LTC2635 Linear Technology, LTC2635 Datasheet
LTC2635
Available stocks
Related parts for LTC2635
LTC2635 Summary of contents
Page 1
... It has rail-to-rail output buffers and is guaran- teed monotonic. The LTC2635-L has a full-scale output of 2.5V, and operates from a single 2.7V to 5.5V supply. The LTC2635-H has a full-scale output of 4.096V, 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 the external reference voltage ...
Page 2
... Supply Voltage (V ) ................................... –0. SCL, SDA, REFLO, LDAC .............................. –0. CA0, CA1, CA2 ...... –0.3V to Min (V OUTA-D REF .................................... –0.3V to Min (V Operating Temperature Range LTC2635C ................................................ 0°C to 70°C LTC2635H (Note 3) ............................ –40°C to 125°C PIN CONFIGURATION TOP VIEW OUTA ...
Page 3
... Z = Reset to Zero-Scale in Internal Reference Mode FULL-SCALE VOLTAGE, INTERNAL REFERENCE MODE 4.096V PACKAGE TYPE UD = 16-Pin QFN MSE = 10-Lead MSOP TEMPERATURE GRADE C = Commercial Temperature Range (0°C to 70° Automotive Temperature Range (–40°C to 125°C) PRODUCT PART NUMBER http://www.linear.com/leadfree/ http://www.linear.com/tapeandreel/ LTC2635 2635f 3 ...
Page 4
... LTFBS LTC2635-HZ12 LDZC LTDZZ LTC2635-HZ10 LDZK LTFBH LTC2635-HZ8 LDZS LTFBQ *Above options are available in a 16-pin QFN package (LTC2635xUD) or 10-lead MSOP package (LTC2635xMSE). **Contact Linear Technology for other Hi-Z options. www.DataSheet4U.com 4 POWER-ON VFS WITH INTERNAL POWER-ON REFERENCE REFERENCE RESET TO CODE 2.5V • (4095/4096) Mid-Scale 2.5V • ...
Page 5
... ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T LTC2635-LMI12/-LMI10/-LMI8/-LMX12/-LMX10/-LMX8/-LZ12/-LZ10/-LZ8/-LMO12/-LMO10/-LM08 (V SYMBOL PARAMETER CONDITIONS DC Performance Resolution Monotonicity V CC DNL Differential Nonlinearity V CC INL Integral Nonlinearity V CC ZSE Zero-Scale Error V CC ...
Page 6
... LTC2635 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T LTC2635-LMI12/-LMI10/-LMI8/-LMX12/-LMX10/-LMX8/-LZ12/-LZ10/-LZ8/-LMO12/-LMO10/-LM08 (V SYMBOL PARAMETER Reference Input Input Voltage Range Resistance Capacitance I Reference Current, Power-Down Mode REF Reference Output Output Voltage ...
Page 7
... ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T LTC2635-LMI12/-LMI10/-LMI8/-LMX12/-LMX10/-LMX8/-LZ12/-LZ10/-LZ8/-LMO12/-LMO10/-LM08 (V SYMBOL PARAMETER AC Performance t Settling Time S Voltage Output Slew Rate Capacitive Load Driving Glitch Impulse DAC-to-DAC Crosstalk Multiplying Bandwidth ...
Page 8
... LTC2635 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T LTC2635-HMI12/-HMI10/-HMI8/-HZ12/-HZ10/-HZ8 (V SYMBOL PARAMETER CONDITIONS DC Performance Resolution Monotonicity V CC DNL Differential Nonlinearity V CC INL Integral Nonlinearity V CC ZSE Zero-Scale Error Offset Error Temperature ...
Page 9
... ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T LTC2635-HMI12/-HMI10/-HMI8/-HZ12/-HZ10/-HZ8 (V SYMBOL PARAMETER Reference Input Input Voltage Range Resistance Capacitance I Reference Current, Power-Down Mode REF Reference Output Output Voltage Reference Temperature Coefficient Output Impedance Capacitive Load Driving ...
Page 10
... Glitch Impulse DAC-to-DAC Crosstalk Multiplying Bandwidth e Output Voltage Noise Density n Output Voltage Noise TIMING CHARACTERISTICS temperature range, otherwise specifi cations are at T LTC2635-HMI12/-HMI10/-HMI8/-HZ12/-HZ10/-HZ8 (V SYMBOL PARAMETER www.DataSheet4U.com f SCL Clock Frequency SCL t Hold Time (Repeated) Start Condition ...
Page 11
... For 12 and linearity is defined from code 16 to code 4,095. L Note 5. Inferred from measurement at code 16 (LTC2635-12), code 4 (LTC2635-10) or code 1 (LTC2635-8), and at full-scale. Note 6. This IC includes current limiting that is intended to protect the device during momentary overload conditions. Junction temperature can www ...
Page 12
... LTC2635 TYPICAL PERFORMANCE CHARACTERISTICS LTC2635-L12 (Internal Reference, V Integral Nonlinearity (INL) 1 0.5 0 –0.5 –1.0 0 1024 INL vs Temperature 1 0.5 INL (POS) 0 –0.5 INL (NEG) www.DataSheet4U.com –1.0 –50 – 100 TEMPERATURE (°C) Settling to ±1 LSB Rising 9th CLOCK OF 3rd DATA BYTE ...
Page 13
... TYPICAL PERFORMANCE CHARACTERISTICS LTC2635-H12 (Internal Reference, V Integral Nonlinearity (INL) 1 0.5 0 –0.5 –1.0 0 1024 INL vs Temperature 1 INL (POS) 0.5 0 INL (NEG) –0.5 www.DataSheet4U.com –1.0 –50 – 100 TEMPERATURE (°C) Settling to ±1 LSB Rising 9th CLOCK OF 3rd DATA BYTE SCL 5V/DIV 3.9μ ...
Page 14
... Integral Nonlinearity (INL) 0. 2.5V FS INTERNAL REF 0.25 0 –0.25 –0.50 www.DataSheet4U.com 0 64 LTC2635 Load Regulation (LTC2635- (LTC2635- (LTC2635- –2 –4 –6 INTERNAL REF. –8 CODE = MID-SCALE –10 –30 –20 – (mA) OUT 14 512 768 1023 CODE ...
Page 15
... TYPICAL PERFORMANCE CHARACTERISTICS LTC2635 Large-Signal Response V OUT 0.5V/DIV 1/4 SCALE to 3/4 SCALE 2μs/DIV Headroom at Rails vs Output Current 5.0 5V SOURCING 4.5 4.0 3.5 3V (LTC2635-L) SOURCING 3.0 2.5 2.0 1.5 5V SINKING 1.0 3V (LTC2635-L) SINKING 0.5 0 www.DataSheet4U.com (mA) OUT Supply Current vs Logic Voltage 1.6 SWEEP SDA, SCL BETWEEN 1.4 0V AND V CC 1.2 1.0 0.8 0.6 ...
Page 16
... FREQUENCY (Hz) 2635 G31 DAC-to-DAC Crosstalk (Dynamic) 9th CLOCK OF 3rd SCL DATA BYTE 5V/DIV 1 DAC SWITCH 0-FS 2V/DIV V OUT 2mV/DIV LTC2635-H12, V 3nV • s TYPICAL C 2μs/DIV 2635 G34 T = 25°C, unless otherwise noted. A Gain Error vs Reference Input 1 5.5V CC 0.8 GAIN ERROR OF 4 CHANNELS ...
Page 17
... When External Reference mode is selected, REF is an input (1V ≤ V the full-scale DAC output voltage. When Internal Reference is selected, the 10ppm/°C 1.25V (LTC2635-L) or 2.048V (LTC2635-H) internal reference (half full-scale) is available at the pin. This output may be bypassed to GND with up to 10μF, and must be buffered when driving an external DC load current ...
Page 18
... LTC2635 BLOCK DIAGRAM GND (REFLO) V OUTA V REF V OUTB (LDAC) CA0 (CA1) (CA2 QFN PACKAGE ONLY www.DataSheet4U.com 18 DAC A DAC B DECODE ADDRESS DECODE INTERFACE REF INTERNAL SWITCH REFERENCE V REF OUTD DAC D V REF V OUTC DAC C POWER-ON RESET SCL SDA 2635 BD ...
Page 19
... TC01 t SU(DAT) t LOW HD(STA) SU(STA HIGH HD(DAT) AND V LEVELS IH(MIN) IL(MAX) 2 Figure Timing LTC2635 Test Circuit INH INL INF CAn 2635 TC02 GND t BUF HD(STA) t SU(STO 2635 F01 2635f ...
