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Linear Technology Electronic Components Datasheet

LTC2271IUKG Datasheet

20Msps Serial Low Noise Dual ADC

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FEATURES
n 2-Channel Simultaneous Sampling ADC
n Serial LVDS Outputs: 1, 2 or 4 Bits per Channel
n 84.1dB SNR (46μVRMS Input Referred Noise)
n 99dB SFDR
n Low Power: 185mW Total
n 92mW per Channel
n Single 1.8V Supply
n Selectable Input Ranges: 1VP-P to 2.1VP-P
n 200MHz Full-Power Bandwidth S/H
n Shutdown and Nap Modes
n Serial SPI Port for Configuration
n Pin Compatible With
LTC2190: 16-Bit, 25Msps, 104mW
n 52-Lead (7mm × 8mm) QFN Package
APPLICATIONS
n Low Power Instrumentation
n Software-Defined Radios
n Portable Medical Imaging
n Multi-Channel Data Acquisition
LTC2271
16-Bit, 20Msps
Serial Low Noise Dual ADC
DESCRIPTION
The LTC®2271 is a 2-channel, simultaneous sampling
16-bit A/D converter designed for digitizing high frequency,
wide dynamic range signals. It is perfect for demanding
communications applications with AC performance that
includes 84.1dB SNR and 99dB spurious free dynamic
range (SFDR).
DC specs include ±1LSB INL (typ), ±0.2LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 1.44LSBRMS.
To minimize the number of data lines the digital outputs
are serial LVDS. Each channel outputs one bit, two bits or
four bits at a time. 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 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
CH1
ANALOG
S/H
INPUT
CH2
ANALOG
S/H
INPUT
ENCODE
INPUT
1.8V
VDD
16-BIT
ADC CORE
16-BIT
ADC CORE
PLL
GND
1.8V
OVDD
DATA
SERIALIZER
OGND
2271 TA01
OUT1A
OUT1B
OUT1C
OUT1D
OUT2A
OUT2B
OUT2C
OUT2D
DATA CLOCK OUT
FRAME
SERIALIZED
LVDS
OUTPUTS
Integral Non-Linearity (INL)
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
2271 TA02
2271f
1


Linear Technology Electronic Components Datasheet

LTC2271IUKG Datasheet

20Msps Serial Low Noise Dual ADC

No Preview Available !

LTC2271
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
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
LTC2271C ................................................ 0°C to 70°C
LTC2271I.............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
VCM1 1
GND 2
AIN1+ 3
AIN1– 4
GND 5
REFH 6
52 51 50 49 48 47 46 45 44 43 42 41
40 OUT1C+
39 OUT1C
38 OUT1D+
37 OUT1D
36 DCO+
35 DCO
REFL 7
53
34 OVDD
REFH 8
GND
33 OGND
REFL 9
32 FR+
PAR/SER 10
31 FR–
AIN2+ 11
AIN2– 12
GND 13
30 OUT2A+
29 OUT2A
28 OUT2B+
VCM2 14
27 OUT2B
15 16 17 18 19 20 21 22 23 24 25 26
UKG PACKAGE
52-LEAD (7mm s 8mm) PLASTIC QFN
TJMAX = 150°C, θJA = 29°C/W
EXPOSED PAD (PIN 53) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2271CUKG#PBF
LTC2271CUKG#TRPBF LTC2271UKG
52-Lead (7mm × 8mm) Plastic QFN
0°C to 70°C
LTC2271IUKG#PBF
LTC2271IUKG#TRPBF LTC2271UKG
52-Lead (7mm × 8mm) 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/
2271f
2


Part Number LTC2271IUKG
Description 20Msps Serial Low Noise Dual ADC
Maker Linear Technology
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