Datasheet

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

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General Description

The MAX5175/MAX5177 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 MAX5175 operates from a single

+5V supply, and the MAX5177 operates from a single

+3V supply. The output amplifier’s inverting input is

available to allow specific gain configurations, remote

sensing, and high output current capability. This makes

the MAX5175/MAX5177 ideal for a wide range of appli-

cations, including industrial process control. Both

devices draw only 260µA of supply current, which

reduces to 1µA in shutdown mode. In addition, the pro-

grammable power-up reset feature allows for a user-

selectable output voltage state of either 0 or midscale.

The 3-wire serial interface is compatible with SPI™,

QSPI™, and MICROWIRE™ standards. An input register

followed by a DAC register provides a double-buffered

input, allowing the registers to be updated independent-

ly or simultaneously with a 16-bit serial word. Additional

features include software and hardware shutdown, shut-

down lockout, a hardware reset pin, and a reference

input capable of accepting DC and offset AC signals.

These devices provide a programmable digital output

pin for added functionality and a serial-data output pin

for daisy-chaining. All logic inputs are TTL/CMOS com-

patible and are internally buffered with Schmitt triggers

to allow direct interfacing to optocouplers.

The MAX5175/MAX5177 incorporate a proprietary on-chip

circuit that keeps the output voltage virtually “glitch free,”

limiting the glitches to a few millivolts during power-up.

Both devices come in 16-pin QSOP packages and are

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

range. The MAX5171/MAX5173 are 14-bit pin-compatible

upgrades to the MAX5175/MAX5177. For pin-compatible

DACs with an internal reference, see the 13-bit

MAX5132/MAX5133 and 12-bit MAX5122/MAX5123.

Applications

Digitally Programmable 4–20mA Current Loops

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 (MAX5175)

+3V (MAX5177)

♦ Full-Scale Output Range

+2.048V (MAX5177, V

REF

= +1.25V)

+4.096V (MAX5175, 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 (0 or midscale)

♦ Buffered Output Capable of Driving 4–20mA or

5kΩ || 100pF Loads

♦ User-Programmable Digital Output Pin Allows

Serial Control of External Components

♦ 14-Bit Upgrades Available (MAX5171/MAX5173)

MAX5175/MAX5177

Low-Power, Serial, 12-Bit DACs with

Force/Sense Voltage Output

________________________________________________________________

Maxim Integrated Products

FB V

N.C.

REF

AGND

SHDN

UPO

DOUT

DGND

TOP VIEW

MAX5175

MAX5177

QSOP

OUT

PDL

CLR

DIN

SCLK

19-1477; Rev 0; 4/99

PART

MAX5175AEEE

MAX5175BEEE

MAX5177AEEE

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

Functional Diagram appears at end of data sheet.

Pin Configuration

Ordering Information

MAX5177BEEE -40°C to +85°C 16 QSOP

INL

(LSB)

