FEATURES
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LTC2205/LTC2204 16-Bit, 65Msps/40Msps ADCs DESCRIPTIO
The LTC®2205/LTC2204 are sampling 16-bit A/D converters designed for digitizing high frequency, wide dynamic range signals up to input frequencies of 700MHz. The input range of the ADC can be optimized with the PGA front end. The LTC2205/LTC2204 are perfect for demanding communications applications, with AC performance that includes 79dB SNR and 100dB spurious free dynamic range (SFDR). Ultralow jitter of 90fsRMS allows undersampling of high input frequencies with excellent noise performance. Maximum DC specs include ±4LSB INL, ±1LSB DNL (no missing codes). A separate output power supply allows the CMOS output swing to range from 0.5V to 3.6V. The ENC+ and ENC– inputs may be driven differentially or single-ended with a sine wave, PECL, LVDS, TTL or CMOS inputs. An optional clock duty cycle stabilizer allows high performance at full speed with a wide range of clock duty cycles.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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Sample Rate: 65Msps/40Msps 79dB SNR and 100dB SFDR (2.25VP-P Range) SFDR >92dB at 140MHz (1.5VP-P Input Range) PGA Front End (2.25VP-P or 1.5VP-P Input Range) 700MHz Full Power Bandwidth S/H Optional Internal Dither Optional Data Output Randomizer Single 3.3V Supply Power Dissipation: 610mW/480mW Optional Clock Duty Cycle Stabilizer Out-of-Range Indicator Pin Compatible Family 105Msps: LTC2207 (16-Bit), LTC2207-14 (14-Bit) 80Msps: LTC2206 (16-Bit), LTC2206-14 (14-Bit) 65Msps: LTC2205 (16-Bit), LTC2205-14 (14-Bit) 40Msps: LTC2204 (16-Bit) 48-Pin (7mm × 7mm) QFN Package
APPLICATIO S
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Telecommunications Receivers Cellular Base Stations Spectrum Analysis Imaging Systems ATE
TYPICAL APPLICATIO
3.3V SENSE VCM 2.2µF AIN+ ANALOG INPUT AIN– 1.25V COMMON MODE BIAS VOLTAGE INTERNAL ADC REFERENCE GENERATOR
OVDD
0.5V TO 3.6V 0.1µF OF CLKOUT D15 • • • D0 0 –20 AMPLITUDE (dBFS) –40 –60 –80 –100 –120 –140 0
+
S/H AMP
–
16-BIT PIPELINED ADC CORE
CORRECTION LOGIC AND SHIFT REGISTER
OUTPUT DRIVERS
OGND CLOCK/DUTY CYCLE CONTROL VDD GND ENC ENC PGA SHDN DITH MODE OE RAND 0.1µF 0.1µF 3.3V 0.1µF
22076 TA01
ADC CONTROL INPUTS
U
U
U
LTC2205: 64K Point FFT, fIN = 5.1MHz, –1dBFS, PGA = 0, DITH = 0
5
20 15 25 10 FREQUENCY (MHz)
30
22054 TA01b
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1
LTC2205/LTC2204 ABSOLUTE MAXIMUM RATINGS
OVDD = VDD (Notes 1 and 2)
PIN CONFIGURATION
48 GND 47 PGA 46 RAND 45 MODE 44 OE 43 OF 42 D15 41 D14 40 D13 39 D12 38 OGND 37 OVDD SENSE 1 VCM 2 VDD 3 VDD 4 GND 5 AIN+ 6 AIN– 7 GND 8 ENC+ 9 ENC– 10 GND 11 VDD 12 49 36 OVDD 35 D11 34 D10 33 D9 32 D8 31 OGND 30 CLKOUT+ 29 CLKOUT– 28 D7 27 D6 26 D5 25 OVDD UK PACKAGE 48-LEAD (7mm × 7mm) PLASTIC QFN TOP VIEW
