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AD5932 Datasheet(PDF) 9 Page - Analog Devices

Part No. AD5932
Description  Programmable Frequency Scan Waveform Generator
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD5932 Datasheet(HTML) 9 Page - Analog Devices

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Data Sheet
AD5932
Rev. C | Page 9 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
TOP VIEW
(Not to Scale)
1
2
3
4
5
6
7
8
AD5932
16
15
14
13
12
11
10
9
AVDD
DVDD
CAP/2.5V
SYNCOUT
MCLK
DGND
COMP
AGND
STANDBY
FSYNC
CTRL
MSBOUT
INTERRUPT
SDATA
SCLK
VOUT
Figure 7. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
COMP
DAC Bias Pin. This pin is used for decoupling the DAC bias voltage to AVDD.
2
AVDD
Positive Power Supply for the Analog Section. AVDD can have a value from 2.3 V to 5.5 V. A 0.1 µF decoupling
capacitor should be connected between AVDD and AGND.
3
DVDD
Positive Power Supply for the Digital Section. DVDD can have a value from 2.3 V to 5.5 V. A 0.1 µF decoupling
capacitor should be connected between DVDD and DGND.
4
CAP/2.5V
Digital Circuitry. Operates from a 2.5 V power supply. This 2.5 V is generated from DVDD using an on-board
regulator. The regulator requires a decoupling capacitor of typically 100 nF, which is connected from CAP/2.5V
to DGND. If DVDD is equal to or less than 2.7 V, CAP/2.5V can be shorted to DVDD.
5
DGND
Ground for All Digital Circuitry.
6
MCLK
Digital Clock Input. DDS output frequencies are expressed as a binary fraction of the frequency of MCLK.
The output frequency accuracy and phase noise are determined by this clock.
7
SYNCOUT
Digital Output for Scan Status Information. User-selectable for end of scan (EOS) or frequency increments through
the control register (SYNCOP bit). This pin must be enabled by setting the SYNCOUTEN bit in the control register to 1.
8
MSBOUT
Digital Output. The inverted MSB of the DAC data is available at this pin. This output pin must be enabled by
setting the MSBOUTEN bit in the control register to 1.
9
INTERRUPT
Digital Input. This pin acts as an interrupt during a frequency scan. A low-to-high transition is sampled by the
internal MCLK, which resets internal state machines. This results in the DAC output going to midscale.
10
CTRL
Digital Input. Triple function pin for initialization, start, and external frequency increments. A low-to-high
transition, sampled by the internal MCLK, is used to initialize and start internal state machines, which then execute
the pre-programmed frequency scan sequence. When in auto-increment mode, a single pulse executes the entire
scan sequence. When in external increment mode, each frequency increment is triggered by low-to-high
transitions.
11
SDATA
Serial Data Input. The 16-bit serial data-word is applied to this input with the register address first, followed by
the MSB to LSBs of the data.
12
SCLK
Serial Clock Input. Data is clocked into the AD5932 on each falling SCLK edge.
13
FSYNC
Active Low Control Input. This is the frame synchronization signal for the serial data. When FSYNC is taken low,
the internal logic is informed that a new word is being loaded into the device.
14
STANDBY
Active High Digital Input. When this pin is high, the internal MCLK is disabled, and the reference DAC and regulator
are powered down. For optimum power saving, it is recommended that the AD5932 be reset before it is put into
standby, as this results in a shutdown current of typically 20 µA.
15
AGND
Ground for All Analog Circuitry.
16
VOUT
Voltage Output. The analog outputs from the AD5932 are available here. An external resistive load is not required,
because the device has a 200 Ω resistor on board. A 20 pF capacitor to AGND is recommended to act as a low-pass
filter and to reduce clock feedthrough.


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