Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) QSOP 16

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General Description

The MAX5174/MAX5176 low-power, serial, voltage-out-

put, 12-bit digital-to-analog converters (DACs) feature a

precision output amplifier in a space-saving 16-pin

QSOP package. The MAX5174 operates from a single

+5V supply, and the MAX5176 operates from a single

+3V supply. Both devices draw only 280µA of supply

current, which reduces to 1µA in shutdown. In addition,

the programmable power-up reset feature allows for a

user-selectable output voltage state of either 0 or mid-

scale.

The 3-wire, digital, serial interface is compatible with

SPI™/QSPI™, and MICROWIRE™ standards. An input

buffered input, allowing the input and DAC registers to

be updated independently or simultaneously with a 16-

bit serial word. Additional features include software and

hardware shutdown, shutdown lockout, a hardware

clear pin, and a reference input capable of accepting

DC and offset AC signals. These devices provide a pro-

grammable digital output pin for added functionality

and a serial-data output pin for daisy-chaining. All logic

inputs are TTL/CMOS compatible and are internally

buffered with Schmitt triggers to allow direct interfacing

to optocouplers.

The MAX5174/MAX5176 incorporate a proprietary on-

chip circuit that keeps the output voltage virtually

“glitch free,” limiting the glitches to a few millivolts dur-

ing power-up.

Both devices are available in 16-pin QSOP packages

and are specified for the extended (-40°C to +85°C)

temperature range. The MAX5170/MAX5172 are pin-

compatible 14-bit upgrades to the MAX5174/MAX5176.

For 100% pin-compatible DACs with internal reference,

see the 13-bit MAX5130/MAX5131 and the 12-bit

MAX5120/MAX5121 data sheets.

Applications

Industrial Process Controls

Digital Offset and Gain Adjustment

Motion Control

Automatic Test Equipment (ATE)

Remote Industrial Controls

µP-Controlled Systems

Features

♦ ±1 LSB INL

♦ 1µA Shutdown Current

♦ “Glitch Free” Output Voltage at Power-Up

♦ Single-Supply Operation

+5V (MAX5174)

+3V (MAX5176)

♦ Full-Scale Output Range

+2.048V (MAX5176, V

REF

= +1.25V)

+4.096V (MAX5174, V

REF

= +2.5V )

♦ Rail-to-Rail

Output Amplifier

♦ Adjustable Output Offset

♦ Low THD (-80dB) in Multiplying Operation

♦ SPI/QSPI/MICROWIRE-Compatible 3-Wire Serial

Interface

♦ Programmable Shutdown Mode and Power-Up

Reset

♦ Buffered Output Capable of Driving 5kΩ || 100pF

Loads

♦ User-Programmable Digital Output Pin Allows

Serial Control of External Components

♦ 14-Bit Upgrades Available (MAX5170/MAX5172)

MAX5174/MAX5176

Low-Power, Serial, 12-Bit DACs

with Voltage Output

________________________________________________________________

Maxim Integrated Products

OS V

N.C.

REF

AGND

PDL

UPO

DOUT

DGND

TOP VIEW

MAX5174

MAX5176

QSOP

OUT

SHDN

CLR

DIN

SCLK

19-1475; Rev 0; 4/99

PART

MAX5174AEEE

MAX5174BEEE

MAX5176AEEE

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

Pin Configuration

Ordering Information

MAX5176BEEE -40°C to +85°C 16 QSOP

INL

(LSB)

±1

±2

±4

Functional Diagram appears at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

Summary of content (16 pages)

