IDTF2255NLGK_18 [IDT]
Voltage Variable RF Attenuator;
| 型号： | IDTF2255NLGK_18 |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Voltage Variable RF Attenuator |
| 文件： | 总26页 (文件大小：2068K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
FEATURES
GENERAL DESCRIPTION
Low Insertion Loss: 1.1dB @ 500MHz
Typical / Min IIP3: 60dBm / 46dBm
Typical / Min IIP2: 98dBm / 74dBm
33dB Attenuation Range
The IDTF2255 is a low insertion loss Voltage Variable
RF Attenuator (VVA) designed for a multitude of
wireless and other RF applications. This device covers
a broad frequency range from 1MHz to 3000MHz. In
addition to providing low insertion loss, the IDTF2255
provides excellent linearity performance over its entire
voltage control and attenuation range.
Bi-directional RF ports
+36dBm Input P1dB compression
VMODE pin allows either positive or negative
control response
The F2255 uses a single positive supply voltage of
3.15V to 5.25V. Other features include the VMODE pin
allowing either positive or negative voltage control
slope vs attenuation and multi-directional operation
meaning the RF input can be applied to either RF1 or
RF2 pins. Control voltage ranges from 0V to 3.6V
using either positive or negative control voltage slope.
Linear-in-dB attenuation characteristic
Supply voltage: 3.15V to 5.25V
VCTRL range: 0V to 3.6V using 5V supply
+105°C max operating temperature
3mm x 3mm, 16-pin QFN package
DEVICE BLOCK DIAGRAM
COMPETITIVE ADVANTAGE
IDTF2255 provides extremely low insertion loss and
superb IP3, IP2, Return Loss and Slope Linearity across
the control range. Comparing to competitive VVAs this
device is better as follows:
Control
Operation down to 1MHz
Insertion Loss @ 500MHz: 1.1dB
Maximum Attenuation Slope: 33dB/Volt
Minimum Output IP3: 35dBm
Minimum Input IP2: 74dBm
RF2
RF1
High Operating Temperature: +105°C
ORDERING INFORMATION
APPLICATIONS
Omit IDT
prefix
Tape &
Reel
0.9 mm height
package
Base Station 2G, 3G, 4G
Portable Wireless
Repeaters and E911 systems
Digital Pre-Distortion
Point to Point Infrastructure
Public Safety Infrastructure
Satellite Receivers and Modems
WIMAX Receivers and Transmitters
Military Radios covering HF, VHF, UHF
RFID handheld and portable readers
Cable Infrastructure
IDTF2255NLGK8
RF product Line
Green
PART# MATRIX
IIP3
RF Freq Range
Insertion Loss
(dB)
Pinout
Compatibility
Part#
(MHz)
(dBm)
+65
Wireless LAN
Test / ATE Equipment
F2250
F2255
50 - 6000
1 - 3000
1.4 (at 2GHz)
RFMD
1.1 (at 500MHz)
+60
+65
F2258
50 - 6000
1.4 (at 2GHz)
Hittite
© 2018 Integrated Device Technology, Inc.
1
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
ABSOLUTE MAXIMUM RATINGS
Parameter / Condition
VDD to GND
VMODE to GND
Symbol
VDD
VMODE
VCTRL
VRF
Min
-0.3
-0.3
-0.3
-0.3
Max
5.5
Units
V
V
V
V
Minimum ( VDD, 3.9 )
Minimum ( VDD, 4.0 )
0.3
VCTRL to GND
VDD = 0V to 5.25V
RF1, RF2 to GND
RF1 or RF2 Input Power applied for 24 hours maximum
(VDD applied @ 2GHz and Tc=+85°C)
RF1 or RF2 Continuous Operating Power
PMAX24
30
dBm
PMAX_OP
TJMAX
TST
See Figure 1
+150
dBm
°C
°C
Maximum Junction Temperature
Storage Temperature Range
-65
+150
Lead Temperature (soldering, 10s)
ESD Voltage– HBM (Per ESD STM5.1-2007)
ESD Voltage – CDM (Per ESD STM5.3.1-2009)
TLEAD
VESDHBM
VESDCDM
+260
Class 2
Class C3
°C
FIGURE 1: MAXIMUM OPERATING RF INPUT POWERS VS. RF FREQUENCY
Stresses above those listed above may cause permanent damage to the device. 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.
