Datasheet

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

General Description

The MAX5122/MAX5123 low-power, 12-bit, voltage-out-

put, digital-to-analog converters (DACs) feature an inter-

nal precision bandgap reference and output amplifier.

The MAX5122 operates on a single +5V supply with an

internal +2.5V reference, and offers a configurable output

amplifier. If necessary, the user can override the on-chip,

<10ppm/°C voltage reference with an external reference.

The MAX5123 has the same features as the MAX5122 but

operates from a single +3V supply and has an internal

+1.25V precision reference. The user-accessible inverting

input and output of the amplifier allows specific gain con-

figurations, remote sensing, and high output drive capa-

bility for a wide range of force/sense applications. Both

devices draw only 500µA of supply current, which

reduces to 3µA in power-down mode. In addition, their

power-up reset feature allows for a user-selectable initial

output state of either 0V or midscale and reduces output

glitches during power-up.

The serial interface is compatible with SPI™, QSPI™, and

MICROWIRE™, which makes the MAX5122/MAX5123

suitable for cascading multiple devices. Each DAC has

a double-buffered input organized as an input register

followed by a DAC register. A 16-bit shift register loads

data into the input register. The DAC register may be

updated independently or simultaneously with the input

Both devices are available in a 16-pin QSOP package

and are specified for the extended-industrial (-40°C to

+85°C) operating temperature range. For pin-compatible

14-bit upgrades, see the MAX5171/MAX5173 data sheet;

for the pin-compatible 13-bit version, see the MAX5132/

MAX5133 data sheet.

Applications

Industrial Process Control

Automatic Test Equipment

Digital Offset and Gain Adjustment

Motion Control

Microprocessor-Controlled Systems

Features

♦ Single-Supply Operation

+5V (MAX5122)

+3V (MAX5123)

♦ Built-In 10ppm/°C max Precision Bandgap Reference

+2.5V (MAX5122)

+1.25V (MAX5123)

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

Interface

♦ Pin-Programmable Shutdown Mode and Power-

Up Reset (0 or Midscale Output Voltage)

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

or 4–20mA Loads

♦ Space-Saving 16-Pin QSOP Package

♦ Pin-Compatible 13-Bit Upgrades Available

(MAX5132/MAX5133)

♦ Pin-Compatible 14-Bit Upgrades Available

(MAX5171/MAX5173)

MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs

with 10ppm/°C Internal Reference

________________________________________________________________ Maxim Integrated Products 1

FB V

REFADJ

REF

AGND

UPO

DOUT

DGND

TOP VIEW

MAX5122

MAX5123

QSOP

OUT

RSTVAL

PDL

CLR

DIN

SCLK

19-1446; Rev 2; 5/06

PART

MAX5122AEEE

MAX5122BEEE 16 QSOP

16 QSOP

PIN-

PACKAGE

INL

(LSB)

±0.5

±1

Pin Configuration

Ordering Information

PKG

CODE

E16-5

MAX5123AEEE

MAX5123BEEE

E16-5

16 QSOP

16 QSOP ±1

±2 E16-5

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

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.

Note: All devices are specified over the -40°C to +85°C oper-

ating temperature range.

Summary of content (19 pages)

