ANALOG DEVICES AD5547 Service Manual

Dual-Current Output, Parallel Input, 16-/14-Bit

V

Multiplying DACs with 4-Quadrant Resistors

Data Sheet

FEATURES

Dual channel 16-bit resolution: AD5547 14-bit resolution: AD5557 2- or 4-quadrant, 6.8 MHz BW multiplying DAC ±1 LSB DNL ±1 LSB INL Operating supply voltage: 2.7 V to 5.5 V Low noise: 12 nV/√Hz Low power: I

0.5 μs settling time Built-in R Built-in 4-quadrant resistors allow 0 V to –10 V, 0 V to +10 V,

or ±10 V outputs 2 mA full-scale current ± 20%, with V Extended automotive operating temperature range

−40°C to +125°C Selectable zero-scale/midscale power-on presets Compact 38-lead TSSOP package

APPLICATIONS

Automatic test equipment Instrumentation Digitally controlled calibration Digital waveform generation

= 10 μA max

DD

facilitates current-to-voltage conversion

FB

= 10 V

REF

U1

–VREF

AD5547/AD5557

FUNCTIONAL BLOCK DIAGRAM

R

COMA

1A

V

D0 TO D15

(AD5547)

D0 TO D13

(AD5557)

WR

A0, A1

DD

D0..D15

OR

D0..D13

DAC A DAC B

ADDR DECODE

INPUT

REGIST ER

INPUT

REGIST ER

POWER

ON

RESET

MSB LDACDGND

RS

REGISTER

RS

REGISTER

RS

AD5547/AD5557

Figure 1.

GENERAL DESCRIPTION

The AD5547/AD5557 are dual precision, 16-/14-bit, multiplying, low power, current-output, parallel input, digital-to-analog converters (DACs). They are designed to operate from single +5 V supply with ±10 V multiplying references for 4-quadrant outputs with 6.8 MHz bandwidth.

The built-in, 4-quadrant resistors facilitate resistance matching and temperature tracking, which minimize the number of components needed for multiquadrant applications. In addition, the feedback resistor (R an external buffer.

The AD5547/AD5557 are available in a compact, 38-lead TSSOP package and operate at the extended automotive temperature range of −40°C to +125°C.

) simplifies the I-to-V conversion with

FB

REFA

DAC A

DAC B

R

OFSA

R

FBA

V

REFB

I

OUTA

AGNDA

AGNDB

I

OUTB

R

FBB

R

OFSB

DAC A

RS

DAC B

RS

R

COMB

1B

04452-013

C1

R

REFA

OFSARFBA

RFBROFS

16-/14-BIT

DAC A

(ONE CHANNEL S HOWN ONLY)

IOUTA

AGNDA

C2

U2

VOUTA

–VREF TO +VREF

04452-002

16/14 DATA

WR

LDAC

RS

MSB

A0, A1

R

1A

COMA

R1 R2

AD5547/AD5557

POWER-ON

RESET

WR RSLDAC

V

MSB A0, A1

2

Figure 2. 16-/14-Bit 4-Quadrant Multiplying DAC with Minimum of External Components (Only One Channel Is Shown)

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her 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.

AD5547/AD5557 Data Sheet

REVISION HISTORY

11/11—Rev. B to Rev. C

Added Figure 14; Renumbered Sequentially .............................. 11

4/10—Rev. A to Rev. B

Changes to Features Section and General Description Section . 1

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

Deleted Figure 17 and Figure 18; Renumbered Sequentially ... 10

Changes to Figure 15 and Figure 16............................................. 11

Changes to Figure 20...................................................................... 14

Added Reference Selection Section, Amplifier Selection Section,

Table 10, and Table 11; Renumbered Sequentially..................... 18

Added Table 12 ...............................................................................19

DAC Section................................................................................ 12

Digital Section ............................................................................ 13

PCB Layout, Power Supply Bypassing, and Ground

Connections ................................................................................ 13

Applications Information.............................................................. 14

Unipolar Mode ........................................................................... 14

Bipolar Mode .............................................................................. 16

Reference Selection .................................................................... 18

Amplifier Selection .................................................................... 18

Outline Dimensions....................................................................... 20

Ordering Guide .......................................................................... 20

9/09—Rev. 0 to Rev. A

Changes to Features Section ............................................................1

Changes to Static Performance, Relative Accuracy,

Grade: AD5547C Parameter, Table 1..............................................3

Changes to Ordering Guide.......................................................... 19

1/04—Revision 0: Initial Version



Rev. C | Page 2 of 20

Data Sheet AD5547/AD5557

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

VDD = 2.7 V to 5.5 V, I

Table 1.