PACKAGE THERMAL AND MOISTURE CHARACTERISTICS
ΘJA (Junction – Ambient)
ΘJC (Junction – Case) The Case is defined as the exposed paddle
Moisture Sensitivity Rating (Per J-STD-020)
80.6°C/W
5.1°C/W
MSL 1
© 2018 Integrated Device Technology, Inc.
2
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
IDTF2255 OPERATING CONDITIONS
Parameter
Operating Frequency Range
Supply Voltage
Symbol
FRF
Condition
Min
1
3.15
1.17
1.17
0
Typ
Max
3000
5.25
3.6 2
VDD -0.3V
0.63
3.6
VDD-0.3
2
38
Units
MHz
V
VDD
VDD > 3.9V
VDD = 3.15 to 3.9V
VIH
VIL
VMODE Logic
V
VDD = 3.9V to 5.25V
VDD = 3.15V to 3.9V
0
0
VCTRL Range
VCTRL
V
Supply Current
Logic Current
ICTRL Current
IDD
IMODE
ICTRL
0.50 1
-1.0
-1.0
1.15
mA
μA
μA
14
See
Figure 1
RF Operating Power 3
PMAXCW
dBm
Ω
RF1 Port Impedance
RF2 Port Impedance
ZRF1
ZRF2
50
50
Operating Temperature
Range
Exposed Paddle
Temperature
TCASE
-40
+105
°C
Operating Conditions Notes:
1 – Items in min/max columns in bold italics are Guaranteed by Test.
2 – Items in min/max columns that are not bold/italics are Guaranteed by Design Characterization.
3 – Refer to the Maximum Operating RF Input Power vs. RF Frequency curves in Figure 1.
© 2018 Integrated Device Technology, Inc.
3
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
IDTF2255 SPECIFICATIONS
Refer to EVKit / Applications Circuit, VDD = +3.3V, TC = +25°C, signals applied to RF1 input, FRF = 500MHz, minimum
attenuation, PIN = 0dBm for small signal parameters, +20dBm for single tone linearity tests, +20dBm per tone for
two tone tests, two tone delta frequency = 80MHz, PCB board traces and connector losses are de-embedded unless
otherwise noted. Refer to Typical Operating Curves for performance over entire frequency band.
Parameter
Insertion Loss, IL
Symbol
AMIN
Condition
Minimum Attenuation
Min
Typ
1.1
Max
Units
dB
1.7 1
Maximum attenuation
AMAX
33
34.6
dB
At 36dB attenuation
relative to Insertion Loss
At 18dB attenuation
relative to Insertion Loss
ΦΔMAX
27
8
Insertion Phase Δ
deg
dBm
dB
ΦΔMID
Input 1dB Compression 3
P1dB
36
23
22
23
30
23
22
23
24
60
46
35
20MHz
500MHz
2000MHz
3000MHz
20MHz
500MHz
2000MHz
3000MHz
Minimum RF1 Return Loss
over control voltage range
S11
S22
Minimum RF2 Return Loss
over control voltage range
dB
Input IP3
Input IP3 over Attenuation
Minimum Output IP3
IIP3
IIP3ATTEN
OIP3MIN
All attenuation settings
Maximum attenuation
PIN + IM2dBC
IM2 term is F1+F2
All attenuation settings
PIN + H2dBc
44 2
dBm
dBm
,
Input IP2
IIP2
98
Minimum Input IP2
Input IH2
Input IH3
IIP2MIN
HD2
HD3
74
82
49
dBm
dBm
dBm
PIN + (H3dBc/2)
Any 1dB step in the 0dB
to 33dB control range
50% VCTRL to RF settled to
within ± 0.1dB
Settling Time
TSETTL0.1dB
15
μSec
Specification Notes:
1 – Items in min/max columns in bold italics are Guaranteed by Test.
