Datasheet

ManualsBrandsANALOG DEVICES ManualsData collecting ICsData acquisition IC - DA converter (DAC) TSSOP 38

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

Multiplying DACs with 4-Quadrant Resistors

Data Sheet

AD5547/AD5557

Rev. D Document Feedback

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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

= 10 µA max

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

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

FUNCTIONAL BLOCK DIAGRAM

DAC A

D0..D15

D0..D13

DAC A

DAC B

ADDR

DECODE

INPUT

DAC A

DAC B

POWER

RESET

COMB

COMA

OFSA

REFA

OFSB

04452-013

FBA

AGNDA

AGNDB

REFB

OUTA

FBB

OUTB

D0 TO D15

(AD5547)

D0 TO D13

(AD5557)

A0, A1

MSB LDACDGND

INPUT

DAC B

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

) simplifies the I-to-V conversion with

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.

VREF

–VREF

–VREF TO +VREF

04452-002

16/14 DATA

COMA

R1 R2

OFSA

FBA

RFBROFS

16-/14-BIT

DAC A

MSB A0, A1

POWER-ON

RESET

AD5547/AD5557

IOUTA

AGNDA

(ONE CHANNEL SHOWN ONLY)

VOUTA

REFA

MSB

A0, A1

LDAC

RSLDAC

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

Summary of content (20 pages)

