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Quad, 16-Bit DAC with 5 ppm/°C
On-Chip Reference in 14-Lead TSSOP
AD5666
Rev. D
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FEATURES
Low power quad 16-bit DAC
14-lead TSSOP
On-chip 1.25 V/2.5 V, 5 ppm/°C reference
Power down to 400 nA @ 5 V, 200 nA @ 3 V
2.7 V to 5.5 V power supply
Guaranteed monotonic by design
Power-on reset to zero scale or midscale
3 power-down functions
Hardware
LDAC
with
LDAC
override function
CLR
function to programmable code
SDO daisy-chaining option
Rail-to-rail operation
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
INPUT
REGISTER
DIN
LDAC
GND
V
DD
LDAC
V
REFIN
/
V
REFOUT
SYNC
SCLK
AD5666
CLR
1.25V/2.5V
REF
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
DAC
REGISTER
STRING
DAC A
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC B
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC C
BUFFER
INPUT
REGISTER
DAC
REGISTER
STRING
DAC D
BUFFER
SDO
POR
POWER-DOWN
LOGIC
POWER-ON
RESET
05298-001
Figure 1.
GENERAL DESCRIPTION
The AD5666 is a low power, quad, 16-bit, buffered voltage-
output DAC. The part operates from a single 2.7 V to 5.5 V
supply and is guaranteed monotonic by design.
The AD5666 has an on-chip reference with an internal gain of 2.
The AD5666-1 has a 1.25 V 5 ppm/°C reference, giving a full-scale
output of 2.5 V; the AD5666-2 has a 2.5 V 5 ppm/°C reference,
giving a full-scale output of 5 V. The on-board reference is off at
power-up, allowing the use of an external reference. The internal
reference is turned on by writing to the DAC.
The part incorporates a power-on reset circuit that ensures that
the DAC output powers up to 0 V (POR pin low) or to midscale
(POR pin high) and remains powered up at this level until a valid
write takes place. The part contains a power-down feature that
reduces the current consumption of the device to 400 nA at 5 V
and provides software-selectable output loads while in power-down
mode for any or all DAC channels.
The outputs of all DACs can be updated simultaneously using
the
LDAC
function, with the added functionality of user-select-
able DAC channels to simultaneously update. There is also an
asynchronous
CLR
that clears all DACs to a software-selectable
code—0 V, midscale, or full scale.
The AD5666 utilizes a versatile 3-wire serial interface that operates
at clock rates of 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, 16-bit DAC.
2. On-chip 1.25 V/2.5 V, 5 ppm/°C reference.
3. Available in 14-lead TSSOP.
4. Selectable power-on reset to 0 V or midscale.
5. Power-down capability. When powered down, the DAC
typically consumes 200 nA at 3 V and 400 nA at 5 V.
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 11
- ・ Abmessungen des Paketumrisses on Seite 27
- ・ Teilenummerierungssystem on Seite 27
- ・ Blockdiagramm on Seite 1
- ・ Schweißen Temperatur on Seite 10
- ・ Beschreibung der Funktionen on Seite 1 Seite 11
- ・ Technische Daten on Seite 1 Seite 3 Seite 8 Seite 10
- ・ Anwendungsbereich on Seite 1
- ・ Elektrische Spezifikation on Seite 12
