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PDF IDTF1951 Data sheet ( Hoja de datos )

Número de pieza IDTF1951
Descripción 6-bit 0.5 dB Digital Step Attenuator
Fabricantes Integrated Device Technology 
Logotipo Integrated Device Technology Logotipo



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No Preview Available ! IDTF1951 Hoja de datos, Descripción, Manual

6-bit 0.5 dB Digital Step Attenuator
GENERAL DESCRIPTION
This document describes the specification for the
IDTF1951 Digital Step Attenuator. The F1951 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 IDTF1951 is a
6-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 F1951 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)
IDTF1951
DATASHEET
100 MHz to 4000 MHz
FEATURES
Glitch-FreeTM, < 0.6 dB transient overshoot
Spurious Free Design
3V to 5V supply
Attenuation Error < 0.2 dB @ 2 GHz
Low Insertion Loss < 1.2 dB @ 2 GHz
Excellent Linearity +65 dBm IP3I
Fast settling time, < 450 nsec
Class 2 JEDEC ESD (> 2kV HBM)
Serial Interface 31.5 dB Range
Stable Integral Non-Linearity over temperature
4x4 mm Thin QFN 24 pin package
DEVICE BLOCK DIAGRAM
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#
F1951
F1950
F1952
Freq range
100 - 4000
150 - 4000
100 – 4000
Resolution
/ Range
0.50 / 31.5
0.25 / 31.5
0.50 / 15.5
Control
Serial Only
Serial Only
Serial Only
IL
-1.2
-1.3
-0.9
Pinout
HITT
PE
HITT
RF1
RF2
Bias
DEC
SPI
RST
VDD CLK SDI CS SDO
ORDERING INFORMATION
Omit IDT
prefix
0.8 mm height
package
Tape &
Reel
IDTF1951NBGI8
RF product Line
Green
Industrial
Temp range
Glitch-FreeTM Digital Step Attenuator
1
Rev2 April 2013

1 page




IDTF1951 pdf
IDTF1951
DATASHEET
6-bit 0.5 dB Digital Step Attenuator
100 MHz to 4000 MHz
SERIAL REGISTER DEFAULT CONDITION [F1951]:
When the device is first powered up, it will default to the Maximum Attenuation setting as described below:
Note that for the F1951 (High or 1) = Attenuation Stepped OUT. (0 or Low) = Attenuation Stepped IN.
Default Register Settings
0000 0000
R0 R1 D0 D1 D2 D3 D4 D5
RSV RSV LSB
MSB
SERIAL REGISTER TIMING TABLE [F1951]:
Interval
Symbol
A
B
C
D
Description
Reset to Serial Setup Time
Serial Data Hold Time
CSb setup delay
Serial Data Out Delay
Min
Spec
20
5
40
8
Max
Spec
100
8
Units
nsec
nsec
nsec
Cycles
Glitch-FreeTM Digital Step Attenuator
5
Rev2 April 2013

5 Page





IDTF1951 arduino
6-bit 0.5 dB Digital Step Attenuator
PIN DIAGRAM (F1951)
TOP View
(looking through the top of the package)
IDTF1951
DATASHEET
100 MHz to 4000 MHz
24 23 22 21 20 19
NC 1
*RF1 2
GND [internal NC] 3
NC 4
SDO 5
NC 6
Exposed Pad
Package Drawing
4 mm x 4 mm package dimension
2.80 mm x 2.80 mm exposed pad
0.5 mm pitch
24 pins
0.75 mm height
0.25 mm pad width
0.40 mm pad length
18 NC
17 *RF2
16 GND [internal NC]
15 NC
14 VDD
13 NC
7 8 9 10 11 12
* Device is RF Bi-Directional
Glitch-FreeTM Digital Step Attenuator
11
Rev2 April 2013

11 Page







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