Rainbow Electronics MAX5353 User Manual

__________________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 µMAX 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 280µA 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 SPI™/QSPI™ and Microwire™. 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.

________________________Applications

Industrial Process Controls Automatic Test Equipment Digital Offset and Gain Adjustment Motion Control Remote Industrial Controls Microprocessor-Controlled Systems

______________________________Features

♦ 12-Bit DAC with Configurable Output Amplifier ♦ +5V Single-Supply Operation (MAX5352)

+3.3V Single-Supply Operation (MAX5353)

♦ Low Supply Current: 0.28mA Normal Operation

2µA Shutdown Mode

♦ Available in 8-Pin µMAX ♦ Power-On Reset Clears DAC Output to Zero ♦ SPI/QSPI and Microwire Compatible ♦ Schmitt-Trigger Digital Inputs for Direct

Optocoupler Interface

♦ +3.3V MAX5353 Directly Interfaces with +5V Logic

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs

with Serial Interface

________________________________________________________________

Maxim Integrated Products

MAX5352 MAX5353

OUT

DIN

SCLK

DAC

REF

DAC

INPUT

CONTROL

GND

16-BIT

SHIFT

____________________Functional Diagram

REF

DIN

SCLK

GND

OUT

MAX5352 MAX5353

DIP/µMAX

TOP VIEW

_______________________Pin Configuration

19-1196; Rev 0; 2/97

PART*

MAX5352ACPA

MAX5352BCPA 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 Plastic DIP 8 Plastic DIP

_________________Ordering Information

Ordering Information continued at end of data sheet.

Contact factory for availability of 8-pin SO package.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

INL

(LSB)

±1/2 ±1

SPI and QSPI are registered trademarks of Motorola, Inc. Microwire is a registered trademark of National Semiconductor Corp.

MAX5352ACUA MAX5352BCUA 0°C to +70°C

0°C to +70°C 8 µMAX

8 µMAX

±1/2 ±1

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs with Serial Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS: MAX5352

(VDD= +5V ±10%, REF = 2.5V, GND = 0V, RL= 5kΩ, CL= 100pF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

= +25°C. Output buffer connected in unity-gain configuration (Figure 8).)

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.

VDDto GND.................................................................-0.3V, +6V

REF, OUT, FB to GND................................-0.3V to (V

+ 0.3V)

Digital Inputs to GND ...............................................-0.3V to +6V

Continuous Current into Any Pin.......................................±20mA

Continuous Power Dissipation (T

= +70°C)

Plastic DIP (derate 9.09mW/°C above +70°C).................727mW

µMAX (derate 4.10mW/°C above +70°C) ......................330mW

CERDIP (derate 8.00mW/°C above +70°C)...................640mW

Operating Temperature Ranges

MAX5352_C_A/MAX5353_C_A.............................0°C to +70°C

MAX5352_E_A/MAX5353_E_A ..........................-40°C to +85°C

MAX5352BMJA/MAX5353BMJA .....................-55°C to +125°C

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10sec).............................+300°C

Code dependent, minimum at code 1554 hex

4.5V ≤ VDD≤ 5.5V

MAX5352BMJA

CONDITIONS

kΩ14 20R

REF

Reference Input Resistance

V0 V

- 1.4V

REF

Reference Input Range

µV/VPSRRPower-Supply Rejection Ratio 600

±0.5

Bits12NResolution

ppm/°C1Gain-Error Tempco

LSBGEGain Error (Note 1) -0.3 ±3

ppm/°C6TCV

Offset-Error Tempco

LSB±1.0INL

Integral Nonlinearity (Note 1)

