max5259

Manufacturer Part Numbermax5259
Description+3v/+5v, Low-power, 8-bit Octal Dacs With Rail-to-rail Output Buffers
ManufacturerMaxim Integrated Products, Inc.
max5259 datasheet
 
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19-1844; Rev 1; 4/01
+3V/+5V, Low-Power, 8-Bit Octal DACs
General Description
The MAX5258/MAX5259 are +3V/+5V single-supply,
digital serial-input, voltage-output, 8-bit octal digital-to-
analog converters (DACs). Internal precision buffers
®
swing Rail-to-Rail
, and the reference input range
extends from ground to the positive supply. The +5V
(MAX5258) and the +3V (MAX5259) feature a 10µA
(max) shutdown mode.
The serial interface is double-buffered. A 16-bit input
shift register is followed by eight 8-bit input registers
and eight 8-bit DAC registers. The 16-bit serial word
consists of two “don’t care” bits, three address bits,
three control bits, and eight data bits. The input and
DAC registers can both be updated independently or
simultaneously with a single software command. The
asynchronous control input (LDAC) provides simultane-
ous updating of all eight DAC registers.
The interface is compatible with SPI™, QSPI™ (CPOL =
CPHA = 0 or CPOL = CPHA = 1), and MICROWIRE™.
A buffered digital data output allows daisy-chaining of
serial devices.
The MAX5258/MAX5259 are available in a 16-pin QSOP
package.
________________________Applications
Digital Gain and Offset Adjustment
Programmable Attenuators
Programmable Current Sources
Portable Instruments
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
with Rail-to-Rail Output Buffers
o +2.7V to +5.5V Single-Supply Operation
o Low Supply Current: 1.3mA
o Low-Power Shutdown Mode
0.54mA (MAX5259)
0.80mA (MAX5258)
o ±1LSB DNL (max)
o ±1LSB INL (max)
o Ground to V
o Output Buffer Amplifiers Swing Rail-to-Rail
o 10MHz Serial Interface, SPI, QSPI (CPOL = CPHA
= 0 or CPOL = CPHA = 1), and MICROWIRE-
Compatible
o Double-Buffered Registers for Synchronous
Updating
o Serial Data Output for Daisy-Chaining
o Ultra-Small 16-Pin QSOP Package
PART
MAX5258EEE -40
MAX5259EEE -40
TOP VIEW
OUTB
OUTA
LDAC
OUTE
OUTF
Features
Reference Input Range
DD
Ordering Information
SU PPL Y
VO LT A G E
TEMP. RANGE PIN- PACK AGE
( V)
o
o
C to +85
C
16 QSOP
+5.0
o
o
C to +85
C
16 QSOP
+3.0
Pin Configuration
1
16
OUTC
2
15
OUTD
GND
3
14
DOUT
MAX5258
V
4
13
DIN
DD
MAX5259
REF
5
12
SCLK
CS
6
11
7
10
OUTH
8
9
OUTG
QSOP
1

max5259 Summary of contents

  • Page 1

    ... Rail-to-Rail , and the reference input range extends from ground to the positive supply. The +5V (MAX5258) and the +3V (MAX5259) feature a 10µA (max) shutdown mode. The serial interface is double-buffered. A 16-bit input shift register is followed by eight 8-bit input registers and eight 8-bit DAC registers. The 16-bit serial word consists of two “ ...

  • Page 2

    Low-Power, 8-Bit Octal DAC with Rail-to-Rail Output Buffers ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD DIN, DOUT, CS, SCLK, LDAC to GND.....................-0.3V to +6V REF to GND ................................................-0. OUT_ to GND ...........................................................-0. ...

  • Page 3

    Low-Power, 8-Bit Octal DAC ELECTRICAL CHARACTERISTICS (MAX5258) (continued +4.5V to +5.5V +4.096V, GND = REF values are +5V and T = +25°C PARAMETER SYMBOL Input Current Input ...

  • Page 4

    ... Low-Power, 8-Bit Octal DAC with Rail-to-Rail Output Buffers ELECTRICAL CHARACTERISTICS (MAX5259 +2.7V to +3.3V +2.5V, GND = REF are +3V, and T = +25°C PARAMETER SYMBOL STATIC ACCURACY Resolution Integral Non Linearity (Note 1) INL Differential Non Linearity (Note 1) DNL Zero-Code Error ZCE ...

  • Page 5

    ... Low-Power, 8-Bit Octal DAC ELECTRICAL CHARACTERISTICS (MAX5259) (continued +2.7V to +3.3V +2.5V, GND = REF are +3V, and T = +25°C PARAMETER SYMBOL Digital Feedthrough Digital-to-Analog Glitch Impulse Signal-to-Noise Plus Distortion SINAD Ratio Multiplying Bandwidth Wideband Amplifier Noise POWER REQUIREMENTS Power-Supply Voltage ...

