Document
FEATURES
n Integrated Dual 12-Bit ADCs n Sample Rate: 125Msps n Single 3V Supply (2.85V to 3.4V) n Low Power: 790mW n 70.2dB SNR, 88dB SFDR n 110dB Channel Isolation at 100MHz n Flexible Input: 1VP-P to 2VP-P Range n 640MHz Full Power Bandwidth S/H n Clock Duty Cycle Stabilizer n Shutdown and Nap Modes n Data Ready Output Clock n Pin Compatible Family
125Msps: LTC2283 (12-Bit), LTC2285 (14-Bit) 105Msps: LTC2282 (12-Bit), LTC2284 (14-Bit) 80Msps: LTC2294 (12-Bit), LTC2299 (14-Bit) 65Msps: LTC2293 (12-Bit), LTC2298 (14-Bit) 40Msps: LTC2292 (12-Bit), LTC2297 (14-Bit) n 64-Pin (9mm × 9mm) QFN Package
APPLICATIONS
n Wireless and Wired Broadband Communication n Imaging Systems n Spectral Analysis n Portable Instrumentation
LTC2283
Dual 12-Bit, 125Msps Low Power 3V ADC
DESCRIPTION
The LTC®2283 is a 12-bit 125Msps, low power dual 3V A/D converter designed for digitizing high frequency, wide dynamic range signals. The LTC2283 is perfect for demanding imaging and communications applications with AC performance that includes 70.1dB SNR and 82dB SFDR for signals at the Nyquist frequency.
Typical DC specs include ±0.4LSB INL, ±0.2LSB DNL. The transition noise is a low 0.32LSBRMS.
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 performance at full speed for a wide range of clock duty cycles. A data ready output clock (CLKOUT) can be used to latch the output data.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
ANALOG INPUT A
+
INPUT S/H
–
12-BIT PIPELINED ADC CORE
CLK A CLK B
CLOCK/DUTY CYCLE CONTROL
CLOCK/DUTY CYCLE CONTROL
ANALOG INPUT B
+
INPUT S/H
–
12-BIT PIPELINED ADC CORE
OUTPUT DRIVERS
OVDD D11A
••• D0A OGND
OF
MUX CLKOUT
OUTPUT DRIVERS
OVDD D11B
••• D0B
OGND
2283 TA01
SNR (dBFS)
SNR vs Input Frequency, –1dB, 2V Range
73 72 71 70 69 68 67 66 65
0 50 100 150 200 250 300 350 INPUT FREQUENCY (MHz) 2283 TA01b
2283fb
1
LTC2283
ABSOLUTE MAXIMUM RATINGS
OVDD = VDD (Notes 1, 2)
Supply Voltage (VDD) ..................................................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 .............................................1500mW Operating Temperature Range
LTC2283C ................................................ 0°C to 70°C LTC2283I.............................................. –40°C to 85°C Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
AINA+ 1 AINA– 2 REFHA 3
REFHA 4
REFLA 5
REFLA 6
VDD 7
CLKA 8 CLKB 9
65
VDD 10 REFLB 11
REFLB 12
REFHB 13
REFHB 14 AINB– 15 AINB+ 16
64 GND 63 VDD 62 SENSEA 61 VCMA 60 MODE 59 SHDNA 58 OEA 57 OF 56 DA11 55 DA10 54 DA9 53 DA8 52 DA7 51 DA6 50 OGND 49 OVDD
48 DA5 47 DA4 46 DA3 45 DA2 44 DA1 43 DA0 42 NC 41 NC 40 CLKOUT 39 DB11 38 DB10 37 DB9 36 DB8 35 DB7 34 DB6 33 DB5
GND 17 VDD 18 SENSEB 19 VCMB 20 MUX 21 SHDNB 22 OEB 23 NC 24 NC 25 DB0 26 DB1 27 DB2 28 DB3 29 DB4 30 OGND 31 OVDD 32
UP PACKAGE 64-LEAD (9mm × 9mm) PLASTIC QFN
TJMAX = 150°C, θJA = 20°C/W EXPOSED PAD (PIN 65) IS GND AND MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2283CUP#PBF
LTC2283CUP#TRPBF LTC2283UP
64-Lead (9mm × 9mm) Plastic QFN
0°C to 70°C
LTC2283IUP#PBF
LTC2283IUP#TRPBF
LTC2283UP
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2283CUP
LTC2283CUP#TR
LTC2283UP
64-Lead (9mm × 9mm) Plastic QFN
0°C to 70°C
LTC2283IUP
LTC2283IUP#TR
LTC2283UP
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/
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
MIN TYP MAX
UNITS
Resolution (No Missing Codes)
● 12
Bits
Integral Linearity Error
Differential Analog Input (Note 5)
● –2 ±0.4
2
LSB
Differential Linearity Error
Differential Analog Input
● –0.9 ±0.2 0.9
LSB
Offset Error
(Note 6)
● –12 ±2
12
mV
Gain Error
External Reference
● –2.5 ±0.5 2.5
%FS
Offset Drift
±10
μV/.