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AD5025 Fiches technique(PDF) 9 Page - Analog Devices

No de pièce AD5025
Description  Fully Accurate 12-/14-/16-Bit VOUT DAC SPI Interface 2.7 V to 5.5 V in a TSSOP
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

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Preliminary Technical Data
AD5025/45/65
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
2
3
4
5
6
7
AD5065/45/35
13
12
11
10
9
8
GND
VOUTB
K
TOP VIEW
(Not to Scale)
PDL
SCL
CLR
VrefB
14
DIN
LDAC
SYNC
VDD
VrefA
VOUTA
POR
SDO
Figure 5. 14-Lead TSSOP (RU-14)
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
LDAC
Pulsing this pin low allows any or all DAC registers to be updated if the input registers
have new data. This allows all DAC outputs to simultaneously update. Alternatively, this
pin can be tied permanently low.
2
Active Low Control Input. This is the frame synchronization signal for the input data.
When SYNC goes low, it powers on the SCLK and DIN buffers and enables the input
shift register. Data is transferred in on the falling edges of the next 32 clocks. If SYNC is
taken high before the 32nd falling edge, the rising edge of SYNC acts as an interrupt
and the write sequence is ignored by the device.
3
SYNC
Power Supply Input. These parts can be operated from 2.7 V to 5.5 V, and the supply
should be decoupled with a 10 μF capacitor in parallel with a 0.1 μF capacitor to
GND.
4
VDD
Dac A reference input .This is the reference voltage input pin for Dac A.
5
VREFA
Analog Output Voltage from DAC A. The output amplifier has rail-to-rail operation.
6
VOUTA
POR
Power-on Reset Pin. Tying this pin to GND powers up the part to 0 V. Tying this pin to
VDD powers up the part to midscale.
7
SDO
Serial Data Output. Can be used for daisy-chaining a number of these devices
together or for reading back the data in the shift register for diagnostic purposes. The
serial data is transferred on the rising edge of SCLK and is valid on the falling edge of
the clock.
8
Asynchronous Clear Input. The CLR input is falling edge sensitive. When CLR is low,
all LDAC pulses are ignored. When CLR is activated, the input register and the DAC
register are updated with the data contained in the CLR code register—zero,
midscale, or full scale. Default setting clears the output to 0 V.
9
CLR
Dac B reference input .This is the reference voltage input pin for Dac B.
10
VREFB
Analog Output Voltage from DAC B. The output amplifier has rail-to-rail operation.
11
VOUTB
GND
Ground Reference Point for All Circuitry on the Part.
12
PDL
The PDL pin is used to ensure hardware shutdown lockout of the device under any
circumstance. A Logic 1 at the PLO pin will cause the device to behave as normal.
The user may successfully enter software power down over the serial interface while
logic 1 is applied to the PDL pin.
If a logic 0 is applied to this pin, it will ensure that the device cannot enter software
power down under any circumstances. If the device had previously been placed in
software power down mode, a high to low transition at the PDL pin will cause the
DAC(s) to exit power down and the output the last code in the dac register before
the device entered software power down.
13
DIN
Serial Data Input. This device has a 32-bit shift register. Data is clocked into the
register on the falling edge of the serial clock input.
14
SCLK
Serial Clock Input. Data is clocked into the input shift register on the falling edge of the
serial clock input. Data can be transferred at rates of up to 50 MHz.
Rev. PrB | Page 9 of 3
3


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