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Dual Matched Broadband RF DVGA
3.4GHz to 3.8GHz
F0448
Datasheet
Description
The F0448 is a 3.4GHz to 3.8GHz dual RF digital variable gain
amplifier (DVGA) designed for use in receivers.
This dual RF DVGA provides two independent receiver channels
each with 13dB typical maximum gain and 6dB noise figure
designed to operate with a single +5V supply. For each channel,
gain control is split into three separate attenuators: DSA0, a single
6dB step using a single control pin; DSA1, a 23dB SPI-controlled
gain adjustment in 1dB steps; and DSA2, includes 18dB
attenuation in 6dB steps controlled using two control pins. The
F0448 offers +37dBm nominal output IP3 using 220mA total ICC.
This device is packaged in a 6 × 6 mm, 36-QFN with 50Ω single-
ended RF input and RF output impedances for ease of integration
into the signal-channel lineup for each of the two channels.
Competitive Advantage
High reliability
High linearity
Low DC current
Zero DistortionTM technology
GlitchFreeTM technology
Typical Applications
Multi-mode, Multi-carrier Receivers
PHS/PAS Base Stations
Distributed Antenna Systems
Digital Radio
Features
RF Frequency Range: 3.4GHz to 3.8GHz
Dual Channel RF amp and DSAs for Diversity / MIMO
Receivers
< 2dB overshoot between DSA transitions
13dB typical maximum gain at 3.6GHz
DSA0: Single 6dB coarse step
DSA1: 23dB total gain range in 1dB steps
DSA2: 18dB gain range in 6dB steps
+37dBm OIP3 at 3.6GHz
6dB Noise figure at 3.6GHz
+5V Supply voltage
ICC = 220mA
Independent standby: 7mA standby current
SPI interface for DSA1
1-bit control for DSA0
2-bit control for DSA2
50Ω input and output impedance
Internally matched
Temperature range: -40°C to +105°C
6 × 6 × 0.75 mm 36-QFN package
Block Diagram
F0448
DSA0A
DSA1A
RFIN_A
DATA
CSb
CLK
VCTRL0
VCTRL1
VCTRL2
STBY
RFIN_B
2
Deco de
2 Logic / Bias
2
2
2
6dB
6dB
23dB
23dB
DSA0B
DSA1B
RF AMP A
DSA2A
18dB
Glitch - Free TTMM
Zero - Distortion TTMM 18dB
RF AMP B
DSA2B
RFOUT_A
RFOUT_B
© 2018 Integrated Device Technology, Inc.
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October 24, 2018

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F0448 Datasheet
Contents
Pin Assignments....................................................................................................................................................................................................5
Pin Descriptions.....................................................................................................................................................................................................6
Absolute Maximum Ratings...................................................................................................................................................................................7
Recommended Operating Conditions ...................................................................................................................................................................7
Electrical Characteristics .......................................................................................................................................................................................8
Thermal Characteristics.......................................................................................................................................................................................11
Typical Operating Conditions (TOC) ...................................................................................................................................................................11
Typical Performance Characteristics...................................................................................................................................................................12
Programming .......................................................................................................................................................................................................18
Serial Control – DSA1 ................................................................................................................................................................................18
Parallel Control Mode – DSA0, DSA2, STBY......................................................................................................................................................21
Typical Application Circuit ...................................................................................................................................................................................22
Evaluation Kit Picture ..........................................................................................................................................................................................23
Evaluation Kit / Applications Circuit .....................................................................................................................................................................24
Evaluation Kit Operation......................................................................................................................................................................................26
Power Supply Setup ...................................................................................................................................................................................26
GND Jumpers.............................................................................................................................................................................................26
Standby (STBY) Pin ...................................................................................................................................................................................27
Serial Control..............................................................................................................................................................................................28
Parallel Control Pins ...................................................................................................................................................................................29
Power-On Procedure..................................................................................................................................................................................29
Power-Off Procedure..................................................................................................................................................................................29
Application Information ........................................................................................................................................................................................30
Power Supplies...........................................................................................................................................................................................30
RSET and RDSET......................................................................................................................................................................................30
Control Pin Interface...................................................................................................................................................................................30
Package Outline Drawings ..................................................................................................................................................................................31
Marking Diagram .................................................................................................................................................................................................31
Ordering Information............................................................................................................................................................................................31
Revision History...................................................................................................................................................................................................32
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F0448 Datasheet
List of Figures
Figure 1. Pin Assignments for 6 × 6 mm 32-QFN – Top View............................................................................................................................5
Figure 2. Maximum Gain vs. Frequency...........................................................................................................................................................12
Figure 3. Gain vs. Frequency for DSA0 Settings..............................................................................................................................................12
Figure 4. Gain vs. Frequency for DSA1 Settings..............................................................................................................................................12
Figure 5. Gain vs. Frequency for DSA2 Settings..............................................................................................................................................12
Figure 6. Stability vs. Frequency as a Function of Voltage and Temperature ..................................................................................................12
Figure 7. Input Return Loss for DSA0 Settings.................................................................................................................................................13
Figure 8. Output Return Loss for DSA0 Settings..............................................................................................................................................13
Figure 9. Input Return Loss for DSA1 Settings.................................................................................................................................................13
Figure 10. Output Return Loss for DSA1 Settings..............................................................................................................................................13
Figure 11. Input Return Loss for DSA2 Settings.................................................................................................................................................13
