SC1894A-00C13

SC1894 General Description The SC1894 is the Scintera® 3rd generation of RF PA linearizers (RFPAL™) that provide improved correction and functionality over the previous generations. The SC1894 is a fully adaptive, RFin/RFout predistortion linearization solution optimized for a wide range of amplifiers, power levels, and communication protocols. The SC1894 uses the PA output and input signals to adaptively generate an optimized correction function in order to minimize the PA’s self-generated distortion and impairments. Using RF-domain analog signal processing enables the SC1894 to operate over wide-signal bandwidths and consume very low power. The SC1894 goes beyond linearization and provides accurate RF power measurement of RFIN and RFFB. Design support features including spectral monitoring and ACLR alarm are also available. These design support features are accessed through the SC1894’s serial peripheral interface (SPI) bus. Applications ●● Cellular Infrastructure (SC1894A-00C13) • Single/Multicarrier, Multistandard: CDMA/EVDO, TD-SCDMA, WiMAX®, WCDMA/HSDPA, LTE, and TD-LTE • BTS Amplifiers, RRH, Booster Amplifiers, Repeaters, Small Cells, Microcells, Picocells, DAS, AAS, and MIMO Systems ●● Microwave Backhaul (SC1894A-00M13) • BPSK, QPSK, Up to 1024-QAM • IF-to-RF Outdoor Unit (ODU) • Support for Adaptive Coding and Modulation (ACM) and Automatic Transmit Power Control (ATPC) Up to 100dB/s ●● Broadcast Infrastructure (SC1894A-00C13) • UHF Digital Broadcast • DVB-T/H/T2, CMMB, ISDB-T and ATSC • Other Applications: Digital Terrestrial UHF Amplifiers, Exciters, Drivers and Transmitters ●● Wide Range of PAs and Output Power • Amplifier: Class A/AB and Doherty • PA Process: LDMOS, GaN, GaAs, and InGaP • Average PA Output Power Examples: Cellular Infrastructure: Up to 49dBm Terrestrial Broadcast: Up to 60dBm ●● Any Application Requiring PA Linearization 19-6957; Rev 1; 7/20 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Features ●● RFin/RFout PA Linearizer SoC in Standard CMOS • Fully Adaptive Correction • Up to 28dB ACLR and 38dB IMD Improvement* ●● External Reference Clock Support: • 10, 13, 15.36, 19.2, 20, 26, and 30.72MHz ●● Low Power Consumption: • Duty-Cycled (9%) Feedback: 600mW • Full Adaptation: 1200mW ●● Frequency Range: 225MHz to 3800MHz ●● Input Signal Bandwidth: 1.2MHz to 75MHz ●● Packaged in 9mm x 9mm QFN Package ●● Operating Case Temperature: -40°C to +105°C ●● Fully RoHS Compliant, Green Materials ●● Dual-RF Power Measurement Benefits ●● Ease of Use • Integrated RFin/RFout Solution • Reduced FW Development ●● Reduces System Power Consumption and OPEX ●● Reduces BOM Costs, Area, and Total Volume • Smaller Power Supply, Heat Sink, and Enclosure • Eliminates Microcontroller and Power Detectors • Small Implementation Size (< 6.5cm2) ●● Field-Proven, Carrier Class Reliability Ordering Information and Application Block Diagram appears at end of data sheet. *Performance dependent on amplifier, bias, and waveform. SC1894 Detailed Description Introduction to Predistortion Using the SC1894 Wideband signals in today’s telecommunications systems have high peak-to-average ratios and stringent spectral regrowth specifications. These specifications place high linearity demands on power amplifiers. Linearity may be achieved by backing off output power at the price of reducing efficiency. However, this increases the component and operating costs of the power amplifier. Better linearity may be achieved through the use of digital predistortion and other linearization techniques, but many of these are time consuming and costly to implement. Wireless service providers are deploying networks with wider coverage, greater subscriber density, and higher data rates. These networks require more efficient power amplifiers. Additionally, the emergence of distributed architectures and active antenna systems is driving the need for smaller and more efficient power amplifier implementations. Further, there continues to be a strong push toward reducing the total capital and operating costs of base stations. With the SC1894, the complex signal processing is done in the RF domain. This results in a simple system-on-chip