DS4422 MAXIM | Alldatasheet
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Technical content
Features
♦ Two (DS4422) or Four (DS4424) Current DACs ♦ Full-Scale Current 50µA to 200µA ♦ Full-Scale Range for Each DAC Determined by External Resistors ♦ 127 Settings Each for Sink and Source Modes ♦ I2C-Compatible Serial Interface ♦ Two Address Pins Allow Four Devices on Same I2C Bus ♦ Low Cost ♦ Small Package (14-Pin, 3mm x 3mm TDFN) ♦ -40°C to +85°C Temperature Range ♦ 2.7V to 5.5V Operating Range DS4422/DS4424 Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC DC-DC CONVERTER FB OUT SDA SCL A1 OUT0 OUT1 GND RFS0 RFS1 RPURPU VCC VCC VOUT0 FS0 FS1 R0B R0A DC-DC CONVERTER FB OUT VOUT1 R1B R1A DS4422/ DS4424 Typical Operating Circuit
Ordering Information
Rev 0; 3/08 +Denotes a lead-free package. T&R = Tape and reel. PART OUTPUTS TEMP RANGE PIN- PACKAGE DS4422N+ 2 -40°C to +85°C 14 TDFN DS4422N+T&R 2 -40°C to +85°C 14 TDFN DS4424N+ 4 -40°C to +85°C 14 TDFN DS4424N+T&R 4 -40°C to +85°C 14 TDFN Pin Configuration appears at end of data sheet.
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC ABSOLUTE MAXIMUM RATINGS RECOMMENDED OPERATING CONDITIONS (TA = -40°C to +85°C.) 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 specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Voltage Range on VCC, SDA, and SCL Voltage Range on A0, A1, FS0, FS1, FS2, FS3, OUT0, OUT1, OUT2, and OUT3 Relative to CC + 0.5V) (Not to exceed 6.0V.) J-STD-020 Specification. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V CC (Note 1) 2.7 5.5 V Input Logic 1 (SDA, SCL, A0, A1) V IH 0.7 x V CC V CC + 0.3 V Input Logic 0 (SDA, SCL, A0, A1) V IL -0.3 0.3 x V CC V Full-Scale Resistor Values RFS0, RFS1, RFS2, RFS3 (Note 2) 40 160 k DC ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +5.5V, TA = -40°C to +85°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DS4422 250 Supply Current I CC VCC = 5.5V (Note 3) DS4424 250 μA Input Leakage (SDA, SCL) I IL V CC = 5.5V 1 μA Output Leakage (SDA) I L 1 μA VOL = 0.4V 3 Output Current Low (SDA) I OL VOL = 0.6V 6 mA RFS Voltage V RFS 0.976 V I/O Capacitance C I/O 10 pF OUTPUT CURRENT SOURCE CHARACTERISTICS (VCC = +2.7V to +5.5V, TA = -40°C to +85°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage for Sinking Current V OUT:SINK (Note 4) 0.5 3.5 V Output Voltage for Sourcing Current VOUT:SOURCE (Note 4) 0 VCC - 0.75 V Full-Scale Sink Output Current I OUT:SINK (Notes 1, 4) 50 200 μA Full-Scale Source Output Current I OUT:SOURCE (Notes 1, 4) -200 -50 μA Output Current Full-Scale Accuracy IOUT:FS +25°C, VCC = 3.3V; using 0.1% R FS resistor (Note 2), V OUT0 = VOUT1 = 1.2V ±6 % Output Current Temperature Coefficient IOUT:TC (Note 5) ±75 ppm/°C
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC Note 1: All voltages with respect to ground. Currents entering the IC are specified positive, and currents exiting the IC are negative. Note 2: Input resistors (RFS) must be between the speciifed values to ensure the device meets its accuracy and linearity specifications. Note 3: Supply current specified with all outputs set to zero current setting. A0 and A1 are connected to GND. SDA and SCL are con- nected to VCC. Excludes current through RFS resistors (IRFS). Total current including IRFS is ICC + (2 x IRFS). Note 4: