Burr Brown Corporation DAC1221E-2K5, DAC1221 Datasheet

1

®

DAC1221

DAC1221

®

16-Bit Low Power

DIGITAL-TO-ANALOG CONVERTER

FEATURES

● 16-BIT MONOTONICITY GUARANTEED

OVER –40°C TO +85°C

● LOW POWER: 1.2mW

● VOLTAGE OUTPUT

● SETTLING TIME: 2ms to 0.012%

● MAX LINEARITY ERROR: 30ppm

● ON-CHIP CALIBRATION

APPLICATIONS

● PROCESS CONTROL

● ATE PIN ELECTRONICS

● CLOSED-LOOP SERVO-CONTROL

● SMART TRANSMITTERS

● PORTABLE INSTRUMENTS

● VCO CONTROL

DESCRIPTION

The DAC1221 is a Digital-to-Analog (D/A) converter
offering 16-bit monotonic performance over the speci­fied temperature range. It utilizes delta-sigma technol­ogy to achieve inherently linear performance in a
small package at very low power. The output range is
two times the external reference voltage. On-chip
calibration circuitry dramatically reduces offset and
gain errors.

The DAC1221 features a synchronous serial interface.
In single converter applications, the serial interface can
be accomplished with just two wires, allowing low­cost isolation. For multiple converters, a CS signal
allows for selection of the appropriate D/A converter.

The DAC1221 has been designed for closed-loop
control applications in the industrial process control
market, and high resolution applications in the test and
measurement market. It is also ideal for remote appli­cations, battery-powered instruments, and isolated sys­tems.

The DAC1221 is available in a SSOP-16 package.

© 1999 Burr-Brown Corporation PDS-1519B Printed in U.S.A. May, 2000

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone]

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

DAC1221

For most current data sheet and other product

information, visit www.burr-brown.com

Clock Generator

Serial

Interface

Second-Order

∆∑

Modulator

Instruction Register
Command Register

Data Register

Offset Register

Full-Scale Register

Microcontroller

First-Order

Switched

Capacitor Filter

Second-Order

Continuous

Time Post Filter

Modulator Control

C2AC2BC

3

C

1

X

IN

X

OUT

V

REF

CS DV

DD

DGND AV

DD

AGND

SDIO

V

OUT

SCLK

2

®

DAC1221

SPECIFICATIONS

All specifications T

MIN

to T

MAX

, AVDD = DVDD = +3V, f

XIN

= 2.5MHz, V

REF

= +1.25V, C1 = 2.2nF, C2 = 150pF, C3 = 6.8nF, unless otherwise noted.

DAC1221E
PARAMETER CONDITIONS MIN TYP MAX UNITS
ACCURACY

Monotonicity 16 Bits
Linearity Error

(1)

±30 ppm of FSR

Offset Error

(2)

V

OUT

= 20mV, CALPIN = 1

(6)

±190 µV

Offset Error Drift

(3)

50 µV/°C

Midscale Error

(2)

V

OUT

= V

REF

, CALPIN = 1

(6)

±20 µV

Midscale Error Drift

(3)

50 µV/°C

Gain Error

(2)

CALPIN = 1

(6)

0.015 %

Gain Error Drift

(3)

3 ppm/°C

Power-Supply Rejection Ratio at DC, dB = –20log(∆V

OUT

/∆VDD)57dB

ANALOG OUTPUT

Output Voltage

(4)

0 2 • V

REF

V

Output Current

(1)

±0.25 mA
Capacitive Load 500 pF
Short-Circuit Current ±10 mA
Short-Circuit Duration GND or V

DD

Indefinite

DYNAMIC PERFORMANCE

Settling Time

(1,5)

To ±0.012% 1.8 2 ms

Output-Noise Voltage 1Hz to 2kHz 45 µVrms

REFERENCE INPUT

Input Voltage 1.125 1.25 1.375 V
Input Impedance 1MΩ

DIGITAL INPUT/OUTPUT

Logic Family TTL-Compatible CMOS
Logic Levels (all except X

IN

)

V

IH

2.0 DVDD + 0.3 V

V

IL

–0.3 0.8 V

V

OH

IOH = –0.8mA 2.4 V

V

OL

IOL = 1.6mA 0.4 V
Input-Leakage Current ±10 µA
X

IN

Frequency Range (f

XIN

) 1.0 2.5 MHz

Data Format User Programmable Offset Two’s Complement

or Straight Binary

POWER SUPPLY REQUIREMENTS

Power-Supply Voltage 2.7 3.3 V
Supply Current

Analog Current 320 µA
Digital Current 70 µA

Power Dissipation Normal Mode 1.2 1.6 mW

Sleep Mode 0.25 mW

TEMPERATURE RANGE

Specified Performance –40 +85 °C

NOTES: (1) Valid from AGND + 20mV to 2 • V

REF

. (2) Applies after calibration. (3) Recalibration can remove these errors. (4) Ideal output voltage. (5) Using external

low-pass filter with 2kHz corner frequency. (6) See Command Register for description of CALPIN.