2 – Items in min/max columns that are not bold/italics are Guaranteed by Design Characterization.
3 – The input 1dB compression point is a linearity figure of merit. Refer to Absolute Maximum Ratings section
along with Figure 1 for the maximum RF input power vs. RF frequency.
© 2018 Integrated Device Technology, Inc.
4
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CURVES
UNLESS OTHERWISE NOTED, THE FOLLOWING CONDITIONS APPLY:
VDD = +3.3V or +5.0V
TC = +25ºC
VMODE = 0V
RF trace and connector losses are de-embedded for S-parameters
Pin = 0dBm for all small signal tests
Pin = +20dBm for single tone linearity tests (RF1 port driven)
Pin = +20dBm/tone for two tone linearity tests (RF1 port driven)
Two tone frequency spacing = 80MHz
© 2018 Integrated Device Technology, Inc.
5
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CONDITIONS [S2P BROADBAND PERFORMANCE] (-1-)
Attenuation vs. VCTRL
Attenuation vs. Frequency
0
0
25C / 10MHz
25C / 50MHz
-5
-5
-10
-15
-20
-25
-30
-35
-40
25C / 100MHz
25C / 250MHz
25C / 500MHz
25C / 900MHz
25C / 1200MHz
25C / 1900MHz
25C / 2700MHz
-10
-15
-20
-25
-30
-35
-40
-45
25C / 0.0V
25C / 1.2V
25C / 1.8V
25C / 0.8V
25C / 1.4V
25C / 2.2V
25C / 1.0V
25C / 1.6V
25C / 2.8V
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
0
500
1000
1500
2000
2500
3000
VCTRL (Volts)
Frequency(MHz)
Attenuation Delta to 25C vs. VCTRL
4
-40C / 11MHz
-40C / 251MHz
-40C / 900MHz
105C / 11MHz
105C / 251MHz
105C / 900MHz
3
2
1
0
-1
-2
-3
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
VCTRL (V)
© 2018 Integrated Device Technology, Inc.
6
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CURVES [S2P VS. VCTRL] (-2-)
Attenuation vs. VCTRL
Attenuation Slope vs. VCTRL
0
40
35
30
25
20
15
10
5
4MHz
25C
25C
15MHz
-5
-10
-15
-20
-25
-30
-35
-40
60MHz
200MHz
600MHz
1200MHz
2100MHz
4MHz
15MHz
200MHz
1200MHz
60MHz
600MHz
2100MHz
0
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
VCTRL (V)
VCTRL (V)
RF2 Return Loss vs. VCTRL
RF1 Return Loss vs. VCTRL
0
0
4MHz
15MHz
200MHz
4MHz
15MHz
200MHz
1200MHz
25C
25C
-5
-10
-15
-20
-25
-30
-35
-40
60MHz
600MHz
2100MHz
-5
-10
-15
-20
-25
-30
-35
-40
60MHz
600MHz
2100MHz
1200MHz
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
VCTRL (V)
VCTRL (V)
Insertion Phase Slope vs. VCTRL
Insertion Phase vs. VCTRL
110
80
4MHz
15MHz
60MHz
1200MHz
(positive phase = electrically shorter)
4MHz
25C
200MHz
2100MHz
600MHz
70
60
50
40
30
20
10
0
15MHz
90
70
50
30
10
-10
60MHz
200MHz
600MHz
1200MHz
2100MHz
25C
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
VCTRL (V)
VCTRL (V)
© 2018 Integrated Device Technology, Inc.