±2.0

±0.3 ±8 mVV

Offset Error

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX5352A MAX5352B

Guaranteed monotonic LSB±1.0DNLDifferential Nonlinearity

REF

= 0.67Vp-p kHz650Reference -3dB Bandwidth

Input code = all 0s, V

REF

= 3.6Vp-p at 1kHz

REF

= 1Vp-p at 25kHz, code = full scale dB77SINAD

Signal-to-Noise Plus Distortion Ratio

dB-84Reference Feedthrough

V2.4V

Input High Voltage

VIN= 0V or V

pF8C

Input Capacitance

µA0.001 ±0.5I

Input Leakage Current

V0.8V

Input Low Voltage

STATIC PERFORMANCE—ANALOG SECTION

DIGITAL INPUTS

REFERENCE INPUT

MULTIPLYING-MODE PERFORMANCE

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs

with Serial Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS: MAX5352 (continued)

(VDD= +5V ±10%, REF = 2.5V, GND = 0V, RL= 5kΩ, CL= 100pF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

= +25°C. Output buffer connected in unity-gain configuration (Figure 8).)

(Note 3)

CS = VDD, DIN = 100kHz

Rail-to-rail (Note 2)

To ±1/2LSB, V

STEP

= 2.5V

CONDITIONS

mA0.28 0.4I

Supply Current

V4.5 5.5V

Supply Voltage

nV-s5Digital Feedthrough

µs20Start-Up Time

µA0.001 ±0.1Current into FB

V0 to V

Output Voltage Swing

µs14Output Settling Time

V/µs0.6SRVoltage Output Slew Rate

UNITSMIN TYP MAXSYMBOLPARAMETER

(Note 3) µA4 20Supply Current in Shutdown

µA0.001 ±0.5Reference Current in Shutdown

ns40t

SCLK Pulse Width High

ns100t

SCLK Clock Period

ns40t

CSS

CS Fall to SCLK Rise Setup Time

ns40t

DIN Setup Time

ns0t

CSH

SCLK Rise to CS Rise Hold Time

ns40t

SCLK Pulse Width Low

ns40t

CS1

CS Rise to SCLK Rise Hold Time

ns100t

CSW

CS Pulse Width High

ns40t

CS0

SCLK Rise to CS Fall Delay

ns0t

DIN Hold Time

Note 1: Guaranteed from code 11 to code 4095 in unity-gain configuration. Note 2: Accuracy is better than 1LSB for V

OUT

= 8mV to VDD- 100mV, guaranteed by a power-supply rejection test at the

end points.

Note 3: R

= ∞, digital inputs at GND or VDD.

DIGITAL INPUTSDYNAMIC PERFORMANCE

POWER SUPPLIES

TIMING CHARACTERISTICS (Figure 6)

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs with Serial Interface

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS: MAX5353

(VDD= +3.15V to +3.6V, REF = 1.25V, GND = 0V, RL= 5kΩ, CL= 100pF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at T

= +25°C. Output buffer connected in unity-gain configuration (Figure 8).)

Guaranteed monotonic LSB

Code dependent, minimum at code 1554 hex

±1.0

REF

= 0.67Vp-p

DNL

kHz

Differential Nonlinearity

650

MAX5353BMJA

Reference -3dB Bandwidth

CONDITIONS

Input code = all 0s, V

REF

= 1.9Vp-p at 1kHz

REF

= 1Vp-p at 25kHz, code = full scale dB72

kΩ14 20R

REF

Reference Input Resistance

V0 V

- 1.4V

REF

Reference Input Range

SINAD

Signal-to-Noise Plus Distortion Ratio

dB-84Reference Feedthrough

V2.4V

Input High Voltage

µV/VPSRRPower-Supply Rejection Ratio 600

VIN= 0V or V

±1MAX5353A

MAX5353B

Bits12NResolution

ppm/°C1Gain-Error Tempco

LSBGEGain Error (Note 4) -0.3 ±3

ppm/°C6TCV

Offset-Error Tempco

LSB±2INL

Integral Nonlinearity (Note 4)

