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LTC1747 PDF даташит

Спецификация LTC1747 изготовлена ​​​​«Linear Technology» и имеет функцию, называемую «12-Bit 80Msps Low Noise ADC».

Детали детали

Номер произв LTC1747
Описание 12-Bit 80Msps Low Noise ADC
Производители Linear Technology
логотип Linear Technology логотип 

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LTC1747 Даташит, Описание, Даташиты
FEATURES
s Sample Rate: 80Msps
s 72dB SNR and 85dB SFDR (3.2V Range)
s 70.5dB SNR and 87dB SFDR (2V Range)
s Pin Compatible with 14-Bit 80Msps LTC1748
s No Missing Codes
s Single 5V Supply
s Power Dissipation: 1.4W
s Selectable Input Ranges: ±1V or ±1.6V
s 240MHz 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 Cellular Base Stations
s Spectrum Analysis
s Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1747www.DataSheet4U.com
12-Bit, 80Msps Low Noise ADC
DESCRIPTIO
The LTC®1747 is an 80Msps, 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 LTC1747’s input range to be optimized for a wide
variety of applications.
The LTC1747 is perfect for demanding communications
applications with AC performance that includes 72dB
SNR and 85dB spurious free dynamic range. Ultralow jitter
of 0.15psRMS allows undersampling of IF frequencies with
excellent noise performance. DC specs include ±1.5 LSB
INL and ±0.8LSB DNL over temperature.
The digital interface is compatible with 5V, 3V, 2V and
LVDS logic systems. The ENC and ENC inputs may be
driven differentially 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
2.35VREF
80Msps, 12-Bit ADC with a 2V Differential Input Range
S/H
12-BIT
CORRECTION
LOGIC AND
12
OUTPUT
AMP
PIPELINED ADC
SHIFT
LATCHES
REGISTER
OVDD
0.1µF
OF
•••
D11
D0
CLKOUT
OGND
0.5V
TO 5V
0.1µF
BUFFER
DIFF AMP
CONTROL LOGIC
VDD
1µF
5V
1µF
1µF
GND
REFLB
0.1µF
1µF
REFHA
4.7µF
REFLA REFHB ENC ENC MSBINV
0.1µF DIFFERENTIAL
1µF ENCODE INPUT
1747 BD
OE
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LTC1747 Даташит, Описание, Даташиты
LTC1747
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
OVDD = VDD (Notes 1, 2)
Supply Voltage (VDD) ............................................. 5.5V
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
LTC1747C ............................................... 0°C to 70°C
LTC1747I ............................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
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
TOP VIEW
48 OF
47 OGND
46 D11
45 D10
44 D9
43 OVDD
42 D8
41 D7
40 D6
39 D5
38 OGND
37 GND
36 GND
35 D4
34 D3
33 D2
32 OVDD
31 D1
30 D0
29 NC
28 NC
27 OGND
26 CLKOUT
25 OE
ORDER PART
NUMBER
LTC1747CFW
LTC1747IFW
FW PACKAGE
48-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 35°C/W
Consult LTC Marketing 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 12
Bits
Integral Linearity Error
Differential Linearity Error
(Note 6)
– 1 ±0.4
q –1.5 ±0.6
q –0.8 ±0.2
1
1.5
0.8
LSB
LSB
LSB
Offset Error
Gain Error
Full-Scale Tempco
(Note 7)
External Reference (SENSE = 1.6V)
Internal Reference
External Reference (Sense = 1.6V)
– 35 ±8
35
mV
– 3.5 ±1
3.5
%FS
±40 ppm/°C
±20 ppm/°C
Offset Tempco
±20 µV/°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
VIN
IIN
CIN
PARAMETER
Analog Input Range (Note 8)
Analog Input Leakage Current
Analog Input Capacitance
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
CONDITIONS
4.75V VDD 5.25V
Sample Mode ENC < ENC
Hold Mode ENC > ENC
1.5V < (AIN– = AIN+) < 3V
MIN
q
q –1
q
TYP
±1 to ±1.6
8
4
5
0
0.15
80
MAX
1
6
UNITS
V
µA
pF
pF
ns
ns
psRMS
dB
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LTC1747 Даташит, Описание, Даташиты
LTC1747www.DataSheet4U.com
DY A IC ACCURACY Specifications are at TA = 25°C. AIN = –1dBFS. (Note 5)
SYMBOL
SNR
SFDR
S/(N + D)
THD
IMD
PARAMETER
Signal-to-Noise Ratio
Spurious Free Dynamic Range
Signal-to-(Noise + Distortion) Ratio
Total Harmonic Distortion
Intermodulation Distortion
Sample-and-Hold Bandwidth
CONDITIONS
5MHz Input Signal (2V Range)
5MHz Input Signal (3.2V Range)
30MHz Input Signal (2V Range)
30MHz Input Signal (3.2V Range)
70MHz Input Signal (2V Range)
70MHz Input Signal (3.2V Range)
140MHz Input Signal (2V Range)
250MHz Input Signal (2V Range)
5MHz Input Signal (2V Range)
5MHz Input Signal (3.2V Range) (2nd and 3rd)
5MHz Input Signal (3.2V Range) (Other)
30MHz Input Signal (2V Range)
30MHz Input Signal (3.2V Range) (2nd and 3rd)
30MHz Input Signal (3.2V Range) (Other)
70MHz Input Signal (2V Range)
70MHz Input Signal (3.2V Range) (2nd and 3rd)
70MHz Input Signal (3.2V Range) (Other)
140MHz Input Signal (2V Range) (2nd and 3rd)
140MHz Input Signal (2V Range) (Other)
250MHz Input Signal (2V Range) (2nd and 3rd)
250MHz Input Signal (2V Range) (Other)
5MHz Input Signal (2V Range)
5MHz Input Signal (3.2V Range)
30MHz Input Signal (2V Range)
30MHz Input Signal (3.2V Range)
70MHz Input Signal (2V Range)
70MHz Input Signal (3.2V Range)
5MHz Input Signal, First 5 Harmonics (2V Range)
5MHz Input Signal, First 5 Harmonics (3.2V Range)
30MHz Input Signal, First 5 Harmonics (2V Range)
30MHz Input Signal, First 5 Harmonics (3.2V Range)
70MHz Input Signal, First 5 Harmonics (2V Range)
70MHz Input Signal, First 5 Harmonics (3.2V Range)
fIN1 = 2.52MHz, fIN2 = 5.2MHz (2V Range)
fIN1 = 2.52MHz, fIN2 = 5.2MHz (3.2V Range)
RSOURCE = 50
MIN
71
71
84
77
84
84
71
UU
U
I TER AL REFERE CE CHARACTERISTICS (Note 5)
TYP MAX UNITS
70.5 dB
72 dB
70.5 dB
72 dB
70 dB
71.5 dB
69.3 dB
67.5 dB
87 dB
85 dB
92 dB
87 dB
85 dB
92 dB
84 dB
78 dB
90 dB
77 dB
90 dB
63 dB
87 dB
70.5 dB
72 dB
70.5 dB
72 dB
70 dB
71.5 dB
–85 dB
–84 dB
–85 dB
–84 dB
–81 dB
–77 dB
87 dBc
85 dBc
240 MHz
PARAMETER
VCM Output Voltage
VCM Output Tempco
VCM Line Regulation
VCM Output Resistance
CONDITIONS
IOUT = 0
IOUT = 0
4.75V VDD 5.25V
1mA ≤ IOUT ≤ 1mA
MIN TYP MAX UNITS
2.30 2.35 2.40
V
±30 ppm/°C
3 mV/V
4
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