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LTC1745CFW#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC1745
1745f
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
BLOCK DIAGRA
W
Low Noise,12-Bit, 25Msps ADC
■
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)
■
Telecommunications
■
Medical Imaging
■
Receivers
■
Base Stations
■
Spectrum Analysis
■
Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
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.
25Msps, 12-Bit ADC with a ±1V Differential Input Range
12-BIT
PIPELINED ADC
12
S/H
AMP
±1V
DIFFERENTIAL
ANALOG INPUT
A
IN
+
A
IN
–
SENSE
V
CM
4.7µF
DIFF AMP
REFLA REFHB
GND
1745 BD
ENC
4.7µF
1µF1µF
0.1µF 0.1µF
REFHAREFLB
BUFFER
RANGE
SELECT
2.35V
REF
OUTPUT
LATCHES
CONTROL LOGIC
OV
DD
V
DD
OGND
0.5V TO 5V
5V
0.1µF
1µF 1µF 1µF
D11
D0
CLKOUT
OF
•
•
•
ENC
DIFFERENTIAL
ENCODE INPUT
OEMSBINV
0.1µF
2
LTC1745
1745f
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 12 Bits
Integral Linearity Error (Note 6) ● –1 ±0.4 1 LSB
Differential Linearity Error ● –0.75 ±0.2 0.75 LSB
Offset Error (Note 7) ● –30 ±530 mV
Gain Error External Reference (SENSE = 1.6V) ● –2.5 ±1 2.5 %FS
Full-Scale Tempco I
OUT(REF)
= 0 ±40 ppm/°C
ORDER PART
NUMBER
OV
DD
= V
DD
(Notes 1, 2)
Supply Voltage (V
DD
)............................................. 5.5V
Analog Input Voltage (Note 3) .... –0.3V to (V
DD
+ 0.3V)
Digital Input Voltage (Note 4) ..... –0.3V to (V
DD
+ 0.3V)
Digital Output Voltage................. –0.3V to (V
DD
+ 0.3V)
OGND Voltage..............................................–0.3V to 1V
Power Dissipation............................................ 2000mW
Operating Temperature Range
LTC1745C ............................................... 0°C to 70°C
LTC1745I............................................ – 40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
LTC1745CFW
LTC1745IFW
T
JMAX
= 150°C, θ
JA
= 35°C/W
The ● indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
UU
CO VERTER CHARACTERISTICS
U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Input Range (Note 8) 4.75V ≤ V
DD
≤ 5.25V ● ±1 to ±1.6 V
I
IN
Analog Input Leakage Current ● –1 1 µA
C
IN
Analog Input Capacitance Sample Mode ENC < ENC 8 pF
Hold Mode ENC > ENC 4 pF
t
ACQ
Sample-and-Hold Acquisition Time ● 15 18 ns
t
AP
Sample-and-Hold Acquisition Delay Time 0 ns
t
JITTER
Sample-and-Hold Acquisition Delay Time Jitter 0.3 ps
RMS
CMRR Analog Input Common Mode Rejection Ratio 1.0V < (A
IN
–
= A
IN
+
) < 3.5V 80 dB
The ● indicates specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
A ALOG I PUT
UU
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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SENSE
V
CM
GND
A
IN
+
A
IN
–
GND
V
DD
V
DD
GND
REFLB
REFHA
GND
GND
REFLA
REFHB
GND
V
DD
V
DD
GND
V
DD
GND
MSBINV
ENC
ENC
OF
OGND
D11
D10
D9
OV
DD
D8
D7
D6
D5
OGND
GND
GND
D4
D3
D2
OV
DD
D1
D0
NC
NC
OGND
CLKOUT
OE
3
LTC1745
1745f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SNR Signal-to-Noise Ratio 5MHz Input Signal (2V Range) 71 dBFS
5MHz Input Signal (3.2V Range)
● 71 72.5 dBFS
30MHz Input Signal (2V Range) 71 dBFS
30MHz Input Signal (3.2V Range) 72 dBFS
70MHz Input Signal (2V Range) 70 dBFS
70MHz Input Signal (3.2V Range) 71.5 dBFS
SFDR Spurious Free Dynamic Range 5MHz Input Signal (2V Range) 96 dB
5MHz Input Signal (3.2V Range)
● 78 91 dB
30MHz Input Signal (2V Range) 93.5 dB
30MHz Input Signal (3.2V Range) 87 dB
70MHz Input Signal (2V Range) 79 dB
70MHz Input Signal (3.2V Range) 70.5 dB
S/(N + D) Signal-to-(Noise + Distortion) Ratio 5MHz Input Signal (2V Range) 71 dBFS
5MHz Input Signal (3.2V Range)
● 71 72.5 dBFS
30MHz Input Signal (2V Range) 71 dBFS
30MHz Input Signal (3.2V Range) 72 dBFS
70MHz Input Signal (2V Range) 69.5 dBFS
70MHz Input Signal (3.2V Range) 68.5 dBFS
THD Total Harmonic Distortion 5MHz Input Signal, First 5 Harmonics (2V Range) –92 dB
5MHz Input Signal, First 5 Harmonics (3.2V Range) –90 dB
30MHz Input Signal, First 5 Harmonics (2V Range) –91.5 dB
30MHz Input Signal, First 5 Harmonics (3.2V Range) –86.5 dB
70MHz Input Signal, First 5 Harmonics (2V Range) –77.5 dB
70MHz Input Signal, First 5 Harmonics (3.2V Range) –70 dB
IMD Intermodulation Distortion f
IN1
= 4MHz, f
IN2
= 5.1MHz (2V Range) 85 dBc
f
IN1
= 4MHz, f
IN2
= 5.1MHz (3.2V Range) 84 dBc
Sample-and-Hold Bandwidth R
SOURCE
= 50Ω 240 MHz
The ● indicates specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. A
IN
= –1dBFS. (Note 5)
DY A IC ACCURACY
UW
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CM
Output Voltage I
OUT
= 0 2.29 2.35 2.41 V
V
CM
Output Tempco I
OUT
= 0 ±30 ppm/°C
V
CM
Line Regulation 4.75V ≤ V
DD
≤ 5.25V 3 mV/V
V
CM
Output Resistance 1mA ≤ I
OUT
≤ 1mA 4 Ω
(Note 5)
I TER AL REFERE CE CHARACTERISTICS
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P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC1745CFW#TRPBF

Mfr. #:
Buy LTC1745CFW#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-bit, 25Msps Low Power ADC
Lifecycle:
New from this manufacturer.
Delivery:
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