PAGE 1
9-1475; Rev 0; 4/99 Low-Power, Serial, 12-Bit DACs with Voltage Output The MAX5174/MAX5176 low-power, serial, voltage-output, 12-bit digital-to-analog converters (DACs) feature a precision output amplifier in a space-saving 16-pin QSOP package. The MAX5174 operates from a single +5V supply, and the MAX5176 operates from a single +3V supply. Both devices draw only 280µA of supply current, which reduces to 1µA in shutdown.
PAGE 2
MAX5174/MAX5176 Low-Power, Serial, 12-Bit DACs with Voltage Output ABSOLUTE MAXIMUM RATINGS VDD to AGND, DGND ............................................-0.3V to +6.0V AGND to DGND.....................................................-0.3V to +0.3V Digital Inputs to DGND..........................................-0.3V to +6.0V DOUT, UPO to DGND ................................-0.3V to (VDD + 0.3V) OUT, REF to AGND ...................................-0.3V to (VDD + 0.3V) OS to AGND ..........................
PAGE 3
Low-Power, Serial, 12-Bit DACs with Voltage Output (VDD = +5V ±10%, VREF = 2.5V, OS = AGND = DGND, RL = 5kΩ, CL = 100pF referenced to ground, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DYNAMIC PERFORMANCE Voltage Output Slew Rate SR Output Settling Time 0.6 To ±0.
PAGE 4
MAX5174/MAX5176 Low-Power, Serial, 12-Bit DACs with Voltage Output ELECTRICAL CHARACTERISTICS—MAX5176 (VDD = +2.7V to +3.6V, VREF = 1.25V, OS = AGND = DGND, RL = 5kΩ, CL = 100pF referenced to ground, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C).
PAGE 5
Low-Power, Serial, 12-Bit DACs with Voltage Output (VDD = +2.7V to +3.6V, VREF = 1.25V, OS = AGND = DGND, RL = 5kΩ, CL = 100pF referenced to ground, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C). PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DYNAMIC PERFORMANCE Voltage Output Slew Rate SR Output Settling Time 0.6 To ±0.
PAGE 6
Typical Operating Characteristics (MAX5174: VDD = +5V, VREF = 2.5V; MAX5176: VDD = +3V, VREF = +1.25V; CL = 100pF, OS = AGND, code = FFF hex, TA = +25°C, unless otherwise noted.) MAX5174 300 290 280 270 260 250 288 240 286 284 282 280 278 276 274 272 1.4 MAX5174/6toc03 310 290 MAX5174/6toc02 320 NO-LOAD SUPPLY CURRENT (µA) MAX5174/6 toc01 330 NO-LOAD SUPPLY CURRENT (µA) SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE NO-LOAD SUPPLY CURRENT vs.
PAGE 7
Low-Power, Serial, 12-Bit DACs with Voltage Output MAX5174/MAX5176 Typical Operating Characteristics (continued) (MAX5174: VDD = +5V, VREF = 2.5V; MAX5176: VDD = +3V, VREF = +1.25V; CL = 100pF, OS = AGND, code = FFF hex, TA = +25°C, unless otherwise noted.) MAX5174 FFT PLOT DIGITAL FEEDTHROUGH MAJOR-CARRY TRANSITION MAX5174/6 toc12 VREF = 1.25VDC + 1.13Vp-p at f = 10kHz MAX5174/76 toc10 MAX5174/6 toc11 0 VOUT 2mV/div VCS V/div AC-COUPLED VOUT/VREF 12.
PAGE 8
Typical Operating Characteristics (continued) (MAX5174: VDD = +5V, VREF = 2.5V; MAX5176: VDD = +3V, VREF = +1.25V; CL = 100pF, OS = AGND, code = FFF hex, TA = +25°C, unless otherwise noted.) MAX5176 OUTPUT VOLTAGE vs. LOAD RESISTANCE OUTPUT VOLTAGE vs. TEMPERATURE 2.0486 2.0484 MAX5170/72 toc19 2.0 OUTPUT VOLTAGE (V) 2.0488 DYNAMIC RESPONSE MAX5174/6 toc20 2.5 MAX5174/6 toc18 2.0490 3V VCS 3V/div 0 1.5 2.048V 1.0 VOUT 500mV/div 0.5 2.0482 0 2.0480 10mV -0.