7
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CONDITIONS [S2P VS. VCTRL & TEMPERATURE] (-3-)
Attenuation Response vs. VCTRL
Attenuation Slope vs. VCTRL
0
45
40
35
30
25
20
15
10
5
-40C / 15MHz
-40C / 500MHz
-40C / 1200MHz
25C / 15MHz
25C / 500MHz
25C / 1200MHz
105C / 15MHz
105C / 500MHz
105C / 1200MHz
-40C / 15MHz
-40C / 500MHz
-40C / 1200MHz
25C / 15MHz
25C / 500MHz
25C / 1200MHz
105C / 15MHz
105C / 500MHz
105C / 1200MHz
-5
-10
-15
-20
-25
-30
-35
-40
0
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
VCTRL (V)
VCTRL (V)
RF1 Return Loss vs. VCTRL
RF2 Return Loss vs. VCTRL
0
0
-40C / 15MHz
-40C / 500MHz
-40C / 1200MHz
25C / 15MHz
25C / 500MHz
25C / 1200MHz
105C / 15MHz
105C / 500MHz
105C / 1200MHz
-40C / 15MHz
-40C / 500MHz
-40C / 1200MHz
25C / 15MHz
25C / 500MHz
25C / 1200MHz
105C / 15MHz
105C / 500MHz
105C / 1200MHz
-5
-10
-15
-20
-25
-30
-35
-40
-5
-10
-15
-20
-25
-30
-35
-40
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
VCTRL (V)
VCTRL (V)
Insertion Phase vs. VCTRL
Insertion Phase Slope vs. VCTRL
60
80
-40C / 15MHz
-40C / 500MHz
-40C / 1200MHz
25C / 15MHz
25C / 500MHz
25C / 1200MHz
105C / 15MHz
105C / 500MHz
105C / 1200MHz
-40C / 15MHz
-40C / 500MHz
-40C / 1200MHz
25C / 15MHz
25C / 500MHz
25C / 1200MHz
105C / 15MHz
105C / 500MHz
105C / 1200MHz
(positive phase = electrically shorter)
70
60
50
40
30
20
10
0
50
40
30
20
10
0
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
VCTRL (V)
VCTRL (V)
© 2018 Integrated Device Technology, Inc.
8
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CONDITIONS [S2P VS. ATTENUATION & TEMPERATURE] (-4-)
RF1 Return Loss vs. Attenuation
RF1 Return Loss vs. Attenuation
0
0
-40C / 15MHz
-40C / 500MHz
-40C / 1200MHz
25C / 15MHz
25C / 500MHz
25C / 1200MHz
105C / 15MHz
105C / 500MHz
105C / 1200MHz
25C / 4MHz
25C / 15MHz
25C / 60MHz
25C / 600MHz
25C / 2100MHz
25C / 200MHz
25C / 1200MHz
-5
-10
-15
-20
-25
-30
-35
-40
-5
-10
-15
-20
-25
-30
-35
-40
0
4
8
12
16
20
24
28
32
36
36
36
0
4
8
12
16
20
24
28
32
36
36
36
Attenuation (dB)
Attenuation (dB)
RF2 Return Loss vs. Attenuation
RF2 Return Loss vs. Attenuation
0
0
25C / 4MHz
25C / 15MHz
25C / 200MHz
25C / 1200MHz
-40C / 15MHz
-40C / 1200MHz
-40C / 500MHz
25C / 15MHz
25C / 60MHz
25C / 600MHz
25C / 2100MHz
-5
-10
-15
-20
-25
-30
-35
-40
-5
25C / 500MHz
105C / 15MHz
105C / 1200MHz
25C / 1200MHz
105C / 500MHz
-10
-15
-20
-25
-30
-35
-40
0
4
8
12
16
20
24
28
32
0
4
8
12
16
20
24
28
32
Attenuation (dB)
Attenuation (dB)
Insertion Phase Δ vs. Attenuation
Insertion Phase Δ vs. Attenuation
80
60
(positive phase = electrically shorter)
-40C / 15MHz
-40C / 500MHz
-40C / 1200MHz
25C / 15MHz
25C / 500MHz
25C / 1200MHz
105C / 15MHz
105C / 500MHz
105C / 1200MHz
25C / 4MHz
70
60
50
40
30
20
10
0
25C / 15MHz
25C / 60MHz
25C / 200MHz
25C / 600MHz
25C / 1200MHz
25C / 2100MHz
50
40
30
20
10
0
0
4
8
12
16
20
24
28
32
0
4
8
12
16
20
24
28
32
Attenuation (dB)
Attenuation (dB)
© 2018 Integrated Device Technology, Inc.
