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Linear Technology Electronic Components Datasheet

LTC2268-12 Datasheet

(LTC226x-12) 125Msps/105Msps/ 80Msps Low Power Dual ADCs

No Preview Available !

LTC2268-12 pdf
LTC2268-12/
LTC2267-12/LTC2266-12
12-Bit, 125Msps/105Msps/
80Msps Low Power Dual ADCs
FEATURES
n 2-Channel Simultaneous Sampling ADC
n 70.6dB SNR
n 88dB SFDR
n Low Power: 292mW/238mW/200mW Total,
146mW/119mW/100mW per Channel
n Single 1.8V Supply
n Serial LVDS Outputs: 1 or 2 Bits per Channel
n Selectable Input Ranges: 1VP-P to 2VP-P
n 800MHz Full Power Bandwidth S/H
n Shutdown and Nap Modes
n Serial SPI Port for Configuration
n Pin Compatible 14-Bit and 12-Bit Versions
n 40-Pin (6mm × 6mm) QFN Package
APPLICATIONS
n Communications
n Cellular Base Stations
n Software Defined Radios
n Portable Medical Imaging
n Multichannel Data Acquisition
n Nondestructive Testing
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.
DESCRIPTION
The LTC®2268-12/LTC2267-12/LTC2266-12 are 2-channel,
simultaneous sampling 12-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 70.6dB SNR and
88dB spurious free dynamic range (SFDR). Ultralow jitter
of 0.15psRMS allows undersampling of IF frequencies with
excellent noise performance.
DC specs include ±0.3LSB INL (typ), ±0.1LSB DNL (typ)
and no missing codes over temperature. The transition
noise is a low 0.3LSBRMS.
The digital outputs are serial LVDS to minimize the num-
ber of data lines. Each channel outputs two bits at a time
(2-lane mode). At lower sampling rates there is a one bit
per channel option (1-lane mode). The LVDS drivers have
optional internal termination and adjustable output levels
to ensure clean signal integrity.
The ENC+ and ENCinputs may be driven differentially
or single-ended with a sine wave, PECL, LVDS, TTL, or
CMOS inputs. An internal clock duty cycle stabilizer al-
lows high performance at full speed for a wide range of
clock duty cycles.
TYPICAL APPLICATION
1.8V
VDD
1.8V
OVDD
CH.1
ANALOG
INPUT
CH.2
ANALOG
INPUT
ENCODE
INPUT
S/H
S/H
12-BIT
ADC CORE
12-BIT
ADC CORE
PLL
DATA
SERIALIZER
OUT1A
OUT1B
OUT2A
OUT2B
DATA
CLOCK
OUT
FRAME
GND
OGND
226812 TA01
SERIALIZED
LVDS
OUTPUTS
LTC2268-12, 125Msps,
2-Tone FFT, fIN = 70MHz and 75MHz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
226812 TA01b
22687612f
1


Linear Technology Electronic Components Datasheet

LTC2268-12 Datasheet

(LTC226x-12) 125Msps/105Msps/ 80Msps Low Power Dual ADCs

No Preview Available !

LTC2268-12 pdf
LTC2268-12/
LTC2267-12/LTC2266-12
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltages
VDD, OVDD................................................ –0.3V to 2V
Analog Input Voltage (AIN+, AIN–,
PAR/SER, SENSE) (Note 3).............–0.3V to (VDD+0.2V)
Digital Input Voltage (ENC+, ENC, CS,
SDI, SCK) (Note 4).................................... –0.3V to 3.9V
SDO (Note 4) ............................................ –0.3V to 3.9V
Digital Output Voltage .................. –0.3V to (OVDD+0.3V)
Operating Temperature Range
LTC2268C, 2267C, 2266C........................ 0°C to 70°C
LTC2268I, 2267I, 2266I ....................... –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
AIN1+ 1
AIN1– 2
VCM1 3
REFH 4
40 39 38 37 36 35 34 33 32 31
30 OUT1B+
29 OUT1B
28 DCO+
27 DCO
REFH 5
REFL 6
41 26 OVDD
GND 25 OGND
REFL 7
24 FR+
VCM2 8
AIN2+ 9
AIN2– 10
23 FR
22 OUT2A+
21 OUT2A
11 12 13 14 15 16 17 18 19 20
UJ PACKAGE
40-LEAD (6mm × 6mm) PLASTIC QFN
TJMAX = 150°C, θJA = 32°C/W
EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2268CUJ-12#PBF
LTC2268CUJ-12#TRPBF LTC2268UJ-12
40-Lead (6mm × 6mm) Plastic QFN
0°C to 70°C
LTC2268IUJ-12#PBF
LTC2268IUJ-12#TRPBF LTC2268UJ-12
40-Lead (6mm × 6mm) Plastic QFN
–40°C to 85°C
LTC2267CUJ-12#PBF
LTC2267CUJ-12#TRPBF LTC2267UJ-12
40-Lead (6mm × 6mm) Plastic QFN
0°C to 70°C
LTC2267IUJ-12#PBF
LTC2267IUJ-12#TRPBF LTC2267UJ-12
40-Lead (6mm × 6mm) Plastic QFN
–40°C to 85°C
LTC2266CUJ-12#PBF
LTC2266CUJ-12#TRPBF LTC2266UJ-12
40-Lead (6mm × 6mm) Plastic QFN
0°C to 70°C
LTC2266IUJ-12#PBF
LTC2266IUJ-12#TRPBF LTC2266UJ-12
40-Lead (6mm × 6mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2
22687612f


Part Number LTC2268-12
Description (LTC226x-12) 125Msps/105Msps/ 80Msps Low Power Dual ADCs
Maker Linear Technology
Total Page 30 Pages
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