that offers wide signal bandwidth, broad frequency of operation, and very low power consumption. It is an elegant solution that reduces development costs and speeds time to market. Applicable across a broad range of signals — including 2G, 3G, 4G wireless, and other modulation types — the powerful analog signal-processing engine is capable of linearizing the most efficient power amplifier topologies. The SC1894 is a true RFin and RFout solution, supporting modular power amplifier designs that are independent of the baseband and transceiver subsystems. The SC1894 delivers the required efficiency and performance demanded by today’s wireless systems. RF Power Management Unit (PMU) Description Analysis The RFIN and RFFB log slope and intercept are derived using a linear regression performed on data collected under nominal operating conditions. The error from linear response to the CW waveform is the dB difference in output from the ideal output. This is a measure of the linearity of the device response to both CW and modulated waveforms. Error from the linear response to the CW waveform is a measure of relative accuracy because the system has yet to be calibrated. However, it verifies the linearity and the effect of modulation on the device response. Error www.maximintegrated.com 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) from the +25°C performance uses the performance of a given device and waveform type as the reference. This error is largely dominated by output variations associated with temperature. The PMU codes are represented as 16-bit signed integer and are converted to dBm (referenced to the balun input) using the following formula: For RFIN: P[Balun](dBm) = RFIN PMU (CODE) × 3.01 1024 + OFFSETRFIN(dBm) For RFFB: P[Balun](dBm) = RFFB PMU (CODE) × 3.01 1024 + OFFSETRFFB (dBm) The OFFSETRFIN and OFFSETRFFB are dependent on end-system characteristics and also on the part-to-part variation of the RFPAL. For absolute accuracy, the PMU calibration procedure outlined in the release notes and SPI programming guide must be followed. Measurement Considerations In order to provide sufficient integration samples to allow precise measurements of signals, the default integration time (measurement window) is fixed to 40ms. Note that if the measurement window is not a multiple of the system frame length, then the power-measurement window will span an incomplete frame and cause a measurement error. However; the synchronization of the frame and measurement window is not required to achieve precise measurements. TDD Considerations—Operation with < 100% PA Duty Cycle The PMU fully supports accurate measurement of TDD waveforms. The PMU does not differentiate between samples taken when the PA is on versus when the PA is off. Though easily compensated, this condition will affect the reading for waveforms with less than 100% duty cycle (e.g., TDD applications). For example, the PMU value read for a 50% duty-cycle waveform will be 3dB lower than the value for the same signal but with a 100% duty cycle. Calculating the offset associated with TDD measurements is straightforward and may be handled by the PMU depending on the system requirements. Refer to the Release Notes for additional details on different methods. Maxim Integrated │  2 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Application Block Diagram VDD ANTENNA NO DELAY TO 6NS INPUT COUPLER FEEDBACK COUPLER CORRECTION COUPLER DELAY RFIN CPLIN RFOUT SC1894 BALUN CIRCULATOR / FILTER / DUPLEXER PA CPLOUT RECEIVER RFINP RFOUTP RFINN RFOUTN BALUN EXT. CLOCK XTALI XTALO RFFBP OPTIONAL CRYSTAL 1.8V 3.3V DI/O RFFB BALUN RFFBN ATTENUATOR SPI REGULATOR OPTIONAL DIGITAL I/OS SUPPLY SERIAL INTERFACE Microwave Block Diagram ANTENNA CORRECTION COUPLER INPUT COUPLER RFIN RFOUT UP CONVERT FEEDBACK COUPLER DELAY (0 – 4NS) IF INPUT 225MHz–3.8GHz FILTER/DUPLEXER CPLOUT CPLIN RFPAL BALUN CRYSTAL OSCILLATOR LO RFINP RFOUTP RFINN RFOUTN XTALI RFFBP RFFBN XTALO 1.8V 3.3V PA SPI TO RECEIVER BALUN ATTENUATOR BALUN RFFB DOWN CONVERT REGULATOR SUPPLY www.maximintegrated.com SERIAL INTERFACE Maxim Integrated │  3 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Absolute Maximum Ratings Input into the BALUN (RMS).............................................