Analog Devices AD5380 Datasheet

40-Channel, 3 V/5 V, Single-Supply,

FEATURES

Guaranteed monotonic
INL error: ±4 LSB max
On-chip 1.25 V/2.5 V, 10 ppm/°C reference
Temperature range: –40°C to +85°C
Rail-to-rail output amplifier
Power down
Package type: 100-lead LQFP (14 mm × 14 mm)
User Interfaces:

Parallel
Serial (SPI®/QSPI™/MICROWIRE™/DSP compatible,

featuring data readback)

I2C® compatible

DVDD (×3) DGND (×3) AVDD (×5) AGND (×5) DAC GND (×5) REFGND REFOUT/REFIN SIGNAL GND (×5)

SER/PAR

FIFO EN

CS/(SYNC/AD 0)

WR/(DCEN/AD 1)

SDO

DB13/(DIN/SDA)

DB12/(SCLK/SCL)

DB11/(SPI/I2C)

DB10

DB0

REG 0

REG 1

RESET

BUSY

CLR

PD

A5
A0

INTERFACE

CONTROL

POWER-ON

V

0………V

OUT

AD5380

LOGIC

RESET

39-TO-1

MUX

OUT

FIFO

+

STATE

MACHINE

+

CONTROL

LOGIC

38

14-Bit, Voltage Output DAC

INTEGRATED FUNCTIONS

Channel monitor
Simultaneous output update via

Clear function to user programmable code
Amplifier boost mode to optimize slew rate
User programmable offset and gain adjust
Toggle mode enables square wave generation
Thermal monitor

APPLICATIONS

Variable optical attenuators (VOA)
Level setting (ATE)
Optical micro-electro-mechanical systems (MEMS)
Control systems
Instrumentation

FUNCTIONAL BLOCK DIAGRAM

INPUT
REG 0

14
14

INPUT
REG 1

14
14

INPUT
REG 6

14
14

INPUT
REG 7

14
14

m REG 0

c REG 0

m REG 1

c REG 1

m REG 6

c REG 6

m REG 7

c REG 7

×5

DAC

REG 0

DAC

REG 1

DAC

REG 6

DAC

REG 7

1.25V/2.5V

REFERENCE

1414 1414

DAC 0

1414 1414

DAC 1

1414 1414

DAC 6

1414 1414

DAC 7

LDAC

R

R

R

R

R

R

R

R

AD5380

VOUT

VOUT1
VOUT2
VOUT3
VOUT4
VOUT5
VOUT6

VOUT7
VOUT8

VOUT38

VOUT 39/MON_OUT LDAC

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.

Figure 1.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

03731-0-001

AD5380

TABLE OF CONTENTS

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

BUSY

and

Functions...................................................... 25

LDAC

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

AD5380-5 Specifications............................................................. 4

AD5380-3 Specifications............................................................. 6

AC Characteristics........................................................................ 7

Timing Characteristics..................................................................... 8

Serial Interface ..............................................................................8

I2C Serial Interface...................................................................... 10

Parallel Interface .........................................................................11

Absolute Maximum Ratings.......................................................... 13

Pin Configurations and Function Descriptions......................... 14

Terminology ....................................................................................17

Typical Performance Characteristics ...........................................18

Functional Description.................................................................. 21

DAC Architecture—General..................................................... 21

Data Decoding............................................................................ 21

FIFO Operation in Parallel Mode............................................ 25

Power-On Reset.......................................................................... 25

Power-Down ............................................................................... 25

AD5380 Interfaces.......................................................................... 26

DSP, SPI, Microwire Compatible Serial Interfaces................. 26

I2C Serial Interface ..................................................................... 28

Parallel Interface......................................................................... 30

Microprocessor Interfacing....................................................... 31

Application Information................................................................ 33

Power Supply Decoupling......................................................... 33

Typical Configuration Circuit .................................................. 33

AD5380 Monitor Function .......................................................34

Toggle Mode Function............................................................... 34

Thermal Monitor Function....................................................... 35

AD5380 in a MEMS Based Optical Switch............................. 35

On-Chip Special Function Registers (SFR) ............................22

SFR Commands.......................................................................... 22

Hardware Functions....................................................................... 25

