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LTC1745CFW#PBF

Description
IC ADC 12BIT 25MSPS LN 48TSSOP
CategoryAnalog mixed-signal IC    converter   
File Size232KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LTC1745CFW#PBF Overview

IC ADC 12BIT 25MSPS LN 48TSSOP

LTC1745CFW#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeTSSOP
package instructionTSSOP, TSSOP48,.3,20
Contacts48
Manufacturer packaging codeFW
Reach Compliance Codecompliant
ECCN code3A991.C.2
Is SamacsysN
Maximum analog input voltage1.6 V
Minimum analog input voltage-1.6 V
Converter typeADC, PROPRIETARY METHOD
JESD-30 codeR-PDSO-G48
JESD-609 codee3
length12.5 mm
Maximum linear error (EL)0.0244%
Humidity sensitivity level1
Number of analog input channels1
Number of digits12
Number of functions1
Number of terminals48
Maximum operating temperature70 °C
Minimum operating temperature
Output bit codeOFFSET BINARY, 2'S COMPLEMENT BINARY
Output formatPARALLEL, WORD
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Encapsulate equivalent codeTSSOP48,.3,20
Package shapeRECTANGULAR
Package formSMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)250
power supply5 V
Certification statusNot Qualified
Sampling rate25 MHz
Sample and hold/Track and holdSAMPLE
Maximum seat height1.2 mm
Nominal supply voltage5 V
surface mountYES
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature40
width6.1 mm
Base Number Matches1
LTC1745
Low Noise,12-Bit, 25Msps ADC
FEATURES
s
s
s
s
s
s
s
s
s
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
s
s
s
s
s
s
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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