Datasheet

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

General Description

The MAX5312 12-bit, serial-interface, digital-to-analog

converter (DAC) provides bipolar ±5V to ±10V outputs

from ±12V to ±15V power-supply voltages, or a unipo-

lar 5V to 10V output from a single 12V to 15V power-

supply voltage.

The MAX5312 features excellent linearity with both inte-

gral nonlinearity (INL) and differential nonlinearity (DNL)

guaranteed to ±1 LSB (max). The device also features

a fast 10µs to 0.5 LSB settling time, and a hardware-

shutdown feature that reduces current consumption to

3.5µA. The output goes to midscale at power-up in

bipolar mode (0V), and to zero scale at power-up in

unipolar mode (0V). A clear input (CLR) asynchronously

clears the DAC register and sets the output to 0V. The

output can be asynchronously updated with the load

DAC (LDAC) input.

The device features a 10MHz SPI™-/QSPI™-/

MICROWIRE™-compatible serial interface that oper-

ates with 3V or 5V logic. Additional features include a

serial-data output (DOUT) for daisy chaining and read-

back functions. The MAX5312 requires a 2V to 5.25V

external reference voltage and is available in a 16-pin

SSOP package that operates over the extended -40°C

to +85°C temperature range.

Applications

Motor Control

Industrial Process Controls

Industrial Automation

Automatic Test Equipment (ATE)

Analog I/O Boards

Data-Acquisition Systems

Features

♦ Unipolar or Bipolar Output-Voltage Ranges

Unipolar: 0 to (+2 x V

REF

) (Single or Dual

Supply)

Bipolar: (-2 x V

REF

) to (+2 x V

REF

) (Dual Supply)

♦ Guaranteed INL ≤ ±1 LSB (max)

♦ Guaranteed Monotonic: DNL ≤ ±1 LSB (max)

♦ 10µs Settling Time to 0.5 LSB

♦ Low 3.5µA Shutdown Current

♦ 10MHz SPI-/QSPI-/MICROWIRE-Compatible Serial

Interface

♦ Power-On Reset Sets DAC Output to 0V

♦ Schmitt Trigger Inputs for Direct

Optocoupler Interface

♦ Serial-Data Output Allows Daisy Chaining

of Devices

♦ Small 16-Pin SSOP

MAX5312

±10V, 12-Bit, Serial, Voltage-Output DAC

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3119; Rev 0; 12/03

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX5312EAE -40°C to +85°C 16 SSOP

SCLK

REF

AGND

SGND

OUT

TOP VIEW

MAX5312

SSOP

DIN

DOUT

DGND

SHDN

UNI/BIP

LDAC

CLR

Pin Configuration

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Summary of content (19 pages)