PAGE 9
Low-Power, Serial, 12-Bit DACs with Voltage Output MAX5176 REFERENCE INPUT FREQUENCY RESPONSE DIGITAL FEEDTHROUGH (SCLK, OUT) MAX5174/6 toc26 MAX5174/6toc27 0 SCLK 2V/div START-UP GLITCH MAX5174/6 toc28 5 VDD 1V/div GAIN (dB) -5 OUT 500µV/div -10 -15 VOUT 10mV/div -20 -25 VREF = 0.67Vp-p + 0.75VDC -30 2µs/div 0 500 1000 1500 2000 2500 3000 FREQUENCY (kHz) AC-COUPLED AC-COUPLED 50ms/div Pin Description PIN NAME FUNCTION 1 OS 2 OUT Offset Adjustment.
PAGE 10
MAX5174/MAX5176 Low-Power, Serial, 12-Bit DACs with Voltage Output Detailed Description The MAX5174/MAX5176 12-bit, serial, voltage-output DACs operate with a 3-wire serial interface. These devices include a 16-bit shift register and a doublebuffered input composed of an input register and a DAC register (see Functional Diagram). In addition, these devices employ a rail-to-rail output amplifier and internal trimmed resistors to provide a gain of +1.638V/V, maximizing the output voltage swing.
PAGE 11
Low-Power, Serial, 12-Bit DACs with Voltage Output SS DIN MAX5174 MAX5176 MOSI SCLK SCK CS SPI/QSPI PORT Specific commands for setting these are shown in Table 1. The general timing diagram in Figure 4 illustrates how the MAX5174/MAX5176 acquires data. CS must go low at least tCSS before the rising edge of the serial clock (SCLK). With CS low, data is clocked into the register on the rising edge of SCLK.
PAGE 12
MAX5174/MAX5176 Low-Power, Serial, 12-Bit DACs with Voltage Output CS COMMAND EXECUTED SCLK 1 DIN C2 8 C1 C0 D9 D8 D7 D6 9 D5 D4 16 D3 D2 D1 D0 S2 S1 S0 Figure 4. Serial-Interface Timing Diagram tCSW CS tCSO tCSS tCSH tCS1 SCLK tCH tCL tCP DIN tDS tD01 tD02 tDH DOUT Figure 5.
PAGE 13
Low-Power, Serial, 12-Bit DACs with Voltage Output OS +5V/+3V REF VDD VOFFSET = VOS · (1- Gain) MAX5174 MAX5176 where Gain = 1.638. DAC However, the total output voltage of the device cannot exceed VDD, regardless of the voltage on the OS pin. To set the gain of the output amplifier to 1, connect OS to OUT. OUT AGND DGND Daisy-Chaining Devices The serial-data output pin (DOUT) allows multiple MAX5174/MAX5176s to be daisy-chained together as shown in Figure 9.
PAGE 14
MAX5174/MAX5176 Low-Power, Serial, 12-Bit DACs with Voltage Output Using an AC Reference pins together and connecting that point to the system analog ground plane. This is useful because if the DAC’s DGND is connected to the system digital ground, digital noise may infiltrate the DAC’s analog portion. Bypass the power supply with a 4.7µF capacitor in parallel with a 0.1µF capacitor to AGND. Minimize capacitor lead lengths to reduce inductance.
PAGE 15
Low-Power, Serial, 12-Bit DACs with Voltage Output +5V/+3V R1 AC REFERENCE INPUT 500mVp-p TRANSISTOR COUNT: 3457 MAX495 R2 VDD REF OS OUT DAC AGND MAX5174 MAX5176 GND Figure 11.
PAGE 16
Low-Power, Serial, 12-Bit DACs with Voltage Output QSOP.EPS MAX5174/MAX5176 Package Information 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 circuitry and specifications without notice at any time.