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19-1196; Rev 0; 2/97
Low-Power, 12-Bit Voltage-Output DACs with Serial Interface
__________________General Description
The MAX5352/MAX5353 combine a low-power, voltageoutput, 12-bit digital-to-analog converter (DAC) and a precision output amplifier in an 8-pin MAX or DIP package. The MAX5352 operates from a single +5V supply, and the MAX5353 operates from a single +3.3V supply. Both devices draw less than 280A of supply current. The output amplifier's inverting input is available to the user, allowing specific gain configurations, remote sensing, and high output current capability. This makes the MAX5352/MAX5353 ideal for a wide range of applications, including industrial process control. Other features include a software shutdown and power-on reset. The serial interface is compatible with SPITM/QSPITM and MicrowireTM. The DAC has a double-buffered input, organized as an input register followed by a DAC register. A 16-bit serial word loads data into the input register. The DAC register can be updated independently or simultaneously with the input register. All logic inputs are TTL/CMOS-logic compatible and buffered with Schmitt triggers to allow direct interfacing to optocouplers.
______________________________Features
o 12-Bit DAC with Configurable Output Amplifier o +5V Single-Supply Operation (MAX5352) +3.3V Single-Supply Operation (MAX5353) o Low Supply Current: 0.28mA Normal Operation 2A Shutdown Mode o Available in 8-Pin MAX o Power-On Reset Clears DAC Output to Zero o SPI/QSPI and Microwire Compatible o Schmitt-Trigger Digital Inputs for Direct Optocoupler Interface o +3.3V MAX5353 Directly Interfaces with +5V Logic
MAX5352/MAX5353
_________________Ordering Information
PART* MAX5352ACPA MAX5352BCPA MAX5352ACUA MAX5352BCUA TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C PIN-PACKAGE 8 Plastic DIP 8 Plastic DIP 8 MAX 8 MAX INL (LSB) 1/2 1 1/2 1
________________________Applications
Industrial Process Controls Automatic Test Equipment Digital Offset and Gain Adjustment Motion Control Remote Industrial Controls Microprocessor-Controlled Systems
Ordering Information continued at end of data sheet. *Contact factory for availability of 8-pin SO package.
____________________Functional Diagram
GND VDD REF FB OUT DAC
_______________________Pin Configuration
TOP VIEW
DAC REGISTER CONTROL INPUT REGISTER CS DIN SCLK
OUT 1 CS 2 DIN 3 SCLK 4
8
VDD GND REF FB
MAX5352 MAX5353
7 6 5
16-BIT SHIFT REGISTER
MAX5352 MAX5353
DIP/MAX
SPI and QSPI are registered trademarks of Motorola, Inc. Microwire is a registered trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Low-Power, 12-Bit Voltage-Output DACs with Serial Interface MAX5352/MAX5353
ABSOLUTE MAXIMUM RATINGS
VDD to GND .................................................................-0.3V, +6V REF, OUT, FB to GND ................................-0.3V to (VDD + 0.3V) Digital Inputs to GND ...............................................-0.3V to +6V Continuous Current into Any Pin.......................................20mA Continuous Power Dissipation (TA = +70C) Plastic DIP (derate 9.09mW/C above +70C) .................727mW MAX (derate 4.10mW/C above +70C) ......................330mW CERDIP (derate 8.00mW/C above +70C) ...................640mW Operating Temperature Ranges MAX5352_C_A/MAX5353_C_A.............................0C to +70C MAX5352_E_A/MAX5353_E_A ..........................-40C to +85C MAX5352BMJA/MAX5353BMJA .....................-55C to +125C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS: MAX5352
