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REV. 0
AD5307/AD5317/AD5327
–14–
When data has been transferred into the input register of a DAC,
the corresponding DAC register and DAC output can be updated
by taking LDAC low. CLR is an active-low, asynchronous clear
that clears the input registers and DAC registers to all zeros.
Low Power Serial Interface
To minimize the power consumption of the device, the interface
only powers up fully when the device is being written to, i.e., on
the falling edge of SYNC. The SCLK and DIN input buffers are
powered down on the rising edge of SYNC.
Daisy-Chaining
For systems that contain several DACs, or where the user wishes to
read back the DAC contents for diagnostic purposes, the SDO
pin may be used to daisy-chain several devices together and
provide serial readback.
By connecting the DCEN (Daisy-Chain Enable) pin high, the
Daisy-Chain Mode is enabled. It is tied low in the case of Stand-
alone Mode. In Daisy-Chain Mode the internal gating on SCLK is
disabled. The SCLK is continuously applied to the input shift
register when SYNC is low. If more than 16 clock pulses are
applied, the data ripples out of the shift register and appears on
the SDO line. This data is clocked out on the rising edge of
SCLK and is valid on the falling edge. By connecting this line to
the DIN input on the next DAC in the chain, a multi-DAC
interface is constructed. Sixteen clock pulses are required for
each DAC in the system. Therefore, the total number of clock
cycles must equal 16N where N is the total number of devices
in the chain. When the serial transfer to all devices is complete,
SYNC should be taken high. This prevents any further data being
clocked into the input shift register.
A continuous SCLK source may be used if it can be arranged
that SYNC is held low for the correct number of clock cycles.
Alternatively, a burst clock containing the exact number of clock
cycles may be used and SYNC taken high some time later.
When the transfer to all input registers is complete, a common
LDAC signal updates all DAC registers and all analog outputs
are updated simultaneously.
Double-Buffered Interface
The AD5307/AD5317/AD5327 DACs all have double-buffered
interfaces consisting of two banks of registers: input registers
and DAC registers. The input registers are connected directly to
the input shift register and the digital code is transferred to the
relevant input register on completion of a valid write sequence.
The DAC registers contain the digital code used by the resis-
tor strings.
Access to the DAC registers is controlled by the LDAC pin. When
the LDAC pin is high, the DAC registers are latched and the input
registers may change state without affecting the contents of
the DAC registers. When LDAC is brought low, however, the
DAC registers become transparent and the contents of the
input registers are transferred to them.
The double-buffered interface is useful if the user requires simulta-
neous updating of all DAC outputs. The user may write to three
of the input registers individually and then, by bringing LDAC
low when writing to the remaining DAC input register, all
outputs will update simultaneously.
These parts contain an extra feature whereby a DAC register is
not updated unless its input register has been updated since the
last time LDAC was brought low. Normally, when LDAC is
brought low, the DAC registers are filled with the contents of
the input registers. In the case of the AD5307/AD5317/AD5327,
the part will only update the DAC register if the input register
has been changed since the last time the DAC register was
updated thereby removing unnecessary digital crosstalk.
Load DAC Input (LDAC)
LDAC transfers data from the input registers to the DAC regis-
ters (and hence updates the outputs). Use of the LDAC function
enables double-buffering of the DAC data, GAIN, and BUF.
There are two LDAC modes:
Synchronous Mode: In this mode the DAC registers are
updated after new data is read in on the falling edge of the
16th SCLK pulse. LDAC can be tied permanently low or
pulsed as in Figure 2.
Asynchronous Mode: In this mode the outputs are not updated
at the same time that the input registers are written to. When
LDAC goes low, the DAC registers are updated with the con-
tents of the input register.
POWER-DOWN MODE
The AD5307/AD5317/AD5327 have low power consumption,
typically dissipating 1.2 mW with a 3 V supply and 2.5 mW
with a 5 V supply. Power consumption can be further reduced
when the DACs are not in use by putting them into power-
down mode, which is selected by taking pin PD low.
When the PD pin is high, all DACs work normally with a typical
power consumption of 500 µA at 5 V (400 µA at 3 V). However,
in power-down mode, the supply current falls to 300 nA at 5 V
(90 nA at 3 V) when all DACs are powered down. Not only
does the supply current drop, but the output stage is also internally
switched from the output of the amplifier making it open-circuit.
This has the advantage that the output is three-state while the part
is in power-down mode and provides a defined input condition for
whatever is connected to the output of the DAC amplifier. The
output stage is illustrated in Figure 11.
The bias generator, the output amplifiers, the resistor string, and
all other associated linear circuitry are shut down when the
power-down mode is activated. However, the contents of the
registers are unaffected when in power-down. In fact it is pos-
sible to load new data to the input registers and DAC registers
during power-down. The DAC outputs will update as soon as
PD goes high. The time to exit power-down is typically 2.5 µs
for V
DD
= 5 V and 5 µs when V
DD
= 3 V. This is the time from
the rising edge of PD to when the output voltage deviates from
its power-down voltage. See TPC 18 for a plot.
RESISTOR
STRING DAC
POWER-DOWN
CIRCUITRY
AMPLIFIER
V
OUT
Figure 11. Output Stage During Power-Down