Parameter Symbol Test Conditions/Comments Min Typ Max Unit

STATIC PERFORMANCE1

Resolution N AD5547, 1 LSB = V AD5557, 1 LSB = V Relative Accuracy INL Grade: AD5557C ±1 LSB Grade: AD5547B ±2 LSB Grade: AD5547C ±1 LSB Differential Nonlinearity DNL Monotonic ±1 LSB Output Leakage Current I Data = zero scale, TA = TA maximum 20 nA Full-Scale Gain Error G Bipolar Mode Gain Error GE Data = full scale ±1 ±4 mV Bipolar Mode Zero-Scale Error G Full-Scale Temperature Coefficient2 TCVFS 1 ppm/°C

REFERENCE INPUT

V

Range V

REF

REF Input Resistance REF 4 5 6 kΩ R1 and R2 Resistance R1 and R2 4 5 6 kΩ R1-to-R2 Mismatch Δ(R1 to R2) ±0.5 ±1.5 Ω Feedback and Offset Resistance RFB, R Input Capacitance2 C

ANALOG OUTPUT

Output Current I Output Capacitance2 C

LOGIC INPUT AND OUTPUT

Logic Input Low Voltage VIL V V Logic Input High Voltage VIH V V Input Leakage Current IIL 10 μA Input Capacitance2 C

INTERFACE TIMING

Data to WR Setup Time V Data to WR Hold Time V WR Pulse Width

V LDAC Pulse Width t V RS Pulse Width V WR to LDAC Delay Time

V

= virtual GND, GND = 0 V, V

OUT

Data = zero scale, TA = 25°C 10 nA

OUT

Data = full scale ±1 ±4 mV

FSE

Data = full scale ±1 ±3 mV

ZSE

−18 +18 V

REF

8 10 12 kΩ

OFS

5 pF

REF

Data = full scale 2 mA

OUT

Code dependent 200 pF

OUT

10 pF

2, 3

See Figure 3

IL

t

V

DS

t

V

DH

t

V

WR

V

LDAC

t

V

RS

t

V

LWD

= −10 V to +10 V, TA = −40°C to +125°C, unless otherwise noted.

REF

/216 = 153 μV at V

REF

/214 = 610 μV at V

REF

= 5 V 0.8 V

DD

= 3 V 0.4 V

DD

= 5 V 2.4 V

DD

= 3 V 2.1 V

DD

= 5 V 20 ns

DD

= 3 V 35 ns

DD

= 5 V 0 ns

DD

= 3 V 0 ns

DD

= 5 V 20 ns

DD

= 3 V 35 ns

DD

= 5 V 20 ns

DD

= 3 V 35 ns

DD

= 5 V 20 ns

DD

= 3 V 35 ns

DD

= 5 V 0 ns

DD

= 3 V 0 ns

DD

= 10 V 16 Bits

REF

= 10 V 14 Bits

REF

Rev. C | Page 3 of 20

AD5547/AD5557 Data Sheet

Parameter Symbol Test Conditions/Comments Min Typ Max Unit

SUPPLY CHARACTERISTICS

Power Supply Range V Positive Supply Current IDD Logic inputs = 0 V 10 μA Power Dissipation P Power Supply Sensitivity

P

AC CHARACTERISTICS4

Output Voltage Settling Time tS

Reference Multiplying BW BW V DAC Glitch Impulse Q V Multiplying Feedthrough Error V Digital Feedthrough QD Total Harmonic Distortion THD V Output Noise Density eN f = 1 kHz, BW = 1 Hz 12 nV/√Hz Analog Crosstalk CAT

1

All static performance tests (except I

tied to the amplifier output. The +IN pin of the OP97 is grounded, and the I measured at 25°C.

2

Guaranteed by design; not subject to production testing.

3

All input control signals are specified with tR = tF = 2.5 ns (10% to 90% of 3 V) and are timed from a voltage level of 1.5 V.

4

All ac characteristic tests are performed in a closed-loop system using an AD8038 I-to-V converter amplifier except for THD where the AD8065 was used.

) are performed in a closed-loop system using an external precision OP97 I-to-V converter amplifier. The device RFB terminal is

OUT

Timing Diagram

WR

2.7 5.5 V

DD RANGE

Logic inputs = 0 V 0.055 mW

DISS

∆VDD = ±5% 0.003 %/%

SS

To ±0.1% of full scale, data cycles from zero scale

0.5 μs

to full scale to zero scale

= 100 mV rms, data = full scale 6.8 MHz

REF

= 0 V, midscale – 1 to midscale −3.5 nV-s

REF

OUT/VREF

V

= 100 mV rms, f = 10 kHz −78 dB

REF

= 1, LDAC toggles at 1 MHz

WR

= 5 V p-p, data = full scale, f = 1 kHz −104 dB

REF

Signal input at Channel A and measures the

7 nV-s

−95 dB

output at Channel B, f = 1 kHz

of the DAC is tied to the OP97’s −IN pin. Typical values represent average readings