±4

Input Capacitance

µA

±0.3 ±8

0.001 ±0.5I

Input Leakage Current

Offset Error

UNITSMIN TYP MAXSYMBOLPARAMETER

V0.6V

Input Low Voltage

To ±1/2LSB, V

STEP

= 1.25V

Rail-to-rail (Note 5) V0 to V

Output Voltage Swing

µs14Output Settling Time

V/µs0.6SRVoltage Output Slew Rate

µA0.001 ±0.1Current into FB

CS = VDD, DIN = 100kHz

V3.15 3.6V

Supply Voltage

nV-s5Digital Feedthrough

(Note 6)

µA0.001 ±0.5Reference Current in Shutdown

µA1.6 10Supply Current in Shutdown

mA0.24 0.4I

Supply Current

µs20Start-Up Time

STATIC PERFORMANCE—ANALOG SECTION

DIGITAL INPUTS

REFERENCE INPUT

MULTIPLYING-MODE PERFORMANCE (VDD= +3.3V)

DYNAMIC PERFORMANCE

POWER SUPPLIES

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs

with Serial Interface

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS: MAX5353 (continued)

(VDD= +3.15V to +3.6V, REF = 1.25V, GND = 0V, RL= 5kΩ, CL= 100pF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values

are at T

= +25°C. Output buffer connected in unity-gain configuration (Figure 8).)

CONDITIONS

40t

SCLK Pulse Width High

ns100t

SCLK Clock Period

ns40t

CSS

CS Fall to SCLK Rise Setup Time

ns40t

DIN Setup Time

ns0t

CSH

SCLK Rise to CS Rise Hold Time

ns40t

SCLK Pulse Width Low

UNITSMIN TYP MAXSYMBOLPARAMETER

ns40t

CS1

CS Rise to SCLK Rise Hold Time

ns0t

DIN Hold Time

ns100t

CSW

CS Pulse Width High

ns40t

CS0

SCLK Rise to CS Fall Delay

Note 4: Guaranteed from code 22 to code 4095 in unity-gain configuration. Note 5: Accuracy is better than 1LSB for V

OUT

= 8mV to VDD- 150mV, guaranteed by a power-supply rejection test at the

end points.

Note 6: R

= ∞, digital inputs at GND or VDD.

TIMING CHARACTERISTICS (Figure 6)

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs with Serial Interface

6 _______________________________________________________________________________________

9 8 7 6 5 4 3 2 1 0

-60 -20 20 60 100 140

MAX5352-04

POWER-DOWN SUPPLY CURRENT (µA)

POWER-DOWN SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

-100

0.5 1.6 3.8

OUTPUT FFT PLOT

-60

MAX5352-07

FREQUENCY (kHz)

SIGNAL AMPLITUDE (dB)

2.7 4.9 6.0

-20

-40

-80

REF

= 3.6Vp-p CODE = FULL SCALE f

= 1kHz

4.0 4.4 4.8 6.05.2 5.6

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX5352-05

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

400 350

500 450

300 250

150 100

200

-50

-90 1

100

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

-85

MAX5352-06

FREQUENCY (kHz)

THD + NOISE (dB)

-70

-60

-55

-80

-75

-65

REF

= 2.5VDC + 1Vp-p SINE

CODE = FULL SCALE

2.49956

2.49960

2.49964

2.49968

2.49972

2.49976

2.49980

0.1k 1k 10k 1M100k

FULL-SCALE OUTPUT vs. LOAD

MAX5352-08

LOAD (Ω)

FULL-SCALE OUTPUT (V)

-100

0.5 1.6 3.8

REFERENCE FEEDTHROUGH

AT 1kHz

-60

MAX5352-09a/09b

FREQUENCY (kHz)

SIGNAL AMPLITUDE (dB)

2.7 4.9 6.0

-20

-40

-80

OUTPUT FEEDTHROUGH

REFERENCE INPUT SIGNAL

__________________________________________Typical Operating Characteristics

(MAX5352 only, VDD= +5V, RL= 5kΩ, CL= 100pF, TA = +25°C, unless otherwise noted.)