9
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CONDITIONS [S2P VS. FREQUENCY] (-5-)
Min. & Max. Attenuation vs. Frequency
Min. & Max. Attenuation Slope vs. Frequency
40
VCTRL varied from 0.8V to 1.7V
35
30
25
20
15
max slope
10
min slope
5
0
0
500
1000
1500
2000
2500
3000
Frequency(MHz)
Worst-Case RF1 Return Loss vs. Frequency
Worst-Case RF2 Return Loss vs. Frequency
Gain Compression vs. Frequency
Max. Insertion Phase vs. Frequency
1
70
1MHz
125MHz
250MHz
(positive phase = electrically shorter)
60
50
40
500MHz
1000MHz
2700MHz
0.5
0
-0.5
-1
30
-40C
25C
105C
20
10
-1.5
-2
0
0
500
1000
1500
2000
2500
3000
10
14
18
22
26
30
34
38
Frequency(MHz)
RF Input Power (dBm)
© 2018 Integrated Device Technology, Inc.
10
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CONDITIONS [S2P @ LOW FREQUENCY, GROUP DELAY] (-6-)
Min. & Max. Attenuation vs. Low Frequency
Low-Frequency Attenuation vs. VCTRL
0
0
0.5MHz
1.0MHz
3.0MHz
7.0MHz
10.0MHz
50.0MHz
100.0MHz
25C
-5
-5
-10
-15
-20
-25
-30
-35
-40
-45
-10
0.0V
2.8V
-15
-20
-25
-30
-35
-40
-45
0
10
20
30
40
50
60
70
80
90 100
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
Frequency(MHz)
VCTRL (V)
Low-Frequency RF1 Return Loss vs. VCTRL
Low-Frequency RF2 Return Loss vs. VCTRL
0
0
0.5MHz
0.5MHz
1.0MHz
3.0MHz
1.0MHz
3.0MHz
-5
-5
7.0MHz
10.0MHz
7.0MHz
10.0MHz
-10
-10
50.0MHz
100.0MHz
50.0MHz
100.0MHz
-15
-15
-20
-25
-30
-35
-40
-20
-25
-30
-35
-40
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
VCTRL (V)
VCTRL (V)
Group Delay vs. Frequency
200
-40C / 0.8V
-40C / 1.8V
25C / 0.8V
25C / 1.8V
105C / 0.8V
105C / 1.8V
150
100
50
0
-50
-100
0
500
1000
1500
2000
2500
3000
Frequency(MHz)
© 2018 Integrated Device Technology, Inc.
11
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CONDITIONS 500MHZ, VDD=3.3V [IP3, IP2, IH2, IH3 VS. VCTRL, VMODE] (-7-)
Input IP3 vs. VCTRL
Output IP3 vs. VCTRL
80
80
70
60
50
40
30
20
10
0
70
60
50
40
30
20
-40C / Vmode = 0V
25C / Vmode = 0V
105C / Vmode = 0V
-40C / Vmode = 3V
25C / Vmode = 3V
105C / Vmode = 3V
-40C / Vmode = 0V
25C / Vmode = 0V
105C / Vmode = 0V
-40C / Vmode = 3V
25C / Vmode = 3V
105C / Vmode = 3V
0
0.4
0.8
1.2
1.6
2
2.4
2.8
0
0.4
0.8
1.2
1.6
2
2.4
2.8
VCTRL (V)
VCTRL (V)
Output IP2 vs. VCTRL
Input IP2 vs. VCTRL
120
120
110
100
90
110
100
90
80
80
70
-40C / Vmode = 3V
25C / Vmode = 3V
105C / Vmode = 3V
-40C / Vmode = 0V
25C / Vmode = 0V
105C / Vmode = 0V
70
60
-40C / Vmode = 0V
25C / Vmode = 0V
105C / Vmode = 0V
-40C / Vmode = 3V
25C / Vmode = 3V
105C / Vmode = 3V
60
50
50
40
30
40
0
0.4
0.8
1.2
1.6
2
2.4
2.8
0
0.4
0.8
1.2
1.6
2
2.4
2.8
VCTRL (V)
VCTRL (V)
3rd Harm Input Intercept Point vs. VCTRL
2nd Harm Input Intercept Point vs. VCTRL
90
140
130
120
110
100
90
80
70
60
50
-40C / Vmode = 0V
25C / Vmode = 0V
105C / Vmode = 0V
-40C / Vmode = 3V
25C / Vmode = 3V
105C / Vmode = 3V
40
30
20
10
80
-40C / Vmode = 0V
25C / Vmode = 0V
105C / Vmode = 0V
-40C / Vmode = 3V
25C / Vmode = 3V
105C / Vmode = 3V
70
60
50
0
0.4
0.8
1.2
1.6
2
2.4
2.8
0
0.4
0.8
1.2
1.6
2
2.4
2.8
VCTRL (V)
VCTRL (V)
© 2018 Integrated Device Technology, Inc.
