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Linear Technology Electronic Components Datasheet

LTC2157CUP-12 Datasheet

Dual 12-Bit 250Msps/210Msps/170Msps ADCs

No Preview Available !

FEATURES
n 68.5dB SNR
n 90dB SFDR
n Low Power: 628mW/592mW/545mW Total
n Single 1.8V Supply
n DDR LVDS Outputs
n Easy-to-Drive 1.5VP-P Input Range
n 1.25GHz Full-Power Bandwidth S/H
n Optional Clock Duty Cycle Stabilizer
n Low Power Sleep and Nap Modes
n Serial SPI Port for Configuration
n Pin Compatible 14-Bit Versions
n 64-Lead (9mm × 9mm) QFN Package
APPLICATIONS
n Communications
n Cellular Basestations
n Software Defined Radios
n Medical Imaging
n High Definition Video
n Testing and Measurement Instruments
LTC2157-12/
LTC2156-12/LTC2155-12
Dual 12-Bit 250Msps/
210Msps/170Msps ADCs
DESCRIPTION
The LTC®2157-12/LTC2156-12/LTC2155-12 are a family of
dual 250Msps/210Msps/170Msps 12-bit A/D converters
designed for digitizing high frequency, wide dynamic range
signals. They are perfect for demanding communications
applications with AC performance that includes 68.5dB
SNR and 90dB spurious free dynamic range (SFDR). The
1.25GHz input bandwidth allows the ADC to achieve high
undersampling ratio with very low attenuation. The latency
is only six clock cycles.
DC specs include ±0.26LSB INL (typ), ±0.16LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 0.54LSBRMS.
The digital outputs are double data rate (DDR) LVDS.
The ENC+ and ENCinputs can be driven differentially with
a sine wave, PECL, LVDS, TTL, or CMOS inputs. An optional
clock duty cycle stabilizer allows 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
ANALOG
INPUT
S/H
VDD
CHANNEL A
12-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
CLOCK
CLOCK/DUTY
CYCLE
CONTROL
ANALOG
INPUT
S/H
CHANNEL B
12-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
GND
OUTPUT
DRIVERS
OVDD
DA10_11
DA0_1
DDR
LVDS
OGND
OVDD
OUTPUT
DRIVERS
DB10_11
DB0_1
DDR
LVDS
21576512 TA01
OGND
LTC2157-12: 32K Points 2-Tone FFT,
fIN = 71MHZ and 69MHz, 250Msps
0
–20
–40
–60
–80
–100
–120
0
20 40 60 80 100 120
FREQUENCY (MHz)
21576512 G11
For more information www.linear.com/LTC2157-12
21576512fb
1


Linear Technology Electronic Components Datasheet

LTC2157CUP-12 Datasheet

Dual 12-Bit 250Msps/210Msps/170Msps ADCs

No Preview Available !

LTC2157-12/
LTC2156-12/LTC2155-12
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage
VDD, OVDD................................................. –0.3V to 2V
Analog Input Voltage
AINA/B+, AINA/B–, PAR/SER,
SENSE (Note 3)......................... –0.3V to (VDD + 0.2V)
Digital Input Voltage
ENC+, ENC(Note 3)................. –0.3V to (VDD + 0.3V)
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
LTC2157C, LTC2156C, LTC2155C............. 0°C to 70°C
LTC2157I, LTC2156I, LTC2155I.............–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
VDD 1
VDD 2
GND 3
AINA+ 4
AINA– 5
GND 6
SENSE 7
VREF 8
65
GND 9
GND
VCM 10
GND 11
AINB– 12
AINB+ 13
GND 14
VDD 15
VDD 16
48 OGND
47 DA2_3+
46 DA2_3
45 DA0_1+
44 DA0_1
43 NC
42 NC
41 CLKOUT+
40 CLKOUT
39 DB10_11+
38 DB10_11
37 DB8_9+
36 DB8_9
35 DB6_7+
34 DB6_7
33 OGND
UP PACKAGE
64-LEAD (9mm × 9mm) PLASTIC QFN
TJMAX = 150°C, θJA = 20°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2157CUP-12#PBF
LTC2157CUP-12#TRPBF LTC2157UP-12
64-Lead (9mm × 9mm) Plastic QFN
0°C to 70°C
LTC2157IUP-12#PBF
LTC2157IUP-12#TRPBF LTC2157UP-12
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 85°C
LTC2156CUP-12#PBF
LTC2156CUP-12#TRPBF LTC2156UP-12
64-Lead (9mm × 9mm) Plastic QFN
0°C to 70°C
LTC2156IUP-12#PBF
LTC2156IUP-12#TRPBF LTC2156UP-12
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 85°C
LTC2155CUP-12#PBF
LTC2155CUP-12#TRPBF LTC2155UP-12
64-Lead (9mm × 9mm) Plastic QFN
0°C to 70°C
LTC2155IUP-12#PBF
LTC2155IUP-12#TRPBF LTC2155UP-12
64-Lead (9mm × 9mm) 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.
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
For more information www.linear.com/LTC2157-12
21576512fb


Part Number LTC2157CUP-12
Description Dual 12-Bit 250Msps/210Msps/170Msps ADCs
Maker Linear
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LTC2157CUP-12 Datasheet PDF






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