The output-voltage range must be satisfied to ensure the device meets its accuracy and linearity specifications. Note 5: Temperature drift excludes drift caused by external resistor. Note 6: Differential linearity is defined as the difference between the expected incremental current increase with respect to position and the actual increase. The expected incremental increase is the full-scale range divided by 127. Note 7: Guaranteed by design. Note 8: Integral linearity is defined as the difference between the expected value as a function of the setting and the actual value. The expected value is a straight line between the zero and the full-scale values proportional to the setting. Note 9: Timing shown is for fast-mode (400kHz) operation. This device is also backward compatible with I2C standard-mode timing. Note 10: CB—total capacitance of one bus line in pF. OUTPUT CURRENT SOURCE CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V, TA = -40°C to +85°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC source 0.32 Output Current Variation Due to Power-Supply Change DC sink 0.42 %/V DC source, VOUT measure at 1.2V 0.16 Output Current Variation Due to Output-Voltage Change DC sink, V OUT measure at 1.2V 0.16 %/V Output Leakage Current at Zero Current Setting IZERO -1 +1 μA Output Current Differential Linearity DNL (Notes 6, 7) -0.5 +0.5 LSB Output Current Integral Linearity INL (Notes 7, 8) -1 +1 LSB AC ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +5.5V, TA = -40°C to +85°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SCL Clock Frequency f SCL (Note 9) 0 400 kHz Bus Free Time Between STOP and START Conditions tBUF 1.3 μs Hold Time (Repeated) START Condition tHD:STA 0.6 μs Low Period of SCL t LOW 1.3 μs High Period of SCL t HIGH 0.6 μs Data Hold Time t DH:DAT 0 0.9 μs Data Setup Time t SU:DAT 100 ns START Setup Time t SU:STA 0.6 μs SDA and SCL Rise Time t R (Note 10) 20 + 0.1C B 300 ns SDA and SCL Fall Time t F (Note 10) 20 + 0.1C B 300 ns STOP Setup Time t SU:STO 0.6 μs SDA and SCL Capacitive Loading CB (Note 10) 400 pF
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE DS4422/4 toc01 SUPPLY VOLTAGE (V) SUPPLY CURRENT (μA) 100 150 200 250 2.5 5.5 DOES NOT INCLUDE CURRENT DRAWN BY RESISTORS CONNECTED TO FS0, FS1, FS2, OR FS3 SUPPLY CURRENT vs. TEMPERATURE DS4422/4 toc02 TEMPERATURE (°C) SUPPLY CURRENT (μA) 806040200-20 100 150 200 250 -40 VCC = 5.0V VCC = 2.7V VCC = 3.3V DOES NOT INCLUDE CURRENT DRAWN BY RESISTORS CONNECTED TO FS0, FS1, FS2, OR FS3 VOLTCO (SOURCE) DS4422/4 toc03 VOUT (V) IOUT (μA) -225 -200 -175 -150 -250 0 5.0 40kΩ LOAD ON FS0, FS1, FS2, AND FS3 VOLTCO (SINK) DS4422/4 toc04 VOUT (V) IOUT (μA) 175 200 225 250 150 0 4.0 40kΩ LOAD ON FS0, FS1, FS2, AND FS3 TEMPERATURE COEFFICIENT vs. SETTING (SOURCE) DS4422/4 toc05 SETTING (DEC) TEMPERATURE COEFFICIENT (°C/ppm) 125100755025 -50 100 150 200 -100 +25°C TO -40°C +25°C TO +85°C FOR THE 50μA TO 200μA CURRENT SOURCE RANGE TEMPERATURE COEFFICIENT vs. SETTING (SINK) DS4422/4 toc06 SETTING (DEC) TEMPERATURE COEFFICIENT (°C/ppm) 125100755025 -200 -150 -100 -50 -250 +25°C TO -40°C +25°C TO +85°C FOR THE 50μA TO 200μA CURRENT SINK RANGE INTEGRAL LINEARITY DS4422/4 toc07 SETTING (DEC) INL (LSB) 12510025 50 75 -0.75 -0.50 -0.25 0.25 0.50 0.75 1.00 -1.00 FOR THE 50μA TO 200μA CURRENT SOURCE AND SINK RANGE DIFFERENTIAL LINEARITY DS4422/4 toc08 SETTING (DEC) DNL (LSB) 125100755025 -0.8 -0.6 -0.4 -0.2 0.2 0.4 0.6 0.8 1.0 -1.0 FOR THE 50μA TO 200μA CURRENT SOURCE AND SINK RANGE
