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PDF LTC2273 Data sheet ( Hoja de datos )
| Número de pieza | LTC2273 | |
| Descripción | (LTC2272 / LTC2273) 80Msps/65Msps Serial Output ADC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
wwwn.daHtasigheheSt4pu.ecoemd Serial Interface (JESD204)
n Sample Rate: 80Msps/65Msps
n 77.7dBFS Noise Floor
n 100dB SFDR
n SFDR >90dB at 140MHz (1.5VP-P Input Range)
n PGA Front End (2.25VP-P or 1.5VP-P Input Range)
n 700MHz Full Power Bandwidth S/H
n Optional Internal Dither
n Single 3.3V Supply
n Power Dissipation: 1100mW/990mW
n Clock Duty Cycle Stabilizer
n Pin Compatible Family
105Msps: LTC2274
80Msps: LTC2273
65Msps: LTC2272
n 40-Pin 6mm × 6mm QFN Package
APPLICATIONS
n Telecommunications
n Receivers
n Cellular Base Stations
n Spectrum Analysis
n Imaging Systems
n ATE
LTC2273/LTC2272
16-Bit, 80Msps/65Msps
Serial Output ADC
DESCRIPTION
The LTC®2273/LTC2272 are 80Msps/65Msps, 16-bit A/D
converters with a high speed serial interface. They are
designed for digitizing high frequency, wide dynamic
range signals with an input bandwidth of 700MHz. The
input range of the ADC can be optimized using the PGA
front end. The output data is serialized according to the
JEDEC serial interface for data converters specification
(JESD204).
The LTC2273/LTC2272 are perfect for demanding applica-
tions where it is desirable to isolate the sensitive analog
circuits from the noisy digital logic. The AC performance
includes a 77.7dB Noise Floor and 100dB spurious free
dynamic range (SFDR). Ultra low internal jitter of 80fs
RMS allows undersampling of high input frequencies
with excellent noise performance. Maximum DC specs
include ±4.5LSB INL and ±1LSB DNL (no missing codes)
over temperature.
The encode clock inputs, ENC+ and ENC–, may be driven
differentially or single-ended with a sine wave, PECL,
LVDS, TTL or CMOS inputs. A clock duty cycle stabilizer
allows high performance at full speed with a wide range
of clock duty cycles.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
VCM
2.2μF
1.25V
COMMON MODE
BIAS VOLTAGE
3.3V
SENSE
INTERNAL ADC
REFERENCE
GENERATOR
FAM
8B/10B
ENCODER
16 20
SYNC+
SYNC–
OVDD 1.2V TO 3.3V
0.1μF
AIN +
ANALOG
INPUT
AIN –
CMLOUT+
+
S/H
AMP
–
CLOCK
16-BIT
PIPELINED
ADC CORE
CLOCK/DUTY
CYCLE
CONTROL
CORRECTION
LOGIC
SCRAMBLER/
PATTERN
GENERATOR
SERIALIZER
CMLOUT–
20X
PLL
3.3V
VDD
GND 0.1μF 0.1μF
ENC+ ENC– PGA DITH MSBINV SHDN
PAT1 PAT0 SCRAM SRR1 SRR0
ASIC OR FPGA
50Ω
50Ω
+
SERIAL
RECEIVER
–
22732 TA01
128k Point FFT, fIN = 4.93MHz,
–1dBFS, PGA = 0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
10 20 30
FREQUENCY (MHz)
40
22732 G04
22732f
1
1 page  
LTC2273/LTC2272
COMMON MODE BIAS CHARACTERISTICS The l denotes the specifications which apply over
the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCM Output Voltage
www.datasheet4u.com
VCM Output Tempco
VCM Line Regulation
VCM Output Resistance
IOUT = 0
IOUT = 0
3.135V ≤ VDD ≤ 3.465V
–1mA ≤ | IOUT | ≤ 1mA
1.15 1.25 1.35
V
l 40
ppm/°C
l1
mV/V
l2
Ω