(VDD = +5V 10%, REF = 2.5V, GND = 0V, RL = 5k, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C. Output buffer connected in unity-gain configuration (Figure 8).) PARAMETER Resolution Integral Nonlinearity (Note 1) Differential Nonlinearity Offset Error Offset-Error Tempco Gain Error (Note 1) Gain-Error Tempco Power-Supply Rejection Ratio REFERENCE INPUT Reference Input Range Reference Input Resistance Reference -3dB Bandwidth Reference Feedthrough Signal-to-Noise Plus Distortion Ratio DIGITAL INPUTS Input High Voltage Input Low Voltage Input Leakage Current Input Capacitance VIH VIL IIN CIN VIN = 0V or VDD 0.001 8 2.4 0.8 0.5 V V A pF SINAD VREF RREF Code dependent, minimum at code 1554 hex VREF = 0.67Vp-p Input code = all 0s, VREF = 3.6Vp-p at 1kHz VREF = 1Vp-p at 25kHz, code = full scale 0 14 20 650 -84 77 VDD - 1.4 V k kHz dB dB PSRR 4.5V VDD 5.5V SYMBOL N MAX5352A INL DNL VOS TCVOS GE MAX5352B MAX5352BMJA Guaranteed monotonic 0.3 6 -0.3 1 600 3 CONDITIONS MIN 12 0.5 1.0 2.0 1.0 8 LSB mV ppm/C LSB ppm/C V/V LSB TYP MAX UNITS Bits STATIC PERFORMANCE--ANALOG SECTION
MULTIPLYING-MODE PERFORMANCE
2
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface
ELECTRICAL CHARACTERISTICS: MAX5352 (continued)
(VDD = +5V 10%, REF = 2.5V, GND = 0V, RL = 5k, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C. Output buffer connected in unity-gain configuration (Figure 8).) PARAMETER DYNAMIC PERFORMANCE DIGITAL INPUTS Voltage Output Slew Rate Output Settling Time Output Voltage Swing Current into FB Start-Up Time Digital Feedthrough POWER SUPPLIES Supply Voltage Supply Current Supply Current in Shutdown Reference Current in Shutdown TIMING CHARACTERISTICS (Figure 6) SCLK Clock Period SCLK Pulse Width High SCLK Pulse Width Low CS Fall to SCLK Rise Setup Time SCLK Rise to CS Rise Hold Time DIN Setup Time DIN Hold Time SCLK Rise to CS Fall Delay CS Rise to SCLK Rise Hold Time CS Pulse Width High tCP tCH tCL tCSS tCSH tDS tDH tCS0 tCS1 tCSW 100 40 40 40 0 40 0 40 40 100 ns ns ns ns ns ns ns ns ns ns VDD IDD (Note 3) (Note 3) 4.5 0.28 4 0.001 5.5 0.4 20 0.5 V mA A A CS = VDD, DIN = 100kHz SR To 1/2LSB, VSTEP = 2.5V Rail-to-rail (Note 2) 0.6 14 0 to VDD 0.001 20 5 0.1 V/s s V A s nV-s SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5352/MAX5353
Note 1: Guaranteed from code 11 to code 4095 in unity-gain configuration. Note 2: Accuracy is better than 1LSB for VOUT = 8mV to VDD - 100mV, guaranteed by a power-supply rejection test at the end points. Note 3: RL = , digital inputs at GND or VDD.
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface MAX5352/MAX5353
ELECTRICAL CHARACTERISTICS: MAX5353
(VDD = +3.15V to +3.6V, REF = 1.25V, GND = 0V, RL = 5k, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C. Output buffer connected in unity-gain configuration (Figure 8).) PARAMETER Resolution Integral Nonlinearity (Note 4) Differential Nonlinearity Offset Error Offset-Error Tempco Gain Error (Note 4) Gain-Error Tempco Power-Supply Rejection Ratio REFERENCE INPUT Reference Input Range Reference Input Resistance Reference -3dB Bandwidth Reference Feedthrough Signal-to-Noise Plus Distortion Ratio DIGITAL INPUTS Input High Voltage Input Low Voltage Input Leakage Current Input Capacitance DYNAMIC PERFORMANCE Voltage Output Slew Rate Output Settling Time Output Voltage Swing Current into FB Start-Up Time Digital Feedthrough POWER SUPPLIES Supply Voltage Supply Current Supply Current in Shutdown Reference Current in Shutdown VDD IDD (Note 6) (Note 6) 3.15 0.24 1.6 0.001 3.6 0.4 10 0.5 V mA A A CS = VDD, DIN = 100kHz SR To 1/2LSB, VSTEP = 1.25V Rail-to-rail (Note 5) 0.6 14 0 to VDD 0.001 20 5 0.1 V/s s V A s nV-s VIH VIL IIN CIN VIN = 0V or VDD 0.001 8 2.4 0.6 0.5 V V A pF SINAD VREF RREF Code dependent, minimum at code 1554 hex VREF = 0.67Vp-p Input code = all 0s, VREF = 1.9Vp-p at 1kHz VREF = 1Vp-p at 25kHz, code = full scale 0 14 20 650 -84 72 VDD - 1.4 V k kHz dB dB PSRR SYMBOL N MAX5353A INL DNL VOS TCVOS GE MAX5353B MAX5353BMJA Guaranteed monotonic 0.3 6 -0.3 1 600 3 CONDITIONS MIN 12 1 2 4 1.0 8 LSB mV ppm/C LSB ppm/C V/V LSB TYP MAX UNITS Bits
STATIC PERFORMANCE--ANALOG SECTION
MULTIPLYING-MODE PERFORMANCE (VDD = +3.3V)
4
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface
ELECTRICAL CHARACTERISTICS: MAX5353 (continued)
(VDD = +3.15V to +3.6V, REF = 1.25V, GND = 0V, RL = 5k, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C. Output buffer connected in unity-gain configuration (Figure 8).) PARAMETER SCLK Clock Period SCLK Pulse Width High SCLK Pulse Width Low CS Fall to SCLK Rise Setup Time SCLK Rise to CS Rise Hold Time DIN Setup Time DIN Hold Time SCLK Rise to CS Fall Delay CS Rise to SCLK Rise Hold Time CS Pulse Width High SYMBOL tCP tCH tCL tCSS tCSH tDS tDH tCS0 tCS1 tCSW CONDITIONS MIN 100 40 40 40 0 40 0 40 40 100 TYP MAX UNITS ns ns ns ns ns ns ns ns ns ns TIMING CHARACTERISTICS (Figure 6)
MAX5352/MAX5353
Note 4: Guaranteed from code 22 to code 4095 in unity-gain configuration. Note 5: Accuracy is better than 1LSB for VOUT = 8mV to VDD - 150mV, guaranteed by a power-supply rejection test at the end points. Note 6: RL = , digital inputs at GND or VDD.
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface MAX5352/MAX5353
__________________________________________Typical Operating Characteristics
(MAX5352 only, VDD = +5V, RL = 5k, CL = 100pF, TA = +25C, unless otherwise noted.)
MAX5352
INTEGRAL NONLINEARITY vs. REFERENCE VOLTAGE
MAX5352-01
REFERENCE VOLTAGE INPUT FREQUENCY RESPONSE
MAX5352-02
SUPPLY CURRENT vs. TEMPERATURE
380 360 SUPPLY CURRENT (A) 340 320 300 280 260 240 220 RL =
MAX5352-03
0.3 0.2 0.1 0 INL (LSB) -0.1 -0.2 -0.3 -0.4 -0.5 0.4 1.2 2.0 2.8 3.6 REFERENCE VOLTAGE (V)
0
400
-4 RELATIVE OUTPUT (dB)
-8
-12
-16
-20 4.4 0 500k 1M 1.5M 2M 2.5M 3M FREQUENCY (Hz)
200 -60
-20
20
60
100
140
TEMPERATURE (C)
POWER-DOWN SUPPLY CURRENT vs. TEMPERATURE
MAX5352-04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX5352-05
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
-55 -60 THD + NOISE (dB) -65 -70 -75 -80 -85 -90 VREF = 2.5VDC + 1Vp-p SINE CODE = FULL SCALE
MAX5352-06
10 POWER-DOWN SUPPLY CURRENT (A) 9 8
500 450 400 SUPPLY CURRENT (A) 350 300 250 200 150 100 50 0
-50
7 6 5 4 3 2 1 0 -60 -20 20 60 100 140
4.0
4.4
4.8
5.2
5.6
6.0
1
10 FREQUENCY (kHz)
100
TEMPERATURE (C)
SUPPLY VOLTAGE (V)
OUTPUT FFT PLOT
MAX5352-07
FULL-SCALE OUTPUT vs. LOAD
MAX5352-08
REFERENCE FEEDTHROUGH AT 1kHz
REFERENCE INPUT SIGNAL -20 SIGNAL AMPLITUDE (dB)
MAX5352-09a/09b
0
2.49980 2.49976 FULL-SCALE OUTPUT (V) 2.49972 2.49968 2.49964 2.49960 2.49956 0.1k
-20 SIGNAL AMPLITUDE (dB)
VREF = 3.6Vp-p CODE = FULL SCALE fIN = 1kHz
0
-40
-40
-60
-60 OUTPUT FEEDTHROUGH -80
-80
-100 0.5 1.6 2.7 3.8 4.9 6.0 FREQUENCY (kHz)
-100 1k 10k LOAD () 100k 1M 0.5 1.6 2.7 3.8 4.9 6.0 FREQUENCY (kHz)
6
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface
____________________________Typical Operating Characteristics (continued)
(MAX5352 only, VDD = +5V, RL = 5k, CL = 100pF, TA = +25C, unless otherwise noted.)