PAGE 1
9-3119; Rev 0; 12/03 KIT ATION EVALU E L B AVAILA ±10V, 12-Bit, Serial, Voltage-Output DAC Features The MAX5312 12-bit, serial-interface, digital-to-analog converter (DAC) provides bipolar ±5V to ±10V outputs from ±12V to ±15V power-supply voltages, or a unipolar 5V to 10V output from a single 12V to 15V powersupply voltage. The MAX5312 features excellent linearity with both integral nonlinearity (INL) and differential nonlinearity (DNL) guaranteed to ±1 LSB (max).
PAGE 2
MAX5312 ±10V, 12-Bit, Serial, Voltage-Output DAC ABSOLUTE MAXIMUM RATINGS REF to AGND............................................................-0.3V to +6V Maximum Current into REF...............................................±10mA Maximum Current into Any Pin Excluding REF.................±50mA Continuous Power Dissipation (TA = +70°C) 16-Pin SSOP (derate 7.1mW/°C above +70°C) ...........571mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ...................
PAGE 3
±10V, 12-Bit, Serial, Voltage-Output DAC (VDD = +15V ±5%, VSS = -15V ±5%, VCC = +5V ±10%, AGND = DGND = SGND = 0V, VREF = 5V, RLOAD = 2kΩ, CLOAD = 250pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS (SCLK, DIN, CS, SHDN, UNI/BIP, CLR, LDAC) Input-Voltage High VIH Input-Voltage Low VIL Input Capacitance C Input Current (Note 1) +2.7V ≤ VCC ≤ +3.6V 0.7 x VCC +4.5V ≤ VCC ≤ +5.5V 2.4 V +2.
PAGE 4
MAX5312 ±10V, 12-Bit, Serial, Voltage-Output DAC ELECTRICAL CHARACTERISTICS (SINGLE SUPPLY) (VDD = +15V ±5%, VSS = 0V, VCC = +5V ±10%, AGND = DGND = SGND = 0V, VREF = 5V, RLOAD = 10kΩ, CLOAD = 250pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
±10V, 12-Bit, Serial, Voltage-Output DAC (VDD = +15V ±5%, VSS = 0V, VCC = +5V ±10%, AGND = DGND = SGND = 0V, VREF = 5V, RLOAD = 10kΩ, CLOAD = 250pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN Tri-State Capacitance TYP MAX UNITS 10 pF 2.5 V/µs DYNAMIC PERFORMANCE Voltage-Output Slew Rate Output Settling Time To ±0.
PAGE 6
MAX5312 ±10V, 12-Bit, Serial, Voltage-Output DAC TIMING CHARACTERISTICS (VDD = +15V, VSS = -15V or 0V, VCC = +2.7V to +5.5V, AGND = DGND = SGND = 0, VREF = 5V, RLOAD = 2kΩ, CLOAD = 250pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 7
±10V, 12-Bit, Serial, Voltage-Output DAC INTEGRAL NONLINEARITY vs. REFERENCE VOLTAGE 0.4 0.3 0.5 MAX5312 toc02 0.50 MAX5312 toc01 0.5 DIFFERENTIAL NONLINEARITY vs. INPUT CODE 0.45 0.4 0.3 0.40 0.2 0.1 0 -0.1 0.35 DNL (LSB) INL (LSB) 0.30 0.25 -0.2 0.1 0 -0.1 -0.2 0.20 -0.3 -0.3 0.15 -0.4 -0.4 0.10 -0.5 0 1024 2048 2.0 4096 3072 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 1024 2048 4096 3072 INPUT CODE (DECIMAL) VREF (V) INPUT CODE (DECIMAL) DIFFERENTIAL NONLINEARITY vs.
PAGE 8
Typical Operating Characteristics (continued) (VDD = +15V, VSS = -15V for bipolar graphs, VSS = 0 for unipolar graphs, VCC = +5V, AGND = DGND = SGND = 0, VREF = +5.0V, output unloaded, TA = +25°C, all graphs apply to both unipolar and bipolar, unless otherwise noted.) 2.5 MAX5312 toc11 50 CS 5V/div BIPOLAR MIDSCALE VOLTAGE vs. TEMPERATURE UNIPOLAR ZERO-SCALE VOLTAGE vs. TEMPERATURE MAX5312 toc10 CODE = 014hex 49 VOUT (mV) VOUT (mV) VOUT 100mV/div 46 CODE = 800hex 2.
PAGE 9
±10V, 12-Bit, Serial, Voltage-Output DAC BIPOLAR NEGATIVE SUPPLY CURRENT vs. SUPPLY VOLTAGE -0.5 VSS = 0V 2.2 2.5 2.1 -1.0 -2.0 IDD (mA) 2.0 -1.5 IDD (mA) ISS (mA) MAX5312 toc20A VDD = 15V MAX5312 toc19 3.0 MAX5312 toc18 0 BIPOLAR POSITIVE SUPPLY CURRENT vs. TEMPERATURE UNIPOLAR SUPPLY CURRENT vs. TEMPERATURE 1.5 2.0 1.9 -2.5 1.0 -3.0 -4.0 -15.80 1.7 0 -14.78 -13.76 -12.74 -11.72 -10.
PAGE 10
