ANALOG DEVICES AD5306, AD5316, AD5326 Service Manual

0 (0)

2.5 V to 5.5 V, 400 μA, 2-Wire Interface,

Quad Voltage Output, 8-/10-/12-Bit DACs

FEATURES

AD5306: 4 buffered, 8-bit DACs in 16-lead TSSOP A version: ±1 LSB INL; B version: ±0.625 LSB INL AD5316: 4 buffered, 10-bit DACs in 16-lead TSSOP A version: ±4 LSB INL; B version: ±2.5 LSB INL AD5326: 4 buffered, 12-bit DACs in 16-lead TSSOP A version: ±16 LSB INL; B version: ±10 LSB INL Low power operation: 400 μA @ 3 V, 500 μA @ 5 V 2-wire (I

2.5 V to 5.5 V power supply Guaranteed monotonic by design over all codes Power-down to 90 nA @ 3 V, 300 nA @ 5 V (

Double-buffered input logic Buffered/unbuffered reference input options Output range: 0 V to V Power-on reset to 0 V Simultaneous update of outputs (

Software clear facility Data readback facility On-chip rail-to-rail output buffer amplifiers Temperature range −40°C to +105°C

APPLICATIONS

Portable battery-powered instruments Digital gain and offset adjustment Programmable voltage and current sources Programmable attenuators Industrial process control

Protected by U.S. Patent Numbers 5,969,657 and 5,684,481.

Rev. F

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.

C®-compatible) serial interface

or 0 V to 2 V

REF

LDAC

REF

pin)

pin or bit)

AD5306/AD5316/AD5326

FUNCTIONAL BLOCK DIAGRAM

DAC

REF

STRING

DAC A

STRING

DAC B

STRING

DAC C

STRING

DAC D

REF

BUFFER

POWER-DOWN

LDAC

AD5306/AD5316/AD5326

LDAC

SCL SDA

A1 A0

POWER-ON

RESET

LDAC

INTERFACE

LOGIC

INPUT

Figure 1.

GENERAL DESCRIPTION

The AD5306/AD5316/AD53261 are quad 8-/10-/12-bit buffered voltage output DACs in 16-lead TSSOP packages that operate from a single 2.5 V to 5.5 V supply, consuming 500 μA at 3 V. Their on-chip output amplifiers allow rail-to-rail output swing with a slew rate of 0.7 V/μs. A 2-wire serial interface, which operates at clock rates up to 400 kHz, is used. This interface is SMBus-compatible at V placed on the same bus.

Each DAC has a separate reference input that can be configured as buffered or unbuffered. The outputs of all DACs can be updated simultaneously using the asynchronous

The parts incorporate a power-on reset circuit that ensures the DAC outputs power up to 0 V and remain there until a valid write to the device takes place. The software clear function clears all DACs to 0 V. The parts contain a power-down feature that reduces the current consumption of the device to 300 nA @ 5 V (90 nA @ 3 V).

All three parts have the same pinout, which allows users to select the amount of resolution appropriate for their application without redesigning their circuit board.

< 3.6 V. Multiple devices can be

LOGIC

GNDPD

input.

OUT

02066-001

AD5306/AD5316/AD5326

TABLE OF CONTENTS

Specifications..................................................................................... 3

AC Characteristics........................................................................ 5

Timing Characteristics ................................................................ 6

Absolute Maximum Ratings............................................................ 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Te r mi n ol o g y ...................................................................................... 9

Typical Performance Characteristics ........................................... 11

Functional Description .................................................................. 15

Digital-to-Analog Section ......................................................... 15

Resistor String............................................................................. 15

DAC Reference Inputs ............................................................... 15

Output Amplifier........................................................................ 15

Power-On Reset .......................................................................... 16

Serial Interface............................................................................ 16

Read/Write Sequence................................................................. 16

Pointer Byte Bits ......................................................................... 16

Input Shift Register..................................................................... 16

Default Readback Conditions................................................... 17

Multiple DAC Write Sequence ................................................. 17

Multiple DAC Readback Sequence .......................................... 17

Write Operation.......................................................................... 18

