Ultra-Small, Ultra-Thin, 4-Bump Op Amp

Transcription

1 EVALUATION KIT AVAILABLE MAX4428 General Description The MAX4428 is the industry s first op amp in a 4-bump WLP package, designed for use in portable consumer and medical applications. This device is offered as a noninverting amplifier with gain (A V ) of +V/V, +2V/V, or +V/V. The device features rail-to-rail output, low µv input voltage offset, and 5MHz of bandwidth with only 7µA of supply current. The device features shutdown functionality by pulling to ground. During shutdown, both the input and the output are high impedance. The device is available in an ultra-small,.86mm x.86mm, 4-bump WLP package with.5mm height. It is specified over the -4 C to +25 C temperature range. Applications Benefits and Features S.86mm x.86mm 4-Bump Thin WLP Package S Low µv Input Offset Voltage S Rail-to-Rail Output S 5MHz GBW with Only 7µA Supply Current S Shutdown Input Through S Ultra-Low pa Input Bias Current S.8V to 5.5V Wide Supply Range S Three Gain Versions Available V/V () 2V/V (MAX4428V) V/V (MAX4428U) Ordering Information appears at end of data sheet. 3G/4G Handsets Sensor Interfaces Portable Medical Devices Battery-Powered Devices General-Purpose Signal Processing Notebooks Transimpedance Amplifiers For related parts and recommended products to use with this part, refer to Functional Diagrams IN IN MAX4428V IN MAX4428U R 9R R R For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit s website at ; Rev ; /3

2 ABSOLUTE MAXIMUM RATINGS VDD to...-.3v to +6V IN to...-.3v to +6V to... (V -.3V) to (VDD +.3V) Continuous Power Dissipation (TA = +7NC) WLP (derate 9.7mW/NC above +7NC)...33mW Maximum Continuous Current into Any Pin...P 2mA Operating Temperature Range... -4NC to +25NC Storage Temperature Range NC to +5NC Soldering Temperature (reflow)...+26nc 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. PACKAGE THERMAL CHARACTERISTICS (Note ) WLP Junction-to-Ambient Thermal Resistance (q JA )...3 C/W Note : Package thermal resistances were obtained using the method described in JEDEC specification JESD5-7, using a four-layer board. For detailed information on package thermal considerations, refer to ELECTRICAL CHARACTERISTICS ( = 3.3V, V = V, R L = ki to /2, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25NC.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC PERFORMANCE (Note ) Input Voltage Range (Note 3) Gain Error V IN GE Input Offset Voltage (Note 2) V OS V IN = 5mV, no load A V = V/V (). A V = 2V/V (MAX4428V).5 A V = V/V (MAX4428U). -. ( -.)/2 ( -.)/ A V = V/V ()..2 A V = 2V/V (MAX4428V).2.6 A V = V/V (MAX4428U).3.7 A V = 2 A V = 2V/V 2 A V = V/V 2 Input Offset Voltage Drift (Note 2) V OS - TC 2 9 FV/NC T A = +25NC (Note 2) Input Bias Current (Note 2) I B T A = -4NC to +25NC 2 Output Short-Circuit Current I SC to or 5 ma R = ki.2 Output Voltage Low V OL R = 6I. V % FV pa V 2

3 ELECTRICAL CHARACTERISTICS (continued) ( = 3.3V, V = V, R L = ki to /2, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25NC.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage High V OH R = ki R = 6I Input Voltage-Noise Density e n A V = 2V/V, f = khz 9 nv/ Hz A V = V/V, f = khz 5 A V = V/V, f = khz 6 Gain Bandwidth GBW 5 MHz Slew Rate SR 8 V/Fs Capacitive Load C LOAD No sustained oscillations pf POWER-SUPPLY CHARACTERISTICS Guaranteed by T A = -4NC to +25NC Power-Supply Range PSRR T A = NC to +7NC V Power-Supply Rejection Ratio PSRR 75 db Supply Current I CC V = /2, no load 7 2 FA Shutdown Supply Current I SHDN FA Shutdown Threshold V IL.5 V T A = +25NC 2 Turn-On Time t ON T A = -4NC to +25NC 3 ms Note : All devices are % production tested at T A = +25 C. Specifications over temperature limits are guaranteed by design. Note 2: Guaranteed by design. Note 3: Guaranteed by gain accuracy specifications... V 3

