AD5452YRMZ Analog Devices Inc, AD5452YRMZ Datasheet - Page 22

• Manufacturer Part Number: AD5452YRMZ
• Description: IC DAC 12BIT MULT 50MHZ 8-MSOP
• Manufacturer: Analog Devices Inc

Specifications of AD5452YRMZ

• Data Interface: Serial
• Design Resources: Unipolar, Precision DC Digital-to-Analog Conversion using AD5450/1/2/3 8-14-Bit DACs (CN0052) Precision, Bipolar, Configuration for AD5450/1/2/3 8-14bit Multiplying DACs (CN0053) AC Signal Processing Using AD5450/1/2/3 Current Output DACs (CN0054) Programmable Gain Element Using AD5450/1/2/3 Current Output DAC Family (CN0055) Single Supply Low Noise LED Current Source Driver Using a Current Output DAC in the Reverse Mode (CN0139)
• Settling Time: 110ns
• Number Of Bits: 12
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 55µW
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Resolution (bits): 12bit
• Sampling Rate: 2.7MSPS
• Input Channel Type: Serial
• Supply Voltage Range - Analogue: 2.5V To 5.5V
• Supply Current: 400nA
• Digital Ic Case: RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD5450/AD5451/AD5452
If the user wants to verify the data previously written to the
input shift register, the SDO line can be connected to MISO of
the MC68HC11. In this configuration with SYNC low, the shift
register clocks data out upon the rising edges of SCLK.
MICROWIRE-to-AD5450/AD5451/AD5452 Interface
Figure 55 shows an interface between the DAC and any
MICROWIRE-compatible device. Serial data is shifted out
upon the falling edge of the serial clock, SK, and is clocked in
the DAC input shift register upon the rising edge of SK, which
corresponds to the falling edge of the DAC’s SCLK.
PIC16C6x/7x-to-AD5450/AD5451/AD5452 Interface
The PIC16C6x/7x synchronous serial port (SSP) is configured
as an SPI master with the clock polarity bit (CKP) = 0. This is
done by writing to the synchronous serial port control register
(SSPCON); see the PIC16/17 Microcontroller User Manual.
In this example, I/O Port RA1 is used to provide a SYNC signal
and enable the serial port of the DAC. This microcontroller
transfers only eight bits of data during each serial transfer
operation; therefore, two consecutive write operations are
required. Figure 56 shows the connection diagram.
PCB LAYOUT AND POWER SUPPLY DECOUPLING
In any circuit where accuracy is important, careful consideration
of the power supply and ground return layout helps to ensure
the rated performance. The printed circuit board on which the
AD5450/AD5451/AD5452 is mounted should be designed so
that the analog and digital sections are separated and confined
to certain areas of the board. If the DAC is in a system where
multiple devices require an AGND-to-DGND connection, the
connection should be made at one point only. The star ground
point should be established as close as possible to the device.
*ADDITIONAL PINS OMITTED FOR CLARITY
*ADDITIONAL PINS OMITTED FOR CLARITY
MICROWIRE*
PIC16C6x/7x**
Figure 56. PIC16C6x/7x-to-AD5450/AD5451/AD5452 Interface
Figure 55. MICROWIRE-to-AD5450/AD5451/AD5452 Interface
SCK/RC3
SDI/RC4
RA1
SO
SK
CS
AD5450/AD5451/
AD5450/AD5451/
SCLK
SDIN
SYNC
SCLK
SDIN
SYNC
AD5452*
AD5452*
Rev. 0 | Page 22 of 28
These DACs should have ample supply bypassing of 10 µF in
parallel with 0.1 µF on the supply located as close to the package
as possible, ideally right up against the device. The 0.1 µF
capacitor should have low effective series resistance (ESR) and
effective series inductance (ESI), like the common ceramic
types that provide a low impedance path to ground at high
frequencies, to handle transient currents due to internal logic
switching. Low ESR 1 µF to 10 µF tantalum or electrolytic
capacitors should also be applied at the supplies to minimize
transient disturbance and filter out low frequency ripple.
Components that produce fast switching signals, such as clocks,
should be shielded with a digital ground to avoid radiating
noise to other parts of the board, and they should never be run
near the reference inputs.
Avoid crossover of digital and analog signals. Traces on
opposite sides of the board should run at right angles to each
other. This reduces the effects of feedthrough through the
board. A microstrip technique is the best solution, but its use is
not always possible with a double-sided board. In this
technique, the component side of the board is dedicated to
ground plane, while signal traces are placed on the solder side.
It is good practice to employ compact, minimum lead length
PCB layout design. Leads to the input should be as short as
possible to minimize IR drops and stray inductance.
The PCB metal traces between V
matched to minimize gain error. To optimize high frequency
performance, the I-to-V amplifier should be located as close to
the device as possible.
EVALUATION BOARD FOR THE DAC
The evaluation board consists of an AD5450, AD5451 or
AD5452 DAC and a current-to-voltage amplifier, such as an
AD8065. Included on the evaluation board is a 10 V reference,
an ADR01. An external reference can also be applied via an
SMB input.
The evaluation kit consists of a CD with PC software to control
the DAC. The software allows the user to write code to the device.
POWER SUPPLIES FOR THE EVALUATION BOARD
The board requires ±12 V and +5 V supplies. The +12 V V
and V
to power the DAC (V
Both supplies are decoupled to their respective ground plane
with 10 µF tantalum and 0.1 µF ceramic capacitors.
SS
are used to power the output amplifier; the +5 V is used
DD1
) and transceivers (V
REF
and R
FB
should also be
CC
).
DD