TAT7457
75Ω pHEMT Adjustable Gain RF Amplifier
®
Product Overview
The TAT7457 is a low-cost RF amplifier designed for
applications from DC to 2000 MHz. The balance of low
noise and distortion provides an ideal solution for a wide
range of broadband amplifiers used in cable television
applications such as optical receivers and low noise front
ends.
The TAT7457 has features allowing a great deal of designin flexibility. Gain and return loss are adjustable with an
external feedback resistor. An internal bias circuit mitigates
the effect of temperature and process variation and an
external resistor may be used to adjust the bias current to
optimize distortion or noise performance. There are no onchip capacitors limiting the low frequency response which
extends down to DC.
SOT-89 Package
Key FeaturesSOT-89 Package
•
•
The TAT7457 is fabricated using 6-inch GaAs pHEMT
technology to optimize performance and cost. It provides
excellent gain and return loss consistency inherent to the
pHEMT process.
Backside Paddle - GND
1
2
GND
3
•
pHEMT device technology
•
•
•
•
Functional Block Diagram
RF IN
•
•
•
•
•
•
Gain, return loss and bias externally adjustable
On-chip active bias for consistent bias current and
repeatable performance
DC – 2000 MHz bandwidth
Low noise: typical NF < 2 dB to 1000 MHz
Flexible 5 V to 8 V biasing
IDD = 120 mA typical at VDD 5 V in application
circuit
19 dB typical gain in application circuit
+40 dBm typical OIP3
+61 dBm typical OIP2
+21 dBm typical P1dB
Low distortion: CSO -66 dBc, CTB -78 dBc
(10 dBmV / ch at input, 80 ch NTSC flat)
Applications
RF OUT / VDD
•
•
•
•
•
External feedback circuit for gain
and return loss adjustment.
Single-ended and Push-pull Optical Receivers
Low-noise Drop Amplifiers
Distribution Amplifiers
Multi-Dwelling Units
Single-ended Gain Block
Top View
Ordering Information
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
Part Number
Description
TAT7457
75Ω High Linearity pHEMT Amplifier
TAT7457EB
Assembled Evaluation Board
TAT7457TR
1000 pieces on a 7” reel
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TAT7457
®
75Ω pHEMT Adjustable Gain RF Amplifier
Absolute Maximum Ratings
Parameter
Storage Temperature Range
Rating
−65 to +150 °C
+10 V
Device Voltage
Exceeding any one or a combination of the Absolute Maximum Rating conditions may cause permanent damage to the device. Extended application of
Absolute Maximum Rating conditions to the device may reduce device reliability.
Recommended Operating Conditions
Parameter
VDD
Min
5
IDD
Tj for
Typ
Max
8
120
>106 hours
MTTF
Unit
V
mA
+150
°C
Electrical specifications are measured at specified test conditions. Specifications are not guaranteed over all recommended operating conditions.
Electrical Specifications
Parameter
Condition (1)
Min
Frequency Range
Typ
DC
Gain
Max
Unit
1200
MHz
19
dB
+/-0.7
dB
2.0
dB
Input Return Loss
18
dB
Output Return Loss
18
dB
Gain
19
dB
+/-0.7
dB
Gain Flatness
Noise Figure
50-1000 MHz
Gain Flatness
Noise Figure
50-1200 MHz
2.3
dB
Input Return Loss
14
dB
Output Return Loss
17
dB
Output P1dB
+21
dBm
f1=225 MHz, f2= 325 MHz
Pout=+5 dBm / tone
61
dBm
40
dBm
-66
dBc
CTB
10 dBmV / ch at input, flat loading, 80
channels NTSC+QAM up tp 1218 MHz
-78
dBc
Thermal Resistance, θjc