MAX5352/MAX5353
MAX5352 (continued)
MAJOR-CARRY TRANSITION
MAX5352-10
DIGITAL FEEDTHROUGH (fSCLK = 100kHz)
MAX5352-11
CS 5V/div
SCLK, 2V/div
OUT, AC COUPLED 100mV/div
OUT, AC COUPLED 10mV/div CODE = 2048 10s/div CS = 5V 2s/div
DYNAMIC RESPONSE
MAX5352-12
OUT 1V/div
GND
10s/div GAIN = 2, SWITCHING FROM CODE 0 TO 4020
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface MAX5352/MAX5353
____________________________Typical Operating Characteristics (continued)
(MAX5353 only, VDD = +3.3V, RL = 5k, CL = 100pF, TA = +25C, unless otherwise noted.)
MAX5353
INTEGRAL NONLINEARITY vs. REFERENCE VOLTAGE
MAX5353-13
REFERENCE VOLTAGE INPUT FREQUENCY RESPONSE
MAX5353-14
SUPPLY CURRENT vs. TEMPERATURE
RL = 340 SUPPLY CURRENT (mA) 320 300 280 260 240 220
MAX5353-15
0.3 0.2 0.1 0 INL (LSB) -0.1 -0.2 -0.3 -0.4 -0.5 0.4 0.8 1.2 1.6 2.0 REFERENCE VOLTAGE (V)
0
360
-4 RELATIVE OUTPUT (dB)
-8
-12
-16 200 -60
2.4
-20 100k
500k
1M
1.5M
2M
2.5M
-20
20
60
100
140
FREQUENCY (Hz)
TEMPERATURE (C)
POWER-DOWN SUPPLY CURRENT vs. TEMPERATURE
MAX5353-16
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX5353-17
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
VREF = 1VDC + 0.5Vp-p SINE CODE = FULL SCALE
MAX5353-18
5.0 POWER-DOWN SUPPLY CURRENT (mA) 4.5 4.0
450 400 SUPPLY CURRENT (mA) 350 300 250 200 150 100
-50 -55 THD + NOISE (dB) -60 -65 -70 -75 -80
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -60 -20 20 60 100 140
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
1
10 FREQUENCY (kHz)
100
TEMPERATURE (C)
SUPPLY VOLTAGE (V)
OUTPUT FFT PLOT
MAX5353-19
FULL-SCALE OUTPUT vs. LOAD
MAX5353-20
REFERENCE FEEDTHROUGH AT 1kHz
REFERENCE INPUT SIGNAL -20 SIGNAL AMPLITUDE (dB)
MAX5353-21
0 VREF = 1.9Vp-p CODE = FULL SCALE fIN = 1kHz
1.24990 1.24988 FULL-SCALE OUTPUT (V) 1.24986 1.24984 1.24982 1.24980 1.24978 0.1k
0
-20 SIGNAL AMPLITUDE (dB)
-40
-40
-60
-60 OUTPUT FEEDTHROUGH -80
-80
-100 0.5 1.6 2.7 3.8 4.9 6.0 FREQUENCY (kHz)
-100 1k 10k LOAD () 100k 1M 0.5 1.2 1.9 2.6 3.3 4.0 FREQUENCY (kHz)
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface
_____________________Pin Description
FB
MAX5352/MAX5353
PIN 1 2 3 4 5 6 7 8
NAME OUT CS DIN SCLK FB REF GND VDD
FUNCTION DAC Output Voltage Chip-Select Input. Active low.
