View MAX535_118902.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1124; Rev 1; 12/96
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface
__________________General Description
The MAX535/MAX5351 combine a low-power, voltageoutput, 13-bit digital-to-analog converter (DAC) and a precision output amplifier in an 8-pin MAX or DIP package. The MAX535 operates from a single +5V supply and the MAX5351 operates from a single +3.3V supply. Both devices draw only 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 MAX535/MAX5351 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 either SPITM/ QSPITM or 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 13-Bit DAC with Configurable Output Amplifier o +5V Single-Supply Operation (MAX535) +3.3V Single-Supply Operation (MAX5351) o Low Supply Current: 0.24mA Normal Operation 2A Shutdown Mode o Available in 8-Pin MAX o Power-On Reset Clears DAC Output to 0V o SPI/QSPI and Microwire Compatible o Schmitt-Trigger Digital Inputs for Direct Optocoupler Interface
MAX535/MAX5351
_________________Ordering Information
PART MAX535ACPA MAX535BCPA MAX535ACUA MAX535BCUA MAX535BC/D TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C PIN-PACKAGE 8 Plastic DIP 8 Plastic DIP 8 MAX 8 MAX Dice* INL (LSB) 1/2 1 1/2 1 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. *Dice are tested at TA = +25C, DC parameters only.
____________________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
MAX535 MAX5351
7 6 5
16-BIT SHIFT REGISTER
MAX535 MAX5351
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, 13-Bit Voltage-Output DACs with Serial Interface MAX535/MAX5351
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 6.90mW/C above +70C) .................552mW MAX (derate 4.00mW/C above +70C) ......................330mW CERDIP (derate 8.00mW/C above +70C) ...................640mW Operating Temperature Ranges MAX535_C_A/MAX5351_C_A...............................0C to +70C MAX535_E_A/MAX5351_E_A ............................-40C to +85C MAX535BMJA/MAX5351BMJA .......................-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: MAX535
(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 1555 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 MAX535A INL DNL VOS TCVOS GE MAX535B MAX535MJA Guaranteed monotonic 0.3 6 -0.5 1 600 6 CONDITIONS MIN 13 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
_______________________________________________________________________________________
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface
ELECTRICAL CHARACTERISTICS: MAX535 (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 Time to Valid Operation on Start-Up Digital Feedthrough POWER SUPPLIES Supply Voltage Supply Current Supply Current in Shutdown Reference Current in Shutdown TIMING CHARACTERISTICS 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 16 0 to VDD 0.001 20 5 0.1 V/s s V A s nV-s SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX535/MAX5351
Note 1: Guaranteed from code 22 to code 8191 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.
_______________________________________________________________________________________
3
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface MAX535/MAX5351
ELECTRICAL CHARACTERISTICS: MAX5351
(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 Time to Valid Operation on Start-Up 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 16 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 1555 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 MAX5351A INL DNL VOS TCVOS GE MAX5351B MAX5351MJA Guaranteed monotonic 0.3 6 -0.5 1 600 6 CONDITIONS MIN 13 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
_______________________________________________________________________________________
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface
ELECTRICAL CHARACTERISTICS: MAX5351 (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 TIMING CHARACTERISTICS 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 SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX535/MAX5351
Note 4: Guaranteed from code 44 to code 8191 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.
_______________________________________________________________________________________
5
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface MAX535/MAX5351
__________________________________________Typical Operating Characteristics
(MAX535 only, VDD = +5V, RL = 5k, CL = 100pF, TA = +25C, unless otherwise noted.)
MAX535
INTEGRAL NONLINEARITY vs. REFERENCE VOLTAGE
MAX535-01
REFERENCE VOLTAGE INPUT FREQUENCY RESPONSE
MAX535-02
SUPPLY CURRENT vs. TEMPERATURE
380 360 SUPPLY CURRENT (A) 340 320 300 280 260 240 220 RL =
MAX535-03
0.3 0.2 0.1 0 INL (LSB) -0.1 -0.2 -0.3 -0.4 -0.5
0
400
-4 RELATIVE OUTPUT (dB)
-8
-12
-16
-20 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 REFERENCE VOLTAGE (V) 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
MAX535-04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX535-05
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
MAX535-06
10 POWER-DOWN SUPPLY CURRENT (A) 9 8 7 6 5 4 3 2 1 0 -60 -20 20 60 100
500 450 SUPPLY CURRENT (A) 400 350 300 250 200 150 100 50 0
-50
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
MAX535-07
FULL-SCALE OUTPUT vs. LOAD
MAX535-08
REFERENCE FEEDTHROUGH AT 1kHz
REFERENCE INPUT SIGNAL SIGNAL AMPLITUDE (dB) -20
MAX535-09a/09b
0
FULL-SCALE OUTPUT (V)
SIGNAL AMPLITUDE (dB)
-20
VREF = 3.6Vp-p CODE = FULL SCALE fIN = 1kHz
2.500 2.499 2.498 2.497 2.496 2.495 2.494 2.493 2.492 2.491
0
-40
-40
-60
-60 OUTPUT FEEDTHROUGH -80
-80
-100 0.5
2.490 1.6 2.7 3.8 4.9 6.0 0.01k 0.1k 1k FREQUENCY (kHz) 10k 100k LOAD () 1M 10M
-100 0.5
1.6
2.7
3.8
4.9
6.0
FREQUENCY (kHz)
6
_______________________________________________________________________________________
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface
____________________________Typical Operating Characteristics (continued)
(MAX535 only, VDD = +5V, RL = 5k, CL = 100pF, TA = +25C, unless otherwise noted.)
