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AD8351 b
Datasheet
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Analog Devices AD8351 b Datasheet

Low Distortion
Differential RF/IF Amplifier
AD8351
FEATURES –3 dB Bandwidth of 2.2 GHz for A
= 12 dB
V
Single Resistor Programmable Gain
0 dB ≤ A
≤ 26 dB
V
Differential Interface Low Noise Input Stage 2.7 nV/√Hz @ A
= 10 dB
V
Low Harmonic Distortion –79 dBc Second @ 70 MHz –81 dBc Third @ 70 MHz OIP3 of 31 dBm @ 70 MHz Single-Supply Operation: 3 V to 5.5 V Low Power Dissipation: 28 mA @ 5 V Adjustable Output Common-Mode Voltage Fast Settling and Overdrive Recovery Slew Rate of 13,000 V/␮s Power-Down Capability 10-Lead MSOP Package
APPLICATIONS Differential ADC Drivers Single-Ended-to-Differential Conversion IF Sampling Receivers RF/IF Gain Blocks SAW Filter Interfacing

FUNCTIONAL BLOCK DIAGRAM

AD8351
PWUP
RGP1
INHI
INLO
RGP2
0
AD8351 WITH 10 dB OF
–10
GAIN DRIVING THE AD6645 (RL = 1k⍀)
–20
ANALOG INPUT: 70MHz ENCODE : 80MHz
–30
SNR : 69.1dB FUND : –1.1dBFS
–40
HD2 : –78.5dBc HD3 : –80.7dBc
–50
THD : –75.9dBc SFDR : 78.2dBc
–60
–70
–80
–90
–100
–110
–120
–130
051015 20 25 30 35
+
BIAS CELL
INHI
RG
200⍀
INLO
AD8351
AD8351
100nF
100nF
VOCM
VPOS
OPHI
OPLO
COMM
25⍀
25⍀
2
AD6645
14-BIT ADC
3