Junction to Case
38
°C/W
Output IP2
Output IP3
CSO
Notes:
1. Typical performance at these conditions: Temp = +25 °C, VDD = +5 V, 75 Ω system
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
®
75Ω pHEMT Adjustable Gain RF Amplifier
Evaluation Board Schematic; DC – 1200 MHz
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
®
75Ω pHEMT Adjustable Gain RF Amplifier
Evaluation Board Bill of Materials; DC – 1200 MHz
Ref Designator
Description
PCB, TAT7547
Manufacturer
Qorvo
Part Number
PCB
U1
Amplifier, SOT-89
Qorvo
TAT7457
R1
RES, 1 kΩ, 1%, 1/10W, 0402
Panasonic
ERJ-2RKF1001X
R2
RES, 0 Ω, 1/4W, 1206
Kamaya
RMC1/8JPTP
R3
DNP
N/A
N/A
R4
RES, 0 Ω, 0402
Kamaya
RMC1/16SJPTH
R5
RES, 37.4 kΩ, 1%, 1/10W, 0402
Panasonic
ERJ-2RKF3742X
C1, C2
CAP, 0.01 uF, 10%, X7R, 16V, 0603
Murata
GRM188R71H103KA01D
C3, C4
CAP, 0.01 uF, 10%, X7R, 25V, 0402
Murata
GRM155R71E103JA01D
C5, C6
CAP, 0.1 uF, 10%, X7R, 16V, 0603
Murata
GRM188R71C104KA010
L1, L2
IND, 4.7 nH, 5%, W/W, 0402
Coilcraft
0402CS-4N7XJLW
L3
IND, 880 nH, +/-5%, 1206
Murata
LQH31HNR88J03
L4
IND, 0.9 uH, 10%, 1.3A, W/W, 1008
Coilcraft
1008AF-901XZKL
J1
CONN, HDR, RT ANG, 2 PIN, 0.100", T/H Molex
022-28-8021
J2, J3
CONN. 75 OHM, EDGE LAUNCH F
LTI-FSF55NT-P
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
Lighthorse Technology
- 4 of 16 -
TAT 50-0052
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TAT7457
®
75Ω pHEMT Adjustable Gain RF Amplifier
Evaluation Board PCB Stack Up and Material
1 oz. Cu top layer
0.062 ± 0.006
Finished Board
Thickness
FR4
1 oz. Cu bottom layer
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
75Ω pHEMT Adjustable Gain RF Amplifier
®
Performance Data at VDD = 5 V (DC – 1200 MHz)
Gain
25
24
22
+85°C
+25°C
- 40°C
-5
+85°C
+25°C
−40°C
23
-10
21
S11 (dB)
S21 (dB)
Input Return Loss
0
20
19
18
-15
-20
-25
-30
17
-35
16
15
-40
0
325
650
975
1300
0
325
Freq (MHz)
CSO & CTB
-50
CSO +85°C
CSO −40°C
-70
-80
80 ch NTSC + QAM (at 6dB
offset) upto 1218 MHz, flat
loading, Pin = 10 dBmV/ch.
CTB +25°C
CTB −40°C
-100
100
-15
-20
-25
-30
CTB +85°C
0
1300
+85°C
+25°C
-40°C
-10
S22 (dB)
CSO & CTB (dBc)
-5
CSO +25°C
-90
975
Output Return Loss
0
-60
650
Freq (MHz)
200
300
400
500
-35
-40
600
0
Frequency (MHz)
325
650
975
1300
Freq (MHz)
Noise Figure
4.0
3.2
NF (dB)
2.4
+85°C
+25°C
1.6
−40°C
0.8
0.0
0
325
650
975
1300
Freq (MHz)
Notes:
(1) VDD = +5 V, IDD = 120 mA
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
75Ω pHEMT Adjustable Gain RF Amplifier
®
Performance Data at VDD = 8 V (DC – 1200 MHz)
Gain
25
Input Return Loss
0
+850 C
+250 C
-400 C
24
23
-10
S11 (dB)
22
S21 (dB)
+250 C
+850 C
-400 C
-5
21
20
19
18
-15
-20
-25
-30
17
-35
16
15
-40
0
325
650
Freq (MHz)
975
1300
0
325
CSO & CTB
-60
-75
-80
-85
CTB +850 C
CTB +250 C
CTB -400 C
-90
-95
+250 C
+850 C
-10
CSO +850 C
CSO +250 C
CSO -400 C
S22 (dB)
CSO & CTB (dBc)
-400 C
-5
-70
1300
0
-55
-65
975
Output Return Loss
80 ch NTSC @ +10 dBmV/ch FLAT Input
-50
650
Freq (MHz)
-15
-20
-25
-30
-35
-100
-40
0
100
200
300
400
Freq (MHz)
500
600
0
325
650
Freq (MHz)
975
1300
Noise Figure
6
+850 C
+250 C
-400 C
5
NF (dB)
4
3
2
1
0
0
325
650
Freq (MHz)
975
1300
Notes:
(1) VDD = +8 V, IDD = 140 mA
(2) IDD adjusted with an external supply, similar to adjusting R3 and R5.
