Analog Devices AD5932 pra Datasheet

Programmable Single-Scan

Preliminary Technical Data

FEATURES

Programmable frequency profile—no external components

necessary
Ouput frequency up to 25 Mhz
Predefined frequency profile minimizes number of

DSP/µcontroller writes
Sinusoidal/triangular/square wave outputs
Powerdown mode (20 µA)
+2.3 V to +5.5 V power supply
Extended temperature range −40°C to +105°C
16-pin TSSOP

APPLICATIONS

Frequency Scan
Network/Impedance Measurements
Incremental Frequency stimulus
Sensory Applications—Proximity and Motion
BFSK

Waveform Generator

AD5932*

GENERAL DESCRIPTION

The AD5932 is a waveform generator providing a
programmable frequency scan. Utilizing embedded digital
processing allowing enhanced frequency control the device
generates synthesized analog or digital frequency-stepped
waveforms. Because frequency profiles are preprogrammed
continuous write cycles are eliminated, thereby freeing up
valuable DSP/µController resources. Waveforms start from a
known phase and are incremented phase continuously allowing
phase shifts to be easily determined. Consuming only 8mA the
AD5932 provides a convenient low power solution to waveform
generation.

To program the device, the user enters the start frequency, the
increment step size, the number of increments to be made and
the time interval the part stays at each frequency. The frequency
profile can be initiated by toggling the CTRL pin.

(continued on Page 3)

FUNCTIONAL BLOCK DIAGRAM

CAP/2.5VDVDD

REGULATOR

MCLK

CTRL

FSYNC

*Protected by US Patent Number 6747583, other patents pending

INCREMENT

CONTROLLER

DATA

FREQUENCY

CONTROLLER

DATA

SERIAL INTERFACE

SCLK SDATA

DGND

VCC

2.5V

INCR

& CONTROL

SYNC

INTERUPT

24

CONTROL
REGISTER

Figure 1.

STANDBY

ON-BOARD

REFERENCE

AVDDAGND

BUFFER

BUFFER

10-BIT

DAC

FULL-SCALE

CONTROL

SYNC OUT

MSB OUT

VOUT

COMP

Rev. PrA 02/05

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AD5932 Preliminary Technical Data

TABLE OF CONTENTS

General Description ......................................................................... 3

Outputs from the AD5932 ........................................................ 10

Specifications..................................................................................... 4

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configurations And Functional Descriptions ....................... 7

Terminology ...................................................................................... 8

detailed operation............................................................................. 9

Functional Description................................................................ 9

REVISION HISTORY

Revision PrA: Preliminary Version

Programming the AD5932........................................................ 10

Setting up the Scan..................................................................... 12

Activating and controlling the Scan ..... Error! Bookmark not

defined.

Outline Dimensions....................................................................... 14

Ordering Guide .......................................................................... 14

Rev. PrA | Page 2 of 15

Preliminary Technical Data AD5932

GENERAL DESCRIPTION

(continued from Page 1)

A number of different scan profiles are offered. The user can
choose to output the last frequency in the scan continuously, or
can choose to return to midscale.

The AD5932 is written to via a 3-wire serial interface, which
operates at clock rates up to 40 MHz. The device operates with a

power supply from 2.3 V to 5.5 V and has a standby function
which allows sections of the device that are not being used to be
powered down.

The AD5932 is available in a 16-pin TSSOP package.

Rev. PrA | Page 3 of 15

AD5932 Preliminary Technical Data

SPECIFICATIONS

A

= D

V

DD

Y Grade1
Parameter

SIGNAL DAC SPECIFICATIONS

Resolution 10 Bits
Update Rate 50 MSPS
Vout peak-to-peak 0.6 V
Vout offset 30 mV From 0V to the trough of the waveform
Vout TC 200 ppm/°C
DC Accuracy:
Integral Nonlinearity (INL) ±1 LSB
Differential nonlinearity (DNL) ±0.5 LSB

DDS SPECIFICATIONS

Dynamic Specifications:

Signal to Noise Ratio 55 60 dB
Total Harmonic Distortion −66 −56 dBc
Spurious Free Dynamic Range

(SFDR):

Clock Feedthrough −50 dBc
Wake Up Time 1 ms

OUTPUT BUFFER

Vout peak-to peak D
Output Rise/Fall Time 12 ns
Output Jitter 120 ps rms When DAC data MSB is output

VOLTAGE REFERENCE

Internal Reference 1.12 1.18 1.24 V
Reference TC 100 ppm/°C

LOGIC INPUTS

Input current 10 µA
V

INH

2.0 V Vdd = 2.7 V to 5.5 V
V

INL

0.8 V Vdd = 2.7 V to 5.5 V
CIN, input capacitance

not defined.

LOGIC OUTPUTS

V

OHL

VOL, output low voltage 0.4 V I
Floating-state O/P capacitance 8 pF

POWER REQUIREMENTS

AVDD/DVDD 2.3 5.5 V
IAA 3.8 5 MA
IDD 2.0 3 mA
IAA + IDD 5.8 8 mA
Low Power Sleep Mode 20 µA

1

Operating temperature range is as follows: Y Version: −40°C to + 105°C; typical specifications are at 25°C.

= +2.3 V to +5.5 V; AGND = DGND = 0 V; TA = T

V

DD

MIN

to T

; unless otherwise noted.

MAX

Table 1.

Min Typ Max

Unit Test Conditions/Comments

= 50 MHz, f

f

MCLK

= 50 MHz, f

f

MCLK

OUT

OUT

Wideband (0 to Nyquist) −60 −56 dBc

NarrowBand (± 200 kHz) −78 −67 dBc

V Squarewave on MSB OUT

VDD

= 50 MHz, f

f

MCLK

= 50 MHz, f

f

MCLK

OUT

OUT

, input high voltage 1.7 V Vdd = 2.3 V to 2.7 V

, input low voltage 0.7 V Vdd = 2.3 V to 2.7 V

Error! Bookmark

3 pF

, output high voltage D

− 0.8 V V I

VDD

= 1 mA

SINK

= 1 mA

SINK

= 50 MHz, f

f

MCLK

OUT

All outputs powered down, MCLK =0MHz, Serial interface
active

= f
= f

= f
= f

= f

MCLK

MCLK

MCLK

MCLK

MCLK

/4096
/4096

/50
/50

/7

Rev. PrA | Page 4 of 15

Preliminary Technical Data AD5932

Rev. PrA | Page 5 of 15