Reset Function ............................................................................25

Asynchronous Clear Function.................................................. 25

REVISION HISTORY

5/04—Revision 0: Initial Version

Optical Attenuators .................................................................... 36

Utilizing the AD5380 FIFO....................................................... 37

Outline Dimensions....................................................................... 38

Ordering Guide .......................................................................... 38

Rev. 0 | Page 2 of 40

AD5380

GENERAL DESCRIPTION

The AD5380 is a complete, single-supply, 40-channel, 14-bit
DAC available in a 100-lead LQFP package. All 40 channels
have an on-chip output amplifier with rail-to-rail operation.
The AD5380 includes a programmable internal 1.25 V/2.5 V,
10 ppm/°C reference, an on-chip channel monitor function that
multiplexes the analog outputs to a common MON_OUT pin
for external monitoring, and an output amplifier boost mode
that allows optimization of the amplifier slew rate. The AD5380
contains a double-buffered parallel interface that features a
20 ns

pulse width, an SPI/QSPI/MICROWIRE/DSP

WR

compatible serial interface with interface speeds in excess of

2

30 MHz, and an I

C compatible interface that supports a

400 kHz data transfer rate.

Table 1. Other High Channel Count, Low Voltage, Single Supply DACs in Portfolio

Model Resolution AVDD Range Output Channels Linearity Error (LSB) Package Description Package Option

AD5381BST-5 12 Bits 4.5 V to 5.5 V 40 ±1 100-Lead LQFP ST-100
AD5381BST-3 12 Bits 2.7 V to 3.6 V 40 ±1 100-Lead LQFP ST-100
AD5384BBC-5 14 Bits 4.5 V to 5.5 V 40 ±4 100-Lead CSPBGA BC-100
AD5384BBC-3 14 Bits 2.7 V to 3.6 V 40 ±4 100-Lead CSPBGA BC-100
AD5382BST-5 14 Bits 4.5 V to 5.5 V 32 ±4 100-Lead LQFP ST-100
AD5382BST-3 14 Bits 2.7 V to 3.6 V 32 ±4 100-Lead LQFP ST-100
AD5383BST-5 12 Bits 4.5 V to 5.5 V 32 ±1 100-Lead LQFP ST-100
AD5383BST-3 12 Bits 2.7 V to 3.6 V 32 ±1 100-Lead LQFP ST-100
AD5390BST-5 14 Bits 4.5 V to 5.5 V 16 ±3 52-Lead LQFP ST-52
AD5390BCP-5 14 Bits 4.5 V to 5.5 V 16 ±3 64-Lead LFCSP CP-64
AD5390BST-3 14 Bits 2.7 V to 3.6 V 16 ±3 52-Lead LQFP ST-52
AD5390BCP-3 14 Bits 2.7 V to 3.6 V 16 ±3 64-Lead LFCSP CP-64
AD5391BST-5 12 Bits 4.5 V to 5.5 V 16 ±1 52-Lead LQFP ST-52
AD5391BCP-5 12 Bits 4.5 V to 5.5 V 16 ±1 64-Lead LFCSP CP-64
AD5391BST-3 12 Bits 2.7 V to 3.6 V 16 ±1 52-Lead LQFP ST-52
AD5391BCP-3 12 Bits 2.7 V to 3.6 V 16 ±1 64-Lead LFCSP CP-64
AD5392BST-5 14 Bits 4.5 V to 5.5 V 8 ±3 52-Lead LQFP ST-52
AD5392BCP-5 14 Bits 4.5 V to 5.5 V 8 ±3 64-Lead LFCSP CP-64
AD5392BST-3 14 Bits 2.7 V to 3.6 V 8 ±3 52-Lead LQFP ST-52
AD5392BCP-3 14 Bits 2.7 V to 3.6 V 8 ±3 64-Lead LFCSP CP-64

Table 2. 40-Channel, Bipolar Voltage Output DAC

Model Resolution Analog Supplies Output Channels Linearity Error (LSB) Package Package Option

AD5379ABC 14 Bits ±11.4 V to ±16.5 V 40 ±3 108-Lead CSPBGA BC-108

An input register followed by a DAC register provides double
buffering, allowing the DAC outputs to be updated indepen­dently or simultaneously using the

LDAC

input.