+7dBm Junction Temperature.......................................................+150°C Storage Temperature......................................... -65°C to +150°C Supply Voltage (VDD33 to GND)..........................-0.3V to +3.8V Supply Voltage (VDD18 to GND)..........................-0.2V to +2.2V Input Voltage (1.8V pins)......................... -0.2V to VDD18 + 0.2V Input Voltage (3.3V pins)......................... -0.3V to VDD33 + 0.3V Operating Rating Operating Case Temperature……………………-40°C to +105°C Warning: Any stress beyond the ranges indicated may damage the device permanently. The specified stress ratings do not imply functional performance in these ranges. Exposure of the device to the absolute maximum ratings for extended periods of time is likely to degrade the reliability of this product. DC Characteristics PARAMETER MIN TYP MAX UNITS Supply Voltage (VDD33 to GND) 3.1 3.3 3.5 V Supply Voltage (VDD18 to GND) 1.7 Supply Peak Current (VDD33 to GND) (Notes 1, 2, 3, 4) 1.8 1.9 V 100 120 mA Supply Peak Current (VDD18 to GND) (Notes 1, 2, 3, 4) 840 900 mA Average Power Dissipation: Full-Scale Adaptation, Track and AF (Notes 2, 3, 4) 1200 1400 mW Average Power Dissipation: Duty-Cycled Feedback (Notes 2, 4, 5) 600 mW Note 1: Peak current includes supply decoupling network. Refer to Hardware Design Guide for proper sizing of the on-board regulators. Note 2: Characterized at typical voltages, +25°C operating case temperature, and 20MHz input signal BW. Note 3: Continuous adaptation, tracking (100% duty-cycled feedback). Note 4: Power dissipation may be FW dependent. Refer to the FW release notes for any changes to values listed above. Note 5: Duty-cycled feedback power dissipation averaged over ON time of 100ms (9%), OFF time of 1.0s (91%). Radio Frequency Signals Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified. PARAMETER Operating Frequency (Note 6) Input Signal Bandwidth (Note 7) SYMBOL CONDITIONS MIN TYP MAX UNITS f 225 3800 MHz BWsignal 1.2 75 (Note 8) MHz Noise Power (Note 9) Referred to 0dBm at PA input -140 -137 dBm/Hz In-Band CW Spurious Power (Notes 9, 10) PspurLF 698MHz–960MHz, at RFOUT balun single ended port -76 -69 dBm In-Band CW Spurious Power (Notes 9, 10) PspurMF 1800MHz–2200MHz, at RFOUT balun single ended port -69 -62 dBm In-Band CW Spurious Power (Notes 9, 10) PspurHF 2400MHz–2700MHz, at RFOUT balun single ended port -53 -41 dBm Note 6: See Operating Frequency Ranges table for frequency limits of each defined band. Note 7: In the case where 40MHz < BWsignal ≤ 75MHz and the carrier configuration is NON-fully occupied, then the average power delta between the two outermost carriers must be ≤ 20dB, the carrier configuration must be static (no hopping), the outermost carriers must be ≥ 5MHz and the fC must be stored in EEPROM. Note 8: Correction performance across range of input signal BWs also depends on PA output power and carrier configuration. Note 9: Worst case over supply voltage and temperature range, guaranteed by characterization. Note 10: Spurious content is typically due to RFPAL receiver LO leakage and is located within 1MHz of the occupied signal center frequency. www.maximintegrated.com Maxim Integrated │  4 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) RF Input Range for Maximum Correction—225MHz to 470MHz Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified. PARAMETER SYMBOL Peak RFIN_BLN (Notes 11, 13) PRFIN_BLN_P Peak RFFB_BLN (Notes 11, 13) PRFFB_BLN_P RMS RFIN_BLN (Notes 12, 13) PRFIN_BLN RMS RFFB_BLN (Notes 12, 13) PRFFB_BLN RFIN_BLN Operating Range PRFIN_BLN RFFB_BLN Operating Range PRFFB_BLN CONDITIONS When PA operates at maximum power RMS power, over PA output power range MIN TYP MAX UNITS -6 0 +2 dBm -16 -8 -6 dBm -13 -10 -8 dBm -23 -18 -16 dBm -48 -8 dBm -56 -16 dBm RF Input Range for Maximum Correction—470MHz to 700MHz Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified. PARAMETER SYMBOL Peak RFIN_BLN (Note 11, 13) PRFIN_BLN_P Peak RFFB_BLN (Note 11, 13) PRFFB_BLN_P RMS RFIN_BLN (Note 12, 13) PRFIN_BLN RMS RFFB_BLN (Note 12, 13) PRFFB_BLN RFIN_BLN Operating