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Linear Technology Electronic Components Datasheet

LTC1744 Datasheet

14-Bit 50Msps ADC

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LTC1744 pdf
FEATURES
s Sample Rate: 50Msps
s 77dB SNR and 87dB SFDR (3.2V Range)
s 73.5dB SNR and 90dB SFDR (2V Range)
s No Missing Codes
s Single 5V Supply
s Power Dissipation: 1.2W
s Selectable Input Ranges: ±1V or ±1.6V
s 150MHz Full Power Bandwidth S/H
s Pin Compatible Family
25Msps: LTC1746 (14 Bit), LTC1745 (12 Bit)
50Msps: LTC1744 (14 Bit), LTC1743 (12 Bit)
65Msps: LTC1742 (14 Bit), LTC1741 (12 Bit)
80Msps: LTC1748 (14 Bit), LTC1747 (12 Bit)
s 48-Pin TSSOP Package
U
APPLICATIO S
s Telecommunications
s Receivers
s Base Stations
s Spectrum Analysis
s Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1744www.DataSheet4U.com
14-Bit, 50Msps ADC
DESCRIPTIO
The LTC®1744 is a 50Msps, sampling 14-bit A/D con-
verter designed for digitizing high frequency, wide dynamic
range signals. Pin selectable input ranges of±1V and ±1.6V
along with a resistor programmable mode allow the
LTC1744’s input range to be optimized for a wide variety
of applications.
The LTC1744 is perfect for demanding communications
applications with AC performance that includes 77dB
SNR and 87dB spurious free dynamic range. Ultralow jitter
of 0.3psRMS allows undersampling of IF frequencies with
excellent noise performance. DC specs include ±4LSB
maximum INL and no missing codes 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 output
power supply can be operated from 0.5V to 5V, making it
easy to connect directly to any low voltage DSPs or FIFOs.
The TSSOP package with a flow-through pinout simplifies
the board layout.
BLOCK DIAGRA
AIN+
±1V
DIFFERENTIAL
ANALOG INPUT AIN–
SENSE
RANGE
SELECT
VCM
4.7µF
2.5VREF
50Msps, 14-Bit ADC with a ±1V Differential Input Range
S/H
CIRCUIT
14-BIT
PIPELINED ADC
CORRECTION
LOGIC AND
14
OUTPUT
SHIFT
LATCHES
REGISTER
OVDD
0.1µF
OF
•••
D13
D0
CLKOUT
OGND
0.5V TO 5V
0.1µF
BUFFER
DIFF AMP
VDD
5V
1µF 1µF 1µF
CONTROL LOGIC
GND
REFLB REFHA
4.7µF
0.1µF
1µF
REFLA REFHB ENC ENC MSBINV
0.1µF
1µF
DIFFERENTIAL
ENCODE INPUT
1744 BD
OE
1744f
1


Linear Technology Electronic Components Datasheet

LTC1744 Datasheet

14-Bit 50Msps ADC

No Preview Available !

LTC1744 pdf
LTC1744
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
OVDD = VDD (Notes 1, 2)
Supply Voltage (VDD) ................................................ 6V
Analog Input Voltage (Note 3) .... – 0.3V to (VDD + 0.3V)
Digital Input Voltage (Note 4) ..... – 0.3V to (VDD + 0.3V)
Digital Output Voltage ................. – 0.3V to (VDD + 0.3V)
OGND Voltage ..............................................– 0.3V to 1V
Power Dissipation ............................................ 2000mW
Operating Temperature Range
LTC1744C ............................................... 0°C to 70°C
LTC1744I ............................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
SENSE 1
VCM 2
GND 3
AIN+ 4
AIN– 5
GND 6
VDD 7
VDD 8
GND 9
REFLB 10
REFHA 11
GND 12
GND 13
REFLA 14
REFHB 15
GND 16
VDD 17
VDD 18
GND 19
VDD 20
GND 21
MSBINV 22
ENC 23
ENC 24
48 OF
47 OGND
46 D13
45 D12
44 D11
43 OVDD
42 D10
41 D9
40 D8
39 D7
38 OGND
37 GND
36 GND
35 D6
34 D5
33 D4
32 OVDD
31 D3
30 D2
29 D1
28 D0
27 OGND
26 CLKOUT
25 OE
FW PACKAGE
48-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 35°C/W
ORDER PART
NUMBER
LTC1744CFW
LTC1744IFW
Consult factory for parts specified with wider operating temperature ranges.
CO VERTER CHARACTERISTICS The q indicates specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 5)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Resolution (No Missing Codes)
q 14
Bits
Integral Linearity Error
(Note 6)
q –4
±1
4
LSB
Differential Linearity Error
q –1 ±0.5 1.5
LSB
Offset Error
(Note 7)
– 20 ±5
20
mV
Gain Error
External Reference (SENSE = 1.6V)
–3 ±1
3
%FS
Full-Scale Tempco
IOUT(REF) = 0
±40 ppm/°C
A ALOG I PUT The q indicates specifications which apply over the full operating temperature range, otherwise
specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Analog Input Range (Note 8)
IIN Analog Input Leakage Current
CIN Analog Input Capacitance
4.75V VDD 5.25V
Sample Mode ENC < ENC
Hold Mode ENC > ENC
q ±1 to ±1.6
10
15
8
V
nA
pF
pF
tACQ
tAP
tJITTER
CMRR
Sample-and-Hold Acquisition Time
Sample-and-Hold Acquisition Delay Time
Sample-and-Hold Acquisition Delay Time Jitter
Analog Input Common Mode Rejection Ratio
1.0V < (AIN– = AIN+) < 3.5V
q
7.5 9.5
ns
0 ns
0.3 psRMS
80 dB
1744f
2


Part Number LTC1744
Description 14-Bit 50Msps ADC
Maker Linear Technology
Total Page 24 Pages
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