ad7303brm-reel Analog Devices, Inc., ad7303brm-reel Datasheet

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ad7303brm-reel

Manufacturer Part Number
ad7303brm-reel
Description
+2.7 V To +5.5 V, Serial Input, Dual Voltage Output 8-bit Dac
Manufacturer
Analog Devices, Inc.
Datasheet

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Part Number:
ad7303brm-reel7
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a
GENERAL DESCRIPTION
The AD7303 is a dual, 8-bit voltage out DAC that operates
from a single +2.7 V to +5.5 V supply. Its on-chip precision out-
put buffers allow the DAC outputs to swing rail to rail. This de-
vice uses a versatile 3-wire serial interface that operates at clock
rates up to 30 MHz, and is compatible with QSPI, SPI, microwire
and digital signal processor interface standards. The serial input
register is sixteen bits wide; 8 bits act as data bits for the DACs,
and the remaining eight bits make up a control register.
The on-chip control register is used to address the relevant
DAC, to power down the complete device or an individual
DAC, to select internal or external reference and to provide a
synchronous loading facility for simultaneous update of the
DAC outputs with a software LDAC function.
The low power consumption of this part makes it ideally suited
to portable battery operated equipment. The power consump-
tion is 7.5 mW max at 3 V, reducing to less than 3 W in full
power-down mode.
The AD7303 is available in an 8-pin plastic dual in-line pack-
age, 8-lead SOIC and microSOIC packages.
QSPI and SPI are trademarks of Motorola.
Microwire is a trademark of National Semiconductor.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Two 8-Bit DACs in One Package
8-Pin DIP/SOIC and microSOIC Packages
+2.7 V to +5.5 V Operation
Internal & External Reference Capability
Individual DAC Power-Down Function
Three-Wire Serial Interface
On-Chip Output Buffer
On-Chip Control Register
Low Power Operation: 2.3 mA @ 3.3 V
Full Power-Down to 1 A max, typically 80 nA
APPLICATIONS
Portable Battery Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage and Current Sources
Programmable Attenuators
QSPI™, SPI™ and Microwire™ Compatible
Rail-to-Rail Operation
+2.7 V to +5.5 V, Serial Input, Dual
PRODUCT HIGHLIGHTS
1. Low power, single supply operation. This part operates from
2. The on-chip output buffer amplifiers allow the outputs of the
3. Internal or external reference capability.
4. High speed serial interface with clock rates up to 30 MHz.
5. Individual power-down of each DAC provided. When com-
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
SYNC
SCLK
a single +2.7 V to +5.5 V supply and consumes typically
15 mW at 5.5 V, making it ideal for battery powered
applications.
DACs to swing rail to rail with a settling time of typically 1.2 s.
pletely powered down, the DAC consumes typically 80 nA.
DIN
AD7303
DATA (8)
FUNCTIONAL BLOCK DIAGRAM
Voltage Output 8-Bit DAC
16-BIT SHIFT REGISTER
REGISTER
REGISTER
INPUT
INPUT
GND
World Wide Web Site: http://www.analog.com
CONTROL (8)
REGISTER
REGISTER
DAC
DAC
REF
I DAC A
I DAC B
MUX
© Analog Devices, Inc., 1997
AD7303
V
POWER ON
2
DD
RESET
I/V
I/V
V
V
OUT
OUT
A
B

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ad7303brm-reel Summary of contents

Page 1

... DAC consumes typically 80 nA. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 AD7303 DAC I DAC A I OUT DAC I DAC I/V OUT POWER ON MUX RESET 2 REF V DD © Analog Devices, Inc., 1997 ...

Page 2

... Gain Error is specified between Codes 15 and 245. The actual error at Code 15 is typically 3 LSB. 4 Internal Voltage Reference Error = (Actual V REF is selected. Specifications subject to change without notice. Model AD7303BN AD7303BR AD7303BRM *N = Plastic DIP SOIC microSOIC +2 +5.5 V, Internal Reference GND; all specifications T MIN 1 B Versions ...

Page 3

TIMING CHARACTERISTICS Parameter Limit MIN 4 4 NOTES 1 Sample tested at +25 C ...

Page 4

AD7303 ABSOLUTE MAXIMUM RATINGS +25 C unless otherwise noted GND . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 5

TERMINOLOGY INTEGRAL NONLINEARITY For the DACs, relative accuracy or endpoint nonlinearity is a measure of the maximum deviation, in LSBs, from a straight line passing through the endpoints of the DAC transfer func- tion. A graphical representation of the transfer ...

Page 6

AD7303–Typical Performance Characteristics 800 V = +5V AND +3V 720 DD INTERNAL REFERENCE 640 DAC LOADED WITH 00HEX 560 480 400 320 249 160 SINK CURRENT – mA ...

Page 7

V = +5V DD INTERNAL REFERENCE DAC A = NORMAL OPERATION SYNC DAC B INITIALLY IN POWER 2 DOWN DAC B EXITING POWER DOWN V B OUT 1 CH1 2V, CH2 5V, M 500ns ...

Page 8

AD7303 GENERAL DESCRIPTION D/A Section The AD7303 is a dual 8-bit voltage output digital-to-analog converter. The architecture consists of a reference amplifier and a current source DAC, followed by a current-to-voltage con- verter capable of generating rail-to-rail voltages on the ...

Page 9

SERIAL INTERFACE The AD7303 contains a versatile 3-wire serial interface that is compatible with SPI, QSPI and Microwire interface stan- dards as well as a host of digital signal processors. An active low SYNC enables the shift register to receive ...

Page 10

AD7303 DB15 (MSB) X LDAC PDB PBA INT/EXT |––––––––––––––––––––––––– Control Bits –––––––––––––––––––––––––|––––––––––––––––––––––––– Data Bits –––––––––––––––––––––––––| Bit Location Mnemonic DB15 INT/EXT DB14 X DB13 LDAC DB12 PDB DB11 PDA DB10 A/B DB9 CR1 DB8 CR0 DB7–DB0 Data CONTROL BITS LDAC A/B ...

Page 11

POWER-ON RESET The AD7303 has a power-on reset circuit designed to allow output stability during power-up. This circuit holds the DACs in a reset state until a write takes place to the DAC. In the reset state all zeros are ...

Page 12

AD7303 AD7303 to Microwire Interface Figure 29 shows an interface between the AD7303 and any microwire compatible device. Serial data is shifted out on the falling edge of the serial clock and is clocked into the AD7303 on the rising ...

Page 13

REGULATOR POWER V DD 10k SCLK SCLK V DD 10k SYNC SYNC V DD 10k DATA DIN Figure 32. AD7303 in Opto-Isolated Interface Decoding Multiple AD7303 The SYNC pin on the AD7303 can be used in applications to decode ...

Page 14

AD7303 Power Supply Bypassing and Grounding In any circuit where accuracy is important, careful consideration of the power supply and ground return layout helps to ensure the rated performance. The printed circuit board on which the AD7303 is mounted should ...

Page 15

LDAA #$18 * LDAA #$53 STAA SPCR * BSR UPDATE JMP #$E000 * UPDATE PSHX PSHY PSHA * LDAA #$00 STAA DIN 1 LDAA #$AA STAA DIN 2 * LDX #DIN1 LDY #$1000 * BCLR PORTC,Y $80 TRANSFER LDAA 0,X ...

Page 16

AD7303 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Pin Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) 0.300 (7.62) 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) ...

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