INL (LSB)

-0.5

0.4 1.2 2.0 2.8 3.6 REFERENCE VOLTAGE (V)

MAX5352-01

4.4

0.3

0.2

0.1 0

-0.1

-0.2

-0.3

-0.4

INTEGRAL NONLINEARITY

vs. REFERENCE VOLTAGE

-4

-8

-12

-16

-20

500k0

1M 1.5M

2M 2.5M 3M

MAX5352-02

RELATIVE OUTPUT (dB)

REFERENCE VOLTAGE INPUT

FREQUENCY RESPONSE

FREQUENCY (Hz)

400 380 360 340 320 300 280 260 240 220 200

-60 -20 20 60 100 140

MAX5352-03

SUPPLY CURRENT (µA)

SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

RL = ∞

MAX5352

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs

with Serial Interface

_______________________________________________________________________________________

2µs/div

OUT,

AC COUPLED

10mV/div

CODE = 2048

DIGITAL FEEDTHROUGH (f

SCLK

= 100kHz)

MAX5352-11

SCLK,

2V/div

CS = 5V

____________________________Typical Operating Characteristics (continued)

(MAX5352 only, VDD= +5V, RL= 5kΩ, CL= 100pF, TA = +25°C, unless otherwise noted.)

10µs/div

MAJOR-CARRY TRANSITION

MAX5352-10

OUT,

AC COUPLED

100mV/div

5V/div

10µs/div

DYNAMIC RESPONSE

MAX5352-12

OUT

1V/div

GND

GAIN = 2, SWITCHING FROM CODE 0 TO 4020

MAX5352 (continued)

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs with Serial Interface

8 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(MAX5353 only, VDD= +3.3V, RL= 5kΩ, CL= 100pF, TA = +25°C, unless otherwise noted.)

INL (LSB)

-0.5

0.4 0.8 1.2 1.6 2.0 REFERENCE VOLTAGE (V)

MAX5353-13

2.4

0.3

0.2

0.1 0

-0.1

-0.2

-0.3

-0.4

INTEGRAL NONLINEARITY

vs. REFERENCE VOLTAGE

-4

-8

-12

-16

-20 100k

500k 1M 1.5M

2M 2.5M

MAX5353-14

RELATIVE OUTPUT (dB)

REFERENCE VOLTAGE INPUT

FREQUENCY RESPONSE

FREQUENCY (Hz)

360 340 320 300 280 260 240 220

200

-60 -20 20 60 100 140

MAX5353-15

SUPPLY CURRENT (mA)

SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

RL = ∞

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5 0

-60 -20 20 60 100 140

MAX5353-16

POWER-DOWN SUPPLY CURRENT (mA)

POWER-DOWN SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

-100

0.5 1.6 3.8

OUTPUT FFT PLOT

-60

MAX5353-19

FREQUENCY (kHz)

SIGNAL AMPLITUDE (dB)

2.7 4.9 6.0

-20

-40

-80

REF

= 1.9Vp-p CODE = FULL SCALE f

= 1kHz

3.0 3.1 3.2 3.3 3.4 3.83.5 3.6

3.7

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX5353-17

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

350

450

400

300

200

250

150 100

-50

-80 1

100

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

-75

MAX5353-18

FREQUENCY (kHz)

THD + NOISE (dB)

-65

-55

-70

-60

REF

= 1VDC + 0.5Vp-p SINE

CODE = FULL SCALE

FULL-SCALE OUTPUT vs. LOAD

MAX5353-20

LOAD (Ω)

1.24978

1.24980

1.24982

1.24984

1.24986

1.24988

1.24990

0.1k 1k 10k 1M100k

FULL-SCALE OUTPUT (V)

-100

0.5 1.2 2.6

REFERENCE FEEDTHROUGH

AT 1kHz

-60

MAX5353-21

FREQUENCY (kHz)

SIGNAL AMPLITUDE (dB)

1.9 3.3 4.0

-20

-40

-80

OUTPUT FEEDTHROUGH

REFERENCE INPUT SIGNAL

MAX5353

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs

with Serial Interface

_______________________________________________________________________________________ 9

_______________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 con-

verts 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.