Each channel has a programmable gain and offset adjust
register that allows the user to fully calibrate any DAC chan­nel. Power consumption is typically 0.25 mA/channel with
boost off.

Rev. 0 | Page 3 of 40

AD5380

SPECIFICATIONS

AD5380-5 SPECIFICATIONS

Table 3 . AVDD = 4.5 V to 5.5 V; DVDD = 2.7 V to 5.5 V, AGND = DGND = 0 V; External REFIN = 2.5 V;
all specifications T

MIN

to T

Parameter AD5380-51 Unit Test Conditions/Comments

ACCURACY

Resolution 14 Bits

Relative Accuracy2 (INL) ±4 LSB max ±1 LSB typical

Differential Nonlinearity (DNL) –1/+2 LSB max Guaranteed monotonic by design over temperature

Zero-Scale Error 4 mV max

Offset Error ±4 mV max Measured at code 32 in the linear region

Offset Error TC ±5 µV/°C typ

Gain Error ±0.024 % FSR max At 25°C

±0.06 % FSR max T

Gain Temperature Coefficient3 2 ppm FSR/°C typ

DC Crosstalk3 0.5 LSB max
REFERENCE INPUT/OUTPUT

Reference Input3

Reference Input Voltage 2.5 V ±1% for specified performance, AVDD = 2 × REFIN + 50 mV
DC Input Impedance 1 MΩ min Typically 100 MΩ
Input Current ±1 µA max Typically ±30 nA
Reference Range 1 to VDD/2 V min/max

Reference Output4

Output Voltage 2.495/2.505 V min/max At ambient. CR12 = 1. Optimized for 2.5 V operation.

1.22/1.28 V min/max CR12 = 0
Reference TC ±10 ppm/°C max Temperature range: +25°C to +85°C

±15 ppm/°C max Temperature range: −40°C to +85°C

Output Impedance 2.2 kΩ typ

OUTPUT CHARACTERISTICS3

Output Voltage Range2 0/AVDD V min/max
Short-Circuit Current 40 mA max
Load Current ±1 mA max
Capacitive Load Stability

RL = ∞ 200 pF max
RL = 5 kΩ 1000 pF max

DC Output Impedance 0.5 Ω max

MONITOR PIN

Output Impedance 500 Ω typ
Three-State Leakage Current 100 nA typ

LOGIC INPUTS (EXCEPT SDA/SCL)3 DVDD = 2.7 V to 5.5 V

VIH, Input High Voltage 2 V min
VIL, Input Low Voltage 0.8 V max
Input Current ±10 µA max Total for all pins. TA = T
Pin Capacitance 10 pF max

LOGIC INPUTS (SDA, SCL ONLY)

VIH, Input High Voltage 0.7 DVDD V min SMBus compatible at DVDD< 3.6 V
VIL, Input Low Voltage 0.3 DVDD V max SMBus compatible at DVDD< 3.6 V
IIN, Input Leakage Current ±1 µA max
V

, Input Hysteresis 0.05 DVDD V min

HYST

CIN, Input Capacitance 8 pF typ
Glitch Rejection 50 ns max Input filtering suppresses noise spikes of less than 50 ns

, unless otherwise noted

MAX

to T

MAX

MIN

Enabled via CR10 in the AD5380 control register.
CR12 selects the reference voltage.

to T

MAX

MIN

Rev. 0 | Page 4 of 40

AD5380

Parameter AD5380-51 Unit Test Conditions/Comments

LOGIC OUTPUTS (BUSY, SDO)3

VOL, Output Low Voltage 0.4 V max DVDD = 5 V ± 10%, sinking 200 µA
VOH, Output High Voltage DVDD – 1 V min DVDD = 5 V ± 10%, sourcing 200 µA
VOL, Output Low Voltage 0.4 V max DVDD = 2.7 V to 3.6 V, sinking 200 µA
VOH, Output High Voltage DVDD – 0.5 V min DVDD = 2.7 V to 3.6 V, sourcing 200 µA
High Impedance Leakage Current ±1 µA max SDO only
High Impedance Output Capacitance 5 pF typ SDO only

LOGIC OUTPUT (SDA)3

VOL, Output Low Voltage 0.4 V max I

0.6 V max I

Three-State Leakage Current ±1 µA max
Three-State Output Capacitance 8 pF typ

POWER REQUIREMENTS

AVDD 4.5/5.5 V min/max
DVDD 2.7/5.5 V min/max
Power Supply Sensitivity3

∆Mid Scale/∆ΑVDD –85 dB typ

AIDD 0.375 mA/channel max Outputs unloaded, Boost off. 0.25 mA/channel typ

0.475 mA/channel max Outputs unloaded, Boost on. 0.325 mA/channel typ
DIDD 1 mA max VIH = DVDD, VIL = DGND
AIDD (Power-Down) 2 µA max Typically 200 nA
DIDD (Power-Down) 20 µA max Typically 3 µA
Power Dissipation 80 mW max Outputs unloaded, Boost off, AVDD = DVDD = 5 V

1

AD5380-5 is calibrated using an external 2.5 V reference. Temperature range for all versions: –40°C to +85°C.

2

Accuracy guaranteed from V

3

Guaranteed by characterization, not production tested.

4

Default on the AD5380-5 is 2.5 V. Programmable to 1.25 V via CR12 in the AD5380 control register; operating the AD5380-5 with a 1.25 V reference will lead to

degraded accuracy specifications.

= 10 mV to AVDD – 50 mV.

OUT

= 3 mA

SINK

= 6 mA

SINK

Rev. 0 | Page 5 of 40

AD5380

AD5380-3 SPECIFICATIONS

Table 4 . AVDD = 2.7 V to 3.6 V; DVDD = 2.7 V to 5.5 V, AGND = DGND = 0 V; external REFIN = 1.25 V;
all specifications T

MIN

to T

Parameter AD5380-31 Unit Test Conditions/Comments

ACCURACY

Resolution 14 Bits
Relative Accuracy2 (INL) ±4 LSB max
Differential Nonlinearity (DNL) –1/+2 LSB max Guaranteed monotonic over temperature
Zero-Scale Error 4 mV max
Offset Error ±4 mV max Measured at Code 64 in the linear region
Offset Error TC ±5 µV/°C typ
Gain Error ±0.024 % FSR max At 25°C
±0.06 % FSR max T
Gain Temperature Coefficient3 2 ppm FSR/°C typ
DC Crosstalk3 0.5 LSB max

REFERENCE INPUT/OUTPUT

Reference Input3

Reference Input Voltage 1.25 V ±1% for specified performance
DC Input Impedance 1 MΩ min Typically 100 MΩ
Input Current ±1 µA max Typically ±30 nA
Reference Range 1 to AVDD/2 V min/max

Reference Output4

Output Voltage 1.247/1.253 V min/max At ambient. CR12 = 0. Optimized for 1.25 V operation.

2.43/2.57 V min/max CR12 = 1.
Reference TC ±10 ppm/°C max Temperature range: +25°C to +85°C

±15 ppm/°C max Temperature range: −40°C to +85°C

Output Impedance 2.2 kΩ typ

OUTPUT CHARACTERISTICS3

Output Voltage Range2 0/AVDD V min/max
Short-Circuit Current 40 mA max
Load Current ±1 mA max
Capacitive Load Stability

RL = ∞ 200 pF max
RL = 5 kΩ 1000 pF max

DC Output Impedance 0.5 Ω max

MONITOR PIN

Output Impedance 500 Ω typ
Three-State Leakage Current 100 nA typ

LOGIC INPUTS (EXCEPT SDA/SCL)3 DVDD = 2.7 V to 3.6 V

VIH, Input High Voltage 2 V min
V

Input Low Voltage 0.8 V max

IL,

Input Current ±10 µA max Total for all pins. TA = T
Pin Capacitance 10 pF max

LOGIC INPUTS (SDA, SCL ONLY)

VIH, Input High Voltage 0.7 DVDD V min SMBus compatible at DVDD < 3.6 V
VIL, Input Low Voltage 0.3 DVDD V max SMBus compatible at DVDD < 3.6 V
IIN, Input Leakage Current ±1 µA max
V

, Input Hysteresis 0.05 DVDD V min

HYST

CIN, Input Capacitance 8 pF typ
Glitch Rejection 50 ns max Input filtering suppresses noise spikes of less than 50 ns

, unless otherwise noted

MAX

to T

MAX

MIN

Enabled via CR10 in the AD5380 control register.
CR12 selects the reference voltage.

to T

MAX

MIN

Rev. 0 | Page 6 of 40

AD5380

Parameter AD5380-31 Unit Test Conditions/Comments

LOGIC OUTPUTS (BUSY, SDO)3

VOL, Output Low Voltage 0.4 V max Sinking 200 µA
VOH, Output High Voltage DVDD – 0.5 V min Sourcing 200 µA
High Impedance Leakage Current ±1 µA max SDO only
High Impedance Output Capacitance 5 pF typ SDO only

LOGIC OUTPUT (SDA)3

VOL, Output Low Voltage 0.4 V max I

0.6 V max I

Three-State Leakage Current ±1 µA max
Three-State Output Capacitance 8 pF typ

POWER REQUIREMENTS

AVDD 2.7/3.6 V min/max
DVDD 2.7/5.5 V min/max
Power Supply Sensitivity3

∆Midscale/∆ΑVDD –85 dB typ

AIDD 0.375 mA/channel max Outputs unloaded, Boost off. 0.25 mA/channel typ

0.475 mA/channel max Outputs unloaded, Boost on. 0.325 mA/channel typ
DIDD 1 mA max VIH = DVDD, VIL = DGND.
AIDD (Power-Down) 2 µA max Typically 200 nA
DIDD (Power-Down) 20 µA max Typically 3 µA
Power Dissipation 48 mW max Outputs unloaded, Boost off, AVDD = DVDD = 3 V

1

AD5380-3 is calibrated using an external 1.25 V reference. Temperature range is –40°C to +85°C.

2

Accuracy guaranteed from V

3

Guaranteed by characterization, not production tested.

4

Default on the AD5380-3 is 1.25 V. Programmable to 2.5 V via CR12 in the AD5380 control register; operating the AD5380-3 with a 2.5 V reference will lead to degraded

accuracy specifications and limited input code range.

= 10 mV to AVDD – 50 mV.

OUT

= 3 mA

SINK

= 6 mA

SINK

AC CHARACTERISTICS1

Table 5 . AVDD = 2.7 V to 3.6 V and 4.5 V to 5.5 V; DVDD = 2.7 V to 5.5 V; AGND = DGND= 0 V

Parameter All Unit Test Conditions/Comments

DYNAMIC PERFORMANCE

Output Voltage Settling Time 2 1/4 scale to 3/4 scale change settling to ±1 LSB.

8 µs typ

10 µs max

Slew Rate2 2 V/µs typ Boost mode off, CR11 = 0

3 V/µs typ Boost mode on, CR11 = 1

Digital-to-Analog Glitch Energy 12 nV-s typ
Glitch Impulse Peak Amplitude 15 mV typ
Channel-to-Channel Isolation 100 dB typ See Terminology section
DAC-to-DAC Crosstalk 1 nV-s typ See Terminology section
Digital Crosstalk 0.8 nV-s typ
Digital Feedthrough 0.1 nV-s typ Effect of input bus activity on DAC output under test
Output Noise 0.1 Hz to 10 Hz 15 µV p-p typ External reference, midscale loaded to DAC
40 µV p-p typ Internal reference, midscale loaded to DAC
Output Noise Spectral Density

@ 1 kHz 150 nV/√Hz typ
@ 10 kHz 100 nV/√Hz typ

1

Guaranteed by design and characterization, not production tested.

2

The slew rate can be programmed via the current boost control bit (CR11 ) in the AD5380 control register.

