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AD8138ARM-AD8138ARM-REEL7
+/-5 V, Low distortion differential ADC driver
REV.E
Low Distortion
Differential ADC Driver
FEATURES
Easy to Use Single-Ended-to-Differential Conversion
Adjustable Output Common-Mode Voltage
Externally Adjustable Gain
Low Harmonic Distortion
–94 dBc—Second, –114 dBc—Third @ 5 MHz into
800� Load
–87 dBc—Second, –85 dBc—Third @ 20 MHz into
800� Load
–3 dB Bandwidth of 320 MHz, G = +1
Fast Settling to 0.01% of 16 ns
Slew Rate 1150 V/�s
Fast Overdrive Recovery of 4 ns
Low Input Voltage Noise of 5 nV/÷Hz
1 mV Typical Offset Voltage
Wide Supply Range +3 V to �5 V
Low Power 90 mW on 5 V
0.1 dB Gain Flatness to 40 MHz
Available in 8-Lead SOIC and MSOP Packages
APPLICATIONS
ADC Driver
Single-Ended-to-Differential Converter
IF and Baseband Gain Block
Differential Buffer
Line Driver
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
PRODUCT DESCRIPTIONThe AD8138 is a major advancement over op amps for differential
signal processing. The AD8138 can be used as a single-ended-
to-differential amplifier or as a differential-to-differential
amplifier. The AD8138 is as easy to use as an op amp, and
greatly simplifies differential signal amplification and driving.
Manufactured on ADI’s proprietary XFCB bipolar process, the
AD8138 has a –3 dB bandwidth of 320 MHz and delivers a
differential signal with the lowest harmonic distortion available
in a differential amplifier. The AD8138 has a unique internal
feedback feature that provides balanced output gain and phase
matching, suppressing even order harmonics. The internal feed-
back circuit also minimizes any gain error that would be associated
with the mismatches in the external gain setting resistors.
The AD8138’s differential output helps balance the input-to-
differential ADCs, maximizing the performance of the ADC.
The AD8138 eliminates the need for a transformer with high
performance ADCs, preserving the low frequency and dc infor-
mation. The common-mode level of the differential output is
adjustable by a voltage on the VOCM pin, easily level-shifting the
input signals for driving single-supply ADCs. Fast overload
recovery preserves sampling accuracy.
The AD8138 distortion performance makes it an ideal ADC driver
for communication systems, with distortion performance good
enough to drive state-of-the-art 10-bit to 16-bit converters at
high frequencies. The AD8138’s high bandwidth and IP3 also
make it appropriate for use as a gain block in IF and baseband
signal chains. The AD8138 offset and dynamic performance
make it well suited for a wide variety of signal processing and
data acquisition applications.
The AD8138 is available in both SOIC and MSOP packages for
operation over –40∞C to +85∞C temperatures.
AD8138–SPECIFICATIONS�DIN to �OUT Specifications
VOCM to �OUT Specifications
(@ 25�C, VS = �5 V, VOCM = 0, G = +1, RL,dm = 500 �, unless otherwise noted. Refer
to Figure 1 for test setup and label descriptions. All specifications refer to single-ended input and differential outputs unless otherwise noted.)
AD8138�DIN to �OUT Specifications
NOISE/HARMONIC PERFORMANCE*
OUTPUT CHARACTERISTICS
VOCM to �OUT SpecificationsDYNAMIC PERFORMANCE
DC PERFORMANCE
POWER SUPPLY
(@ 25�C, VS = 5 V, VOCM = 2.5 V, G = +1, RL,dm = 500 �, unless otherwise noted. Refer to Figure 1 for test
setup and label descriptions. All specifications refer to single-ended input and differential output, unless
otherwise noted.)SPECIFICATIONS
AD8138
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD8138 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5.5 V
VOCM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . 550 mW
�JA2 (SOIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155∞C/W
Operating Temperature Range . . . . . . . . . . . –40∞C to +85∞C
Storage Temperature Range . . . . . . . . . . . . –65∞C to +150∞C
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . . 300∞C
NOTESStresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational section
of this specification is not implied. Exposure to Absolute Maximum Ratings for
extended periods may affect device reliability.Thermal resistance measured on SEMI standard four-layer board.
Figure 1. Basic Test Circuit
PIN CONFIGURATION
ORDERING GUIDE
ModelAD8138AR
AD8138AR-REEL
AD8138AR-REEL7
AD8138ARM
AD8138ARM-REEL
AD8138ARM-REEL7
AD8138-EVAL
PIN FUNCTION DESCRIPTIONS
Pin No.2VOCM
3V+
6V–Negative Supply Voltage
7NC
TPC 1. Small Signal Frequency
Response
TPC 4. Large Signal Frequency
Response
TPC 7. Harmonic Distortion vs.
Frequency
TPC 2. Small Signal Frequency
Response
TPC 5. Large Signal Frequency
Response
TPC 8. Harmonic Distortion vs.
Frequency
TPC 3. 0.1 dB Flatness vs.
Frequency
TPC 6. Small Signal Frequency
Response for Various Gains
TPC 9. Harmonic Distortion vs.
VOCM
Unless otherwise noted, Gain = 1, RG = RF = RL,dm = 499 V, TA = 25�C; refer to Figure 1 for test setup.
AD8138TPC 10. Harmonic Distortion
vs. Differential Output Voltage
TPC 13. Harmonic Distortion
vs. RLOAD
TPC 16. Third Order Intercept vs.
Frequency
TPC 11. Harmonic Distortion
vs. Differential Output Voltage
TPC 14. Harmonic Distortion
vs. RLOAD
TPC 17. Large Signal Transient
Response
TPC 12. Harmonic Distortion
vs. Differential Output Voltage
FREQUENCY – MHz
OUT
– dBm–50
49.749.950.150.350.5TPC 15. Intermodulation Distortion
TPC 18. Small Signal Transient
Response
TPC 19. Large Signal Transient
Response
TPC 22. Output Overdrive
TPC 25. CMRR vs. Frequency
TPC 20. Large Signal Transient
Response
TPC 23. Test Circuit for Cap
Load Drive
TPC 26. Test Circuit for Output
Balance
TPC 21. Settling Time
TPC 24. Large Signal Transient
Response for Various Cap Loads
FREQUENCY – MHz
BALANCE ERROR – dB
11k10100
–70TPC 27. Output Balance Error
vs. Frequency
AD8138TPC 28. PSRR vs. Frequency
TPC 31. Input Bias Current
vs. Temperature
TPC 34. VOCM Transient Response
FREQUENCY – MHz
IMPEDANCE –
110100TPC 29. Output Impedance
vs. Frequency
TPC 32. Supply Current vs.
Temperature
TPC 35. Current Noise (RTI)
TPC 30. Output Referred
Differential Offset Voltage vs.
Temperature
TPC 33. VOCM Frequency Response
TPC 36. Voltage Noise (RTI)