4 Typical Operating Characteristics (T A = +25 C, unless otherwise noted.) (db)/ (degrees) AND vs. FREQUENCY () MAX4428 toca (db)/ (degrees) AND vs. FREQUENCY () MAX4428V MAX4428 tocb (db)/ (degrees) AND vs. FREQUENCY () MAX4428U MAX4428 tocc -8-2., -2., -2., (db)/ (degrees) AND vs. FREQUENCY (C L = pf) MAX4428 toc2a (db)/ (degrees) AND vs. FREQUENCY (C L = pf) MAX4428V MAX4428 toc2b (db)/ (degrees) AND vs. FREQUENCY (C L = pf) MAX4428U MAX4428 toc2c , -2., -2., PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY MAX4428 toc3 PUT IMPEDANCE (I) PUT IMPEDANCE vs. FREQUENCY MAX4428 toc4 DENSITY (nv/ Hz) DENSITY vs. FREQUENCY V = /2 MAX4428 toc5-2.,..,.. 4

5 (T A = +25 C, unless otherwise noted.) Typical Operating Characteristics (continued) DENSITY (nv/ Hz) DENSITY vs. FREQUENCY MAX4428V V = /2 MAX4428 toc6 DENSITY (nv/ Hz) DENSITY vs. FREQUENCY MAX4428U V = /2 MAX4428 toc7 SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE V IN = /2 MAX4428 toc SUPPLY CURRENT (µa) SUPPLY CURRENT vs. SUPPLY VOLTAGE V IN = /2 MAX4428 toc9 ACCURACY (%) ACCURACY vs. INPUT VOLTAGE MAX4428 toc ACCURACY (%) ACCURACY vs. TEMPERATURE MAX4428 toc SUPPLY VOLTAGE (V) 2 INPUT VOLTAGE (V) INPUT OFFSET VOLTAGE (µv) V IN = 5mV INPUT OFFSET VOLTAGE vs. TEMPERATURE MAX4428 toc2 INPUT BIAS CURRENT (pa) INPUT BIAS CURRENT vs. INPUT VOLTAGE MAX4428 toc3 PUT VOLTAGE SWING HIGH (V) PUT VOLTAGE SWING HIGH vs. TEMPERATURE MAX4428 toc INPUT VOLTAGE (V)

6 (T A = +25 C, unless otherwise noted.) Typical Operating Characteristics PUT VOLTAGE SWING LOW (V) PUT VOLTAGE SWING LOW vs. TEMPERATURE 6 MAX4428 toc5 SUPPLY VOLTAGE (V) MINIMUM OPERATING VOLTAGE vs. TEMPERATURE 6 MAX4428 toc6 CAPACITIVE LOAD (pf) CAPACITIVE-LOAD STABILITY vs. RESISTIVE LOAD STABLE REGION UNSTABLE REGION k k k RESISTIVE LOAD (I) MAX4428 toc7 ISOLATION RESISTANCE vs. CAPACITIVE-LOAD STABILITY SMALL-SIGNAL STEP RESPONSE vs. TIME MAX4428 toc9 ISOLATION RESISTANCE (Ω) STABLE REGION UNSTABLE REGION MAX4428 toc8 INPUT 5mV/div V CC /2 PUT 5mV/div V CC / LOAD CAPACITANCE (pf) µs/div LARGE-SIGNAL STEP RESPONSE vs. TIME MAX4428 toc2 INPUT 5mV/div V CC /2 PUT 5mV/div V CC/2 OVERSHOOT (%) INPUT OFFSET VOLTAGE vs. TEMPERATURE V IN = mv P-P NEGATIVE OVERSHOOT POSITIVE OVERSHOOT MAX4428 toc2 µs/div C LOAD (pf) 6

7 Bump Configuration TOP VIEW (BUMPS ON BOTTOM) + MAX A IN B WLP Bump Description BUMP NAME FUNCTION A IN Input A2 Positive Supply Voltage B Ground B2 Output 7