Rev. 0 | Page 7 of 40

AD5380

T

TIMING CHARACTERISTICS

SERIAL INTERFACE

Tabl e 6. D VDD= 2.7 V to 5.5 V ; AVDD = 4.5 V to 5.5 V or 2.7 V to 3.6 V; AGND = DGND = 0 V; all specifications

to T

T

MIN

Parameter

t1 33 ns min SCLK cycle time
t2 13 ns min SCLK high time
t3 13 ns min SCLK low time
t4 13 ns min

t5 4 13 ns min

4

t

33 ns min

6

t7 10 ns min
t7A 50 ns min
t8 5 ns min Data setup time

t9 4.5 ns min Data hold time

4

t

30 ns max

10

t11 670 ns max

4

t

20 ns min

12

t13 20 ns min
t14 100 ns max
t15 0 ns min
t16 100 ns min
t17 8 µs typ DAC output settling time
t18 20 ns min
t

35 µs max

19

5

t

20 ns max SCLK rising edge to SDO valid

20

5

t

5 ns min

21

5

t

8 ns min

22

t23 20 ns min

, unless otherwise noted

MAX

1, 2, 3

Limit at T

MIN

, T

Unit Description

MAX

falling edge to SCLK falling edge setup time

SYNC

th

SCLK falling edge to SYNC falling edge

24
Minimum SYNC
Minimum SYNC
Minimum SYNC

24th SCLK falling edge to BUSY

pulse width low (single channel update)

BUSY
24th SCLK falling edge to LDAC

pulse width low

LDAC

rising edge to DAC output response time

BUSY

rising edge to LDAC falling edge

BUSY

falling edge to DAC output response time

LDAC

pulse width low

CLR

pulse activation time

CLR

SCLK falling edge to SYNC

rising edge to SCLK rising edge

SYNC

rising edge to LDAC falling edge

SYNC

low time
high time
high time in Readback mode

falling edge

falling edge

rising edge

1

Guaranteed by design and characterization, not production tested.

2

All input signals are specified with t

3

See Figure 2, Figure 3, Figure 4, and Figure 5.

4

Standalone mode only.

5

Daisy-chain mode only.

= t

= 5 ns (10% to 90% of VCC), and are timed from a voltage level of 1.2 V.

r

f

O OUTPUT PIN

Figure 2. Load Circuit for Digital Output Timing

C

L

50pF

200µA

200µA

I

OL

I

OH

Rev. 0 | Page 8 of 40

V

OH

V

OL

(MIN) OR

(MAX)

03731-0-003

AD5380

t

1

SCLK

t

3

t

4

t

SYNC

DIN

t

7

DB23

t8t

6

9

BUSY

1

LDAC

1

V

OUT

2

LDAC

2

V

OUT

t

18

CLR

V

OUT

1

LDAC ACTIVE DURING BUSY

2

LDAC ACTIVE AFTER BUSY

Figure 3. Serial Interface Timing Diagram (Standalone Mode)

t

2

t

5

DB0

t

10

t

11

t

t

19

t

12

13

t

15

24 48SCLK

t

7A

SYNC

2424

t

17

t

14

t

13

t

17

t

16

03731-0-004

DIN

SDO

SCLK

DB23 DB0 DB23 DB0

INPUT WORD SPECIFIES

REGISTER TO BE READ

NOP CONDITION

DB23 DB0

UNDEFINED

SELECTED REGISTER

DATA CLOCKED OUT

Figure 4. Serial Interface Timing Diagram (Data Readback Mode)

t

1

t

7

t

4

t

t

3

2

t

03731-0-005

4824

21

t

22

SYNC

t8t

9

DIN

DB23 DB0 DB0DB23

INPUT WORD FOR DAC N INPUT WORD FOR DAC N+1

t

20

SDO

UNDEFINED INPUT WORD FOR DAC N

LDAC

Figure 5. Serial Interface Timing Diagram (Daisy-Chain Mode)

DB23 DB0

t

13

t

23

03731-0-006

Rev. 0 | Page 9 of 40

AD5380

I2C SERIAL INTERFACE

Tabl e 7. D VDD = 2.7 V to 5.5 V; AVDD = 4.5 V to 5.5 V or 2.7 V to 3.6 V; AGND = DGND = 0 V; all specifications

to T

T

MIN

Parameter

F

400 kHz max SCL clock frequency

SCL

t1 2.5 µs min SCL cycle time
t2 0.6 µs min t
t3 1.3 µs min t
t4 0.6 µs min t
t5 100 ns min t

3

t

0.9 µs max t

6

0 µs min t
t7 0.6 µs min t
t8 0.6 µs min t
t9 1.3 µs min t
t10 300 ns max tR, rise time of SCL and SDA when receiving
0 ns min tR, rise time of SCL and SDA when receiving (CMOS compatible)
t11 300 ns max tF, fall time of SDA when transmitting
0 ns min tF, fall time of SDA when receiving (CMOS compatible)
300 ns max tF, fall time of SCL and SDA when receiving
20 + 0.1Cb 4 ns min tF, fall time of SCL and SDA when transmitting
Cb 400 pF max Capacitive load for each bus line

1

Guaranteed by design and characterization, not production tested.

