Datasheet

ManualsBrandsANALOG DEVICES ManualsData collecting ICsData acquisition IC - DA converter (DAC) TSSOP 28

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

Multiplying DACs with Four-Quadrant Resistors

Data Sheet

AD5546/AD5556

Rev. D

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: 781.329.4700 www.analog.com

FEATURES

16-bit resolution

14-bit resolution

2- or 4-quadrant 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

= 10 μA

0.5 μs settling time

Built-in R

facilitates current-to-voltage conversion

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

REF

= 10 V

Automotive operating temperature: –40°C to +125°C

Compact TSSOP-28 package

APPLICATIONS

Automatic test equipment

Instrumentation

Digitally controlled calibration

Digital waveform generation

FUNCTIONAL BLOCK DIAGRAM

DAC

AD5546/

AD5556

LDAC

MSB RS

DB0 TO DB15

CONTROL

LOGIC

DAC

POR

16/14

R1 R2

OFS

R1 R

COM

REF R

OFS

OUT

GND

03810-001

Figure 1. AD5546/AD5556 Simplified Block Diagram

GENERAL DESCRIPTION

The AD5546/AD5556 are precision 16-/14-bit, multiplying, low

power, current output, parallel input digital-to-analog converters

(DACs). They operate from a single 2.7 V to 5.5 V supply with

±10 V multiplying references for four-quadrant outputs. Built-

in four-quadrant resistors facilitate the resistance matching and

temperature tracking that minimize the number of components

needed for multiquadrant applications. The feedback resistor

) simplifies the I-V conversion with an external buffer. The

AD5546/AD5556 are packaged in compact TSSOP-28 packages

with operating temperatures from –40°C to +125°C.

The EVAL-AD5546SDZ is available for evaluating DAC perfor-

mance. For more information, see the UG-309 evaluation board

user guide.

03810-024

OFS

OFSA

VOUT

FBA

GND

AD5546/AD5556

OUT

R2R1

COMA

R1A

16-/14-BIT

DATA

16-/14-BIT

DATA

VREFA

U2B

OP2177

–

1µF

0.1µF

1µF

0.1µF

+15V

–15V

LDAC

MSB

0.1µF

1µF

V+

V–

U2A

OP2177

–

+5V

+10V

–

10V

Figure 2. 16-/14-Bit, Four-Quadrant Multiplying DAC with a Minimum of External Components

Summary of content (20 pages)

