Document
FEATURES
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LTC2657 Octal I2C 16-/12-Bit Rail-to-Rail DACs with 10ppm/°C Max Reference DESCRIPTION
The LTC®2657 is a family of octal I2C 16-/12-Bit Rail-toRail DACs with Integrated 10ppm/°C Max Reference. The DACs have built-in high performance, rail-to-rail, output buffers and are guaranteed monotonic. The LTC2657-L has a full-scale output of 2.5V with the integrated reference and operates from a single 2.7V to 5.5V supply. The LTC2657-H has a full-scale output of 4.096V with the integrated reference and operates from a 4.5V to 5.5V supply. Each DAC can also operate with an external reference, which sets the full-scale output to 2 times the external reference voltage. The parts use a 2-wire I2C compatible serial interface. The LTC2657 operates in both the standard mode (maximum clock rate of 100kHz) and the fast mode (maximum clock rate of 400kHz). The LTC2657 incorporates a power-on reset circuit that is controlled by the PORSEL pin. If PORSEL is tied to GND the DACs reset to zero-scale at power-up. If PORSEL is tied to VCC , the DACs reset to mid-scale at power-up.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5396245, 6891433 and patent pending.
Integrated Reference 10ppm/°C Max Maximum INL Error: ±4LSB Guaranteed Monotonic Over Temperature Selectable Internal or External Reference 2.7V to 5.5V Supply Range (LTC2657-L) Integrated Reference Buffers Ultralow Crosstalk between DACs(0.8nV•s) Power-On-Reset to Zero-Scale/Mid-Scale 400kHz I2C Interface Tiny 20-Lead 4mm × 5mm QFN and 20-Lead Thermally enhanced TSSOP packages
APPLICATIONS
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Mobile Communications Process Control and Industrial Automation Instrumentation Automatic Test Equipment Automotive
BLOCK DIAGRAM
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REFCOMP GND REGISTER REGISTER REGISTER REGISTER REFLO VOUTA DAC A VCC REF INTERNAL REFERENCE REFIN/OUT
INL vs Code (LTC2657-16)
4
DAC H VOUTH
3 2
REGISTER
REGISTER
REGISTER
REGISTER
VOUTB
DAC B
DAC G
VOUTG
INL (LSB)
1 0 –1
REGISTER
REGISTER
REGISTER
REGISTER
VOUTC
DAC C
DAC F
VOUTF
–2 –3
DAC A DAC B DAC C DAC D 16384 32768 CODE 49152
DAC E DAC F DAC G DAC H 65535
2657 TA01
REGISTER
REGISTER
REGISTER
VOUTD CA0 CA1 CA2 LDAC
REGISTER
DAC D
DAC E POWER-ON RESET
VOUTE PORSEL
–4 128
32-BIT SHIFT REGISTER 2-WIRE INTERFACE SDA SCL
2657 BD
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LTC2657 ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VCC) ................................... –0.3V to 6V SCL, SDA, LDAC, REFLO.............................. –0.3V to 6V VOUTA to VOUTH ................. –0.3V to Min(VCC + 0.3V, 6V) REFIN/OUT, REFCOMP ...... –0.3V to Min(VCC + 0.3V, 6V) PORSEL, CA0, CA1, CA2 ... –0.3V to Min(VCC + 0.3V, 6V)
Operating Temperature Range LTC2657C ................................................ 0°C to 70°C LTC2657I..............................................–40°C to 85°C Maximum Junction Temperature........................... 150°C Storage Temperature Range.......................–65 to 150°C Lead Temperature (Soldering FE-Package, 10 sec) .. 300°C
PIN CONFIGURATION
REFLO VOUTA TOP VIEW REFLO VOUTA VOUTB REFCOMP VOUTC VOUTD REFIN/OUT LDAC CA2 1 2 3 4 5 6 7 8 9 21 20 GND 19 VCC 18 VOUTH 17 VOUTG 16 VOUTF 15 VOUTE 14 PORSEL 13 CA0 12 CA1 11 SDA VOUTB 1 REFCOMP 2 VOUTC 3 VOUTD 4 REFIN/OUT 5 LDAC 6 7 CA2 8 SCL 9 10 SDA CA1 21 TOP VIEW GND VCC 16 VOUTH 15 VOUTG 14 VOUTF 13 VOUTE 12 PORSEL 11 CA0
20 19 18 17
SCL 10
FE PACKAGE 20-LEAD PLASTIC TSSOP TJMAX = 150°C, θJA = 38°C/W, θJC = 10°C/W EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
UFD PACKAGE 20-LEAD (4mm s 5mm) PLASTIC QFN TJMAX = 150°C, θJA = 43°C/W EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
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LTC2657 PRODUCT SELECTOR GUIDE
LTC2657 B C UFD -L 16 #TR PBF LEAD FREE DESIGNATOR TAPE AND REEL TR = Tape and Reel RESOLUTION 16 = 16-Bit 12 = 12-Bit FULL-SCALE VOLTAGE, INTERNAL REFERENCE MODE L = 2.5V H = 4.096V PACKAGE TYPE UFD = 20-Lead (4mm × 5mm) Plastic QFN FE = 20-Lead Thermally Enhanced TSSOP TEMPERATURE GRADE C = Commercial Temperature Range (0°C to 70°C) I = Industrial Temperature Range (–40°C to 85°C) ELECTRICAL GRADE (OPTIONAL) B = ±4LSB INL (MAX) PRODUCT PART NUMBER 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/
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LTC2657 ORDER INFORMATION
LEAD FREE FINISH LTC2657BCFE-L16#PBF LTC2657BIFE-L16#PBF LTC2657BCUFD-L16#PBF LTC2657BIUFD-L16#PBF LTC2657BCFE-H16#PBF LTC2657BIFE-H16#PBF LTC2657BCUFD-H16#PBF LTC2657BIUFD-H16#PBF LTC2657CFE-L12#PBF LTC2657IFE-L12#PBF LTC2657CUFD-L12#PBF LTC2657IUFD-L12#PBF LTC2657CFE-H12#PBF LTC2657IFE-H12#PBF LTC2657CUFD-H12#PBF LTC2657IUFD-H12#PBF TAPE AND REEL LTC2657BCFE-L16#TRPBF LTC2657B.