Document
Dual, 12-/14-/16-Bit nanoDACs® with 5 ppm/°C On-Chip Reference, I2C® Interface
AD5627R/AD5647R/AD5667R, AD5627/AD5667
06342-001
06342-002
FEATURES
Low power, smallest pin-compatible, dual nanoDACs AD5627R/AD5647R/AD5667R
12-/14-/16-bit On-chip 1.25 V/2.5 V, 5 ppm/°C reference AD5627/AD5667 12-/16-bit External reference only 3 mm x 3 mm LFCSP and 10-lead MSOP 2.7 V to 5.5 V power supply Guaranteed monotonic by design Power-on reset to zero scale Per channel power-down Hardware LDAC and CLR functions I2C-compatible serial interface supports standard (100 kHz), fast (400 kHz), and high speed (3.4 MHz) modes
APPLICATIONS
Process control Data acquisition systems Portable battery-powered instruments Digital gain and offset adjustment Programmable voltage and current sources Programmable attenuators
GENERAL DESCRIPTION
The AD5627R/AD5647R/AD5667R, AD5627/AD5667 members of the nanoDAC family are low power, dual, 12-, 14-, 16-bit buffered voltage-out DACs with/without on-chip reference. All devices operate from a single 2.7 V to 5.5 V supply, are guaranteed monotonic by design, and have an I2Ccompatible serial interface.
The AD5627R/AD5647R/AD5667R have an on-chip reference. The AD56x7RBCPZ have a 1.25 V, 5 ppm/°C reference, giving a full-scale output range of 2.5 V; the AD56x7RBRMZ have a 2.5 V, 5 ppm/°C reference, giving a full-scale output range of 5 V. The on-chip reference is off at power-up, allowing the use of an external reference. The internal reference is enabled via a software write. The AD5667 and AD5627 require an external reference voltage to set the output range of the DAC.
The AD56x7R/AD56x7 incorporate a power-on reset circuit that ensures the DAC output powers up to 0 V, and remains there until a valid write takes place. The part contains a perchannel power-down feature that reduces the current consumption of the device to 480 nA at 5 V and provides
ADDR SCL SDA
FUNCTIONAL BLOCK DIAGRAMS
VDD
GND
VREFIN/VREFOUT
AD5627R/AD5647R/AD5667R
INPUT REGISTER
DAC REGISTER
1.25V/2.5V REF
STRING DAC A
BUFFER
INTERFACE LOGIC
INPUT REGISTER
DAC REGISTER
STRING DAC B
BUFFER
VOUTA VOUTB
POWER-ON RESET
POWER-DOWN LOGIC
ADDR SCL SDA
LDAC CLR
Figure 1. AD5627R/AD5647R/AD5667R
VDD
GND
VREFIN
AD5627/AD5667
INPUT REGISTER
DAC REGISTER
STRING DAC A
BUFFER
INTERFACE LOGIC
INPUT REGISTER
DAC REGISTER
STRING DAC B
BUFFER
POWER-ON RESET
POWER-DOWN LOGIC
VOUTA VOUTB
LDAC CLR
Figure 2. AD5627/AD5667
software-selectable output loads while in power-down mode. The low power consumption of this part in normal operation makes it ideally suited to portable battery-operated equipment. The on-chip precision output amplifier enables rail-to-rail output swing.
The AD56x7R/AD56x7 use a 2-wire I2C-compatible serial interface that operates in standard (100 kHz), fast (400 kHz), and high speed (3.4 MHz) modes.
Table 1. Related Devices Part No. AD5663
AD5623R/AD5643R/AD5663R
AD5625R/AD5645R/AD5665R, AD5625/AD5665
Description
2.7 V to 5.5 V, dual 16-bit DAC, external reference, SPI® interface
2.7 V to 5.5 V, dual 12-, 14-, 16-bit DACs, internal reference, SPI interface
2.7 V to 5.5 V, quad 12-, 14-, 16-bit DACs, with/without internal reference, I2C interface
Rev. 0
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AD5627R/AD5647R/AD5667R, AD5627/AD5667
TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagrams............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3
AC Characteristics........................................................................ 5 I2C Timing Specifications............................................................ 6 Absolute Maximum Ratings............................................................ 8 ESD Caution.................................................................................. 8 Pin Configuration and Function Descriptions............................. 9 Typical Performance Characterist.