MAX535/MAX5351
MAX535 (continued)
MAJOR-CARRY TRANSITION
MAX535-10
DIGITAL FEEDTHROUGH (fSCLK = 100kHz)
MAX535-11
CS 5V/div
SCLK, 2V/div
OUT, AC COUPLED 100mV/div
OUT, AC COUPLED 10mV/div CODE = 4096 10s/div CS = 5V 2s/div
DYNAMIC RESPONSE
MAX535-12
OUT 1V/div
GND
10s/div GAIN = 2, SWITCHING FROM CODE 0 TO 8040
_______________________________________________________________________________________
7
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface MAX535/MAX5351
____________________________Typical Operating Characteristics (continued)
(MAX5351 only, VDD = +3.3V, RL = 5k, CL = 100pF, TA = +25C, unless otherwise noted.)
MAX5351
INTEGRAL NONLINEARITY vs. REFERENCE VOLTAGE
MAX535-13
REFERENCE VOLTAGE INPUT FREQUENCY RESPONSE
MAX535-14
SUPPLY CURRENT vs. TEMPERATURE
RL = 340 SUPPLY CURRENT (A) 320 300 280 260 240 220
MAX535-15
0.6 0.4 0.2 0 INL (LSB) -0.2 -0.4 -0.6 -0.8 -1.0 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
MAX535-16
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX535-17
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
VREF = 1VDC + 0.5Vp-p SINE CODE = FULL SCALE
MAX535-18
5.0 POWER-DOWN SUPPLY CURRENT (A) 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -60 -20 20 60 100
450 400 SUPPLY CURRENT (A) 350 300 250 200 150 100
-50 -55 THD + NOISE (dB) -60 -65 -70 -75 -80
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
MAX535-19
FULL-SCALE OUTPUT vs. LOAD
MAX535-20
REFERENCE FEEDTHROUGH AT 1kHz
REFERENCE INPUT SIGNAL SIGNAL AMPLITUDE (dB) -20
MAX535-21
0 VREF = 1.9Vp-p CODE = FULL SCALE fIN = 1kHz
1.24932 1.24930 FULL-SCALE OUTPUT (V) 1.24928 1.24926 1.24924 1.24922 1.24920 1.24918 1.24916
0
SIGNAL AMPLITUDE (dB)
-20
-40
-40
-60
-60 OUTPUT FEEDTHROUGH -80
-80
-100 0.5
1.24914 1.6 2.7 3.8 4.9 6.0 100 1k 10k 100k 1M 10M FREQUENCY (kHz) LOAD ()
-100 0.5
1.2
1.9
2.6
3.3
4.0
FREQUENCY (kHz)
8
_______________________________________________________________________________________
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface
_____________________Pin Description
FB
MAX535/MAX5351
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 D0 2R D10 2R D11 2R D12 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 MAX535/MAX5351 contain a 13-bit, voltage-output digital-to-analog converter (DAC) that is easily addressed using a simple 3-wire serial interface. It includes a 16-bit shift register, and has a doubledbuffered 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 13-bit digital input into an equivalent analog output voltage in proportion to the applied reference voltage input. Figure 1 shows a simplified circuit diagram of the DAC.
code of 0000 hex. Because the input impedance at the reference pin is code dependent, load regulation of the reference source is important. The REF reference input has a 14k guaranteed minimum input impedance. A voltage reference with a load regulation of 6ppm/mA, such as the MAX873, would typically deviate by 0.0062LSB (0.009LSB worst case) when driving the MAX535 reference input at 2.5V. In shutdown mode, the MAX535/MAX5351'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 (with an input code of all 1s).
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: VOUT = (VREF x NB / 8192 ) x Gain where NB is the numeric value of the DAC's binary input code (0 to 8191), 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 1555 hex, to a high value exceeding several giga ohms (leakage currents) with an input
Output Amplifier
The MAX535/MAX5351'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 MAX535/MAX5351 output, the typical settling time to 1/2LSB is 16s when loaded with 5k in parallel with 100pF (loads less than 2k degrade performance). The MAX535 output amplifier's output dynamic responses and settling performances are shown in the Typical Operating Characteristics.