OUT

t

WR

DATA

t

DH

t

LWD

t

LDAC

t

RS

04452-018

LDAC

RS

t

DS

Figure 3. AD5547/AD5557 Timing Diagram

Rev. C | Page 4 of 20

Data Sheet AD5547/AD5557

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

VDD to GND −0.3 V to +8 V RFB, R

OFS

, R1, R

, and VREF to GND −18 V to +18 V

COM

Logic Inputs to GND −0.3 V to +8 V V(I

) to GND −0.3 V to VDD + 0.3 V

OUT

Input Current to Any Pin except Supplies ±50 mA Thermal Resistance (θJA)1 Maximum Junction Temperature (TJ

) 150°C

MAX

Operating Temperature Range −40°C to +125°C Storage Temperature Range −65°C to +150°C Lead Temperature

Vapor Phase, 60 sec 215°C Infrared, 15 sec 220°C

1

Package power dissipation = (T

J MAX

− TA)/θJA.

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

Rev. C | Page 5 of 20

AD5547/AD5557 Data Sheet

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

AGNDA

Table 3. AD5547 Pin Function Descriptions

Pin No. Mnemonic Function

1, 2, 24 to

D0 to D15 Digital Input Data Bits D0 to D15. Signal level must be ≤ V 28, 30 to 38

3 R

4 R 5 R1A

OFSA

Internal Matching Feedback Resistor A. Connects to the external op amp for I-to-V conversion.

FBA

Bipolar Offset Resistor A. Accepts up to ±18 V. In 2-quadrant mode, R ties to R

and the external reference.

1A

4-Quandrant Resistor. In 2-quadrant mode, R not connect when operating in unipolar mode.

6 R

COMA

Center Tap Point of the Two 4-Quadrant Resistors, R node of the reference amplifier. In 2-quadrant mode, R operating in unipolar mode.

7 V

REFA

DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, V reference input with constant input resistance vs. code. In 4-quadrant mode, V reference amplifier.

8 I

DAC A Current Output. Connects to the inverting terminal of external precision I-to-V op amp for voltage output.

OUTA

9 AGNDA DAC A Analog Ground. 10 DGND Digital Ground. 11 AGNDB DAC B Analog Ground. 12 I 13 V

DAC B Current Output. Connects to inverting terminal of external precision I-to-V op amp for voltage output.

OUTB

REFB

DAC B Reference Input Pin. Establishes DAC full-scale voltage. Constant input resistance vs. code. If configured with an external op amp for 4-quadrant multiplying, V

14 R

COMB

Center Tap Point of the Two 4-Quadrant Resistors, R node of the reference amplifier. In 2-quadrant mode, R unipolar mode.

15 R1B

4-Quandrant Resistor. In 2-quadrant mode, R connect if operating in unipolar mode.

16 R 17 R

18

Internal Matching Feedback Resistor B. Connects to external op amp for I-to-V conversion.

FBB

OFSB

Write Control Digital Input In, Active Low. WR transfers shift register data to the DAC register on the rising edge.

WR

Bipolar Offset Resistor B. Accepts up to ±18 V. In 2-quadrant mode, R ties to R

and an external reference.

1B

Signal level must be ≤VDD + 0.3 V.

1

D1

D0

2

R

3

OFSA

R

4

FBA

R

5

1A

R

6

COMA

V

7

REFA

I

8

OUTA

DGND

I

OUTB

V

REFB

R

COMB

R

OFSB

R

FBB

WR

10

11

12

13

14

15

1B

16

17

18

A0

19

9

AD5547

TOP VIEW

(Not to Scale)

Figure 4. AD5547 Pin Configuration

shorts to the V

1A

shorts to the V

1B

D2

38

37

D3

D4

36

D5

35

34

D6

D7

33

D8

32

31

D9

D10

30

VDD

29

28

D11

D12

27

D13

26

25

D14

D15

24

23

RS

22

MSB

LDAC

21

20

A1

04452-003

+ 0.3 V.

DD

ties to R

OFSA

pin. In 4-quadrant mode, R1A ties to R

REFA

and R2A. In 4-quadrant mode, R

1A

shorts to the associated V

COMA

REFA

becomes –V

REFB

and R2B. In 4-quadrant mode, R

1B

shorts to the V

COMB

REFB

.

REF

pin. Do not connect if operating in

REFB

pin. In 4-quadrant mode, R1B ties to R

ties to R

OFSB

. In 4-quadrant mode, R

FBA

OFSA

ties to the inverting

COMA

pin. Do not connect if

REFA

is driven by the external

ties to the inverting

COMB

OFSB

. In 4-quadrant mode, R

FBB

OFSA

. Do

is the

. Do not

OFSB

Rev. C | Page 6 of 20

ANALOG DEVICES AD5547 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

APPLICATIONS

FUNCTIONAL BLOCK DIAGRAM

GENERAL DESCRIPTION

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

Timing Diagram

ABSOLUTE MAXIMUM RATINGS

ESD CAUTION

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS