BURR-BROWN DAC1221 User Manual

查询DAC1221供应商

®

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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

DAC1221

DAC1221

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.

X

IN

Clock Generator

Microcontroller

Instruction Register
Command Register

Data Register

Offset Register

Full-Scale Register

X

OUT

V

REF

Second-Order

∆∑

Modulator

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.

C2AC2BC

First-Order

Switched

Capacitor Filter

C

1

Second-Order

Continuous

Time Post Filter

3

V

OUT

SDIO

SCLK

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]

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

Serial

Interface

CS DV

DGND AV

DD

Modulator Control

1

AGND

DD

DAC1221

®

SPECIFICATIONS

All specifications T

PARAMETER CONDITIONS MIN TYP MAX UNITS
ACCURACY

Monotonicity 16 Bits
Linearity Error
Offset Error
Offset Error Drift
Midscale Error
Midscale Error Drift
Gain Error
Gain Error Drift
Power-Supply Rejection Ratio at DC, dB = –20log(∆V

to T

MIN

, AVDD = DVDD = +3V, f

MAX

= 2.5MHz, V

XIN

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

REF

DAC1221E

(1)

(2)

(3)

(2)

(3)

(2)

(3)

V

= 20mV, CALPIN = 1

OUT

V

= V

OUT

, CALPIN = 1

REF

CALPIN = 1

(6)

(6)

(6)

50 µV/°C

±20 µV

50 µV/°C

3 ppm/°C

/∆VDD)57dB

OUT

±30 ppm of FSR

±190 µV

0.015 %

ANALOG OUTPUT

Output Voltage
Output Current

(4)
(1)

0 2 • V

±0.25 mA

REF

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

DYNAMIC PERFORMANCE

Settling Time

(1,5)

To ±0.012% 1.8 2 ms

DD

Indefinite

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

V

IH

V

IL

V

OH

V

OL

Input-Leakage Current ±10 µA

Frequency Range (f

X

IN

Data Format User Programmable Offset Two’s Complement

)

IN

2.0 DVDD + 0.3 V

–0.3 0.8 V

IOH = –0.8mA 2.4 V

IOL = 1.6mA 0.4 V

) 1.0 2.5 MHz

XIN

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

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

REF

V

®

DAC1221

2

PIN CONFIGURATION

PIN DESCRIPTIONS

Top View SSOP

DV

1

DD

X

2

OUT

X

3

IN

4

DGND

AV

DNC

C

DD

C

3

2B

DAC1221E

5
6
7
8

ABSOLUTE MAXIMUM RATINGS

AV

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

DD

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

AV

DD

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

DV

DD

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

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

V

REF

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

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

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

Maximum Junction Temperature (T
Thermal Resistance,

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

θ

JA

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

JMAX

SCLK

16

SDIO

15

CS

14

AGND

13

V

12

REF

11

V

OUT

10

C

2A

9

C

1

(1)

+ 0.3V

DD

+ 0.3V

DD

– TA)/

JMAX

θ

JA

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.

PIN NAME DESCRIPTION

1DV
2X
3X

OUT

IN

Digital Supply, +3V nominal

DD

Digital, System Clock Output

Digital, System Clock Input
4 DGND Digital Ground
5AV

Analog Supply, +3V nominal

DD

6 DNC Do Not Connect
7C
8C

2B

9C

10 C
11 V
12 V

2A
OUT
REF

Analog, Filter Capacitor

3

Analog, Filter Capacitor
Analog, Filter Capacitor

1

Analog, Filter Capacitor
Analog Output Voltage

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

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.

PACKAGE/ORDERING INFORMATION

PACKAGE SPECIFIED

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

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.

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.

(1)

MEDIA

®

3

DAC1221

TYPICAL PERFORMANCE CURVES

FULL SCALE OUTPUT SWING

Time (ms)

01234

Output (V)

3.0

2.5

2.0

1.5

1.0

0.5

0

At TA = +25°C, AVDD = DVDD = +3.0V, f

POWER SUPPLY REJECTION RATIO vs FREQUENCY

70

60

50

40

30

PSRR (dB)

20

10

0

10 100 1000 10000 100000

Frequency (Hz)

SETTLING TIME: 20mV to FS

300

0

= 2.5MHz, V

XIN

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

REF

1500

1200

SETTLING TIME: FS to 20mV

–300

–600

–900

∆ Around FS (µV)

–1200

–1500

0246810

Time (ms)

10000

1000

100

Noise (nv/√Hz)

10

1

OUTPUT NOISE VOLTAGE vs FREQUENCY

10 100 1000 10000 10000

Frequency (Hz)

900

600

300

∆ Around 20mV (µV)

0

–300

0246810

Time (ms)

4

2

0

–2

Offset (mV)

–4

–6

OFFSET vs TEMPERATURE

(can be corrected with calibration)

–25 25 75–50 0 50 100

Temperature (°C)

®

DAC1221

4

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

TYPICAL PERFORMANCE CURVES

At TA = +25°C, AVDD = DVDD = +3.0V, f

0.020

0.015

0.010

0.005

0.000

Gain Error (%)

–0.005

–0.010

–0.015

–50 –25

GAIN ERROR vs TEMPERATURE

(can be corrected with calibration)

0507525 100

Temperature (°C)

= 2.5MHz, V

XIN

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

REF

®

5

DAC1221