Quad, 12-/14-/16-Bit nanoDACs
®
with
5 ppm/°C On-Chip Reference
AD5624R/AD5644R/AD5664R
Rev. A
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FEATURES
Low power, smallest pin-compatible, quad nanoDACs
AD5664R: 16 bits
AD5644R: 14 bits
AD5624R: 12 bits
User selectable external or internal reference
External reference default
On-chip 1.25 V/2.5 V, 5 ppm/°C reference
10-lead MSOP and 3 mm × 3 mm LFCSP_WD
2.7 V to 5.5 V power supply
Guaranteed monotonic by design
Power-on reset to zero scale
Per channel power-down
Serial interface, up to 50 MHz
APPLICATIONS
Process control
Data acquisition systems
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
FUNCTIONAL BLOCK DIAGRAM
INTERFACE
LOGIC
SCLK
SYNC
DIN
INPUT
REGISTER
DAC
REGISTER
V
DD
GND
POWER-ON
RESET
1.25V/2.5V REF
STRING
DAC A
BUFFER
V
REFIN
/
V
REFOUT
V
OUT
A
INPUT
REGISTER
DAC
REGISTER
STRING
DAC B
BUFFER
V
OUT
B
INPUT
REGISTER
DAC
REGISTER
STRING
DAC C
BUFFER
V
OUT
C
INPUT
REGISTER
DAC
REGISTER
STRING
DAC D
BUFFER
V
OUT
D
AD5624R/AD5644R/AD5664R
POWER-DOWN
LOGIC
05856-001
Figure 1.
Table 1. Related Devices
Part No. Description
AD5624/AD5664
2.7 V to 5.5 V quad, 12-/16-bit
DACs, external reference
AD5666
2.7 V to 5.5 V quad 16-bit DAC,
internal reference,
LDAC, CLR pins
GENERAL DESCRIPTION
The AD5624R/AD5644R/AD5664R, members of the nanoDAC
family, are low power, quad, 12-/14-/16-bit buffered voltage-out
DACs. All devices operate from a single 2.7 V to 5.5 V supply
and are guaranteed monotonic by design.
The AD5624R/AD5644R/AD5664R have an on-chip reference.
The AD56x4R-3 has a 1.25 V, 5 ppm/°C reference, giving a full-
scale output range of 2.5 V; the AD56x4R-5 has 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 and all devices can be operated from a single
2.7 V to 5.5 V supply. The internal reference is enabled via a
software write.
The part incorporates 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 AD5624R/AD5644R/AD5664R use a versatile 3-wire serial
interface that operates at clock rates up to 50 MHz, and is
compatible with standard SPI®, QSPI™, MICROWIRE™, and
DSP interface standards. The on-chip precision output amplifier
enables rail-to-rail output swing.
PRODUCT HIGHLIGHTS
1. Quad 12-/14-/16-bit DACs.
2. On-chip 1.25 V/2.5 V, 5 ppm/°C reference.
3. Available in 10-lead MSOP and 10-lead, 3 mm × 3 mm,
LFCSP_WD.
4. Low power, typically consumes 1.32 mW at 3 V and
2.25 mW at 5 V.
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