Analog Devices AD5547 57 Datasheet

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

V

(

(

Multiplying DACs with 4-Quadrant Resistors

FEATURES

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

Low power: I

DD

0.5 µs settling time
Built-in R

facilitates current-to-voltage conversion

FB

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 TSSOP-38 package

APPLICATIONS

Automatic test equipment
Instrumentation
Digitally controlled calibration
Digital waveform generation

GENERAL DESCRIPTION

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

Hz

= 10 µA max

VREF

= 10 V

REF

U1

–VREF

AD5547/AD5557

FUNCTIONAL BLOCK DIAGRAM

R

R

COMA

1A

V

D0–D15

AD5547)

D0–D13

AD5557)

WR

A0, A1

DD

D0..D15

OR

D0..D13

DAC A
DAC B

ADDR
DECODE

INPUT

REGISTER

INPUT

REGISTER

POWER

ON

RESET

MSB LDACDGND

RS

REGISTER

RS

REGISTER

RS

AD5547/AD5557

Figure 1.

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

) simplifies the I-V conversion with an

FB

external buffer.

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

REFA

DAC A

DAC B

R

OFSA

R

FBA

V

REFB

I

OUTA

AGNDA

AGNDB

I

OUTB

R

FBB

R

OFSB

04452-0-013

DAC A

RS

DAC B

RS

R

R

COMB

1B

C1

R

COMA

RESET

V

MSB A0, A1

2

R

REFA

OFSARFBA

16-/14-BIT

DAC A

(ONE CHANNEL SHOWN ONLY)

IOUTA

C2

U2

VOUTA

–VREF TO +VREF

04452-0-002

RFBROFS

AGNDA

16/14 DATA

WR

LDAC

RS

MSB

A0, A1

R

1A

R1 R2

AD5547/AD5557

POWER-ON

WR RSLDAC

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

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.

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

www.analog.com

AD5547/AD5557

TABLE OF CONTENTS

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

Absolute Maximum Ratings............................................................ 5

ESD Caution.................................................................................. 5

Pin Configurations and Function Descriptions ........................... 6

Typical Performance Characteristics ............................................. 9

Circuit Operation ...........................................................................12

D/A Converter Section .............................................................. 12

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

REVISION HISTORY

Revision 0: Initial Version

PCB Layout, Power Supply Bypassing, and Ground

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

Applications..................................................................................... 14

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

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

Outline Dimensions....................................................................... 19

Ordering Guide .......................................................................... 19

Rev. 0 | Page 2 of 20

AD5547/AD5557

SPECIFICATIONS

VDD = 2.7 V to 5.5 V, I

Table 1. Electrical Characteristics

Parameter Symbol Conditions 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

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 Tempco2 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 ∆(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
SUPPLY CHARACTERISTICS

Power Supply Range V

Positive Supply Current IDD Logic inputs = 0 V 10 µA

Power Dissipation P

Power Supply Sensitivity PSS ∆VDD = ±5% 0.003 %/%

= 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

IL

t

V

DS

t

V

DH

t

WR

V

LDAC

t

V

RS

t

V

LWD

2.7 5.5 V

DD RANGE

Logic inputs = 0 V 0.055 mW

DISS

= –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

= 10 V 16 Bits

REF

= 10 V 14 Bits

REF

VDD = 5 V 20 ns

= 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

Rev. 0 | Page 3 of 20

AD5547/AD5557

Parameter Symbol Conditions Min Typ Max Unit

AC CHARACTERISTICS4

Output Voltage Settling Time tS

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

to full scale to zero scale
Reference Multiplying BW BW V
DAC Glitch Impulse Q V
Multiplying Feedthrough Error V

OUT/VREF

V

Digital Feedthrough QD
Total Harmonic Distortion THD V

= 5 V p-p, data = full scale 4 MHz

REF

= 0 V, midscale to midscale – 1 7 nV-s

REF

= 100 mV rms, f = 10 kHz –65 dB

REF

WR = 1, LDAC toggles at 1 MHz

= 5 V p-p, data = full scale, f = 1 kHz –85 dB

REF

Output Noise Density eN f = 1 kHz, BW = 1 Hz 12
Analog Crosstalk CAT

Signal input at Channel A and measure the output

at Channel B, f = 1 kHz

1

All static performance tests (except I

to the amplifier output. The OP97’s +IN pin is grounded, and the DAC’s I

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 AD841 I-V converter amplifier.