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
®
75Ω pHEMT Adjustable Gain RF Amplifier
Typical Application Schematic; 2 GHz Satellite
Evaluation Board Bill of Materials for 2.0 GHz Satellite
Ref Designator
Description
TAT7547
Manufacturer
Qorvo
Part Number
PCB
U1
Amplifier, SOT-89
Qorvo
TAT7457
R1
RES, 750 Ω, 1%, 0402
Panasonic
ERJ-2RKF7500X
R5
RES, 75 kΩ, 5%, 0402
Panasonic
ERJ-2GEJ753X
C1, C2
CAP, 0.01 uF, 10%, X7R, 16V, 0603
Murata
GRM188R71H103KA010D
C3
CAP, 560 pF, 10%, X7R, 16V, 0402
Murata
GCM155C1H561J16D
C4
CAP, 0.01 uF, 10%, X7R, 25V, 0402
Murata
GRM155R71E103JA01D
CIN
CAP, 0.5 pF +/-0.1 pF, 50V, C0G, 0603
Murata
GRM1885C1HR50BA01D
L1
IND, 2.7 nH, 5%, 0402
Murata
LQG15HS2N7S02D
L2
IND, 2.0 nH, 5%, 0402
Murata
LQG15HS2N0S02D
L3
IND, 880 nH, 10%, 1206
Murata
LQH31HNR88J03
J1
CONN, HDR, RT ANG, 2 PIN, 0.100", T/H Molex
022-28-8021
J2, J3
CONN. 75 OHM, EDGE LAUNCH F
LTI-FSF55NT-P
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
Lighthorse Technology
- 8 of 16 -
TAT 50-0052
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TAT7457
75Ω pHEMT Adjustable Gain RF Amplifier
®
Performance Data for the 2.0 GHz Satellite
Gain
Input Return Loss
23
0
22
-5
21
-10
S11 (dB)
S21 (dB)
20
19
18
17
16
-15
-20
-25
-30
15
-35
14
13
-40
0
600
1200
Freq (MHz)
1800
2400
0
600
CSO & CTB
2400
0
-55
-5
-60
CSO
-10
-65
S22 (dB)
CSO & CTB (dBc)
1800
Output Return Loss
80 ch NTSC @ +8 dBmV/ch FLAT Input
-50
1200
Freq (MHz)
-70
-75
-80
-85
-20
-25
-30
CTB
-90
-15
-35
-95
-100
-40
0
100
200
300
400
Freq (MHz)
500
600
0
600
1200
Freq (MHz)
1800
2400
Noise Figure
4.0
NF (dB)
3.2
2.4
1.6
0.8
0.0
0
600
1200
Freq (MHz)
1800
2400
Notes:
(1) VDD = +5 V, IDD = 120 mA
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
75Ω pHEMT Adjustable Gain RF Amplifier
®
Detailed Device Description
The TAT7457 was designed to be a low cost general
purpose amplifier suitable for a wide range of applications.
2
Bias
Network
The TAT7457 is a high gain cascode amplifier with no
internal shunt feedback.
3
3
1
2
1
An on-chip biasing network sets the operating conditions for
the FETs. This network stabilizes bias current against
changes in temperature as well as against the normal
process variations expected from wafer to wafer. Stabilized
bias current will lead to more consistent RF performance.
Cascode
large
3
1
2
Simplified
RFIC Schematic
Customers may set the gain and return loss of their
amplifier by selecting an appropriate external feedback
resistor.
APPLICATION SCHEMATIC
TAT
7457
Feedback
Resistor
1
Reducing the value of the feedback resistor will reduce the
gain and lower the input and output impedances.
0.1uF
Low noise TIA designers may set the value of feedback to
a high value (>1k ohm) for best performance.
FIG. 1
Biasing through
VNA Bias Tee
TAT7457 Open Loop Gain in 75 ohms
30
0
-5
S21 (dB)
20
-10
DB(|S(2,1)|) (L)
No Feedback
DB(|S(2,2)|) (R)
No Feedback
15
-15
DB(|S(1,1)|) (R)
No Feedback
10
-20
5
Return Losses (dB)
25
There are no on-chip capacitors that limit the low frequency
response, enabling the TAT7457 frequency response to
extend to DC. The open loop gain (no external feedback)
and high frequency gain performance is shown in the plot
to the left.