Read Operation........................................................................... 18

Double-Buffered Interface........................................................ 19

Load DAC Input

Power-Down Mode .................................................................... 19

Applications..................................................................................... 20

Typical Application C i r c uit ....................................................... 20

Driving V

Bipolar Operation Using the AD5306/AD5316/AD5326..... 20

Multiple Devices on One Bus ................................................... 20

AD5306/AD5316/AD5326 as a Digitally Programmable

Window Detector....................................................................... 21

Coarse and Fine Adjustment Using the

AD5306/AD5316/AD5326 ....................................................... 21

Power Supply Decoupling ............................................................. 22

Outline Dimensions ....................................................................... 24

Ordering Guide .......................................................................... 24

LDAC

............................................................. 19

from the Reference Voltage ................................ 20

REVISION HISTORY

8/05—Rev. E to Rev. F

Replaced Figure 22 .........................................................................13 Changes to Bipolar Operation

Using the AD5306/AD5316/AD5326 Section........................ 20

Changes to Ordering Guide.......................................................... 24

5/05—Rev. D to Rev. E

Changes to Table 1............................................................................ 3

11/04—Rev. C to Rev. D

Change to Figure 31 ....................................................................... 16

Changes to Pointer Byte Section................................................... 16

Change to Figure 32 ....................................................................... 17

Rev. F | Page 2 of 24

8/03—Rev. B to Rev. C

Added A Version ................................................................Universal

Changes to FEATURES ....................................................................1

Changes to SPECIFICATIONS .......................................................2

Changes to ABSOLUTE MAXIMUM RATINGS .........................5

Edits to ORDERING GUIDE ..........................................................5

Changes to TPC 21......................................................................... 11

Added OCTALS section to Table I............................................... 18

Updated OUTLINE DIMENSIONS ............................................ 19

4/01—Rev. A to Rev. B

Edit to Figure 6 ............................................................................... 13

Edits to RIGHT/LEFT section of Pointer Byte Bits section...... 13

Edits to Input Shift Register section ............................................ 13

Edits to Figure 7.............................................................................. 13

Edits to Figure 8.............................................................................. 14

Edits to Figure 9.............................................................................. 14

Edit to Figure 12 ............................................................................. 16

2/01—Rev. 0 to Rev. A 6/00—Revision 0: Initial Version

AD5306/AD5316/AD5326

SPECIFICATIONS

VDD = 2.5 V to 5.5 V; V

Table 1.

A Version

Parameter

DC PERFORMANCE

DAC REFERENCE INPUTS

OUTPUT CHARACTERISTICS

3, 4

AD5306

Resolution 8 8 Bits Relative Accuracy ±0.15 ±1 ±0.15 ±0.625 LSB Differential Nonlinearity ±0.02 ±0.25 ±0.02 ±0.25 LSB Guaranteed monotonic by

AD5316

Resolution 10 10 Bits Relative Accuracy ±0.5 ±4 ±0.5 ±2.5 LSB Differential Nonlinearity ±0.05 ±0.5 ±0.05 ±0.5 LSB Guaranteed monotonic by

AD5326

Resolution 12 12 Bits Relative Accuracy ±2 ±16 ±2 ±10 LSB Differential Nonlinearity ±0.2 ±1 ±0.2 ±1 LSB Guaranteed monotonic by

Offset Error ±5 ±60 ±5 ±60 mV VDD = 4.5 V, gain = 2;

Gain Error ±0.3 ±1.25 ±0.3 ±1.25 % of FSR VDD = 4.5 V, gain = 2;

Lower Deadband

Upper Deadband

Offset Error Drift Gain Error Drift

DC Power Supply

Rejection Ratio

DC Crosstalk

REF

Input Range 1 V

0.25 V V

Input Impedance >10 >10 MΩ Buffered reference mode

REF

148 180 148 180 kΩ Unbuffered reference mode;

74 90 74 90 kΩ Unbuffered reference mode;

Reference Feedthrough −90 −90 dB Frequency = 10 kHz. Channel-to-Channel Isolation −75 −75 dB Frequency = 10 kHz.