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

OUT

is tied to the OP97’s –IN pin. Typical values represent average readings measured at 25°C.

OUT

t

WR

WR

0.5 µs

7 nV-s

Hz

nV/√

–95 dB

DATA

t

DH

t

LWD

t

LDAC

t

RS

03810-0-005

LDAC

RS

t

DS

Figure 3. AD5547/AD5557 Timing Diagram

Rev. 0 | Page 4 of 20

AD5547/AD5557

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

VDD to GND –0.3 V, +8 V
RFB, R

OFS

, R1, R

, and VREF to GND –18 V, 18 V

COM

Logic Inputs to GND –0.3 V, +8 V
V(I

) to GND –0.3 V, 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 s 215°C
Infrared, 15 s 220°C

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 listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

1

Package power dissipation = (T

J MAX

– TA)/θJA.

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. 0 | Page 5 of 20

AD5547/AD5557

A

A

A

A

A

A

A

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

R

OFSA

R

R

COMA

V

REFA

I

OUTA

GND
DGND
GND

I

OUTB

V

REFB

R

COMB

R

R

OFSB

FBA

R

R

FBB

WR

1

D1

2

D0

3
4
5

1A

6
7
8

AD5547

9
10
11
12
13
14
15

1B

16
17
18
19

A0

TOP VIEW

(Not to Scale)

38

D2
D3

37

D4

36

D5

35
34

D6

33

D7
D8

32

D9

31

D10

30
29

VDD

28

D11
D12

27

D13

26

D14

25
24

D15

23

RS
MSB

22

LDAC

21

A1

20

Figure 4. AD5547 TSSOP-38 Pin Configuration

Table 3. AD5547 Pin Function Descriptions

Pin No. Mnemonic Function

1, 2, 24–

D0–D15 Digital Input Data Bits D0 to D15. Signal level must be ≤ V

28, 30–38
3 R

4 R
5 R1A

OFSA

Internal Matching Feedback Resistor A. Connects to the external op amp for I-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
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 versus code. In 4-quadrant mode, V
reference amplifier.

8 I

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

OUTB

REFB

DAC B Reference Input Pin. Establishes DAC full-scale voltage. Constant input resistance versus 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

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

FBB

OFSB

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

and an external reference.

1B

04452-0-003

shorts to the V

1A

1A

1B

shorts to the V

1B

R

OFSA

R

R

COMA

V

REFA

I

OUTA

GND
DGND
GNDB

I

OUTB

V

REFB

R

COMB

R

R

OFSB

NC
NC

FBA

R

R

FBB

WR

1
2
3
4
5

1A

6
7
8

AD5557

9
10
11
12
13
14
15

1B

16
17
18
19

A0

TOP VIEW

(Not to Scale)

NC = NO CONNECT

38

D0
D1

37
36

D2
D3

35
34

D4
D5

33
32

D6
D7

31

D8

30

VDD

29

D9

28

D10

27

D11

26
25

D12
D13

24
23

RS
MSB

22
21

LDAC
A1

20

04452-0-004

Figure 5. AD5557 TSSOP-38 Pin Configuration

+ 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

shorts to the VREF pin. Do not connect if operating in

COMA

becomes –V

REFB

and R2B. In 4-quadrant mode, R

shorts to the VREF pin. Do not connect if operating in

COMB

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

REFB

ties to R

OFSB

. In 4-quadrant mode, R

FBA

ties to the inverting

COMA

is driven by the external

REFA

.

REF

ties to the inverting

COMB

. In 4-quadrant mode, R

FBB

OFSA

REFA

OFSB

OFSA

. Do

is the

. Do not

OFSB

Rev. 0 | Page 6 of 20