-25
5v, 105mA
0
-30
0
2
4
Frequency (GHz)
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
6
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TAT7457
®
75Ω pHEMT Adjustable Gain RF Amplifier
Distortion and noise performance may be optimized with simple changes to the application circuit.
Noise performance may be improved by adding a large resistor R3 of approximately 20 kΩ to ground. This resistor will
reduce the bias current and improve noise.
Best distortion occurs on a 6v supply; however, for improved distortion on a 5V supply, bias current may be increased by
adding a large pull up resistor R5 of approximately 75 kΩ in parallel with the feedback capacitor.
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
75Ω pHEMT Adjustable Gain RF Amplifier
®
Pin Configuration and Description
Backside Paddle - GND
1
RF IN
2
GND
3
RF OUT / VDD
External feedback circuit for gain
and return loss adjustment.
Top View
Pin Number
1
Label
RF IN
Description
RF Input
2
GND
Internally Not Connected
3
RF OUT/VDD
RF Output
Ground. Use recommended via pattern to minimize inductance and thermal
resistance. See PCB Mounting Pattern for suggested footprint.
Backside Paddle
GND
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
®
75Ω pHEMT Adjustable Gain RF Amplifier
Package Dimensions
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
®
75Ω pHEMT Adjustable Gain RF Amplifier
Package Marking
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
®
75Ω pHEMT Adjustable Gain RF Amplifier
PCB Mounting Pattern
Notes:
1. Ground / thermal vias are critical for the proper performance of this device. Vias should use a .35 mm (#80/.0135”) diameter drill and have a
final, plated thru diameter of .25 mm (.010”).
2. Add as much copper as possible to inner and outer layers near the part to ensure optimal thermal performance.
3. RF trace width depends upon the PC board material and construction.
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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TAT7457
75Ω pHEMT Adjustable Gain RF Amplifier
®
Handling Precautions
Parameter
Rating
Standard
ESD – Human Body Model (HBM)
Class 1A (500V)
ESDA / JEDEC-A114
ESD – Charged Device Model (CDM)
Class 3 (1000V)
JEDEC JESD22-C101F
MSL1 – Moisture Sensitivity Level
Level 1
IPC/JEDEC J-STD-020
Caution!
ESD-Sensitive Device
Solderability
Compatible with both lead-free (260 °C max. reflow temp.) and tin/lead (245 °C max. reflow temp.) soldering processes.
Solder profiles available upon request.
Contact plating: Matte Sn
RoHS Compliance
This part is compliant with 2011/65/EU RoHS directive (Restrictions on the Use of Certain Hazardous Substances in Electrical and
Electronic Equipment) as amended by Directive 2015/863/EU.
This product also has the following attributes:
• Lead Free
• Halogen Free (Chlorine, Bromine)
•
•
•
•
Antimony Free
TBBP-A (C15H12Br402) Free
PFOS Free
SVHC Free
Pb
Contact Information
For the latest specifications, additional product information, worldwide sales and distribution locations:
Tel: 1-844-890-8163
Web: www.qorvo.com
Email: customer.support@qorvo.com
Important Notice
The information contained herein is believed to be reliable; however, Qorvo makes no warranties regarding the information contained
herein and assumes no responsibility or liability whatsoever for the use of the information contained herein. All information contained
herein is subject to change without notice. Customers should obtain and verify the latest relevant information before placing orders for
Qorvo products. The information contained herein or any use of such information does not grant, explicitly or implicitly, to any party any
patent rights, licenses, or any other intellectual property rights, whether with regard to such information itself or anything described by
such information. THIS INFORMATION DOES NOT CONSTITUTE A WARRANTY WITH RESPECT TO THE PRODUCTS DESCRIBED
HEREIN, AND QORVO HEREBY DISCLAIMS ANY AND ALL WARRANTIES WITH RESPECT TO SUCH PRODUCTS WHETHER
EXPRESS OR IMPLIED BY LAW, COURSE OF DEALING, COURSE OF PERFORMANCE, USAGE OF TRADE OR OTHERWISE,
INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Without limiting the generality of the foregoing, Qorvo products are not warranted or authorized for use as critical components in medical,
life-saving, or life-sustaining applications, or other applications where a failure would reasonably be expected to cause severe personal
injury or death.
Copyright 2019 © Qorvo, Inc. | Qorvo is a registered trademark of Qorvo, Inc.
Data Sheet –Rev H, Jan 7, 2019 | Subject to change without notice
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