0 -2.5 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 VOUT_CM (V) Figure 1. MAX9626 Input Common-Mode Voltage vs. Output Common-Mode Voltage of the Amplifier 2.0 GAIN = 2 1.5 1.0 VIN_CM HIGH 0.5 0 VIN_CM LOW -0.5 Input Voltage Range One of the typical applications is the translation of a single-ended input signal that is referenced to ground to a differential output signal that feeds a high-speed pipeline analog-to-digital converter (ADC) such as the one in the Typical Application Circuit. Because the input signal has 0V common mode, the majority of the amplifiers would require a negative supply. The ICs allow the input signal to be below ground even with single-supply operation (VEE connected to GND). How far below ground depends on the gain option. See the Electrical Characteristics table and Figures 1, 2, and 3 for details. 0 -0.5 -1.5 VIN_CM (V) RF x R T R T × (R S + R G ) + RS x R G VIN_CM HIGH 0.5 -1.0 The gain options with the internal termination resistors RT are given by the following equation and typical numbers are summarized in Table 2. Gain values are dependent on actual source impedance and on-chip RT, RG, and RF values. The latter are subject to process variation. GAIN = GAIN = 1 2.0 VIN_CM (V) RT (I) 2.5 -1.0 -1.5 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 VOUT_CM (V) Figure 2. MAX9627 Input Common-Mode Voltage vs. Output Common-Mode Voltage of the Amplifier 2.0 GAIN = 4 1.5 1.0 VIN_CM (V) MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers VIN_CM HIGH 0.5 VIN_CM LOW 0 -0.5 -1.0 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 VOUT_CM (V) Figure 3. MAX9628 Input Common-Mode Voltage vs. Output Common-Mode Voltage of the Amplifier 16 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. While many of these ADCs accept an input commonmode around half of their supply voltage, some of them have input common-mode range shifted toward either ground or the positive supply. The ICs can comfortably drive both 3.3V and 5V ADCs that have common-mode range around half supply. When powered with VCC of 5V or higher, the ICs can also drive some of the popular ADCs with common-mode range higher than 3V. The high bandwidth of VOCM makes the amplifier's output recover quickly from load transient conditions. Such conditions may occur when switching the ADC input capacitor during the track-and-hold phases. The input capacitor switching may cause a voltage glitch at the input of the ADC, which incurs a load transient condition for the driving amplifier. Power-Supply Decoupling and Layout Techniques The ICs are high-speed devices, sensitive to the PCB environment in which they operate. Realizing their superior performance requires attention to the details of highspeed PCB design. For power-supply decoupling with single-supply operation, place a large capacitor by the VCC supply node and then place a smaller capacitor as close as possible to the VCC pin. For 1GHz decoupling, 22pF to 100pF are good values to use. When used with split supplies, place relevant capacitors on the VEE supply as well. Ground vias are critical to provide a ground return path for high frequency signals and should be placed near the decoupling capacitors. Place ground vias on the exposed pad as well, along the edges and near the pins to shorten the return path and maximize isolation. Vias should also be placed next to the input and output signal traces to maximize isolation. Finally, make sure that the layer 2 ground plane is not severely broken up by signal vias or power supply vias. Signal routing should be short and direct to avoid parasitic effects. For very high-frequency designs, avoid using right angle connectors since they may introduce a capacitive discontinuity and ultimately limit the frequency response. Recommended Pipeline ADCs The MAX9626/MAX9627/MAX9628 family offers excellent bandwidth and distortion performance that is in line with the majority of high-speed and 16-bit resolution pipeline ADCs in the market. In particular, it is recommended in combination with the MAX19586/MAX19588 family of 16-bit and 100Msps pipeline ADCs. For lower resolution applications, the MAX9626/ MAX9627/MAX9628 family can also drive 10- to 14-bit ADCs such as the MAX12553/MAX12554/MAX12555, MAX12527/MAX12528/MAX12529 and MAX19505/ MAX19506/MAX19507 families. The first requirement is a solid continuous ground plane on the second PCB layer, preferably with no signal or power traces. PCB layers 3 and 4 can be power-supply routing or signal routing, but preferably they should not be routed together. 17 MAX9626/MAX9627/MAX9628 Input Voltage Noise The input referred voltage noise specification reported in the Electrical Characteristics table includes both the noise contribution of the amplifier and the contribution of all the internal resistive elements. Because such resistive elements change depending on the gain selection as per Table 1, the input voltage noise specification differs according to the gain options. 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. 12 TQFN T1233+1 21-0136 90-0066 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. MAX9626/MAX9627/MAX9628 Low-Noise, Low-Distortion, 1.35GHz Fully Differential Amplifiers 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. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 20 © 2011 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.