AD5627_15 Datasheet, PDF (1/32 Pages) Analog Devices – Dual, 12-/14-/16-Bit nanoDACs with 5 ppm/C On-Chip Reference, IC Interface

Dual, 12-/14-/16-Bit nanoDACs^® with
5 ppm/°C On-Chip Reference, I²C^® Interface
AD5627R/AD5647R/AD5667R, AD5627/AD5667
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 I²C-
compatible 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 per-
channel 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
V_DD
GND
V_REFIN/V_REFOUT
AD5627R/AD5647R/AD5667R
INPUT
REGISTER
DAC
REGISTER
1.25V/2.5V REF
BUFFER
STRING
DAC A
V_OUTA
INPUT
REGISTER
DAC
REGISTER
BUFFER
STRING
DAC B
V_OUTB
POWER-ON
RESET
POWER-DOWN
LOGIC
LDAC CLR
Figure 1. AD5627R/AD5647R/AD5667R
V_DD
GND
V_REFIN
AD5627/AD5667
ADDR
SCL
SDA
INPUT
REGISTER
DAC
REGISTER
INPUT
REGISTER
DAC
REGISTER
POWER-ON
RESET
BUFFER
STRING
DAC A
STRING
DAC B
BUFFER
POWER-DOWN
LOGIC
V_OUTA
V_OUTB
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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