LTC2205/LTC2204
16-Bit, 65Msps/40Msps
ADCs
DESCRIPTION
FEATURES
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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
APPLICATIONS
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Telecommunications
Receivers
Cellular Base Stations
Spectrum Analysis
Imaging Systems
ATE
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.
TYPICAL APPLICATION
3.3V
LTC2205: 64K Point FFT,
fIN = 5.1MHz, –1dBFS,
PGA = 0, DITH = 0
SENSE
2.2μF
AIN+
1.25V
COMMON MODE
BIAS VOLTAGE
+
ANALOG
INPUT
AIN–
16-BIT
PIPELINED
ADC CORE
S/H
AMP
–
OVDD
INTERNAL ADC
REFERENCE
GENERATOR
OUTPUT
DRIVERS
CORRECTION
LOGIC AND
SHIFT REGISTER
0.5V TO 3.6V
0.1μF
0
OF
CLKOUT
D15
•
•
•
D0
–20
AMPLITUDE (dBFS)
VCM
OGND
CLOCK/DUTY
CYCLE
CONTROL
3.3V
VDD
GND
0.1μF
0.1μF
–40
–60
–80
–100
–120
0.1μF
22076 TA01
–140
0
ENC
ENC
PGA
SHDN
DITH
MODE
OE
ADC CONTROL INPUTS
RAND
5
20
15
25
10
FREQUENCY (MHz)
30
22054 TA01b
22054fc
1
LTC2205/LTC2204
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
OVDD = VDD (Notes 1 and 2)
48 GND
47 PGA
46 RAND
45 MODE
44 OE
43 OF
42 D15
41 D14
40 D13
39 D12
38 OGND
37 OVDD
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
SENSE 1
VCM 2
VDD 3
VDD 4
GND 5
AIN+ 6
AIN– 7
GND 8
ENC+ 9
ENC– 10
GND 11
VDD 12
36 OVDD
35 D11
34 D10
33 D9
32 D8
31 OGND
30 CLKOUT+
29 CLKOUT–
28 D7
27 D6
26 D5
25 OVDD
VDD 13
VDD 14
GND 15
SHDN 16
DITH 17
D0 18
D1 19
D2 20
D3 21
D4 22
OGND 23
OVDD 24
49
UK PACKAGE
48-LEAD (7mm s 7mm) PLASTIC QFN
EXPOSED PAD IS GND (PIN 49) MUST BE SOLDERED TO PCB BOARD
TJMAX = 150°C, θJA = 29°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2205CUK#PBF
LTC2205CUK#TRPBF
LTC2205UK
48-Lead (7mm × 7mm) Plastic DFN
0°C to 70°C
LTC2204CUK#PBF
LTC2204CUK#TRPBF
LTC2204UK
48-Lead (7mm × 7mm) Plastic DFN
0°C to 70°C
LTC2205IUK#PBF
LTC2205IUK#TRPBF
LTC2205UK
48-Lead (7mm × 7mm) Plastic DFN
–40°C to 85°C
LTC2204IUK#PBF
LTC2204IUK#TRPBF
LTC2204UK
48-Lead (7mm × 7mm) Plastic DFN
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2205CUK
LTC2205CUK#TR
LTC2205UK
48-Lead (7mm × 7mm) Plastic DFN
0°C to 70°C
LTC2204CUK
LTC2204CUK#TR
LTC2204UK
48-Lead (7mm × 7mm) Plastic DFN
0°C to 70°C
LTC2205IUK
LTC2205IUK#TR
LTC2205UK
48-Lead (7mm × 7mm) Plastic DFN
–40°C to 85°C
LTC2204IUK
LTC2204IUK#TR
LTC2204UK
48-Lead (7mm × 7mm) Plastic DFN
–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
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
PARAMETER
CONDITIONS
TYP
MAX
UNITS
l
±0.7
±4.5
LSB
±0.7
±4
LSB
±0.3
±1
LSB
±1
±8.5
l
Resolution (No Missing Codes)
Integral Linearity Error
MIN
Differential Analog Input (Note 5)
Integral Linearity Error
Differential Analog Input (Note 5), TA = 25°C
Differential Linearity Error
Differential Analog Input
l
Offset Error
(Note 6)
l
Offset Drift
Bits
±10
Gain Error
External Reference
Full-Scale Drift
Internal Reference
External Reference
Transition Noise
16
l
±0.2
mV
μV/°C
±1.9
%FS
±30
±10
ppm/°C
ppm/°C
2.5
LSBRMS
22054fc
2
LTC2205/LTC2204
ANALOG INPUT
The l denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at TA = 25°C. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
VIN
Analog Input Range (AIN+ – AIN–)
MIN
3.135V ≤ VDD ≤ 3.465V
l
1
TYP
MAX
UNITS
1.5 to 2.25
VIN, CM
Analog Input Common Mode
Differential Input (Note 7)
l
IIN
Analog Input Leakage Current
0V ≤ AIN+, AIN– ≤ VDD
l
–1
ISENSE
SENSE Input Leakage Current
0V ≤ SENSE ≤ VDD
l
–3
IMODE
MODE Pin Pull-Down Current to GND
Sample Mode ENC+ < ENC–
Hold Mode ENC+ > ENC–
1.25
VP-P
1.5
V
1
μA
3
μA
10
μA
6.5
1.8
pF
pF
CIN
Analog Input Capacitance
tAP
Sample-and-Hold
Aperture Delay Time
0.7
ns
tJITTER
Sample-and-Hold
Aperture Delay Time Jitter
90
fsRMS
CMRR
Analog Input
Common Mode Rejection Ratio
60
dB
BW-3dB
Full Power Bandwidth
700
MHz
1V < (AIN+ = AIN–)
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