_______________________________________________________________________________________
9
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface MAX535/MAX5351
Shutdown Mode
The MAX535/MAX5351 feature a software-programmable shutdown that reduces supply current to a typical value of 4A. Writing 111XXXXXXXXXXXXX as the input-control word puts the MAX535/MAX5351 in shutdown mode (Table 1). In shutdown mode, the MAX535/MAX5351 output amplifier 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 MAX535/MAX5351 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
MAX535 MAX5351
DIN
SO
MICROWIRE PORT
CS
I/O
Serial-Interface Configurations
The MAX535/MAX5351'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 13 data bits (MSB first), as shown in Figure 4. The 3-bit control code determines the MAX535/MAX5351's response outlined in Table 1. The MAX535/MAX5351'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).
Figure 2. Connections for Microwire
+5V
SS
DIN
MOSI SPI/QSPI PORT
Serial-Interface Description
The MAX535/MAX5351 require 16 bits of serial data. Table 1 lists the serial-interface programming commands. For certain commands, the 13 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 13 data bits D12...D0 (Figure 4). 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 MAX535/MAX5351 input/DAC register on CS's rising edge.
10
MAX535 MAX5351
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 D12................................................D0 13 Data Bits
Figure 4. Serial-Data Format
______________________________________________________________________________________
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface MAX535/MAX5351
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 D12............................D0 MSB LSB 13 bits of data 13 bits of data XXXXXXXXXXXXX XXXXXXXXXXXXX XXXXXXXXXXXXX FUNCTION 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 D12 D11 D10 D9 8 D8 D7 9 D6 D5 D4 D3 D2 D1 16 D0
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
______________________________________________________________________________________ 11
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface MAX535/MAX5351
DIN SCLK CS1 CS2 CS3 TO OTHER SERIAL DEVICES
CS
CS
CS
MAX535 MAX5351
SCLK DIN SCLK DIN
MAX535 MAX5351
SCLK DIN
MAX535 MAX5351
Figure 7. Multiple MAX535/MAX5351s Sharing Common DIN and SCLK Lines
Figure 7 shows a method of connecting several MAX535/MAX5351s. 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 11111 1111 1111 ANALOG OUTPUT
8191 +VREF 8192 4097 +VREF 8192 4096 + VREF +VREF = 2 8192 4095 +VREF 8192 1 +VREF 8192
__________Applications Information
Unipolar Output
For a unipolar output, the output voltage and the reference input have the same polarity. Figure 8 shows the MAX535/MAX5351 unipolar output circuit, which is also the typical operating circuit. Table 2 lists the unipolar output codes. For rail-to-rail output, see Figure 9. This circuit shows the MAX535/MAX5351 with the output amplifier configured with a closed-loop gain of +2 to provide 0V to 5V full-scale range when a 2.5V reference is used. When using the MAX5351 with a 1.25V reference, this circuit provides a 0V to 2.5V full-scale range.
10000
0000
0001
10000
0000
0000
01111
1111
1111
00000 00000
0000 0000
0001 0000
0V
Bipolar Output
The MAX535/MAX5351 output can be configured for bipolar operation using Figure 10's circuit. VOUT = VREF [(2NB / 8192) - 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 MAX535/MAX5351 have multiplying capability within the reference input range specifications. Figure 11 shows a technique for applying a sine-wave 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.
12
______________________________________________________________________________________
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface
Table 3. Bipolar Code Table
DAC CONTENTS MSB LSB 11111 1111 1111 ANALOG OUTPUT
4095 +VREF 4096 1 +VREF 4096
The MAX535's total harmonic distortion plus noise (THD + N) is typically less than -77dB (full-scale code), and the MAX5351'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.
MAX535/MAX5351
10000 10000 01111
0000 0000 1111
0001 0000 1111
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. This circuit can be used to drive 4-20mA current loops, which are commonly used in industrialcontrol applications. The output current is calculated with the following equation: IOUT = (VREF / R) x (NB / 8192) 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 4096 4095 -VREF 4096 4096 -VREF = - VREF 4096
00000
0000
0001
00000
0000
0000
MAX535 MAX5351
REF
+5V/+3.3V VDD
MAX535 MAX5351
REF FB
+5V/+3.3V VDD 10k 10k
FB
DAC OUT GND
DAC
OUT GND
Figure 8. Unipolar Output Circuit
Figure 9. Unipolar Rail-to-Rail Output Circuit
______________________________________________________________________________________
13
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface MAX535/MAX5351
+5V/ +3.3V R1 REF +5V/+3.3V VDD FB VOUT DAC OUT VDAC OUT +V 500mVp-p 10k REF VDD R2 AC REFERENCE INPUT 26k +5V/+3.3V
MAX495
MAX535 MAX5351
GND
R1 = R2 = 10k 0.1%
MAX535 MAX5351 GND
Figure 10. Bipolar Output Circuit
Figure 11. AC Reference Input Circuit
Grounding and Layout Considerations
+5V/ +3.3V VDD REF VL DAC
MAX535 MAX5351
OUT
IOUT 2N3904
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 MAX535/MAX5351 performance, REF should 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.