PAGE 1
9-1446; Rev 2; 5/06 +5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference The MAX5122/MAX5123 low-power, 12-bit, voltage-output, digital-to-analog converters (DACs) feature an internal precision bandgap reference and output amplifier. The MAX5122 operates on a single +5V supply with an internal +2.5V reference, and offers a configurable output amplifier. If necessary, the user can override the on-chip, <10ppm/°C voltage reference with an external reference.
PAGE 2
MAX5122/MAX5123 +5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference 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 Digital Outputs (DOUT, UPO) to DGND .....-0.3V to (VDD + 0.3V) FB, OUT to AGND ......................................-0.3V to (VDD + 0.
PAGE 3
+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference (VDD = +5V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, RL = 5kΩ, CL = 100pF, output amplifier configured in unity-gain, 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 To ±0.5LSB, VSTEP = 2.5V Output Voltage Swing (Note 4) 0.
PAGE 4
MAX5122/MAX5123 +5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference ELECTRICAL CHARACTERISTICS—MAX5123 (+3V) (continued) (VDD = +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, RL = 5kΩ, CL = 100pF, output amplifier connected in unity-gain, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Input Leakage Current IIN Input Capacitance CIN CONDITIONS VIN = 0 or VDD MIN TYP MAX UNITS -1 0.
PAGE 5
+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference (VDD = +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference, RL = 5kΩ, CL = 100pF, output amplifier connected in unity-gain, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 6
Typical Operating Characteristics (VDD = +5V, RL = 5kΩ, CL = 100pF, output amplifier in unity-gain configuration, TA = +25°C, unless otherwise noted.) MAX5122 DIFFERENTIAL NONLINEARITY vs. DIGITAL INPUT CODE 0.10 DNL (LSB) 0.05 0.15 0 0 -0.05 -0.05 -0.10 -0.10 -0.15 -0.15 -0.20 1,000 2,000 3,000 4,000 2.500 2.495 0 1,000 2,000 3,000 4,000 -60 -40 5,000 -20 0 20 40 60 80 100 DIGITAL INPUT CODE DIGITAL INPUT CODE TEMPERATURE (°C) MAX5122 SUPPLY CURRENT vs.
PAGE 7
+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference MAX5122 MAJOR CARRY TRANSITION MAX5122 DIGITAL FEEDTHROUGH (SCLK, OUT) MAX5122 DYNAMIC RESPONSE FALL TIME MAX5122/23-11 MAX5122/23-10 SCLK 2V/div CS 5V/div OUT 1V/div 5µs/div MAX5123 DIFFERENTIAL NONLINEARITY vs. DIGITAL INPUT CODE 0.05 DNL (LSB) 0.10 0.05 0 0 -0.05 -0.10 -0.05 -0.10 -0.15 -0.15 -0.20 -0.25 -0.20 1,000 2,000 3,000 4,000 1.255 1.250 1.245 1.240 0 5,000 MAX5122/23 toc15 0.10 1.
PAGE 8
Typical Operating Characteristics (continued) (VDD = +5V, RL = 5kΩ, CL = 100pF, output amplifier in unity-gain configuration, TA = +25°C, unless otherwise noted.) MAX5123 FULL-SCALE OUTPUT VOLTAGE vs. TEMPERATURE MAX5123 FULL-SCALE OUTPUT ERROR vs. RESISTIVE LOAD 1.250 1.245 1.240 MAX5122/23-21 MAX5122/23 toc20 1.255 -1 CS 2V/div -2 OUT 400mV/div -3 -4 -60 -40 -20 0 20 40 60 80 100 0.01 0.
PAGE 9
+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference PIN NAME FUNCTION 1 FB 2 OUT Analog Output Voltage. High impedance if part is in shutdown. 3 RSTVAL Reset Value Input (Digital Input). 1: Connect to VDD to select midscale as the output reset value. 0: Connect to DGND to select 0V as the output reset value. 4 PDL Power-Down Lockout (Digital Input). 1: Normal operation. 0: Disallows shutdown (device cannot be powered down). 5 CLR Reset DAC Input (Digital Input).
PAGE 10
MAX5122/MAX5123 +5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference CS PDL PD VDD AGND DGND DIN SCLK SR CONTROL DOUT 16-BIT SHIFT REGISTER RSTVAL LOGIC OUTPUT UPO DECODE CONTROL CLR FB 12 MAX5122 MAX5123 BANDGAP 1.25V REFERENCE INPUT REGISTER 2X (X1) 4k DAC REGISTER OUT DAC 2.5V (1.25V) REFERENCE BUFFER REFADJ REF ( ) ARE FOR MAX5123 ONLY. Figure 1.
PAGE 11
+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference External Reference An external reference may be applied to the REF pin. Disable the internal reference by pulling REFADJ to VDD. This allows an external reference signal (AC- or DC-based) to be fed into the REF pin. For proper operation, do not exceed the input voltage range limits of 0 to (VDD - 1.4V) for VREF.
PAGE 12
MAX5122/MAX5123 +5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference Table 1. Serial-Interface Programming Commands 16-BIT SERIAL WORD S0* FUNCTION C2 C1 C0 D11 ............... D0 S0* 0 0 0 XXXXXXXXXXXX 0 No operation. 0 0 1 12-Bit DAC Data 0 Load input register; DAC register unchanged. 0 1 0 12-Bit DAC Data 0 Simultaneously load input and DAC registers; exit shutdown. 0 1 1 XXXXXXXXXXXX 0 Update DAC register from input register; exit shutdown.
PAGE 13
+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference MAX5122 and 6.6MHz for the MAX5123. Figure 7 depicts a more detailed timing diagram of the serial interface. • The state of the user-programmable logic output, • The configuration of the device after shutdown. The general timing diagram in Figure 6 illustrates how data is acquired. CS must be low for the part to receive data. With CS low, data at DIN is clocked into the register on the rising edge of SCLK.
PAGE 14
MAX5122/MAX5123 +5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference Table 3. Detailed SSPCON Register Contents CONTROL BIT MAX5122/MAX5123 SETTINGS SYNCHRONOUS SERIAL-PORT CONTROL REGISTER (SSPCON) WCOL BIT7 X Write Collision Detection Bit SSPOV BIT6 X Receive Overflow Detect Bit SSPEN BIT5 1 Synchronous Serial Port Enable Bit. 0: Disables serial port and configures these pins as I/O port pins. 1: Enables serial port and configures SCK, SDO and SCI as serialport pins.
PAGE 15
+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference Definitions Integral Nonlinearity (INL) Integral nonlinearity (Figure 8a) is the deviation of the values on an actual transfer function from a straight line. This straight line can be either a best-straight-line fit (closest approximation to the actual transfer curve) or a line drawn between the endpoints of the transfer function, once offset and gain errors have been nullified.
PAGE 16
MAX5122/MAX5123 +5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference Settling Time The settling time is the amount of time required from the start of a transition until the DAC output settles to its new output value within the converter’s specified accuracy. +5V/+3V REF VDD 50k MAX5122 MAX5123 Digital Feedthrough Digital feedthrough is noise generated on the DAC’s output when any digital input transitions.
PAGE 17
+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference MAX5122/MAX5123 Table 5. Unipolar Code Table (Figure 9) DAC CONTENTS ANALOG OUTPUT INTERNAL REFERENCE SUB-BIT S0 MAX5122 MAX5123 EXTERNAL REFERENCE MAX5122/MAX5123 1111 1111 1111 0 +4.99878V +2.49939V VREF (4095 / 4096) 2 1000 0000 0001 0 +2.50122V +1.25061V VREF (2049 / 4096) 2 1000 0000 0000 0 +2.5V +1.25V VREF (2048 / 4096) 2 0111 1111 1111 0 +2.49878V +1.
PAGE 18
MAX5122/MAX5123 +5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference V DD ). Bypass the power supply (VDD) with a 4.7µF capacitor in parallel with a 0.1µF capacitor to AGND. Minimize lead lengths to reduce lead inductance. Using an External Reference with AC Components The MAX5122/MAX5123 have multiplying capabilities within the reference input voltage range specifications.
PAGE 19
+5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference QSOP.EPS PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH 21-0055 F 1 1 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.