12
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CONDITIONS 500MHZ, VDD=3.3V [IPX, IHX VS. VCTRL, RF1/RF2 DRIVEN] (-8-)
Input IP3 vs. VCTRL
Output IP3 vs. VCTRL
80
70
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
70
60
50
40
30
20
60
50
40
30
20
10
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
0
0.4
0.8
1.2
1.6
2
2.4
2.8
0
0.4
0.8
1.2
1.6
2
2.4
2.8
VCTRL (V)
VCTRL (V)
Input IP2 vs. VCTRL
Output IP2 vs. VCTRL
120
120
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
110
100
90
110
100
90
80
80
70
70
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
60
60
50
50
40
30
40
0
0.4
0.8
1.2
1.6
2
2.4
2.8
0
0.4
0.8
1.2
1.6
2
2.4
2.8
VCTRL (V)
VCTRL (V)
3rd Harm Input Intercept Point vs. VCTRL
2nd Harm Input Intercept Point vs. VCTRL
90
130
80
70
60
50
120
110
100
90
40
30
20
10
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
80
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
70
60
50
0
0.4
0.8
1.2
1.6
2
2.4
2.8
0
0.4
0.8
1.2
1.6
2
2.4
2.8
VCTRL (V)
VCTRL (V)
© 2018 Integrated Device Technology, Inc.
13
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CONDITIONS 500MHZ, VDD=3.3V [IP3, IP2, IH2, IH3 VS. ATTENUATION] (-9-)
Input IP3 vs. Attenuation
Output IP3 vs. Attenuation
80
80
-40C
25C
70
60
50
40
30
20
10
70
60
50
40
30
20
105C
-40C
25C
105C
0
4
8
12
16
20
24
28
32
36
0
4
8
12
16
20
24
28
32
36
Attenuation(dB)
Attenuation(dB)
Input IP2 vs. Attenuation
Output IP2 vs. Attenuation
120
120
-40C
25C
110
100
90
110
100
90
105C
80
80
70
70
60
60
-40C
25C
50
50
40
105C
40
30
0
4
8
12
16
20
24
28
32
36
0
4
8
12
16
20
24
28
32
36
Attenuation (dB)
Attenuation (dB)
2nd Harm Input Intercept Point vs. Attenuation
3rd Harm Input Intercept Point vs. Attenuation
140
90
130
120
110
100
90
80
70
60
50
40
80
30
20
10
-40C
25C
-40C
25C
105C
70
60
105C
0
4
8
12
16
20
24
28
32
36
0
4
8
12
16
20
24
28
32
36
Attenuation (dB)
Attenuation (dB)
© 2018 Integrated Device Technology, Inc.