DIGITAL INPUTS AND DIGITAL OUTPUTS The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
Encode Inputs (ENC+, ENC–)
CONDITIONS
MIN TYP MAX UNITS
VID
Differential Input Voltage
(Note 7)
VICM Common Mode Input Voltage Internally Set
Externally Set (Note 7)
l 0.2
1.6
1.4 3.0
V
V
RIN Input Resistance
(See Figure 2)
6 kΩ
CIN Input Capacitance
SYNC Inputs (SYNC+, SYNC–)
3
VSID SYNC Differential Input
Voltage
(Note 7)
l 0.2
VSICM
SYNC Common Mode Input Internally Set
Voltage
Externally Set (Note 7)
1.6
1.1 2.2
RSIN SYNC Input Resistance
16.5
CSIN SYNC Input Capacitance
3
Logic Inputs (DITH, PGA, MSBINV, SCRAM, FAM, SHDN, SRR1, SRR0, ISMODE, PAT1, PAT0)
pF
V
V
kΩ
pF
VIH
High Level Input Voltage
VDD = 3.3V
VIL
Low Level Input Voltage
VDD = 3.3V
l2
l
V
0.8 V
IIN Input Current
VIN = 0V to VDD
CIN Input Capacitance
High-Speed Serial Outputs (CMLOUT+, CMLOUT–)
l ±10 μA
1.5 pF
VOH Output High Level
VOL Output Low Level
VOCM
ROUT
Output Common Mode
Voltage
Output Resistance
Directly-Coupled 50Ω to OVDD
Directly-Coupled 100Ω Differential
AC-Coupled
Directly-Coupled 50Ω to OVDD
Directly-Coupled 100Ω Differential
AC-Coupled
Directly-Coupled 50Ω to OVDD
Directly-Coupled 100Ω Differential
AC-Coupled
Single-Ended Differential
OVDD
OVDD – 0.2
OVDD – 0.2
OVDD – 0.4
OVDD – 0.6
OVDD – 0.6
OVDD – 0.2
OVDD – 0.4
OVDD – 0.4
l 35 50 65
100
V
V
V
V
V
V
V
V
V
Ω
Ω
22732f
5
5 Page 
LTC2273/LTC2272
TYPICAL PERFORMANCE CHARACTERISTICS VDD = 3.3V, OVDD = 1.5V, TA = 25°C, FS = 65Msps,
unless otherwise noted.
LTC2272: Integral Non-Linearity
www.datashe(eINt4Lu).cvosmOutput Code
2.0
1.5
1.0
0.5
0.0
–0.5
–1.0
–1.5
–2.0
0
16384 32768 49152 65536
OUTPUT CODE
22732 G26
LTC2272: Differential Non-
Linearity (DNL) vs Output Code
1.0
0.8
0.6
0.4
0.2
0.0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384 32768 49152 65536
OUTPUT CODE
22732 G27
LTC2272: AC Grounded Input
Histogram
10000
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
32894
32904
32914
OUTPUT CODE
32924
22732 G28
LTC2272: 128k Point FFT,
fIN = 5.1MHz, –1dBFS, PGA = 0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
10 20 30
FREQUENCY (MHz)
22732 G29
LTC2272: SFDR vs Input Level,
fIN = 15MHz, PGA = 0,
Dither “Off”
140
130
120
110
100
90
80
70
60
50
40
30
–80 –70 –60 –50 –40 –30 –20 –10 0
INPUT LEVEL (dBFS)
22732 G32
LTC2272: 64k Point FFT,
fIN = 14.8MHz, –1dBFS, PGA = 0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
10 20 30
FREQUENCY (MHz)
22732 G30
LTC2272: SFDR vs Input Level,
fIN = 15MHz, PGA = 0,
Dither “On”
140
130
120
110
100
90
80
70
60
50
40
30
–80 –70 –60 –50 –40 –30 –20 –10 0
INPUT LEVEL (dBFS)
22732 G33
LTC2272: 64k Point FFT,
fIN = 14.8MHz, –10dBFS, PGA = 0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
10 20 30
FREQUENCY (MHz)
22732 G31
LTC2272: 64k Point 2-Tone FFT,
fIN = 14.01MHz and 15.8MHz,
–7dBFS, PGA = 0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
10 20 30
FREQUENCY (MHz)
22732 G34
22732f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC2273.PDF ] | |
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