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LTC1745CFW#TR

Description
IC adc smpl 12bit 25msps 48tssop
Categorysemiconductor    Analog mixed-signal IC   
File Size232KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1745CFW#TR Overview

IC adc smpl 12bit 25msps 48tssop

LTC1745
Low Noise,12-Bit, 25Msps ADC
FEATURES
s
s
s
s
s
s
s
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DESCRIPTIO
Sample Rate: 25Msps
72.5dB SNR and 91dB SFDR (3.2V Range)
71dB SNR and 96dB SFDR (2V Range)
No Missing Codes
Single 5V Supply
Low Power Dissipation: 380mW
Selectable Input Ranges:
±1V
or
±1.6V
240MHz Full Power Bandwidth S/H
Pin Compatible Family
25 Msps: LTC1746 (14-Bit), LTC1745 (12-Bit)
50 Msps: LTC1744 (14-Bit), LTC1743 (12-Bit)
65 Msps: LTC1742 (14-Bit), LTC1741 (12-Bit)
80 Msps: LTC1748 (14-Bit), LTC1747 (12-Bit)
The LTC
®
1745 is a 25Msps, sampling 12-bit A/D con-
verter designed for digitizing high frequency, wide dy-
namic range signals. Pin selectable input ranges of
±1V
and
±1.6V
along with a resistor programmable mode
allow the LTC1745’s input range to be optimized for a wide
variety of applications.
The LTC1745 is perfect for demanding communications
applications with AC performance that includes 72.5dB
SNR and 91dB spurious free dynamic range. Ultralow jitter
of 0.3ps
RMS
allows undersampling with excellent noise
performance. DC specs include
±1LSB
INL maximum and
±0.75LSB
DNL over temperature.
The digital interface is compatible with 5V, 3V and 2V logic
systems. The ENC and ENC inputs may be driven differen-
tially from PECL, GTL and other low swing logic families or
from single-ended TTL or CMOS. The low noise, high gain
ENC and ENC inputs may also be driven by a sinusoidal
signal without degrading performance. A separate digital
output power supply can be operated from 0.5V to 5V,
making it easy to connect directly to low voltage DSPs
or FIFOs.
The TSSOP package with a flow-through pinout simplifies
the board layout.
APPLICATIO S
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Telecommunications
Medical Imaging
Receivers
Base Stations
Spectrum Analysis
Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
BLOCK DIAGRA
A
IN
±1V
DIFFERENTIAL
ANALOG INPUT
+
25Msps, 12-Bit ADC with a
±1V
Differential Input Range
OV
DD
OF
D11
D0
CLKOUT
0.1µF
0.5V TO 5V
0.1µF
A
IN–
S/H
AMP
12-BIT
PIPELINED ADC
12
SENSE
BUFFER
RANGE
SELECT
DIFF AMP
GND
CONTROL LOGIC
1745 BD
V
CM
4.7µF
2.35V
REF
REFLB
0.1µF
1µF
REFHA
4.7µF
REFLA
REFHB
ENC
ENC
0.1µF
1µF
DIFFERENTIAL
ENCODE INPUT
U
OUTPUT
LATCHES
OGND
V
DD
1µF
1µF
1µF
5V
MSBINV
OE
W
U
1745f
1

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Number of digits - - 12 12 12 12
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