Figure 12. Output Return Loss for DSA2 Settings..............................................................................................................................................13
Figure 13. Reverse Location for DSA0 Settings .................................................................................................................................................14
Figure 14. Phase Deviation Between Adjacent States vs. DSA0 Setting ...........................................................................................................14
Figure 15. Reverse Location for DSA1 Settings .................................................................................................................................................14
Figure 16. Phase Deviation Between Adjacent States vs. DSA1 Setting ...........................................................................................................14
Figure 17. Reverse Location for DSA2 Settings .................................................................................................................................................14
Figure 18. Phase Deviation Between Adjacent States vs. DSA2 Setting ...........................................................................................................14
Figure 19. DSA0 Absolute Attenuation Error (INL) .............................................................................................................................................15
Figure 20. DSA0 Attenuator Step Error (DNL)...................................................................................................................................................15
Figure 21. DSA1 Absolute Attenuation Error (INL) .............................................................................................................................................15
Figure 22. DSA1 Attenuator Step Error (DNL)....................................................................................................................................................15
Figure 23. DSA2 Absolute Attenuation Error (INL) .............................................................................................................................................15
Figure 24. DSA2 Attenuator Step Error (DNL)....................................................................................................................................................15
Figure 25. OIP3 vs. Frequency with POUT = 0dBm/Tone and Max Gain .............................................................................................................16
Figure 26. OIP3 vs. Frequency with POUT = -10dBm/Tone and Max Gain..........................................................................................................16
Figure 27. OIP3 vs. Frequency with POUT = -18dBm/Tone and DSA2 = 18dB....................................................................................................16
Figure 28. OIP3 vs. Frequency as a Function of Tone Spacing with POUT = 0dBm/Tone...................................................................................16
Figure 29. OIP3 vs. Frequency with POUT = 0dBm/Tone and DSA0 = 6dB.........................................................................................................16
Figure 30. Wideband OIP2 vs. Frequency with POUT = -10dBm/Tone ................................................................................................................17
Figure 31. Wideband OIP2 vs. Frequency with POUT = 0dBm/Tone ...................................................................................................................17
Figure 32. NF vs. Frequency as a Function of Temperature at Max Gain..........................................................................................................17
Figure 33. NF vs. Frequency as a Function of Temperature with DSA1 = 22dB................................................................................................17
Figure 34. Gain Compression at fRF = 3.6GHz ...................................................................................................................................................17
Figure 35. EVKit Connector and Trace Losses ..................................................................................................................................................17
Figure 36. Serial Register Data Flow Diagram (LSB Clock in First) ...................................................................................................................18
Figure 37. DSA1 Default Condition.....................................................................................................................................................................18
Figure 38. Serial Timing Diagram .......................................................................................................................................................................20
Figure 39. Electrical Schematic ..........................................................................................................................................................................22
Figure 40. Top View............................................................................................................................................................................................23
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F0448 Datasheet
Figure 41. Bottom View ......................................................................................................................................................................................23
Figure 42. Electrical Schematic ..........................................................................................................................................................................24
Figure 43. Power Supply Connections – Top View.............................................................................................................................................26
Figure 44. Power Supply Connections – Bottom View .......................................................................................................................................26
Figure 45. Two Ground Jumper Connections.....................................................................................................................................................26
Figure 46. Two Standby Pin Connections ..........................................................................................................................................................27
Figure 47. Two Jumpers for Serial Programming Connections ..........................................................................................................................28
Figure 48. Parallel Pin Connections ...................................................................................................................................................................29
Figure 49. Control Pin Interface..........................................................................................................................................................................30
List of Tables
Table 1. Pin Descriptions...................................................................................................................................................................................6
Table 2. Absolute Maximum Ratings.................................................................................................................................................................7
Table 3. Recommended Operating Conditions .................................................................................................................................................7
Table 4. Electrical Characteristics .....................................................................................................................................................................8
Table 5. Package Thermal Characteristics......................................................................................................................................................11
Table 6. DSA1 Attenuation Word Truth Table (LSB = First In)........................................................................................................................19
Table 7. SPI Timing Diagram Values for Figure 38 .........................................................................................................................................20
Table 8. DSA0 Truth Table..............................................................................................................................................................................21
Table 9. DSA2 Truth Table..............................................................................................................................................................................21
Table 10. STANDBY Truth Table ......................................................................................................................................................................21
Table 11. Bill of Material (BOM) ........................................................................................................................................................................25
Table 12. J13 Header Pins ................................................................................................................................................................................28
Table 13. Attenuator Control Using One Latch Signal.......................................................................................................................................29
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Pin Assignments
Figure 1. Pin Assignments for 6 × 6 mm 32-QFN – Top View
F0448 Datasheet
F0448 36 35 34 33 32 31 30 29 28
DSA0_A
RFin_A 1
DSA1_A
GND 2
VCTRL0_A 3
SPI Data 4
SPI Clk 5
Decode Logic
VCC 6
VCTRL0_B 7
GND 8
RFin_B 9
DSA0_B
DSA1_B
DSA2_A
Bias Control
DSA2_B
10 11 12 13 14 15 16 17 18
27 RFout_A
26 GND
25 VCC
24 Rset
23 VCC
22 RDset
21 VCC
20 GND
19 RFout_B
© 2018 Integrated Device Technology, Inc.
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October 24, 2018