14
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
TYPICAL OPERATING CONDITIONS 500MHZ, VDD=3.3V [IPX, IHX VS. ATTEN, RF1/RF2 DRIVEN] (-10-)
Input IP3 vs. Attenuation
Output IP3 vs. Attenuation
80
70
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
70
60
50
40
30
20
60
50
40
30
20
10
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
0
4
8
12
16
20
24
28
32
36
0
4
8
12
16
20
24
28
32
36
Attenuation (dB)
Attenuation (dB)
Input IP2 vs. Attenuation
Output IP2 vs. Attenuation
120
120
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
110
100
90
110
100
90
80
80
70
70
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
60
60
50
50
40
30
40
0
4
8
12
16
20
24
28
32
36
0
4
8
12
16
20
24
28
32
36
Attenuation (dB)
Attenuation (dB)
3rd Harm Input Intercept Point vs. Attenuation
2nd Harm Input Intercept Point vs. Attenuation
90
130
80
70
60
50
120
110
100
90
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
40
30
20
10
80
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
70
60
50
0
4
8
12
16
20
24
28
32
36
0
4
8
12
16
20
24 28 32 36
Attenuation (dB)
Attenuation(dB)
© 2018 Integrated Device Technology, Inc.
15
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
PACKAGE DRAWING (3MM X 3MM 16 PIN)
© 2018 Integrated Device Technology, Inc.
16
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
LAND PATTERN DRAWING
© 2018 Integrated Device Technology, Inc.
17
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
PINOUT & BLOCK DIAGRAM
16
15
14
13
12
11
10
9
1
GND
NC
GND
Control
2
NC
RF1
NC
3
4
RF2
NC
E.P.
5
6
7
8
© 2018 Integrated Device Technology, Inc.
18
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
PIN DESCRIPTION
Pin
1, 7, 12
Name
GND
Function
Ground these pins as close to the device as possible.
No internal connection. IDT recommends connecting these pins
to GND.
2, 4, 9, 11, 13
NC
RF Port 1. Matched to 50 ohms. Must use an external AC
coupling capacitor as close to the device as possible. For low
frequency operation increase the capacitor value to result in a
low reactance at the frequency of interest.
3
RF1
RTN
RF2
Attenuator Ground Return. Each of these pins require a capacitor
to GND to provide an RF return path. Place the capacitor as
close to the device as possible.
RF Port 2. Matched to 50 ohms. Must use an external AC
coupling capacitor as close to the device as possible. For low
frequency operation increase the capacitor value to result in a
low reactance at the frequency of interest.
5, 6, 8
10
Attenuator control voltage. Apply a voltage in the range as
specified in the Operating Conditions Table. See application
14
15
16
VCTRL
VDD
section for details about VCTRL
.
Power supply input. Bypass to GND with capacitors close as
possible to pin.
Attenuator slope control. Set to logic LOW to enable negative
attenuation slope. Set to logic HIGH to enable positive
attenuation slope.
Exposed Pad. Internally connected to GND. Solder this exposed
pad to a PCB pad that uses multiple ground vias to achieve the
specified RF performance.
VMODE
— EP
© 2018 Integrated Device Technology, Inc.
19
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
APPLICATIONS INFORMATION
Default Start-up
VMODE must be tied to either GND or Logic High. If the VCTRL pin is left floating, the part will power up in the
minimum attenuation state when VMODE = GND, or the maximum attenuation state when VMODE = High.
VCTRL
The voltage level on the VCTRL pin is used to control the attenuation of the F2255. At VCTRL =0V, the
attenuation is a minimum (maximum) in the negative (positive) slope mode. An increasing (decreasing)
voltage on VCTRL produces an increasing (decreasing) attenuation respectively. The VCTRL pin has an on-chip
pull-up ESD diode so VDD should be applied before VCTRL is applied (see Recommended Operating Conditions
for details). If this sequencing is not possible, then resistor R2 in the application circuit should be set to 1kΩ
to limit the current into the VCTRL pin.
VMODE
The VMODE pin is used to set the slope of the attenuation. The attenuation is varied by VCTRL as described in
the next section. Setting VMODE to a logic LOW (HIGH) will set the attenuation slope to negative (positive). A
negative (positive) slope is defined as an increased (decreased) attenuation with increasing VCTRL voltage. The
Evaluation Kit provides an on-board jumper to manually set the VMODE. Install a jumper on header J2 from
VMODE to the pin marked Lo (Hi) to set the device for a negative (positive) slope (see application circuit).
RF1 and RF2 Ports
The F2255 is a bi-directional device, allowing RF1 or RF2 to be used as the RF input. RF1 has some enhanced
linearity performance, and therefore should be used as the RF input, when possible, for best results. The
F2255 has been designed to accept high RF input power levels; therefore, VDD must be applied prior to the
application of RF power to ensure reliability. DC blocking capacitors are required on the RF pins and should
be set to a value that results in a low reactance over the frequency range of interest.
Power Supplies
The supply pin should be bypassed with external capacitors to minimize noise and fast transients. Supply
noise can degrade noise figure and fast transients can trigger ESD clamps and cause them to fail. Supply
voltage change or transients should have a slew rate smaller than 1V/20uS. In addition, all control pins
should remain at 0V (+/-0.3V) while the supply voltage ramps or while it returns to zero.
© 2018 Integrated Device Technology, Inc.
20
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
Control Pin Interface
If control signal integrity is a concern and clean signals cannot be guaranteed due to overshoot, undershoot,
ringing, etc., the following circuit at the input of control pins 14 and 16 is recommended as shown below.
5Kohm
2pf
5Kohm
2pf
VMODE
VCTRL
16
15
14
13
12
11
10
9
1
2
3
4
Control
RF1
RF2
5
6
7
8
© 2018 Integrated Device Technology, Inc.
21
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
EVKIT / APPLICATIONS CIRCUIT
J1
3
1
4
5
VDD
VCC
VCTRL
C1
R1
C2
C3
R2
C4
R3
R5
C5
C6
R4
J2
1
2
3
4
12
GND
NC
GND
RF2
11
10
9
NC
RF2
NC
J3
J4
RF1
3
4
5
3
4
5
1
1
C7
C8
RF1
NC
17
EPAD
U1
J5
C9
C10
C11
VDD
3
4
5
1
VDD
© 2018 Integrated Device Technology, Inc.
22
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
EVKIT PICTURE / LAYOUT (TOP VIEW)
© 2018 Integrated Device Technology, Inc.
23
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
EVKIT PICTURE / LAYOUT (BOTTOM VIEW)
© 2018 Integrated Device Technology, Inc.
24
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
EVKIT BOM
TOP MARKINGS
© 2018 Integrated Device Technology, Inc.
25
Rev 2, February 9, 2018
IDTF2255NLGK
Datasheet
Voltage Variable RF Attenuator
1MHz to 3000MHz
Revision History
Revision
Revision Date
Description of Change
2
1
February 9, 2018 Corrected POD drawing, added revision page
January 30, 2017 Updated GBT limits for IDD, VMODE and VCTRL
November 5, 2015 Initial Release
O
Corporate Headquarters
6024 Silver Creek Valley Road
San Jose, CA 95138
Sales
Tech Support
www.IDT.com/go/support
1-800-345-7015 or 408-284-8200
Fax: 408-284-2775
www.IDT.com
www.IDT.com/go/sales
DISCLAIMER Integrated Device Technology, Inc. (IDT) and its affiliated companies (herein referred to as “IDT”) reserve the ri ght to modify the products and/or specifications described herein at any time,
without notice, at IDT's sole discretion. Performance specifications and operating parameters of the described products are determined in an independent state and are not guaranteed to perform the same
way when installed in customer products. The information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the suitability
of IDT's products for any particular purpose, an implied warranty of merchantability, or non-infringement of the intellectual property rights of others. This document is presented only as a guide and does not
convey any license under intellectual property rights of IDT or any third parties.
IDT's products are not intended for use in applications involving extreme environmental conditions or in life suppor t systems or similar devices where the failure or malfunction of an IDT product can be
reasonably expected to significantly affect the health or safety of users. Anyone using an IDT product in such a manner does so at their own risk, absent an express, written agreement by IDT.
Integrated Device Technology, IDT and the IDT logo are trademarks or registered trademarks of IDT and its subsidiaries in the United States and other countries. Other trademarks used herein are the
property of IDT or their respective third party owners. For datasheet type definitions and a glossary of common terms, visit www.idt.com/go/glossary. All contents of this document are copyright of Integrated
Device Technology, Inc. All rights reserved.
© 2018 Integrated Device Technology, Inc.
26
Rev 2, February 9, 2018
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