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LTC1747CFW#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC1747
1747fa
BLOCK DIAGRA
W
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
12-Bit, 80Msps Low Noise ADC
■
Sample Rate: 80Msps
■
72dB SNR and 85dB SFDR (3.2V Range)
■
70.5dB SNR and 87dB SFDR (2V Range)
■
Pin Compatible with 14-Bit 80Msps LTC1748
■
No Missing Codes
■
Single 5V Supply
■
Power Dissipation: 1.4W
■
Selectable Input Ranges: ±1V or ±1.6V
■
240MHz Full Power Bandwidth S/H
■
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)
■
48-Pin TSSOP Package
■
Telecommunications
■
Receivers
■
Cellular Base Stations
■
Spectrum Analysis
■
Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
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 0.15ps
RMS
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.
80Msps, 12-Bit ADC with a 2V 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
1747 BD
ENC
4.7µF
1µF1µF
0.1µF 0.1µF
REFHAREFLB
BUFFER
RANGE
SELECT
2.35V
REF
CORRECTION
LOGIC AND
SHIFT
REGISTER
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
LTC1747
1747fa
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 12 Bits
Integral Linearity Error (Note 6) – 1 ±0.4 1 LSB
● –1.5 ±0.6 1.5 LSB
Differential Linearity Error ● –0.8 ±0.2 0.8 LSB
Offset Error (Note 7) –35 ±835 mV
Gain Error External Reference (SENSE = 1.6V) –3.5 ±1 3.5 %FS
Full-Scale Tempco Internal Reference ±40 ppm/°C
External Reference (Sense = 1.6V) ±20 ppm/°C
Offset Tempco ±20 µV/°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
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
LTC1747CFW
LTC1747IFW
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
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PACKAGE/ORDER INFORMATION
W
U
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1
2
3
4
5
6
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9
10
11
12
13
14
15
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TOP VIEW
FW PACKAGE
48-LEAD PLASTIC TSSOP
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
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
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 ● 56ns
t
AP
Sample-and-Hold Acquisition Delay Time 0 ns
t
JITTER
Sample-and-Hold Acquisition Delay Time Jitter 0.15 ps
RMS
CMRR Analog Input Common Mode Rejection Ratio 1.5V < (A
IN
–
= A
IN
+
) < 3V 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.
3
LTC1747
1747fa
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CM
Output Voltage I
OUT
= 0 2.30 2.35 2.40 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
UU U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SNR Signal-to-Noise Ratio 5MHz Input Signal (2V Range) 70.5 dB
5MHz Input Signal (3.2V Range) 71 72 dB
30MHz Input Signal (2V Range) 70.5 dB
30MHz Input Signal (3.2V Range) 71 72 dB
70MHz Input Signal (2V Range) 70 dB
70MHz Input Signal (3.2V Range) 71.5 dB
140MHz Input Signal (2V Range) 69.3 dB
250MHz Input Signal (2V Range) 67.5 dB
SFDR Spurious Free Dynamic Range 5MHz Input Signal (2V Range) 87 dB
5MHz Input Signal (3.2V Range) (2nd and 3rd) 85 dB
5MHz Input Signal (3.2V Range) (Other) 84 92 dB
30MHz Input Signal (2V Range) 87 dB
30MHz Input Signal (3.2V Range) (2nd and 3rd) 77 85 dB
30MHz Input Signal (3.2V Range) (Other) 84 92 dB
70MHz Input Signal (2V Range) 84 dB
70MHz Input Signal (3.2V Range) (2nd and 3rd) 78 dB
70MHz Input Signal (3.2V Range) (Other) 84 90 dB
140MHz Input Signal (2V Range) (2nd and 3rd) 77 dB
140MHz Input Signal (2V Range) (Other) 90 dB
250MHz Input Signal (2V Range) (2nd and 3rd) 63 dB
250MHz Input Signal (2V Range) (Other) 87 dB
S/(N + D) Signal-to-(Noise + Distortion) Ratio 5MHz Input Signal (2V Range) 70.5 dB
5MHz Input Signal (3.2V Range) 71 72 dB
30MHz Input Signal (2V Range) 70.5 dB
30MHz Input Signal (3.2V Range) 72 dB
70MHz Input Signal (2V Range) 70 dB
70MHz Input Signal (3.2V Range) 71.5 dB
THD Total Harmonic Distortion 5MHz Input Signal, First 5 Harmonics (2V Range) –85 dB
5MHz Input Signal, First 5 Harmonics (3.2V Range) –84 dB
30MHz Input Signal, First 5 Harmonics (2V Range) –85 dB
30MHz Input Signal, First 5 Harmonics (3.2V Range) –84 dB
70MHz Input Signal, First 5 Harmonics (2V Range) –81 dB
70MHz Input Signal, First 5 Harmonics (3.2V Range) –77 dB
IMD Intermodulation Distortion f
IN1
= 2.52MHz, f
IN2
= 5.2MHz (2V Range) 87 dBc
f
IN1
= 2.52MHz, f
IN2
= 5.2MHz (3.2V Range) 85 dBc
Sample-and-Hold Bandwidth R
SOURCE
= 50Ω 240 MHz
Specifications are at T
A
= 25°C. A
IN
= –1dBFS. (Note 5)
DY A IC ACCURACY
UW
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC1747CFW#PBF

Mfr. #:
Buy LTC1747CFW#PBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-B, 80Msps L N ADC
Lifecycle:
New from this manufacturer.
Delivery:
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