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PDF AD8138 Data sheet ( Hoja de datos )
| Número de pieza | AD8138 | |
| Descripción | Differential ADC Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
FEATURES
Easy to use, single-ended-to-differential conversion
Adjustable output common-mode voltage
Externally adjustable gain
Low harmonic distortion
−94 dBc SFDR at 5 MHz
−85 dBc SFDR at 20 MHz
−3 dB bandwidth of 320 MHz, G = +1
Fast settling to 0.01% of 16 ns
Slew rate 1150 V/µs
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 drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
GENERAL DESCRIPTION
The 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 the proprietary ADI 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 feedback circuit also minimizes any gain error that
would be associated with the mismatches in the external gain
setting resistors.
The differential output of the AD8138 helps balance the input
to differential ADCs, maximizing the performance of the ADC.
Low Distortion,
Differential ADC Driver
AD8138
PIN CONFIGURATION
–IN 1
VOCM 2
V+ 3
+OUT 4
AD8138
8 +IN
7 NC
6 V–
5 –OUT
NC = NO CONNECT
Figure 1.
TYPICAL APPLICATION CIRCUIT
5V
499Ω
VIN 499Ω +
VOCM
AD8138
499Ω
–
5V
AVDD DVDD
AIN
ADC
AIN
AVSS
VREF
DIGITAL
OUTPUTS
499Ω
Figure 2.
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 high bandwidth and IP3 of the
AD8138 also make it appropriate for use as a gain block in IF
and baseband signal chains. The AD8138 offset and dynamic
performance makes 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.
Rev. G
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1999–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8138
Data Sheet
VOCM TO ±OUT SPECIFICATIONS
At 25°C, VS = ±5 V, VOCM = 0, G = +1, RL, dm = 500 Ω, unless otherwise noted. Refer to Figure 39 for test setup and label descriptions. All
specifications refer to single-ended input and differential outputs, unless otherwise noted.
Table 2.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Slew Rate
INPUT VOLTAGE NOISE (RTI)
DC PERFORMANCE
Input Voltage Range
Input Resistance
Input Offset Voltage
Input Bias Current
VOCM CMRR
Gain
POWER SUPPLY
Operating Range
Quiescent Current
Power Supply Rejection Ratio
OPERATING TEMPERATURE RANGE
Conditions
f = 0.1 MHz to 100 MHz
VOS, cm = VOUT, cm; VDIN+ = VDIN– = VOCM = 0 V
∆VOUT, dm/∆VOCM; ∆VOCM = ±1 V
∆VOUT, cm/∆VOCM; ∆VOCM = ±1 V
TMIN to TMAX variation
∆VOUT, dm/∆VS; ∆VS = ±1 V
Min Typ
250
330
17
–3.5
0.9955
±3.8
200
±1
0.5
−75
1
±1.4
18 20
40
−90
−40
Max Unit
MHz
V/µs
nV/√Hz
+3.5
1.0045
V
kΩ
mV
µA
dB
V/V
±5.5 V
23 mA
µA/°C
−70 dB
+85 °C
Rev. G | Page 4 of 24
5 Page 
AD8138
–50
VOUT, dm = 2V p-p
RL = 800Ω
–60
–70
HD2 (VS = +5V)
–80
–90
HD2 (VS = ±5V)
–100
–110
–120
0
HD3 (VS = +5V)
HD3 (VS = ±5V)
10 20 30 40 50 60
FUNDAMENTAL FREQUENCY (MHz)
Figure 11. Harmonic Distortion vs. Frequency
70
–40
VOUT, dm = 4V p-p
RL = 800Ω
–50
HD3 (VS = +5V)
–60
–70
HD2 (VS = +5V)
–80
HD2 (VS = ±5V)
–90
–100
HD3 (VS = ±5V)
–110
0
10 20 30 40 50 60
FUNDAMENTAL FREQUENCY (MHz)
Figure 12. Harmonic Distortion vs. Frequency
70
–30
VOUT, dm = 2V p-p
RL = 800Ω
–40 FO = 20MHz
–50
–60
–70
HD2 (VS = +5V)
HD3 (VS = +5V)
–80
–90
–100
–4
HD3 (VS = ±5V)
HD2 (VS = ±5V)
–3 –2 –1
0
1
2
VOCM DC OUTPUT (V)
Figure 13. Harmonic Distortion vs. VOCM
3
4
Data Sheet
–60
VS = ±5V
RL = 800Ω
–70
HD3 (F = 20MHz)
HD2 (F = 20MHz)
–80
–90
–100
–110
HD2 (F = 5MHz)
HD3 (F = 5MHz)
–120
0
12345
DIFFERENTIAL OUTPUT VOLTAGE (V p-p)
6
Figure 14. Harmonic Distortion vs. Differential Output Voltage
–60
VS = 5V
RL = 800Ω
–70
–80
–90
–100
–110
HD2 (F = 20MHz)
HD3 (F = 20MHz)
HD2 (F = 5MHz)
HD3 (F = 5MHz)
–120
0
123
DIFFERENTIAL OUTPUT VOLTAGE (V p-p)
4
Figure 15. Harmonic Distortion vs. Differential Output Voltage
–60
VS = 3V
RL = 800Ω
–70
HD2 (F = 20MHz)
–80
HD3 (F = 20MHz)
–90
–100
HD3 (F = 5MHz)
HD2 (F = 5MHz)
–110
0.25
0.50 0.75 1.00 1.25 1.50
DIFFERENTIAL OUTPUT VOLTAGE (V p-p)
1.75
Figure 16. Harmonic Distortion vs. Differential Output Voltage
Rev. G | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AD8138.PDF ] | |
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