2R 2R 2R 2R 2R MSB R R R OUT
Serial-Data Input Serial-Clock Input DAC Output Amplifier Feedback Reference Voltage Input
AGND REF
Ground Positive Power Supply
SHOWN FOR ALL 1s ON DAC
Figure 1. Simplified DAC Circuit Diagram
_______________Detailed Description
The MAX5352/MAX5353 contain a voltage-output digital-to-analog converter (DAC) that is easily addressed using a simple 3-wire serial interface. Each IC includes a 16-bit shift register, and has a double-buffered input composed of an input register and a DAC register (see Functional Diagram). In addition to the voltage output, the amplifier's negative input is available to the user. The DAC is an inverted R-2R ladder network that converts a digital input (12 data bits plus one sub-bit) into an equivalent analog output voltage in proportion to the applied reference voltage. Figure 1 shows a simplified circuit diagram of the DAC.
In shutdown mode, the MAX5352/MAX5353's REF input enters a high-impedance state with a typical input leakage current of 0.001A. The reference input capacitance is also code dependent and typically ranges from 15pF (with an input code of all 0s) to 50pF (at full scale). The MAX873 +2.5V reference is recommended for the MAX5352.
Output Amplifier
The MAX5352/MAX5353's DAC output is internally buffered by a precision amplifier with a typical slew rate of 0.6V/s. Access to the output amplifier's inverting input provides the user greater flexibility in output gain setting/signal conditioning (see the Applications Information section). With a full-scale transition at the MAX5352/MAX5353 output, the typical settling time to 1/2LSB is 14s when loaded with 5k in parallel with 100pF (loads less than 2k degrade performance). The amplifier's output dynamic responses and settling performances are shown in the Typical Operating Characteristics.
Reference Inputs
The reference input accepts positive DC and AC signals. The voltage at the reference input sets the fullscale output voltage for the DAC. The reference input voltage range is 0V to (VDD - 1.4V). The output voltage (VOUT) is represented by a digitally programmable voltage source, as expressed in the following equation: VOUT = (VREF x NB / 4096) x Gain where NB is the numeric value of the DAC's binary input code (0 to 4095), VREF is the reference voltage, and Gain is the externally set voltage gain. The impedance at the reference input is code dependent, ranging from a low value of 14k when the DAC has an input code of 1554 hex, to a high value exceeding several giga ohms (leakage currents) with an input code of 0000 hex. Because the input impedance at the reference pin is code dependent, load regulation of the reference source is important.
Shutdown Mode
The MAX5352/MAX5353 feature a software-programmable shutdown that reduces supply current to a typical value of 4A. Writing 111X XXXX XXXX XXXX as the inputcontrol word puts the device in shutdown mode (Table 1). In shutdown mode, the amplifier's output and the reference input enter a high-impedance state. The serial interface remains active. Data in the input registers is retained in shutdown, allowing the MAX5352/MAX5353
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface MAX5352/MAX5353
to recall the output state prior to entering shutdown. Exit shutdown mode by either recalling the previous configuration or by updating the DAC with new data. When powering up the device or bringing it out of shutdown, allow 20s for the output to stabilize.
SCLK
SK
Serial-Interface Configurations
The MAX5352/MAX5353's 3-wire serial interface is compatible with both MicrowireTM (Figure 2) and SPITM/QSPITM (Figure 3). The serial input word consists of three control bits followed by 12+1 data bits (MSB first), as shown in Figure 4. The 3-bit control code determines the MAX5352/MAX5353's response outlined in Table 1. The MAX5352/MAX5353's digital inputs are double buffered. Depending on the command issued through the serial interface, the input register can be loaded without affecting the DAC register, the DAC register can be loaded directly, or the DAC register can be updated from the input register (Table 1). The +3.3V MAX5353 can also directly interface with +5V logic.
MAX5352 MAX5353
DIN SO MICROWIRE PORT
CS
I/O
Figure 2. Connections for Microwire
+5V
Serial-Interface Description
The MAX5352/MAX5353 require 16 bits of serial data. Table 1 lists the serial-interface programming commands. For certain commands, the 12+1 data bits are "don't cares." Data is sent MSB first and can be sent in two 8-bit packets or one 16-bit word (CS must remain low until 16 bits are transferred). The serial data is composed of three control bits (C2, C1, C0), followed by the 12+1 data bits D11...D0, S0 (Figure 4). Set the sub-bit (S0) to zero. The 3-bit control code determines: * the register to be updated, * the configuration when exiting shutdown. Figure 5 shows the serial-interface timing requirements. The chip-select pin (CS) must be low to enable the DAC's serial interface. When CS is high, the interface control circuitry is disabled. CS must go low at least tCSS before the rising serial clock (SCLK) edge to properly clock in the first bit. When CS is low, data is clocked into the internal shift register via the serial-data input pin (DIN) on SCLK's rising edge. The maximum guaranteed clock frequency is 10MHz. Data is latched into the MAX5352/MAX5353 input/DAC register on CS's rising edge.
