Linear Technology DC1082A-F - LTC2355-14, 14-bit, 1-ch 3.5Msps SAR ADC (Unipolar, req DC890) DC1082A-F DC1082A-F Fiche De Données

Codes de produits
DC1082A-F
Page de 18
LTC2355-12/LTC2355-14

2355fa
Block Diagram
Features
applications
Description
Serial 12-Bit/14-Bit, 3.5Msps 
Sampling ADCs with Shutdown
The LTC
®
2355-12/LTC2355-14 are 12-bit/14-bit, 3.5Msps 
serial  ADCs  with  differential  inputs.  The  devices  draw 
only  5.5mA  from  a  single  3.3V  supply  and  come  in  a 
tiny 10-lead MSOP package. A Sleep shutdown feature 
further reduces power consumption to 13µW. The com-
bination of speed, low power and tiny package makes the 
LTC2355-12/LTC2355-14 suitable for high speed, portable 
applications.
The 80dB common mode rejection allows users to eliminate 
ground  loops  and  common  mode  noise  by  measuring 
signals differentially from the source.
The devices convert 0V to 2.5V unipolar inputs differentially. 
The absolute voltage swing for A
IN
+
 and A
IN
 extends from 
ground to the supply voltage.
The serial interface sends out the conversion results during 
the 16 clock cycles following a CONV rising edge for com-
patibility with standard serial interfaces. If two additional 
clock cycles for acquisition time are allowed after the data 
stream in between conversions, the full sampling rate of 
3.5Msps can be achieved with a 63MHz clock.
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear 
Technology Corporation. All other trademarks are the property of their respective owners.
n
  3.5Msps Conversion Rate
n
  74.2dB SINAD at 14-Bits, 71.1dB SINAD at 12-Bits
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  Low Power Dissipation: 18mW
n
  3.3V Single Supply Operation
n
  2.5V Internal Bandgap Reference can be Overdriven
n
  3-Wire SPI-Compatible Serial Interface
n
  Sleep (13µW) Shutdown Mode
n
  Nap (4mW) Shutdown Mode
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  80dB Common Mode Rejection
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  0V to 2.5V Unipolar Input Range
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  Tiny 10-Lead MSOP Package
n
  Communications
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  Data Acquisition Systems
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  Uninterrupted Power Supplies
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  Multiphase Motor Control
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  Multiplexed Data Acquisition
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  RFID
THD, 2nd, 3rd and SFDR  
vs Input Frequency
+
1
2
7
3
4
S & H
GND
EXPOSED PAD
LTC2355-14
V
REF
10µF
A
IN
A
IN
+
14-BIT ADC
3.3V
10µF
14
14-BIT LA
TCH
8
10
9
THREE-
STATE
SERIAL
OUTPUT
PORT
2.5V
REFERENCE
TIMING
LOGIC
V
DD
SDO
CONV
SCK
2355 TA01
5
6
11
FREQUENCY (MHz)
0.1
–80
THD, 2nd, 3rd (dB)
–74
–68
–62
–56
1
10
100
2355 G02
–86
–92
–98
–104
–110
–50
THD
2nd
3rd