EVAL-AD5501EBZ Analog Devices Inc, EVAL-AD5501EBZ Datasheet - Page 14

• Manufacturer Part Number: EVAL-AD5501EBZ
• Description: Evaluation Board I.c.
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD5501EBZ

• Number Of Dac's: 1
• Number Of Bits: 12
• Outputs And Type: 1, Single Ended
• Sampling Rate (per Second): 16M
• Data Interface: SPI™, QSPI™, MICROWIRE™, and DSP
• Settling Time: 45µs
• Dac Type: Voltage
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 105°C
• Utilized Ic / Part: AD5501
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD5501
changed, the voltage on the output pin remains the same until
the next write to the DAC register (and LDAC is brought low).
For example, if the user writes 0x800 to the DAC register when
in 30 V mode ( R_SEL = 1), the output voltage is 15 V (assuming
LDAC is low or has been pulsed low). When the user switches
to 60 V mode ( R_SEL = 0), the output stays at 15 V until the
user writes a new value to the DAC register. LDAC must be low
or be pulsed low for the output to change.
CLR FUNCTION
The AD5501 has a hardware CLR pin that is an asynchronous
clear input. The CLR input is falling edge sensitive. Bringing the
CLR line low clears the contents of the input register and the
DAC registers to 0x000. The CLR pulse activation time, that is,
the falling edge of CLR to when the output starts to change, is
typically 100 ns.
LDAC FUNCTION
The DAC output can be updated using the hardware LDAC pin.
LDAC is normally high. On the falling edge of LDAC , data is
copied from the input register to the DAC register and the DAC
output is updated (asynchronous update mode, see
the
SCLK, the DAC register and DAC output are updated
automatically when new data is received in the input register
(synchronous update mode, see
LDAC is kept low or is low on the falling edge of the 16
Figure 3
).
Figure 3
th
). If
Rev. A | Page 14 of 20
TEMPERATURE SENSOR
The AD5501 has an integrated temperature sensor, which causes
the part to enter thermal shutdown mode when the temperature
on the die exceeds 110°C. In thermal shutdown mode, the analog
section of the device powers down and the DAC output is
disconnected but the digital section remains operational, which
is equivalent to setting the power-down bit in the control
register. To indicate that the AD5501 has entered temperature
shutdown mode, Bit 0 of the control register is set to 1 and the
ALARM pin goes low. The AD5501 remains in temperature
shutdown mode with Bit 0 set to 1 and the ALARM pin low,
even if the die temperature falls, until Bit 0 in the control
register is cleared to 0.
POWER DISSIPATION
Drawing current from the V
the die and package of the AD5501. The package junction
temperature (T
operation. If the die temperature exceeds 110°C, the AD5501
enters thermal shutdown mode as described in the previous
section. The amount of heat generated can be calculated using
the formula
where:
T
T
P
θ
Absolute Maximum Ratings section for this value).
POWER SUPPLY SEQUENCING
The power supplies for the AD5501 can be applied in any order
without affecting the device. However, before the power
supplies are applied, connect the AGND and DGND pins to the
relevant ground plane. Do not allow any of the digital input pins
(SCLK, SDI, SYNC , R_SEL , and CLR ) to float during power up.
The digital input pins can be connected to pull-up (to V
pull-down (to DGND) resistors as required.
JA
TOTAL
J
A
is the package junction temperature.
is the ambient temperature.
is the thermal impedance of the AD5501 package (see the
T
J
is the total power being consumed by the AD5501.
= T
A
+ ( P
J
) should not exceed 130°C for normal
TOTAL
× θ
JA
)
OUT
pin causes a temperature rise in
LOGIC
) or