2

See Figure 6.

3

A master device must provide a hold time of at least 300 ns for the SDA signal (referred to the V

falling edge.

4

Cb is the total capacitance, in pF, of one bus line. tR and tF are measured between 0.3 DVDD and 0.7 DVDD.

, unless otherwise noted

MAX

1, 2

Limit at T

MIN

, T

Unit Description

MAX

, SCL high time

HIGH

, SCL low time

LOW

, start/repeated start condition hold time

HD,STA

, data setup time

SU,DAT

, data hold time

HD,DAT

, data hold time

HD,DAT

, setup time for repeated start

SU,STA

, stop condition setup time

SU,STO

, bus free time between a STOP and a START condition

BUF

min of the SCL signal) in order to bridge the undefined region of SCL’s

IH

SDA

SCL

t

9

START

CONDITION

t

3

t

4

t

10

t

6

Figure 6. I

t

2

C Compatible Serial Interface Timing Diagram

t

11

2

t

5

REPEATED

CONDITION

t

7

START

t

4

t

1

t

8

STOP

CONDITION

03731-0-007

Rev. 0 | Page 10 of 40

AD5380

PARALLEL INTERFACE

Tabl e 8. D VDD = 2.7 V to 5.5 V; AVDD = 4.5 V to 5.5 V or 2.7 V to 3.6 V; AGND = DGND = 0 V; all specifications

to T

T

MIN

Parameter

t0 4.5 ns min
t1 4.5 ns min
t2 20 ns min
t3 20 ns min
t4 0 ns min
t5 0 ns min
t6 4.5 ns min
t7 4.5 ns min
t8 20 ns min

4

t

700 ns min

9

t10 30 ns max

4

t

670 ns max

11

t12 30 ns min
t13 20 ns min
t14 100 ns max
t15 20 ns min
t16 0 ns min
t17 100 ns min
t18 8 µs typ DAC output settling time

t19 20 ns min
t20 35 µsmax

1

Guaranteed by design and characterization, not production tested.

2

All input signals are specified with tR = tR = 5 ns (10% to 90% of DVDD) and timed from a voltage level of 1.2 V.

3

See Figure 7.

4

See Figure 29.

, unless otherwise noted

MAX

1,2,3

Limit at T

MIN

, T

Unit Description

MAX

REG0, REG1, address to WR
REG0, REG1, address to WR

pulse width low

CS

pulse width low

WR

to WR falling edge setup time

CS

to CS rising edge hold time

WR
Data to WR
Data to WR
WR

rising edge setup time
rising edge hold time

pulse width high

Minimum WR

rising edge to BUSY falling edge

WR

pulse width low (single-channel update)

BUSY

rising edge to LDAC falling edge

WR

pulse width low

LDAC

rising edge to DAC output response time

BUSY

rising edge to WR rising edge

LDAC

rising edge to LDAC falling edge

BUSY

falling edge to DAC output response time

LDAC

pulse width low

CLR

pulse activation time

CLR

rising edge setup time
rising edge hold time

cycle time (single-channel write)

Rev. 0 | Page 11 of 40

AD5380

t

t

0

1

REG0, REG1, A5..A0

WR

DB13..DB0

BUSY

LDAC

V

OUT

LDAC

V

OUT

CLR

V

OUT

CS

1

1

2

2

t

4

t

5

t

2

t

9

t

3

t

6

t

t

t

8

t

t

7

10

t

11

t

12

19

t

13

t

20

15

t

18

t

14

t

16

t

13

t

18

t

17

1

LDAC ACTIVE DURING BUSY

2

LDAC ACTIVE AFTER BUSY

03731-0-008

Figure 7. Parallel Interface Timing Diagram

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