Range PRFIN_BLN RFFB_BLN Operating Range PRFFB_BLN CONDITIONS When PA operates at maximum power RMS power, over PA output power range MIN TYP MAX UNITS -6 0 +2 dBm -16 -8 -6 dBm -13 -10 -8 dBm -23 -18 -16 dBm -48 -8 dBm -56 -16 dBm RF Input Range for Maximum Correction—700MHz to 2700MHz Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Peak RFIN_BLN (Note 11, 13) PRFIN_BLN_P -2 +4 +6 dBm Peak RFFB_BLN (Note 11, 13) PRFFB_BLN_P -12 -4 -2 dBm RMS RFIN_BLN (Note 12, 13) PRFIN_BLN -9 -6 -4 dBm RMS RFFB_BLN (Note 12, 13) PRFFB_BLN -19 -14 -12 dBm RFIN_BLN Operating Range PRFIN_BLN -49 -4 dBm RFFB_BLN Operating Range PRFFB_BLN -52 -12 dBm When PA operates at maximum power RMS power, over PA output power range RF Input Range for Maximum Correction—2700MHz to 3300MHz Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified. PARAMETER SYMBOL Peak RFIN_BLN (Note 11, 13) PRFIN_BLN_P Peak RFFB_BLN (Note 11, 13) PRFFB_BLN_P RMS RFIN_BLN (Note 12, 13) PRFIN_BLN RMS RFFB_BLN (Note 12, 13) PRFFB_BLN RFIN_BLN Operating Range PRFIN_BLN RFFB_BLN Operating Range PRFFB_BLN www.maximintegrated.com CONDITIONS MIN When PA operates at maximum power RMS power, over PA output power range TYP MAX UNITS +6 dBm -4 dBm -4 dBm -14 dBm -44 -4 dBm -54 -14 dBm Maxim Integrated │  5 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) RF Input Range for Maximum Correction—3300MHz to 3800MHz Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, DVDD18 = 1.8V, and 20MHz external clock, unless otherwise specified. PARAMETER SYMBOL Peak RFIN_BLN (Note 11, 13) PRFIN_BLN_P Peak RFFB_BLN (Note 11, 13) PRFFB_BLN_P RMS RFIN_BLN (Note 12, 13) PRFIN_BLN RMS RFFB_BLN (Note 12, 13) PRFFB_BLN RFIN_BLN Operating Range PRFIN_BLN RFFB_BLN Operating Range PRFFB_BLN CONDITIONS When PA operates at maximum power RMS power, over PA output power range MIN TYP MAX UNITS +3 +9 +11 dBm -12 -4 -2 dBm -4 -1 +1 dBm -19 -14 -12 dBm -41 +1 dBm -52 -12 dBm Note 11: Peak power is defined as the 10-4 point on the CCDF (complementary cumulative distribution function) of the signal. Note 12: Power (MAX RMS) + PAR must not exceed the peak power limits specified above, there is no maximum limit on the PAR. Note 13: Referred to 50Ω impedance into a 1:2 balun. Operating Frequency Ranges FREQUENCY RANGE (Note 14) RECOMMENDED APPLICATIONS DESIGNATION 225MHz to 520MHz TV white space -02 225MHz to 960MHz UHF broadcast, TV White Space, public safety -03 520MHz to 1040MHz Low-band cellular (698MHz to 960MHz), UHF broadcast, TV white space, public safety -04 1040MHz to 2080MHz LTE for Japan (1400MHz to 1510MHz) -05 698MHz to 2700MHz Low- and high-band cellular, IF for SATCOMM (950MHz to 145MHz) -06 1800MHz to 2700MHz (DEFAULT) High-band cellular (1800MHz to 2700MHz) -07 2700MHz to 3500MHz 3300MHz to 3800MHz -08 Microwave (IF), WiMAX, LTE -09 Note 14: Default is -07. User may reprogram for other ranges listed above. Refer to SPI Programming Guide for programming information. Digital I/O—DC Characteristics Guaranteed performance across worst-case supply voltage and temperature range, unless otherwise specified. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS +0.8 V CMOS Input Logic-Low VIL   -0.3 CMOS Input Logic-High VIH VDD = 3.3V 2.0 CMOS Output Logic-Low VOL   CMOS Output Logic-High VOH VDD = 3.3V 2.4 SDO CMOS Output Current IOL/IOH Three-state -16.0 +16.0 mA STATO CMOS Output Current IOL/IOH Open drain -16.0 0.0 mA www.maximintegrated.com V 0.4 V V Maxim Integrated │  6 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Digital I/O—External Clock (XTALI) Guaranteed performance across worst-case supply voltage and temperature range, unless otherwise specified. PARAMETER User Programmable External Clock (Notes 15, 16) SYMBOL fCLK CONDITIONS   MIN TYP MAX UNITS 10 20 30.72 MHz 1 % External Clock Frequency Accuracy External Clock Frequency Drift Including aging and temperature 100 ppm Duty Cycle Square wave 45 55 % Sine or square wave 500 1500 mVp-p -130 dBc/Hz External Clock Amplitude External Clock Phase Noise VCLK PNCLK At 100kHz offset Note 15: Selecting an external reference clock frequency other than 20MHz requires programming the SC1894 through the SPI bus. See SPI Programming