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 (V

OUT

) is represented by a digitally programmable volt-

age source, as expressed in the following equation:

OUT

= (V

REF

x NB / 4096) x Gain

where NB is the numeric value of the DAC’s binary input code (0 to 4095), V

REF

is the reference voltage,

and Gain is the externally set voltage gain. The impedance at the reference input is code depen-

dent, ranging from a low value of 14kΩ 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.

In shutdown mode, the MAX5352/MAX5353’s REF input enters a high-impedance state with a typical input leakage current of 0.001µA.

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/µs. 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 14µs when loaded with 5kΩ in parallel with 100pF (loads less than 2kΩ degrade performance).

The amplifier’s output dynamic responses and settling performances are shown in the

Typical Operating

Characteristics

Shutdown Mode

The MAX5352/MAX5353 feature a software-programmable shutdown that reduces supply current to a typical value of 4µA. 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

OUT

SHOWN FOR ALL 1s ON DAC

MSB

2R 2R 2R 2R

R R R

REF

AGND

Figure 1. Simplified DAC Circuit Diagram

_____________________Pin Description

NAME FUNCTION

1 OUT DAC Output Voltage 2

Chip-Select Input. Active low.

3 DIN Serial-Data Input 4 SCLK Serial-Clock Input

8 V

Positive Power Supply

7 GND Ground

6 REF Reference Voltage Input

5 FB DAC Output Amplifier Feedback

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs with Serial Interface

10 ______________________________________________________________________________________

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 20µs for the output to stabilize.

Serial-Interface Configurations

The MAX5352/MAX5353’s 3-wire serial interface is compatible with both Microwire™ (Figure 2) and SPI™/QSPI™ (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.

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 t

CSS

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.

SCLK

DIN

I/O

MAX5352 MAX5353

MICROWIRE

PORT

Figure 2. Connections for Microwire

DIN

SCLK

MOSI

SCK

I/O

SPI/QSPI

PORT

+5V

CPOL = 0, CPHA = 0

MAX5352 MAX5353

Figure 3. Connections for SPI/QSPI

Figure 4. Serial-Data Format

3 Control

Bits

12+1 Data Bits

D11.....................................D0, S0C2 C1 C0

Data Bits

MSB................................LSB Sub-Bit

Control

Bits

16 Bits of Serial Data

MSB..................................................................................LSB

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs

with Serial Interface

______________________________________________________________________________________ 11

SCLK

DIN

COMMAND

EXECUTED

C2 S0

D11

D10

D8 D5 D4 D3 D2 D1 D0D7 D6

Figure 5. Serial-Interface Timing Diagram

Figure 6. Detailed Serial-Interface Timing Diagram

Table 1. Serial-Interface Programming Commands

“X” = Don’t care

SCLK

DIN

CSO

CSS

CSW

CS1

CSH

16-BIT SERIAL WORD

0 1 1

X 0 0 X 0 1

X 1 0 1 1 1

No operation (NOP)

Load input register; DAC register immediately updated (also exit shutdown).

D11...............D0

MSB LSB

FUNCTION

Load input register; DAC register unchanged.

C2 C1 C0

Update DAC register from input register (also exit shutdown; recall previous state).

Shutdown

XXXXXXXXXXXX

12 bits of data

12 bits of data XXXXXXXXXXXX XXXXXXXXXXXX

0 0

X X

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs with Serial Interface

12 ______________________________________________________________________________________

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.

__________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.

Bipolar Output

The MAX5352/MAX5353 output can be configured for bipolar operation using Figure 10’s circuit according to the following equation:

OUT

= V

REF

[(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.

NOTE: ( ) are for sub-bit.

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.

TO OTHER SERIAL DEVICES

MAX5352 MAX5353

DIN

SCLK

MAX5352 MAX5353

DIN

SCLK

MAX5352 MAX5353

DIN

SCLK

DIN

SCLK

CS1 CS2

CS3

Figure 7. Multiple MAX5352/MAX5353s Sharing Common DIN and SCLK Lines

Table 2. Unipolar Code Table

ANALOG OUTPUT

1111 1111 1111 (0)

1000 0000 0001 (0)

DAC CONTENTS

MSB LSB

1000 0000 0000 (0)

0111 1111 1111 (0)

0000 0000 0000 (0) 0V

0000 0000 0001 (0)

REF

2048





REF



4096

REF

4095

 



4096 2049

 



4096

 



2047

 



4096

 



4096

 

 





REF

 



 



MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs

with Serial Interface

______________________________________________________________________________________ 13

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.

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:

OUT

= (V

REF

/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.

MAX5352 MAX5353

DAC

REF

OUT

GND

+5V/+3.3V

Figure 8. Unipolar Output Circuit

Table 3. Bipolar Code Table

MAX5352 MAX5353

DAC

REF

OUT

10k

GND

+5V/+3.3V

Figure 9. Unipolar Rail-to-Rail Output Circuit

ANALOG OUTPUT

1111 1111 1111 (0)

1000 0000 0001 (0)

DAC CONTENTS

MSB LSB

1000 0000 0000 (0) 0V

0111 1111 1111 (0)

0000 0000 0000 (0)

0000 0000 0001 (0)

NOTE: ( ) are for sub-bit.

-V

2047

 



2048

 



 

 





 



2048

2048 2047

2048

-V

 



 



 

 





REF

-V

REF

-V

REF

2048

 

REF REF



2048

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs with Serial Interface

14 ______________________________________________________________________________________

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 VDDwith a 4.7µF capacitor in parallel with a 0.1µF capacitor to GND. Use short lead lengths and place the bypass capacitors as close to the supply pins as possible.

Grounding and Layout Considerations

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.

DAC

OUT

V+

+5V/+3.3V

V-

R1 = R2 = 10kΩ ±0.1%

MAX5352 MAX5353

REF

OUT

GND

Figure 10. Bipolar Output Circuit

DAC

OUT

MAX5352 MAX5353

10k

26k

REF

GND

+5V/

+3.3V

REFERENCE

INPUT

500mVp-p

MAX495

+5V/+3.3V

Figure 11. AC Reference Input Circuit

DAC

MAX5352 MAX5353

REF

OUT

2N3904

+5V/

+3.3V

GND

Figure 12. Digitally Programmable Current Source

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs

with Serial Interface

______________________________________________________________________________________ 15

_Ordering Information (continued)

Contact factory for availability of 8-pin SO package.

Contact factory for availability and processing to MIL-STD-883.

___________________Chip Information

TRANSISTOR COUNT: 1677

MAX5353AEPA -40°C to +85°C 8 Plastic DIP ±1 MAX5353BEPA MAX5353AEUA MAX5353BEUA -40°C to +85°C

-40°C to +85°C

-40°C to +85°C 8 Plastic DIP 8 µMAX 8 µMAX

±2 ±1 ±2

MAX5353BMJA -55°C to +125°C 8 CERDIP** ±4

MAX5353ACPA

0°C to +70°C 8 Plastic DIP ±1 MAX5353BCPA MAX5353ACUA MAX5353BCUA 0°C to +70°C

0°C to +70°C

0°C to +70°C 8 Plastic DIP

8 µMAX 8 µMAX

±2 ±1 ±2

PART*

MAX5352AEPA -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

8 Plastic DIP

INL

(LSB)

±1/2 MAX5352BEPA MAX5352AEUA MAX5352BEUA -40°C to +85°C

-40°C to +85°C

-40°C to +85°C 8 Plastic DIP 8 µMAX 8 µMAX

±1 ±1/2 ±1

MAX5352BMJA -55°C to +125°C 8 CERDIP** ±2

________________________________________________________Package Information

PDIPN.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.

__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600

MAX5352/MAX5353

Low-Power, 12-Bit Voltage-Output DACs with Serial Interface

___________________________________________Package Information (continued)

8LUMAXD.EPS

CDIPS.EPS

Rainbow Electronics MAX5353 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual