ADC PWR-AVIS User Manual

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LTC2245
1
2245fa
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Sample Rate: 10Msps
Single 3V Supply (2.7V to 3.4V)
Low Power: 60mW
74.4dB SNR
90dB SFDR
No Missing Codes
Flexible Input: 1V
P-P
to 2V
P-P
Range
575MHz Full Power Bandwidth S/H
Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
Pin Compatible Family
125Msps: LTC2253 (12-Bit), LTC2255 (14-Bit)
105Msps: LTC2252 (12-Bit), LTC2254 (14-Bit)
80Msps: LTC2229 (12-Bit), LTC2249 (14-Bit)
65Msps: LTC2228 (12-Bit), LTC2248 (14-Bit)
40Msps: LTC2227 (12-Bit), LTC2247 (14-Bit)
25Msps: LTC2226 (12-Bit), LTC2246 (14-Bit)
10Msps: LTC2225 (12-Bit), LTC2245 (14-Bit)
32-Pin (5mm × 5mm) QFN Package
14-Bit, 10Msps
Low Power 3V ADC
The LTC
®
2245 is a 14-bit 10Msps, low power 3V A/D
converter designed for digitizing high frequency, wide
dynamic range signals. The LTC2245 is perfect for de-
manding imaging and communications applications with
AC performance that includes 74.4dB SNR and 90dB
SFDR for signals well beyond the Nyquist frequency.
DC specs include ±1LSB INL (typ), ±0.5LSB DNL (typ) and
no missing codes over temperature. The transition noise
is a low 1LSB
RMS
.
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.6V
logic.
A single-ended CLK input controls converter operation. An
optional clock duty cycle stabilizer allows high perfor-
mance at full speed for a wide range of clock duty cycles.
Typical INL, 2V Range
APPLICATIO S
U
Wireless and Wired Broadband Communication
Imaging Systems
Spectral Analysis
Portable Instrumentation
+
INPUT
S/H
CORRECTION
LOGIC
OUTPUT
DRIVERS
14-BIT
PIPELINED
ADC CORE
CLOCK/DUTY
CYCLE
CONTROL
FLEXIBLE
REFERENCE
D13
D0
CLK
REFH
REFL
ANALOG
INPUT
2245 TA01
OV
DD
OGND
CODE
0
–2.0
INL ERROR (LSB)
–1.0
–0.5
0
2.0
1.0
4096
8192
2245 G01
–1.5
1.5
0.5
12288
16384
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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Summary of Contents

Page 1 - TYPICAL APPLICATIO

LTC224512245faFEATURESDESCRIPTIOUTYPICAL APPLICATIOU Sample Rate: 10Msps Single 3V Supply (2.7V to 3.4V) Low Power: 60mW 74.4dB SNR 90dB SFDR No Missi

Page 2 - CO VERTER CHARACTERISTICS

LTC2245102245faAperture Delay TimeThe time from when CLK reaches mid-supply to the instantthat the input signal is held by the sample and hold circuit

Page 3

LTC2245112245faAPPLICATIO S I FOR ATIOWUUUhigh to low, the inputs are reconnected to the samplingcapacitors to acquire a new sample. Since the samplin

Page 4 - POWER REQUIRE E TS

LTC2245122245faAPPLICATIO S I FOR ATIOWUUUReference OperationFigure 6 shows the LTC2245 reference circuitry consistingof a 1.5V bandgap reference,

Page 5 - TI I G CHARACTERISTICS

LTC2245132245faAPPLICATIO S I FOR ATIOWUUUThe noise performance of the LTC2245 can depend on theclock signal quality as much as on the analog inpu

Page 6 - SFDR (dBc AND dBFS)

LTC2245142245faDIGITAL OUTPUTSTable 1 shows the relationship between the analog inputvoltage, the digital data bits, and the overflow bit.As with all

Page 7 - PI FU CTIO S

LTC2245152245faAPPLICATIO S I FOR ATIOWUUUOutput Driver PowerSeparate output power and ground pins allow the outputdrivers to be isolated from the

Page 8 - FUNCTIONAL BLOCK DIAGRA

LTC2245162245faAPPLICATIO S I FOR ATIOWUUU12C80.1µFC110.1µF345VDD7VDDVDDGND932VCM31302933JP2OE10118C72.2µFC61µFC91µFC40.1µFC212pFVDDVDDVDDGNDJP1SH

Page 9

LTC2245172245faAPPLICATIO S I FOR ATIOWUUUSilkscreen TopTopsideInner Layer 2 GND

Page 10 - APPLICATIO S I FOR ATIO

LTC2245182245faAPPLICATIO S I FOR ATIOWUUUInner Layer 3 PowerBottomsideSilkscreen Bottom

Page 11 - APPLICATIO S I FOR ATIO

LTC2245192245faUH Package32-Lead Plastic QFN (5mm × 5mm)(Reference LTC DWG # 05-08-1693)PACKAGE DESCRIPTIOUInformation furnished by Linear Technology

Page 12

LTC224522245faABSOLUTE AXI U RATI GSWWWUPACKAGE/ORDER I FOR ATIOUUWOVDD = VDD (Notes 1, 2)Supply Voltage (VDD) ...

Page 13

LTC2245202245faLinear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com© LINE

Page 14

LTC224532245faThe ● denotes the specifications which apply over the full operating temperature range,otherwise specifications are at TA = 25°C. AIN =

Page 15

LTC224542245faDIGITAL I PUTS A D DIGITAL OUTPUTSUUThe ● denotes the specifications which apply over thefull operating temperature range, otherwise

Page 16

LTC224552245faNote 1: Stresses beyond those listed under Absolute Maximum Ratingsmay cause permanent damage to the device. Exposure to any AbsoluteMax

Page 17

LTC224562245faTYPICAL PERFOR A CE CHARACTERISTICS UW8192 Point FFT, fIN = 70.1MHz,–1dB, 2V RangeGrounded Input HistogramSNR vs Input Frequency, –1

Page 18

LTC224572245faTYPICAL PERFOR A CE CHARACTERISTICS UWIOVDD vs Sample Rate, 5MHz SineWave Input, –1dB, OVDD = 1.8VIVDD vs Sample Rate,5MHz Sine Wave

Page 19 - UH Package

LTC224582245faSENSE (Pin 30): Reference Programming Pin. ConnectingSENSE to VCM selects the internal reference and a ±0.5Vinput range. VDD selects the

Page 20 - RELATED PARTS

LTC224592245faTI I G DIAGRAUWWDYNAMIC PERFORMANCESignal-to-Noise Plus Distortion RatioThe signal-to-noise plus distortion ratio [S/(N + D)] is the

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