Guide and HW Design Guide for more information. Note 16: User may program the SC1894 to accept the following clock frequencies: 10, 13, 15.36, 19.2, 20, 26 and 30.72MHz. Crystal Requirements Guaranteed performance across worst-case supply voltage and temperature range, unless otherwise specified. PARAMETER SYMBOL CONDITIONS MIN TYP ESR Capacitive Load to Ground 10 Frequency Accuracy Frequency Drift Including aging and temperature MAX UNITS 50 Ω 12 pF 250 ppm 100 ppm MAX UNITS Serial Peripheral Interface (SPI) Bus Specifications Guaranteed performance across worst-case supply voltage and temperature range unless otherwise specified. PARAMETER Select Setup Time SYMBOL CONDITIONS MIN TYP tSS   100 ns Select Hold Time tSH   250 ns Select Disable Time tDIS   100 ns Data Setup Time tDS   25 ns Data Hold Time tDH   45 tR   Rise Time Fall Time ns 25 ns 25 ns tF   Clock Period tCP   250 ns Clock High Time tCH   100 ns Time to Output Valid tOV   100 ns Output Data Disable tOD   0 ns www.maximintegrated.com Maxim Integrated │  7 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Timing Diagram tDIS SSN tCP tSS tCH tR tF tSH SCLK tDS tDH SDI tOV tOD SDO IT IS REQUIRED THAT THE SPI BUS BE CONNECTED TO A HOST CONTROLLER IN ORDER TO READ OR WRITE CUSTOMER-ACCESSIBLE PARAMETERS. EEPROM Endurance PARAMETER SYMBOL EEPROM write/erase cycles CONDITIONS Page mode, +25°C MIN TYP MAX UNITS E/W Cycles 1M RF Power Measurement Electrical Characteristics RF Power Measurement Unit (PMU) Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, and DVDD18 = 1.8V, unless otherwise specified. Min/Max values are at -40°C < Tcase < +105°C, unless otherwise noted. PARAMETER Frequency Range (Note 19) RFIN_BLN Range (Note 20) RFFB_BLN Range (Note 20) SYMBOL CONDITIONS (Notes 17, 18) fCrange MIN TYP 698 PRFINRange RMS power, referred to 50Ω impedance into a 1:2 balun PRFFBRange RMS power, referred to 50Ω impedance into a 1:2 balun MAX UNITS 2500 MHz -4 dBm -12 dBm -44 (Note 21) -34 (Note 22) -52 (Note 21) -42 (Note 22) RFIN_BLN Log Slope µRFINslope Linear regression between -4 and -39dBm, 100 readings 341.3 LSB/dB RFFB_BLN Log Slope µRFFBslope Linear regression between -12 and -47dBm, 100 readings 341.3 LSB/dB RFIN_BLN Log Slope Variation σRFINslope Linear regression between -4 and -39dBm, 100 readings ±1.2 LSB/dB RFFB_BLN Log Slope Variation σRFFBslope Linear regression between -12 and -47dBm, 100 readings ±1.2 LSB/dB www.maximintegrated.com Maxim Integrated │  8 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) RF Power Measurement Electrical Characteristics (continued) RF Power Measurement Unit (PMU) (continued) Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, and DVDD18 = 1.8V, unless otherwise specified. Min/Max values are at -40°C < Tcase < +105°C, unless otherwise noted. PARAMETER SYMBOL CONDITIONS (Notes 23, 24) MIN TYP MAX UNITS RFIN_BLN Log Intercept µRFINIntercept Linear regression between -4 and -34dBm 0 dBm RFFB_BLN Log Intercept µRFFBIntercept Linear regression between -12 and -42dBm 0 dBm RFIN_BLN Log Intercept Variation σRFINIntercept Linear regression between -4 and -34dBm, 100 readings of single IC ±0.12 dB RFFB_BLN Log Intercept Variation σRFFBIntercept Linear regression between -12 and -42dBm, 100 readings of single IC ±0.12 dB RFIN_BLN Error as Referred to Best-Fit Line (Notes 25, 26) PRFIN_ FITERROR -4 to -34dBm -34 to -44dBm -0.30 -2 +0.30 +2 dB dB RFFB_BLN Error as Referred to Best-Fit Line (Notes 25, 26) PRFFB_ FITERROR -12 to -42dBm -42 to -52dBm -0.30 -2 +0.30 +2 dB dB RFIN_BLN, RFFB_BLN Deviation from 2-Tone CW Response (Note 27) 6.5 dB PAR (WCDMA 1 carrier) 10 dB PAR (WCDMA 1 carrier) 10 dB PAR (LTE 20 carrier) ±0.1 ±0.1 ±0.1 dB dB dB Deviation from output at 25°C, −40°C < Tcase < +105°C, RFIN_BLN Deviation vs. Temperature (Notes 25, 27) PRFINTEMP_ DEV -4 to -34dBm, at 1800MHz -34 to -44dBm, at 1800MHz -0.55 -2 ±0.1 ±0.5 +0.55 +2 dB dB -4 to -34dBm, at 2500MHz -34 to -44dBm, at 2500MHz -0.7 -2 ±0.1 ±0.5 +0.7 +2 dB dB -12 to -42dBm, at 1800MHz -42 to -52dBm, at 1800MHz -0.4 -2 ±0.1 ±0.5 +0.4 +2 dB dB -12 to -42dBm, at 2500MHz -42 to -52dBm, at 2500MHz -0.5 -2 ±0.1 ±0.5 +0.5 +2 dB dB Deviation from output at +25°C, −40°C < Tcase < +105°C, RFFB_BLN Deviation vs. Temperature (Notes 25, 27) RFIN_BLN Deviation vs. Supply Voltage PRFFBTEMP_ DEV PRFINVDD18 _DEV PRFINVDD33 1.7V < AVDD18 < 1.9V 3.1V < AVDD33 < 3.5V +0.7 -0.5 dB/V dB/V 1.7V < AVDD18 < 1.9V 3.1V < AVDD33 < 3.5V +0.7 -0.5 dB/V dB/V _DEV RFFB_BLN Deviation vs. Supply Voltage PRFFBVDD18 _DEV PRFFBVDD33 _DEV www.maximintegrated.com Maxim Integrated │  9 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) RF Power Measurement Electrical Characteristics (continued) RF Power Measurement Unit (PMU) (continued) Operation at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, and DVDD18 = 1.8V, unless otherwise specified. Min/Max values are at -40°C < Tcase < +105°C, unless otherwise noted. PARAMETER SYMBOL CONDITIONS (Notes 23, 24) MIN TYP MAX UNITS (RFIN_BLN) - (RFFB_BLN) Log Slope µRFIN-RFFBslope 0 LSB/dB (RFIN_BLN) - (RFFB_BLN) Log Slope Variation σRFINRFFBslope ±1.2 LSB/dB (RFIN_BLN) - (RFFB_BLN) Error as Referred to Best-Fit Line (Note 26) RFIN_BLN range (RFFN_BLN = RFIN_BLN – 7dB) -4 to -24dBm -24 to -34dBm (RFIN_BLN) - (RFFB_BLN) Deviation from 2-Tone CW Response (Note 27) 6.5dB PAR (WCDMA 1 carrier) 10dB PAR (WCDMA 1 carrier) 9.1dB PAR (WCDMA 12 carriers) (RFIN_BLN) - (RFFB_BLN) Deviation vs. Temperature (Note 27) Deviation from output at 25°C, −40°C < Tcase < +105°C, -4 to -24dBm, at 2200MHz -24 to -34dBm, at 2200MHz Note Note Note Note Note Note Note Note Note Note Note -0.30 -2 +0.30 +2 ±0.1 ±0.1 ±0.1 -0.55 -2 ±0.1 ±0.5 dB dB dB dB dB +0.55 +2 dB dB 17: Test conditions: 2-tone CW (3dB PAR), 5MHz bandwidth and centered at 2140 MHz unless otherwise specified. 18: Power measurement updated about every 340ms. The integration time (measurement window) fixed to 40ms. 19: For operation above 2500MHz, please contact factory. 20: RMS power (MAX) + peak to average ratio (PAR) must not exceed the peak power limits specified in the respective IC data sheets. As long as this condition is met, there is no limitation on the maximum PAR. 21: When RFIN_BLN and RFFB_BLN are measured sequentially or independently. 22: When RFIN_BLM and RFFB_BLN are measured simultaneously. 23: Test conditions: 2-tone CW (3dB PAR), 5MHz bandwidth and centered at 2140MHz unless otherwise specified. 24: Power measurement updated every 340ms. The integration time (measurement window) fixed to 40ms. 25: When RFIN_BLN and RFFB_BLN are measured sequentially or independently. 26: Guaranteed by test (at Tcase = +25°C) and characterization. 27: Guaranteed by characterization. www.maximintegrated.com Maxim Integrated │  10 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Typical Operating Characteristics Data presented in the figures on the following pages are based on typical operating conditions at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, and DVDD18 = 1.8V, unless otherwise specified. Measurements (PMU Error as Referred to Best-Fit Line) Figure 1. RFIN_BLN PMU Error as referred to best-fit line vs. RFIN RMS Power, frequency = 1800MHz Figure 2. RFFB_BLN PMU Error as referred to best-fit line vs. RFFB RMS Power, frequency = 1800MHz Figure 3. RFIN_BLN PMU Error as referred to best-fit line vs. RFIN RMS Power, frequency = 2500MHz Figure 4. RFFB_BLN PMU Error as referred to best-fit line vs. RFFB RMS Power, frequency = 2500MHz Conditions: Waveforms: WCDMA 2-carrier 6.5dB PAR and LTE 10MHz 7.5dB PAR −40°C < Tcase < +105°C A/DVDD18 = 1.7V/1.9V, AVDD33 = 3.1V/3.5V www.maximintegrated.com Maxim Integrated │  11 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Typical Operating Characteristics (continued) Data presented in the figures on the following pages are based on typical operating conditions at +25°C, AVDD18 = 1.8V, AVDD33 = 3.3V, and DVDD18 = 1.8V, unless otherwise specified. Measurements (PMU Deviation from +25°C) Figure 5. RFIN_BLN PMU deviation from +25°C vs. RFIN RMS Power, frequency = 1800MHz Figure 6. RFFB_BLN PMU deviation from +25°C vs. RFFB RMS Power, frequency = 1800MHz Figure 7. RFIN_BLN PMU deviation from +25°C vs. RFIN RMS Power, frequency = 2500MHz Figure 8. RFFB_BLN PMU deviation from +25°C vs. RFFB RMS Power, frequency = 2500MHz Conditions: Waveforms: WCDMA-2 carrier 6.5dB