Supply Voltage (VDD) ................................... –0.3V to 4V Digital Output Ground Voltage (OGND)........ –0.3V to 1V Analog Input Voltage (Note 3) ......–0.3V to (VDD + 0.3V) Digital Input Voltage .....................–0.3V to (VDD + 0.3V) Digital Output Voltage ................ –0.3V to (OVDD + 0.3V) Power Dissipation.............................................2000mW Operating Temperature Range LTC2205C/LTC2204C ............................... 0°C to 70°C LTC2205I/LTC2204I.............................. –40°C to 85°C Storage Temperature Range .................. –65°C to 150°C Digital Output Supply Voltage (OVDD) .......... –0.3V to 4V
EXPOSED PAD IS GND (PIN 49) MUST BE SOLDERED TO PCB BOARD TJMAX = 150°C, θJA = 29°C/W
ORDER INFORMATION
LEAD FREE FINISH LTC2205CUK#PBF LTC2204CUK#PBF LTC2205IUK#PBF LTC2204IUK#PBF LEAD BASED FINISH LTC2205CUK LTC2204CUK LTC2205IUK LTC2204IUK TAPE AND REEL LTC2205CUK#TRPBF LTC2204CUK#TRPBF LTC2205IUK#TRPBF LTC2204IUK#TRPBF TAPE AND REEL LTC2205CUK#TR LTC2204CUK#TR LTC2205IUK#TR LTC2204IUK#TR PART MARKING* LTC2205UK LTC2204UK LTC2205UK LTC2204UK PART MARKING* LTC2205UK LTC2204UK LTC2205UK LTC2204UK PACKAGE DESCRIPTION 48-Lead (7mm x 7mm) Plastic DFN 48-Lead (7mm x 7mm) Plastic DFN 48-Lead (7mm x 7mm) Plastic DFN 48-Lead (7mm x 7mm) Plastic DFN PACKAGE DESCRIPTION 48-Lead (7mm x 7mm) Plastic DFN 48-Lead (7mm x 7mm) Plastic DFN 48-Lead (7mm x 7mm) Plastic DFN 48-Lead (7mm x 7mm) Plastic DFN TEMPERATURE RANGE 0°C to 70°C 0°C to 70°C –40°C to 85°C –40°C to 85°C TEMPERATURE RANGE 0°C to 70°C 0°C to 70°C –40°C to 85°C –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/
CONVERTER CHARACTERISTICS
PARAMETER Resolution (No Missing Codes) Integral Linearity Error Integral Linearity Error Differential Linearity Error Offset Error Offset Drift Gain Error Full-Scale Drift Transition Noise
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4)
CONDITIONS
l
VDD 13 VDD 14 GND 15 SHDN 16 DITH 17 D0 18 D1 19 D2 20 D3 21 D4 22 OGND 23 OVDD 24
MIN 16
TYP ±0.7 ±0.7 ±0.3 ±1 ±10 ±0.2 ±30 ±10 2.5
MAX ±4.5 ±4 ±1 ±8.5 ±1.9
Differential Analog Input (Note 5) Differential Analog Input (Note 5), TA = 25°C Differential Analog Input (Note 6) External Reference Internal Reference External Reference
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UNITS Bits LSB LSB LSB mV µV/°C %FS
ppm/°C ppm/°C
LSBRMS
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2
LTC2205/LTC2204
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL VIN VIN, CM IIN ISENSE IMODE CIN tAP tJITTER CMRR BW-3dB PARAMETER Analog Input Range (AIN+ – AIN–) Analog Input Common Mode Analog Input Leakage Current SENSE Input Leakage Current MODE Pin Pull-Down Current to GND Analog Input Capacitance Sample-and-Hold Aperture Delay Time Sample-and-Hold Aperture Delay Time Jitter Analog Input Common Mode Rejection Ratio Full Power Bandwidth CONDITIONS 3.135V ≤ VDD ≤ 3.465V Differential Input (Note 7) 0V ≤ AIN+, AIN– ≤ VDD 0V ≤ SENSE ≤ VDD Sample Mode ENC+ < ENC– Hold Mode ENC+ > ENC– MIN
l l l l
ANALOG INPUT
1 –1 –3
TYP 1.5 to 2.25 1.25
MAX 1.5 1 3
10 6.5 1.8 0.7 90
UNITS VP-P V µA µA µA pF pF ns fsRMS dB MHz
1V < (AIN+ = AIN–)