Minimum Output Voltage

Maximum Output Voltage DC Output Impedance 0.5 0.5 Ω

= 2 V; RL = 2 kΩ to GND; CL = 200 pF to GND; all specifications T

REF

Min Typ Max Min Typ Max Unit Conditions/Comments

10 60 10 60 mV See Figure 4; lower

10 60 10 60 mV See Figure 5; upper

−12 –12 ppm of FSR/°C –5 –5 ppm of FSR/°C

–60 –60 dB ΔVDD = ±10%.

200 200 μV RL = 2 kΩ to GND or V

0.001 0.001 V This is a measure of the

− 0.001 VDD − 0.001 V

1 V

0.25 V

B Version

to T

MIN

, unless otherwise noted.

MAX

design over all codes.

Figure 4 and Figure 5.

see

Figure 4 and Figure 5.

see

deadband exists only if offset error is negative.

deadband exists only if V

= VDD and offset plus

REF

gain error is positive.

DD.

V Buffered reference mode. V Unbuffered reference mode.

and power-down mode.

0 V to V

0 V to 2 V

output range.

REF

output range.

REF

minimum and maximum drive capability of the output amplifier.

Rev. F | Page 3 of 24

AD5306/AD5316/AD5326

A Version

Parameter

Min Typ Max Min Typ Max Unit Conditions/Comments

B Version

Short-Circuit Current 25 25 mA VDD = 5 V. 16 16 mA VDD = 3 V.

Power-Up Time 2.5 2.5 μs Coming out of power-

down mode; V

= 5 V.

5 5 μs Coming out of power-

= 3 V.

LOGIC INPUTS

(Excluding SCL, SDA)

down mode; V

Input Current ±1 ±1 μA

VIL, Input Low Voltage 0.8 0.8 V VDD = 5 V ± 10%.

0.6 0.6 V VDD = 3 V ± 10%.

0.5 0.5 V VDD = 2.5 V.

VIH, Input High Voltage 1.7 1.7 V VDD = 2.5 V to 5.5 V;

TTL and 1.8 V CMOS compatible.

Pin Capacitance 3 3 pF

LOGIC INPUTS (SCL, SDA)6

VIH, Input High Voltage 0.7 V

VIL, Input Low Voltage −0.3 +0.3 V

+ 0.3 0.7 V

+ 0.3 V SMBus compatible at

< 3.6 V.

−0.3 +0.3 VDDV SMBus compatible at < 3.6 V.

IIN, Input Leakage Current ±1 ±1 μA V

, Input Hysteresis 0.05 VDD 0.05 VDD V See Figure 20.

HYST

CIN, Input Capacitance 8 8 pF Glitch Rejection 50 50 ns Input filtering suppresses

noise spikes of less than 50 ns.

LOGIC OUTPUT (SDA)6

VOL, Output Low Voltage 0.4 0.4 V I

0.6 0.6 V I

= 3 mA.

SINK

= 6 mA.

SINK

Three-State Leakage Current ±1 ±1 μA Three-State Output

8 8 pF

Capacitance

POWER REQUIREMENTS

IDD (Normal Mode)

2.5 5.5 2.5 5.5 V V

= VDD and VIL = GND;

interface inactive.

VDD = 4.5 V to 5.5 V 500 900 500 900 μA All DACs in unbuffered

mode.

Buffered mode, extra

current is typically x mA per DAC, where x = 5 μA + V

REF/RDAC.

VDD = 2.5 V to 3.6 V 400 750 400 750 μA

IDD (Power-Down Mode) VIH = VDD and VIL = GND;

interface inactive.

VDD = 4.5 V to 5.5 V 0.3 1 0.3 1 μA IDD = 3 μA (max) during

readback on SDA.

VDD = 2.5 V to 3.6 V 0.09 1 0.09 1 μA IDD = 1.5 μA (max) during

readback on SDA.

Temperature range (A, B versions): −40°C to +105°C; typical at +25°C.