PAGE 1
Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with Four-Quadrant Resistors AD5546/AD5556 Data Sheet FEATURES FUNCTIONAL BLOCK DIAGRAM R1 16-bit resolution 14-bit resolution 2- or 4-quadrant 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: IDD = 10 μA 0.
PAGE 2
AD5546/AD5556 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Digital Section ............................................................................ 11 Applications ....................................................................................... 1 ESD Protection Circuits ............................................................ 11 Functional Block Diagram .............................................
PAGE 3
Data Sheet AD5546/AD5556 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VDD = 2.7 V to 5.5 V, IOUT = virtual GND, GND = 0 V, VREF = –10 V to 10 V, TA = full operating temperature range, unless otherwise noted. Table 1.
PAGE 4
AD5546/AD5556 Parameter RS Pulse Width WR to LDAC Delay Time SUPPLY CHARACTERISTICS Power Supply Range Positive Supply Current Power Dissipation Power Supply Sensitivity AC CHARACTERISTICS4 Output Voltage Settling Time Reference Multiplying BW DAC Glitch Impulse Multiplying Feedthrough Error Digital Feedthrough Total Harmonic Distortion Output Noise Density Data Sheet Symbol tRS tLWD VDD RANGE IDD PDISS PSS tS Conditions VDD = 5 V VDD = 3 V VDD = 5 V VDD = 3 V Min 20 35 0 0 Typ 2.
PAGE 5
Data Sheet AD5546/AD5556 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter VDD to GND RFB, ROFS, R1, RCOM, and REF to GND Logic Inputs to GND V (IOUT) to GND Input Current to Any Pin Except Supplies Thermal Resistance (θJA) Maximum Junction Temperature (TJ MAX) Operating Temperature Range Storage Temperature Range Lead Temperature: Vapor Phase, 60 s Infrared, 15 s Package Power Dissipation Rating –0.3 V, +8 V –18 V, 18 V –0.3 V, +8 V –0.3 V, VDD + 0.
PAGE 6
AD5546/AD5556 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS D7 1 28 VDD D5 1 28 VDD D6 2 27 D8 D4 2 27 D6 D5 3 26 D9 D3 3 26 D7 D4 4 25 D10 D2 4 25 D8 D2 6 AD5546 24 D11 D1 5 23 D12 D0 6 22 D13 TOP VIEW D0 8 (Not to Scale) 21 D14 D1 7 RFB 10 R1 11 RCOM 12 20 D15 19 GND 18 RS 17 MSB REF 13 16 WR IOUT 14 15 LDAC 24 D9 23 D10 22 D11 NC 7 TOP VIEW NC 8 (Not to Scale) 21 D12 03810-003 ROFS 9 AD5556 ROFS 9 20 D13 RFB 10 19 GND R1 11 18 RS RCOM 12 17
PAGE 7
Data Sheet Pin No. 13 Mnemonic REF 14 15 16 IOUT LDAC WR 17 MSB 18 RS 19 20 to 27 28 GND D13 to D6 VDD AD5546/AD5556 Description DAC Reference Input in Two-Quadrant Mode and R2 Terminal in Four-Quadrant Mode. In two-quadrant mode, this pin is the reference input with constant input resistance vs. code. In four-quadrant mode, this pin is driven by the external reference amplifier. DAC Current Output. Connects to the inverting node of an external op amp for I-V conversion.
PAGE 8
AD5546/AD5556 Data Sheet 1.0 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 –0.2 0 –0.2 –0.4 –0.4 –0.6 –0.6 –0.8 0 8192 –0.8 –1.0 16,384 24,576 32,768 40,960 49,152 57,344 65,536 CODE (Decimal) 0 8192 10,240 12,288 14,336 16,384 1.5 VREF = 2.5V TA = 25°C 0.8 1.0 LINEARITY ERROR (LSB) 0.6 0.4 DNL (LSB) 6144 Figure 9. AD5556 Differential Nonlinearity Error 1.0 0.2 0 –0.2 –0.4 –0.6 0.5 INL 0 DNL –0.5 –1.0 GE 03810-007 –0.8 0 8192 –1.
PAGE 9
Data Sheet AD5546/AD5556 3.0 –3.80 –3.85 –3.90 2.0 –3.95 0x5555 VOUT (V) SUPPLY CURRENT (mA) 2.5 1.5 0x8000 –4.00 –4.05 1.0 0xFFFF 0x0000 –4.10 0.5 100k 1M 10M –4.20 –200 100M 03810-115 03810-012 0 10k –4.15 –100 CLOCK FREQUENCY (Hz) 0 100 200 300 400 TIME (ns) Figure 12. AD5546 Supply Current vs. Clock Frequency Figure 15.
PAGE 10
AD5546/AD5556 Data Sheet CIRCUIT OPERATION variation of the AD5546/AD5556 output impedance. The feedback resistance in parallel with the DAC ladder resistance dominates output voltage noise. To maintain good analog performance, it is recommended to bypass the power supply with a 0.01 μF to 0.1 μF ceramic or chip capacitor in parallel with a 1 μF tantalum capacitor. Also, to minimize gain error, PCB metal traces between VREF and RFB should match.
PAGE 11
Data Sheet AD5546/AD5556 DIGITAL SECTION The AD5546/AD5556 have 16-/14-bit parallel inputs. The devices are double buffered with 16-/14-bit registers. The double-buffered feature allows the update of several AD5546/AD5556 simultaneously. For the AD5546, the input register is loaded directly from a 16-bit controller bus when the WR pin is brought low. The DAC register is updated with data from the input register when LDAC is brought high.
PAGE 12
AD5546/AD5556 Data Sheet APPLICATIONS INFORMATION UNIPOLAR MODE Two-Quadrant Multiplying Mode, VOUT = 0 V to +VREF Two-Quadrant Multiplying Mode, VOUT = 0 V to –VREF The AD5546/AD5556 DAC architecture uses a current-steering R-2R ladder design that requires an external reference and op amp to convert the unipolar mode of output voltage to The AD5546/AD5556 are designed to operate with either positive or negative reference voltages.
PAGE 13
Data Sheet AD5546/AD5556 + U2A OP2177 – +10V C7 –10V RCOMA R1A VREFA ROFSA RFBA +15V C4 1µF C6 +5V ROFS R2 R1 RFB VDD C2 0.1µF IOUT 16-/14-BIT DATA U1 – AD5546/AD5556 C5 0.1µF V+ U2B VOUT OP2177 GND + 16-/14-BIT DATA V– C8 1µF WR LDAC RS MSB WR LDAC RS MSB C9 0.1µF 03810-024 C1 1µF –15V Figure 20.
PAGE 14
AD5546/AD5556 Data Sheet ac reference signals for signal attenuation, channel equalization, and waveform generation applications. The maximum signal range can be up to ±18 V (see Figure 22). Table 10. AD5546 Output vs.
PAGE 15
Data Sheet AD5546/AD5556 REFERENCE SELECTION When selecting a reference for use with the AD55xx series of current output DACs, pay attention to the output voltage temperature coefficient specification of the reference. Choosing a precision reference with a low output temperature coefficient minimizes error sources. Table 11 lists some of the references available from Analog Devices that are suitable for use with this range of current output DACs.
PAGE 16
AD5546/AD5556 Data Sheet Table 12. Suitable Analog Devices Precision Op Amps Part No. OP97 OP1177 AD8675 AD8671 ADA4004-1 AD8603 AD8607 AD8605 AD8615 AD8616 Supply Voltage (V) ±2 to ±20 ±2.5 to ±15 ±5 to ±18 ±5 to ±15 ±5 to ±15 1.8 to 5 1.8 to 5 2.7 to 5 2.7 to 5 2.7 to 5 VOS Maximum (µV) 25 60 75 75 125 50 50 65 65 65 IB Maximum (nA) 0.1 2 2 12 90 0.001 0.001 0.001 0.001 0.001 0.1 Hz to 10 Hz Noise (µV p-p) 0.5 0.4 0.1 0.077 0.1 2.3 2.3 2.3 2.4 2.
PAGE 17
Data Sheet AD5546/AD5556 OUTLINE DIMENSIONS 9.80 9.70 9.60 28 15 4.50 4.40 4.30 6.40 BSC 1 14 PIN 1 0.65 BSC 0.15 0.05 COPLANARITY 0.10 0.30 0.19 1.20 MAX SEATING PLANE 0.20 0.09 8° 0° 0.75 0.60 0.45 COMPLIANT TO JEDEC STANDARDS MO-153-AE Figure 24.
PAGE 18
AD5546/AD5556 Data Sheet NOTES Rev.
PAGE 19
Data Sheet AD5546/AD5556 NOTES Rev.