True Accuracy, 16-Bit ± 1ꢀ ꢁV± 1± ꢁ,
Serial Input ꢁoltage Output DAC
AD±±70
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Full 16-bit performance
1 LSB max INL and DNL
Output voltage range up to 14 V
V
V
DGND
SS
DD
AD5570
POWER-ON
RESET
On-board reference buffers, eliminating the need for a
negative reference
REFGND
R
Controlled output during power-on
Temperature range of −40°C to +85°C/−40°C to +125°C
Settling time of 10 µs to 0.003%
16-BIT
DAC
V
OUT
R
R
AGND
AGNDS
Clear function to 0 V
R
DAC REGISTER
SHIFT REGISTER
LDAC
Asynchronous update of outputs (
Power-on reset
pin)
REFIN
LDAC
POWER-DOWN
CONTROL LOGIC
PD
Serial data output for daisy chaining
Data readback facility
SDIN
SCLK
SDO
SYNC
CLR
APPLICATIONS
Industrial automation
Automatic test equipment
Process control
Figure 1.
Data acquisition systems
General-purpose instrumentation
GENERAL DESCRIPTION
purposes. Data readback allows the user to read the contents of
the DAC register via the SDO pin.
The AD5570 is a single 16-bit serial input, voltage output DAC
that operates from supply voltages of 1ꢀ V up to 15 V.
Integral linearity (INL) and differential nonlinearity (DNL) are
accurate to 1 LSB. During power-up (when the supply voltages
are changing), VOUT is clamped to 0 V via a low impedance path.
LDAC
Features on the AD5570 include
update the output of the DAC. The device also has a power-
PD
, which may be used to
down pin ( ), which allows the DAC to be put into a low
CLR
power state, and a
to 0 V.
pin that allows the output to be cleared
The AD5570 DAC comes complete with a set of reference
buffers. The reference buffers allow a single, positive reference
to be used. The voltage on REFIN is gained up and inverted
internally to give the positive and negative reference for the
DAC core. Having the reference buffers on-chip eliminates the
need for external components such as inverters, precision
amplifiers, and resistors, thereby reducing the overall solution
size and cost.
The AD5570 is available in a 16-lead SSOP package.
PRODUCT HIGHLIGHTS
1. 1 LSB maximum INL and DNL.
ꢀ. Buffered voltage output up to 1ꢁ V.
3. Output controlled during power-up.
ꢁ. On-board reference buffers.
The AD5570 uses a versatile 3-wire interface that is compatible
with SPI®, QSPI™, MICROWIRE™, and DSP® interface standards.
Data is presented to the part in the format of a 16-bit serial
word. Serial data is available on the SDO pin for daisy-chaining
5. Wide temperature range of −ꢁ0°C to +1ꢀ5°C.
Rev. 0
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