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Integrated Device Technology - 7-bit 0.25 dB Digital Step Attenuator

Numéro de référence IDTF1950
Description 7-bit 0.25 dB Digital Step Attenuator
Fabricant Integrated Device Technology 
Logo Integrated Device Technology 





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IDTF1950 fiche technique
7-bit 0.25 dB Digital Step Attenuator
GENERAL DESCRIPTION
This document describes the specification for the
IDTF1950 Digital Step Attenuator. The F1950 is part of a
family of Glitch-FreeTM DSAs optimized for the demanding
requirements of communications Infrastructure. These
devices are offered in a compact 4x4 QFN package with
50 impedances for ease of integration into the radio
system.
COMPETITIVE ADVANTAGE
Digital step attenuators are used in Receivers and
Transmitters to provide gain control. The IDTF1950 is a
7-bit step attenuator optimized for these demanding
applications. The silicon design has very low insertion
loss and low distortion (+65 dBm IP3I.) The device has
pinpoint accuracy and settles to final attenuation value
within 400 nsec. Most importantly, the F1950 includes
IDT’s Glitch-FreeTM technology which results in less
than 0.6 dB of overshoot ringing during MSB transitions.
This is in stark contrast to competing DSAs that glitch as
much as 10 dB during MSB transitions (see p.10)
Lowest insertion loss for best SNR
Glitch-FreeTM when transitioning –
won’t damage PA or ADC
Extremely accurate with low distortion
Glitch-FreeTTMM
APPLICATIONS
Base Station 2G, 3G, 4G, TDD radiocards
Repeaters and E911 systems
Digital Pre-Distortion
Point to Point Infrastructure
Public Safety Infrastructure
WIMAX Receivers and Transmitters
Military Systems, JTRS radios
RFID handheld and portable readers
Cable Infrastructure
PART# MATRIX
Part#
F1950
F1951
F1952
Freq range
150 - 4000
100 - 4000
100 – 4000
Resolution
/ Range
0.25 / 31.75
0.50 / 31.5
0.50 / 15.5
Control
Parallel &
Serial
Serial Only
Serial Only
IL
-1.3
-1.2
-0.9
Pinout
PE
HITT
HITT
IDTF1950
DATASHEET
150 MHz to 4000 MHz
FEATURES
Glitch-FreeTM, < 0.6 dB transient overshoot
Spurious Free Design
3V to 5V supply
Attenuation Error < 0.3 dB @ 2 GHz
Low Insertion Loss < 1.3 dB @ 2 GHz
Excellent Linearity +65 dBm IP3I
Fast settling time, < 400 nsec
Class 2 JEDEC ESD (> 2kV HBM)
Serial & Parallel Interface 31.75 dB Range
4x4 mm Thin QFN 24 pin package
DEVICE BLOCK DIAGRAM
RF1 RF2
Bias
DEC
SPI
VMODE VDD
7
D[6:0] CLK DATA LE
ORDERING INFORMATION
Omit IDT
prefix
0.8 mm height
package
Tape &
Reel
IDTF1950NBGI8
RF product Line
Green
Industrial
Temp range
Glitch-FreeTM Digital Step Attenuator
1
Rev1 March 2012

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