Typical Operating Characteristics (continued) (VDD = +15V, VSS = -15V for bipolar graphs, VSS = 0 for unipolar graphs, VCC = +5V, AGND = DGND = SGND = 0, VREF = +5.0V, output unloaded, TA = +25°C, all graphs apply to both unipolar and bipolar, unless otherwise noted.) CODE = FFFhex 10.000 9.995 -9.975 9.990 VOUT (V) -9.980 -9.985 -9.990 9.985 9.980 9.975 -9.995 9.970 -10.000 9.
PAGE 11
±10V, 12-Bit, Serial, Voltage-Output DAC BIPOLAR STARTUP RESPONSE, CLOAD = 250pF BIPOLAR STARTUP RESPONSE, CLOAD = 10pF MAX5312 toc30B MAX5312 toc30A VDD 20V/div 20V/div VCC 5V/div VDD VCC 5V/div 10V/div 10V/div VSS VSS VOUT 2V/div VOUT 1V/div t = 10.0μs/div t = 10.
PAGE 12
±10V, 12-Bit, Serial, Voltage-Output DAC MAX5312 Pin Description 12 PIN NAME 1 SCLK Serial-Clock Input. Data is shifted from DIN into the internal register on the rising edge of SCLK. Data is clocked out at DOUT on the falling edge of SCLK. SCLK is active only while CS is low. 2 DIN Serial-Data Input. DIN is the data input port for the serial interface. Clock data in on the rising edge of SCLK. 3 CS 4 DOUT 5 DGND 6 VCC 7 SHDN 8 UNI/BIP 9 OUT FUNCTION Active-Low Chip-Select Input.
PAGE 13
±10V, 12-Bit, Serial, Voltage-Output DAC The MAX5312 12-bit DAC operates from either single or dual supplies. Dual ±12V to ±15V power supplies provide a bipolar ±5V to ±10V output, or a unipolar 0 to 10V output. Single 12V to 15V power supplies provide only a unipolar 0 to 10V output. The reference input accepts voltages from 2V to 5.25V. The DAC features INL and DNL less than ±1 LSB (max), a fast 10µs settling time, and a hardware-shutdown mode that reduces current consumption to 3.5µA (max).
PAGE 14
MAX5312 ±10V, 12-Bit, Serial, Voltage-Output DAC DAC Architecture Data in the shift register is transferred to the input register during the appropriate software command only. Data in the input register is transferred to the DAC register in one of two ways: using the software command, or through external logic control using the asynchronous load input (LDAC). Table 2 shows the software commands that transfer the data from the shift register to the input and/or DAC registers.
PAGE 15
±10V, 12-Bit, Serial, Voltage-Output DAC MAX5312 tCSW CS tCS0 tCSS tCP tCSH tCS1 SCLK tCH tDS DIN tCL tDH LSB MSB tCSE tCSD tDO1 DOUT tLDS tLD LDAC Figure 3. Serial-Interface Timing Diagram 2R R 2R R MAX5312 R SW2 2R 2R 2R 2R 2R SW1 OUT D0 1 0 D1 1 0 D10 1 0 D11 1 SW3 2R 0 REF 2R AGND SGND DAC REGISTER UNI/BIP CONTROL LOGIC Figure 4.
PAGE 16
MAX5312 ±10V, 12-Bit, Serial, Voltage-Output DAC External Reference and Transfer Functions Connect an external 2V to 5.25V reference to REF (the MAX6350 is recommended). Set the output voltage range with the reference and the input code by using the equations below.
PAGE 17
±10V, 12-Bit, Serial, Voltage-Output DAC 4 x VREF 4096 +2047 +2046 +2045 +2044 +1 0 -1 3 2 1 -2045 0 -2048 4 x VREF 2 x VREF 2049 2048 2047 ANALOG OUTPUT VOLTAGE (LSB) 1 LSB = 4095 4094 4093 4092 -2046 hex DIGITAL INPUT CODE (LSB) Figure 5. Unipolar Transfer Function FFC FFD FFE FFF 801 800 7FF 000 001 002 003 FFC FFD FFE FFF 801 800 7FF -2047 000 001 002 003 ANALOG OUTPUT VOLTAGE (LSB) 2 x VREF 4096 MAX5312 1 LSB = hex DIGITAL INPUT CODE (LSB) Figure 6.
PAGE 18
MAX5312 ±10V, 12-Bit, Serial, Voltage-Output DAC SCLK CS CS CS CS TO OTHER SERIAL DEVICES MAX5312 MAX5312 SCLK DIN MAX5312 SCLK DOUT DIN DIN SCLK DOUT DIN DOUT Figure 7.
PAGE 19
±10V, 12-Bit, Serial, Voltage-Output DAC SSOP.EPS 2 1 INCHES E H MILLIMETERS DIM MIN MAX MIN MAX A 0.068 0.078 1.73 1.99 A1 0.002 0.008 0.05 0.21 B 0.010 0.015 0.25 0.38 C D 0.20 0.09 0.004 0.008 SEE VARIATIONS E 0.205 e 0.212 0.0256 BSC 5.20 INCHES D D D D D 5.38 MILLIMETERS MIN MAX MIN MAX 0.239 0.239 0.278 0.249 0.249 0.289 6.07 6.07 7.07 6.33 6.33 7.33 0.317 0.397 0.328 0.407 8.07 10.07 8.33 10.33 N 14L 16L 20L 24L 28L 0.65 BSC H 0.301 0.311 7.