3

®

DAC1221

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

ABSOLUTE MAXIMUM RATINGS

(1)

AV

DD

to DVDD................................................................................... ±0.3V

AV

DD

to AGND ........................................................................ –0.3V to 4V

DV

DD

to DGND ....................................................................... –0.3V to 4V

AGND to DGND ............................................................................... ±0.3V

V

REF

Voltage to AGND .......................................................... 1.0V to 1.5V

Digital Input Voltage to DGND .............................. –0.3V to DV

DD

+ 0.3V

Digital Output Voltage to DGND ........................... –0.3V to DV

DD

+ 0.3V

Package Power Dissipation ............................................. (T

JMAX

– TA)/

θ

JA

Maximum Junction Temperature (T

JMAX

) ..................................... +150°C

Thermal Resistance,

θ

JA

SSOP-16............................................................................... 200°C/W

Lead Temperature (soldering, 10s) ............................................... +300°C

NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings”
may cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.

PIN CONFIGURATION

Top View SSOP

PIN DESCRIPTIONS

PIN NAME DESCRIPTION

1DV

DD

Digital Supply, +3V nominal

2X

OUT

Digital, System Clock Output

3X

IN

Digital, System Clock Input
4 DGND Digital Ground
5AV

DD

Analog Supply, +3V nominal
6 DNC Do Not Connect
7C

3

Analog, Filter Capacitor
8C

2B

Analog, Filter Capacitor
9C

1

Analog, Filter Capacitor

10 C

2A

Analog, Filter Capacitor

11 V

OUT

Analog Output Voltage

12 V

REF

Analog, Reference Input

13 AGND Analog Ground
14 CS Digital, Chip Select Input
15 SDIO Digital, Serial Data Input/Output
16 SCLK Digital, Clock Input for Serial Data Transfer

1
2
3
4
5
6
7
8

DV

DD

X

OUT

X

IN

DGND

AV

DD

DNC

C

3

C

2B

SCLK
SDIO
CS
AGND
V

REF

V

OUT

C

2A

C

1

16
15
14
13
12
11
10

9

DAC1221E

PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

(1)

MEDIA

DAC1221E SSOP-16 322 –40°C to +85°C DAC1221E DAC1221E Rails

" " " " " DAC1221E/2K5 Tape and Reel

NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces
of “DAC1221E/2K5” will get a single 2500-piece Tape and Reel.

PACKAGE/ORDERING INFORMATION

4

®

DAC1221

TYPICAL PERFORMANCE CURVES

At TA = +25°C, AVDD = DVDD = +3.0V, f

XIN

= 2.5MHz, V

REF

= 1.25V, C1 = 2.2nF, C2 = 150pF and C3 = 6.8nF.

POWER SUPPLY REJECTION RATIO vs FREQUENCY

Frequency (Hz)

10 100 1000 10000 100000

PSRR (dB)

70

60

50

40

30

20

10

0

FULL SCALE OUTPUT SWING

Time (ms)

01234

Output (V)

3.0

2.5

2.0

1.5

1.0

0.5

0

Time (ms)

SETTLING TIME: 20mV to FS

0246810

∆ Around FS (µV)

300

0

–300

–600

–900

–1200

–1500

SETTLING TIME: FS to 20mV

Time (ms)

0246810

∆ Around 20mV (µV)

1500

1200

900

600

300

0

–300

OFFSET vs TEMPERATURE

Temperature (°C)

–25 25 75–50 0 50 100

Offset (mV)

4

2

0

–2

–4

–6

(can be corrected with calibration)

OUTPUT NOISE VOLTAGE vs FREQUENCY

Frequency (Hz)

10 100 1000 10000 10000

Noise (nv/√Hz)

10000

1000

100

10

1

5

®

DAC1221

LINEARITY ERROR vs CODE

16-Bit Input Code Normalized

0

0.2 0.4 0.6 0.8 1

Linearity Error (ppm of FSR)

25

20

15

10

5

0

–5

GAIN ERROR vs TEMPERATURE

Temperature (°C)

–50 –25

0507525 100

Gain Error (%)

0.020

0.015

0.010

0.005

0.000

–0.005

–0.010

–0.015

(can be corrected with calibration)

TYPICAL PERFORMANCE CURVES

At TA = +25°C, AVDD = DVDD = +3.0V, f

XIN

= 2.5MHz, V

REF

= 1.25V, C1 = 2.2nF, C2 = 150pF and C3 = 6.8nF.