8 Detailed Description Rail-to-Rail Output Stage The MAX4428 is a high-bandwidth, low-power op amp in the smallest 4-bump WLP industry package. Its combination of precision, low-noise, and low-power specifications makes it ideal for use in a wide variety of sensor interface applications in portable consumer and medical equipment. Shutdown Mode The MAX4428 features shutdown functionality by pulling to ground. During shutdown, both the input and the output are high-impedance. The input and output of the MAX4428 enter a high-impedance state when the device enters shutdown. Since shutdown is triggered by lowering the supply voltage to below.5v, the ESD protection diodes at the output limit the high-z voltage range of the output. Diode D2 in Figure 2, from the output of the amplifier to, is forward biased when the output voltage becomes too high in shutdown mode. The diodes combined with the low-voltage shutdown functionality effectively limit the high-impedance output range to plus and minus a diode voltage around ground (~P.6V). Driving Capacitive Loads Driving a capacitive load can cause instability in many op amps, especially those with low quiescent current. The MAX4428 is stable for a range of capacitive loads to above 4pF. Adding a series resistor between the output and the load capacitor improves the circuit s response by isolating the load capacitance from the op amp s output. See the Isolation Resistance vs. Capacitive-Load Stability graph in the Typical Operating Characteristics section for details. Applications Information The MAX4428 features low input voltage offset and low bias current, which makes the device ideal for singlesupply DC operations. However, its wide bandwidth and low noise make it suitable also for AC applications. The circuit in Figure enables AC-coupled applications with the simple addition of two external resistors R and R2. Such resistors set the output bias voltage at midsupply. The values of R and R2 depend on the gain option of the device, according to the equation: x (R2/(R + R2)) = /(2 x A V ) Driver for Interfacing with the MAX645 ADC The MAX4428 s tiny size and low noise make it a good fit for driving 2- to 6-bit resolution ADCs in space-constrained applications. The Typical Application Circuit shows the MAX4428 amplifier output connected to a lowpass filter driving the MAX645 ADC. The MAX645 is part of a family of 3V and 5V, 2-bit and -bit, 2-channel ADCs. The MAX645 offers sample rates up to 94ksps and measures two single-ended inputs or one differential input. These ADCs dissipate 67FA at the maximum sampling rate, but just 6FA at ksps and.5fa in shutdown. Offered in the ultra-tiny,.9mm x 2.2mm WLP and FMAX-8 packages, the MAX645 ADCs are an ideal fit to pair with the MAX4428 amplifier in por table applications. Where higher resolution is required, refer to the MAX69 (4-bit) and MAX69 (6-bit) ADC families. V IN R C R2 IN Figure. How to Use the MAX4428 in AC-Coupled Applications Figure 2. Output ESD Protection Diodes D2 MAX4428 D V 8

9 Typical Application Circuit 5nF +5V 2.4kI 22kI 33pF MAX4428 ki 3.3nF ADC MAX645 CORNER FREQUENCY = khz SALLEN-KEY FILTER WLP Applications Information For the latest application details on WLP construction, dimensions, tape carrier information, PCB techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability testing results, refer to Application Note 89: Wafer-Level Packaging (WLP) and Its Applications. Package Information For the latest package outline information and land patterns (footprints), go to 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. PACKAGE TYPE PACKAGE CODE LINE NO. 4 WLP N4A LAND PATTERN NO. Refer to Application Note 89 PART ANS+T MAX4428VANS+T MAX4428UANS+T Ordering Information TEMP RANGE -4NC to +25NC -4NC to +25NC -4NC to +25NC PIN- PACKAGE 4 WLP 4 WLP 4 WLP +Denotes a lead(pb)-free/rohs-compliant package. FUNCTION Noninverting, A V = V/V Noninverting, A V = 2V/V Noninverting, A V = V/V 9

10 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 2/2 Initial release /3 Revised the Typical Operating Characteristics and released the 5, 6, 9 cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a product. No circuit patent licenses are implied. reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 6 Rio Robles, San Jose, CA 9534 USA Products, Inc. and the logo are trademarks of Products, Inc.

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