SS
DIN
MOSI SPI/QSPI PORT
MAX5352 MAX5353
SCLK
SCK
CS
I/O
CPOL = 0, CPHA = 0
Figure 3. Connections for SPI/QSPI
MSB ..................................................................................LSB 16 Bits of Serial Data Control Bits C2 C1 3 Control Bits C0 Data Bits MSB ................................LSB Sub-Bit D11 .....................................D0, S0 12+1 Data Bits
Figure 4. Serial-Data Format
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface MAX5352/MAX5353
Table 1. Serial-Interface Programming Commands
16-BIT SERIAL WORD C2 X X X 1 0 C1 0 0 1 1 1 C0 0 1 0 1 1 D11...............D0 MSB LSB 12 bits of data 12 bits of data XXXXXXXXXXXX XXXXXXXXXXXX XXXXXXXXXXXX S0 FUNCTION S0 0 0 X X X Load input register; DAC register immediately updated (also exit shutdown). Load input register; DAC register unchanged. Update DAC register from input register (also exit shutdown; recall previous state). Shutdown No operation (NOP)
"X" = Don't care
CS COMMAND EXECUTED 1 DIN C2 C1 C0 D11 D10 D9 D8 8 D7 D6 9 D5 D4 D3 D2 D1 D0 16 S0
SCLK
Figure 5. Serial-Interface Timing Diagram
CS tCSO SCLK tDS DIN tDH tCSS tCL tCH tCP tCSH tCS1
tCSW
Figure 6. Detailed Serial-Interface Timing Diagram
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface MAX5352/MAX5353
DIN SCLK CS1 CS2 CS3 TO OTHER SERIAL DEVICES
CS
CS
CS
MAX5352 MAX5353
SCLK DIN SCLK DIN
MAX5352 MAX5353
SCLK DIN
MAX5352 MAX5353
Figure 7. Multiple MAX5352/MAX5353s Sharing Common DIN and SCLK Lines
Figure 7 shows a method of connecting several MAX5352/MAX5353s. In this configuration, the clock and the data bus are common to all devices, and separate chip-select lines are used for each IC.
Table 2. Unipolar Code Table
DAC CONTENTS MSB LSB 1111 1111 1111 (0) ANALOG OUTPUT
4095 +VREF 4096 2049 +VREF 4096 + VREF 2048 +VREF = 4096 2 2047 +VREF 4096 1 +VREF 4096
__________Applications Information
Unipolar Output
For a unipolar output, the output voltage and the reference input have the same polarity. Figure 8 shows the MAX5352/MAX5353 unipolar output circuit, which is also the typical operating circuit. Table 2 lists the unipolar output codes. Figure 9 illustrates a rail-to-rail output. This circuit shows the MAX5352 with the output amplifier configured with a closed-loop gain of +2 to provide a 0V to 5V full-scale range when a 2.5V reference is used. When the MAX5353 is used with a 1.25V reference, this circuit provides a 0V to 2.5V full-scale range.
1000 0000 0001 (0)
1000 0000 0000 (0)
0111 1111 1111 (0)
0000 0000 0001 (0) 0000 0000 0000 (0) NOTE: ( ) are for sub-bit.
0V
Bipolar Output
The MAX5352/MAX5353 output can be configured for bipolar operation using Figure 10's circuit according to the following equation: VOUT = VREF [(2NB / 4096) - 1] where NB is the numeric value of the DAC's binary input code. Table 3 shows digital codes (offset binary) and the corresponding output voltage for Figure 10's circuit.
Using an AC Reference
In applications where the reference has AC-signal components, the MAX5352/MAX5353 have multiplying capability within the reference input range specifications. Figure 11 shows a technique for applying a sinewave signal to the reference input where the AC signal is offset before being applied to REF. The reference voltage must never be more negative than GND.
