Document
LTC2636
Octal 12-/10-/8-Bit SPI VOUT DACs with10ppm/°C Reference
FEATURES
DESCRIPTION
n Integrated Precision Reference 2.5V Full-Scale 10ppm/°C (LTC2636-L) 4.096V Full-Scale 10ppm/°C (LTC2636-H)
n Maximum INL Error: 2.5LSB (LTC2636-12) n Low Noise: 0.75mVP-P 0.1Hz to 200KHz n Guaranteed Monotonic Over –40°C to 125°C
Temperature Range n Selectable Internal or External Reference n 2.7V to 5.5V Supply Range (LTC2636-L) n Ultralow Crosstalk Between DACs (<2.4nV•s) n Low Power: 0.9mA at 3V (LTC2636-L) n Power-On-Reset to Zero-Scale/Mid-Scale n Double-Buffered Data Latches n Tiny 14-Lead 4mm × 3mm DFN and 16-Lead MSOP
Packages
APPLICATIONS
n Mobile Communications n Process Control and Industrial Automation n Automatic Test Equipment n Portable Equipment n Automotive n Optical Networking
The LTC®2636 is a family of octal 12-, 10-, and 8-bit voltage-output DACs with an integrated, high-accuracy, low-drift 10ppm/°C reference in 14-lead DFN and 16-lead MSOP packages. It has a rail-to-rail output buffer and is guaranteed monotonic. The LTC2636-L has a full-scale output of 2.5V, and operates from a single 2.7V to 5.5V supply. The LTC2636-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 DAC full-scale output to the external reference voltage. These DACs communicate via an SPI/MICROWIRE-compatible 3-wire serial interface which operates at clock rates up to 50MHz. Hardware clear (CLR) and asynchronous DAC update (LDAC) pins are available in the MSOP package. The LTC2636 incorporates a power-on reset circuit. Options are available for reset to zero-scale or reset to mid-scale in internal reference mode, or reset to mid-scale in external reference mode after power-up.
All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 5396245, 5859606, 6891433, 6937178, 7414561.
REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER REGISTER
INL (LSB)
BLOCK DIAGRAM
INTERNAL REFERENCE GND
VOUTA VREF
VOUTB VREF
VOUTC VREF
VOUTD
CS/LD
SCK (LDAC)
DAC A DAC B DAC C DAC D
CONTROL LOGIC
DECODE
32-BIT SHIFT REGISTER ( ) MSOP PACKAGE ONLY
SWITCH VREF
DAC H
DAC G
DAC F
DAC E
REF
VCC VOUTH VREF VOUTG VREF VOUTF VREF VOUTE
SDI
POWER-ON RESET
(CLR)
2636 BD
12-Bit Integral Nonlinearity (LTC2636-LZ12)
2 VCC = 3V INTERNAL REF.
1
0
–1
–2 0
1024
2048 CODE
3072
4095
2636 TA01
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Rev D
1
LTC2636
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Supply Voltage (VCC) ................................... –0.3V to 6V CS/LD, SCK, SDI, LDAC, CLR ....................... –0.3V to 6V VOUT A–VOUT H .................–0.3V to Min(VCC + 0.3V, 6V) REF ...................................–0.3V to Min(VCC + 0.3V, 6V) Operating Temperature Range
LTC2636C................................................ .