PAGE 1
Dual-Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors AD5547/AD5557 Data Sheet FEATURES FUNCTIONAL BLOCK DIAGRAM R1A 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: IDD = 10 µA max 0.
PAGE 2
AD5547/AD5557 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 DAC Section................................................................................ 12 Applications ....................................................................................... 1 Digital Section ............................................................................ 13 Functional Block Diagram ......................................
PAGE 3
Data Sheet AD5547/AD5557 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VDD = 2.7 V to 5.5 V, IOUT = virtual GND, GND = 0 V, VREF = −10 V to +10 V, TA = −40°C to +125°C, unless otherwise noted. Table 1.
PAGE 4
AD5547/AD5557 Data Sheet Parameter SUPPLY CHARACTERISTICS Power Supply Range Positive Supply Current Power Dissipation Power Supply Sensitivity AC CHARACTERISTICS4 Output Voltage Settling Time Symbol Test Conditions/Comments VDD RANGE IDD PDISS PSS Logic inputs = 0 V Logic inputs = 0 V ∆VDD = ±5% Typ 2.7 tS Reference Multiplying BW DAC Glitch Impulse Multiplying Feedthrough Error Digital Feedthrough Total Harmonic Distortion Output Noise Density Analog Crosstalk Min To ±0.
PAGE 5
Data Sheet AD5547/AD5557 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter VDD to GND RFB, ROFS, R1, RCOM, and VREF to GND Logic Inputs to GND V(IOUT) to GND Input Current to Any Pin except Supplies Thermal Resistance (θJA)1 Maximum Junction Temperature (TJ MAX) Operating Temperature Range Storage Temperature Range Lead Temperature Vapor Phase, 60 sec Infrared, 15 sec 1 Rating −0.3 V to +8 V −18 V to +18 V −0.3 V to +8 V −0.3 V to VDD + 0.
PAGE 6
AD5547/AD5557 Data Sheet D1 1 38 D2 D0 2 37 D3 ROFSA 3 36 D4 RFBA 4 35 D5 R1A 5 34 D6 RCOMA 6 33 D7 VREFA 7 32 D8 IOUTA 8 31 D9 30 D10 29 VDD 28 D11 IOUTB 12 27 D12 VREFB 13 26 D13 RCOMB 14 25 D14 R1B 15 24 D15 RFBB 16 23 RS ROFSB 17 22 MSB WR 18 21 LDAC A0 19 20 A1 AGNDA 9 DGND 10 AGNDA 11 AD5547 TOP VIEW (Not to Scale) 04452-003 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 4. AD5547 Pin Configuration Table 3.
PAGE 7
Data Sheet Pin No. 19 20 21 22 Mnemonic A0 A1 LDAC MSB 23 RS 29 VDD AD5547/AD5557 Function Address Pin 0. Signal level must be ≤VDD + 0.3 V. Address Pin 1. Signal level must be ≤VDD + 0.3 V. Digital Input Load DAC Control. Signal level must be ≤VDD + 0.3 V. Power-On Reset State. MSB = 0 corresponds to zero-scale reset; MSB = 1 corresponds to midscale reset. The signal level must be ≤VDD + 0.3 V. Active low resets both input and DAC registers.
PAGE 8
Data Sheet NC 1 38 D0 NC 2 37 D1 ROFSA 3 36 D2 RFBA 4 35 D3 R1A 5 34 D4 RCOMA 6 33 D5 VREFA 7 32 D6 IOUTA 8 31 D7 AD5557 30 D8 TOP VIEW (Not to Scale) 29 VDD 28 D9 IOUTB 12 27 D10 VREFB 13 26 D11 RCOMB 14 25 D12 R1B 15 24 D13 RFBB 16 23 RS ROFSB 17 22 MSB WR 18 21 LDAC A0 19 20 A1 AGNDA 9 DGND 10 AGNDB 11 NC = NO CONNECT 04452-004 AD5547/AD5557 Figure 5. AD5557 Pin Configuration Table 4. AD5557 Pin Function Descriptions Pin No.
PAGE 9
Data Sheet AD5547/AD5557 Pin No. 23 Mnemonic RS 24 to 28, 30 to 38 29 D13 to D0 Function Active low resets both input and DAC registers. Resets to zero-scale if MSB = 0 and resets to midscale if MSB = 1. Signal level must be ≤VDD + 0.3 V. Digital Input Data Bits D13 to D0. Signal level must be ≤VDD + 0.3 V. VDD Positive Power Supply Input. The specified range of operation is 2.7 V to 5.5 V. Table 5.
PAGE 10
AD5547/AD5557 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 1.0 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 –0.8 –1.0 0 8192 16,384 24,576 32,768 40,960 49,152 57,344 65,536 CODE (Decimal) –1.0 0 2048 4096 6144 8192 10,240 12,288 14,336 16,384 CODE (Decimal) 04452-010 DNL (LSB) 0.8 04452-019 INL (LSB) 1.0 Figure 9. AD5557 Differential Nonlinearity Error Figure 6. AD5547 Integral Nonlinearity Error 1.5 1.0 VREF = 2.5V TA = 25°C 0.8 1.
PAGE 11
Data Sheet AD5547/AD5557 3.0 SUPPLY CURRENT (mA) 2.5 LDAC 1 2.0 0x5555 1.5 2 0x8000 1.0 0xFFFF 0x0000 VOUT 0 10k 100k 1M 10M 100M CLOCK FREQUENCY (Hz) M 200ns A CH1 2.70V B CH1 –6.20V 400.00ns 04452-024 CH1 5.00V CH2 2.00V 04452-025 0.5 Figure 15. Settling Time from Full Scale to Zero Scale Figure 12. AD5547 Supply Current vs. Clock Frequency –3.85 90 VDD = 5V ± 10% VREF = 10V 80 –3.90 70 –3.95 VOUT (V) PSRR (–dB) 60 50 40 –4.00 –4.05 30 –4.
PAGE 12
AD5547/AD5557 Data Sheet CIRCUIT OPERATION The reference voltage inputs exhibit a constant input resistance of 5 kΩ ± 20%. The impedance of IOUT, the DAC output, is code dependent. External amplifier choice should take into account the variation of the AD5547/AD5557 output impedance. The feedback resistance in parallel with the DAC ladder resistance dominates output voltage noise. To maintain good analog performance, it is recommended that the power supply is bypassed with a 0.01 µF to 0.
PAGE 13
Data Sheet AD5547/AD5557 The AD5547/AD5557 have 16-/14-bit parallel inputs. The devices are double buffered with 16-/14-bit registers. The double buffered feature allows the simultaneous update of several AD5547s/ AD5557s. For the AD5547, the input register is loaded directly from a 16-bit controller bus when WR is brought low. The DAC register is updated with data from the input register when LDAC is brought high. Updating the DAC register updates the DAC output with the new data (see Figure 18).
PAGE 14
AD5547/AD5557 Data Sheet APPLICATIONS INFORMATION UNIPOLAR MODE In this case, the output voltage polarity is opposite the VREF polarity (see Figure 21). Table 7 shows the negative output vs. code for the AD5547.
PAGE 15
Data Sheet AD5547/AD5557 2-Quadrant Multiplying Mode, VOUT = 0 V to +VREF Table 8 shows the positive output vs. code for the AD5547. The AD5547/AD5557 are designed to operate with either positive or negative reference voltages. As a result, a positive output can be achieved with an additional op amp, (see Figure 22); the output becomes Table 8. AD5547 Unipolar Mode Positive Output vs.
PAGE 16
AD5547/AD5557 Data Sheet BIPOLAR MODE 4-Quadrant Multiplying Mode, VOUT = –VREF to +VREF Table 9 shows some of the results for the 16-bit AD5547. The AD5547/AD5557 contain on-chip all the 4-quadrant resistors necessary for precision bipolar multiplying operation. Such a feature minimizes the number of exponent components to only a voltage reference, dual op amp, and compensation capacitor (see Figure 23).
PAGE 17
Data Sheet AD5547/AD5557 AC Reference Signal Attenuator System Calibration Besides handling the digital waveform decoded from the parallel input data, the AD5547/AD5557 can also handle low frequency ac reference signals for signal attenuation, channel equalization, and waveform generation applications. The maximum signal range can be up to ±18 V (see Figure 24). The initial accuracy of the system can be adjusted by trimming the voltage reference ADR0x with a digital potentiometer (see Figure 25).
PAGE 18
AD5547/AD5557 Data Sheet 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 10 lists some of the references available from Analog Devices, Inc., that are suitable for use with this range of current output DACs.
PAGE 19
Data Sheet AD5547/AD5557 Table 12. Suitable Analog Devices High Speed Op Amps Part No. AD8065 AD8066 AD8021 AD8038 ADA4899 AD8057 AD8058 AD8061 AD8062 AD9631 Supply Voltage (V) 5 to 24 5 to 24 5 to 24 3 to 12 5 to 12 3 to 12 3 to 12 2.7 to 8 2.7 to 8 ±3 to ±6 BW @ ACL (MHz) 145 145 490 350 600 325 325 320 320 320 Slew Rate (V/µs) 180 180 120 425 310 1000 850 650 650 1300 VOS (Max) (µV) 1500 1500 1000 3000 35 5000 5000 6000 6000 10,000 IB (Max) (nA) 0.006 0.
PAGE 20
AD5547/AD5557 Data Sheet OUTLINE DIMENSIONS 9.80 9.70 9.60 20 38 4.50 4.40 4.30 6.40 BSC 1 19 PIN 1 1.20 MAX 0.15 0.05 COPLANARITY 0.10 0.50 BSC 0.27 0.17 SEATING PLANE 0.20 0.09 8° 0° 0.70 0.60 0.45 COMPLIANT TO JEDEC STANDARDS MO-153-BD-1 Figure 26.