14
______________________________________________________________________________________
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface
_Ordering Information (continued)
PART MAX535AEPA MAX535BEPA MAX535AEUA MAX535BEUA MAX535BMJA MAX5351ACPA MAX5351BCPA MAX5351ACUA MAX5351BCUA MAX5351BC/D MAX5351AEPA MAX5351BEPA MAX5351AEUA MAX5351BEUA MAX5351BMJA 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 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 8 Plastic DIP 8 Plastic DIP 8 MAX 8 MAX 8 CERDIP** 8 Plastic DIP 8 Plastic DIP 8 MAX 8 MAX Dice* 8 Plastic DIP 8 Plastic DIP INL (LSB) 1/2 1 1/2 1 2 1 2 1 2 2 1 2 1 2 4
___________________Chip Information
TRANSISTOR COUNT: 1677
MAX535/MAX5351
-40C to +85C 8 MAX -40C to +85C 8 MAX -55C to +125C 8 CERDIP**
Contact factory for availability.
* Dice are tested at +25C, DC parameters only. ** Contact factory for availability and processing to MIL-STD-883.
________________________________________________________Package Information
E D A3 A A2 E1
DIM A A1 A2 A3 B B1 C D1 E E1 e eA eB L INCHES MAX MIN 0.200 - - 0.015 0.175 0.125 0.080 0.055 0.022 0.016 0.065 0.045 0.012 0.008 0.080 0.005 0.325 0.300 0.310 0.240 - 0.100 - 0.300 0.400 - 0.150 0.115 INCHES MIN MAX 0.348 0.390 0.735 0.765 0.745 0.765 0.885 0.915 1.015 1.045 1.14 1.265 MILLIMETERS MIN MAX - 5.08 0.38 - 3.18 4.45 1.40 2.03 0.41 0.56 1.14 1.65 0.20 0.30 0.13 2.03 7.62 8.26 6.10 7.87 2.54 - 7.62 - - 10.16 2.92 3.81 MILLIMETERS MIN MAX 8.84 9.91 18.67 19.43 18.92 19.43 22.48 23.24 25.78 26.54 28.96 32.13
21-0043A
L A1 e B D1
0 - 15 C B1 eA eB
Plastic DIP PLASTIC DUAL-IN-LINE PACKAGE (0.300 in.)
PKG. DIM PINS P P P P P N D D D D D D 8 14 16 18 20 24
______________________________________________________________________________________
15
Low-Power, 13-Bit Voltage-Output DACs with Serial Interface MAX535/MAX5351
___________________________________________Package Information (continued)
DIM
C A 0.101mm 0.004 in B A1 L
e
A A1 B C D E e H L
INCHES MAX MIN 0.044 0.036 0.008 0.004 0.014 0.010 0.007 0.005 0.120 0.116 0.120 0.116 0.0256 0.198 0.188 0.026 0.016 6 0
MILLIMETERS MIN MAX 0.91 1.11 0.10 0.20 0.25 0.36 0.13 0.18 2.95 3.05 2.95 3.05 0.65 4.78 5.03 0.41 0.66 0 6
21-0036D
E
H
8-PIN MAX MICROMAX SMALL-OUTLINE PACKAGE
D
DIM
E1 A D E
Q L e B S1 S B1 L1
0-15 C
A B B1 C E E1 e L L1 Q S S1
INCHES MIN MAX - 0.200 0.014 0.023 0.038 0.065 0.008 0.015 0.220 0.310 0.290 0.320 0.100 0.125 0.200 0.150 - 0.015 0.070 - 0.098 0.005 -
MILLIMETERS MIN MAX - 5.08 0.36 0.58 0.97 1.65 0.20 0.38 5.59 7.87 7.37 8.13 2.54 3.18 5.08 3.81 - 0.38 1.78 - 2.49 0.13 -
CERDIP CERAMIC DUAL-IN-LINE PACKAGE (0.300 in.)
DIM PINS D D D D D D 8 14 16 18 20 24
INCHES MILLIMETERS MIN MAX MIN MAX - 0.405 - 10.29 - 0.785 - 19.94 - 0.840 - 21.34 - 0.960 - 24.38 - 1.060 - 26.92 - 1.280 - 32.51
21-0045A
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) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX535

	To Download MAX535 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .