MAX520-MAX521 MAXIM [Maxim Integrated Products], MAX520-MAX521 Datasheet

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MAX520-MAX521

Manufacturer Part Number
MAX520-MAX521
Description
Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
The MAX520/MAX521 are quad/octal, 8-bit voltage-output
digital-to-analog converters (DACs) with simple 2-wire ser-
ial interfaces that allow communication between multiple
devices. They operate from a single +5V supply and their
reference input range includes both supply rails.
The MAX521 includes rail-to-rail output buffer amplifiers for
reduced system size and component count when driving
loads. The MAX520’s unbuffered voltage outputs reduce
the device’s total supply current to 4µA and provide
increased accuracy at low output currents.
The MAX520/MAX521 feature a serial interface and internal
software protocol, allowing communication at data rates up
to 400kbps. The interface, combined with the double-
buffered input configuration, allows the DAC registers to be
updated individually or simultaneously. In addition, the
devices can be put into a low-power shutdown mode that
reduces supply current to 4µA. Power-on reset ensures the
DAC outputs are at 0V when power is initially applied.
The MAX520 is available in 16-pin DIP and wide SO pack-
ages, as well as a space-saving 20-pin SSOP. The
MAX521 comes in 20-pin DIP and 24-pin SO packages, as
well as a space-saving 24-pin SSOP.
________________________Applications
19-0378; Rev 3; 9/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_________________Pin Configurations
_______________General Description
Pin Configurations continued at end of data sheet.
TOP VIEW
Minimum Component Analog Systems
Digital Offset/Gain Adjustment
Industrial Process Control
Automatic Test Equipment
Programmable Attenuators
DGND
AGND
OUT1
OUT0
REF1
REF0
SCL
SDA
________________________________________________________________ Maxim Integrated Products
1
3
4
5
6
7
8
2
MAX520
DIP/SO
Quad/Octal, 2-Wire Serial 8-Bit DACs
16
15
14
13
12
11
10
9
OUT2
OUT3
REF2
REF3
V
AD2
AD1
AD0
DD
with Rail-to-Rail Outputs
____________________________Features
_______________Functional Diagrams
Ordering Information continued at end of data sheet.
output resistance.
MAX520 “A” grade parts include a 1%-accurate, factory-trimmed
______________Ordering Information
MAX520ACPE
MAX520BCPE
MAX520ACWE
MAX520BCWE
Functional Diagrams continued at end of data sheet.
SDA
Single +5V Supply
Simple 2-Wire Serial Interface
I
Outputs Swing Rail to Rail:
1%-Accurate Trimmed Output Resistance (MAX520A)
Ultra-Low 4µA Supply Current (MAX520)
Individual DACs Have Separate Reference Inputs
Power-On Reset Clears All Latches
4µA Power-Down Mode
2
C Compatible
PART
Unbuffered Outputs (MAX520)
Buffered Outputs (MAX521)
SCL
COMPARATOR
SHIFT REGISTER
MAX520
AD0
ADDRESS
START/STOP
DETECTOR
8-BIT
DECODE
AD1
TEMP. RANGE
AD2
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
4
8
LATCH 1
LATCH 0
LATCH 3
LATCH 2
INPUT
1
1
INPUT
1
1
INPUT
INPUT
LATCH 0
LATCH 1
OUTPUT
OUTPUT
PIN-PACKAGE
LATCH 3
OUTPUT
LATCH 2
OUTPUT
16 Plastic DIP
16 Plastic DIP
16 Wide SO
16 Wide SO
REF2
REF1
DAC2
DAC3
DAC0
DAC1
REF3
REF0
OUT0
OUT1
OUT2
OUT3
(LSB)
TUE
1
1
1
1
1

Related parts for MAX520-MAX521

MAX520-MAX521 Summary of contents

Page 1

... Power-on reset ensures the DAC outputs are at 0V when power is initially applied. The MAX520 is available in 16-pin DIP and wide SO pack- ages, as well as a space-saving 20-pin SSOP. The MAX521 comes in 20-pin DIP and 24-pin SO packages, as well as a space-saving 24-pin SSOP ...

Page 2

... DD 20-Pin CERDIP (derate 11.11mW/°C above +70°C)....889mW Operating Temperature Ranges MAX520_C_ _/MAX521_C_ _ ..............................0°C to +70°C MAX520_E_ _/MAX521_E_ _ ...........................-40°C to +85°C MAX520_MJE/MAX521BMJP ........................-55°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C = 10kΩ (MAX521), C ...

Page 3

... DIGITAL INPUTS AD0, AD1 Input High Voltage Input Low Voltage Input Leakage DIGITAL OUTPUT SDA (Note 6) Output Low Voltage Three-State Leakage Current Three-State Output Capacitance _______________________________________________________________________________________ with Rail-to-Rail Outputs = 10kΩ (MAX521 0pF (MAX520 +25°C) A SYMBOL CONDITIONS MAX520_ Code = R 55 hex ...

Page 4

... C = 0pF (MAX520 +25°C) A SYMBOL CONDITIONS MAX521_C Positive and negative MAX521_E MAX521BM MAX520_, to 1/2LSB, no load MAX521_, to 1/2LSB, 10kΩ and 100pF load (Note 7) Code = 00 hex, all digital inputs from Code 128 to 127 V = 4Vp-p at 1kHz, V REF_ DD SINAD ...

Page 5

... SCL signal) in order to IL and 0. MAX520 REFERENCE VOLTAGE INPUT FREQUENCY RESPONSE 4Vp-p SINE WAVE REF -4 CENTERED AT 2. -10 -12 -14 -16 -18 120 150 1k 10k 100k FREQUENCY (Hz) ...

Page 6

... REF2 = 4V, DAC CODE = 7F HEX to 80 HEX 6 _______________________________________________________________________________________ OUT2 1V/div OUT2 = NO LOAD, REF2 = 4V, DAC CODE = FF HEX to 00 HEX WORST-CASE 1LSB DIGITAL STEP CHANGE (CAPACITIVE LOAD = 25pF) OUT2 20mV/div AC COUPLED REF2 = 4V, DAC CODE = 7F HEX to 80 HEX MAX520 NEGATIVE SETTLING TIME OUT2 1V/div 1 s/div MAX520 OUT2 20mV/div AC COUPLED 500ns/div ...

Page 7

Quad/Octal, 2-Wire Serial 8-Bit DACs __________________________________________Typical Operating Characteristics (V = 5V, DAC outputs unloaded MAX521 SUPPLY CURRENT vs. TEMPERATURE 5.5V DD ALL REF INPUTS = 0.6V 10 ALL DIGITAL INPUTS ALL ...

Page 8

Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs ______________________________Typical Operating Characteristics (continued 5V, DAC outputs unloaded +25°C, unless otherwise noted CLOCK FEEDTHROUGH A = SCL, 400kHz, 5V/div B = OUT1, 5mV/div REF1 = 5V, ...

Page 9

... Quad/Octal, 2-Wire Serial 8-Bit DACs ______________________________________________________________Pin Description PIN MAX520 DIP/SO SSOP — 14 — — — — — — — — — — SDA ...

Page 10

... SCL is high. The only exceptions to this are the START and STOP conditions. Data is transmit- ted in 8-bit bytes. Nine clock cycles are required to trans- fer the data bits to the MAX520/MAX521. Set SDA low during the 9th clock cycle as the MAX520/MAX521 pull SDA low during this time. R ...

Page 11

... In addition, the MAX521 has the next bit factory programmed to 0. The logic state of the address input pins (AD0, AD1, and AD2 of the MAX520; AD0 and AD1 of the MAX521) determine the least significant bits of the 7-bit slave address. These input pins may be connected ...

Page 12

Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs 0 OR AD2 AD1 AD0 0 0 SDA ADDRESS BYTE ACK START CONDITION SDA OUTPUT BYTE ACK (FULL SCALE) ( ...

Page 13

... I C application. Additional START Conditions It is possible to interrupt a transmission to a MAX520/ MAX521 with a new START (repeated start) condition (perhaps addressing another device), which leaves the input latches with data that has not been transferred to the output latches (Figure 12). Only the currently addressed device will recognize a STOP condition and transfer data to its output latches ...

Page 14

... MAX521’s DAC4–DAC7 all share a common reference input. Figure 14 shows a simplified diagram of one DAC. The MAX520/MAX521 can be used for multiplying appli- cations. The reference accepts both DC and AC signals. The voltage at each REF input sets the full-scale output voltage for its respective Analog Section DAC(s) ...

Page 15

... The REF input capacitance is also code dependent, with the maximum value occur- ring at code FF hex (typically 30pF for the MAX520/ MAX521’s REF0–REF3, and 120pF for the MAX521’s REF4). The output voltage for any DAC can be repre- ...

Page 16

... In addition, the MAX521’s output buffers are dis- abled, greatly reducing the supply current. The MAX520’s operating supply current does not change in shutdown mode. The Command Byte and Output Byte section describes how to enter and exit shutdown mode ...

Page 17

... Quad/Octal, 2-Wire Serial 8-Bit DACs ___________________________________________________Pin Configurations (continued) TOP VIEW OUT1 1 20 OUT0 2 19 REF1 MAX520 REF0 5 16 AGND DGND 13 8 SCL 12 9 SDA 10 11 SSOP ________________________________________________Functional Diagrams (continued) SDA ______________________________________________________________________________________ with Rail-to-Rail Outputs OUT2 OUT1 ...

Page 18

... SSOP MAX521BEAG -40°C to +85°C 24 SSOP MAX521BMJP -55°C to +125°C 20 CERDIP * Dice are specified +25°C, DC parameters only. A † MAX520 “A” grade parts include a 1%-accurate, factory-trimmed output resistance. 18 ______________________________________________________________________________________ _________________Chip Topographies MAX520 TUE (LSB) DGND ...

Page 19

Quad/Octal, 2-Wire Serial 8-Bit DACs ________________________________________________________Package Information ______________________________________________________________________________________ with Rail-to-Rail Outputs 0° - 15° Plastic DIP PLASTIC DUAL-IN-LINE PACKAGE (0.300 ...

Page 20

Quad/Octal, 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs ___________________________________________Package Information (continued Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are ...

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