See the Terminology section.

DC specifications tested with the outputs unloaded.

Linearity is tested using a reduced code range: AD5306 (Code 8 to 255); AD5316 (Code 28 to 1023); AD5326 (Code 115 to 4095).

This corresponds to x codes. x = deadband voltage/LSB size.

Guaranteed by design and characterization; not production tested.

For the amplifier output to reach its minimum voltage, the offset error must be negative; for the amplifier output to reach its maximum voltage, V

the offset plus gain error must be positive.

Interface inactive; all DACs active. DAC outputs unloaded.

= VDD,

REF

Rev. F | Page 4 of 24

AD5306/AD5316/AD5326

AC CHARACTERISTICS

VDD = 2.5 V to 5.5 V; RL = 2 kΩ to GND; CL = 200 pF to GND; all specifications T

Table 2.

A, B Versions Parameter

Min Typ Max Unit Conditions/Comments

1, 2

Output Voltage Settling Time V

AD5306 6 8 μs 1/4 scale to 3/4 scale change (0x40 to 0xC0) AD5316 7 9 μs 1/4 scale to 3/4 scale change (0x100 to 0x300)

AD5326 8 10 μs 1/4 scale to 3/4 scale change (0x400 to 0xC00) Slew Rate 0.7 V/μs Major-Code Change Glitch Energy 12 nV-s 1 LSB change around major carry Digital Feedthrough 0.5 nV-s Digital Crosstalk 0.5 nV-s Analog Crosstalk 1 nV-s DAC-to-DAC Crosstalk 3 nV-s Multiplying Bandwidth 200 kHz V Total Harmonic Distortion −70 dB V

Guaranteed by design and characterization; not production tested.

Temperature range (A, B versions): −40°C to +105°C; typical at +25°C.

See the Terminology section.

MIN

to T

, unless otherwise noted.

MAX

= VDD = 5 V

REF

= 2 V ± 0.1 V p-p, unbuffered mode

REF

= 2.5 V ± 0.1 V p-p, frequency = 10 kHz

REF

Rev. F | Page 5 of 24

AD5306/AD5316/AD5326

TIMING CHARACTERISTICS

VDD = 2.5 V to 5.5 V; all specifications T

Table 3.

Parameter

0 μs min t

0 ns min tR, rise time of SCL and SDA when receiving (CMOS compatible) t

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 + 0.1C t

See Figure 2.

Guaranteed by design and characterization; not production tested.

A master device must provide a hold time of at least 300 ns for the SDA signal (referred to the VIH min of the SCL signal) to bridge the undefined region of SCL’s

falling edge.

CB is the total capacitance of one bus line in pF. tR and tF measured between 0.3 VDD and 0.7 VDD.

Limit at T

2.5 μs min SCL cycle time

0.6 μs min t

1.3 μs min t

0.6 μs min t 100 ns min t

0.9 μs max t

0.6 μs min t

1.3 μs min t 300 ns max tR, rise time of SCL and SDA when receiving

250 ns max tF, fall time of SDA when transmitting

20 ns min 400 ns min 400 pF max Capacitive load for each bus line

MIN

A, B Versions

, T

MIN

MAX

to T

, unless otherwise noted.

MAX

Unit Conditions/Comments

, 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

, setup time for repeated start

SU,STA

, stop condition setup time

SU,STO

, bus free time between a stop and a start condition

BUF

ns min tF, fall time of SCL and SDA when transmitting

LDAC pulse width SCL rising edge to

LDAC rising edge

START CONDITION

SCL

LDAC

NOTES

ASYNCHRONOUS LDAC UPDATE MODE.

SYNCHRONOUS LDAC UPDATE MODE.

Figure 2. 2-Wire Serial Interface Timing Diagram

REPEATED START CONDITION

STOP CONDITION

02066-002

Rev. F | Page 6 of 24

AD5306/AD5316/AD5326

ABSOLUTE MAXIMUM RATINGS

TA = 25°C, unless otherwise noted.

Table 4.