PAR and LTE 10MHz 7.5dB PAR −40°C < Tcase < +105°C A/DVDD18 = 1.7V/1.9V, AVDD33 = 3.1V/3.5V www.maximintegrated.com Maxim Integrated │  12 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) LOADENB DVDD18 DVDD33 STATO DGPIN1 DVDD18 SDO SDI SSN SCLK WDTENB RESETN MGPOUT0 TESTSEL1 1 TESTSEL2 DVDD18 DGPIN0 TOP VIEW DVDD18 Pin Configuration 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 DVDD18 2 47 AVDD18 MGPOUT1 3 46 XTALO AVDD18 4 45 XTALI AVDD33 5 44 FLTCAP3N GND 6 43 FLTCAP3P GND 7 42 AVDD18 RFOUTP 8 41 AVDD18 RFOUTN 9 40 FLTCAP2N SC1894 GND 10 39 FLTCAP2P AVDD18 11 38 FLTCAP1N AVDD18 12 37 FLTCAP1P MGPOUT2 13 36 AVDD18 MGPOUT3 14 35 AVDD18 GND 15 34 FLTCAP0N BGRES 16 33 FLTCAP0P www.maximintegrated.com 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 AVDD33 GND RFINP RFINN GND AVDD18 AVDD33 ADCIN0P ADCIN0N ADCIN1P ADCIN1N AVDD33 GND RFFBP RFFBN GND 65 - GNDPAD Maxim Integrated │  13 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Pin Description PIN NAME TYPE 1 DVDD18 Supply +1.8V DC Supply Voltage for digital circuits. FUNCTION 2 MGPOUT0 Analog Out Do not connect. Reserved for internal use. Do not connect. Reserved for internal use. 3 MGPOUT1 Analog Out 4 AVDD18 Supply +1.8V DC Supply Voltage for analog circuits. 5 AVDD33 Supply +3.3V DC Supply Voltage for analog circuits. 6 GND Supply Ground. 7 GND RF Shield 8 RFOUTP 9 RFOUTN Analog Out Ground for shield of RF signal. RF Output Signal, differential output. See S-parameters for complex impedance values. 10 GND RF Shield 11 AVDD18 Supply Ground for shield of RF signal. +1.8V DC Supply Voltage for analog circuits. 12 AVDD18 Supply +1.8V DC Supply Voltage for analog circuits. 13 MGPOUT2 Analog Out Do not connect. Reserved for internal use. Do not connect. Reserved for internal use. 14 MGPOUT3 Analog Out 15 GND Supply 16 BGRES Analog In 17 AVDD33 Supply 18 GND RF Shield Ground for shield of RF signal. Ground. Bandgap Resistor. +3.3V DC Supply Voltage for analog circuits. 19 RFINP Analog In 20 RFINN Analog In RF Input Signal, differential input. See S-parameters for complex impedance values. 21 GND RF Shield Ground for shield of RF signal. 22 AVDD18 Supply +1.8V DC Supply Voltage for analog circuits. 23 AVDD33 Supply +3.3V DC Supply Voltage for analog circuits. 24 ADCIN0P Analog In Do not connect. Reserved for internal use. 25 ADCIN0N Analog In Do not connect. Reserved for internal use. 26 ADCIN1P Analog In Do not connect. Reserved for internal use. 27 ADCIN1N Analog In Do not connect. Reserved for internal use. 28 AVDD33 Supply 29 GND RF Shield Ground for shield of RF signal. +3.3V DC Supply Voltage for analog circuits. 30 RFFBP 31 RFFBN Analog In RF Feedback Signal, differential input. See S-parameters for complex impedance values. 32 GND RF Shield Ground for shield of RF signal. 33 FLTCAP0P 34 FLTCAP0N 35 AVDD18 Supply +1.8V DC Supply Voltage for analog circuits. 36 AVDD18 Supply +1.8V DC Supply Voltage for analog circuits. www.maximintegrated.com Analog Out Dedicated external filter capacitor #0. Maxim Integrated │  14 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Pin Description (continued) PIN NAME 37 FLTCAP1P 38 FLTCAP1N 39 FLTCAP2P 40 FLTCAP2N TYPE FUNCTION Analog Out Dedicated external filter capacitor #1. Analog Out Dedicated external filter capacitor #2. 41 AVDD18 Supply +1.8V DC Supply Voltage for analog circuits. 42 AVDD18 Supply +1.8V DC Supply Voltage for analog circuits. 43 FLTCAP3P 44 FLTCAP3N 45 XTALI Analog In Analog Out Dedicated external filter capacitor #3. Crystal Input. For standard internal clock, connect crystal or ceramic resonator from XTALI to XTALO. May alternatively be driven by an external clock. 46 XTALO Analog Out 47 AVDD18 Supply +1.8V DC Supply Voltage for analog circuits. Crystal Output. Excitation driver for crystal or ceramic resonator. 48 DVDD18 Supply +1.8V DC Supply Voltage for digital circuits. 49 RESETN Digital In Reset when "Low". Has internal pull-up to DVDD33. Digital In Watch Dog Timer Enable. WDTENB enabled when high. Has internal pull-up to DVDD33. See applications schematic for further details. 50 WDTENB 51 SCLK Digital In SPI clock. Has internal pull-down to GND. 52 SSN Digital In SPI slave select enabled "Low". Has internal pull-up to DVDD33. 