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC VCC VCC RFS0 RFS1 RFS2 RFS3 SDA SCL A1 A0 GND FS0 FS1 OUT1OUT0 CURRENT DAC0 F8h F9h SOURCE OR SINK MODE FS2 OUT2 FS3 OUT3 CURRENT DAC3
127 POSITIONS
SERIAL INTERFACE DS4422/DS4424 DS4424 ONLY Block Diagram PIN DS4424 DS4422 NAME FUNCTION 1 1 SDA I 2C Serial Data. Input/output for I 2C data. 2 2 SCL I 2C Serial Clock. Input for I 2C clock. 3 3 GND Ground 4 — FS3 5 — FS2 6 6 FS1 7 7 FS0 Full-Scale Calibration Input. A resistor to ground on these pins determines the full-scale current for each output. FS0 controls OUT0, FS1 controls OUT1, etc. (The DS4422 has only two inputs: FS0 and FS1.) 8 8 OUT0 10 10 OUT1 12 — OUT2 14 — OUT3 Current Output. Sinks or sources the current determined by the I 2C interface and the resistance connected to FSx. (The DS4422 has only two outputs: OUT0 and OUT1.) 9, 11 9, 11 A0, A1 Address Select Inputs. Determines the I 2C slave address by connecting V CC or GND. See the Detailed Description section for the available device addresses. 13 13 V CC Power Supply — 4, 5, 12, 14 N.C. No Connection — — EP Exposed Pad. Leave floating or connect to GND. Pin Description
table), and RFS is the external resistor value. memory addresses), use equation 2. On power-up the DS4422/DS4424 output zero current. troller has had a chance to modify the device’s setting. the most out of its 7-bit sink or source resolution. supply can be controlled or margined. determined by the address input combinations. to the memory addresses listed in Table 2.
1 IOUT FS=× AC Value dec()
16 IFS RFS
Table 1. Slave Addresses Table 2. Memory Addresses of the state of the sign bit.
a value of 0xAAh. Calculate the output current. clock pulses and START and STOP conditions. ates a low-power mode for slave devices. the master to initiate a new data transfer with a slave. a STOP condition. See Figure 1 for applicable timing. START condition. See Figure 1 for applicable timing. shifted into the device during the rising edge of the SCL. is valid at the rising edge of the current SCL pulse. es, including when it is reading bits from the slave. Figure 1. I2C Timing Diagram NOTE: TIMING IS REFERENCED TO VIL(MAX) AND VIH(MIN).
device is not receiving data. acknowledgement is read using the bit-read definition. the addresses corresponding to the state of A0 and A1. communication until the next START condition is sent. memory location where the slave is to store the data. Figure 2. I2C Communication Examples *THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PINS A0 AND A1.
*VOUT AND VFB VALUES ARE DETERMINED BY THE DC-DC CONVERTER AND SHOULD NOT BE CONFUSED WITH VOUT AND VRFS OF THE DS4422/DS4424. Figure 3. Example Application Circuit
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Package Information
For the latest package outline information, go to www.maxim-ic.com/packages.TOP VIEW VCC OUT1 SCL FS3 (N.C.) FS2 (N.C.) ( ) INDICATES DS4422 ONLY. *EXPOSED PAD *EP + 14 OUT3 (N.C.) OUT2 (N.C.) SDA 3 12GND 6 9 A0FS1 7 8 OUT0FS0 DS4422/ DS4424 Pin Configuration PACKAGE TYPE PACKAGE CODE DOCUMENT NO.