Parameter

VDD to GND −0.3 V to +7 V SCL, SDA to GND −0.3 V to VDD + 0.3 V A0, A1, LDAC, PD to GND Reference Input Voltage to GND −0.3 V to VDD + 0.3 V V

OUT

Operating Temperature Range

Industrial (A, B Versions) −40°C to +105°C

Storage Temperature Range −65°C to +150°C

Junction Temperature (TJ max) 150°C 16-Lead TSSOP

Power Dissipation (TJ max − TA)/θ θJA Thermal Impedance 150.4°C/W Reflow Soldering

Peak Temperature 220°C

Time at Peak Temperature 10 sec to 40 sec

Transient currents of up to 100 mA do not cause SCR latch-up.

A to V

D to GND −0.3 V to VDD + 0.3 V

OUT

Value

−0.3 V to V

+ 0.3 V

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

Rev. F | Page 7 of 24

AD5306/AD5316/AD5326

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

LDAC

OUT

REF

AD5306/

AD5316/

AD5326

TOP VIEW

(Not to Scale)

SCL

SDA

GND

OUT

REF

02066-003

Figure 3. Pin Configuration

Table 5. Pin Function Descriptions

Pin No. Mnemonic Description

LDAC

Active Low Control Input. Transfers the contents of the input registers to their respective DAC registers. Pulsing this pin low allows any or all DAC registers to be updated if the input registers have new data. This allows simultaneous update of all DAC outputs. Alternatively, this pin can be tied permanently low.

2 V

Power Supply Input. These parts can be operated from 2.5 V to 5.5 V and the supply should be decoupled

with a10 μF capacitor in parallel with a 0.1 μF capacitor to GND. 3 V 4 V 5 V 6 V

A Buffered Analog Output Voltage from DAC A. The output amplifier has rail-to-rail operation.

OUT

B Buffered Analog Output Voltage from DAC B. The output amplifier has rail-to-rail operation.

OUT

C Buffered Analog Output Voltage from DAC C. The output amplifier has rail-to-rail operation.

OUT

REF

Reference Input Pin for DAC A. This pin can be configured as a buffered or an unbuffered input depending on

the state of the BUF bit in the input word to DAC A. It has an input range from 0.25 V to V

7 V

REF

mode and from 1 V to V

Reference Input Pin for DAC B. This pin can be configured as a buffered or an unbuffered input depending on

in buffered mode.

the state of the BUF bit in the input word to DAC B. It has an input range from 0.25 V to V

8 V

REF

mode and from 1 V to V

Reference Input Pin for DAC C. This pin can be configured as a buffered or an unbuffered input depending on

in buffered mode.

the state of the BUF bit in the input word to DAC C. It has an input range from 0.25 V to V

9 V

REF

mode and from 1 V to V

Reference Input Pin for DAC D. This pin can be configured as a buffered or an unbuffered input depending on

in buffered mode.

the state of the BUF bit in the input word to DAC D. It has an input range from 0.25 V to V

in buffered mode.

mode and from 1 V to V

PD Active Low Control Input. Acts as a hardware power-down option. All DACs go into power-down mode when

this pin is tied low. The DAC outputs go into a high impedance state. The current consumption of the part

drops to 300 nA @ 5 V (90 nA @ 3 V). 11 V

D Buffered Analog Output Voltage from DAC D. The output amplifier has rail-to-rail operation.

OUT

12 GND Ground Reference Point for All Circuitry on the Part. 13 SDA

Serial Data Line. This is used in conjunction with the SCL line to clock data into the 16-bit input shift register.

It is a bidirectional open-drain data line that should be pulled to the supply with an external pull-up resistor. 14 SCL

Serial Clock Line. This is used in conjunction with the SDA line to clock data into the 16-bit input shift register.

Clock rates of up to 400 kbps can be accommodated in the I 15 A0 Address Input. Sets the LSB of the 7-bit slave address. 16 A1 Address Input. Sets the second LSB of the 7-bit slave address.

C-compatible interface.

in unbuffered

Rev. F | Page 8 of 24

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