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PDF LTC2145-14 Data sheet ( Hoja de datos )
| Número de pieza | LTC2145-14 | |
| Descripción | 80Msps Low Power Dual ADC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n Two-Channel Simultaneously Sampling ADC
n 73.1dB SNR
n 90dB SFDR
n Low Power: 189mW/149mW/113mW Total
95mW/75mW/57mW per Channel
n Single 1.8V Supply
n CMOS, DDR CMOS, or DDR LVDS Outputs
n Selectable Input Ranges: 1VP-P to 2VP-P
n 750MHz Full Power Bandwidth S/H
n Optional Data Output Randomizer
n Optional Clock Duty Cycle Stabilizer
n Shutdown and Nap Modes
n Serial SPI Port for Configuration
n 64-Pin (9mm × 9mm) QFN Package
Applications
n Communications
n Cellular Base Stations
n Software Defined Radios
n Portable Medical Imaging
n Multi-Channel Data Acquisition
n Nondestructive Testing
LTC2145-14/
LTC2144-14/LTC2143-14
14-Bit, 125Msps/105Msps/
80Msps Low Power Dual ADCs
Description
The LTC®2145-14/LTC2144-14/LTC2143-14 are 2-channel
simultaneous sampling 14-bit A/D converters designed
for digitizing high frequency, wide dynamic range signals.
They are perfect for demanding communications applica-
tions with AC performance that includes 73.1dB SNR and
90dB spurious free dynamic range (SFDR). Ultralow jitter
of 0.08psRMS allows undersampling of IF frequencies with
excellent noise performance.
DC specs include ±1LSB INL (typ), ±0.3LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 1.2LSBRMS.
The digital outputs can be either full rate CMOS, double
data rate CMOS, or double data rate LVDS. A separate
output power supply allows the CMOS output swing to
range from 1.2V to 1.8V.
The ENC+ and ENC– inputs may be driven differentially
or single-ended with a sine wave, PECL, LVDS, TTL, or
CMOS inputs. An optional clock duty cycle stabilizer al-
lows high performance at full speed for a wide range of
clock duty cycles.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
1.8V
VDD
CH 1
ANALOG
INPUT
S/H
14-BIT
ADC CORE
CH 2
ANALOG
INPUT
125MHz
CLOCK
S/H
14-BIT
ADC CORE
CLOCK
CONTROL
GND
1.8V
OVDD
OUTPUT
DRIVERS
D1_13
•••
D1_0
D2_13
•••
D2_0
CMOS,
DDR CMOS
OR DDR LVDS
OUTPUTS
OGND
21454314 TA01a
64k 7P0oMinHt z2,-T–o1ndeBFFSFT,,1fI2N5=M6s9pMs Hz,
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
21454314 TA03b
21454314f
1
1 page  
LTC2145-14/
LTC2144-14/LTC2143-14
Dynamic Accuracy The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. AIN = –1dBFS. (Note 5)
LTC2145-14
LTC2144-14
LTC2143-14
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
SNR Signal-to-Noise Ratio
5MHz Input
70MHz Input
140MHz Input
l 71.4
73.1
73
72.6
72.9
71.2 72.8
72.4
73.4
71.7 73.3
72.9
dBFS
dBFS
dBFS
SFDR
Spurious Free Dynamic Range 5MHz Input
2nd Harmonic
70MHz Input
140MHz Input
l 76
90
89
84
90
77 89
84
90
78 89
84
dBFS
dBFS
dBFS
Spurious Free Dynamic Range 5MHz Input
3rd Harmonic
70MHz Input
140MHz Input
l 79
90
89
84
90
79 89
84
90
81 89
84
dBFS
dBFS
dBFS
Spurious Free Dynamic Range 5MHz Input
4th Harmonic or Higher
70MHz Input
140MHz Input
l 86
95
95
95
95
86 95
95
95
86 95
95
dBFS
dBFS
dBFS
S/(N+D) Signal-to-Noise Plus
Distortion Ratio
5MHz Input
70MHz Input
140MHz Input
l 70.8
73
72.8
72.2
72.8
70.8 72.6
72
73.2
71.4 73.1
72.4
dBFS
dBFS
dBFS
Crosstalk
10MHz Input
–110 –110 –110 dBc
I nternal Reference Characteristics The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C. (Note 5)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCM Output Voltage
VCM Output Temperature Drift
VCM Output Resistance
VREF Output Voltage
VREF Output Temperature Drift
IOUT = 0
–600µA < IOUT < 1mA
IOUT = 0
0.5 • VDD – 25mV
1.225
0.5 • VDD
±25
4
1.250
±25
0.5 • VDD + 25mV
1.275
V
ppm/°C
Ω
V
ppm/°C
VREF Output Resistance
VREF Line Regulation
–400µA < IOUT < 1mA
1.7V < VDD < 1.9V
7Ω
0.6 mV/V
21454314f
5
5 Page 
LTC2145-14/
LTC2144-14/LTC2143-14
Typical Performance Characteristics
LTC2145-14: Integral
Nonlinearity (INL)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
4096
8192
12288
OUTPUT CODE
16384
21454314 G01
LTC2145-14: Differential
Nonlinearity (DNL)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
4096
8192
12288
OUTPUT CODE
16384
21454314 G02
LTC2145-14: 64k Point FFT,
fIN = 5MHz, –1dBFS, 125Msps
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
21454314 G03
LTC2145-14: 64k Point FFT,
fIN = 30MHz, –1dBFS, 125Msps
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
21454314 G04
LTC2145-14: 64k Point 2-Tone
–F1FTd,BfFINS=,
69MHz, 70MHz,
125Msps
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
21454314 G07
LTC2145-14: 64k Point FFT,
fIN = 70MHz, –1dBFS, 125Msps
0 16384
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
21454314 G05
LTC2145-14: Shorted Input
Histogram
6000
5000
4000
3000
2000
1000
0
8183
8185 8187 8189
OUTPUT CODE
8191
21454314 G08
LTC2145-14: 64k Point FFT,
fIN = 140MHz, –1dBFS, 125Msps
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
21454314 G06
LTC2145-14: SNR vs Input
Frequency, –1dBFS, 125Msps,
2V Range
74
73 SINGLE-ENDED
ENCODE
72 DIFFERENTIAL
ENCODE
71
70
0
50 100 150 200 250 300
INPUT FREQUENCY (MHz) 21454314 G09
21454314f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC2145-14.PDF ] | |
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