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PDF LTC2185 Data sheet ( Hoja de datos )
| Número de pieza | LTC2185 | |
| Descripción | 16-Bit 125/105/80Msps Low Power Dual ADCs | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n Two-Channel Simultaneously Sampling ADC
n 76.8dB SNR
n 90dB SFDR
n Low Power: 370mW/308mW/200mW Total
185mW/154mW/100mW 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 550MHz 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
LTC2185/LTC2184/LTC2183
16-Bit, 125/105/80Msps
Low Power Dual ADCs
Description
The LTC®2185/LTC2184/LTC2183 are two-channel si-
multaneous sampling 16-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 76.8dB SNR and
90dB spurious free dynamic range (SFDR). Ultralow jitter
of 0.07psRMS allows undersampling of IF frequencies with
excellent noise performance.
DC specs include ±2LSB INL (typ), ±0.5LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 3.4LSBRMS.
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
16-BIT
ADC CORE
CH 2
wwwAN.INADLPaOUtGTaSheet4U.Sc/oHm
16-BIT
ADC CORE
125MHz
CLOCK
CLOCK
CONTROL
GND
1.8V
OVDD
OUTPUT
DRIVERS
D1_15
•••
D1_0
D2_15
••
•
D2_0
CMOS,
DDR CMOS
OR DDR LVDS
OUTPUTS
OGND
218543 TA01a
2-Tone FFT, fIN = 70MHz and 69MHz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
218543 TA01b
218543f
1
1 page  
LTC2185/LTC2184/LTC2183
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)
LTC2185
LTC2184
LTC2183
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 74.8
76.8
76.6
76.1
76.7
74.8 76.5
76
77.1
75.1 76.9
76.4
dBFS
dBFS
dBFS
SFDR
Spurious Free Dynamic Range 5MHz Input
2nd Harmonic
70MHz Input
140MHz Input
l 79
90
89
84
90
81 89
84
90
81 89
84
dBFS
dBFS
dBFS
Spurious Free Dynamic Range 5MHz Input
3rd Harmonic
70MHz Input
140MHz Input
l 82
90
89
84
90
81 89
84
90
82 89
84
dBFS
dBFS
dBFS
Spurious Free Dynamic Range 5MHz Input
4th Harmonic or Higher
70MHz Input
140MHz Input
l 89
95
95
95
95
89 95
95
95
89 95
95
dBFS
dBFS
dBFS
S/(N+D) Signal-to-Noise Plus
Distortion Ratio
5MHz Input
70MHz Input
140MHz Input
l 73.3
76.6
76.2
75.1
76.5
73.9 76.1
75
76.9
74.4 76.5
75.3
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
VREF Output Resistance
IOUT = 0
–600µA < IOUT < 1mA
IOUT = 0
–400µA < IOUT < 1mA
0.5 • VDD – 25mV
1.225
0.5 • VDD
±25
4
1.250
±25
7
0.5 • VDD + 25mV
1.275
V
ppm/°C
Ω
V
ppm/°C
Ω
VREF Line Regulation
1.7V < VDD < 1.9V
0.6 mV/V
www.DataSheet4U.com
218543f
5
5 Page 
LTC2185/LTC2184/LTC2183
Typical Performance Characteristics
LTC2185: Integral
Non-Linearity (INL)
4.0
3.0
2.0
1.0
0
–1.0
–2.0
–3.0
–4.0
0
16384 32768 49152 65536
OUTPUT CODE
218543 G01
LTC2185: Differential
Non-Linearity (DNL)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384 32768 49152 65536
OUTPUT CODE
218543 G02
LTC2185: 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)
218543 G04
LTC2185: 64k Point 2-Tone FFT,
1fI2N5=M6s9pMsHz, 70MHz, –7dBFS,
0
–10
–20
–30
–40
–50
–60
–70
www.D–a80taSheet4U.com
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
218543 G07
LTC2185: 64k Point FFT,
fIN = 70MHz, –1dBFS, 125Msps
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
218543 G05
LTC2185: Shorted Input Histogram
10000
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
32750
32756 32762 32768
OUTPUT CODE
32774
218543 G08
LTC2185: 64k Point
–1dBFS, 125Msps
FFT,
fIN
=
5MHz,
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
218543 G03
LTC2185: 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)
218543 G06
LTC2185: SNR vs Input Frequency,
–1dBFS, 125Msps, 2V Range
78
77 SINGLE-ENDED
ENCODE
76
75
74 DIFFERENTIAL
ENCODE
73
72
71
70
0 50 100 150 200 250 300
INPUT FREQUENCY (MHz)
218543 G09
218543f
11
11 Page | ||
| Páginas | Total 36 Páginas | |
| PDF Descargar | [ Datasheet LTC2185.PDF ] | |
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