GENERAL DESCRIPTION

The AD8351 is a low cost differential amplifier useful in RF and IF applications up to 2.2 GHz. The voltage gain can be set from unity to 26 dB using a single external gain resistor. The AD8351 provides a nominal 150 Ω differential output impedance. The excellent distortion performance and low noise characteristics of this device allow for a wide range of applications.
The AD8351 is designed to satisfy the demanding performance requirements of communications transceiver applications. The device can be used as a general-purpose gain block, an ADC driver,
REV. B
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. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
and a high speed data interface driver, among other functions. The AD8351 can also be used as a single-ended-to-differential amplifier with similar distortion products as in the differential configuration. The exceptionally good distortion performance makes the AD8351 an ideal solution for 12-bit and 14-bit IF sampling receiver designs.
Fabricated in ADI’s high speed XFCB process, the AD8351 has high bandwidth that provides high frequency performance and low distortion. The quiescent current of the AD8351 is 28 mA typically. The AD8351 amplifier comes in a compact 10-lead MSOP package and will operate over the temperature range of –40°C to +85°C.
(VS = 5 V, RL = 150 , RG = 110 (AV = 10 dB), f = 70 MHz, T = 25C, parameters
AD8351–SPECIFICATIONS
specified differentially, unless otherwise noted .)
Parameter Conditions Min Typ Max Unit
DYNAMIC PERFORMANCE
–3 dB Bandwidth GAIN = 6 dB, V
GAIN = 12 dB, V GAIN = 18 dB, V
Bandwidth for 0.1 dB Flatness 0 dB ≤ GAIN ≤ 20 dB, V Bandwidth for 0.2 dB Flatness 0 dB ≤ GAIN ≤ 20 dB, V Gain Accuracy Using 1% Resistor for R Gain Supply Sensitivity V
± 5% 0.08 dB/V
S
≤ 1.0 V p-p 3,000 MHz
OUT
≤ 1.0 V p-p 2,200 MHz
OUT
≤ 1.0 V p-p 600 MHz
OUT
≤ 1.0 V p-p 200 MHz
OUT
≤ 1.0 V p-p 400 MHz
OUT
, 0 dB ≤ AV ≤ 20 dB ± 1dB
G
Gain Temperature Sensitivity –40°C to +85°C 3.9 mdB/°C Slew Rate R
= 1 kΩ, V
L
R
= 150 Ω, VS = 2 V Step 7,500 V/␮s
L
= 2 V Step 13,000 V/␮s
OUT
Settling Time 1 V Step to 1% <3 ns Overdrive Recovery Time V
= 4 V to 0 V Step, V
IN
≤ ± 10 mV <2 ns
OUT
Reverse Isolation (S12) –67 dB
INPUT/OUTPUT CHARACTERISTICS
Input Common-Mode
Voltage Adjustment Range 1.2 to 3.8 V
Max Output Voltage Swing 1 dB Compressed 4.75 V p-p Output Common-Mode Offset 40 mV
Output Common-Mode Drift –40°C to +85°C 0.24 mV/°C Output Differential Offset Voltage
20 mV
Output Differential Offset Drift –40°C to +85°C 0.13 mV/°C Input Bias Current ±15 ␮A Input Resistance Input Capacitance
1
1
5kΩ
0.8 pF CMRR 43 dB Output Resistance Output Capacitance
1
1
150 Ω
0.8 pF
POWER INTERFACE
Supply Voltage 3 5.5 V PWUP Threshold 1.3 V PWUP Input Bias Current PWUP at 5 V 100 ␮A
PWUP at 0 V 25 ␮A
Quiescent Current 28 32 mA
REV. B–2–
AD8351
Parameter Conditions Min Typ Max Unit
NOISE/DISTORTION
10 MHz
Second/Third Harmonic
Distortion
Third-Order IMD R
Output Third-Order Intercept f1 = 9.5 MHz, f2 = 10.5 MHz 33 dBm Noise Spectral Density (RTI) 2.65 nV/√Hz 1 dB Compression Point 13.5 dBm
70 MHz
Second/Third Harmonic
Distortion
Third-Order IMD R
Output Third-Order Intercept f1 = 69.5 MHz, f2 = 70.5 MHz 31 dBm Noise Spectral Density (RTI) 2.70 nV/√Hz 1 dB Compression Point 13.3 dBm
140 MHz
Second/Third Harmonic
Distortion
Third-Order IMD R
Output Third-Order Intercept f1 = 139.5 MHz, f2 = 140.5 MHz 29 dBm Noise Spectral Density (RTI) 2.75 nV/√Hz 1 dB Compression Point 13 dBm
240 MHz
Second/Third Harmonic
Distortion
Third-Order IMD R
Output Third-Order Intercept f1 = 239.5 MHz, f2 = 240.5 MHz 27 dBm Noise Spectral Density (RTI) 2.90 nV/√Hz 1 dB Compression Point 13 dBm
NOTES
1
Values are specified differentially.
2
See Applications section for single-ended-to-differential performance.
Specifications subject to change without notice.
2
2
2
2
RL = 1 kΩ, V R
= 150 Ω, V
L
= 1 kΩ, f1 = 9.5 MHz, f2 = 10.5 MHz,
L
V
= 2 V p-p Composite –90 dBc
OUT
R
= 150 Ω, f1 = 9.5 MHz, f2 = 10.5 MHz,
L
V
= 2 V p-p Composite –70 dBc
OUT
RL = 1 kΩ, V R
= 150 Ω, V
L
= 1 kΩ, f1 = 69.5 MHz, f2 = 70.5 MHz,
L
V
= 2 V p-p Composite –85 dBc
OUT
R
= 150 Ω, f1 = 69.5 MHz, f2 = 70.5 MHz,
L
V
= 2 V p-p Composite –69 dBc
OUT
RL = 1 kΩ, V R
= 150 Ω, V
L
= 1 kΩ, f1 = 139.5 MHz, f2 = 140.5 MHz,
L
= 2 V p-p Composite –79 dBc
V
OUT
R
= 150 Ω, f1 = 139.5 MHz, f2 = 140.5 MHz,
L
= 2 V p-p Composite –67 dBc
V
OUT
RL = 1 kΩ, V R
= 150 Ω, V
L
= 1 kΩ, f1 = 239.5 MHz, f2 = 240.5 MHz,
L
= 2 V p-p Composite –76 dBc
V
OUT
= 2 V p-p –95/–93 dBc
OUT
= 2 V p-p –86/–71 dBc
OUT
= 2 V p-p –79/–81 dBc
OUT
= 2 V p-p –65/–66 dBc
OUT
= 2 V p-p –69/–69 dBc
OUT
= 2 V p-p –54/–53 dBc
OUT
= 2 V p-p –60/–66 dBc
OUT
= 2 V p-p –46/–50 dBc
OUT
RL = 150 Ω, f1 = 239.5 MHz, f2 = 240.5 MHz, V
= 2 V p-p Composite –62 dBc
OUT
REV. B
–3–
AD8351