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface
Table 3. Bipolar Code Table
DAC CONTENTS MSB LSB 1 1 1 1 1 1 1 1 11 1 1 ( 0 ) ANALOG OUTPUT
2047 +VREF 2048 1 +VREF 2048
The MAX5352's total harmonic distortion plus noise (THD+N) is typically less than -77dB (full-scale code), and the MAX5353's THD+N is typically less than -72dB (full-scale code), given a 1Vp-p signal swing and input frequencies up to 25kHz. The typical -3dB frequency is 650kHz for both devices, as shown in the Typical Operating Characteristics graphs.
MAX5352/MAX5353
1 0 0 0 0 0 0 0 00 0 1 ( 0 ) 1 0 0 0 0 0 0 0 00 0 0 ( 0 ) 0 1 1 1 1 1 1 1 11 1 1 ( 0 )
Digitally Programmable Current Source
The circuit of Figure 12 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) x (NB/4096) where NB is the numeric value of the DAC's binary input code and R is the sense resistor shown in Figure 12.
0V
1 -VREF 2048 2047 -VREF 2048 2048 -VREF = - VREF 2048
0 0 0 0 0 0 0 0 00 0 1 ( 0 )
0 0 0 0 0 0 0 0 00 0 0 ( 0 ) NOTE: ( ) are for sub-bit.
MAX5352 MAX5353
REF
+5V/+3.3V
MAX5352 MAX5353
REF
+5V/+3.3V
VDD
FB
VDD
FB
10k 10k
DAC OUT GND
DAC
OUT GND
Figure 8. Unipolar Output Circuit
Figure 9. Unipolar Rail-to-Rail Output Circuit
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface MAX5352/MAX5353
+5V/ +3.3V R1 REF +5V/+3.3V VDD FB VOUT DAC OUT VDAC OUT R2 AC REFERENCE INPUT V+ 500mVp-p 10k REF VDD 26k +5V/+3.3V
MAX495
MAX5352 MAX5353
GND
R1 = R2 = 10k 0.1%
MAX5352 MAX5353 GND
Figure 10. Bipolar Output Circuit
Figure 11. AC Reference Input Circuit
Grounding and Layout Considerations
+5V/ +3.3V VDD REF VL IOUT OUT 2N3904
DAC
MAX5352 MAX5353
Digital or AC transient signals on GND can create noise at the analog output. Tie GND to the highest-quality ground available. Good printed circuit board ground layout minimizes crosstalk between the DAC output, reference input, and digital input. Reduce crosstalk by keeping analog lines away from digital lines. Wire-wrapped boards are not recommended.
FB GND
R
Figure 12. Digitally Programmable Current Source
Power-Supply Considerations
On power-up, the input and DAC registers are cleared (set to zero code). For rated MAX5352/MAX5353 performance, REF must be at least 1.4V below VDD. Bypass VDD with a 4.7F capacitor in parallel with a 0.1F capacitor to GND. Use short lead lengths and place the bypass capacitors as close to the supply pins as possible.
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface
_Ordering Information (continued)
PART* MAX5352AEPA MAX5352BEPA MAX5352AEUA MAX5352BEUA MAX5352BMJA MAX5353ACPA MAX5353BCPA MAX5353ACUA MAX5353BCUA MAX5353AEPA MAX5353BEPA MAX5353AEUA MAX5353BEUA MAX5353BMJA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -55C to +125C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -55C to +125C PIN-PACKAGE 8 Plastic DIP 8 Plastic DIP 8 MAX 8 MAX 8 CERDIP** 8 Plastic DIP 8 Plastic DIP 8 MAX 8 MAX 8 Plastic DIP 8 Plastic DIP 8 MAX 8 MAX 8 CERDIP** INL (LSB) 1/2 1 1/2 1 2 1 2 1 2 1 2 1 2 4
___________________Chip Information
TRANSISTOR COUNT: 1677
MAX5352/MAX5353
*Contact factory for availability of 8-pin SO package. **Contact factory for availability and processing to MIL-STD-883.
________________________________________________________Package Information
PDIPN.EPS
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Low-Power, 12-Bit Voltage-Output DACs with Serial Interface MAX5352/MAX5353
___________________________________________Package Information (continued)
8LUMAXD.EPS
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.
16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
CDIPS.EPS

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