  • Page 6

    ... Low-Power, 8-Bit Octal DAC with Rail-to-Rail Output Buffers TIMING CHARACTERISTICS (MAX5259 +2.5V, GND = 100pF, T REF DOUT T = +25°C.) A PARAMETER SYMBOL V Rise-to-CS Fall-Setup Time t DD VDCS LDAC Pulse Width Low t LDAC CS Rise-to-LDAC Fall-Setup Time t CLL (Note 4) CS Pulse Width High ...

  • Page 7

    Low-Power, 8-Bit Octal DAC (T = +25°C, unless otherwise noted.) A DAC ZERO-CODE OUTPUT VOLTAGE vs. OUTPUT SINK CURRENT 800 V = +3V DD 700 600 500 400 300 200 100 DAC OUTPUT ...

  • Page 8

    Low-Power, 8-Bit Octal DAC with Rail-to-Rail Output Buffers (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. REFERENCE VOLTAGE (V = +5V) DD 1.8 1.6 1.4 ALL DAC CODES = FF HEX 1.2 1.0 0.8 ALL DAC CODES ...

  • Page 9

    Low-Power, 8-Bit Octal DAC (T = +25°C, unless otherwise noted.) A WORST-CASE 1LSB DIGITAL STEP CHANGE (NEGATIVE) CS OUTA 1µs/div +4.5V REF POSITIVE SETTLING TIME CS OUTA 2µs/div ...

  • Page 10

    ... DOUT remains unchanged. CS must go low at least 40ns before the first rising edge of the clock pulse to properly clock in the first bit. With CS low, data is clocked into the MAX5258/MAX5259’s internal shift register on the rising edge of the external serial clock. Always clock in the full 16 bits. ...

  • Page 11

    Low-Power, 8-Bit Octal DAC CS SCLK DIN DACA DOUT MODE ...

  • Page 12

    Low-Power, 8-Bit Octal DAC with Rail-to-Rail Output Buffers Table 1. Serial-Interface Programming Commands 16-BIT SERIAL WORD ...

  • Page 13

    ... X) The no-operation (NOP) command allows data to be shifted through the MAX5258/MAX5259 shift register without affecting the input or DAC registers. This is useful in daisy-chaining (see the Daisy-Chaining Devices section). For this command, the data bits are "Don’t Cares." example, three MAX5258s are daisy-chained (A, B, and C), and devices A and C need to be updated ...

  • Page 14

    Low-Power, 8-Bit Octal DAC with Rail-to-Rail Output Buffers Don’t Care 1 (LDAC = X) All eight DAC registers are updated with shift-register data. This command allows all DACs to be set to any analog value ...

  • Page 15

    ... DAC registers of the passing device. A 3-wire interface updates daisy-chained or individual MAX5258/MAX5259s simultaneously by bringing CS high (Figure 7). The MAX5258/MAX5259 use a matrix decoding archi- tecture for the DACs, which saves power in the overall system. The external reference voltage is divided down by a resistor string placed in a matrix fashion. Row and ...

  • Page 16

    ... CS MAX5258/ LDAC MAX5259 SCLK DIN SK MICROWIRE MAX5258/ SO PORT MAX5259 I/O Figure 6. Connections for SPI/QSPI MAX5258/ MAX5259 SCLK DOUT DIN CS DEVICE B MAX5258/ MAX5259 SCLK SCLK DIN DIN OTHER SERIAL DEVICES CS MAX5258/ LDAC MAX5259 SCLK DIN SPI/QSPI DIN MOSI PORT SCLK SCK CS ...

  • Page 17

    ... Figure 10 shows suggested circuit board layout DOUT to minimize crosstalk. DIN In unipolar operation, the output voltages and the refer- ence input are the same polarity. Figure 11 shows the MAX5258/MAX5259 unipolar configuration, and Table 2 shows the unipolar code OUTPUT O DAC CODE ...

  • Page 18

    ... Low-Power, 8-Bit Octal DAC with Rail-to-Rail Output Buffers +3V REFERENCE INPUT REF V DD DAC A DAC B DAC C DAC D DAC E DAC F DAC G DAC H MAX5258/ MAX5259 Figure 11. Unipolar Output Circuit 18 ______________________________________________________________________________________ Table 2. Unipolar Code Table DAC CONTENTS MSB LSB 1111 1111 OUT A 1000 0001 1000 0000 0111 ...

  • Page 19

    ... DAC A A DAC REGISTER DAC B B DAC REGISTER DAC C C DAC REGISTER DAC D D DAC REGISTER DAC E E DAC REGISTER DAC F F DAC REGISTER DAC G G DAC DAC H REGISTER H MAX5258/ MAX5259 GND OUT A OUT B OUT C OUT D OUT E OUT F OUT G OUT H 19 ...

  • Page 20

    Low-Power, 8-Bit Octal DAC with Rail-to-Rail Output Buffers Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the ...