±1

±2

±4

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
9-1477; Rev 0; 4/99 Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output The MAX5175/MAX5177 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 MAX5175 operates from a single +5V supply, and the MAX5177 operates from a single +3V supply. The output amplifier’s inverting input is available to allow specific gain configurations, remote sensing, and high output current capability.
PAGE 2
MAX5175/MAX5177 Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output ABSOLUTE MAXIMUM RATINGS VDD to AGND, DGND ...............................................-0.3V to +6V AGND to DGND.....................................................-0.3V to +0.3V Digital Inputs to DGND.............................................-0.3V to +6V DOUT, UPO to DGND ................................-0.3V to (VDD + 0.3V) FB, OUT REF to AGND...............................-0.3V to (VDD + 0.
PAGE 3
Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output (VDD = +5V ±10%, VREF = 2.5V, AGND = DGND, FB = OUT, 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 ±0.5LSB, from 10mV to full-scale Output Voltage Swing (Note 3) 0 Current into FB -0.
PAGE 4
MAX5175/MAX5177 Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output ELECTRICAL CHARACTERISTICS—MAX5177 (VDD = +2.7V to +3.6V, VREF = 1.25V, AGND = DGND, FB = OUT, 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 Force/Sense Voltage Output (VDD = +2.7V to +3.6V, VREF = 1.25V, AGND = DGND, FB = OUT, 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 ±0.5LSB, from 10mV to full-scale Output Voltage Swing (Note 3) 0 Current into FB -0.
PAGE 6
Typical Operating Characteristics (MAX5175: VDD = +5V, VREF = 2.5V; MAX5177: VDD = +3V, VREF = 1.25V; CL = 100pF, FB = OUT, code = FFF hex, TA = +25°C, unless otherwise noted.) MAX5175 280 270 260 250 240 230 262 260 258 256 254 252 MAX5175-03 264 1.4 SHUTDOWN SUPPLY CURRENT (µA) 290 266 MAX5175-02 1.3 1.2 1.1 1.0 0.9 250 220 210 0.8 248 4.4 4.6 4.8 5.0 5.2 5.4 5.6 -50 -30 -10 OUTPUT VOLTAGE vs.
PAGE 7
Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output MAX5175 FFT PLOT MAJOR-CARRY TRANSITION DIGITAL FEEDTHROUGH VREF = 2.5 VDC + 1.414Vp-p at f = 10kHz VOUT/VREF (12.5dB/div) MAX5175 toc10 MAX5175-11 0 MAX5175-12 VCS (2V/div) VOUT (2mV/div) VOUT (100mV/div) V/SCLK (5V/div) 20 100k FREQUENCY (Hz) 400ns/div AC-COUPLED START-UP GLITCH REFERENCE INPUT FREQUENCY RESPONSE MAX5175-14 MAX5175-13 0 GAIN (dB) -5 VDD (1V/div) -10 -15 VOUT (10mV/div) -20 VREF = 0.67Vp-p + 1.
PAGE 8
Typical Operating Characteristics (continued) (MAX5175: VDD = +5V, VREF = 2.5V; MAX5177: VDD = +3V, VREF = 1.25V; CL = 100pF, FB = OUT, code = FFF hex, TA = +25°C, unless otherwise noted.) MAX5177 OUTPUT VOLTAGE vs. TEMPERATURE OUTPUT VOLTAGE vs. RESISTANCE LOAD MAX5175-19 1.2 OUTPUT VOLTAGE (V) 1.24970 1.24960 1.24950 DYNAMIC RESPONSE MAX5175-20 1.4 MAX5175-18 1.24980 OUTPUT VOLTAGE (V) 3V VCS (3V/div) 0 1.0 0.8 0.6 1.25V VOUT (500mV/div) 0.4 1.24940 0.2 1.
PAGE 9
Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output MAX5177 REFERENCE INPUT FREQUENCY RESPONSE START-UP GLITCH MAX5175-28 MAX5175-27 0 GAIN (dB) -5 VDD (1V/div) -10 -15 VOUT (10mV/div) AC-COUPLED -20 VREF = 0.67Vp-p + 1.25VDC -25 0 500 1000 1500 2000 2500 3000 50ms/div FREQUENCY (kHz) Pin Description PIN NAME FUNCTION 1 FB 2 OUT 3 RS Reset Mode Select (digital input). Connect to VDD to select midscale reset output value. Connect to DGND to select 0 reset output value.
PAGE 10
MAX5175/MAX5177 Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output Detailed Description FB The MAX5175/MAX5177 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, the negative terminal of the output amplifier is available.
PAGE 11
Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output • Clock edge on which serial data output (DOUT) is clocked out • State of the user-programmable logic output • Reset state. Specific commands for setting these are shown in Table 1. The general timing diagram in Figure 4 illustrates how the MAX5175/MAX5177 acquire 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
MAX5175/MAX5177 Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output CS COMMAND EXECUTED SCLK 1 DIN C2 8 C1 C0 D9 D8 D7 D6 D5 9 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 Force/Sense Voltage Output Unipolar Output Figure 6 shows the MAX5175/MAX5177 configured for unipolar, rail-to-rail operation with a gain of +2V/V. Table 2 lists the codes for unipolar output voltages. The output voltage is limited to VDD. Bipolar Output Figure 7 shows the MAX5175/MAX5177 configured for bipolar output operation.
PAGE 14
MAX5175/MAX5177 Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output SCLK SCLK MAX5175 MAX5177 DIN DOUT CS SCLK MAX5175 MAX5177 DIN DOUT CS MAX5175 MAX5177 DOUT DIN CS TO OTHER SERIAL DEVICES Figure 8. Daisy-Chaining MAX5175/MAX5177s DIN SCLK CS1 CS2 TO OTHER SERIAL DEVICES CS3 CS CS MAX5175 MAX5177 CS MAX5175 MAX5177 MAX5175 MAX5177 SCLK SCLK SCLK DIN DIN DIN Figure 9.
PAGE 15
Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output Digitally Programmable Current Source The circuit of Figure 11 places an NPN transistor (2N3904 or similar) within the op amp feedback loop to implement a digitally programmable, unidirectional current source. The output current is calculated with the following equation: IOUT = VREF R ⋅ ⋅ N 4096 power-supply source. Connect DGND and AGND pins together at the IC.
PAGE 16
Functional Diagram Chip Information TRANSISTOR COUNT: 3457 VDD AGND DGND CS DIN SCLK PDL SHDN RS CLR SERIAL CONTROL 16-BIT SHIFT REGISTER DECODE CONTROL INPUT REGISTER DAC REGISTER DOUT LOGIC OUTPUT MAX5175 MAX5177 UPO FB OUT DAC REF Package Information QSOP.EPS MAX5175/MAX5177 Low-Power, Serial, 12-Bit DACs with Force/Sense Voltage Output Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.