ABSOLUTE MAXIMUM RATINGS*

PIN CONFIGURATION

Supply Voltage VPOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 V
PWUP Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VPOS
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . 320 mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125°C/W
␪
JA
Maximum Junction Temperature . . . . . . . . . . . . . . . . . 125°C
Operating Temperature Range . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C
PWUP
RGP1
INHI
INLO
RGP2
1
2
AD8351
3
TOP VIEW
(Not to Scale)
4
5
10
9
8
7
6
VOCM
VPOS
OPHI
OPLO
COMM
Lead Temperature Range (Soldering 60 sec) . . . . . . . . . 300°C
*Stresses 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 indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ORDERING GUIDE

Model Temp. Range Package Description Package Option Branding
AD8351ARM –40°C to +85°C 10-Lead MSOP, 7" Tape and Reel RM-10 JDA AD8351ARM-R2 –40°C to +85°C 10-Lead MSOP, 7" Tape and Reel RM-10 JDA AD8351ARM-REEL7 –40°C to +85°C 10-Lead MSOP, 7" Tape and Reel RM-10 JDA AD8351-EVAL Evaluation Board

PIN FUNCTION DESCRIPTIONS

Pin No. Name Function
1PWUP Apply a positive voltage (1.3 V ≤ V
≤ VPOS ) to activate device.
PWUP
2 RGP1 Gain Resistor Input 1. 3 INHI Balanced Differential Input. Biased to midsupply, typically ac-coupled 4 INLO Balanced Differential Input. Biased to midsupply, typically ac-coupled. 5 RGP2 Gain Resistor Input 2. 6 COMM Device Common. Connect to low impedance ground. 7 OPLO Balanced Differential Output. Biased to VOCM, typically ac-coupled. 8 OPHI Balanced Differential Output. Biased to VOCM, typically ac-coupled. 9 VPOS Positive Supply Voltage. 3 V to 5.5 V. 10 VOCM Voltage applied to this pin sets the common-mode voltage at both the input and output.
Typically decoupled to ground with a 0.1 µF capacitor.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD8351 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.
–4–
REV. B
(VS = 5 V, T = 25ⴗC, unless otherwise noted.)
FREQUENCY (MHz)
30
1 10000
GAIN (dB)
5
10 100 1000
25
20
15
10
0
RG = 10⍀
RG = 50⍀
RG = 200⍀
20
15
10
RG = 20⍀
RG = 80⍀
Typical Performance Characteristics–
AD8351
GAIN (dB)
5
0
–5
1 10000
TPC 1. Gain vs. Frequency for a 150 Ω Differential Load
= 6 dB, 12 dB, and 18 dB)
(A
V
35
30
25
20
15
10
GAIN (dB)
5
0
–5
–10
10 10k
TPC 2. Gain vs. Gain Resistor, RG (f = 100 MHz,
= 150 Ω, 1 kΩ, and Open)
R
L
10.75
10.50
10.25
10.00
= 1k⍀) (dB)
L
9.75
GAIN (R
9.50
9.25
TPC 3. Gain vs. Temperature at 100 MHz (AV = 10 dB)
–30 50
–50 110
RG = 200⍀
10 100 1000
FREQUENCY (MHz)
RL = OPEN
R
= 150⍀
L
= 1k⍀
R
L
100 1k
RG (⍀)
–10 10 30 70 90
TEMPERATURE (ⴗC)
10.50
10.25
10.00
9.75
9.50
9.25
9.00
GAIN (RL = 150⍀) (dB)
TPC 4. Gain vs. Frequency for a 1 kΩ Differential Load
= 10 dB, 18 dB, and 26 dB)
(A
V
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
–0.1 –0.2 –0.3
GAIN FLATNESS (dB)
–0.4 –0.5 –0.6 –0.7 –0.8 –0.9 –1.0
RL = 150⍀
0
RL = 1k⍀
1 1000
10 100
FREQUENCY (MHz)
RL = 1k⍀
RL = 150⍀
TPC 5. Gain Flatness vs. Frequency (R
= 150 Ω and 1 kΩ, AV =10 dB)
L
0
–10
–20
–30
–40
–50
ISOLATION (dB)
–60
–70
–80
–90
0 1000
100 200 300 400 500 600 700 800 900
FREQUENCY (MHz)
TPC 6. Isolation vs. Frequency (AV = 10 dB)
REV. B
–5–
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