Page 20
... Figure 2a. Typical LTC2635 Write Transaction 9TH CLOCK OF 3RD DATA BYTE SCL t 1 LDAC Figure 2b. LTC2635 LDAC Timing (QFN Package Only) 3RD DATA BYTE ACK 2635 F02b X ACK ...
Page 21
... OPERATION The LTC2635 is a family of quad voltage output DACs in 16-pin QFN and 10-lead MSOP packages. Each DAC can operate rail-to-rail using an external reference, or with its full-scale voltage set by an integrated reference. Eighteen combinations of accuracy (12-, 10-, and 8-bit), power-on reset value (zero-scale, mid-scale in internal reference mode, or mid-scale in external reference mode), DAC power-down output load (high impedance or 200kΩ ...
Page 22
... The slave address assignments are shown in Tables 1 and 2. In addition to the address selected by the address pins, the part also responds to a global address. This address allows a common write to all LTC2635 parts to be ac- complished using one 3-byte write transaction on the www.DataSheet4U.com bus ...
Page 23
... The master initiates communication with the LTC2635 with a START condition and a 7-bit slave address followed by the Write bit ( The LTC2635 acknowledges by pulling the SDA pin low at the 9th clock if the 7-bit slave address matches the address of the part (set by CA0, CA1 or CA2) or the global address ...
Page 24
... The LTC2635-LMO options power-up with all DAC outputs in this high-impedance state. They remain that way until given a software or hardware update command. For all LTC2635 options, input- and DAC-register contents are not disturbed during power-down ...
Page 25
... The resistance from the LTC2635 GND pin to the ground plane should be as low as possible. Resistance here will add directly to the effective DC output impedance of the device (typically 0.1Ω ...
Page 26
... When the LTC2635 is sinking large currents, this current fl ows out the ground pin and directly to the power ground trace without affecting the analog ground plane voltage sometimes necessary to interrupt the ground plane to confi ...
Page 27
... SDA ACK SCL V OUT X = DON’T CARE Figure 4. Typical LTC2635 Input Waveform—Programming DAC Output for Full-Scale www.DataSheet4U.com COMMAND/ADDRESS MS DATA D11 D10 ACK ...
Page 28
... LTC2635 OPERATION OUTPUT VOLTAGE 0V NEGATIVE INPUT CODE OFFSET (b) Figure 5. Effects of Rail-to-Rail On a DAC Transfer Curve (Shown for 12 Bits). www.DataSheet4U.com REF CC OUTPUT VOLTAGE 0V 0 2,048 INPUT CODE (a) (a) Overall Transfer Function (b) Effect of Negative Offset for Codes Near Zero (c) Effect of Positive Full-Scale Error for Codes Near Full-Scale ...
Page 29
... APPLICATION INFORMATION Voltage Margining Application with LTC3850 (1.2V ±5%) –LTC2635– LMO Option Only 1nF 10k DAC D V OUTPUT DAC CODE OUT 1.26V 0.5V 819 1.2V 0.8V 1311 www.DataSheet4U.com 1.14V 1.1V 1802 0.1μF 2.2Ω 100k 0.1μF PGOOD INTV LIM 10k BOOST1 FREQ LTC3850EUF 1nF 3 ...
Page 30
... LTC2635 PACKAGE DESCRIPTION 3.50 0.05 1.45 0.05 (4 SIDES) 2.10 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: www.DataSheet4U.com 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5 ...
Page 31
... MAX DETAIL “A” SEATING PLANE 0.17 – 0.27 (.007 – .011) 0.50 TYP (.0197) BSC LTC2635 2.06 0.102 (.081 .004) 0.29 REF 1.83 0.102 (.072 .004) 0.05 REF DETAIL “B” CORNER TAIL IS PART OF THE LEADFRAME FEATURE. DETAIL “B” FOR REFERENCE ONLY NO MEASUREMENT PURPOSE ...
Page 32
... LTC2635 RELATED PARTS PART NUMBER DESCRIPTION LTC1660/LTC1665 Octal 10-/8-Bit V OUT Narrow SSOP LTC1664 Quad 10-Bit V DAC in 16-Pin Narrow OUT SSOP LTC1821 Parallel 16-Bit Voltage Output DAC LTC2600/LTC2610/ Octal 16-/14-/12-Bit V LTC2620 16-Lead Narrow SSOP LTC2601/LTC2611/ Single 16-/14-/12-Bit V LTC2621 10-Lead DFN LTC2602/LTC2612/ Dual 16-/14-/12-Bit V ...