53 SDI Digital In 54 SDO Digital Out 55 DVDD18 Supply 56 DGPIN1 Digital In 57 STATO Digital Out 58 DVDD33 Supply +3.3V DC Supply Voltage for digital circuits. 59 DVDD18 Supply +1.8V DC Supply Voltage for digital circuits. 60 LOADENB Digital In Load Enable. Required for FW upgrades. Has internal pull-down to GND. See applications schematic for further details. 61 TESTSEL1 Reserved Do not connect. Reserved for internal use. Has internal pull-down to GND. 62 TESTSEL2 Reserved Do not connect. Reserved for internal use. Has internal pull-down to GND. 63 DGPIN0 Digital In Digital General Purpose Input 0. Do not connect. Reserved for future use. Has internal pull-down to GND. See applications schematic for further details. 64 DVDD18 Supply +1.8V DC Supply Voltage for digital circuits. 65 GNDPAD Supply Common Ground for entire integrated circuit. Also provides path for thermal dissipation. www.maximintegrated.com SPI slave data input to RFPAL. Has internal pull-down to GND. SPI slave data output from RFPAL. Tri-state. DVDD33 logic. +1.8V DC Supply Voltage for digital circuits. Digital General Purpose Input 1. Has internal pull-up to DVDD33. See Firmware Release Notes for further details. General Purpose Status Output as defined in Firmware Release Notes. Open-drain output with internal pull-up to DVDD33. Maxim Integrated │  15 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Top Mark SCINTERA SC1894A-00 XXXXXXXXXX WWYYRRRR LINE SCINTERA SC1894A-13 XXXXXXXXXX WWYYRRRR TOP MARK DESCRIPTION 1 SCINTERA Company Name 2 SC1894 Product Part Number 2 A Product Revision 2 -00 -13 Product Configuration (PC): -00 = All features enabled -13 = All features enabled* 3 XXXXXXXXXX Assembly Lot Number (up to 10 characters) 4 WW Date Code - Work Week 4 YY Date Code - Year 4 RRRR Reserved *Recommended for new designs. ESD ESD (Electrostatic discharge) sensitive device. Although this product incorporates ESD protection circuitry, permanent damage may occur on devices subjected to electrostatic discharges. Proper ESD precautions are recommended to avoid performance degradation or device failure. Electrostatic Discharge (ESD) Protection Characteristics TEST METHODOLOGY Human Body Model (per JESD22-A114) Charge Device Model (per JESD22-C101) www.maximintegrated.com CLASS VOLTAGE UNIT 1C 1000 V II 250 V Maxim Integrated │  16 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Package Information Ordering Information PART NUMBER DESCRIPTION SC1894A-00B00 IC, RFPAL, 225MHz–3800MHz, FW4.1.05.01 SC1894A-00B13 IC, RFPAL, 225MHz–3800MHz, FW4.1.05.01 SC1894A-00C13* IC, RFPAL, 225MHz–3800MHz, FW4.1.03.08 (for all other applications) SC1894A-00M13* IC, RFPAL, 225MHz–3800MHz, FW4.1.07.00 (for microwave applications) SC1894A-00N13* IC, RFPAL, 225MHz–3800MHz, FW4.5.01.00 (for narrow band applications) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 64 QFN K6499MK+1B 21-0765 90-0605 *Recommended for new designs. Shipping Designator: E = 7in tape and reel Append shipping designator (E) at end of part number. If left blank, designates bulk shipping option. Evaluation Kit Ordering Information PART NUMBER DESCRIPTION SC1894-EVK200 Eval Kit, RFPAL, 225-470MHz SC1894-EVK500 Eval Kit, RFPAL, 470-928MHz SC1894-EVK900 Eval Kit, RFPAL, 698-960MHz SC1894-EVK1500 Eval Kit, RFPAL, 1350-1800MHz SC1894-EVK1900 Eval Kit, RFPAL, 1800-2200MHz SC1894-EVK2400 Eval Kit, RFPAL, 2300-2700MHz SC1894-EVK3400 Eval Kit, RFPAL, 3300-3800MHz SC-USB-SPI* Adapter, SPI-USB Interface/Controller *To be ordered separately from the evaluation kit. www.maximintegrated.com Maxim Integrated │  17 SC1894 225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL) Revision History REVISION NUMBER REVISION DATE 0.2 9/14 PAGES CHANGED DESCRIPTION Initial release — 0.3 12/14 Added part number for microwave applications 0.4 12/14 Added microwave block diagram 1, 4 3 1 7/20 Added part number SC1894A-00N13* to Ordering Information table 17 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated 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. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2020 Maxim Integrated Products, Inc. │  18