Dual, 12-/14-/16-Bit nanoDACs with
5 ppm/°C On-Chip Reference, I2C Interface
AD5627R/AD5647R/AD5667R, AD5627/AD5667
Rev. 0
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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
FUNCTIONAL BLOCK DIAGRAMS
IN
TE
R
F
A
C
E
LOG
IC
SDA
SCL
ADDR
VDD
GND
POWER-ON
RESET
1.25V/2.5V REF
VREFIN/VREFOUT
AD5627R/AD5647R/AD5667R
POWER-DOWN
LOGIC
INPUT
REGISTER
DAC
REGISTER
STRING
DAC A
VOUTA
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC B
VOUTB
LDAC CLR
BUFFER
063
42
-00
1
Figure 1. AD5627R/AD5647R/AD5667R
IN
T
E
R
F
A
C
E
LO
G
IC
SDA
SCL
ADDR
VDD
GND
POWER-ON
RESET
VREFIN
AD5627/AD5667
POWER-DOWN
LOGIC
INPUT
REGISTER
DAC
REGISTER
STRING
DAC A
VOUTA
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC B
VOUTB
LDAC CLR
BUFFER
063
42
-00
2
Figure 2. AD5627/AD5667
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
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.
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