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
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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
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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.
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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
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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
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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
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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
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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
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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
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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
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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
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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
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